Double-helix rotor pump sealing structure

Abstract

The utility model discloses a double-helix rotor pump sealing structure, and relates to the technical field of sealing structures. The double-helix rotor pump shell comprises a double-helix rotor pump shell and a bearing end cover, and the double-helix rotor pump shell and the bearing end cover are fixedly installed through a fixing screw rod. According to the utility model, through mutual movement between the sealing mother ring and the sealing son ring, the sealing mother ring and the sealing son ring can adaptively move due to enlargement of a gap between the double-helix rotor pump shell and the bearing end cover, and compared with a traditional sealing ring sealing mode, the sealing mother ring and the sealing son ring can adapt to gap change between the double-helix rotor pump shell and the bearing end cover after long-term use; gaps between the pump shell of the double-helix rotor pump and the sealing mother ring and gaps between the bearing end cover and the sealing son ring are sealed through the expansion packing in the annular grooves in the end faces of the pump shell of the double-helix rotor pump and the bearing end cover; the expanded expansion filler is tightly attached to the end faces of the sealing mother ring and the sealing son ring.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, and particularly relates to a sealing structure of a double-screw rotor pump. Background Art

[0002] A double-screw rotor pump mainly consists of two spiral rotors. These two rotors mesh with each other and rotate towards each other along the axial direction. One rotor is usually a constant main rotor, and the other is a slave rotor that starts rotating from one end of the shaft. The gap between the two rotors changes as the rotors rotate, and this characteristic is the key to realizing the suction and discharge functions of the pump.

[0003] When the double-screw rotor pump transports a liquid medium, the traditional sealing structure of the double-screw rotor pump often uses a sealing ring for end face sealing between the pump body and the end cover. When the gap between the end cover and the pump body increases after long-term use, liquid medium leakage will occur, which will in turn affect the cylinder pressure inside the double-screw rotor pump, and further lead to a reduction in the transportation efficiency of the double-screw rotor pump.

[0004] Therefore, a sealing structure of a double-screw rotor pump is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a sealing structure of a double-screw rotor pump to solve the problems raised in the above background art.

[0006] The utility model specifically adopts the following technical solutions to achieve the above purpose:

[0007] A sealing structure of a double-screw rotor pump includes a pump housing of the double-screw rotor pump and a bearing end cover. The pump housing of the double-screw rotor pump and the bearing end cover are fixedly installed through fixing screws. A bearing is inserted into the bearing end cover, and a double-screw rotor pump shaft is rotatably installed through the bearing inside the bearing end cover. Annular grooves are respectively formed on the end faces of the pump housing of the double-screw rotor pump and the bearing end cover, and expansion packing is filled in the annular grooves. A sealing female ring is fixedly installed on the end face of the pump housing of the double-screw rotor pump, and a sealing male ring is fixedly installed on the end face of the bearing end cover, and the sealing female ring and the sealing male ring are movably inserted.

[0008] Further, the sealing female ring includes a first sealing disc. The first sealing disc is attached to the end face of the pump housing of the double-screw rotor pump, and a first sealing convex ring is fixedly installed on one end face of the first sealing disc. A first sealing ring is fixedly installed on the other end face of the first sealing disc, and a first L-shaped sealing ring is fixedly installed on the end face of the first sealing ring. An annular groove is formed on the inner wall of the first sealing ring, and a support ring is installed in the annular groove.

[0009] Further, the sealing sub-ring includes a second sealing disc, the end face of the bearing end cover is attached with the second sealing disc, and a second sealing convex ring is fixedly installed on one end face of the second sealing disc. A second sealing ring is fixedly installed on the other end face of the second sealing disc, and a second L-shaped sealing ring is fixedly installed on the end face of the second sealing ring. An installation groove is formed on the outer surface of the second sealing ring, and an annular spring is arranged inside the installation groove.

[0010] Further, the second L-shaped sealing ring is movably inserted between the first sealing ring and the first L-shaped sealing ring.

[0011] Further, installation holes are formed on the end face of the double-screw rotor pump housing and the surface of the bearing end cover. Holes are formed on the surfaces of the first sealing disc and the second sealing disc. The first sealing disc is fixed to the end face of the double-screw rotor pump housing by bolts, and the second sealing disc is fixed to the end face of the bearing end cover by bolts.

[0012] Further, the first sealing disc is attached to the end face of the double-screw rotor pump housing, and the end face of the first sealing disc is in close contact with the expansion packing on the surface of the double-screw rotor pump housing. The second sealing disc is attached to the end face of the bearing end cover, and the end face of the second sealing disc is in close contact with the expansion packing on the surface of the bearing end cover.

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

[0014] By fixing the sealing mother ring to the end face of the double-screw rotor pump housing and the sealing sub-ring to the end face of the bearing end cover, the double-screw rotor pump shaft is rotatably installed through the bearing inside the bearing end cover. Through the mutual movable insertion between the sealing mother ring and the sealing sub-ring, the double-screw rotor pump housing and the bearing end cover are fixed by the fixing screw. Through the mutual movement between the sealing mother ring and the sealing sub-ring, it can adaptively move due to the increase in the gap between the double-screw rotor pump housing and the bearing end cover. Compared with the traditional sealing ring sealing method, it can adapt to the gap change between the double-screw rotor pump housing and the bearing end cover after long-term use. The expansion packing inside the annular groove on the end faces of the double-screw rotor pump housing and the bearing end cover seals the gaps between the double-screw rotor pump housing and the sealing mother ring, and between the bearing end cover and the sealing sub-ring. After the expansion packing expands when encountering the liquid medium, the expanded expansion packing is in close contact with the end faces of the sealing mother ring and the sealing sub-ring. Description of the Drawings

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 2 is a front sectional view of the present utility model;

[0017] Figure 3 is the present utility modelFigure 2 Enlarged view of part A;

[0018] Figure 4 is the Figure 2 enlarged view of part B of the present utility model;

[0019] Reference numerals: 1, double-screw rotor pump housing; 2, bearing end cover; 3, fixing screw; 4, double-screw rotor pump shaft; 5, annular groove; 51, expansion packing; 6, sealing mother ring; 601, first sealing disc; 602, first sealing convex ring; 603, first sealing ring; 604, first L-shaped sealing ring; 605, annular groove; 606, support ring; 7, sealing sub-ring; 701, second sealing disc; 702, second sealing convex ring; 703, second sealing ring; 704, second L-shaped sealing ring; 705, mounting groove; 706, annular spring. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model 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 a limitation to the present utility model.

[0024] Such as Figures 1 to 4As shown in the figure, a sealing structure of a double-screw rotor pump includes a double-screw rotor pump housing 1 and a bearing end cover 2. The double-screw rotor pump housing 1 and the bearing end cover 2 are fixedly installed through fixing screws 3. A bearing is inserted inside the bearing end cover 2, and a double-screw rotor pump shaft 4 is rotatably installed inside the bearing end cover 2 through the bearing. Annular grooves 5 are respectively formed on the end faces of the double-screw rotor pump housing 1 and the bearing end cover 2, and expansion packing 51 is filled inside the annular grooves 5. A sealing female ring 6 is fixedly installed on the end face of the double-screw rotor pump housing 1, and a sealing male ring 7 is fixedly installed on the end face of the bearing end cover 2, and the sealing female ring 6 and the sealing male ring 7 are movably inserted. More specifically, by fixing the sealing female ring 6 on the end face of the double-screw rotor pump housing 1 and the sealing male ring 7 on the end face of the bearing end cover 2, the double-screw rotor pump shaft 4 is rotatably installed through the bearing inside the bearing end cover 2. Through the mutual movable insertion between the sealing female ring 6 and the sealing male ring 7, the double-screw rotor pump housing 1 and the bearing end cover 2 are fixed through the fixing screws 3. Through the mutual movement between the sealing female ring 6 and the sealing male ring 7, it can adaptively move due to the increase in the gap between the double-screw rotor pump housing 1 and the bearing end cover 2. Compared with the traditional sealing ring sealing method, it can adapt to the gap change between the double-screw rotor pump housing 1 and the bearing end cover 2 after long-term use. The expansion packing 51 inside the annular grooves 5 on the end faces of the double-screw rotor pump housing 1 and the bearing end cover 2 seals the gaps between the double-screw rotor pump housing 1 and the sealing female ring 6, and between the bearing end cover 2 and the sealing male ring 7. After the expansion packing 51 expands when encountering the liquid medium, the expanded expansion packing 51 closely fits with the end faces of the sealing female ring 6 and the sealing male ring 7.

[0025] The sealing female ring 6 includes a first sealing disc 601. The first sealing disc 601 is attached to the end face of the double-screw rotor pump housing 1. One end face of the first sealing disc 601 is fixedly installed with a first sealing convex ring 602, and the other end face of the first sealing disc 601 is fixedly installed with a first sealing ring 603. The end face of the first sealing ring 603 is fixedly installed with a first L-shaped sealing ring 604. An annular groove 605 is formed on the inner wall of the first sealing ring 603, and a support ring 606 is installed inside the annular groove 605. More specifically, the first sealing disc 601 and the end face of the double-screw rotor pump housing 1 are fixed through fixing parts. The first sealing convex ring 602 on the end face of the first sealing disc 601 is inserted into the end face of the double-screw rotor pump housing 1, so as to seal between the first sealing disc 601 and the double-screw rotor pump housing 1. The support ring 606 is installed inside the annular groove 605 to support the first sealing ring 603.

[0026] The sealing sub-ring 7 includes a second sealing disc 701. The end face of the bearing end cover 2 is attached to the second sealing disc 701. And a second sealing convex ring 702 is fixedly installed on one end face of the second sealing disc 701, a second sealing ring 703 is fixedly installed on the other end face of the second sealing disc 701, and a second L-shaped sealing ring 704 is fixedly installed on the end face of the second sealing ring 703. An installation groove 705 is formed on the outer surface of the second sealing ring 703, and an annular spring 706 is arranged inside the installation groove 705. More specifically, the second sealing disc 701 is fixed to the end face of the bearing end cover 2 through a fixing member. The end faces of the second sealing disc 701 and the bearing end cover 2 are sealed by the second sealing convex ring 702 on the end face of the second sealing disc 701. The second L-shaped sealing ring 704 and the first L-shaped sealing ring 604 are movably inserted into each other. The annular spring 706 is inserted into the installation groove 705, so that the first sealing ring 603 and the first L-shaped sealing ring 604 are closely attached. The first L-shaped sealing ring 604 and the second L-shaped sealing ring 704 are movably inserted into each other, so that it can move adaptively along with the gap between the double-screw rotor pump housing 1 and the bearing end cover 2.

[0027] The second L-shaped sealing ring 704 is movably inserted between the first sealing ring 603 and the first L-shaped sealing ring 604. More specifically, the second L-shaped sealing ring 704 and the first L-shaped sealing ring 604 are inserted into each other, so as to seal the gap between the sealing mother ring 6 and the sealing sub-ring 7.

[0028] Installation holes are formed on the end face of the double-screw rotor pump housing 1 and the surface of the bearing end cover 2. Holes are formed on the surfaces of the first sealing disc 601 and the second sealing disc 701. And the first sealing disc 601 is fixed to the end face of the double-screw rotor pump housing 1 through bolts, and the second sealing disc 701 is fixed to the end face of the bearing end cover 2 through bolts. More specifically, the holes on the surfaces of the first sealing disc 601 and the second sealing disc 701 correspond to the installation holes on the end face of the double-screw rotor pump housing 1 and the end face of the bearing end cover 2 respectively, and the first sealing disc 601 and the second sealing disc 701 can be fixed through bolts.

[0029] The first sealing disc 601 is attached to the end face of the double-screw rotor pump housing 1, and the end face of the first sealing disc 601 is closely attached to the expansion packing 51 on the surface of the double-screw rotor pump housing 1. The second sealing disc 701 is attached to the end face of the bearing end cover 2, and the end face of the second sealing disc 701 is closely attached to the expansion packing 51 on the surface of the bearing end cover 2. More specifically, the end faces of the first sealing disc 601 and the double-screw rotor pump housing 1 and the second sealing disc 701 and the bearing end cover 2 are sealed through the expansion packing 51.

[0030] In summary: By fixing the sealing mother ring 6 to the end face of the double-screw rotor pump housing 1 and the sealing sub-ring 7 to the end face of the bearing end cover 2, the double-screw rotor pump shaft 4 is rotatably installed through the bearings inside the bearing end cover 2. Through the mutual movable insertion between the sealing mother ring 6 and the sealing sub-ring 7, the double-screw rotor pump housing 1 and the bearing end cover 2 are fixed by the fixing screw 3. Through the mutual movement between the sealing mother ring 6 and the sealing sub-ring 7, it can adaptively move due to the increase in the gap between the double-screw rotor pump housing 1 and the bearing end cover 2. Compared with the traditional sealing ring sealing method, it can adapt to the gap change between the double-screw rotor pump housing 1 and the bearing end cover 2 after long-term use. The expansion packing 51 inside the annular groove 5 on the end faces of the double-screw rotor pump housing 1 and the bearing end cover 2 seals the gaps between the double-screw rotor pump housing 1 and the sealing mother ring 6, and between the bearing end cover 2 and the sealing sub-ring 7. After the expansion packing 51 expands when encountering the liquid medium, the expanded expansion packing 51 closely fits the end faces of the sealing mother ring 6 and the sealing sub-ring 7.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A double helical rotor pump sealing structure, characterized in that: The invention comprises a double helical rotor pump casing (1) and a bearing end cover (2), wherein the double helical rotor pump casing (1) and the bearing end cover (2) are fixedly mounted via a fixing screw (3), a bearing is inserted into the interior of the bearing end cover (2), a double helical rotor pump shaft (4) is rotatably mounted inside the bearing end cover (2) via the bearing, an annular groove (5) is respectively formed on the end surface of the double helical rotor pump casing (1) and the end surface of the bearing end cover (2), and the interior of the annular groove (5) is filled with an expansion filler (51), a sealing mother ring (6) is fixedly mounted on the end surface of the double helical rotor pump casing (1), and a sealing sub-ring (7) is fixedly mounted on the end surface of the bearing end cover (2), and the sealing mother ring (6) and the sealing sub-ring (7) are movably plugged into each other.

2. A double helical rotor pump sealing structure according to claim 1, characterized in that: The sealing mother ring (6) comprises a first sealing disk (601), the end surface of the pump housing (1) of the double helical rotor pump is fitted with the first sealing disk (601), and a first sealing convex ring (602) is fixedly installed on one end surface of the first sealing disk (601), a first sealing ring (603) is fixedly installed on the other end surface of the first sealing disk (601), and a first L-shaped sealing ring (604) is fixedly installed on the end surface of the first sealing ring (603), and an annular groove (605) is provided on the inner wall of the first sealing ring (603), and a support ring (606) is installed inside the annular groove (605).

3. A double helical rotor pump sealing structure according to claim 2, characterized in that: The sealing sub-ring (7) comprises a second sealing disk (701), the end surface of the bearing end cover (2) is fitted with the second sealing disk (701), and a second sealing convex ring (702) is fixedly mounted on one end surface of the second sealing disk (701), a second sealing ring (703) is fixedly mounted on the other end surface of the second sealing disk (701), and a second L-shaped sealing ring (704) is fixedly mounted on the end surface of the second sealing ring (703), and an installation groove (705) is provided on the outer surface of the second sealing ring (703), and an annular spring (706) is arranged inside the installation groove (705).

4. A double helical rotor pump sealing structure according to claim 3, characterized in that: The second L-shaped sealing ring (704) is movably connected to the first sealing ring (603) and the first L-shaped sealing ring (604).

5. A double helical rotor pump sealing structure according to claim 3, characterized in that: The end surface of the pump housing (1) of the double helical rotor pump and the surface of the bearing end cover (2) are provided with mounting holes, the surfaces of the first sealing disk (601) and the second sealing disk (701) are provided with holes, and the first sealing disk (601) is fixed to the end surface of the pump housing (1) of the double helical rotor pump by means of bolts, and the second sealing disk (701) is fixed to the end surface of the bearing end cover (2) by means of bolts.

6. A double helical rotor pump sealing structure according to claim 5, characterized in that: The first sealing disk (601) fits with the end surface of the pump housing (1) of the double helical rotor pump, and the end surface of the first sealing disk (601) fits tightly with the expansion filler (51) on the surface of the pump housing (1) of the double helical rotor pump; the second sealing disk (701) fits with the end surface of the bearing end cover (2), and the end surface of the second sealing disk (701) fits tightly with the expansion filler (51) on the surface of the bearing end cover (2).

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