Pump cover for preventing medium impact

Abstract

The utility model relates to the field of centrifugal pumps, in particular to a pump cover for preventing medium impact. The matched impeller and the main shaft are arranged to be of an annular structure, one side in the axial direction makes contact with a medium and is set to be a medium end, and the other side is set to be a sealing end. The medium end is provided with a buffer groove around the axis; the section, passing through the axis, of the buffer groove is of a multi-section structure and comprises a front section, a guide section and a recoil section. The incidence angle formed by the flow direction of the medium before the medium makes contact with the buffer groove and the dip angle of each part of the buffer groove is set to be alpha, the incidence angles of the front section, the guide section and the recoil section are set to be alpha 1, alpha 2 and alpha 3 respectively, and alpha 1 < alpha 2 < alpha 3. For the impact of a medium on the mechanical seal in the radial direction and the axial direction, the buffer groove is formed, the medium is guided to deflect gradually through the gradually-increased attack angle of the front section, the guide section and the recoil section in the buffer groove, then large-amplitude rotation is achieved, and the impact force of the rotated medium acts on the medium, so that the mechanical seal is more stable. Therefore, the impact force of the medium on the mechanical seal in the axial direction and the radial direction is weakened.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pumps, and in particular to a pump cover for preventing media impact. Background Technology

[0002] In the design and application of centrifugal pumps, the pump cover is a key component, and its performance directly affects the overall efficiency, stability, and service life of the pump. Traditional pump cover designs often neglect the impact of the medium on the pump cover during pressurization, leading to easy damage to the pump cover, frequent failure of mechanical seal components, and increased equipment maintenance costs and downtime. In particular, after the medium is pressurized by the impeller rotation, its movement direction is complex and variable, including radial and axial flow, as well as helical flow around the impeller axis. Existing anti-impact measures often only cope with the impact of the medium in a single direction, making it difficult to meet the anti-impact requirements of the medium under complex flow conditions. Utility Model Content

[0003] The purpose of this invention is to provide a pump cover for preventing media impact, thereby solving the problem of excessive impact of media on the pump cover in the prior art.

[0004] The technical solution of this utility model is: a pump cover for preventing media impact, which is configured as a ring structure with an impeller and a main shaft. One side along the axial direction contacts the medium and is set as the medium end, and the other side is set as the sealing end; the medium end is provided with a buffer groove around the axis.

[0005] The cross-section of the buffer tank through the axis has a multi-segment structure, including a front section, a guide section, and a backflush section through which the medium flows in sequence; the angle of attack formed by the flow direction of the medium before contacting the buffer tank and the inclination angle of each part of the buffer tank is set as α, and the angles of attack of the front section, the guide section, and the backflush section are set as α1, α2, and α3, respectively, and α1 < α2 < α3.

[0006] Preferably, the medium end has a ring platform formed around the axis on the side of the buffer groove near the axis, and the ring platform cooperates with the impeller to form a semi-closed chamber;

[0007] The inner wall of the ring platform is formed with a deceleration platform, which is constructed as a non-rotating body structure and has a deceleration end face perpendicular to the rotation direction of the medium in the cavity.

[0008] Preferably, the front section, guide section and recoil section are connected by a circular arc transition.

[0009] Preferably, the end of the deceleration platform away from the ring platform extends along the axial direction to the side near the sealing end.

[0010] Preferably, the sealing end is provided with a connecting platform, and multiple connecting platforms are arranged around the axis, with a connecting hole opened parallel to the axis on any connecting platform.

[0011] Preferably, a sealing groove is formed on the outer wall around the axis.

[0012] Preferably, the thickness of the buffer groove is consistent along the normal direction of the tangent to any of its surfaces.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] (1) For the impact of the medium on the mechanical seal in the radial and axial directions, this application provides a buffer groove, and guides the medium to gradually deflect and achieve a large-scale rotation by gradually increasing the angle of attack of the front section, guide section and backflush section in the buffer groove, so that the impact force of the rotated medium acts on the medium itself, thereby weakening the impact force of the medium on the mechanical seal in the axial and radial directions.

[0015] (2) To address the impact of the medium flowing spirally with the impeller, this application provides a speed reduction platform. The speed reduction platform is a non-rotating structure and has a speed reduction end face perpendicular to the spiral flow direction of the medium. The speed reduction platform intercepts and weakens the spiral flow of the medium through the speed reduction end face, thereby reducing the impact of the medium on the sealing assembly. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is an assembly drawing of a pump cover for preventing media impact, as described in this utility model.

[0018] Figure 2 This is a first-view structural diagram of a pump cover for preventing media impact according to the present invention;

[0019] Figure 3 This is a second-view structural diagram of a pump cover for preventing media impact according to the present invention;

[0020] Figure 4 This is a cross-sectional view of a pump cover for preventing media impact, as described in this utility model.

[0021] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 6 for Figure 5 Enlarged view at point C;

[0023] Figure 7 for Figure 1 Enlarged view at point B in the middle;

[0024] Among them: 100, pump cover; 11, mechanical seal assembly; 12, impeller; 13, main shaft; 14, pump assembly; 2, buffer tank; 21, front section; 22, guide section; 23, backflush section; 3, ring platform; 4, deceleration platform; 5, connecting platform; 6, sealing groove. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments:

[0026] like Figure 2 - Figure 4 As shown, a pump cover is used to prevent media impact. It is applied to centrifugal pumps, in conjunction with... Figure 1 The pump cover 100 is fitted onto the main shaft 13 via a mechanical seal assembly 11. The impeller 12 is located at the left end of the pump cover 100 along the axial direction, and the pump assembly 14 is located at the right end. The opening at the left end of the impeller 12 along the axial direction serves as the water inlet. The medium (water) drawn into the inlet is pressurized by the rotation of the impeller 12 and discharged from the outlet at the top. During this process, the medium comes into contact with the left end of the pump cover 100. Therefore, in this embodiment, the left end of the pump cover 100 is designated as the medium end, and the right end of the pump cover 100 is designated as the sealing end.

[0027] like Figure 2 As shown, a buffer groove 2 is provided around the axis at the medium end to reduce the impact of the medium pressurized by the impeller 12 on the pump cover 100, thereby protecting the mechanical seal assembly 11 and preventing it from failing due to impact. The cross-section of the buffer groove 2 through the axis is as follows: Figure 5 The multi-segment structure shown includes a front segment 21, a guide segment 22, and a recoil segment 23. Furthermore, the front segment 21, the guide segment 22, and the recoil segment 23 are connected by a circular arc transition.

[0028] According to the flow direction of the medium, the medium will come into contact with the front section 21, the guide section 22, and the backwash section 23 in sequence, such as Figure 6 As shown, the angle formed by the flow direction of the medium before contacting the front section 21 and the inclination angle of each part of the buffer tank 2 is set as the angle of attack α. Accordingly, the angles of attack of the front section 21, the guide section 22 and the backflush section 23 are set as α1, α2 and α3, respectively, and α1 < α2 < α3.

[0029] When the medium comes into contact with the front section 21, because the angle of attack α1 is small, the medium will adhere to the front section 21 and move to the guide section 22 with a small deflection. The angle of attack α2 of the guide section 22 is greater than α1, which will deflect the flow direction of the medium to a certain extent and guide the medium to the backflush section 23. The backflush end has the largest angle of attack α3. When the medium comes into contact with the backflush section 23, it will rotate significantly and backflush the medium behind the pump cover 100 that is about to impact it, thereby reducing the overall impact force of the medium on the pump cover 100.

[0030] After the medium is pressurized by the impeller 12, its movement direction is the synthesis of three sub-motions: radial flow, axial flow, and spiral flow around the axis with the impeller 12.

[0031] The aforementioned buffer groove 2 is used to counteract radial and axial flow impacts. To reduce the impact of the spiral flow of the medium on the pump cover 100, such as... Figure 7 As shown, at the medium end of the pump cover 100, a ring platform 3 is formed around the axis on the side of the buffer groove 2 near the axis. The top of the ring platform 3 is positioned near the impeller 12, so that the ring platform 3 and the impeller 12 form a semi-closed chamber, in which the spirally flowing medium impacting the mechanical seal assembly 11 is located. A deceleration platform 4 is formed on the inner wall of the ring platform 3. The deceleration platform 4 is constructed as a non-rotating body structure and has a deceleration end face perpendicular to the medium flow direction in the chamber. The deceleration end face is impacted by the spirally flowing medium, thereby weakening the energy of the medium and decelerating the medium, thus reducing the impact force of the medium on the mechanical seal assembly 11.

[0032] Furthermore, the end of the deceleration platform 4 away from the ring platform 3 extends along the axial direction to the side near the sealing end, increasing the area of ​​the deceleration end face and enhancing the deceleration effect of the deceleration platform 4 on the spiral flow medium.

[0033] Other aspects, such as Figure 3 and Figure 4 As shown, the sealing end is provided with a connecting platform 5, and four connecting platforms 5 are arranged around the axis. A connecting hole is opened parallel to the axis on any connecting platform 5. The pump cover 100 and the pump assembly 14 can be connected by fasteners passing through the connecting holes. A sealing groove 6 is also opened around the axis on the outer wall of the pump cover 100. Figure 4 As shown, the thickness of the buffer groove 2 is consistent along the normal direction of the tangent on any of its surfaces, which makes it less likely to form casting defects such as sand holes and shrinkage porosity during the casting process. It also reduces the weight of the pump cover 100, making it easier to assemble and maintain.

[0034] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A pump cover for preventing media impact, comprising an impeller (12) and a main shaft (13) configured as an annular structure, one side of which contacts the medium along the axial direction and is designated as the medium end, and the other side as the sealing end; characterized in that, The medium end is provided with a buffer groove (2) around the axis; The buffer tank (2) has a multi-segment structure across its axis, including a front section (21), a guide section (22), and a backflush section (23) through which the medium flows in sequence. The angle of attack formed by the flow direction of the medium before contacting the buffer tank (2) and the inclination angle of each part of the buffer tank (2) is set as α. The angles of attack of the front section (21), the guide section (22), and the backflush section (23) are set as α1, α2, and α3, respectively, and α1 < α2 < α3.

2. A pump cover for preventing media impact according to claim 1, characterized in that, The medium end has a ring platform (3) formed around the axis on the side of the buffer tank (2) near the axis, and the ring platform (3) cooperates with the impeller (12) to form a semi-closed chamber; The inner wall of the ring platform (3) is formed with a deceleration platform (4), which is constructed as a non-rotating body structure and has a deceleration end face perpendicular to the rotation direction of the medium in the cavity.

3. A pump cover for preventing media impact according to claim 1, characterized in that, The front section (21), guide section (22) and recoil section (23) are connected by a circular arc transition.

4. A pump cover for preventing media impact according to claim 2, characterized in that, The end of the deceleration platform (4) away from the ring platform (3) extends along the axial direction to the side near the sealing end.

5. A pump cover for preventing media impact according to claim 1, characterized in that, The sealing end is provided with a connecting platform (5), and multiple connecting platforms (5) are arranged around the axis, with a connecting hole opened on any connecting platform (5) parallel to the axis.

6. A pump cover for preventing media impact according to claim 1, characterized in that, A sealing groove (6) is provided on the outer wall around the axis.

7. A pump cover for preventing media impact according to claim 1, characterized in that, The thickness of the buffer groove (2) is consistent along the normal direction of the tangent to any of its surfaces.

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