Water pump and mechanical seal anti-dry-grinding structure thereof

Abstract

The utility model provides a water pump and mechanical seal anti-dry grinding structure, including gland, stationary seal and moving ring subassembly, the gland is fixed on the pump casing, stationary seal is fixedly connected with the gland, moving ring subassembly is fixedly connected with the shaft sleeve, stationary seal and moving ring subassembly are both located outside the shaft sleeve, the gland is provided with the pipeline for lubricating fluid circulation, and the pipeline is provided with the shaft sleeve. Lubricating liquid penetrates through the pipeline, the gap between the shaft sleeve and the static ring and the abutting face between the static ring and the movable ring assembly, so that the purpose that the dry grinding phenomenon is not prone to occurring is achieved.

Description

Technical Field

[0001] The utility model relates to a water pump, in particular to a water pump and a mechanical seal anti-dry wear structure thereof. Background Art

[0002] At present, centrifugal pumps are widely used in circulation systems in petrochemical, metallurgical and other industries. The working principle of centrifugal pumps is to transport fluids by the centrifugal force generated by the rotation of the impeller.

[0003] A Chinese patent with authorization announcement number CN206753996U discloses a centrifugal pump including: a pump casing, an extrusion chamber is formed inside the pump casing, the extrusion chamber is located in the middle of two suction chambers, and the extrusion chamber is used to pump out fluid; the centrifugal pump also includes: an annular impeller chamber; the impeller chamber is arranged in the pump casing; two water inlets are opened in the shaft sleeve direction of the impeller chamber, and an annular water outlet is opened in the circumferential direction of the impeller chamber; wherein, the two water inlets of the impeller chamber are respectively connected to the two suction chambers, and the annular water outlet of the impeller chamber is connected to the extrusion chamber; wherein, the two water inlets of the impeller chamber are circular, and the diameter is larger than the diameter of the pump shaft sleeve; the diameter of the water inlet of the impeller chamber is 450-500 mm, so that when the flow rate is increased, the flow rate of the water inlet of the impeller chamber in the centrifugal pump is still relatively slow.

[0004] This centrifugal pump solves the problem in the prior art that when the flow rate is fast, the fluid is prone to cavitation in the impeller chamber, which in turn causes damage to the impeller in the impeller chamber due to cavitation. Some centrifugal pumps also have a mechanical seal dynamic ring and a static ring between the pump sleeve and the pump casing, and dry grinding between the mechanical seal dynamic ring and the static ring is also difficult to avoid. Utility Model Content

[0005] In view of this, the utility model aims to provide a water pump and a mechanical seal anti-dry grinding structure thereof, so as to achieve the purpose of preventing dry grinding from occurring.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a mechanical seal anti-dry wear structure, including a gland, a static ring, a dynamic ring assembly, a transmission shaft, and a pump casing, the gland is fixed on the pump casing, the static ring is fixedly connected to the gland, the dynamic ring assembly is fixedly connected to the sleeve, the static ring and the dynamic ring assembly are both located outside the sleeve, the gland is provided with a pipeline for the circulation of lubricating liquid, the lubricating liquid passes through the pipeline, the gap between the sleeve and the static ring, and the contact surface between the static ring and the dynamic ring assembly, and the transmission shaft drives the sleeve to rotate.

[0007] To implement the above technical solution, the gland is fixed on the pump casing, the dynamic ring assembly is fixed on the shaft sleeve, the static ring is connected to the gland, and the lubricating liquid flows through the pipeline, the gap and the contact surface in sequence to form an oil film on the gap and the contact surface, thereby achieving a lubrication effect, so that during the rotation of the shaft sleeve, the contact surface has better lubricity and sealing, and dry grinding is not prone to occur.

[0008] As a preferred solution of the utility model, the stationary ring includes a first O-ring and a fixed ring. A positioning groove is provided on the pressure cover. The fixed ring is sleeved on the outside of the sleeve and has an arc groove on the side facing the pressure cover. A positioning cavity for fixing the first O-ring is formed between the positioning groove and the arc groove.

[0009] To implement the above technical solution, the first O-ring is located in the positioning cavity, and through the conduction effect of the arc groove, the fixed ring can have a tendency to move closer to the dynamic ring assembly, so that the connection between the fixed ring and the dynamic ring assembly is tighter.

[0010] As a preferred solution of the utility model, the dynamic ring assembly includes a dynamic ring seat, a second O-ring and a pressure ring, the dynamic ring seat is fixed on the shaft sleeve, the pressure ring is provided with a conductive arc surface on the side facing the shaft sleeve, the pressure ring is in contact with the static ring, the second O-ring is fixed on the shaft sleeve and embedded in the conductive arc surface, and an elastic structure is provided between the dynamic ring seat and the pressure ring.

[0011] To implement the above technical solution, through the setting of the elastic structure, the dynamic ring seat can exert a force on the pressure ring in the direction of approaching the static ring, so that the connection between the pressure ring and the static ring is tighter, and the sealing is greatly improved; due to the conductive effect of the conductive arc surface, the second O-ring can exert a force on the pressure ring in the direction of approaching the static ring.

[0012] As a preferred solution of the utility model, the elastic structure includes an elastic member and a gasket, the gasket abuts against one end of the pressure ring away from the static ring, and the two ends of the elastic member are respectively connected to the dynamic ring seat and the gasket.

[0013] To implement the above technical solution, the elastic member applies a force to the gasket ring through the elastic force of the elastic member itself, and the gasket ring applies a force to the pressure ring.

[0014] As a preferred solution of the utility model, a slot is provided on the dynamic ring seat, and the end of the elastic member is embedded in the slot.

[0015] By implementing the above technical solution, the elastic member is limited in the slot, so that the elastic member guides the direction of the force applied to the pressure ring.

[0016] As a preferred solution of the utility model, the dynamic ring seat is provided with an anti-slip ring, and the anti-slip ring is located outside the pressure ring.

[0017] To implement the above technical solution, during the high-speed rotation of the sleeve, the pressure ring tends to move away from the sleeve due to centrifugal force. The stability of the pressure ring is improved by setting the anti-slip ring.

[0018] As a preferred solution of the utility model, one end of the anti-slip ring away from the dynamic ring seat is bent toward a side close to the pressure ring to form an elastic portion.

[0019] By implementing the above technical solution, the elastic part applies a force to the pressure ring, and the anti-slip ring is not easily deformed.

[0020] As a preferred solution of the utility model, a positioning hole is provided on the gland, and a liquid injection bottle storing lubricating liquid is threadedly connected to the positioning hole.

[0021] To implement the above technical solution, the lubricating liquid is injected into the liquid injection bottle, and then the liquid injection bottle is threadedly connected to the positioning hole, which is convenient for installation.

[0022] As a preferred solution of the utility model, the end of the gland extends toward the direction close to the shaft sleeve and has a placement ring, an oil seal is fixedly connected between the placement ring and the gland, and the oil seal contacts the shaft sleeve.

[0023] To implement the above technical solution, the oil seal is provided to prevent the lubricating fluid from leaking out in large quantities.

[0024] The utility model also provides a water pump, comprising the above-mentioned mechanical seal anti-dry wear structure.

[0025] By implementing the above technical solution, after the water is pumped out or before the water is pumped out, there is no water in the pump casing, and dry grinding is not likely to occur between the shaft sleeve and the pump casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of Example 1;

[0027] Figure 2 This is a schematic diagram of the structure of Example 2.

[0028] Figure numerals: 1. gland; 10. pump casing; 11. pipeline; 12. positioning hole; 13. injection bottle; 14. placement ring; 15. oil seal; 16. sleeve; 2. static ring; 21. first O-ring; 22. fixing ring; 23. positioning groove; 24. arc groove; 3. dynamic ring assembly; 31. dynamic ring seat; 32. second O-ring; 33. pressure ring; 4. elastic structure; 41. elastic part; 42. gasket; 5. slot; 6. conductive arc surface; 71. anti-slip ring; 72. elastic part; 8. waterway; 81. water pipe; 9. casing; 100. transmission shaft. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0030] Embodiment 1: A mechanical seal anti-dry wear structure comprises a gland 1, a stationary ring 2, and a dynamic ring assembly 3.

[0031] The gland 1 is fixed to the pump housing 10 by bolts. A pipe 11 for the circulation of lubricating liquid is provided on the gland 1. The pipe 11 is placed vertically. A positioning hole 12 is provided at the end of the pipe 11. A liquid injection bottle 13 for storing lubricating liquid is threadedly connected to the positioning hole 12. Due to the effect of gravity, the lubricating liquid in the liquid injection bottle 13 is injected into the pipe 11.

[0032] A placement ring 14 is provided at the end of the gland 1 and extends toward the shaft sleeve 16 ; an oil seal 15 is fixedly connected between the placement ring 14 and the gland 1 , and the oil seal 15 contacts the shaft sleeve 16 , and the oil seal 15 has a good sealing effect on the lubricating fluid.

[0033] The stationary ring 2 is fixedly connected to the gland 1. The stationary ring 2 includes a first O-ring 21 and a fixing ring 22. A positioning groove 23 with an L-shaped cross section is provided on the gland 1. The fixing ring 22 is sleeved on the outside of the shaft sleeve 16, and an arc groove 24 is provided on the side of the fixing ring 22 facing the gland 1. A positioning cavity for fixing the first O-ring 21 is formed between the positioning groove 23 and the arc groove 24. The gland 1 and the stationary ring 2 remain stationary.

[0034] The moving ring assembly 3 is fixedly connected to the shaft sleeve 16, and the moving ring assembly 3 is located outside the shaft sleeve 16. The moving ring assembly 3 includes a moving ring seat 71, a second O-ring 32 and a pressure ring 33. The moving ring seat 31 is fixed to the shaft sleeve 16 by bolts. A slot 5 is provided on the side of the moving ring seat 31 facing the pressure ring 33, and one end of the elastic member 41 is embedded in the slot 5. The elastic member 41 is a spring. The gasket 42 abuts against the end of the pressure ring 33 away from the stationary ring 2. The end of the elastic member 41 away from the slot 5 abuts against the gasket 42. The elastic member 41 and the gasket 42 form an elastic structure 4. The transmission shaft 100 penetrates into the shaft sleeve 16 and drives the shaft sleeve 16 to rotate through a key.

[0035] The side of the pressure ring 33 facing the sleeve 16 is provided with a conductive arc surface 6, and the end surface of the pressure ring 33 contacts the end surface of the fixed ring 22. The second O-ring 32 is fixed on the sleeve 16 and embedded in the conductive arc surface 6. The dynamic ring assembly 3 and the sleeve 16 remain relatively stationary.

[0036] An anti-slip ring 71 is integrally provided at one end of the dynamic ring seat 31 facing the pressure ring 33, and the anti-slip ring 71 is located outside the pressure ring 33; wherein, the anti-slip ring 71 and the dynamic ring seat 31 are integrated, and the inner hole of the dynamic ring seat 31 has four pressed bosses that cooperate with the grooves on the outer ring surface of the pressure ring 33 (not shown in the figure), which can also effectively limit the rotation of the pressure ring 33 during operation.

[0037] The end of the anti-drop ring 71 away from the dynamic ring seat 31 is bent toward the side close to the pressure ring 33 to form an elastic portion 72. The elastic portion 72 is also located on the side of the pressure ring 33 away from the shaft sleeve 16.

[0038] The elastic structure 4 causes the pressure ring 33 to move toward the fixing ring 22 to maintain sealing performance.

[0039] The lubricating liquid passes through the gap between the pipe 11, the sleeve 16 and the stationary ring 2, and the contact surface between the stationary ring 2 and the dynamic ring assembly 3. An oil film formed by the lubricating liquid is obtained on the gap and the contact surface. The oil film greatly improves the lubricity and has excellent sealing performance.

[0040] An L-shaped water channel 8 is also provided at the upper end of the gland 1, and a water pipe 81 is connected to the upper end of the water channel 8, and the water pipe 81 is fixedly connected to the gland 1. One end of the water channel 8 away from the water pipe 81 is connected to the pump housing 10. Water is injected into the water channel 8 from the water pipe 81, and then discharged from the water channel 8. The water passes through the gap between the gland 1 and the pump housing 10 to flush the connection between the dynamic ring assembly 3 and the static ring 2.

[0041] Embodiment 2: A water pump comprises a pump casing 10 and a mechanical seal anti-dry wear structure of Embodiment 1. The mechanical seal anti-dry wear structure has two groups, which are respectively located at two ends of the pump casing 10 of the water pump.

[0042] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A mechanical seal anti-dry wear structure, characterized by: The invention comprises a gland (1), a stationary ring (2), a dynamic ring assembly (3), a transmission shaft (100), and a pump casing (10); the gland (1) is fixed on the pump casing (10); the stationary ring (2) is fixedly connected to the gland (1); the dynamic ring assembly (3) is fixedly connected to the shaft sleeve (16); the stationary ring (2) and the dynamic ring assembly (3) are both located outside the shaft sleeve (16); a pipe (11) for the circulation of lubricating fluid is provided on the gland (1); the lubricating fluid passes through the pipe (11), the gap between the shaft sleeve (16) and the stationary ring (2), and the contact surface between the stationary ring (2) and the dynamic ring assembly (3); and the transmission shaft (100) drives the shaft sleeve (16) to rotate.

2. The mechanical seal anti-dry wear structure according to claim 1 is characterized in that: The stationary ring (2) comprises a first O-ring (21) and a fixed ring (22); a positioning groove (23) is provided on the gland (1); the fixed ring (22) is sleeved on the outside of the shaft sleeve (16) and is provided with an arc groove (24) on the side facing the gland (1); a positioning cavity for fixing the first O-ring (21) is formed between the positioning groove (23) and the arc groove (24).

3. A mechanical seal anti-dry wear structure according to claim 1 or 2, characterized in that: The dynamic ring assembly (3) comprises a dynamic ring seat (31), a second O-ring (32) and a pressure ring (33); the dynamic ring seat (31) is fixed on the shaft sleeve (16); the pressure ring (33) is provided with a conductive arc surface (6) on the side facing the shaft sleeve (16); the pressure ring (33) contacts the stationary ring (2); the second O-ring (32) is fixed on the shaft sleeve (16) and embedded in the conductive arc surface (6); and an elastic structure (4) is provided between the dynamic ring seat (31) and the pressure ring (33).

4. The mechanical seal anti-dry wear structure according to claim 3 is characterized in that: The elastic structure (4) comprises an elastic member (41) and a gasket (42), wherein the gasket (42) contacts the end of the pressure ring (33) away from the stationary ring (2), and the two ends of the elastic member (41) are respectively connected to the dynamic ring seat (31) and the gasket (42).

5. The mechanical seal anti-dry wear structure according to claim 4 is characterized in that: The movable ring seat (31) is provided with a clamping groove (5), and the end of the elastic member (41) is embedded in the clamping groove (5).

6. The mechanical seal anti-dry wear structure according to claim 3 is characterized in that: The movable ring seat (31) is provided with an anti-slip ring (71), and the anti-slip ring (71) is located outside the pressure ring (33).

7. The mechanical seal anti-dry wear structure according to claim 6 is characterized in that: The end of the anti-slip ring (71) away from the dynamic ring seat (31) is bent toward the side close to the pressure ring (33) to form an elastic part (72).

8. The mechanical seal anti-dry wear structure according to claim 1 is characterized in that: The gland (1) is provided with a positioning hole (12), and the positioning hole (12) is internally threadedly connected with a liquid injection bottle (13) for storing lubricating liquid.

9. A mechanical seal anti-dry wear structure according to claim 1 or 8, characterized in that: The end of the gland (1) extends in a direction close to the shaft sleeve (16) and is provided with a placement ring (14). An oil seal (15) is fixedly connected between the placement ring (14) and the gland (1), and the oil seal (15) is in contact with the shaft sleeve (16).

10. A water pump, characterized in that: It comprises a mechanical seal anti-dry wear structure as described in claim 1, 2 or 8.

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