Screw pump with laminated shaft seal structure

Abstract

The utility model discloses a screw pump with a laminated shaft seal structure, which relates to the technical field of screw pumps and comprises a screw pump body, a driving screw is arranged at one end of the screw pump body, one end of the screw pump body provided with the driving screw is connected with a bearing seat, one side of the bearing seat is movably connected with a sealing gland, and the other side of the bearing seat is provided with a shaft seal. A plurality of groups of sealing base plates are arranged between the sealing gland and the bearing seat in a stacked mode, the whole effective sealing time is prolonged by multiple times by adopting the multiple shaft seals to be used alternately, shaft seal materials can be selected, the shaft seals made of different materials are adopted, and the medium adaptability and the sealing effect can be more superior and more obvious. By means of the sealing gasket, the shaft seal can be adjusted on the premise that general assembly parts such as a motor and a coupler do not need to be disassembled, maintenance operation is simplified, and maintenance cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of screw pump technology, and specifically to a screw pump with a stacked shaft seal structure. Background Technology

[0002] In general conveying machinery, mechanical seals or shaft seals are usually used to seal the medium. In the conventional screw pump seal design, a mechanical seal or a shaft seal is generally used to seal the conveyed medium. However, since the seal is a vulnerable part, it will inevitably wear down after a period of operation. This will lead to a decrease in the sealing effect and even leakage, which will cause problems for the normal use of the screw pump.

[0003] Under the existing single-seal structure, seal failure generally precedes the failure of the screw pump itself. Therefore, in practical applications, seal failure leading to media leakage is common, requiring manufacturers to replace the seal to resolve the leakage problem. Sometimes, due to other factors such as operating environment, usage conditions, and operating requirements, the seal's service life does not meet the warranty requirements, also necessitating seal replacement. During seal replacement, the seal gland needs to be removed from the shaft head before the seal can be replaced. However, on the screw pump unit, the screw pump shaft head is equipped with a coupling, which connects to the prime mover. Therefore, when replacing the seal, the prime mover needs to be removed from the unit, and the coupling also needs to be removed from the shaft head to complete the seal replacement. This process is time-consuming, labor-intensive, and not conducive to rapid response in the field. Utility Model Content

[0004] The purpose of this invention is to provide a screw pump with a stacked shaft seal structure to solve the problems mentioned in the background art.

[0005] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0006] A screw pump with a stacked shaft seal structure includes a screw pump body, one end of which is provided with a drive screw, and the end of the screw pump body with the drive screw is connected to a bearing housing. A sealing cover is movably connected to one side of the bearing housing, and several sets of sealing gaskets are stacked between the sealing cover and the bearing housing.

[0007] The active screw also includes a first-step outer circle, a second-step outer circle, and a third-step outer circle. The diameters of the first-step outer circle, the second-step outer circle, and the third-step outer circle gradually decrease from the end near the bearing seat to the end of the sealing cover. The sealing cover has a first inner hole, a second inner hole, and a third inner hole. A large shaft seal is installed inside the first inner hole, a middle shaft seal is installed inside the second inner hole, and a small shaft seal is installed inside the third inner hole. The inner diameters of the large shaft seal, the middle shaft seal, and the small shaft seal are respectively matched with the diameters of the first-step outer circle, the second-step outer circle, and the third-step outer circle.

[0008] As a further embodiment of this utility model, the diameters of the first inner hole, the second inner hole, and the third inner hole are equal.

[0009] As a further embodiment of this utility model, the diameters of the first inner hole, the second inner hole, and the third inner hole decrease sequentially.

[0010] As a further embodiment of this utility model: the bearing housing and the sealing gland are located on the outside of the active screw, and the sealing gasket is crescent-shaped and symmetrically distributed on the outside of the sealing gland.

[0011] As a further embodiment of this utility model: a number of sets of screws are provided on the side of the sealing cover away from the sealing gasket, and the screws pass through the sealing cover and the sealing gasket in sequence to be movably connected to the bearing seat.

[0012] As a further embodiment of this utility model: an O-ring groove is provided around the outer side of the sealing cover, an O-ring is provided inside the O-ring groove, and the outer surface of the O-ring is in contact with the inner surface of the bearing seat.

[0013] As a further embodiment of this utility model: a bearing is provided inside the bearing housing, and the inner surface of the bearing is in contact with the outer surface of the driving screw.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model uses multiple shaft seals that are used alternately and in rotation, which increases the overall effective sealing time by several times;

[0016] 2. This utility model uses multiple shaft seals to be installed at the same time, and the shaft seal materials can be selected. That is, shaft seals of different materials can be installed at one time. In some complex working conditions, the adaptability of the medium and the sealing effect of shaft seals of different materials will be more advantageous and obvious.

[0017] 3. This utility model, through the setting of the sealing gasket, allows the adjustment of the shaft seal to be carried out without disassembling the motor, coupling and other assembly components, simplifying maintenance operations and saving maintenance costs. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the small shaft seal of this utility model when it performs a sealing function;

[0021] Figure 3 This is a schematic diagram of the structure of the central shaft seal of this utility model when it performs a sealing function;

[0022] Figure 4 This is a schematic diagram of the structure of the large shaft seal of this utility model when it performs the sealing function;

[0023] Figure 5 This is a schematic diagram of the structure of the active screw of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the sealing gland of this utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the sealing gasket of this utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of the third embodiment of this utility model;

[0028] Figure 10 This is a schematic diagram of the fourth embodiment of the present invention.

[0029] In the diagram: 1. Screw pump body; 2. Drive screw; 3. Bearing housing; 4. Sealing gland; 5. Sealing gasket; 6. Large shaft seal; 7. Middle shaft seal; 8. Small shaft seal; 9. Screw; 10. O-ring groove; 11. O-ring; 12. Bearing. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] like Figure 1-7As shown, a screw pump with a stacked shaft seal structure includes a screw pump body 1, a drive screw 2 is provided at one end of the screw pump body 1, the drive screw 2 is used to fix the coupling, a bearing seat 3 is connected to the end of the screw pump body 1 where the drive screw 2 is provided, a sealing cover 4 is movably connected to one side of the bearing seat 3, the bearing seat 3 and the sealing cover 4 are located outside the drive screw 2, and a number of sealing gaskets 5 are stacked between the sealing cover 4 and the bearing seat 3. The sealing gaskets 5 are crescent-shaped and symmetrically distributed on the outside of the sealing cover 4.

[0033] The active screw 2 also includes a first-step outer circle 21, a second-step outer circle 22, and a third-step outer circle 23. The diameters of the first-step outer circle 21, the second-step outer circle 22, and the third-step outer circle 23 gradually decrease from the end near the bearing seat 3 to the end of the sealing cover 4. The sealing cover 4 has a first inner hole 41, a second inner hole 42, and a third inner hole 43. The diameters of the first inner hole 41, the second inner hole 42, and the third inner hole 43 are equal or can decrease sequentially. A large shaft seal 6 is installed inside the first inner hole 41, a middle shaft seal 7 is installed inside the second inner hole 42, and a small shaft seal 8 is installed inside the third inner hole 43. The inner diameters of the large shaft seal 6, the middle shaft seal 7, and the small shaft seal 8 are respectively matched with the diameters of the first-step outer circle 21, the second-step outer circle 22, and the third-step outer circle 23.

[0034] Several sets of screws 9 are provided on the side of the sealing cover 4 away from the sealing gasket 5. The screws 9 pass through the sealing cover 4 and the sealing gasket 5 in sequence and are movably connected to the bearing seat 3. The sealing cover 4 and the sealing gasket 5 are fixed on the bearing seat 3 by the screws 9, which forms a good radial seal for the whole device.

[0035] An O-ring groove 10 is provided around the outer side of the sealing gland 4. An O-ring 11 is provided inside the O-ring groove 10. The outer surface of the O-ring 11 is in contact with the inner surface of the bearing housing 3. The O-ring 11 forms a good radial seal between the bearing housing 3 and the sealing gland 4.

[0036] The bearing housing 3 is equipped with a bearing 12. The inner surface of the bearing 12 is in contact with the outer surface of the drive screw 2. The bearing 12 limits the drive screw 2 and reduces the friction of the drive screw 2 when it rotates, thereby reducing the wear of the drive screw 2 and providing good protection for the drive screw 2.

[0037] like Figure 2As shown, this is the initial working state of the device. Under the pressure of the sealing gland 4, the small shaft seal 8 is installed on the outer circle 23 of the third step of the active screw 2 that it mates with. The sealing fit formed between the two can seal the conveyed medium. At this time, the large shaft seal 6 and the middle shaft seal 7 are respectively distributed on the outer sides of the outer circles 22 of the second step and 23 of the third step of the active screw 2. The inner diameters of the large shaft seal 6 and the middle shaft seal 7 are both larger than the outer diameter of their mating circles. Therefore, in Figure 4 As shown, the large shaft seal 6 and the middle shaft seal 7 do not perform a sealing function; only the small shaft seal 8 performs a sealing function.

[0038] like Figure 3 As shown, after a certain period of operation, when the inner hole of the small shaft seal 8 wears down and can no longer provide a seal, the screw 9 can be loosened to remove the set of symmetrically distributed sealing gaskets 5 closest to the bearing housing 3. Since the sealing gaskets 5 are crescent-shaped, the screw 9 only needs to be moved beyond the set of symmetrically distributed sealing gaskets 5 closest to the bearing housing 3 to remove the sealing gaskets 5 without removing the sealing cover 4 from the shaft head for adjustment. Then, the screw 9 is tightened again. At this time, the sealing cover 4 is displaced to one side, causing the middle shaft seal 7 to be installed on the second step outer circle 22 of the driving screw 2 that it mates with. The sealing fit formed by the two can seal the conveyed medium. At this time, the large shaft seal 6 is distributed outside the second step outer circle 22 of the driving screw 2. The inner diameter of the large shaft seal 6 is larger than the outer diameter of the outer circle that it mates with. The small shaft seal 8 has lost its sealing function due to the wear of its inner hole. Therefore, in Figure 5 As shown, the large shaft seal 6 and the small shaft seal 8 do not perform a sealing function; only the middle shaft seal 7 performs a sealing function.

[0039] like Figure 4 As shown, when the inner hole of the middle shaft seal 7 is also worn and cannot perform the sealing function, the above operation is repeated. The sealing cover 4 is displaced to one side again so that the large shaft seal 6 is installed on the outer circle 21 of the first step of the active screw 2 that it cooperates with. At this time, the middle shaft seal 7 and the small shaft seal 8 do not perform the sealing function, and only the large shaft seal 6 performs the sealing function.

[0040] Example 2

[0041] like Figure 8 As shown, when the device is in use, the small shaft seal 8 can be installed on the outside of the sealing cover 4. The small shaft seal 8 also serves to seal during the initial operation of the device. The sealing cover 4 is equipped with a large shaft seal 6 and a middle shaft seal 7. The number of sealing gaskets 5 is the same as in Embodiment 1. When the small shaft seal 8 wears down and can no longer seal, the middle shaft seal 7 is activated to seal. When the middle shaft seal 7 wears down and can no longer seal, the large shaft seal 6 is activated. The operation of activating each shaft seal is the same as in Embodiment 1.

[0042] Example 3

[0043] like Figure 9 As shown, when the device is in use, two types of shaft seals can be used to achieve a stacked sealing structure. That is, a large shaft seal 6 and a medium shaft seal 7 are set inside the sealing gland 4. At this time, the number of sealing gaskets 5 decreases by one set. The relationship between the number of sealing gaskets 5 and the number of shaft seals is that the number of shaft seals decreases by one set. The medium shaft seal 7 plays a sealing role when the device is initially working. When the medium shaft seal 7 does not play a sealing role and the large shaft seal 6 is used, the operation is the same as above. This form is also a commonly used form in actual production.

[0044] Example 4

[0045] like Figure 10 As shown, based on Embodiment 3, the middle shaft seal 7 is installed on the outside of the sealing cover 4 to form another type of shaft seal with two specifications to achieve a stacked sealing structure. The number of sealing gaskets 5 is the same as in Embodiment 3. When the middle shaft seal 7 fails to seal, the large shaft seal 6 is activated to seal, just like in Embodiment 3.

[0046] The working principle of this utility model is as follows: During use, several different inner holes are opened on the sealing gland 4 to install shaft seals of different specifications or materials. Simultaneously, several different stepped outer circles are designed on the drive screw 2 to cooperate with the shaft seals for sealing the conveyed medium. Several sealing gaskets 5 are installed between the sealing gland 4 and the bearing seat 3. When the screw pump body 1 starts working, the small shaft seal 8 is used to seal the medium. When the small shaft seal 8 fails, the middle shaft seal 7 can be used to seal the medium. When the middle shaft seal 7 fails, the large shaft seal 6 is finally used to seal the medium. This extends the sealing time of the medium several times, meeting user requirements. Furthermore, all operations can be completed without disassembling the motor and coupling, simplifying operation and maintenance during later use, reducing the workload of operators, and saving user operating costs.

[0047] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A screw pump with a stacked shaft seal structure, comprising a screw pump body (1); characterized in that: One end of the screw pump body (1) is provided with an active screw (2), and the end of the screw pump body (1) with the active screw (2) is connected to a bearing seat (3). A sealing cover (4) is movably connected to one side of the bearing seat (3), and several sets of sealing gaskets (5) are stacked between the sealing cover (4) and the bearing seat (3). The active screw (2) also includes a first stepped outer circle (21), a second stepped outer circle (22), and a third stepped outer circle (23). The diameters of the first stepped outer circle (21), the second stepped outer circle (22), and the third stepped outer circle (23) gradually decrease from the end near the bearing seat (3) to the end of the sealing cap (4). The sealing cap (4) has a first inner hole (41), a second inner hole (42), and a third inner hole (43). A large shaft seal (6) is provided inside the first inner hole (41), a middle shaft seal (7) is provided inside the second inner hole (42), and a small shaft seal (8) is provided inside the third inner hole (43). The inner diameters of the large shaft seal (6), the middle shaft seal (7), and the small shaft seal (8) are respectively matched with the diameters of the first stepped outer circle (21), the second stepped outer circle (22), and the third stepped outer circle (23).

2. A screw pump having a laminated shaft seal structure according to claim 1, characterized by The first inner hole (41), the second inner hole (42), and the third inner hole (43) have the same diameter.

3. A screw pump having a laminated shaft seal structure according to claim 2, characterized in that, The diameters of the first inner hole (41), the second inner hole (42), and the third inner hole (43) decrease sequentially.

4. The screw pump having a laminated shaft seal structure according to claim 1, characterized by The bearing housing (3) and the sealing cap (4) are located on the outside of the active screw (2), and the sealing gasket (5) is crescent-shaped and is symmetrically distributed on the outside of the sealing cap (4).

5. The screw pump having a laminated shaft seal structure according to claim 1, characterized by The sealing cover (4) is provided with several sets of screws (9) on the side away from the sealing gasket (5). The screws (9) pass through the sealing cover (4) and the sealing gasket (5) in sequence and are movably connected to the bearing seat (3).

6. A screw pump having a laminated shaft seal structure according to claim 1, characterized by The outer side of the sealing cap (4) is provided with an O-ring groove (10), and an O-ring (11) is provided inside the O-ring groove (10). The outer surface of the O-ring (11) is in contact with the inner surface of the bearing seat (3).

7. A screw pump having a laminated shaft seal structure according to claim 1, characterized by The bearing housing (3) is provided with a bearing (12) inside, and the inner surface of the bearing (12) is in contact with the outer surface of the drive screw (2).

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