Dual mechanical seal device for pump

Abstract

The utility model relates to the technical field of pump shaft sealing, and discloses a dual mechanical sealing device for a pump, which comprises a pump shaft body, one side of the pump shaft body is provided with a sealing element, the sealing element is internally provided with a sealing mechanism for sealing the pump shaft, the left side of the sealing mechanism is provided with a guide mechanism for guiding the pump shaft, and the left side of the guide mechanism is provided with a sealing mechanism for sealing the pump shaft. A heat dissipation mechanism used for dissipating heat of the guide mechanism is arranged on the left side of the pump shaft body. The sealing mechanism comprises a sealing groove, the sealing groove is formed in the outer surface of the pump shaft body, a sealing ring in interference fit with the sealing groove is fixed in the sealing piece, a mounting groove is formed in the sealing groove, and a rubber ring is mounted in the mounting groove. Under the action of the elasticity of the compression spring, the movable plate is pushed to compress the rubber ring, so that the rubber ring is deformed under the pressure of the two sides, the inner side and the outer side of the rubber ring are ensured to be better attached to the pump shaft body and the mounting groove, and the better sealing effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of pump shaft sealing technology, specifically a double mechanical seal device for pumps. Background Technology

[0002] Mechanical seals for pumps are key components that provide dynamic sealing in pump equipment. They primarily prevent fluid from leaking to the outside through the pump shaft. A mechanical seal consists of at least one pair of end faces perpendicular to the axis of rotation, and also includes elastic elements, auxiliary sealing rings, a gland, and a shaft sleeve. The rotating ring, mounted on a rotating ring seat, rotates simultaneously with the shaft, while the stationary ring, mounted on a stationary ring seat in the pump body, is the stationary part. The pressure of the medium and the elastic force of the elastic element ensure that the axial sealing end faces of the rotating and stationary rings are tightly fitted and slide relative to each other, thus preventing fluid leakage. Simultaneously, auxiliary sealing rings provide sealing between the rotating ring and the shaft, and between the stationary ring and the gland.

[0003] In existing technologies, such as the high-sealing water pump bearing disclosed in CN214248022U, a bearing includes an outer ring and an inner ring. The outer ring has a first annular groove at both ends of its inner circumferential wall, and the inner ring has a second annular groove corresponding to the first annular groove on its outer circumferential wall. Each of the two first annular grooves contains a tensioning lip. The tensioning lip extends into the second annular groove, forming a first sealing lip and a second sealing lip. The first sealing lip is tensioned and fitted against the inner wall of the second annular groove, and the second sealing lip abuts against the outer circumferential wall of the inner ring. A retaining groove, arranged in an annular shape, is formed between the first and second sealing lips. This design, through the use of a steel frame, increases the rigidity of the tensioning lip, ensuring that the tensioning lip does not detach from the bearing when subjected to axial radial loads, further improving the stability of the tensioning lip on the bearing.

[0004] Existing sealing devices improve the rigidity of the expansion lip by setting a steel skeleton, ensuring that the expansion lip will not disengage from the bearing when the bearing is subjected to axial radial load. However, the sealing effect of the pump shaft seal using only the bearing is poor and cannot achieve a good sealing effect. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Given that the existing technology has the problem that using only bearings for pump shaft sealing results in poor sealing performance and cannot achieve a good sealing effect.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A double mechanical seal device for a pump includes a pump shaft body, a seal is installed on one side of the pump shaft body, a sealing mechanism for sealing the pump shaft is provided inside the seal, a guide mechanism for guiding the pump shaft is provided on the left side of the sealing mechanism, and a heat dissipation mechanism for dissipating heat from the guide mechanism is provided on the left side of the pump shaft body.

[0009] The sealing mechanism includes a sealing groove, which is formed on the outer surface of the pump shaft. A sealing ring that is interference-fitted with the sealing groove is fixed inside the sealing element. An installation groove is formed inside the sealing groove, and a rubber ring is installed inside the installation groove.

[0010] As a further improvement of this utility model: both sides of the rubber ring abut against movable plates, and the side walls of the movable plates abut against compression springs that are fixedly connected to the mounting groove.

[0011] As a further embodiment of this utility model: the guiding mechanism includes a fixed bearing, which is embedded in the inner wall of the seal.

[0012] As a further improvement of this utility model: the upper surface of the seal is threaded with a set screw that abuts against the outer wall of the fixed bearing.

[0013] As a further improvement of this utility model: four sets of heat pipes pass through the left side of the sealing element, and heat dissipation fins are fixed at the ends of the four sets of heat pipes.

[0014] As a further embodiment of this utility model: a fixing plate is installed at one end of the sealing element, and four fixing bolts that are threadedly connected to the sealing element are symmetrically installed inside the fixing plate.

[0015] As a further improvement of this utility model: the heat dissipation mechanism includes a connecting rod, which is inserted into one end of the pump shaft.

[0016] As a further improvement of this utility model: a fan blade is fixed to the end of the connecting rod, and a limiting bolt that abuts against the connecting rod is installed on the outer surface of the connecting rod.

[0017] As a further improvement of this utility model, four fixing holes are symmetrically opened on one side of the sealing element.

[0018] As a further improvement of this utility model: a connecting plate is fixed to the outer wall of the pump shaft, and four fixing screws that are threadedly connected to the fixing holes are symmetrically installed inside the connecting plate.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This utility model utilizes the elasticity of the compression spring to push the movable plate to press the rubber ring, causing the rubber ring to deform under the pressure on both sides. This ensures that the inner and outer sides of the rubber ring fit better with the pump shaft and mounting groove, thus guaranteeing a better sealing effect.

[0021] 2. This utility model can absorb the heat of the sealing component through the heat pipe, and transfer the heat to the surface of the heat dissipation fins. When the pump shaft rotates, it will drive the fan blades to rotate synchronously, thereby blowing air to dissipate heat from the heat dissipation fins and indirectly cooling the sealing component. Attached Figure Description

[0022] Figure 1 A three-dimensional structural schematic diagram of a double mechanical seal device for a pump;

[0023] Figure 2 This is a three-dimensional structural diagram of the sealing element in a double mechanical seal device for a pump;

[0024] Figure 3 This is a schematic cross-sectional view of the sealing element in a double mechanical seal device for a pump.

[0025] Figure 4 This is a schematic diagram of the internal structure of the seal element in a double mechanical seal device for a pump.

[0026] Figure 5 This is a side view of the sealing element in a double mechanical seal device for pumps.

[0027] In the diagram: 1. Pump shaft; 2. Seal; 3. Sealing groove; 31. Sealing ring; 32. Mounting groove; 33. Rubber ring; 34. Movable plate; 35. Compression spring; 4. Fixed bearing; 41. Set screw; 42. Heat pipe; 43. Heat dissipation fins; 44. Fixing plate; 45. Fixing bolt; 5. Connecting rod; 51. Fan blade; 52. Limit bolt; 6. Fixing hole; 7. Connecting plate; 8. Fixing screw. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0031] Example 1:

[0032] Please see Figures 1-5 This is the first embodiment of the present invention.

[0033] This embodiment provides a double mechanical seal device for a pump, including a pump shaft 1, a seal 2 installed on one side of the pump shaft 1, a sealing mechanism for sealing the pump shaft inside the seal 2, a guide mechanism for guiding the pump shaft on the left side of the sealing mechanism, and a heat dissipation mechanism for dissipating heat from the guide mechanism on the left side of the pump shaft 1.

[0034] The sealing mechanism includes a sealing groove 3, which is formed on the outer surface of the pump shaft 1. A sealing ring 31 that is interference-fitted with the sealing groove 3 is fixed inside the sealing element 2. An installation groove 32 is formed inside the sealing groove 3, and a rubber ring 33 is installed inside the installation groove 32.

[0035] Specifically, both sides of the rubber ring 33 are abutted by movable plates 34, and the side walls of the movable plates 34 are abutted by compression springs 35 that are fixedly connected to the mounting groove 32.

[0036] Furthermore, under the elasticity of the compression spring 35, the movable plate 34 will press the rubber ring 33 tightly, causing the rubber ring 33 to deform under the pressure on both sides, ensuring that the inner and outer sides of the rubber ring 33 fit better with the pump shaft body 1 and the mounting groove 32, thus ensuring a better sealing effect.

[0037] Specifically, the guiding mechanism includes a fixed bearing 4, which is embedded in the inner wall of the seal 2.

[0038] Furthermore, the smoothness of the pump shaft 1 rotation can be improved by the fixed bearing 4 installed on the pump shaft 1.

[0039] Specifically, the upper surface of the seal 2 is threaded with a set screw 41 that abuts against the outer wall of the fixed bearing 4.

[0040] Furthermore, by unscrewing the set screw 41, the fixed bearing 4 can be disassembled for easy replacement and maintenance.

[0041] In use, the seal 2 is first assembled onto the surface of the pump shaft 1. The sealing groove 3 on the surface of the pump shaft 1, in cooperation with the sealing ring 31, can play a sealing role. The rubber ring 33 set in the mounting groove 32 can further improve the sealing effect. The movable plates 34 on both sides of the rubber ring 33 can slide on the surface of the pump shaft 1. Under the action of the elasticity of the compression spring 35, the movable plates 34 will push the rubber ring 33 to press it, so that the rubber ring 33 is deformed by the pressure on both sides, ensuring that the inner and outer sides of the rubber ring 33 fit better with the pump shaft 1 and the mounting groove 32, ensuring a better sealing effect. In addition, the fixed bearing 4 set on the pump shaft 1 can improve the smoothness of the pump shaft 1 rotation.

[0042] In summary, when the pump uses a double mechanical seal device, the sealing effect can be further improved by the rubber ring 33 set in the mounting groove 32. The movable plates 34 on both sides of the rubber ring 33 can slide on the surface of the pump shaft 1. Under the action of the elasticity of the compression spring 35, the movable plates 34 will push the rubber ring 33 to press it, so that the rubber ring 33 will be deformed by the pressure on both sides, ensuring a better sealing effect.

[0043] Example 2:

[0044] Please see Figures 1-5 This is the second embodiment of the present utility model.

[0045] Specifically, four sets of heat pipes 42 pass through the left side of the seal 2, and heat dissipation fins 43 are fixed at the ends of the four sets of heat pipes 42.

[0046] Furthermore, the heat pipe 42 can absorb the heat from the seal 2, and the heat is transferred to the surface of the heat dissipation fins 43.

[0047] Specifically, a fixing plate 44 is installed at one end of the sealing element 2, and four fixing bolts 45 that are threadedly connected to the sealing element 2 are symmetrically installed inside the fixing plate 44.

[0048] Furthermore, the fixing plate 44 can be disassembled by unscrewing the fixing bolts 45 on the fixing plate 44.

[0049] Specifically, the heat dissipation mechanism includes a connecting rod 5, which is inserted into one end of the pump shaft 1. A fan blade 51 is fixed to the end of the connecting rod 5, and a limiting bolt 52 that abuts against the connecting rod 5 is installed on the outer surface of the connecting rod 5.

[0050] Furthermore, when the pump shaft 1 rotates, it will simultaneously drive the fan blades 51 to rotate, thereby blowing air to the heat dissipation fins 43 to dissipate heat and indirectly cool the seal 2.

[0051] Specifically, four fixing holes 6 are symmetrically opened on one side of the seal 2, and a connecting plate 7 is fixed on the outer wall of the pump shaft 1. Four fixing screws 8 that are threadedly connected to the fixing holes 6 are symmetrically installed inside the connecting plate 7.

[0052] Furthermore, tighten the fixing screws 8 on the connecting plate 7 so that the fixing screws 8 are threadedly connected to the fixing holes 6 on the seal 2, thereby fixing the seal 2.

[0053] In use, the connecting plate 7 on the pump shaft 1 can limit the sealing element 2. Tightening the fixing screw 8 on the connecting plate 7 makes the fixing screw 8 threadedly connected to the fixing hole 6 on the sealing element 2, thereby fixing the sealing element 2 and effectively reducing the possibility of the sealing element 2 falling off. Then, the connecting rod 5 is inserted into one end of the pump shaft 1, and the limiting bolt 52 on the pump shaft 1 is tightened to connect and fix the fan blade 51. In use, the coil inside the water pump is energized, causing the permanent magnet on the pump shaft 1 to rotate, synchronously driving the pump shaft 1 to rotate. The heat pipe 42 can absorb the heat of the sealing element 2, and the heat is transferred to the surface of the heat dissipation fins 43. When the pump shaft 1 rotates, it will synchronously drive the fan blade 51 to rotate, thereby blowing air to dissipate heat from the heat dissipation fins 43, indirectly cooling the sealing element 2. By unscrewing the fixing bolt 45 on the fixing plate 44, the fixing plate 44 can be disassembled. By unscrewing the set screw 41, the fixing bearing 4 can be disassembled for easy replacement and maintenance.

[0054] In summary, when the pump uses a double mechanical seal device, the sealing effect can be further improved by the rubber ring 33 set in the mounting groove 32. The movable plates 34 on both sides of the rubber ring 33 can slide on the surface of the pump shaft 1. Under the action of the elasticity of the compression spring 35, the movable plates 34 will push the rubber ring 33 to press it tightly, so that the rubber ring 33 will deform under the pressure on both sides, ensuring a better sealing effect. In addition, the heat pipe 42 can absorb the heat of the seal 2 and transfer the heat to the surface of the heat dissipation fins 43. When the pump shaft 1 rotates, it will drive the fan blades 51 to rotate synchronously, blowing air to dissipate heat from the heat dissipation fins 43, indirectly cooling the seal 2.

[0055] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0056] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0057] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A double mechanical seal device for a pump, comprising a pump shaft (1), characterized in that: A seal (2) is installed on one side of the pump shaft body (1). The seal (2) has a sealing mechanism for sealing the pump shaft inside. A guide mechanism for guiding the pump shaft is provided on the left side of the sealing mechanism. A heat dissipation mechanism for dissipating heat from the guide mechanism is provided on the left side of the pump shaft body (1). The sealing mechanism includes a sealing groove (3), which is opened on the outer surface of the pump shaft (1). The sealing ring (31) that is interference-fitted with the sealing groove (3) is fixed inside the sealing element (2). An installation groove (32) is opened inside the sealing groove (3), and a rubber ring (33) is installed inside the installation groove (32).

2. The double mechanical seal device for pumps according to claim 1, characterized in that: Both sides of the rubber ring (33) are abutted by movable plates (34), and the side wall of the movable plate (34) is abutted by a compression spring (35) that is fixedly connected to the mounting groove (32).

3. The double mechanical seal device for pumps according to claim 2, characterized in that: The guiding mechanism includes a fixed bearing (4) which is embedded in the inner wall of the seal (2).

4. A double mechanical seal device for a pump according to claim 3, characterized in that: The upper surface of the seal (2) is threaded with a set screw (41) that abuts against the outer wall of the fixed bearing (4).

5. A double mechanical seal device for a pump according to claim 4, characterized in that: Four sets of heat pipes (42) are passed through the left side of the sealing element (2), and heat dissipation fins (43) are fixed at the ends of the four sets of heat pipes (42).

6. A double mechanical seal device for a pump according to claim 5, characterized in that: A fixing plate (44) is installed at one end of the sealing element (2), and four fixing bolts (45) that are threadedly connected to the sealing element (2) are symmetrically installed inside the fixing plate (44).

7. A double mechanical seal device for a pump according to claim 6, characterized in that: The heat dissipation mechanism includes a connecting rod (5), which is inserted into one end of the pump shaft (1).

8. A double mechanical seal device for a pump according to claim 7, characterized in that: The end of the connecting rod (5) is fixed with a fan blade (51), and the outer surface of the connecting rod (5) is fitted with a limiting bolt (52) that abuts against the connecting rod (5).

9. A double mechanical seal device for a pump according to claim 8, characterized in that: The sealing element (2) has four fixing holes (6) symmetrically opened on one side.

10. A double mechanical seal device for a pump according to claim 9, characterized in that: The outer wall of the pump shaft (1) is fixed with a connecting plate (7), and four fixing screws (8) that are threadedly connected to the fixing holes (6) are symmetrically installed inside the connecting plate (7).

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