Centrifugal pump

Abstract

The centrifugal pump comprises a pump shell, an impeller and a transmission shaft, the impeller is coaxially and rotatably installed in the pump shell, one end of the transmission shaft penetrates into the pump shell from the first side face of the pump shell and is in transmission connection with the impeller, a water inlet is formed in the second side face of the pump shell, and a water outlet is formed in the other end of the transmission shaft. The water inlet and the transmission shaft are located on the two sides of the pump shell respectively and are coaxially arranged, and a water outlet pipe is communicated with fluid on the peripheral face of the pump shell. The transmission shaft and the water inlet are formed in the two sides of the pump shell correspondingly, only the transmission shaft side needs to be sealed, the number of sealing layers is reduced, a gap is formed between the transmission shaft and the cylinder body, water can be effectively prevented from entering the cylinder body, the impeller can be supported by arranging the sealing copper ring, the rotating precision is improved, and the sealing copper ring is used for sealing the impeller. Collision abrasion between the impeller and the inner wall of the water inlet in the pump shell can be avoided, the abrasion loss of the impeller and the pump shell can be reduced, and therefore the service life is prolonged.

Description

Technical Field

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

[0002] A centrifugal pump is a pump that transports liquid by rotating the impeller and generating centrifugal force. In road cleaning vehicles, in order to save space, the transmission part and the water inlet of the centrifugal pump group are usually integrated on the same side of the pump head. The transmission part needs to be well sealed, and multiple seals are generally used, which will increase the cost. In actual use, water will inevitably enter the transmission part of the pump group, causing the transmission part to rust. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to provide a centrifugal pump which can prevent moisture from entering the driving components.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a centrifugal pump, comprising a pump casing, an impeller and a transmission shaft, wherein the impeller is coaxially rotatably installed in the pump casing, one end of the transmission shaft penetrates into the pump casing from a first side surface of the pump casing and is transmission-connected to the impeller, a water inlet is provided on the second side surface of the pump casing, the water inlet and the transmission shaft are respectively located on both sides of the pump casing and are coaxially arranged, and a water outlet pipe is provided on the outer peripheral surface of the pump casing for fluid conduction.

[0005] In the above-mentioned centrifugal pump, a sealing copper ring is coaxially installed in the water inlet, and the side of the impeller close to the sealing copper ring extends into the sealing copper ring to form a positioning support platform, and the outer wall of the positioning support platform is in contact with the inner wall of the sealing copper ring.

[0006] In the centrifugal pump, an annular groove is provided on the outer circumferential surface of the sealing copper ring along its circumferential direction, and more than two annular grooves are provided on the outer circumferential surface of the sealing copper ring in the axial direction of the sealing copper ring.

[0007] The above-mentioned centrifugal pump has a sealing hole coaxially opened on the first side surface of the pump casing, one end of the transmission shaft passes through the sealing hole and penetrates into the pump casing, a mechanical seal assembly is sealingly installed in the sealing hole, the mechanical seal assembly is coaxially installed on the transmission shaft, and the mechanical seal assembly is sealingly fitted between the sealing hole and the transmission shaft; a pin hole is opened on the first side surface of the pump casing, a spring cylindrical pin is fixedly connected in the pin hole, the end of the spring cylindrical pin is connected to the first end of the mechanical seal assembly, a gap is provided between the impeller and the inner wall surface of the pump casing, the second end of the mechanical seal assembly passes through the gap and abuts against the side wall surface of the impeller.

[0008] In the above-mentioned centrifugal pump, the sealing hole includes a first circular hole segment, a second circular hole segment and a tapered hole segment which are sequentially connected along the pump casing from the outside to the inside, the aperture of the first circular hole segment is smaller than the aperture of the second circular hole segment, the small diameter end of the tapered hole segment is connected to the second circular hole segment, and the aperture of the small diameter end of the tapered hole segment is larger than the aperture of the second circular hole segment, and the large diameter end of the tapered hole segment passes through the inner wall surface of the pump casing; the mechanical seal assembly includes a first sleeve, a second sleeve, a sealing ring and a spring, the first sleeve and the second sleeve are both sleeved on the transmission shaft, the first end of the first sleeve is inserted into the first circular hole segment and is sealed with the first circular hole segment, and a pin hole is opened on the end surface of the first sleeve, and the spring cylindrical pin passes through the inner wall surface of the pump casing. The pin hole is inserted into the pin hole, and the second sleeve is fixedly connected to the transmission shaft by a set screw; a groove is opened on the inner side surface of the first sleeve, one end of the groove passes through the second end of the first sleeve, the sealing ring is sleeved on the transmission shaft, and the sealing ring is located in the groove, the depth of the groove is less than the thickness of the sealing ring, the first end of the second sleeve is close to the first sleeve, and the second end of the second sleeve is fitted with the side wall of the impeller, a spring is connected to the first end of the second sleeve, and a pressure ring is connected to the other end of the spring, and the pressure ring is tightly fitted on the sealing ring, and a retaining ring is coaxially fixedly connected to the first end of the second sleeve, and the retaining ring is sleeved on the second end of the first sleeve.

[0009] The above-mentioned centrifugal pump, the pump casing includes a casing seat and a sealing cover, one end of the transmission shaft passes through the casing seat, the sealing cover is buckled on the casing seat, the edge of the casing seat and the edge of the sealing cover are fixedly connected by bolts; a pump chamber is formed between the casing seat and the sealing cover, and the impeller is installed in the pump chamber.

[0010] In the centrifugal pump, a drainage hole is provided at a position close to the ground on the bottom of the sealing cover, and a screw is installed in the drainage hole; the water inlet is provided on the side wall of the sealing cover, and the water outlet pipe is provided on the outer peripheral surface of the sealing cover along the tangent direction of the sealing cover. By providing the drainage hole, water in the pump body can be discharged when the temperature is low, so as to prevent the water in the pump body from freezing and causing damage to the pump body.

[0011] In the above centrifugal pump, a fixing mechanism is provided on one side of the pump housing where the transmission shaft is mounted, and an end of the transmission shaft passes through the fixing mechanism and is rotatably connected in the fixing mechanism.

[0012] The above-mentioned centrifugal pump, the fixing mechanism includes a barrel, an end cover and a pulley, one end of the transmission shaft passes through the barrel and is fixedly connected to the pulley, and the transmission shaft is coaxially arranged with the barrel, a support rib is formed on one end of the barrel close to the pump casing, the other end of the support rib is connected to the pump casing, the end cover is sealingly fixedly installed on the other end of the barrel, a bearing is installed in the barrel, the transmission shaft passes through the bearing, sealing rings are sealed in both ends of the barrel, the sealing ring sealing sleeve is on the transmission shaft, an oil cup hole and an air vent are opened on the side of the barrel facing away from the ground, the oil cup hole is connected to an oil cup, and the air vent is connected to a breathable screw plug.

[0013] In the above centrifugal pump, a balancing hole is provided on the impeller, the balancing hole penetrates the impeller along the axial direction of the impeller, and the distance between the balancing hole and the impeller axis is smaller than the inner diameter of the water inlet.

[0014] The technical solution of the utility model has achieved the following beneficial technical effects:

[0015] 1. By arranging the transmission shaft and the water inlet on both sides of the pump casing respectively, it is only necessary to seal the transmission shaft side, reducing the number of sealing layers, and there is a gap between the transmission shaft and the cylinder body, which can effectively prevent moisture from entering the cylinder body.

[0016] 2. When the impeller rotates at high speed, due to the influence of the processing and manufacturing accuracy and assembly accuracy of the bearing, transmission shaft and related components, the impeller will produce a certain degree of radial runout. By setting a sealing copper ring, the impeller can be supported, its radial runout can be reduced, and the rotation accuracy can be improved; the use of a sealing copper ring can avoid collision and wear between the impeller and the inner wall of the water inlet on the pump casing, and the hardness of the sealing copper ring is lower than that of the impeller and the pump casing, which can reduce the wear of the impeller and the pump casing, thereby increasing the service life; by setting a ring groove, the elasticity of the sealing copper ring is increased, so that the impeller has a small amount of floating space.

[0017] 3. By setting the sealing hole and the matching mechanical sealing assembly, the sealing performance between the transmission shaft and the pump housing can be always maintained, further avoiding water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural schematic diagram of the utility model;

[0019] Figure 2 A schematic diagram of the cross-sectional structure of the utility model;

[0020] Figure 3 A schematic diagram of the mechanical seal assembly of the utility model being matched with the sealing hole;

[0021] Figure 4A side structural schematic diagram of the utility model;

[0022] Figure 5 A schematic structural diagram of a sealing copper ring of the utility model.

[0023] The reference numerals in the figure are as follows: 1-pump housing; 101-sealing cover; 102-housing seat; 103-drain hole; 2-water outlet pipe; 3-fixing mechanism; 301-barrel; 302-end cover; 303-oil cup hole; 304-air vent; 305-bearing; 306-sealing ring; 307-pulley; 4-water inlet; 5-impeller; 501-balance hole; 6-sealing copper ring; 601-ring groove; 7-transmission Moving shaft; 8-locking nut; 9-mechanical seal assembly; 901-first sleeve; 902-groove; 903-sealing ring; 904-second sleeve; 905-retaining ring; 906-spring; 907-setting screw; 10-support rib; 11-spring cylindrical pin; 12-pump seat; 13-positioning support platform; 14-sealing hole; 141-first circular hole section; 142-second circular hole section; 143-taper hole section. DETAILED DESCRIPTION

[0024] A centrifugal pump in this embodiment, such as Figure 1-2 As shown, it includes a pump casing 1, an impeller 5 and a transmission shaft 7. The impeller 5 is coaxially rotatably installed in the pump casing 1. One end of the transmission shaft 7 penetrates into the pump casing 1 from a first side surface of the pump casing 1 and is transmission-connected to the impeller 5. A water inlet 4 is provided on the second side surface of the pump casing 1. The water inlet 4 and the transmission shaft 7 are respectively located on both sides of the pump casing 1 and are coaxially arranged. An outlet pipe 2 is provided on the outer peripheral surface of the pump casing 1 for fluid conduction.

[0025] like Figure 2 As shown, the pump housing 1 includes a housing seat 102 and a sealing cover 101, one end of the transmission shaft 7 passes through the housing seat 102, the sealing cover 101 is buckled on the housing seat 102, and the edge of the housing seat 102 and the edge of the sealing cover 101 are fixedly connected by bolts; a pump chamber is formed between the housing seat 102 and the sealing cover 101, and the impeller 5 is installed in the pump chamber.

[0026] like Figure 2 As shown, a drainage hole 103 is provided on the bottom of the sealing cover 101 close to the ground, and a screw is installed in the drainage hole 103; the water inlet 4 is provided on the side wall of the sealing cover 101, and the water outlet pipe 2 is arranged on the outer peripheral surface of the sealing cover 101 along the tangent direction of the sealing cover 101.

[0027] like Figure 2 , Figure 5As shown, a sealing copper ring 6 is coaxially installed in the water inlet 4, and the side of the impeller 5 close to the sealing copper ring 6 extends into the sealing copper ring 6 to form a positioning support platform 13, and the outer wall of the positioning support platform 13 is in contact with the inner wall of the sealing copper ring 6; an annular groove 601 is provided on the outer peripheral surface of the sealing copper ring 6 along its circumference, and in the axial direction of the sealing copper ring 6, more than two annular grooves 601 are provided on the outer peripheral surface of the sealing copper ring 6.

[0028] like Figure 4 As shown, a balancing hole 501 is opened on the impeller 5 , and the balancing hole 501 penetrates the impeller 5 along the axial direction of the impeller 5 , and the distance between the balancing hole 501 and the axis of the impeller 5 is smaller than the inner diameter of the water inlet 4 .

[0029] like Figure 2-3 As shown, a sealing hole 14 is coaxially opened on the first side surface of the pump casing 1, one end of the transmission shaft 7 passes through the sealing hole 14 and penetrates into the pump casing 1, a mechanical sealing assembly 9 is sealingly installed in the sealing hole 14, the mechanical sealing assembly 9 is coaxially installed on the transmission shaft 7, and the mechanical sealing assembly 9 is sealingly fitted between the sealing hole 14 and the transmission shaft 7; a pin hole is opened on the first side surface of the pump casing 1, a spring cylindrical pin 11 is fixedly connected in the pin hole, the end of the spring cylindrical pin 11 is connected to the first end of the mechanical sealing assembly 9, there is a gap between the impeller 5 and the inner wall surface of the pump casing 1, the second end of the mechanical sealing assembly 9 passes through the gap and abuts against the side wall surface of the impeller 5.

[0030] like Figure 3As shown, the sealing hole 14 includes a first circular hole segment 141, a second circular hole segment 142 and a tapered hole segment 143 which are sequentially connected along the pump housing 1 from the outside to the inside, the aperture of the first circular hole segment 141 is smaller than the aperture of the second circular hole segment 142, the small diameter end of the tapered hole segment 143 is connected to the second circular hole segment 142, and the aperture of the small diameter end of the tapered hole segment 143 is larger than the aperture of the second circular hole segment 142, and the large diameter end of the tapered hole segment 143 passes through the inner wall surface of the pump housing 1; the mechanical seal assembly 9 includes a first sleeve 901, a second sleeve 904, a sealing ring 903 and a spring 906, the first sleeve 901 and the second sleeve 904 are both sleeved on the transmission shaft 7, the first end of the first sleeve 901 is inserted into the first circular hole segment 141 and is sealed with the first circular hole segment 141, and a pin hole is opened on the end surface of the first sleeve 901, and the spring cylindrical pin 11 passes through the pin hole on the pump housing 1 And inserted into the pin hole, the second sleeve 904 is fixedly connected to the transmission shaft 7 by a set screw 907; a groove 902 is provided on the inner side surface of the first sleeve 901, one end of the groove 902 passes through the second end of the first sleeve 901, the sealing ring 903 is sleeved on the transmission shaft 7, and the sealing ring 903 is located in the groove 902, the depth of the groove 902 is less than the thickness of the sealing ring 903, the first end of the second sleeve 904 is close to the first sleeve 901, and the second end of the second sleeve 904 is in contact with the side wall of the impeller 5, a spring 906 is connected to the first end of the second sleeve 904, and a pressure ring is connected to the other end of the spring 906, and the pressure ring is tightly fitted on the sealing ring 903, and a retaining ring 905 is coaxially fixedly connected to the first end of the second sleeve 904, and the retaining ring 905 is sleeved on the second end of the first sleeve 901.

[0031] like Figure 1-2As shown, a fixing mechanism 3 is provided on one side of the pump housing 1 on which the transmission shaft 7 is installed, and the end of the transmission shaft 7 passes through the fixing mechanism 3 and is rotatably connected in the fixing mechanism 3, and the fixing mechanism 3 includes a barrel 301, an end cover 302 and a pulley 307, one end of the transmission shaft 7 passes through the barrel 301 and is fixedly connected to the pulley 307, and the transmission shaft 7 is coaxially arranged with the barrel 301, and a support rib 10 is formed on one end of the barrel 301 close to the pump housing 1, and the other end of the support rib 10 is connected to the pump housing 1 The end cover 302 is sealed and fixedly installed on the other end of the barrel 301, a bearing 305 is installed in the barrel 301, the transmission shaft 7 passes through the bearing 305, sealing rings 306 are sealed in both ends of the barrel 301, the sealing ring 306 is sealed on the transmission shaft 7, and an oil cup hole 303 and an air vent 304 are provided on the side of the barrel 301 facing away from the ground. By providing the oil cup hole 303 and the air vent 304, lubricating oil can be easily added to the barrel 301, which is convenient for maintenance.

[0032] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A centrifugal pump, comprising a pump casing (1) and an impeller (5), wherein the impeller (5) is coaxially rotatably mounted in the pump casing (1), characterized in that: It also includes a transmission shaft (7), one end of which penetrates into the pump casing (1) from the first side surface of the pump casing (1) and is in driving connection with the impeller (5); a water inlet (4) is provided on the second side surface of the pump casing (1); the water inlet (4) and the transmission shaft (7) are respectively located on two sides of the pump casing (1) and are coaxially arranged; and a water outlet pipe (2) is provided on the outer peripheral surface of the pump casing (1) for fluid conduction.

2. A centrifugal pump according to claim 1, characterized in that: A sealing copper ring (6) is coaxially installed in the water inlet (4); a side of the impeller (5) close to the sealing copper ring (6) extends into the sealing copper ring (6) to form a positioning support platform (13); and an outer wall of the positioning support platform (13) is in contact with an inner wall of the sealing copper ring (6).

3. A centrifugal pump according to claim 2, characterized in that: An annular groove (601) is provided on the outer circumferential surface of the sealing copper ring (6) along its circumferential direction. In the axial direction of the sealing copper ring (6), more than two annular grooves (601) are provided on the outer circumferential surface of the sealing copper ring (6).

4. A centrifugal pump according to claim 1, characterized in that: A sealing hole (14) is coaxially provided on the first side surface of the pump housing (1), one end of the transmission shaft (7) passes through the sealing hole (14) and penetrates into the pump housing (1), a mechanical sealing assembly (9) is sealingly installed in the sealing hole (14), the mechanical sealing assembly (9) is coaxially installed on the transmission shaft (7), and the mechanical sealing assembly (9) is sealingly fitted between the sealing hole (14) and the transmission shaft (7); a pin hole is provided on the first side surface of the pump housing (1), a spring cylindrical pin (11) is fixedly connected in the pin hole, the end of the spring cylindrical pin (11) is connected to the first end of the mechanical sealing assembly (9), a gap is provided between the impeller (5) and the inner wall surface of the pump housing (1), the second end of the mechanical sealing assembly (9) passes through the gap and abuts against the side wall surface of the impeller (5).

5. A centrifugal pump according to claim 4, characterized in that: The sealing hole (14) comprises a first circular hole section (141), a second circular hole section (142) and a tapered hole section (143) which are sequentially connected from the outside to the inside of the pump housing (1); the aperture of the first circular hole section (141) is smaller than the aperture of the second circular hole section (142); the small diameter end of the tapered hole section (143) is connected to the second circular hole section (142); the small diameter end of the tapered hole section (143) has a larger aperture than the aperture of the second circular hole section (142); and the large diameter end of the tapered hole section (143) penetrates the inner wall surface of the pump housing (1); The mechanical seal assembly (9) comprises a first sleeve (901), a second sleeve (904), a sealing ring (903) and a spring (906); the first sleeve (901) and the second sleeve (904) are both sleeved on the transmission shaft (7); the first end of the first sleeve (901) is inserted into the first circular hole section (141) and is sealed with the first circular hole section (141); a pin hole is provided on the end surface of the first sleeve (901); the spring cylindrical pin (11) passes through the pin hole on the pump housing (1) and is inserted into the pin hole; the second sleeve (904) is fixedly connected to the transmission shaft (7) by a set screw (907); a groove (902) is provided on the inner side surface of the first sleeve (901); one end of the groove (902) passes through the first sleeve (901) and is inserted into the pin hole. The second end of the cylinder (901), the sealing ring (903) is sleeved on the transmission shaft (7), and the sealing ring (903) is located in the groove (902), the depth of the groove (902) is less than the thickness of the sealing ring (903), the first end of the second sleeve (904) is close to the first sleeve (901), the second end of the second sleeve (904) is in contact with the side wall of the impeller (5), the first end of the second sleeve (904) is connected to a spring (906), the other end of the spring (906) is connected to a pressure ring, the pressure ring is tightly fitted on the sealing ring (903), the first end of the second sleeve (904) is coaxially fixedly connected to a retaining ring (905), the retaining ring (905) is sleeved on the second end of the first sleeve (901).

6. A centrifugal pump according to claim 1, characterized in that: The pump housing (1) comprises a housing seat (102) and a sealing cover (101); one end of the transmission shaft (7) passes through the housing seat (102); the sealing cover (101) is buckled onto the housing seat (102); the edge of the housing seat (102) and the edge of the sealing cover (101) are fixedly connected by bolts; a pump chamber is formed between the housing seat (102) and the sealing cover (101); and the impeller (5) is installed in the pump chamber.

7. A centrifugal pump according to claim 6, characterized in that: A drainage hole (103) is provided on the bottom of the sealing cover (101) at a position close to the ground, and a screw is installed in the drainage hole (103); the water inlet (4) is provided on the side wall of the sealing cover (101), and the water outlet pipe (2) is arranged on the outer peripheral surface of the sealing cover (101) along the tangent direction of the sealing cover (101).

8. A centrifugal pump according to claim 1, characterized in that: A fixing mechanism (3) is provided on one side of the pump housing (1) where the transmission shaft (7) is mounted, and an end of the transmission shaft (7) passes through the fixing mechanism (3) and is rotatably connected in the fixing mechanism (3).

9. A centrifugal pump according to claim 8, characterized in that: The fixing mechanism (3) comprises a barrel (301), an end cover (302) and a pulley (307); one end of the transmission shaft (7) passes through the barrel (301) and is fixedly connected to the pulley (307); the transmission shaft (7) and the barrel (301) are coaxially arranged; a support rib (10) is formed on one end of the barrel (301) close to the pump casing (1); the other end of the support rib (10) is connected to the pump casing (1); the end cover (302) is sealed and fixedly mounted on the barrel ( The cylinder body (301) is provided with a bearing (305) on the other end thereof, the transmission shaft (7) passes through the bearing (305), sealing rings (306) are provided in sealing manner at both ends of the cylinder body (301), the sealing rings (306) are sealingly sleeved on the transmission shaft (7), an oil cup hole (303) and an air vent (304) are provided on the side of the cylinder body (301) facing away from the ground, the oil cup hole (303) is connected to an oil cup, and the air vent (304) is connected to an air vent screw plug.

10. A centrifugal pump according to claim 1, characterized in that: The impeller (5) is provided with a balancing hole (501), the balancing hole (501) penetrates the impeller (5) along the axial direction of the impeller (5), and the distance between the balancing hole (501) and the axis of the impeller (5) is smaller than the inner diameter of the water inlet (4).

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