Automatic locking mechanism for desulfurization slurry circulation pump impeller

Abstract

The present invention relates to the technical field of circulation pumps, and more particularly to an automatic locking device for a desulfurization slurry circulation pump impeller, comprising: a pump body comprising a pump shaft, a first pump housing provided on the outer wall of the pump shaft, a second pump housing provided on one side of the first pump housing, and an impeller provided between the first pump housing and the second pump housing; and a lock assembly comprising a lock ring provided on the outer wall of the pump shaft and a lock pin combined with the lock ring. The beneficial effects of the present invention are as follows. By eliminating the use of a lock nut on the impeller and providing a blind screw hole in the center of the impeller, the direction of screw rotation is aligned with the direction of impeller rotation. This ensures that a tightening torque is always applied to the impeller, both during forward rotation at startup and during instantaneous reverse rotation caused by slurry backflow at stopping. Furthermore, the combination of the lock ring and lock pin allows for simultaneous axial pressure transmission to both the impeller and the mechanical seal by tightening the lock pin, and also applies circumferential pressure to the mechanical seal. This ensures both fastening and sealing of the impeller and the mechanical seal simultaneously.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of circulation pumps, and in particular, relates to an automatic locking and fastening device for an impeller of a desulfurization slurry circulation pump.

BACKGROUND ART

[0002] The desulfurization slurry circulation pump is one of the core facilities in the exhaust gas desulfurization system, and is mainly used for the circulating transportation of desulfurizing agents. The design of such pumps is usually adapted to the characteristics of the exhaust gas desulfurization process of thermal power plants, and is carried out to meet the requirements of the exhaust gas desulfurization process in plants of 1000MW and below. The main structure of the pump is composed of a pump housing, an impeller, a seal ring, a shaft seal, and the like. Among them, the pump housing is usually made of high-strength materials such as stainless steel and alloy steel, which ensures strength while achieving weight reduction. The impeller is an important component of the pump, which uses centrifugal force to push the desulfurization slurry outward from the center, and plays a role in increasing the pressure of the fluid. Sealing devices, especially mechanical seals, are extremely important for preventing leakage from the pump and ensuring the safety and stability of system operation.

[0003] In conventional desulfurization slurry circulation pumps, the impeller is fastened with an impeller nut. Under the operating conditions of frequent start and stop of the slurry circulation pump, the impeller nut is subjected to alternating torques of forward and reverse rotation, which easily causes the nut to loosen and the impeller to fall off.

[0004] Since the seal between the impeller, the impeller nut and the shaft only depends on the fastening force of the impeller nut, the reliability is insufficient, and leakage caused by the loosening of the nut is prone to occur.

SUMMARY OF THE INVENTION

[0005] The present invention is proposed in view of the above-mentioned existing technical problems.

[0006] To solve the above technical problems, the present invention provides the following technical solution, and the automatic locking fastening device for a desulfurization slurry circulation pump impeller includes a pump body comprising a pump shaft, a first pump housing provided on the outer wall of the pump shaft, a second pump housing provided on one side of the first pump housing, and an impeller provided between the first pump housing and the second pump housing, and a lock assembly comprising a lock ring provided on the outer wall of the pump shaft and a lock pin combined with the lock ring.

[0007] In a preferred embodiment of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention, a mounting groove is provided inside the impeller, and the mounting groove is movably fitted with the pump shaft.

[0008] In a preferred embodiment of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention, a first screw is provided inside the mounting groove, and a second screw is provided at one end of the pump shaft closest to the impeller, and the first screw and the second screw are screwed together.

[0009] In a preferred embodiment of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention, a mounting ring is provided on the outside of the first pump housing away from the second pump housing, and a seal block is provided inside the mounting ring.

[0010] In a preferred embodiment of the automatic locking device for the desulfurization slurry circulation pump impeller according to the present invention, a pressure receiving plate is provided on the end face of the seal block that contacts the lock ring, and a first force transmission member and a second force transmission member are provided between the pressure receiving plate and the seal block.

[0011] In a preferred embodiment of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention, a plurality of the first force transmission member and the second force transmission member are arranged in a sequence, the axis of the first force transmission member is parallel to the axis of the pump shaft, and the second force transmission member intersects the axis of the pump shaft.

[0012] In a preferred embodiment of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention, a mounting box is provided on the outer wall of the pump shaft, seal rings are provided at both ends of the mounting box, and the seal rings are located on the outer wall of the pump shaft.

[0013] In a preferred embodiment of the automatic locking device for the impeller of a desulfurization slurry circulation pump according to the present invention, the lock ring is located between the seal ring and the mounting box, the seal ring is provided with a mounting hole for engaging with the pump shaft, and the side of the seal ring closest to the impeller is provided with an inclined surface.

[0014] In a preferred embodiment of the automatic locking device for the desulfurization slurry circulation pump impeller according to the present invention, an expansion hole is provided inside the lock ring, and a lock hole is further provided inside the lock ring, wherein the axis of the lock hole is on the same line as the axis of the expansion hole.

[0015] In a preferred embodiment of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention, the lock pin includes a lock bolt and an expansion sleeve provided on the outer wall of the lock bolt.

[0016] The beneficial effects of the automatic locking fastening device for the impeller of a desulfurization slurry circulation pump according to the present invention are as follows: By eliminating the use of a lock nut on the impeller and providing a screw blind hole in the center of the impeller, and by aligning the direction of screw rotation with the direction of impeller rotation, a tightening torque is always applied to the impeller in both the forward rotation at startup and the instantaneous reverse rotation caused by slurry backflow at stopping. Furthermore, by combining a lock ring and a lock pin, tightening the lock pin simultaneously transmits axial pressure to both the impeller and the mechanical seal, and in addition, circumferential pressure can be applied to the mechanical seal, thereby simultaneously ensuring fastening and sealing effects between the impeller and the mechanical seal. [Brief explanation of the drawing]

[0017] To more clearly explain the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below. Naturally, the drawings in the following description represent only a few embodiments of the present invention, and those skilled in the art can obtain other drawings based on these without requiring any creative effort. [Figure 1] This is a schematic diagram showing the overall structure of the automatic locking device for the impeller of a desulfurization slurry circulation pump according to the present invention. [Figure 2] This is a plan view of the automatic locking device for the impeller of a desulfurization slurry circulation pump according to the present invention. [Figure 3] This is a cross-sectional view of the automatic locking device for the impeller of a desulfurization slurry circulation pump according to the present invention. [Figure 4] This is an enlarged view of portion A of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention. [Figure 5] This is an enlarged view of portion B of the automatic locking fastening device for the desulfurization slurry circulation pump impeller according to the present invention. [Figure 6] This is a schematic diagram showing the lock assembly of the automatic locking device for the desulfurization slurry circulation pump impeller according to the present invention. [Figure 7]This is a cross-sectional view showing the lock assembly of the automatic locking and fastening device for the desulfurization slurry circulation pump impeller according to the present invention. [Figure 8] This is an enlarged view of part C of the automatic locking and fastening device for the desulfurization slurry circulation pump impeller according to the present invention. [Modes for Carrying Out the Invention]

[0018] In order to make the above objects, features and advantages of the present invention clearer and easier to understand, specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings of the specification.

[0019] In order to facilitate a thorough understanding of the present invention, numerous specific details are set forth in the following description. However, the present invention may be implemented in other ways different from those described herein, and a person of ordinary skill in the art may make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific examples disclosed below.

[0020] Further, as used herein, "one example" or "embodiment" refers to a specific feature, structure or characteristic that may be included in at least one embodiment of the present invention. In this specification, the phrase "in one embodiment" used in different places does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0021] Example 1 With reference to Figure 1 to Figure 5, the first embodiment of the present invention provides an automatic locking and fastening device for a desulfurization slurry circulation pump impeller, the device includes a pump body 100 and a lock assembly 200. The pump body 100 includes a pump shaft 101, a first pump housing 102 provided on the outer wall of the pump shaft 101, a second pump housing 103 provided on one side of the first pump housing 102, and an impeller 104 disposed between the first pump housing 102 and the second pump housing 103.

[0022] Preferably, the first pump housing 102, the second pump housing 103 and the impeller 104 are all mounted on the outer wall of the pump shaft 101, the impeller 104 is in transmission connection with the pump shaft 101, and a motor for driving the pump shaft 101 to rotate the impeller 104 is mounted on the side of the exterior of the pump shaft 101 away from the impeller 104.

[0023] A mounting groove 104a is provided inside the impeller 104, and the mounting groove 104a is movably fitted with the pump shaft 101.

[0024] Preferably, taking Figure 1 as an example, a side wall of the impeller 104 close to the pump shaft 101 is provided with a mounting groove 104a located collinearly with the axis of the pump shaft 101, and the mounting groove 104a can be fitted with an end of the pump shaft 101 close to the impeller 104.

[0025] A first thread 104b is provided inside the mounting groove 104a, a second thread 101a is provided at the end of the pump shaft 101 close to the impeller 104, and the first thread 104b and the second thread 101a are threadedly engaged.

[0026] The first thread 104b provided inside the mounting groove 104a is a free thread, the second thread 101a is provided at the end of the pump shaft 101 close to the impeller 104, the second thread 101a is also a free thread, and the length of the second thread 101a is set to be slightly longer than the length of the first thread 104b, that is, the second thread 101a provided on the pump shaft 101 is completely threadedly engaged with the first thread 104b provided inside the mounting groove 104a of the impeller 104, the rotation directions of the first thread 104b and the second thread 101a are consistent, and in either case of forward rotation during startup and instantaneous reverse rotation caused by slurry backflow during shutdown, a torque in the tightening direction always acts on the impeller 104 to prevent the impeller from falling off.

[0027] A mounting ring 102a is provided on the exterior of the first pump housing 102 on the side away from the second pump housing 103, and a seal block 105 is provided inside the mounting ring 102a.

[0028] Furthermore, multiple mounting rods 109a are arranged inside the mounting ring 102a and the second pump housing 103. The mounting rods 109a are used to fix the first pump housing 102 and the second pump housing 103. An equipment base 109 is provided at one end of each mounting rod 109a that is away from the pump housing, and the other end of each mounting rod 109a is screwed into the equipment base 109.

[0029] Preferably, a mounting box 107 is provided above the equipment base 109, and the mounting box 107 and the equipment base 109 are fixedly connected via bolts.

[0030] Furthermore, a mounting bar 108 is provided above the mounting box 107, and both ends of the mounting bar 108 are fixedly connected to the equipment base 109 via bolts. Multiple mounting bars 108 are provided, and the mounting box 107 and the equipment base 109 are fixed via the mounting bars 108.

[0031] Preferably, if the internal space of the mounting box 107 is sufficiently large, a seal ring 107a is provided inside the mounting box 107, and a through hole is provided in the axial direction of the seal ring 107a, i.e., in the axial direction of the pump shaft 101, for a sealed connection with the pump shaft 101, and the pump shaft 101 can rotate freely relative to the seal ring 107a.

[0032] As described above, by screwing the first screw 104b, which is provided inside the mounting groove 104a of the impeller 104, with the second screw 101a, which is provided at one end of the pump shaft 101 closest to the impeller 104, the lock nut of the impeller 104 is eliminated, replacing the screw and nut method of the conventional technology. As a result, in both the forward rotation during startup and the instantaneous reverse rotation caused by slurry backflow during stopping, a tightening torque is always applied to the impeller 104, preventing the impeller from falling off.

[0033] Example 2 Referring to Figures 1 to 8, a second embodiment of the present invention further provides an automatic locking device for the impeller of a desulfurization slurry circulation pump. A pressure receiving plate 105a is provided on the end face of the seal block 105, which contacts the lock ring 201, and a first force transmission member 105b and a second force transmission member 105c are provided between the pressure receiving plate 105a and the seal block 105.

[0034] Preferably, the seal block 105 is a mechanical seal assembly used to seal the pump shaft 101.

[0035] Furthermore, a pressure receiving plate 105a is provided on the end face of the seal block 105, and the pressure receiving plate 105a and the end face cover of the seal block 105 are press-molded as a single unit.

[0036] Preferably, the first force transmission member 105b and the second force transmission member 105c are rigidly connected to the pressure receiving plate 105a and the seal block 105, and the first force transmission member 105b and the second force transmission member 105c are located in the same plane, that is, the planes of symmetry of the first force transmission member 105b and the second force transmission member 105c are coplane. This allows the force transmitted from the lock ring 201 to be effectively actuated by the seal block 105.

[0037] Multiple first force transmission members 105b and second force transmission members 105c are arranged in a row, with the axis of the first force transmission member 105b being parallel to the axis of the pump shaft 101, and the second force transmission member 105c intersecting the axis of the pump shaft 101.

[0038] Preferably, in this embodiment, the first force transmission member 105b and the second force transmission member 105c are cylindrical bodies, the angle between the axis of the second force transmission member 105c and the axis of the pump shaft 101 is denoted as ∠A, and ∠A is an acute angle. Furthermore, the first force transmission member 105b is set to a position closer to the pump shaft 101 than the position of the second force transmission member 105c.

[0039] A mounting box 107 is further provided on the outer wall of the pump shaft 101, and seal rings 106 are provided at both ends of the mounting box 107, with the seal rings 106 located on the outer wall of the pump shaft 101.

[0040] The lock assembly 200 includes a lock ring 201 provided on the outer wall of the pump shaft 101 and a lock pin 202 that is combined with the lock ring 201.

[0041] The lock ring 201 is located between the seal ring 106 and the mounting box 107. The seal ring 106 is provided with a mounting hole 201a that is combined with the pump shaft 101, and an inclined surface 201b is provided on the side of the seal ring 106 closer to the impeller 104.

[0042] The cross-sectional view of the inclined surface 201b includes two endpoints, one of which is in contact with the pump shaft 101, and the other endpoint, which is away from the pump shaft 101, is point 201c, which is in contact with the pressure plate 105a.

[0043] Furthermore, in the cross-sectional view of the inclined surface 201b, the angle between the inclined surface 201b and the pump shaft 101 is obtuse. If this obtuse angle lies on the same side as the angle ∠A between the axis of the second force transmission member 105c and the axis of the pump shaft 101, that is, if ∠A can be observed from two directions, then if ∠A is obtuse when observed from right to left, the angle between the inclined surface 201b and the pump shaft 101 when observed from the same direction will be acute, and if observed from the opposite direction, it will be obtuse.

[0044] Furthermore, the contact point between point 201c and the pressure plate 105a is located closer to the second force transmission member 105c. When the lock pin 202 is tightened into the lock ring 201, the side wall of the lock ring 201 away from the impeller 104 is restrained by the seal ring 106. As a result, the lock pin 202 expands, causing deformation in the lock ring 201d, that is, point 201c deforms toward the impeller 104, and this force is transmitted through the pressure plate 105a to the impeller 104 and the mechanical seal, i.e., the seal block 10. The force is transmitted to the impeller 104, and at this time, since the contact point between point 201c and the pressure plate 105a is close to the second force transmission member 105c, the seal block 105 receives a first force parallel to the axis and a second force perpendicular to the axis via the second force transmission member 105c. The first force is transmitted through each member and gradually to the impeller 104, so that the impeller 104 and the seal block 105 are simultaneously subjected to the first force, and the seal block 105 is also simultaneously subjected to a second force perpendicular to the axis 101 of the pump shaft 101.

[0045] An expansion hole 201d is provided inside the lock ring 201, and a lock hole 201e is provided inside the lock ring 201, with the axis of the lock hole 201e being on the same line as the axis of the expansion hole 201d.

[0046] The lock pin 202 includes a lock bolt 202a and an expansion sleeve 202b provided on the outer wall of the lock bolt 202a.

[0047] The locking hole 201e is movably fitted with the locking bolt 202a, and the expansion hole 201d is movably fitted with the expansion sleeve 202b.

[0048] Furthermore, a second inclined surface 202c is provided on the inner wall of one end of the expansion sleeve 202b away from the lock bolt 202a, and the inclination direction of the second inclined surface 202c is inclined to gradually approach the axial direction of the expansion sleeve 202b. A divided groove 202d is further provided on the other end of the expansion sleeve 202b away from the lock bolt 202a, and when the lock bolt 202a is tightened toward the lock hole 201e, the expansion sleeve 202b is pushed outward by the action of the second inclined surface 202c, causing deformation of the lock ring 201, thereby subjecting the seal block 105 to a first force parallel to the axis and a second force perpendicular to the axis.

[0049] As described above, the first and second acting forces further enhance the sealing performance of the seal block 105, and the connection between the impeller 104 and the pump shaft 101 becomes tighter. This reduces vibrations that occur during the movement of the pump shaft 101, and these vibrations are fed back to the lock pin 202, preventing the lock pin 202 from falling off due to vibrations of the pump shaft 101 caused by insufficient connection of the components.

[0050] It should be noted that the structures and arrangements shown in the multiple different exemplary embodiments of this application are for illustrative purposes only. While only a few embodiments are described in detail in this disclosure, it should be readily apparent to anyone referring to this disclosure that many modifications are possible (e.g., changes in the dimensions, scale, structure, shape and proportions of various elements, parameter values ​​such as temperature and pressure, mounting arrangement, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and merits of the subject matter described herein. For example, elements shown as integrally formed may consist of multiple parts or elements, the positions of elements may be reversed or otherwise altered, and the properties, number or position of separate elements may be changed. Thus, all such variations are included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any “apparatus + function” clause refers to a structure that performs the function described herein and is intended to be not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, changes and omissions may be made in the design, operation and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to any particular embodiment, but extends to various modifications that fall within the scope of the appended claims.

[0051] Furthermore, in order to provide a concise description of exemplary embodiments, it is not necessary to describe all features of actual embodiments (i.e., features that are not relevant to the best mode of carrying out the present invention or features that are not relevant to realizing the invention).

[0052] It should be understood that many specific embodiments may be created during the development of actual embodiments, such as engineering components and design projects. While such development efforts may be complex and time-consuming, for those skilled in the art who benefit from this disclosure, it will be a conventional process of design, manufacturing, and production, without requiring excessive experimentation.

[0053] The above-described embodiments are merely for illustrating the technical solutions of the present invention and do not limit them. While the present invention has been described in detail with reference to preferred embodiments, those skilled in the art can modify or substitute equivalents to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and such modifications or substitutions should be included within the claims of the present invention.

Claims

1. An automatic locking and fastening device for the impeller of a desulfurization slurry circulation pump, A pump body (100) comprising a pump shaft (101), a first pump housing (102) provided on the outer wall of the pump shaft (101), a second pump housing (103) provided on one side of the first pump housing (102), and an impeller (104) provided between the first pump housing (102) and the second pump housing (103), An automatic locking device for a desulfurization slurry circulation pump impeller, comprising a lock assembly (200) which includes a lock ring (201) provided on the outer wall of the pump shaft (101) and a lock pin (202) which is combined with the lock ring (201).

2. An automatic locking fastening device for a desulfurization slurry circulation pump impeller according to claim 1, characterized in that a mounting groove (104a) is provided inside the impeller (104), and the mounting groove (104a) is movably fitted with the pump shaft (101).

3. An automatic locking fastening device for a desulfurization slurry circulation pump impeller according to claim 2, characterized in that a first screw (104b) is provided inside the mounting groove (104a), a second screw (101a) is provided at one end of the pump shaft (101) closest to the impeller (104), and the first screw (104b) and the second screw (101a) cooperate with each other.

4. An automatic locking fastening device for a desulfurization slurry circulation pump impeller according to claim 3, characterized in that a mounting ring (102a) is provided on the outside of the first pump housing (102) away from the second pump housing (103), and a seal block (105) is provided inside the mounting ring (102a).

5. The automatic locking fastening device for a desulfurization slurry circulation pump impeller according to claim 4, characterized in that a pressure receiving plate (105a) that contacts the lock ring (201) is provided on the end face of the seal block (105), and a first force transmission member (105b) and a second force transmission member (105c) are provided between the pressure receiving plate (105a) and the seal block (105).

6. The automatic locking fastening device for a desulfurization slurry circulation pump impeller according to claim 5, characterized in that a plurality of the first force transmission member (105b) and the second force transmission member (105c) are arranged in a sequence, the axis of the first force transmission member (105b) is parallel to the axis of the pump shaft (101), and the second force transmission member (105c) intersects the axis of the pump shaft (101).

7. An automatic locking fastening device for a desulfurization slurry circulation pump impeller according to claim 6, characterized in that a mounting box (107) is further provided on the outer wall of the pump shaft (101), seal rings (106) are provided on both ends of the mounting box (107), and the seal rings (106) are located on the outer wall of the pump shaft (101).

8. The lock ring (201) is located between the seal ring (106) and the mounting box (107), the seal ring (106) is provided with a mounting hole (201a) that is combined with the pump shaft (101), and an inclined surface (201b) is provided on the side of the seal ring (106) closer to the impeller (104), as described in claim 7, an automatic locking fastening device for a desulfurization slurry circulation pump impeller.

9. An automatic locking device for a desulfurization slurry circulation pump impeller according to claim 8, characterized in that an expansion hole (201d) is provided inside the lock ring (201), a lock hole (201e) is further provided inside the lock ring (201), and the axis of the lock hole (201e) is on the same line as the axis of the expansion hole (201d).

10. The automatic locking fastening device for a desulfurization slurry circulation pump impeller according to claim 9, characterized in that the lock pin (202) includes a lock bolt (202a) and an expansion sleeve (202b) provided on the outer wall of the lock bolt (202a).

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