Sealing ring structure of back-to-back impeller

Abstract

The utility model belongs to the field of feeding pumps, and provides a sealing ring structure with back-to-back impellers, which comprises a pump body, a main shaft, an impeller group, a shaft sleeve and a bushing. Wherein the main shaft is rotationally mounted in the pump body; the impeller set comprises clockwise impellers and anticlockwise impellers which are connected to the main shaft in a spaced mode. The shaft sleeve is connected to the main shaft in a sealed mode and located between the clockwise impeller and the anticlockwise impeller. The lining is connected to the pump body in a sealed mode and is coaxial with the shaft sleeve. The surface, close to one side of the lining, of the shaft sleeve sinks to form an arc-shaped groove axially perpendicular to the main shaft.

Description

Technical Field

[0001] This application belongs to the field of feed pumps, and particularly relates to a seal ring structure with impellers arranged back-to-back. Background Art

[0002] After the residue oil hydrogenation feed pump for the slurry bed device has been continuously used for a period of time, a series of problems will occur. The main problem lies in the abnormal wear of the seal ring, which causes the gap of the seal ring to gradually increase, thereby affecting the efficiency of the impeller and making it unable to reach the predetermined standard. In addition, due to the decline in sealing performance, it may also cause the motor to operate with overcurrent, which not only increases energy consumption but also may have an adverse impact on the service life of the motor. Therefore, it is necessary to solve the above technical problems. Summary of the Invention

[0003] The purpose of the embodiment of this application is to provide a seal ring structure with impellers arranged back-to-back to solve the technical problem of poor sealing performance of the seal ring in the prior art.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a seal ring structure with impellers arranged back-to-back, including:

[0005] A pump body;

[0006] A main shaft, rotatably installed inside the pump body;

[0007] An impeller group, including a clockwise impeller and a counterclockwise impeller connected to the main shaft at intervals;

[0008] A shaft sleeve, sealingly connected to the main shaft and located between the clockwise impeller and the counterclockwise impeller;

[0009] A bushing, sealingly connected to the pump body and coaxially arranged with the shaft sleeve. An arc-shaped groove perpendicular to the main shaft in the axial direction is formed by the depression on the surface of the shaft sleeve close to the bushing side;

[0010] The shaft sleeve includes an annular side wall parallel to the main shaft and a boss perpendicular to the annular side wall;

[0011] The bosses are arranged at intervals along the axial direction of the annular side wall, and the bushing is located between adjacent bosses;

[0012] One of the arc-shaped grooves close to the counterclockwise impeller is tangent to the corresponding boss and radially indents into the solid surface of the annular side wall, and one of the arc-shaped grooves close to the clockwise impeller is tangent to the solid surface of the annular side wall and axially indents into the corresponding boss along the axis direction of the annular side wall.

[0013] Optionally, the arc-shaped groove is arranged at the included angle between the boss and the annular side wall.

[0014] Optionally, the blade helix directions of the clockwise impeller and the counterclockwise impeller are opposite, and they are arranged back to back in the axial direction of the main shaft.

[0015] Optionally, the sleeve shares the same connection key with the clockwise impeller to be connected to the main shaft.

[0016] Optionally, the sleeve forms a step on the end face close to the clockwise impeller, and the hub end face of the clockwise impeller close to the sleeve forms a shape adapted to the step and nests with the step.

[0017] Optionally, the bushing includes at least two detachably connected parts.

[0018] Optionally, the sleeve is hot-fitted onto the main shaft with an interference fit.

[0019] Optionally, the impeller group further includes a snap ring sleeved on the main shaft and used to limit the axial movement of the clockwise impeller and the counterclockwise impeller along the main shaft.

[0020] The beneficial effect of the seal ring structure of the back-to-back arranged impellers provided in this application is as follows: Compared with the prior art, in the seal ring structure of the back-to-back arranged impellers in this application, since an arc-shaped groove perpendicular to the main shaft in the axial direction is recessed on one side surface of the sleeve close to the bushing, strong eddy currents will be generated in the arc-shaped groove when the high-pressure liquid between the clockwise impeller and the counterclockwise impeller passes through the gap between the sleeve and the bushing. In this way, it can effectively prevent the high-pressure liquid from leaking through the gap between the sleeve and the bushing and reduce the leakage loss, which is beneficial to significantly improving the impeller efficiency and is far superior to the prior art. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is the overall structure sectional view of the seal ring structure of the back-to-back arranged impellers in the embodiment of this application;

[0023] Figure 2 It is the sectional structure schematic diagram of the sleeve structure in the embodiment of this application;

[0024] Figure 3 It is the front view structure schematic diagram of the sleeve structure in the embodiment of this application;

[0025] Figure 4This is the front view structural schematic diagram of the bushing structure in the embodiment of the present application;

[0026] Figure 5 This is the sectional structural schematic diagram of the bushing structure in the embodiment of the present application.

[0027] Among them, the reference numerals in the figure are as follows: 101, pump body; 102, main shaft; 103, clockwise impeller; 104, counterclockwise impeller; 105, shaft sleeve; 106, bushing; 107, snap ring; 151, arc-shaped groove; 152, annular side wall; 153, boss; 154, step. Specific embodiments

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, 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, and therefore should not be construed as a limitation to the present application.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0032] Please refer to Figures 1 to 5 together, and now a seal ring structure for impellers arranged back-to-back provided by the embodiment of the present application will be described. The seal ring structure for impellers arranged back-to-back includes a pump body 101, a main shaft 102, an impeller group, a shaft sleeve 105, and a bushing 106. Among them:

[0033] The main shaft 102 is rotatably installed inside the pump body 101; the impeller group includes a clockwise impeller 103 and a counterclockwise impeller 104 that are spaced and connected to the main shaft 102; the shaft sleeve 105 is sealingly connected to the main shaft 102 and is located between the clockwise impeller 103 and the counterclockwise impeller 104; the bushing 106 is sealingly connected to the pump body 101 and is coaxially arranged with the shaft sleeve 105, and an arc-shaped groove 151 perpendicular to the main shaft 102 in the axial direction is formed by the depression on the surface of the shaft sleeve 105 close to the bushing 106.

[0034] In the above structure provided by this application, please refer to Figures 1 to 5 , the shaft sleeve 105 includes an annular side wall 152 parallel to the main shaft 102 and a boss 153 perpendicular to the annular side wall 152; the bosses 153 are arranged at intervals along the axial direction of the annular side wall 152, and the bushing 106 is located between adjacent bosses 153; an arc-shaped groove 151 close to the counterclockwise impeller 104 is tangent to the corresponding boss 153 and radially recesses into the solid surface of the annular side wall 152, and an arc-shaped groove 151 close to the clockwise impeller 103 is tangent to the solid surface of the annular side wall 152 and recesses into the corresponding boss 153 along the axis direction of the annular side wall 152. It can be understood that both arc-shaped grooves 151 surround one week in the circumferential direction of the shaft sleeve 105.

[0035] According to the above structure provided in this embodiment, in the seal ring structure with back-to-back arranged impellers in this embodiment, since an arc-shaped groove 151 perpendicular to the main shaft 102 in the axial direction is formed by the depression on the surface of the shaft sleeve 105 close to the bushing 106, the high-pressure liquid between the clockwise impeller 103 and the counterclockwise impeller 104 will generate a strong vortex in the arc-shaped groove 151 during the process of passing through the gap between the shaft sleeve 105 and the bushing 106 ( Figure 1 as shown by the arrow in), and the vortex generates a reaction force in the direction opposite to the leakage flow direction of the high-pressure liquid, preventing the flow of the high-pressure liquid. Under the action of the two arc-shaped grooves 151, the leakage of the high-pressure liquid from the gap between the shaft sleeve 105 and the bushing 106 can be effectively prevented and the leakage loss can be reduced, which is beneficial to significantly improving the impeller efficiency and is far superior to the prior art.

[0036] The bushing 106 arranged between the bosses 153 can cooperate with the shaft sleeve 105 to form a gap with a relatively tortuous path, so that the high-pressure liquid is more difficult to leak from the gap between the shaft sleeve 105 and the bushing 106, which is beneficial to further improving the sealing performance of the seal ring structure with back-to-back arranged impellers in this embodiment and further improving the impeller efficiency.

[0037] In the above structure provided by this application, please refer to Figures 1 to 5, the arc-shaped groove 151 is provided at the included angle between the boss 153 and the annular side wall 152. According to the above structure provided in this embodiment, the arc-shaped groove 151 provided at the included angle between the boss 153 and the annular side wall 152 can make the high-pressure liquid generate a larger eddy current, which is beneficial to further improving the sealing performance of the seal ring structure of the back-to-back arranged impellers in this embodiment and further improving the impeller efficiency.

[0038] In the above structure provided by this application, please refer to Figures 1 to 5 , the blade rotation directions of the clockwise impeller 103 and the counterclockwise impeller 104 are opposite and they are arranged back-to-back in the axial direction of the main shaft 102. According to the above structure provided in this embodiment, the blade rotation directions of the clockwise impeller 103 and the counterclockwise impeller 104 are opposite and form a back-to-back arrangement. This arrangement effectively balances the axial force of the main shaft 102 and can prevent the main shaft 102 from axially moving along its own axis, which is beneficial to further improving the sealing performance of the seal ring structure of the back-to-back arranged impellers in this embodiment and can improve the operating stability of the pump.

[0039] In the above structure provided by this application, please refer to Figures 1 to 5 , the shaft sleeve 105 shares the same connection key with the clockwise impeller 103 to be connected to the main shaft 102. According to the above structure provided in this embodiment, under the action of the high-pressure liquid between the counterclockwise impeller 104 and the clockwise impeller 103, the end face of the shaft sleeve 105 can tightly abut against the hub end face of the clockwise impeller 103 to achieve sealing. In this way, it can effectively prevent the medium with corrosive particles from entering between the clockwise impeller 103 and the main shaft 102 and is convenient for disassembling the clockwise impeller 103, which is beneficial to significantly reducing the maintenance cost of the clockwise impeller 103.

[0040] In the above structure provided by this application, please refer to Figures 1 to 5 , the shaft sleeve 105 forms a step 154 on the end face close to the clockwise impeller 103, and the hub end face of the clockwise impeller 103 close to the shaft sleeve 105 forms a shape adapted to the step 154 and nests with the step 154. According to the above structure provided in this embodiment, the step 154 formed on the surface of the shaft sleeve 105 on the side close to the clockwise impeller 103 can further prevent impurities from entering between the clockwise impeller 103 and the main shaft 102, which is beneficial to further reducing the maintenance cost of the clockwise impeller 103.

[0041] In the above structure provided by this application, please refer to Figures 1 to 5, the bushing 106 includes at least two detachably connected parts. According to the above structure provided in this embodiment, the bushing 106 can be more conveniently installed and disassembled, which is beneficial to significantly reducing the maintenance cost of the seal ring structure of the back-to-back arranged impellers in this embodiment. It can be understood that the two parts of the bushing 106 can be fixed by the commonly used socket head cap screws in the art, which will not be elaborated here.

[0042] In the above structure provided by this application, please refer to Figures 1 to 5 , the sleeve 105 is press-fitted onto the main shaft 102 by hot fitting. According to the above structure provided in this embodiment, the sleeve 105 is fixed to the main shaft 102 by hot press-fitting, which can effectively prevent corrosive particulate media from entering between the sleeve 105 and the main shaft 102. In this way, it is further convenient to disassemble the sleeve 105, which is beneficial to further reducing the maintenance cost of the seal ring structure of the back-to-back arranged impellers in this embodiment and extending its service life.

[0043] In another embodiment provided by this application, please refer to Figures 1 to 5 , the impeller group further includes a snap ring 107 sleeved on the main shaft 102 and used to limit the axial movement of the clockwise impeller 103 and the counterclockwise impeller 104 along the main shaft 102. According to the above structure provided in this embodiment, the snap ring 107 sleeved on the main shaft 102 can effectively prevent the clockwise impeller 103 and the counterclockwise impeller 104 from axially moving along the main shaft 102, which is beneficial to further improving the sealing performance of the seal ring structure of the back-to-back arranged impellers in this embodiment and can improve the operating stability of the pump.

[0044] The above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A seal ring structure for impellers arranged back-to-back, characterized in that, Comprising: A pump body (101); A main shaft (102), rotatably installed inside the pump body (101); An impeller group, including a clockwise impeller (103) and a counterclockwise impeller (104) connected at intervals on the main shaft (102); A shaft sleeve (105), sealingly connected to the main shaft (102) and located between the clockwise impeller (103) and the counterclockwise impeller (104); A bushing (106), sealingly connected to the pump body (101) and coaxially arranged with the shaft sleeve (105). An arc-shaped groove (151) with an axis perpendicular to the main shaft (102) is formed by the depression on the surface of the shaft sleeve (105) close to the bushing (106); The shaft sleeve (105) includes an annular side wall (152) parallel to the main shaft (102) and a boss (153) perpendicular to the annular side wall (152); The bosses (153) are arranged at intervals along the axial direction of the annular side wall (152), and the bushing (106) is located between adjacent bosses (153); One of the arc-shaped grooves (151) close to the counterclockwise impeller (104) is tangent to the corresponding boss (153) and recessed radially towards the annular side wall (152) into the solid surface of the annular side wall (152). One of the arc-shaped grooves (151) close to the clockwise impeller (103) is tangent to the solid surface of the annular side wall (152) and recessed along the axis direction of the annular side wall (152) into the corresponding boss (153).

2. The seal ring structure with back-to-back arranged impellers according to claim 1, characterized in that: The arc-shaped groove (151) is arranged at the included angle between the boss (153) and the annular side wall (152).

3. The seal ring structure with back-to-back arranged impellers according to claim 1, characterized in that: The blade rotation directions of the clockwise impeller (103) and the counterclockwise impeller (104) are opposite and they are arranged back-to-back in the axial direction of the main shaft (102).

4. The seal ring structure with back-to-back arranged impellers according to claim 3, characterized in that: The shaft sleeve (105) shares the same connection key with the clockwise impeller (103) to be connected to the main shaft (102).

5. The seal ring structure with back-to-back arranged impellers according to claim 4, characterized in that: The shaft sleeve (105) forms a step (154) on the end face close to the clockwise impeller (103). The hub end face of the clockwise impeller (103) close to the shaft sleeve (105) forms a shape adapted to the step (154) and nests with the step (154).

6. The seal ring structure with back-to-back arranged impellers according to claim 1, characterized in that: The bushing (106) includes at least two detachable parts.

7. The seal ring structure with back-to-back arranged impellers according to claim 1, characterized in that: The shaft sleeve (105) is hot-fitted onto the main shaft (102) with an interference fit.

8. The seal ring structure with back-to-back arranged impellers according to claim 1, characterized in that: The impeller group further includes a snap ring (107) sleeved on the main shaft (102) and used to limit the clockwise impeller (103) and the counterclockwise impeller (104) from moving axially along the main shaft (102).

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