Sealing structure of centrifugal pump

Abstract

The utility model discloses a sealing structure of a centrifugal pump, which relates to the technical field of centrifugal pumps, and comprises a washing area formed by a lining, a shaft sleeve and a first sealing element in a centrifugal pump main body in a surrounding manner, and a second sealing element sleeved on the shaft sleeve, the lip part of the second sealing element is arranged outside the first sealing element in a surrounding manner, so that a temporary storage area is jointly defined by the first sealing element, the second sealing element and the shaft sleeve, and the temporary storage area is communicated with the flushing area through a gap formed by dynamic sealing fit. Through the arrangement of the temporary storage area, on the basis that the flushing area exists, the temporary storage area and the flushing area are communicated through the gap between the sealing piece and the shaft sleeve, and the temporary storage area can store high-pressure liquid overflowing out of the flushing area, so that the high-pressure liquid cannot overflow to the ground to cause pollution, and the cleanliness of the working ground is guaranteed; and the requirements of workplaces on the environment are met.

Description

Technical Field

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

[0002] A centrifugal pump is a pump that transports liquid by the centrifugal force generated by the rotation of the impeller. Figure 1 The figure shows a cross-sectional structure diagram of a centrifugal pump in the prior art, wherein 101 represents the centrifugal pump body, 102 represents the drive shaft, 103 represents the impeller arranged on the drive shaft, 104 represents the bushing fixedly arranged on the inner side of the centrifugal pump body, 105 represents the shaft sleeve fixedly sleeved on the drive shaft, and the shaft sleeve and the bushing are connected by a spiral structure. The shaft sleeve and the bushing divide the interior of the centrifugal pump body into two left and right chambers. The impeller is located in the left chamber, and the right chamber is provided with a seal 106, and the seal is movable. Sleeved on the shaft sleeve, the seal is used to enclose a flushing area 107 between the shaft sleeve and the bushing. A flushing liquid inlet hole 108 is provided on the flushing area. When the centrifugal pump body is working, high-pressure liquid (generally set to water) is delivered to the flushing area through the flushing liquid inlet hole, so that the hydraulic pressure inside the flushing area is greater than the hydraulic pressure inside the left chamber, and then it is difficult for the material liquid inside the left chamber to overflow from the threaded structure between the shaft sleeve and the bushing to the inside of the flushing area, which also prevents the material liquid from entering the right chamber, thereby ensuring the normal operation of the centrifugal pump body.

[0003] However, due to the dynamic and static matching relationship between the seal and the sleeve, when the flushing area is in a high-pressure state, part of the high-pressure liquid inside the flushing area will overflow from the contact gap between the seal and the sleeve, and finally flow out through the through hole 109 on the centrifugal pump body to the work surface or the ground, causing inconvenience in use.

[0004] To this end, we propose a sealing structure for a centrifugal pump to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to solve the problems in the prior art and to propose a sealing structure for a centrifugal pump. In the sealing structure, a second sealing member is provided to form a temporary storage area, so that high-pressure liquid overflowing from the flushing area can be temporarily stored and processed in the temporary storage area. At the same time, by improving the structure of the first sealing member, the amount of high-pressure liquid overflowing from the flushing area is reduced. Combined with the above design, the working effect of the pump is significantly improved.

[0006] In order to solve the above problems, the present invention provides the following technical solutions:

[0007] A sealing structure for a centrifugal pump includes a flushing area formed by a sleeve, a shaft sleeve and a first seal inside a centrifugal pump body, and a dynamic seal is formed between the shaft sleeve and the first seal. The sealing structure also includes a second seal sleeved on the shaft sleeve, and the lip of the second seal is arranged outside the first seal, so that the first seal, the second seal and the shaft sleeve together form a temporary storage area, and the temporary storage area is connected to the flushing area through a gap formed by the dynamic seal.

[0008] As a further solution of the present invention: a water inlet and a water outlet are provided on the temporary storage area, the water inlet is used to transport liquid into the temporary storage area, and the water outlet is used to discharge the liquid inside the temporary storage area.

[0009] As a further solution of the present invention: a water outlet is provided at the bottom of the temporary storage area, and a collection tank is detachably installed at the water outlet, and a vent is opened on the temporary storage area for connecting the temporary storage area with the outside world.

[0010] As a further solution of the present invention: the first sealing member includes an outer sealing ring and an inner sealing ring, one end of the outer sealing ring is dynamically sealed on the shaft sleeve to form the dynamic sealing fit, the other end of the outer sealing ring is flared to cooperate with the shaft sleeve and the bushing to form the flushing area, the inner sealing ring dynamic sealing sleeve is arranged on the shaft sleeve, and an elastic member is arranged between the outer sealing ring and the inner sealing ring, the elastic member is used to cause the inner sealing ring to deform and fit tightly with the shaft sleeve.

[0011] As a further solution of the present invention: the outer sealing ring is flared, and the inner sealing ring is located inside the flared end of the outer sealing ring and is integrally formed with the outer sealing ring.

[0012] As a further solution of the present invention: a limiting block is provided between the first sealing member and the second sealing member, and the first sealing member, the second sealing member and the limiting block are connected by bolts.

[0013] As a further solution of the present invention: the elastic member is a spring, and both ends of the spring are fixedly connected to the inner side of the flared end of the outer sealing ring and the outer side of the inner sealing ring respectively.

[0014] As a further solution of the present invention: the flared end of the outer sealing ring is fixedly connected to the bushing by bolts.

[0015] As a further solution of the present invention: the mouth of the collection tank is provided with an external thread, the water outlet of the temporary storage area is provided with an internal thread, and the water outlet is connected to the collection tank through the internal and external threads.

[0016] As a further solution of the present invention: a flushing liquid inlet hole is provided on the flushing area.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the setting of the temporary storage area, on the basis of the existence of the flushing area, the temporary storage area and the flushing area are connected through the gap between the seal and the sleeve. The temporary storage area can store the high-pressure liquid overflowing from the flushing area, so that the high-pressure liquid will not overflow to the ground and cause pollution, ensuring the cleanliness of the working floor and meeting the environmental requirements of the workplace;

[0019] 2. By improving the conventional seal into the first seal, the elastic member can exert a pressing force on the inner seal ring on the first seal during use, so that the inner seal ring can be well and tightly fitted with the shaft sleeve, reducing the amount of high-pressure liquid that overflows from the flushing area through the gap to the temporary storage area;

[0020] 3. Through the setting of the water inlet and the water outlet, the water inlet is used to transport liquid into the temporary storage area, and the water outlet is used to discharge the liquid inside the temporary storage area. The simultaneous operation of the two can enable the liquid to carry the high-pressure liquid inside the temporary storage area away from the temporary storage area, so that the temporary storage area can continuously collect the high-pressure liquid overflowing from the flushing area, with good collection effect;

[0021] 4. By setting up the collection tank, the staff can periodically dump the collection tank full of high-pressure liquid. Compared with the water collection method of the combination of water inlet and outlet, this method saves resources and is in line with the company's concept of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the cross-sectional structure of a centrifugal pump in the prior art.

[0024] Figure 2 This is a schematic cross-sectional view of the first embodiment of the present invention;

[0025] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 4 This is a schematic cross-sectional view of the first sealing member in the first embodiment of the present invention;

[0027] Figure 5 This is a schematic cross-sectional view of the second embodiment of the present invention;

[0028] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0029] In the figure: 101, centrifugal pump body; 102, drive shaft; 103, impeller; 104, bushing; 105, sleeve; 106, seal; 107, flushing area; 108, flushing liquid inlet; 2, first seal; 201, outer sealing ring; 202, inner sealing ring; 3, second seal; 4, temporary storage area; 5, water inlet; 6, water outlet; 7, collection tank; 8, vent; 9, elastic member; 10, limit block. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figure 2 The centrifugal pump body 101 shown in the figure is provided with a drive shaft 102, an impeller 103, a bushing 104, a shaft sleeve 105, a seal 106, a flushing area 107, a flushing liquid inlet hole 108 and a through hole 109 in the same position and structure as those in the pump body of the prior art. The flushing area 107 is formed by the bushing 104, the shaft sleeve 105 and the seal 106 together inside the centrifugal pump body 101. Under this structure, the shaft sleeve 105 and the seal 106 are dynamically sealed.

[0032] Example 1:

[0033] like Figure 2-Figure 4 As shown, a sealing structure of a centrifugal pump includes the flushing area 107 mentioned above and a second seal 3 sleeved on the shaft sleeve 105. The lip of the second seal 3 is arranged around the outside of the seal 106, so that the seal 106, the second seal 3 and the shaft sleeve 105 together form a temporary storage area 4. The temporary storage area 4 is connected to the flushing area 107 through a gap formed by a dynamic seal. When the centrifugal pump body 101 is working normally, the high-pressure liquid inside the flushing area 107 will overflow from the gap into the temporary storage area 4 for storage. Compared with the technical solution in the prior art where the high-pressure liquid directly overflows to the ground, the present invention can store the high-pressure liquid overflowing from the flushing area 107 through the provision of the temporary storage area 4, and will not cause the high-pressure liquid to leak to the ground and cause pollution.

[0034] like Figure 3As shown, in order to continuously collect the high-pressure liquid inside the temporary storage area 4, a water inlet 5 and a water outlet 6 can be opened on the temporary storage area 4, and a water inlet hose (not shown in the figure) is connected to the water inlet 5. When in use, the water inlet 5 transports liquid (generally water) into the temporary storage area 4, and the water outlet 6 discharges the liquid inside the temporary storage area 4. The flow of this liquid will drive the high-pressure liquid to flow out of the temporary storage area 4, ensuring that the temporary storage area 4 can continuously collect high-pressure liquid and the collection effect is good.

[0035] like Figure 3-Figure 4 As shown, on the basis of the above-mentioned arrangement, in order to minimize the overflow of high-pressure liquid from the flushing area 107 into the temporary storage area 4, the present embodiment improves the seal 106 in the prior art, and arranges the seal 106 as a first seal 2 with the following structure. Specifically, the first seal 2 comprises an outer sealing ring 201 and an inner sealing ring 202. One end of the outer sealing ring 201 is dynamically sealed and sleeved on the shaft sleeve 105 to form a dynamic seal. The other end of the outer sealing ring 201 is flared to cooperate with the shaft sleeve 105 and the bushing 104 to form the flushing area 107. The inner sealing ring 202 is dynamically sealed and sleeved on the shaft sleeve 105. An elastic member 9 is arranged between the outer sealing ring 201 and the inner sealing ring 202. The elastic member 9 is used to deform the inner sealing ring 202 and fit tightly with the shaft sleeve 105. Preferably, the elastic member 9 is a spring, and both ends of the spring are fixedly connected to the inner side of the flared end of the outer sealing ring 201 and the outer side of the inner sealing ring 202 respectively. By utilizing the elastic action of the spring, a force can be continuously applied to the inner sealing ring 202, so that the inner sealing ring 202 fits tightly with the shaft sleeve 105, ensuring the sealing effect between the two, thereby reducing the high-pressure liquid overflowing from the flushing area 107 to the inside of the temporary storage area 4.

[0036] like Figure 4 As shown, the outer sealing ring 201 can be flared, and the inner sealing ring 202 is located inside the flared end of the outer sealing ring 201 and is integrally formed with the outer sealing ring 201. The flared end of the outer sealing ring 201 is fixedly connected to the bushing 104 by bolts.

[0037] Furthermore, in order to ensure the stability of the connection between the first seal 2 and the second seal 3, a limit block 10 can be set between the first seal 2 and the second seal 3, and the first seal 2, the second seal 3 and the limit block 10 are connected by bolts.

[0038] Example 2:

[0039] like Figure 5-Figure 6As shown, the difference between this embodiment and embodiment one is that this embodiment proposes a method for collecting high-pressure liquid that is different from embodiment one. Specifically: a water outlet 6 is provided at the bottom of the temporary storage area 4, and a collection tank 7 is detachably installed at the water outlet 6. A vent 8 is provided on the temporary storage area 4 for connecting the temporary storage area 4 with the outside world. When in use, the collection tank 7 can be used to temporarily store the high-pressure liquid. Subsequently, the staff only needs to periodically disassemble the collection tank 7 and pour out the high-pressure liquid inside it. This method does not require the setting of flowing water to drive the high-pressure liquid to flow out, saving water resources.

[0040] For the detachable connection between the collection tank 7 and the water outlet 6, the mouth of the collection tank 7 can be provided with an external thread, and the water outlet 6 of the temporary storage area 4 can be provided with an internal thread, and the water outlet 6 and the collection tank 7 can be connected by the internal and external threads. Of course, the detachable connection between the collection tank 7 and the water outlet 6 is not limited to the above-mentioned structure, and can also be provided by a buckle connection method in the prior art, as long as it can achieve the corresponding detachable effect.

[0041] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A sealing structure for a centrifugal pump, comprising a flushing area (107) formed by a bushing (104), a shaft sleeve (105) and a first sealing member (2) within a centrifugal pump body (101), wherein the shaft sleeve (105) and the first sealing member (2) are in dynamic sealing engagement, characterized in that: The sealing structure further comprises a second sealing member (3) sleeved on the shaft sleeve (105), and a lip portion of the second sealing member (3) is arranged around the outside of the first sealing member (2), so that the first sealing member (2), the second sealing member (3) and the shaft sleeve (105) are combined to form a temporary storage area (4), and the temporary storage area (4) and the flushing area (107) are connected through a gap formed by the dynamic seal.

2. The sealing structure of a centrifugal pump according to claim 1, characterized in that: The temporary storage area (4) is provided with a water inlet (5) and a water outlet (6), the water inlet (5) is used to transport liquid into the temporary storage area (4), and the water outlet (6) is used to discharge the liquid inside the temporary storage area (4).

3. The sealing structure of a centrifugal pump according to claim 1, characterized in that: A water outlet (6) is provided at the bottom of the temporary storage area (4), and a collection tank (7) is detachably mounted at the water outlet (6). A vent (8) is provided on the temporary storage area (4) for connecting the temporary storage area (4) with the outside world.

4. A sealing structure for a centrifugal pump according to claim 1, 2 or 3, characterized in that: The first sealing member (2) comprises an outer sealing ring (201) and an inner sealing ring (202); one end of the outer sealing ring (201) is dynamically sealed and sleeved on the shaft sleeve (105) to form the dynamic sealing fit; the other end of the outer sealing ring (201) is flared to cooperate with the shaft sleeve (105) and the bushing (104) to form the flushing area (107); the inner sealing ring (202) is dynamically sealed and sleeved on the shaft sleeve (105); and an elastic member (9) is provided between the outer sealing ring (201) and the inner sealing ring (202); the elastic member (9) is used to deform the inner sealing ring (202) so as to be in a tightly fitting state with the shaft sleeve (105).

5. The sealing structure of a centrifugal pump according to claim 4, characterized in that: The outer sealing ring (201) is flared, and the inner sealing ring (202) is located inside the flared end of the outer sealing ring (201) and is integrally formed with the outer sealing ring (201).

6. The sealing structure of a centrifugal pump according to claim 5, characterized in that: A limiting block (10) is provided between the first sealing member (2) and the second sealing member (3), and the first sealing member (2), the second sealing member (3) and the limiting block (10) are connected by bolts.

7. The sealing structure of a centrifugal pump according to claim 6, characterized in that: The elastic member (9) is a spring, and both ends of the spring are fixedly connected to the inner side of the flared end of the outer sealing ring (201) and the outer side of the inner sealing ring (202) respectively.

8. The sealing structure of a centrifugal pump according to claim 7, characterized in that: The flared end of the outer sealing ring (201) is fixedly connected to the bushing (104) via bolts.

9. The sealing structure of a centrifugal pump according to claim 3, characterized in that: The mouth of the collecting tank (7) is provided with an external thread, the water outlet (6) of the temporary storage area (4) is provided with an internal thread, and the water outlet (6) and the collecting tank (7) are connected via internal and external threads.

10. A sealing structure for a centrifugal pump according to claim 1, 2 or 3, characterized in that: The flushing area (107) is provided with a flushing liquid inlet hole (108).

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