Flushable double-end-face mechanical sealing device

Abstract

The utility model provides a flushable double-end-face mechanical sealing device which comprises a pump shaft and a pump cavity, a rotor is installed at the front end of the pump shaft, and a main mechanical sealing moving ring is installed at the rotor end. A double-end-face mechanical sealing seat is installed at one end of a pump cavity, a check ring and a push ring are installed at one end of the mechanical sealing seat, a winding type wave spring is installed between the push ring and the mechanical sealing seat, and a main mechanical sealing static ring is installed in the pump cavity and matched with a main mechanical sealing moving ring to form a sealing face. The other end of the double-end-face mechanical sealing seat is provided with an auxiliary mechanical sealing static ring which is fixed in the mechanical sealing seat through a cylindrical pin, an auxiliary mechanical sealing static ring is embedded in the static ring, an auxiliary mechanical sealing moving ring is installed on a pump shaft, and a sealing face is formed by the auxiliary mechanical sealing moving ring and the auxiliary mechanical sealing static ring. When special materials are conveyed, a cooling liquid pipeline can be connected to effectively lubricate and cool the sealing device, a small amount of materials left on the sealing end face are washed, and sealing stability and sanitation and safety in the conveying process in the pump are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal structures, specifically a flushable double-end mechanical seal device. Background Technology

[0002] Rotary pumps are widely used in industries such as food, beverages, condiments, coatings, daily chemicals, fine chemicals, and pharmaceuticals. These industries place high demands on mechanical seals, requiring thorough cleaning to prevent unsanitary conditions. Because rotary pumps primarily handle viscous materials, the operating conditions for mechanical seals are extremely harsh. Most mechanical seals currently rely on the axial force generated by a large spring to ensure a tight fit between the dynamic and static rings, preventing material leakage. However, under complex operating conditions, the pressure within the pump chamber fluctuates constantly, and the sealing face wears down. Traditional large springs cannot compensate in time and fail, leading to material leakage. When conveying easily crystallizing materials, crystals easily deposit on the sealing face, causing seal failure. When conveying high-temperature materials, the sealing face often burns due to excessive heat. Furthermore, due to the complexity of the rotary pump structure, the mechanical seal needs to be simple in design and easy to disassemble and replace, rather than requiring the rotary pump to be disassembled piecemeal before replacing the mechanical seal, which only increases trouble and causes unnecessary losses. Utility Model Content

[0003] To address the problems of existing technologies, this invention provides a flushable double-end mechanical seal device. When conveying special materials, a coolant pipe can be connected to effectively lubricate and cool the sealing device, flushing away any remaining material on the sealing end face, thus ensuring the stability of the seal and the hygiene and safety of the pump conveying process.

[0004] This utility model includes a pump shaft and a pump chamber. A rotor is mounted on the front end of the pump shaft and fixed to the pump shaft with a rotor nut. A main mechanical seal rotating ring is mounted on one end of the rotor. A double-end mechanical seal seat is mounted on one end of the pump chamber and fixed with screws. A retaining ring and a push ring are mounted on one end of the mechanical seal seat. A wound wave spring is installed between the push ring and the mechanical seal seat. The main mechanical seal stationary ring is installed in the pump chamber and cooperates with the main mechanical seal rotating ring to form a sealing surface. A secondary mechanical seal stationary ring is mounted on the other end of the double-end mechanical seal seat. The secondary mechanical seal stationary ring is embedded in the stationary ring. The secondary mechanical seal rotating ring is mounted on the pump shaft and forms a sealing surface with the secondary mechanical seal stationary ring.

[0005] In a further improvement, one end of the rotor has a circular hole with a cylindrical pin installed, which matches the notch on the main mechanical seal rotating ring. When the pump shaft rotates, it drives the rotor and the main mechanical seal rotating ring to rotate.

[0006] In a further improvement, the push ring has a stamped boss that matches the notch on the main mechanical seal stationary ring, thereby fixing the main mechanical seal stationary ring inside the pump cavity.

[0007] In a further improvement, the pump shaft has a notch that mates with the inner ring of the auxiliary mechanical seal's moving ring. When the pump shaft rotates, it drives the auxiliary mechanical seal's moving ring to rotate.

[0008] Further improvements include a first O-ring between the rotor and the main mechanical seal rotating ring, a second O-ring between the pump chamber and the main mechanical seal stationary ring, a third O-ring between the pump chamber and the double-end face mechanical seal seat, a fourth O-ring between the rotor and the rotor nut, a fifth O-ring between the rotor and the pump shaft, a sixth O-ring between the auxiliary mechanical seal stationary ring and the double-end face mechanical seal seat, and a seventh O-ring between the auxiliary mechanical seal rotating ring and the pump shaft, to prevent leakage of materials and coolant.

[0009] In a further improvement, a disc spring is provided between the rotor nut and the rotor to press the rotor; the disc spring is fixed to the rotor nut with an eighth O-ring for easy assembly.

[0010] 1. Utilizing the advantage of uniform force distribution of the spiral wave spring, the sealing end face is timely and adequately compensated when the rotor moves axially.

[0011] 2. The main mechanical seal is built-in; replacement can be performed simply by opening the pump cover and removing the rotor. The auxiliary mechanical seal is external, allowing for direct visualization of coolant leaks.

[0012] 3. Throughout the entire conveying process, the conveyed medium only comes into contact with the moving and stationary rings and the O-ring, ensuring hygiene and safety during the conveying process within the pump.

[0013] 4. When conveying special materials, the coolant can enter the mechanical seal through the double-end mechanical seal seat to cool and flush the end faces of the main mechanical seal and the auxiliary mechanical seal, without contacting the material and causing leakage.

[0014] 5. Install an O-ring on the rotor nut to fix the disc spring to the rotor nut for easy assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the rotor structure.

[0017] Figure 3 This is a schematic diagram of the main mechanical seal's rotating ring structure.

[0018] Figure 4This is a schematic diagram of the stationary ring structure of the main mechanical seal.

[0019] Figure 5 This is a schematic diagram of the push ring structure.

[0020] Figure 6 This is a schematic diagram of the dynamic ring structure of the auxiliary mechanical seal.

[0021] Figure 7 This is a schematic diagram of the pump shaft structure. Detailed Implementation

[0022] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] The structure of this utility model is as follows: Figure 1 As shown, the pump includes a pump shaft 24 and a pump chamber 6. A rotor 5 is mounted on the front end of the pump shaft 24 and is fixed to the pump shaft 24 with a rotor nut 1. One end of the rotor 5 is equipped with a main mechanical seal rotating ring 9. One end of the pump chamber 6 is equipped with a double-end mechanical seal seat 18 and is fixed with screws. One end of the mechanical seal seat 18 is equipped with a retaining ring 13 and a push ring 14. A spiral wave spring 15 is installed between the push ring 14 and the mechanical seal seat 18. The main mechanical seal stationary ring 10 is installed in the pump chamber 6 and cooperates with the main mechanical seal rotating ring 9 to form a sealing surface. The other end of the double-end mechanical seal seat 18 is equipped with a secondary mechanical seal stationary ring 20. A secondary mechanical seal stationary ring 21 is embedded in the stationary ring 20. The secondary mechanical seal rotating ring 22 is mounted on the pump shaft 24 and forms a sealing surface with the secondary mechanical seal stationary ring 21.

[0024] 2. For example Figure 2 and Figure 3 As shown, one end of the rotor 5 has a circular hole with a cylindrical pin 7 installed, which matches the notch on the main mechanical seal ring 9. When the pump shaft 24 rotates, it drives the rotor 5 and the main mechanical seal ring 9 to rotate.

[0025] 3. For example Figure 4 and Figure 5 As shown, the push ring 14 has a stamped boss that matches the notch on the main mechanical seal stationary ring 10, thereby fixing the main mechanical seal stationary ring 10 in the pump chamber 6.

[0026] 4. For example Figure 6 and Figure 7 As shown, the pump shaft 24 has a notch that mates with the inner ring of the auxiliary mechanical seal dynamic ring 22. When the pump shaft 24 rotates, it drives the auxiliary mechanical seal dynamic ring 22 to rotate.

[0027] The rotor 5 has a first O-ring 8 between it and the main mechanical seal moving ring 9; the pump chamber 6 has a second O-ring 11 between it and the main mechanical seal stationary ring 10; the pump chamber 6 has a third O-ring 12 between it and the double-end face mechanical seal seat 18; the rotor 5 has a fourth O-ring 4 between it and the rotor nut 1; the rotor 5 has a fifth O-ring 19 between it and the pump shaft 24; the auxiliary mechanical seal stationary ring 20 has a sixth O-ring 16 between it and the double-end face mechanical seal seat 18; and the auxiliary mechanical seal moving ring 22 has a seventh O-ring 23 between it and the pump shaft 24.

[0028] A disc spring 2 is located between the rotor nut 1 and the rotor 5, which can press the rotor 5 tightly; the disc spring 2 is fixed to the rotor nut 1 by the eighth O-ring 3.

[0029] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of this utility model. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model, without departing from the principle of this utility model, should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A flushable double mechanical seal device, comprising a pump cavity (6) and a pump shaft (24), the front end of the pump shaft (24) is provided with a rotor (5), one end of the rotor (5) is provided with a main mechanical seal driving ring (9), characterized in that: The pump cavity (6) is provided with a double-end mechanical seal seat (18) at one end, the mechanical seal seat (18) is provided with a check ring (13) and a push ring (14) at one end, the push ring (14) is provided with a winding wave spring (15) between the mechanical seal seat (18), the main mechanical seal static ring (10) is installed in the pump cavity (6) and cooperates with the main mechanical seal dynamic ring (9) to form a sealing surface; the double-end mechanical seal seat (18) is provided with a secondary mechanical seal static ring (20) at the other end, the secondary mechanical seal static ring (21) is embedded in the static ring (20), and the secondary mechanical seal dynamic ring (22) is installed on the pump shaft (24) and cooperates with the secondary mechanical seal static ring (21) to form a sealing surface.

2. The flushable double face mechanical seal device of claim 1, wherein: The push ring (14) is provided with a boss formed by stamping and cooperating with a notch on the main mechanical seal static ring (10), so that the main mechanical seal static ring (10) is fixed in the pump cavity (6).

3. The flushable double mechanical seal apparatus of claim 1, wherein: The pump shaft (24) is provided with a notch matched with the inner ring of the secondary mechanical seal dynamic ring (22), so that the secondary mechanical seal dynamic ring (22) is driven to rotate when the pump shaft (24) rotates.

4. The flushable double mechanical seal apparatus of claim 1, wherein: The rotor (5) and the main mechanical seal dynamic ring (9) are provided with a first O-shaped ring (8), the pump cavity (6) and the main mechanical seal static ring (10) are provided with a second O-shaped ring (11), the pump cavity (6) and the double-end mechanical seal seat (18) are provided with a third O-shaped ring (12), the rotor (5) and the rotor nut (1) are provided with a fourth O-shaped ring (4), the rotor (5) and the pump shaft (24) are provided with a fifth O-shaped ring (19), the secondary mechanical seal static ring (20) and the double-end mechanical seal seat (18) are provided with a sixth O-shaped ring (16), and the secondary mechanical seal dynamic ring (22) and the pump shaft (24) are provided with a seventh O-shaped ring (23).

5. The flushable double mechanical seal apparatus of claim 1, wherein: The rotor (5) and the rotor nut (1) are provided with a disc spring (2), the disc spring (2) is pressed against the rotor (5), and an eighth O-shaped ring (3) is used for fixing the disc spring (2) on the rotor nut (1).

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