Centrifugal pump equipment with double-sealing structure

Abstract

The utility model discloses centrifugal pump equipment with a double-sealing structure, which comprises a pump body, a pump cover, an impeller and a rotating shaft, the pump body is butted with the pump cover, the rotating shaft is fixed in the pump cover, the impeller is fixedly arranged on the rotating shaft, and a pump cavity is arranged in the pump body; the pump body is provided with an inlet ring part on one side part of the pump cavity, and is provided with an outlet part on the other side part of the pump cavity; the impeller comprises a front cover plate and a rear cover plate, one side of the front cover plate of the impeller is provided with an impeller chamber in an extending manner, blades are arranged in the impeller chamber, two adjacent blades are encircled to form an impeller runner, the impeller is provided with a runner outlet between the front cover plate and the rear cover plate, the impeller runner is communicated with the runner outlet, and the runner outlet is matched with the outlet part; a liquid inlet is formed in one side of the impeller chamber, a liquid inlet ring part is arranged on the periphery of the liquid inlet of the impeller chamber, and the liquid inlet ring part is matched with the inlet ring part. Through the first clearance fit structure and the second clearance fit structure, the volume efficiency of centrifugal pump equipment is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump device with a double sealing structure. Background Art

[0002] A centrifugal pump is a pump that transports liquids by the centrifugal force generated by the rotation of the impeller. Centrifugal pumps have many advantages, such as a wide range of performance, uniform flow, simple structure, reliable operation and convenient maintenance. Therefore, centrifugal pumps are most widely used in industrial and agricultural production. In-depth research on centrifugal pumps and consideration of the many factors that affect the performance of centrifugal pumps will have a good guiding role in engineering design and production.

[0003] Like other rotating equipment, there must be appropriate clearance between the stationary parts and rotating parts of the centrifugal pump. These clearance fits play an important role in the performance of the centrifugal pump. Moreover, the clearance fits at different positions and between different parts have different effects on the performance of the centrifugal pump.

[0004] At present, the most widely used sealing structure for centrifugal pumps in the industry is the flat ring single seal structure, which has a simple structure but average sealing effect. This leads to excessive gaps and has a significant impact on the flow rate, head, efficiency and other performance of the water pump, which is not conducive to improving the volumetric efficiency of centrifugal pump products.

[0005] Therefore, it is urgent to propose a centrifugal pump device with a double seal structure to solve the problem raised. Utility Model Content

[0006] Based on this, the purpose of the utility model is to provide a centrifugal pump device with a double sealing structure to effectively improve the volumetric efficiency of the centrifugal pump.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: a centrifugal pump device with a double seal structure, which includes a pump body, a pump cover, an impeller and a rotating shaft, wherein the pump body is docked with the pump cover, the rotating shaft is fixed in the pump cover, the impeller is fixed on the rotating shaft, a pump cavity is opened in the pump body, and the impeller is placed in the pump cavity;

[0008] The pump body is provided with an inlet ring at one side of the pump chamber, and an outlet at the other side of the pump chamber, wherein the cross section of the inlet ring is a circular ring structure; the impeller comprises a front cover plate and a rear cover plate, and the impeller is provided with an impeller chamber extending from one side of the front cover plate, wherein blades are provided in the impeller chamber, and an impeller flow channel is formed between two adjacent blades, and the impeller is provided with a flow channel outlet between the front cover plate and the rear cover plate, wherein the impeller flow channel is communicated with the flow channel outlet, and the flow channel outlet is matched with the outlet;

[0009] A liquid inlet is arranged at one side of the impeller chamber, and a liquid inlet ring is arranged at the periphery of the liquid inlet in the impeller chamber, and the liquid inlet ring is matched with the inlet ring.

[0010] In one of the embodiments, the radial clearance t1 of the first clearance fitting structure formed by the flow channel outlet and the outlet portion is 0.5-1 mm.

[0011] In one of the embodiments, the radial clearance t2 of the second clearance fitting structure formed by the liquid inlet ring portion and the inlet ring portion is 0.3-0.5 mm.

[0012] In one of the embodiments, the inlet ring portion is provided with an inlet groove, a sealing ring is arranged in the inlet groove, and the sealing ring is matched with the inlet ring portion.

[0013] In one of the embodiments, the inner side wall of the sealing ring is provided with a serration portion.

[0014] In one embodiment, the sawtooth portion has a sawtooth length of 3 to 6 mm and a sawtooth height of 2 to 4 mm.

[0015] In one embodiment, a water inlet is provided on one side of the pump body, and a water outlet is provided on the other side of the pump body. The impeller divides the pump body into a water inlet chamber and a water outlet chamber. The water inlet is connected to the water inlet chamber, and the water outlet chamber is connected to the water outlet. The cross-section of the water outlet chamber is circular or pear-shaped.

[0016] In one of the embodiments, a limiting ring groove is opened in the middle of the impeller, a clamping hole is opened at the end of the limiting ring groove, one end of the rotating shaft is placed in the limiting ring groove, a positioning hole is opened at one end of the rotating shaft, the impeller is fixed to one end of the rotating shaft by a nut, and the nut passes through the clamping hole and is placed in the positioning hole.

[0017] In one embodiment, the rotating shaft is fixed on the pump cover through a first bearing seat and a second bearing seat and extends into the pump chamber. The first bearing seat and the second bearing seat are respectively arranged at two ends of the pump cover.

[0018] In one of the embodiments, the rotating shaft is provided with a shaft extension end portion, and the shaft extension end portion protrudes out of the pump cover for connection with an external driving motor.

[0019] To sum up, the utility model is a centrifugal pump device with a double seal structure, through the outlet portion provided on the inner side of the pump chamber of the pump body, cooperates with the flow channel outlet provided on the impeller between the front cover plate and the rear cover plate to form a first gap matching structure; combined with the inlet ring portion provided on the outer side of the pump chamber of the pump body, cooperates with the liquid inlet ring portion provided on the periphery of the liquid inlet of the impeller chamber to form a second gap matching structure, so that when the centrifugal pump device is running, the external water flows from the water inlet to the liquid inlet without flowing into the centrifugal pump device through the gap between the liquid inlet ring portion and the inlet ring portion, and prevents the water flowing out of the flow channel outlet from flowing back into the cavity surrounded by the outer wall of the impeller and the inner wall of the pump body through the gap between the flow channel outlet and the outlet portion, thereby effectively improving the volumetric efficiency of the centrifugal pump device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural cross-sectional view of a centrifugal pump device with a double seal structure of the utility model (the arrow indicates the direction of water flow);

[0021] Figure 2 This is a schematic diagram of the structure of the impeller of the utility model;

[0022] Figure 3 It is a partial enlarged view of A of a centrifugal pump device with a double seal structure of the utility model;

[0023] Figure 4 It is a partial enlarged view of B of a centrifugal pump device with a double seal structure of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the sealing ring of the utility model.

[0025] The symbols in the figure represent:

[0026] 10. Pump body; 101. Water inlet; 102. Inlet ring; 1021. Sealing ring; 1022. Sawtooth portion; 103. Outlet portion; 11. Water inlet chamber; 12. Water outlet chamber; 20. Pump cover; 30. Impeller; 31. Front cover plate; 32. Rear cover plate; 33. Impeller chamber; 331. Liquid inlet; 34. Blades; 35. Impeller flow channel; 36. Flow channel outlet; 37. Liquid inlet ring; 301. Limiting ring groove; 302. Clamping hole; 303. Nut; 40. Rotating shaft; 41. Shaft extension end; 42. Positioning hole; 50. Pump cavity; 60. First bearing seat; 70. Second bearing seat. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figures 1 to 5 As shown, the utility model is a centrifugal pump device with a double seal structure, including a pump body 10, a pump cover 20, an impeller 30 and a rotating shaft 40. A water inlet 101 is arranged on one side of the pump body 10, and a water outlet (not shown) is arranged on the other side of the pump body 10; the pump body 10 and the pump cover 20 are arranged in a transverse docking manner, the impeller 30 is fixedly arranged at one end of the rotating shaft 40, a pump cavity 50 is opened in the pump body 10, the rotating shaft 40 is fixed in the pump cover 20 through a first bearing seat 60 and a second bearing seat 70, and extends into the pump cavity 50, so that the impeller 30 is placed in the pump cavity 50, and the rotating shaft 40 is provided with a shaft extension end 41, and the shaft extension end 41 protrudes out of the pump cover 20, so as to facilitate the connection with an external drive motor.

[0031] The impeller 30 divides the pump body 10 into an inlet chamber 11 and an outlet chamber 12, the inlet port 101 is connected to the inlet chamber 11, and the outlet chamber 12 is connected to the outlet port; the pump body 10 is provided with an inlet ring portion 102 on one side of the pump chamber 50, and the pump body 10 is provided with an outlet portion 103 on the other side of the pump chamber 50, and the outlet portion 103 is connected to the outlet chamber 12, and the cross section of the inlet ring portion 102 is a circular ring structure. The impeller 30 includes a front cover plate 31 and a rear cover plate 32 arranged in parallel. The cover plate 31 and the rear cover plate 32 are both annular structures. The impeller 30 is provided with an impeller chamber 33 extending from one side of the front cover plate 31. Blades 34 are provided in the impeller chamber 33. An impeller flow channel 35 is formed between two adjacent blades 34. In this embodiment, the number of blades 34 is designed to be 4 to 7. The impeller 30 is provided with a flow channel outlet 36 between the front cover plate 31 and the rear cover plate 32. The impeller flow channel 35 is connected to the flow channel outlet 36. The flow channel outlet 36 is matched with the outlet portion 103. That is, the flow channel outlet 36 and the outlet part 103 form a first clearance fitting structure, thereby forming a first sealing structure of the centrifugal pump equipment. Through the first clearance fitting structure, the external water of the centrifugal pump equipment can efficiently flow out from the water outlet of the centrifugal pump equipment through the flow channel outlet 36 of the impeller 30. In addition, the water flowing out from the flow channel outlet 36 will not flow back into the cavity surrounded by the outer wall of the impeller 30 and the inner wall of the pump body 10 through the gap between the flow channel outlet 36 and the outlet part 103, which can effectively reduce the external water flow carrying impurities into the cavity surrounded by the outer wall of the impeller 30 and the inner wall of the pump body 10, reduce volume loss and mechanical wear, and reduce the axial force of the product; in this embodiment, the radial clearance t1 of the first clearance fitting structure is 0.5~1mm, which effectively avoids the situation that the water flowing out from the flow channel outlet 36 flows back into the centrifugal pump equipment through the gap between the flow channel outlet 36 and the outlet part 103, thereby ensuring the sealing performance of the centrifugal pump equipment of the utility model.

[0032] A liquid inlet 331 is provided on one side of the impeller chamber 33, and a liquid inlet ring portion 37 is provided on the periphery of the liquid inlet 331 of the impeller chamber 33. The liquid inlet ring portion 37 is matched with the inlet ring portion 102, and the liquid inlet ring portion 37 and the inlet ring portion 102 form a second gap matching structure, thereby forming a second sealing structure of the centrifugal pump equipment. Through the second gap matching structure, water outside the centrifugal pump equipment can efficiently enter the impeller chamber 33 through the liquid inlet 331, and then flow out from the water outlet of the centrifugal pump equipment through subsequent flow; in this embodiment, the radial gap t2 of the second gap matching structure is 0.3~0.5mm, which effectively avoids the situation that the external water will not flow into the centrifugal pump equipment through the gap between the liquid inlet ring portion 37 and the inlet ring portion 102 during the process of flowing from the water inlet 101 to the liquid inlet 331, thereby improving the sealing performance of the centrifugal pump equipment of the utility model.

[0033] The utility model adopts a double sealing structure through a first gap matching structure and a second gap matching structure, so that when the centrifugal pump equipment is in operation, the external water flows through the water inlet 101 to the liquid inlet 331 and will not flow into the centrifugal pump equipment through the gap between the liquid inlet ring portion 37 and the inlet ring portion 102. In addition, it is prevented that the water flowing out of the flow channel outlet 36 flows back into the cavity surrounded by the outer wall of the impeller 30 and the inner wall of the pump body 10 through the gap between the flow channel outlet 36 and the outlet portion 103, so that there is no waste in the process of external water flowing into the pump cavity 50 through the water inlet 101 and then being transported out of the pump cavity 50 through the impeller 30, thereby effectively improving the volumetric efficiency of the centrifugal pump equipment.

[0034] During the rotation of the impeller 30, the second sealing structure formed by the liquid inlet ring portion 37 and the inlet ring portion 102 will cause the wear of the inlet ring portion 102 structure, and the pump body 10 is manufactured in an integrated manner. The wear of the inlet ring portion 102 causes the entire pump body 10 to be replaced, which generates a large replacement cost and is not conducive to the service life of the centrifugal pump equipment. Therefore, the design is adopted in the following manner: the inlet ring portion 102 is provided with an inlet groove, and a sealing ring 1021 is arranged in the inlet groove. The sealing ring 1021 is matched with the inlet ring portion 102, that is, the sealing ring 1021 and the inlet ring portion 102 form a second clearance matching structure; the sealing ring 1021 is fixed in the pump body 10 by screws. By setting the sealing ring 1021 structure, the wear of the inlet ring portion 102 by the impeller 30 becomes the wear of the sealing ring 1021 by the impeller 30, and the replacement of the sealing ring 1021 alone can further reduce the use cost of the centrifugal pump equipment.

[0035] In one embodiment, a serration portion 1022 is provided on the inner wall of the sealing ring 1021, and the serration portion 1022 is composed of 8 to 10 serrations. In this embodiment, the length of the serration a=3 to 6 mm, and the height of the serration b=2 to 4 mm. The serration portion 1022 structure greatly reduces the volume loss of the centrifugal pump equipment, and at the same time can reduce the friction risk between the impeller 30 and the sealing ring 1021, thereby effectively improving the hydraulic efficiency and service life of the centrifugal pump equipment.

[0036] In one embodiment, the cross-section of the water outlet chamber 12 is circular or pear-shaped, thereby increasing the flow velocity of water in the pump body 10 and thereby effectively improving the hydraulic efficiency of the centrifugal pump equipment.

[0037] In one embodiment, a limiting ring groove 301 is opened in the middle of the impeller 30, and a clamping hole 302 is opened at the end of the limiting ring groove 301 of the impeller 30. One end of the rotating shaft 40 is placed in the limiting ring groove 301, and a positioning hole 42 is opened at one end of the rotating shaft 40. The impeller 30 is fixed to one end of the rotating shaft 40 through a nut 303, and the nut 303 passes through the clamping hole 302 and is placed in the positioning hole 42, so that the impeller 30 is firmly fixed on the rotating shaft 40, and then the impeller 30 is driven to rotate through the rotating shaft 40.

[0038] In one embodiment, the first bearing seat 60 and the second bearing seat 70 are respectively arranged at the two ends of the pump cover 20, so as to firmly fix the rotating shaft 40 in the pump cover 20; a first bearing is arranged in the first bearing seat 60, and a second bearing is arranged in the second bearing seat 70, and the rotating shaft 40 passes through the first bearing and the second bearing.

[0039] When the utility model is working, the external drive motor is connected to the shaft extension end 41 at one end of the rotating shaft 40 through the coupling, the rotating shaft 40 rotates to drive the impeller 30 to rotate synchronously, and the liquid outside the equipment enters the pump chamber 50 through the water inlet 101. In the process of the external liquid entering the pump chamber 50, the second gap matching structure formed by the liquid inlet ring part 37 and the inlet ring part 102 can effectively avoid the situation that the external water will not flow into the centrifugal pump equipment through the gap between the liquid inlet ring part 37 and the inlet ring part 102 during the process of flowing from the water inlet 101 to the liquid inlet 331; the water entering the pump chamber 50 enters the impeller 30 through the liquid inlet 331, and under the rotation of the impeller 30, it passes through the impeller The flow channel 35 and the flow channel outlet 36 enter into the water outlet chamber 12. After the external liquid enters into the water outlet chamber 12, the first gap matching structure formed by the flow channel outlet 36 and the outlet portion 103 can effectively reduce the external water flow carrying impurities into the cavity surrounded by the outer wall of the impeller 30 and the inner wall of the pump body 10. Through the double sealing structure, when the centrifugal pump equipment is in operation, the external water flow will not flow into the centrifugal pump equipment through the gap between the liquid inlet ring portion 37 and the inlet ring portion 102 during the process of flowing from the flow channel outlet 36 to the liquid inlet 331, and the water flowing out from the flow channel outlet 36 will be prevented from flowing back into the centrifugal pump equipment through the gap between the flow channel outlet 36 and the outlet portion 103, thereby effectively improving the volumetric efficiency of the centrifugal pump equipment.

[0040] In summary, the utility model is a centrifugal pump device with a double seal structure, through the outlet portion 103 provided on the inner side of the pump chamber 50 of the pump body 10, cooperates with the flow channel outlet 36 provided between the front cover plate 31 and the rear cover plate 32 of the impeller 30 to form a first gap matching structure; combined with the inlet ring portion 102 provided on the outer side of the pump chamber 50 of the pump body 10, cooperates with the liquid inlet ring portion 37 provided on the periphery of the liquid inlet 331 of the impeller chamber 33 to form a second gap matching structure, so that when the centrifugal pump device is in operation, the external water flows through the water inlet 101 to the liquid inlet 331 and will not flow into the centrifugal pump device through the gap between the liquid inlet ring portion 37 and the inlet ring portion 102, and prevents the water flowing out of the flow channel outlet 36 from flowing back into the cavity surrounded by the outer wall of the impeller 30 and the inner wall of the pump body 10 through the gap between the flow channel outlet 36 and the outlet portion 103, thereby effectively improving the volumetric efficiency of the centrifugal pump device.

[0041] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A centrifugal pump device with a double seal structure, characterized in that: It comprises a pump body, a pump cover, an impeller and a rotating shaft, wherein the pump body is docked with the pump cover, the rotating shaft is fixed in the pump cover, the impeller is fixed on the rotating shaft, a pump cavity is opened in the pump body, and the impeller is placed in the pump cavity; The pump body is provided with an inlet ring at one side of the pump chamber, and an outlet at the other side of the pump chamber, wherein the cross section of the inlet ring is a circular ring structure; the impeller comprises a front cover plate and a rear cover plate, and the impeller is provided with an impeller chamber extending from one side of the front cover plate, wherein blades are provided in the impeller chamber, and an impeller flow channel is formed between two adjacent blades, and the impeller is provided with a flow channel outlet between the front cover plate and the rear cover plate, wherein the impeller flow channel is communicated with the flow channel outlet, and the flow channel outlet is matched with the outlet; A liquid inlet is arranged at one side of the impeller chamber, and a liquid inlet ring is arranged at the periphery of the liquid inlet in the impeller chamber, and the liquid inlet ring is matched with the inlet ring.

2. A centrifugal pump device with a double seal structure according to claim 1, characterized in that: The radial clearance t1 of the first clearance matching structure formed by the flow channel outlet and the outlet portion is 0.5-1 mm.

3. A centrifugal pump device with a double seal structure according to claim 1, characterized in that: The radial clearance t2 of the second clearance matching structure formed by the liquid inlet ring portion and the inlet ring portion is 0.3-0.5 mm.

4. A centrifugal pump device with a double seal structure according to claim 1, characterized in that: The inlet ring portion is provided with an inlet groove, a sealing ring is arranged in the inlet groove, and the sealing ring is matched with the inlet ring portion.

5. A centrifugal pump device with a double seal structure according to claim 4, characterized in that: The inner side wall of the sealing ring is provided with a serration portion.

6. A centrifugal pump device with a double seal structure according to claim 5, characterized in that: The sawtooth portion has a sawtooth length of 3 to 6 mm and a sawtooth height of 2 to 4 mm.

7. A centrifugal pump device with a double seal structure according to claim 1, characterized in that: A water inlet is arranged on one side of the pump body, and a water outlet is arranged on the other side of the pump body. The impeller divides the pump body into a water inlet chamber and a water outlet chamber. The water inlet is connected to the water inlet chamber, and the water outlet chamber is connected to the water outlet. The cross-section of the water outlet chamber is circular or pear-shaped.

8. The centrifugal pump device with a double seal structure according to claim 1, characterized in that: A limiting ring groove is provided in the middle of the impeller, a clamping hole is provided at the end of the limiting ring groove, one end of the rotating shaft is placed in the limiting ring groove, a positioning hole is provided at one end of the rotating shaft, the impeller is fixed to one end of the rotating shaft by a nut, and the nut passes through the clamping hole and is placed in the positioning hole.

9. The centrifugal pump device with a double seal structure according to claim 1, characterized in that: The rotating shaft is fixed on the pump cover through a first bearing seat and a second bearing seat and extends into the pump cavity. The first bearing seat and the second bearing seat are respectively arranged at two ends of the pump cover.

10. The centrifugal pump device with a double seal structure according to claim 1, characterized in that: The rotating shaft is provided with a shaft extension end portion, and the shaft extension end portion protrudes out of the pump cover and is used for connecting with an external driving motor.

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