Single screw pump shaft seal structure

Abstract

The utility model discloses a single screw pump shaft seal structure, including single screw pump shell and first sealing assembly, single screw pump shell: the inside upper end is installed with bearing, the inside installation of bearing has the pump shaft, the upper end of single screw pump shell is installed with lubricating assembly, lubricating assembly is located the top of bearing, the lower extreme of pump shaft surface installs second sealing assembly, first sealing assembly: contain sealing dynamic ring, sealing static ring and connecting bolt, the circumference of pump shaft is fixed with sealing dynamic ring, the inside of single screw pump shell is fixed with sealing static ring through evenly distributed connecting bolt, sealing static ring is sleeved on the surface of sealing dynamic ring, second sealing assembly contains connecting bucket, extruding ring, spring and conical ring, the circumference of pump shaft is fixed with connecting bucket, can avoid granular impurity infiltration component gap.

Description

Technical Field

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

[0002] In existing technologies, screw pumps are widely used as feeding devices in industries such as manufacturing, construction, agriculture, animal husbandry, and medicine. The single screw pump is a relatively simple and widely used positive displacement pump, possessing advantages such as stable flow rate, low pressure pulsation, low noise, high efficiency, long service life, and reliable operation. Furthermore, it does not agitate the medium during transport and is insensitive to the viscosity of the medium, making it particularly suitable for transporting high-viscosity media.

[0003] In current single-screw pump structures, a shaft seal is required between the drive shaft and the suction chamber. Single-screw pumps typically use two types of shaft seals: packing seals and mechanical seals. Compared to packing seals, which suffer from low reliability and high maintenance costs, mechanical seals are easier to inspect and maintain, and are more widely used. However, different manufacturers use different sealing structures, but they generally have a large number of structural components. Furthermore, due to the structural characteristics of single-screw pumps, when transporting mixtures, the high conveying pressure can cause particulate impurities to seep into the gaps between components when entering the shaft seal area. This can cause wear and breakage of components in the mechanical seal, leading to pump shaft seal failure, media leakage, and ultimately, the pump malfunctioning. Therefore, we propose a new shaft seal structure for single-screw pumps. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a single screw pump shaft seal structure that can prevent particulate impurities from penetrating into the gaps between components, thus effectively solving the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a single screw pump shaft seal structure, comprising a single screw pump housing and a first sealing assembly;

[0006] Single screw pump housing: A bearing is installed at the upper end of the interior, and a pump shaft is installed inside the bearing. A lubrication assembly is installed at the upper end of the single screw pump housing, and the lubrication assembly is located above the bearing. A second sealing assembly is installed at the lower end of the surface of the pump shaft.

[0007] The first sealing assembly includes a sealing rotating ring, a sealing stationary ring, and connecting bolts. The sealing rotating ring is fixed on the circumferential surface of the pump shaft. The sealing stationary ring is fixed inside the single screw pump housing by evenly distributed connecting bolts. The sealing stationary ring is sleeved on the surface of the sealing rotating ring. By setting the first sealing assembly, leakage of the medium inside the single screw pump housing through the gap between the pump shaft and the single screw pump housing is prevented.

[0008] Furthermore, the second sealing assembly includes a connecting barrel, a compression ring, a spring, and a conical ring. The connecting barrel is fixed on the circumferential surface of the pump shaft, and a spring is fixed inside the connecting barrel. The spring is sleeved on the surface of the pump shaft, and a compression ring is fixed to the upper end of the spring. An annular groove is formed at the lower end of the sealing stationary ring, and a conical ring is fixed inside the annular groove. The compression ring and the surface of the conical ring are in contact. The second sealing assembly protects the sealing moving ring and the sealing stationary ring.

[0009] Furthermore, the lubrication assembly includes a storage ring, a sponge ring, and a liquid outlet. The upper end of the single screw pump housing is provided with an opening, and a storage ring is provided inside the opening. The storage ring is sleeved on the surface of the pump shaft. A storage groove is opened at the upper end of the storage ring, and a sponge ring is filled inside the storage groove. A uniformly distributed liquid outlet is opened at the lower end of the storage ring. By setting up the lubrication assembly, it is convenient to lubricate the bearing.

[0010] Furthermore, it also includes a fixing component, which includes a fixing ring and fixing bolts. The upper end of the circumferential surface of the storage ring is fixed with a fixing ring, and the fixing ring is fixed to the upper side of the single screw pump housing by evenly distributed fixing bolts. The storage ring is fixed by setting the fixing component.

[0011] Furthermore, the upper end of the opening at the upper end of the storage ring is provided with evenly distributed threaded grooves, and an external threaded ring is threadedly connected to the opening at the upper end of the storage ring. The annular groove at the upper end of the storage ring is sealed by the external threaded ring.

[0012] This invention, by setting a first sealing component, enables the sealing dynamic ring and sealing stationary ring fixed on the pump shaft to cooperate in initial sealing during use, thereby preventing media leakage inside the single screw pump casing. At the same time, the connecting barrel will block the media during use, and the compression ring inside the connecting barrel will be tightly fitted with the conical ring under the action of the spring. Under these circumstances, the media can be prevented from entering between the sealing dynamic ring and the sealing stationary ring, causing wear and leakage between the sealing dynamic ring and the sealing stationary ring. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0014] Figure 2 This is a front sectional view of the present invention;

[0015] Figure 3 This is an enlarged view of section A of this utility model.

[0016] In the diagram: 1 Single screw pump housing, 2 External threaded ring, 3 Pump shaft, 4 Bearing, 5 First sealing assembly, 51 Sealing rotating ring, 52 Sealing stationary ring, 53 Connecting bolt, 6 Second sealing assembly, 61 Connecting barrel, 62 Compression ring, 63 Spring, 64 Conical ring, 7 Lubrication assembly, 71 Storage ring, 72 Sponge ring, 73 Liquid outlet, 8 Fixing assembly, 81 Fixing ring, 82 Fixing bolt. Detailed Implementation

[0017] Please see Figure 1-3 This embodiment provides a technical solution: a single screw pump shaft seal structure, including a single screw pump housing 1 and a first sealing assembly 5;

[0018] The single screw pump housing 1 has a bearing 4 installed at its upper end, and a pump shaft 3 is installed inside the bearing 4. A lubrication assembly 7 is installed at the upper end of the housing 1, located above the bearing 4. A second sealing assembly 6 is installed at the lower end of the pump shaft 3. The second sealing assembly 6 includes a connecting barrel 61, a compression ring 62, a spring 63, and a conical ring 64. The connecting barrel 61 is fixed to the circumferential surface of the pump shaft 3, and a spring 63 is fixed inside the connecting barrel 61. The spring 63 is sleeved on the surface of the pump shaft 3, and a compression ring 62 is fixed to the upper end of the spring 63. An annular groove is formed at the lower end of the sealing stationary ring 52, and a conical ring 64 is fixed inside the annular groove. The surfaces of the compression ring 62 and the conical ring 64 are in contact. The lubrication assembly 7 includes a storage ring 71, a sponge ring 72, and a liquid outlet. The single screw pump housing 1 has an opening at its upper end, and a storage ring 71 is provided inside the opening. The storage ring 71 is sleeved on the surface of the pump shaft 3. A storage groove is provided at the upper end of the storage ring 71, and a sponge ring 72 is filled inside the storage groove. The lower end of the storage ring 71 has evenly distributed liquid outlets 73. The housing also includes a fixing component 8, which includes a fixing ring 81 and fixing bolts 82. The fixing ring 81 is fixed at the upper end of the circumferential surface of the storage ring 71. The fixing ring 81 is fixed to the upper side of the single screw pump housing 1 by evenly distributed fixing bolts 82. The storage ring 71 is fixed by the fixing component 8. The bearing 4 is lubricated by the lubrication component 7. The sealing dynamic ring 51 and the sealing stationary ring 52 are protected by the second sealing component 6.

[0019] The first sealing assembly 5 includes a sealing dynamic ring 51, a sealing stationary ring 52, and connecting bolts 53. The sealing dynamic ring 51 is fixed on the circumferential surface of the pump shaft 3. The sealing stationary ring 52 is fixed inside the single screw pump housing 1 by evenly distributed connecting bolts 53. The sealing stationary ring 52 is sleeved on the surface of the sealing dynamic ring 51. By setting the first sealing assembly 5, leakage of the medium inside the single screw pump housing 1 through the gap between the pump shaft 3 and the single screw pump housing 1 is prevented.

[0020] Wherein: the upper end of the opening at the upper end of the storage ring 71 is provided with evenly distributed threaded grooves, and the opening at the upper end of the storage ring 71 is threadedly connected to an external threaded ring 2, and the annular groove at the upper end of the storage ring 71 is sealed by setting the external threaded ring 2.

[0021] During use, the sealing ring 51 and sealing ring 52, which are fixed on the pump shaft 3, cooperate to perform a preliminary seal, which can prevent the medium from leaking inside the single screw pump casing. At the same time, the connecting barrel 61 will block the medium during use, and the compression ring 62 inside the connecting barrel 61 will be tightly fitted to the conical ring 64 under the action of the spring 63. In this way, the medium can be prevented from entering between the sealing ring 51 and sealing ring 52, causing wear and leakage between the sealing ring 51 and sealing ring 52. During use, the external threaded ring 2 can be removed and lubricating oil can be injected into the annular groove opened at the upper end of the storage ring 71. The lubricating oil entering the annular groove will be absorbed by the sponge ring 72. After absorption, part of the lubricating oil will enter the bearing 4 through the evenly distributed outlet 73 to lubricate it, ensuring the stability of the pump shaft 3 rotation.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A single screw pump shaft seal structure, characterized in that: Includes a single screw pump housing (1) and a first sealing assembly (5); Single screw pump housing (1): A bearing (4) is installed at the upper end of the interior, and a pump shaft (3) is installed inside the bearing (4). A lubrication assembly (7) is installed at the upper end of the single screw pump housing (1), and the lubrication assembly (7) is located above the bearing (4). A second sealing assembly (6) is installed at the lower end of the surface of the pump shaft (3). First sealing assembly (5): includes a sealing moving ring (51), a sealing stationary ring (52) and connecting bolts (53). The sealing moving ring (51) is fixed on the circumferential surface of the pump shaft (3). The sealing stationary ring (52) is fixed inside the housing (1) of the single screw pump by evenly distributed connecting bolts (53). The sealing stationary ring (52) is sleeved on the surface of the sealing moving ring (51).

2. The single screw pump shaft seal structure according to claim 1, characterized in that: The second sealing assembly (6) includes a connecting barrel (61), a compression ring (62), a spring (63), and a conical ring (64). The connecting barrel (61) is fixed on the circumferential surface of the pump shaft (3). The spring (63) is fixed inside the connecting barrel (61). The spring (63) is sleeved on the surface of the pump shaft (3). The compression ring (62) is fixed at the upper end of the spring (63). An annular groove is opened at the lower end of the sealing stationary ring (52). The conical ring (64) is fixed inside the annular groove. The surface of the compression ring (62) is in contact with the surface of the conical ring (64).

3. The single screw pump shaft seal structure according to claim 1, characterized in that: The lubrication assembly (7) includes a storage ring (71), a sponge ring (72), and a liquid outlet (73). The upper end of the single screw pump housing (1) is provided with an opening, and the storage ring (71) is provided inside the opening. The storage ring (71) is sleeved on the surface of the pump shaft (3). The upper end of the storage ring (71) is provided with a storage groove, and the inside of the storage groove is filled with a sponge ring (72). The lower end of the storage ring (71) is provided with evenly distributed liquid outlets (73).

4. The single screw pump shaft seal structure according to claim 3, characterized in that: It also includes a fixing component (8), which includes a fixing ring (81) and fixing bolts (82). The upper end of the circumferential surface of the storage ring (71) is fixed with the fixing ring (81), and the fixing ring (81) is fixed to the upper side of the single screw pump housing (1) by evenly distributed fixing bolts (82).

5. The single-screw pump shaft seal structure according to claim 3, characterized in that: The upper end of the opening at the upper end of the storage ring (71) is provided with evenly distributed threaded grooves, and the opening at the upper end of the storage ring (71) is threadedly connected to an external threaded ring (2).

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