Shaft seal structure of high-temperature and high-pressure spiral conveyor

Abstract

The utility model discloses a shaft seal structure of a high-temperature high-pressure screw conveyer, which comprises a screw conveying main shaft (1), a labyrinth seal (2), a Parker ring (3) and a mechanical seal (4), the labyrinth seal (2), the Parker ring (3) and the mechanical seal (4) are arranged on the screw conveying main shaft (1), and the Parker ring (3) is arranged between the labyrinth seal (2) and the mechanical seal (4). Sealing protective gas is filled between the Parker ring (3) and the labyrinth seal (2) and between the Parker ring (3) and the mechanical seal (4). The labyrinth seal, the Parker ring and the mechanical seal are adopted at one end of the spiral conveying main shaft, and through combined use of the three seals, a sealing system can work well in the process that the spiral conveying main shaft conveys a high-pressure medium with particles, solid particles can be prevented from penetrating through the sealing device, and the service life of the sealing device is prolonged. And the gas can be prevented from leaking to the environment to injure the human body.

Description

Technical Field

[0001] This utility model relates to the field of screw conveyor technology, specifically to a shaft seal structure for a high-temperature and high-pressure screw conveyor. Background Technology

[0002] Screw conveyors transport materials using the axial force generated by the high-speed rotation of helical blades. They offer advantages such as simple structure, low manufacturing cost, strong sealing, and safe and convenient operation. Multiple loading and unloading points are possible, and they are suitable for horizontal or inclined conveying of powdery, granular, and small lump materials. Currently, screw conveyors are widely used in the cement and powdery material industries, as well as in chemical, building materials, metallurgical, and grain sectors. Their stable conveying, simple maintenance, and low failure rate make them highly favored by users.

[0003] When using screw conveyors to transport pressurized powder particles, solid particles tend to accumulate at the shaft seal. Screw conveyors often use packing seals, which achieve sealing by pressing single or multiple layers of packing in the stuffing box. However, packing seals cannot handle solid particles, which can easily damage the shaft seal, thus increasing inspection and maintenance costs. Utility Model Content

[0004] To solve at least one technical problem of the prior art, this utility model provides a shaft seal structure for a high-temperature and high-pressure screw conveyor.

[0005] To achieve the above-mentioned utility model objectives, the technical solution adopted by this utility model is: a shaft seal structure for a high-temperature and high-pressure screw conveyor, comprising a screw conveyor main shaft and a labyrinth seal, a Parker ring, and a mechanical seal disposed on the screw conveyor main shaft, wherein the Parker ring is disposed between the labyrinth seal and the mechanical seal, and a sealing protective gas is filled between the Parker ring and the labyrinth seal and between the Parker ring and the mechanical seal.

[0006] Furthermore, the labyrinth seal is fitted inside the screw conveyor main shaft on the side closest to the material. The labyrinth seal has a tortuous channel at the part that contacts the screw conveyor main shaft. The tortuous channel leads from the end of the labyrinth seal that is close to the material to the end of the labyrinth seal that is close to the Parker ring.

[0007] Furthermore, the tortuous channel contains a protective gas, the pressure of which is lower than the pressure of the sealing protective gas.

[0008] Furthermore, the mechanical seal is fitted onto the side of the screw conveyor main shaft 1 closest to the atmosphere, and the mechanical seal is a double-end mechanical seal.

[0009] Furthermore, the mechanical seal has a flushing system.

[0010] Furthermore, the mechanical seal includes a rotating ring, a stationary ring, an auxiliary sealing element, and an elastic compensation mechanism. The rotating ring is sleeved on the screw conveyor main shaft and rotates synchronously with the screw conveyor main shaft. The stationary ring is detachably connected to the stationary ring seat or flange.

[0011] Furthermore, the medium between the two end faces of the mechanical seal is liquid water or organic liquid.

[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0013] This invention employs a combination of labyrinth seal, Parker ring, and mechanical seal at one end of the screw conveyor spindle. By combining these three seals, the sealing system can be ensured to function properly during the conveying of high-pressure media containing particles. This prevents solid particles from passing through the sealing device and prevents gas from leaking into the environment and causing harm to personnel. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the shaft seal structure of a high-temperature screw conveyor according to the present invention. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0016] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0017] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0018] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0019] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] Reference Figure 1 This utility model provides a shaft seal structure for a high-temperature and high-pressure screw conveyor, including a screw conveyor main shaft 1 and a labyrinth seal 2, a Parker ring 3 and a mechanical seal 4 disposed on the screw conveyor main shaft 1. The Parker ring 3 is disposed between the labyrinth seal 2 and the mechanical seal 4, and the space between the Parker ring 3 and the labyrinth seal 2 and between the Parker ring 3 and the mechanical seal 4 is filled with a sealing and protective gas.

[0022] This invention employs three seals—a labyrinth seal 2, a Parker ring 3, and a mechanical seal 4—at one end of the screw conveyor main shaft 1 to ensure a tight seal. Sealing gas is filled between the Parker ring 3 and the labyrinth seal 2, and between the Parker ring 3 and the mechanical seal 4, further guaranteeing the sealing effect. During the conveying of pressurized powder particles, the solid particles are blocked by the labyrinth seal 2 and the Parker ring 3, and then blown back into the screw conveyor by the sealing gas. The labyrinth seal 2 and the Parker ring 3 completely block the solid particles, leaving only a small amount of gas to pass through to the mechanical seal 4. This gas is then blocked by the mechanical seal 4, preventing both solid particles and gas from leaking into the atmosphere. The combined use of these three seals ensures that the sealing system functions effectively during the conveying of high-pressure, particle-laden media, preventing solid particles from passing through the sealing device and preventing gas leakage into the environment and potential harm to personnel.

[0023] Furthermore, the labyrinth seal 2 is sleeved inside the spiral conveyor main shaft 1 on the side close to the material. The labyrinth seal 2 has a tortuous channel at the part that contacts the spiral conveyor main shaft 1. The tortuous channel leads from the end of the labyrinth seal 2 close to the material to the end of the labyrinth seal 2 close to the Parker ring 3.

[0024] Furthermore, the tortuous channel contains a protective gas, the pressure of which is lower than the pressure of the sealing protective gas.

[0025] Because the labyrinth seal 2 has a tortuous channel, solid particles and gas in the medium are blocked when passing through the tortuous channel. Even if some particles enter the channel of the labyrinth seal, the protective gas in the labyrinth seal can blow most of the particles into the screw conveyor.

[0026] Furthermore, both the protective gas and the sealing gas are inert gases.

[0027] Furthermore, the Parker ring 3 is a Parker ring with a protective gas. Even if the labyrinth seal 2 fails and a small amount of solid particles and gaseous medium pass through the labyrinth seal 2, the Parker ring 3, which is similar to a lip seal, tightly holds the screw conveyor shaft 1, preventing the solid particles from passing through. In addition, the back pressure side of the Parker ring 3 has a sealing protective gas with a higher pressure level than the protective gas inside the labyrinth seal 2, which can prevent the leakage of solid particles.

[0028] Furthermore, the mechanical seal 4 is sleeved on the side of the screw conveyor main shaft 1 closest to the atmosphere, and the mechanical seal 4 is a double-end mechanical seal 4.

[0029] Furthermore, the mechanical seal 4 has a flushing system.

[0030] Furthermore, the mechanical seal 4 includes a rotating ring, a stationary ring, an auxiliary sealing element, and an elastic compensation mechanism. The rotating ring is sleeved on the screw conveyor main shaft 1 and rotates synchronously with the screw conveyor main shaft 1. The stationary ring is detachably connected to the stationary ring seat or flange.

[0031] Furthermore, the medium between the two end faces of the mechanical seal 4 is liquid water or organic liquid.

[0032] Since mechanical seal 4 is a double-end mechanical seal, the medium between the two ends is liquid water or organic liquid. When working, these liquids carry away the heat generated by the friction of the sealing surfaces. The working pressure of the sealing liquid is slightly higher than the pressure of the sealing protective gas of Parker ring 3. This ensures that the gas medium in the screw conveyor cannot leak into the atmosphere, thus ensuring good sealing function.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shaft seal structure for a high-temperature, high-pressure screw conveyor, characterized in that, The device comprises a screw conveying spindle (1), a labyrinth seal (2), a Parker ring (3) and a mechanical seal (4) arranged on the screw conveying spindle (1), the Parker ring (3) is arranged between the labyrinth seal (2) and the mechanical seal (4), and the Parker ring (3) and the labyrinth seal (2) and the Parker ring (3) and the mechanical seal (4) are filled with sealing protection gas.

2. The high temperature and high pressure screw conveyor shaft seal structure according to claim 1, wherein, The labyrinth seal (2) is arranged on the inside of the screw conveying spindle (1) near the material, the labyrinth seal (2) is provided with a tortuous channel at the part in contact with the screw conveying spindle (1), and the tortuous channel leads from one end of the labyrinth seal (2) near the material to the end of the labyrinth seal (2) close to the Parker ring (3).

3. The high temperature high pressure screw conveyor shaft seal structure as claimed in claim 2, wherein, The tortuous channel is filled with protection gas, and the gas pressure of the protection gas is less than that of the sealing protection gas.

4. The high temperature and high pressure screw conveyor shaft seal structure according to claim 1, wherein The mechanical seal (4) is arranged on the side of the screw conveying spindle (1) close to the atmosphere, and the mechanical seal (4) is a double-end mechanical seal (4).

5. The high temperature high pressure screw conveyor shaft seal structure as claimed in claim 4, wherein, The mechanical seal (4) has a flushing system.

6. The high temperature high pressure screw conveyor shaft seal structure according to claim 4 or 5, wherein The mechanical seal (4) comprises a dynamic ring, a static ring, an auxiliary sealing element and an elastic compensation mechanism, the dynamic ring is arranged on the screw conveying spindle (1) and rotates synchronously with the screw conveying spindle (1), and the static ring is detachably connected with a static ring seat or a flange.

7. The high temperature and high pressure screw conveyor shaft seal structure according to claim 4, wherein The medium between the double-end faces of the mechanical seal (4) is liquid water or organic liquid.

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