Admixture booster pump

Abstract

The utility model relates to the technical field of booster pump, especially to additive booster pump, including stainless steel impeller shaft installed in the pump body output end, the impeller shaft is equipped with the dynamic ring, the pump body end cover inner wall is equipped with the static ring with dynamic ring opposite setting, the impeller shaft still is equipped with the elastic element abutting to the side of dynamic ring away from static ring to provide sealed pressure, still include anticorrosive assembly in the upstream end of dynamic ring and static ring contact surface, the anticorrosive assembly includes liquid baffle piece and spring guard spare, the liquid baffle piece is annular structure and sets up in the impeller shaft, the utility model discloses a U type sealing washer blocks the penetration of additive and contained solid particles in the pump body to the elastic element area, avoids the abrasion intensification of dynamic ring and static ring contact surface because of scouring, and at the same time, spring guard spare adopts telescopic tubular structure and sets up in the outside of elastic element and keeps clearance fit, not only influences the normal telescoping of elastic element to guarantee sealed pressure stability, but also can form the protection to elastic element.

Description

Technical Field

[0001] This utility model relates to the field of booster pump technology, and in particular to an additive booster pump. Background Technology

[0002] In the cement production process, cement admixtures, as key auxiliary materials for improving concrete performance, need to be continuously and stably transported from storage tanks to mixers via booster pumps. Cement admixtures are mostly acidic or contain chloride ions, which are highly corrosive, and they need to withstand working pressure during transportation. This places extremely high demands on the corrosion resistance, sealing performance, and operational stability of the mechanical seal of the booster pump.

[0003] Mechanical seals, as key shaft sealing devices in rotating machinery, function by having a rotating ring that rotates with the impeller shaft seal against a stationary ring fixed to the pump body end cover. This, combined with the pre-tightening force provided by an elastic element, prevents corrosive media from leaking out of the pump and avoids external impurities from entering the pump chamber. However, cement admixtures often contain trace amounts of solid particles. During pump operation, these particles can erode the clearance between the rotating ring and the impeller shaft as the media flows. This not only accelerates the wear of the auxiliary seals inside the rotating ring but also causes the media to breach the auxiliary seals and penetrate into the elastic element area, eventually leading to poor sealing.

[0004] Based on the above situation, we propose an additive booster pump to solve the above problems. Utility Model Content

[0005] This invention provides an admixture booster pump to solve the problem of poor sealing caused by long-term corrosion of sealing components by cement admixtures in the prior art.

[0006] The technical problem solved by this utility model is achieved by the following technical solution:

[0007] An admixture booster pump includes a stainless steel impeller shaft installed at the output end of the pump body. A rotating ring is mounted on the impeller shaft. A stationary ring is provided on the inner wall of the pump body end cover, opposite to the rotating ring. An elastic element is also provided on the impeller shaft, abutting against the side of the rotating ring away from the stationary ring to provide sealing pressure. The pump body also includes an anti-corrosion component located upstream of the contact surface between the rotating ring and the stationary ring. The anti-corrosion component includes a liquid-blocking component and a protective spring component. The liquid-blocking component is an annular structure and is sleeved on the impeller shaft. The inner side wall of the liquid-blocking component is sealed and fitted with the impeller shaft, and the outer side wall is sealed and fitted with the inner wall of the pump body end cover. The protective spring component is a telescopic tubular structure, sleeved on the outside of the elastic element and maintaining a clearance fit with the elastic element.

[0008] Preferably, the liquid-blocking component includes a connecting ring integrally formed with the impeller shaft and a U-shaped sealing ring disposed on the connecting ring. The U-shaped sealing ring is made of fluororubber and its opening faces the side of the pump body containing the additive.

[0009] Preferably, an abutment ring is connected to the inner wall of the pump body end cover, and a shallow groove is formed on the inner circumference of the abutment ring, corresponding to the lip edge of the U-shaped sealing ring on the side away from the connecting ring.

[0010] Preferably, the impeller shaft has an annular protrusion on its annular protrusion, and the annular protrusion abuts against the closed end of the U-shaped sealing ring.

[0011] Preferably, the spring guard is a corrugated hose with a wear-resistant coating on its surface, and both ends of the spring guard are connected to the annular protrusions of the rotating ring and the impeller shaft, respectively.

[0012] Preferably, the elastic element is a stainless steel spring, and the surface of the elastic element is provided with a galvanized anti-corrosion layer.

[0013] The beneficial effects of this utility model are as follows: the U-shaped sealing ring prevents the additives and solid particles contained in the pump body from penetrating into the elastic element area, thus avoiding increased wear on the contact surface between the dynamic ring and the stationary ring due to scouring. At the same time, the protective spring adopts a telescopic tubular structure and is sleeved on the outside of the elastic element while maintaining a clearance fit. This not only does not affect the normal expansion and contraction of the elastic element to ensure stable sealing pressure, but also provides protection for the elastic element. Combined with the galvanized anti-corrosion layer on the surface of the elastic element, it further enhances the corrosion resistance of the elastic element. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the isometric structure provided by this utility model;

[0016] Figure 2 Schematic diagram of the cross-sectional structure provided by this utility model Figure 1 ;

[0017] Figure 3 Schematic diagram of the cross-sectional structure provided by this utility model Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the structure of the spring guard in this utility model.

[0019] In the diagram, 1 is the pump body; 11 is the contact ring; 12 is the shallow groove; 2 is the impeller shaft; 3 is the moving ring; 4 is the stationary ring; 5 is the elastic element; 6 is the liquid baffle; 61 is the connecting ring; 62 is the U-shaped sealing ring; 7 is the protective spring; and 8 is the annular boss. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0021] Reference Figures 1-4 As shown, the additive booster pump includes a stainless steel impeller shaft 2 installed at the output end of the pump body 1. A rotating ring 3 is installed on the impeller shaft 2. A stationary ring 4 is provided on the inner wall of the pump body 1 end cover, which is opposite to the rotating ring 3. An elastic element 5 is also provided on the impeller shaft 2, which abuts against the side of the rotating ring 3 away from the stationary ring 4 to provide sealing pressure. The impeller shaft 2 is made of 304 stainless steel, which has both strength and basic corrosion resistance, reducing the corrosion of the cement additive on the impeller shaft 2. An annular protrusion is machined on the impeller shaft 2, which can be integrally formed with the impeller shaft 2. The annular protrusion has a receiving cavity for accommodating the elastic element 5. The elastic element 5 is used to provide continuous sealing pressure for the rotating ring 3, ensuring that the sealing surfaces of the rotating ring 3 and the stationary ring 4 are tightly fitted. This solution mainly addresses the problems of traditional booster pump mechanical seals being easily eroded by the medium and the elastic element 5 being easily corroded and failed. The improvement lies in setting up anti-corrosion components, which, through cooperation with the original shaft seal components, achieve a long-term stable sealing effect.

[0022] Specifically, the anti-corrosion components include a liquid-blocking component 6 and a protective spring component 7. The liquid-blocking component is designed as a ring structure and is fitted onto the impeller shaft 2. Its inner wall is sealed to the impeller shaft 2, and its outer wall is sealed to the inner wall of the pump body 1 end cover. To further improve the structural stability and sealing reliability of the liquid-blocking component 6, it specifically includes a connecting ring 61 and a U-shaped sealing ring 62. The connecting ring 61 is integrally formed with the impeller shaft 2 and is made of the same 304 stainless steel material as the impeller shaft 2. This ensures the connection strength and avoids the gap leakage problem that may occur in a split structure. The U-shaped sealing ring 62 is made of fluororubber and has a "U"-shaped cross-section with the opening facing the admixture side inside the pump body 1. When cement admixtures or other media enter the U-shaped sealing ring 62, it will intercept the admixture on the one hand and push the U-shaped sealing ring on the other hand. The lip of the sealing ring 62 expands outward, and an abutment ring 11 is connected to the inner wall of the pump body 1 end cover. A shallow groove 12 is opened on the inner circumference of the abutment ring 11, which corresponds to the lip of the U-shaped sealing ring 62 away from the connecting ring 61. There is a certain gap between the lip of the U-shaped sealing ring 62 away from the connecting ring 61 and the shallow groove 12, such as 0.2-0.5mm. When the moving ring 3 rotates with the U-shaped sealing ring 62, some additive will run into this gap. Due to the rotation, the additive will form a layer similar to a "water film" in this gap, just like when the spin dryer is spinning, water forms a water film on the barrel wall and does not leak. This can both lubricate and prevent the U-shaped sealing ring 62 and the abutment ring 11 from directly rubbing, and also prevent the additive liquid from leaking through, so as to prevent the additive and its solid particles from penetrating into the contact area between the moving ring 3 and the stationary ring 4.

[0023] Reference Figure 3 As shown, furthermore, in order to limit the axial displacement of the U-shaped sealing ring 62 and prevent it from moving under the scouring of the additive, an annular boss 8 is integrally formed on the impeller shaft 2. The annular boss 8 abuts against the closed end of the U-shaped sealing ring and limits the U-shaped sealing ring 62. This prevents the U-shaped sealing ring 62 from being compressed and deformed by a large amplitude when the additive enters the interior of the U-shaped sealing ring 62 at the open end, causing the lip to detach from the shallow groove 12.

[0024] Reference Figure 4As shown, the spring guard 7 is further designed as a telescopic tubular structure, sleeved on the outside of the elastic element 5 and maintaining a clearance fit with the elastic element 5, so as not to affect the normal expansion and contraction of the elastic element 5. In order to further adapt to the expansion and contraction characteristics of the elastic element 5 and improve the durability of the spring guard 7, the spring guard 7 can be a corrugated hose with a wear-resistant layer sprayed on the surface. The wear-resistant layer is made of polytetrafluoroethylene and the thickness is controlled at 0.05-0.1mm. This can reduce the frictional loss between the spring guard 7 and the elastic element 5 and enhance the corrosion resistance of the spring guard 7. The two ends of the spring guard 7 are respectively connected to the annular protrusions of the moving ring 3 and the impeller shaft 2. This connection method can fix the axial position of the spring guard 7, prevent it from moving during pump operation, and ensure the stability of the protection range.

[0025] Furthermore, the elastic element 5 is made of stainless steel spring to ensure basic elastic performance. In order to improve corrosion resistance, the surface of the elastic element 5 is also provided with a zinc anti-corrosion layer with a coating thickness controlled at 8-10μm, so as to isolate the additives from direct contact with the elastic element 5, delay the corrosion failure of the elastic element 5, and improve the service life of the elastic element 5.

Claims

1. An admixture booster pump, characterized in that, The pump body (1) includes a stainless steel impeller shaft (2) installed at the output end of the pump body (1). A rotating ring (3) is installed on the impeller shaft (2). A stationary ring (4) is provided on the inner wall of the pump body (1) end cover, which is opposite to the rotating ring (3). An elastic element (5) is also provided on the impeller shaft (2) to provide sealing pressure by abutting the side of the rotating ring (3) away from the stationary ring (4). The pump body (1) also includes an anti-corrosion component located upstream of the contact surface between the rotating ring (3) and the stationary ring (4). The anti-corrosion component includes a liquid-blocking component (6) and a protective spring component (7). The liquid-blocking component (6) is an annular structure and is sleeved on the impeller shaft (2). The inner wall of the liquid-blocking component (6) is sealed and fitted with the impeller shaft (2), and the outer wall is sealed and fitted with the inner wall of the pump body (1) end cover. The protective spring component (7) is a telescopic tubular structure, sleeved on the outside of the elastic element (5) and maintaining a clearance fit with the elastic element (5).

2. The admixture booster pump according to claim 1, characterized in that, The liquid baffle (6) includes a connecting ring (61) integrally formed and connected to the impeller shaft (2) and a U-shaped sealing ring (62) provided on the connecting ring (61). The U-shaped sealing ring (62) is made of fluororubber and its opening faces the side of the pump body (1) with additives.

3. The admixture booster pump according to claim 1, characterized in that, An abutment ring (11) is connected to the inner wall of the pump body (1) end cover. A shallow groove (12) is provided on the inner circumference of the abutment ring (11) corresponding to the lip of the U-shaped sealing ring (62) away from the connecting ring (61).

4. The admixture booster pump according to claim 2, characterized in that, The impeller shaft (2) has an annular protrusion (8) on its annular protrusion, and the annular protrusion (8) abuts against the closed end of the U-shaped sealing ring (62).

5. The admixture booster pump according to claim 1, characterized in that, The spring guard (7) is a corrugated hose with a wear-resistant coating on its surface, and the two ends of the spring guard (7) are respectively connected to the annular protrusions of the moving ring (3) and the impeller shaft (2).

6. The admixture booster pump according to claim 1, characterized in that, The elastic element (5) is a stainless steel spring, and the surface of the elastic element (5) is provided with a zinc-plated anti-corrosion layer.

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