Ultralow-temperature butterfly valve with combination of lip seal and multi-layer seal

Abstract

The utility model relates to the technical field of ultralow-temperature butterfly valves, in particular to a lip-shaped seal and multi-layer seal combined ultralow-temperature butterfly valve which comprises a valve seat, a valve rod is rotatably connected onto the valve seat through a sealing bearing, a dish plate is fixedly connected onto the valve rod, a lip-shaped seal ring and a multi-layer seal ring are fixedly connected onto the dish plate, and the lip-shaped seal ring and the multi-layer seal ring are fixedly connected onto the valve seat. A valve seat ring is arranged in the valve seat, the valve seat ring abuts against the lip-shaped sealing ring and the multi-layer sealing ring, a fixing mechanism is arranged on the valve rod, a cavity is formed in the lip-shaped sealing ring, and a nitrogen injection mechanism is arranged in the cavity in a communicating mode. The service life of the valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of super low temperature butterfly valve especially relates to a kind of super low temperature butterfly valve of lip seal and multi-level sealing combination. BACKGROUND

[0002] Super low temperature butterfly valve is a kind of valve specially used for the regulation and control of super low temperature medium, when sealing, when sealing element is installed on disc plate, due to the opening and closing of valve, it will make sealing element contact with valve seat, long-term contact can cause sealing element to wear, cause gap, thus causing the sealing of valve to be damaged, thereby affecting the service life of valve. SUMMARY

[0003] The utility model discloses a kind of super low temperature butterfly valve of lip seal and multi-level sealing combination, to solve the defects of the sealing of valve in prior art is damaged, thereby affecting the service life of valve.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] Design a kind of super low temperature butterfly valve of lip seal and multi-level sealing combination, including valve seat, the valve seat is rotatably connected with valve stem by sealing bearing, the valve stem is fixedly connected with disc plate, the disc plate is fixedly connected with lip seal ring and multi-layer seal ring, the valve seat is provided with valve seat ring, the valve seat ring is in abutment with the lip seal ring, multi-layer seal ring, the valve stem is provided with fixed mechanism, the lip seal ring is provided with cavity, the cavity is provided with nitrogen injection mechanism.

[0006] Preferably, the fixed mechanism includes handle, the handle is fixedly connected on the valve stem, the valve seat is provided with a plurality of fixed holes at equal intervals, the handle is provided with fixed rod, the fixed rod is extended into the fixed hole, and the fixed rod is limited by limiting mechanism.

[0007] Preferably, the limiting mechanism includes connecting block, the connecting block is fixedly connected on the fixed rod, and the connecting block is fixedly connected with spring between the handle.

[0008] Preferably, the nitrogen injection mechanism includes conducting pipe, the valve stem is provided with placing hole, the placing hole is communicated with the cavity by the conducting pipe, the placing hole is in abutment with sealing plug, the sealing plug is fixedly connected with threaded rod, the threaded rod is screwedly connected with fixed block, and the fixed block is fixedly connected with the inner wall of the placing hole.

[0009] Preferably, the multi-layer sealing ring comprises a graphite layer and a metal layer, the graphite layer and the metal layer are fixedly connected, and the graphite layer is connected with the lip-shaped sealing ring.

[0010] The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve has the beneficial effects that when the lip-shaped sealing ring is worn, a gap is formed between the lip-shaped sealing ring and the valve seat ring, the nitrogen gas is injected and extruded into the cavity, the lip-shaped sealing ring is expanded, the lip-shaped sealing ring is re-arranged to abut against the valve seat ring, the sealing effect is ensured, the service life of the lip-shaped sealing ring is prolonged, and the service life of the valve is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve is shown in the structural schematic view of the utility model;

[0012] Figure 2 The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve is shown in the structural schematic view of the utility model;

[0013] Figure 3 The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve is shown in the structural schematic view of the utility model;

[0014] Figure 4 The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve is shown in the structural schematic view of the utility model; Figure 1 The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve is shown in the structural schematic view of the utility model;

[0015] Figure 5 The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve is shown in the structural schematic view of the utility model; Figure 3 The lip-shaped sealing and multi-layer sealing combined ultra-low temperature butterfly valve is shown in the structural schematic view of the utility model;

[0016] In the drawing: 1, valve seat; 2, handle; 3, valve rod; 4, valve seat ring; 5, disc plate; 6, spring; 7, connecting block; 8, fixed rod; 9, threaded rod; 10, fixed hole; 11, placing hole; 12, through pipe; 13, sealing plug; 14, lip-shaped sealing ring; 15, multi-layer sealing ring. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0018] Embodiment 1: refer to Figures 1-5The utility model provides a kind of ultra-low temperature butterfly valve of lip seal and multilayer seal combination, including valve seat 1, valve stem 3 is rotatably connected on valve seat 1 by sealing bearing, valve stem 3 is fixedly connected with disc plate 5, disc plate 5 is fixedly connected with lip seal ring 14 and multilayer seal ring 15, valve seat 1 is provided with valve seat ring 4, valve seat ring 4 is abutted with lip seal ring 14, multilayer seal ring 15, fixed mechanism is provided on valve stem 3, cavity is provided in lip seal ring 14, nitrogen injection mechanism is communicated and provided in cavity, when lip seal ring 14 is worn, so that lip seal ring 14 and valve seat ring 4 produce gap, affect the sealing property of valve, by nitrogen injection, nitrogen is extruded into cavity, lip seal ring 14 is expanded, so that lip seal ring 14 is abutted with valve seat ring 4 again, guarantee the effect of sealing, to extend the service life of lip seal ring 14, extend the service life of valve.

[0019] Fixed mechanism includes handle 2, handle 2 is fixedly connected on valve stem 3, a plurality of fixed holes 10 are peripherally and equally arranged on valve seat 1, fixed rod 8 is through and provided on handle 2, fixed rod 8 is inserted into fixed hole 10, fixed rod 8 is limited by limiting mechanism, limiting mechanism includes connecting block 7, connecting block 7 is fixedly connected on fixed rod 8, spring 6 is fixedly connected between connecting block 7 and handle 2, by rotating handle 2 to drive valve stem 3 to rotate, the state of valve is changed, by inserting fixed column 8 into fixed hole 10, handle 2 is fixed, so that valve stem 3 is fixed, and the state of disc plate 5 is fixed.

[0020] Embodiment 2: refer to Figures 1-5 As another preferred embodiment of the utility model, on the basis of embodiment 1, nitrogen injection mechanism includes conducting pipe 12, placing hole 11 is formed on valve stem 3, placing hole 11 is communicated with cavity by conducting pipe 12, sealing plug 13 is abutted in placing hole 11, screw rod 9 is fixedly connected on sealing plug 13, fixed block is threadedly connected on screw rod 9, fixed block is fixedly connected with the inner wall of placing hole 11, by rotating screw rod 9 to make sealing plug 13 move downward, so as to extrude nitrogen in placing hole 11 into cavity, so that lip seal ring 14 is expanded, and sealing is carried out.

[0021] When lip seal ring 14 is worn, so that lip seal ring 14 and valve seat ring 4 produce gap, by rotating screw rod 9, so that sealing plug 13 moves downward, nitrogen in placing hole 11 is extruded into cavity, so that lip seal ring 14 is expanded, and lip seal ring 14 is abutted with valve seat ring 4 again to seal.

[0022] Embodiment 3: The conventional ultra-low temperature butterfly valve disc seal adopts multi-level sealing, and the sealing between the multi-level sealing ring and the disc is achieved by the close adhesion of graphite and metal. This way is prone to cause damage to the graphite layer when the disc is closed, and the graphite layer is damaged and falls off after frequent opening and closing for several times, thereby affecting the sealing effect. Referring to Figure 5 As another preferred embodiment of the utility model, on the basis of embodiment 1, the multi-layer sealing ring 15 comprises a graphite layer and a metal layer, the graphite layer and the metal layer are fixedly connected, the graphite layer is connected with the lip-shaped sealing ring 14, the metal layer is attached to the sealing surface of the disc 5, so that the metal layer preferentially contacts the valve seat ring 4, thereby preventing the graphite layer from being damaged, and the sealing effect is ensured.

[0023] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. An ultra-low temperature butterfly valve combining lip seal and multi-layer seal, comprising a valve seat (1), a valve stem (3) is rotatably connected to the valve seat (1) through a sealing bearing, and a disc plate (5) is fixedly connected to the valve stem (3), characterized in that, The disc plate (5) is fixedly connected with a lip-shaped sealing ring (14) and a multi-layer sealing ring (15), the valve seat (1) is provided with a valve seat ring (4), the valve seat ring (4) abuts against the lip-shaped sealing ring (14) and the multi-layer sealing ring (15), the valve rod (3) is provided with a fixing mechanism, the lip-shaped sealing ring (14) is provided with a cavity, and the cavity is provided with a nitrogen injection mechanism in communication.

2. The ultra-low temperature butterfly valve of claim 1, wherein, The fixing mechanism comprises a handle (2) fixedly connected to the valve rod (3), a plurality of fixing holes (10) are circumferentially and equidistantly arranged on the valve seat (1), a fixing rod (8) is provided on the handle (2) in penetration, the fixing rod (8) is elongated into the fixing hole (10), and the fixing rod (8) is limited by a limiting mechanism.

3. The ultra-low temperature butterfly valve of claim 2, wherein, The limiting mechanism comprises a connecting block (7) fixedly connected to the fixing rod (8), and a spring (6) fixedly connected between the connecting block (7) and the handle (2).

4. The ultra-low temperature butterfly valve of claim 1, wherein, The nitrogen injection mechanism comprises a through pipe (12), a placing hole (11) is formed in the valve rod (3), the placing hole (11) is in communication with the cavity through the through pipe (12), a sealing plug (13) abuts against the placing hole (11), a threaded rod (9) is fixedly connected to the sealing plug (13), a fixing block is threadedly connected to the threaded rod (9) in penetration, and the fixing block is fixedly connected to the inner wall of the placing hole (11).

5. The ultra-low temperature butterfly valve of claim 1, wherein, The multi-layer sealing ring (15) comprises a graphite layer and a metal layer, the graphite layer is fixedly connected to the metal layer, and the graphite layer is connected to the lip-shaped sealing ring (14).

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