Stirring shaft air seal structure of low-temperature stirring equipment

Abstract

The utility model provides a low-temperature stirring equipment stirring shaft air seal structure which comprises a vertically-arranged stirring shaft, the stirring shaft is arranged in a bearing box in a penetrating mode, a bearing connected with the stirring shaft is installed in the bearing box, and a sealing ring is arranged between the bearing box and the outer wall of the stirring shaft. The stirring shaft is coaxially sleeved with a gas ring and located above the bearing box, the gas ring is of a circular ring structure, a gap is formed between the inner wall of the gas ring and the outer wall of the stirring shaft, an annular cavity is formed in the gas ring, an air inlet pipe communicated with the annular cavity is arranged on the outer wall of the gas ring, the air inlet pipe is connected with an air pump, and air outlet holes are formed in the inner wall of the gas ring; the air blower blows air to the outer wall of the stirring shaft. A local airflow field can be formed on the outer wall of the stirring shaft, condensate water is prevented from being generated on the outer wall of the stirring shaft, and therefore the sealing effect of the low-temperature stirring equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical reaction devices, and particularly relates to a gas seal structure for a stirring shaft of a low-temperature stirring device. Background Art

[0002] In some chemical reactions, in order to make the substances participating in the reaction mix more quickly and evenly, a stirring shaft is usually arranged in the reaction tank to stir the reaction substances. And during some chemical reaction processes, a large amount of heat will be generated. In order to avoid the influence of too high temperature on the reaction effect and cause production accidents, some reaction tanks are provided with a hollow structure for the stirring shaft, and a low-temperature medium such as low-temperature oil or gas at about zero degree is introduced into the inside thereof. The heat generated by the reaction substances is taken away by the low-temperature medium through heat conduction, so as to achieve the purpose of cooling. Due to the introduction of the low-temperature medium inside the stirring shaft, it is easy to generate condensed water on the outer wall of the part of the stirring shaft exposed outside the reaction tank, and even frosting occurs, which is likely to have an adverse effect on the mechanical seal, such as reducing the elasticity of the seal, resulting in a decline in the sealing effect, and shortening the service life of the seal. Therefore, it is necessary to provide a structure for preventing frosting and discharging condensed water at the position where the bearing assembly and the seal assembly are installed on the stirring shaft to ensure the normal operation of the equipment. Content of the Utility Model

[0003] To solve the deficiencies of the prior art, the utility model provides a gas seal structure for a stirring shaft of a low-temperature stirring device, which can form a local air flow field on the outer wall of the stirring shaft to avoid the generation of condensed water on the outer wall of the stirring shaft at this position, thereby improving the sealing effect of the low-temperature stirring device.

[0004] In order to achieve the purpose of the utility model, the following scheme is proposed:

[0005] A gas seal structure for a stirring shaft of a low-temperature stirring device, comprising a vertically arranged stirring shaft, the stirring shaft passes through a bearing box, the inside of the bearing box is used for installing a bearing connecting the stirring shaft, and a sealing ring is arranged between the outer wall of the bearing box and the stirring shaft.

[0006] A gas ring is coaxially sleeved on the stirring shaft and is located above the bearing box. The gas ring is of an annular structure, and there is a gap between the inner wall thereof and the outer wall of the stirring shaft. The gas ring has an annular chamber inside, an air inlet pipe communicating with the annular chamber is arranged on the outer wall of the gas ring, the air inlet pipe is connected with an air pump, and air outlet holes are arranged on the inner wall of the gas ring for blowing air to the outer wall of the stirring shaft.

[0007] The beneficial effects of the present utility model are as follows: An air pump is used to inject air into the annular chamber, and then the air is discharged from the air outlet holes and blown towards the stirring shaft, so that the outside of the stirring shaft is in a dry environment, thereby preventing the formation of condensed water and frost on the outer wall of the stirring shaft. It can effectively prevent the formation of condensed water at the installation position of the sealing ring and avoid frosting here, thus ensuring the sealing effect of the sealing ring and extending the service life of the sealing ring. Brief Description of the Drawings

[0008] The drawings described herein are only for illustrating the selected embodiments, not all possible implementation schemes, and are not intended to limit the scope of the present utility model.

[0009] Figure 1 It is a schematic diagram of the partial installation structure of the stirring shaft.

[0010] Figure 2 It is a partial cross-sectional view of the installation structure of the stirring shaft, bearing box, air ring and water baffle.

[0011] Figure 3 It is Figure 2 The partial enlarged view of part A in

[0012] Reference numerals in the drawings: Stirring shaft - 1, Bearing box - 2, Sealing ring - 21, Air ring - 3, Annular chamber - 31, Air inlet pipe - 32, Air outlet hole - 33, Water baffle - 4. Detailed Embodiments

[0013] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following describes the embodiments of the present utility model in detail with reference to the drawings. However, the embodiments described herein are only a part of the embodiments of the present utility model, not all of the embodiments.

[0014] As Figure 1 , Figure 2 shown, a gas seal structure for the stirring shaft of a low-temperature stirring device includes a vertically arranged stirring shaft 1. The stirring shaft 1 passes through a bearing box 2. The inside of the bearing box 2 is used to install and connect the bearing of the stirring shaft 1. A sealing ring 21 is provided between the outer wall of the bearing box 2 and the stirring shaft 1.

[0015] Specifically, as Figure 2 , Figure 3 shown, an air ring 3 is coaxially sleeved on the stirring shaft 1 and is located above the bearing box 2. The air ring 3 can be arranged on the bearing box 2 or can be separately connected to other parts of the reaction tank. The air ring 3 is a circular ring structure, and there is a gap between its inner wall and the outer wall of the stirring shaft 1. The air ring 3 has an annular chamber 31 inside. An air inlet pipe 32 communicating with the annular chamber 31 is provided on the outer wall of the air ring 3. The air inlet pipe 32 is connected to an air pump. Air outlet holes 33 are formed on the inner wall of the air ring 3 for blowing air towards the outer wall of the stirring shaft 1.

[0016] During use, an air pump is used to inject air into the annular chamber 31. Then the air is discharged from the air outlet hole 33 and blown towards the stirring shaft 1, so that the exterior of the stirring shaft 1 is in a dry environment, thereby preventing the formation of condensed water and frost on the outer wall of the stirring shaft 1. Since the air ring 3 is adjacent to the bearing housing 2, and the sealing ring 21 is usually arranged at the end position of the bearing housing 2, by arranging the air ring 3 above the bearing housing 2 to blow air on the outer wall of the stirring shaft 1, it can effectively prevent the formation of condensed water at the installation position of the sealing ring 21 and avoid frosting here, thus ensuring the sealing effect of the sealing ring 21 and extending the service life of the sealing ring.

[0017] Preferably, as Figure 2 、 Figure 3 shown, a water retaining disc 4 with a circular structure is provided on the outer wall of the stirring shaft 1. The outer diameter of the water retaining disc 4 is larger than the outer diameter of the air ring 3. The water retaining disc 4 is spaced above the air ring 3. The water retaining disc 4 rotates synchronously with the stirring shaft 1. The setting of the water retaining disc 4 can prevent the condensed water formed at the upper end of the stirring shaft 1 from dripping between the air ring 3 and the stirring shaft 1. The water retaining disc 4 rotates together with the stirring shaft 1, and the centrifugal force can be used to smoothly throw the liquid dripping on the water retaining disc 4 outwards in all directions. Specifically, the water retaining disc 4 can be connected to the stirring shaft 1 by welding, or a pair of locking nuts can be provided to lock the water retaining disc 4 on the stirring shaft 1. After the water retaining disc 4 is set, the air flow blown out from the air outlet hole 33 will be discharged outwards from the gap between the air ring 3 and the water retaining disc 4. When the air flow is discharged outwards from the gap, it can also effectively prevent the formation of condensed water at the bottom of the water retaining disc 4.

[0018] Preferably, as Figure 3 shown, the outer edge of the water retaining disc 4 has a downward flanging structure for preventing liquid from flowing back to the vicinity of the stirring shaft 1 when the equipment stops.

[0019] Further preferably, as Figure 3 shown, the end of the air outlet hole 33 facing the stirring shaft 1 is inclined towards the lower end of the stirring shaft 1, so that the air flow sweeps across the end of the bearing housing 2 and the sealing ring 21, in order to thoroughly take away the cold air and prevent the formation of condensed water.

[0020] Preferably, the air inlet pipe 32 is connected with a drying processor for improving the dryness of the air, so that the local environment between the air ring 3, the stirring shaft 1 and the bearing housing 2 is drier, and the formation conditions of condensed water are destroyed.

[0021] The above are only the preferred embodiments of the present utility model and do not represent that it is the only one or a limitation to the present utility model. Those skilled in the art should understand that without departing from the scope of the present utility model, various changes or equivalent replacements made to the present utility model all fall within the scope of protection of the present utility model.

Claims

1. A gas seal structure for the stirring shaft of a low-temperature stirring device, comprising a vertically arranged stirring shaft (1), the stirring shaft (1) passing through a bearing housing (2), the interior of the bearing housing (2) being used for installing a bearing connecting the stirring shaft (1), and a sealing ring (21) being provided between the outer wall of the bearing housing (2) and the stirring shaft (1), characterized in that, The stirring shaft (1) is coaxially sleeved with an air ring (3), and is located above the bearing box (2). The air ring (3) is of a circular ring structure, and there is a gap between its inner wall and the outer wall of the stirring shaft (1). The air ring (3) has an annular chamber (31) inside it. An air inlet pipe (32) communicating with the annular chamber (31) is provided on the outer wall of the air ring (3). The air inlet pipe (32) is connected to an air pump. Air outlet holes (33) are formed on the inner wall of the air ring (3) for blowing air towards the outer wall of the stirring shaft (1).

2. The gas seal structure of the stirring shaft of a low-temperature stirring device according to claim 1, characterized in that, A water retaining disc (4) with a circular structure is provided on the outer wall of the stirring shaft (1). The outer diameter of the water retaining disc (4) is larger than the outer diameter of the air ring (3). The water retaining disc (4) is spaced above the air ring (3) and rotates synchronously with the stirring shaft (1).

3. The gas seal structure of the stirring shaft of a low-temperature stirring device according to claim 2, characterized in that The outer edge of the water retaining disc (4) has a downward flanging structure.

4. A stirring shaft air seal structure of a low-temperature stirring device according to claim 1, characterized in that, One end of the air outlet hole (33) facing the stirring shaft (1) is inclined towards the lower end of the stirring shaft (1).

5. The gas seal structure of the stirring shaft of a low-temperature stirring device according to claim 1, characterized in that, The air inlet pipe (32) is connected with a drying processor for increasing the dryness of the air.

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