Mixed-flow pump with high sealing effect

Abstract

The mixed-flow pump with the high sealing effect comprises a pump shell, one end of the pump shell is fixedly connected with a fixing plate, a two-step stepped hole is formed in the middle of the fixing plate, a second rotating shaft is arranged in the stepped hole in a penetrating and inserting mode, and the second rotating shaft is sleeved with a sealing ring and an O-shaped ring. The O-shaped ring and the second rotating shaft are both sleeved on the smaller shaft section of the second rotating shaft, the sealing ring is located on the inner end face of the stepped hole, the O-shaped ring is in contact with the inner wall of the smaller hole of the stepped hole, the smaller shaft section of the second rotating shaft extends into the pump shell and is fixedly connected with an impeller, and the side wall of one end of the impeller is just in transition fit with the water inlet of the pump shell. According to the invention, the sealing effect can be improved along with the increase of the load.

Description

Technical Field

[0001] The invention relates to the technical field of mixed flow pumps, and in particular to a mixed flow pump with high sealing effect. Background Art

[0002] A mixed flow pump is a type of pump between a centrifugal pump and an axial flow pump. The specific speed of a mixed flow pump is higher than that of a centrifugal pump and lower than that of an axial flow pump, generally between 300 and 500. Its head is higher than that of an axial flow pump, but its flow rate is smaller than that of an axial flow pump and larger than that of a centrifugal pump. When the prime mover drives the impeller to rotate, the liquid is acted upon by both centrifugal force and axial thrust, which is a combination of a centrifugal pump and an axial flow pump, and the liquid flows out of the impeller obliquely.

[0003] The transmission shaft of the existing mixed flow pump basically limits axial movement to prevent the generated axial force from damaging the motor. At the same time, to improve the sealing effect, most of them are equipped with multiple sealing gaskets on the transmission shaft, and the sealing effect does not change with the load of the mixed flow pump. Therefore, under high load of the mixed flow pump, the risk of water leakage increases. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a mixed flow pump with high sealing effect, including a pump housing, one end of the pump housing is fixedly connected to a fixing plate, a second-step stepped hole is arranged in the middle of the fixing plate, and a second rotating shaft is inserted in the stepped hole, a sealing ring and an O-ring are sleeved on the second rotating shaft, and both are sleeved on the smaller shaft section of the second rotating shaft, the sealing ring is located at the inner end face of the stepped hole, and the O-ring contacts the inner wall of the smaller hole of the stepped hole. Since the mixed flow pump generates axial force when working and can cause the transmission shaft to move axially, the existing mixed flow pump basically limits the axial movement of the transmission shaft, and in this scheme, a second rotating shaft that can move the rotating shaft is provided, and when working, the second rotating shaft moves to buckle the sealing ring, and as the load increases, the greater the axial force generated, the greater the force on the sealing ring, which can improve the sealing effect.

[0005] The smaller shaft section of the second rotating shaft extends to the inside of the pump housing and is fixedly connected to an impeller, and a side wall of one end of the impeller is just transitionally fitted in the water inlet of the pump housing. The impeller rotates to transport water, and the matching arrangement with the water inlet reduces the backflow of water, that is, the water in the pump housing passes through the gap between the impeller and the water inlet and returns to the water inlet.

[0006] Preferably, the mixed flow pump further comprises a first rotating shaft, wherein the first rotating shaft and the second rotating shaft are spline-matched, and the second rotating shaft is axially slidable, so as to ensure that the second rotating shaft can also realize axial movement when the first rotating shaft transmits the power to the second rotating shaft.

[0007] Preferably, the first rotating shaft and the second rotating shaft are both sleeved with the same spring, and the ends of the spring respectively abut against the convex rings preset on the side walls of the first rotating shaft and the second rotating shaft. That is, the spring generates a pre-tightening force on the second rotating shaft, so that the second rotating shaft has an axial effect on the sealing ring, ensuring static sealing under no load.

[0008] Preferably, one side of the fixing plate is fixedly connected to a shaft bracket, and one end of the shaft bracket is provided with a plurality of first bolts, the first bolts are threadedly engaged with the fixing plate, and the first rotating shaft is rotatably engaged with the shaft bracket, so as to realize position-limiting support for the first rotating shaft.

[0009] Preferably, a plurality of second bolts are inserted through the edge of the fixing plate, and the second bolts are threadedly connected to the pump housing to achieve fixed connection of the fixing plate.

[0010] Preferably, a sliding bearing sleeve is fixedly connected to the smaller hole of the stepped hole, a bearing bush is sleeved on the smaller shaft section of the second rotating shaft, and the bearing bush is slidably fitted inside the sliding bearing sleeve. The position of the bearing bush should be fixed at the center of gravity of the second rotating shaft and the impeller. Furthermore, a water tank is provided on the bearing bush, and a through hole is provided inside the smaller hole of the stepped hole, and the through hole is connected to the inside of the pump housing to achieve water cooling and lubrication of the bearing bush and the sliding bearing sleeve.

[0011] Preferably, a keyway is provided on the smaller shaft section of the second rotating shaft and inside the impeller, and a flat key is provided in the keyway to achieve the connection between the impeller and the second rotating shaft and ensure the rotation of the impeller.

[0012] Preferably, a baffle is provided at the end of the impeller, a third bolt is inserted through the end of the baffle, and the third bolt is threadedly connected to the second rotating shaft to prevent the impeller from axially moving and falling off the second rotating shaft.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. A second rotating shaft that can move axially is provided. When the impeller generates axial force during operation, the second shaft can press the sealing ring. The greater the load of the mixed flow pump, the greater the axial force generated, and the better the sealing effect of the sealing ring. The mixed flow pump has the advantage of improving the sealing effect as the load increases.

[0015] 2. A first rotating shaft and a spring are provided, and the first rotating shaft and the second rotating shaft are spline-matched to ensure the axial movement of the second rotating shaft, and the spring provides an initial axial force to ensure static sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the present invention from a side perspective;

[0017] Figure 2It is a three-dimensional schematic diagram of another side viewing angle of the present invention;

[0018] Figure 3 It is an explosion schematic diagram of the present invention;

[0019] Figure 4 It is a cross-sectional schematic diagram of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0021] List of reference numerals:

[0022] 1. First rotating shaft; 2. Shaft support; 3. Pump casing; 4. Impeller; 5. First bolt; 6. Spring; 7. Second rotating shaft; 8. Sealing ring; 9. O-ring; 10. Second bolt; 11. Third bolt; 12. Baffle; 13. Flat key; 14. Sliding bearing sleeve; 15. Bearing shell; 16. Fixing plate. DETAILED DESCRIPTION

[0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] like Figures 1 to 5 As shown, a mixed flow pump with high sealing effect includes a pump housing 3, and its structure is consistent with that of a traditional mixed flow pump. One end of the pump housing 3 is fixedly connected to a fixing plate 16, and a two-step stepped hole is arranged in the middle of the fixing plate 16. Further, a cylindrical rod is integrally formed in the middle of the fixing plate 16, and the stepped hole is arranged in the middle of the rod, and a second rotating shaft 7 is interspersed in the stepped hole. It can be understood here that the second rotating shaft 7 has no axial restriction, and a sealing ring 8 and an O-ring 9 are sleeved on the second rotating shaft 7, and both are sleeved on the smaller shaft section of the second rotating shaft 7. The sealing ring 8 is located at the inner end face of the stepped hole. It can be understood that when the second rotating shaft 7 moves, the sealing ring 8 can be pressed, and the O-ring 9 contacts the inner wall of the smaller hole of the stepped hole. Here, the O-ring 9 is used for static sealing, and two seals ensure the sealing performance.

[0025] The smaller shaft section of the second rotating shaft 7 extends to the interior of the pump casing 3 and is fixedly connected to the impeller 4. The second rotating shaft 7 drives the impeller 4 to rotate. The side wall at one end of the impeller 4 just transitions and fits into the water inlet of the pump casing 3 to reduce water backflow. Specifically, when the mixed flow pump is working, the internal water pressure of the pump casing 3 is high, and most of the water is sent out from the water outlet on the pump casing 3. At the same time, the water pressure at the water inlet of the pump casing 3 is low. Part of the water here passes through the gap between the impeller 4 and the pump casing 3 and flows back to the water inlet, causing losses.

[0026] The mixed flow pump also includes a first rotating shaft 1, which is spline-matched with a second rotating shaft 7, and the second rotating shaft 7 is axially slidable, that is, the first rotating shaft 1 and the second rotating shaft 7 are interlocked, while ensuring power, the axial movement of the second rotating shaft 7 is not affected.

[0027] The first rotating shaft 1 and the second rotating shaft 7 are both sleeved with the same spring 6, and the ends of the spring 6 respectively abut against the convex rings preset on the side walls of the first rotating shaft 1 and the second rotating shaft 7. That is, the spring 6 gives the second rotating shaft 7 an initial axial force, so that the second rotating shaft 7 buckles the sealing ring 8, providing the ability to achieve static sealing only under the action of the spring 6.

[0028] One side of the fixing plate 16 is fixedly connected with a shaft support 2, the shaft support 2 is conical, and a flange is provided at one end, and a plurality of first bolts 5 are inserted through one end of the shaft support 2, and the first bolts 5 are inserted through the flange, the first bolts 5 are threadedly engaged with the fixing plate 16, and the first rotating shaft 1 is rotatably engaged with the shaft support 2. The shaft support 2 is used to limit the axial movement of the first rotating shaft 1.

[0029] A plurality of second bolts 10 are interspersed on the edge of the fixing plate 16 , and the second bolts 10 are threadedly connected to the pump housing 3 , so as to be used for fixing the fixing plate 16 , and a sealing gasket is arranged between the fixing plate 16 and the pump housing 3 .

[0030] A sliding bearing sleeve 14 is fixedly connected to the smaller hole of the stepped hole, and a bearing bush 15 is sleeved on the smaller shaft section of the second rotating shaft 7. The bearing bush 15 is slidably fitted inside the sliding bearing sleeve 14 to support the second rotating shaft 7, while eliminating the setting of the bearing to prevent the bearing water corrosion from affecting the mixed flow pump. Furthermore, a water tank is provided on the bearing bush 15, that is, water can flow through the water tank to lubricate and cool the bearing bush 15 and the sliding bearing sleeve 14.

[0031] A keyway is provided on the smaller shaft section of the second rotating shaft 7 and inside the impeller 4, and a flat key 13 is provided in the keyway, which is a common connection mode between the shaft and the rotating part, ensuring that the impeller 4 rotates with the second rotating shaft 7.

[0032] The end of the impeller 4 is provided with a baffle 12, and the end of the baffle 12 is interspersed with a third bolt 11, and the third bolt 11 is threadedly connected with the second rotating shaft 7. The baffle 12 and the third bolt 11 prevent the impeller 4 from axially moving and falling off from the second rotating shaft 7.

[0033] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A mixed flow pump with high sealing effect, characterized in that: The pump housing (3) comprises a pump housing (3), one end of which is fixedly connected to a fixing plate (16), a second-step stepped hole is arranged in the middle of the fixing plate (16), a second rotating shaft (7) is inserted in the stepped hole, a sealing ring (8) and an O-ring (9) are sleeved on the second rotating shaft (7), and both are sleeved on the smaller shaft section of the second rotating shaft (7), the sealing ring (8) is located at the inner end surface of the stepped hole, and the O-ring (9) is in contact with the inner wall of the smaller hole of the stepped hole; The smaller shaft section of the second rotating shaft (7) extends to the interior of the pump casing (3) and is fixedly connected to an impeller (4), with a side wall at one end of the impeller (4) fitting exactly in transition with the water inlet of the pump casing (3).

2. A mixed flow pump with high sealing effect according to claim 1, characterized in that: The mixed flow pump further comprises a first rotating shaft (1), the first rotating shaft (1) and the second rotating shaft (7) are spline-matched, and the second rotating shaft (7) is axially slidably arranged.

3. A mixed flow pump with high sealing effect according to claim 2, characterized in that: The first rotating shaft (1) and the second rotating shaft (7) are both sleeved with the same spring (6), and the ends of the spring (6) respectively abut against convex rings preset on the side walls of the first rotating shaft (1) and the second rotating shaft (7).

4. A mixed flow pump with high sealing effect according to claim 3, characterized in that: One side of the fixing plate (16) is fixedly connected to a shaft support (2), and one end of the shaft support (2) is provided with a plurality of first bolts (5) inserted therethrough, the first bolts (5) being threadedly engaged with the fixing plate (16), and the first rotating shaft (1) being rotationally engaged with the shaft support (2).

5. A mixed flow pump with high sealing effect according to claim 1, characterized in that: A plurality of second bolts (10) are inserted through the edge of the fixing plate (16), and the second bolts (10) are threadedly connected to the pump casing (3).

6. A mixed flow pump with high sealing effect according to claim 1, characterized in that: A sliding bearing sleeve (14) is fixedly connected to the smaller hole of the stepped hole, a bearing bush (15) is sleeved on the smaller shaft section of the second rotating shaft (7), and the bearing bush (15) is slidably fitted inside the sliding bearing sleeve (14).

7. A mixed flow pump with high sealing effect according to claim 1, characterized in that: A keyway is provided on the smaller shaft section of the second rotating shaft (7) and inside the impeller (4), and a flat key (13) is provided in the keyway.

8. A mixed flow pump with high sealing effect according to claim 7, characterized in that: A baffle (12) is provided at the end of the impeller (4), a third bolt (11) is inserted through the end of the baffle (12), and the third bolt (11) is threadedly connected to the second rotating shaft (7).

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