Vacuum-resistant concentric double-shaft stirring kettle without mechanical seal

Abstract

The utility model discloses a mechanical-seal-free vacuum-resistant concentric double-shaft stirring kettle which comprises a barrel, a high-speed shaft and a low-speed shaft of the barrel are coaxially arranged, the high-speed shaft is arranged in the low-speed shaft in a penetrating mode and extends downwards after penetrating out of the low-speed shaft, and the low-speed shaft is located in a low-speed bearing box; the low-speed bearing box and the cylinder body are detachably and fixedly connected and sealed; a high-speed shaft lower bearing seat, a high-speed shaft lower bearing and a high-speed shaft lower bearing cover are arranged at the lower end of the low-speed shaft, the high-speed shaft lower bearing seat is fixedly connected to the low-speed shaft, and a first O-shaped sealing ring and a first oil seal are arranged between the high-speed shaft lower bearing cover and the high-speed shaft. A second O-shaped sealing ring is arranged between the high-speed shaft lower bearing cover and the high-speed shaft lower bearing seat; the low-speed bearing box is provided with a low-speed shaft lower bearing and a low-speed shaft lower bearing cover at the penetrating-out end of the low-speed shaft, a second oil seal and a third O-shaped sealing ring are arranged between the low-speed shaft lower bearing cover and the low-speed shaft, and the low-speed shaft lower bearing cover and the low-speed bearing box are detachably and fixedly connected and sealed.

Description

Technical Field

[0001] The utility model belongs to the technical field of stirring kettles, in particular to a concentric double-shaft stirring kettle without mechanical seal and resistant to vacuum. Background Art

[0002] The concentric twin-shaft stirred tank uses two motors to provide power, with high-speed stirring and low-speed stirring being carried out coaxially. Driven by the high-speed shaft, the high-speed stirring dispersion disc runs at high speed and performs a strong shearing function. The low-speed shaft drives the stirring paddle to make circular motion along the axis, driving the entire material to make rotational motion along the axis. The stirring blade is equipped with a scraper arm device to achieve wall-sticking motion without dead angles on the inner wall of the cylinder; it is widely used in food, medical, cosmetics, adhesives and other occasions. The seal between the high-speed shaft and the low-speed shaft of the traditional concentric twin-shaft stirred tank often uses a mechanical seal, but the cost of mechanical seals is high, and the maintenance cost is also high. In addition, the requirements for mechanical seals used in vacuum working environments will also be greatly increased, which significantly increases the production and maintenance costs. Our company is considering whether a new sealing structure can be used to replace it. Summary of the Invention

[0003] The utility model aims to provide a mechanical seal-free vacuum-resistant concentric double-shaft stirring kettle, which is intended to reduce the maintenance and production costs of the stirring kettle.

[0004] In order to solve the above technical problems, the purpose of this utility model is achieved as follows:

[0005] A mechanical seal-free vacuum-resistant concentric double-shaft stirred kettle, comprising a cylinder, a high-speed shaft motor, a high-speed stirrer, a high-speed shaft, a low-speed shaft motor, a low-speed shaft and a low-speed stirrer; the high-speed shaft is coaxially arranged with the low-speed shaft, and the low-speed shaft is hollow, the high-speed shaft is passed through the low-speed shaft, and extends downward after passing through the low-speed shaft, and the low-speed shaft is located in the low-speed bearing box; the low-speed bearing box is detachably fixedly connected to the cylinder and sealed; the lower end of the low-speed shaft is provided with a high-speed shaft lower bearing seat, a high-speed shaft lower bearing and a high-speed shaft lower bearing Cover, the high-speed shaft lower bearing seat is fixedly connected to the low-speed shaft, a first O-ring and a first oil seal are provided between the high-speed shaft lower bearing cover and the high-speed shaft, a second O-ring is provided between the high-speed shaft lower bearing cover and the high-speed shaft lower bearing seat; the low-speed bearing box is provided with a low-speed shaft lower bearing and a low-speed shaft lower bearing cover at the outlet end of the low-speed shaft, a second oil seal and a third O-ring are provided between the low-speed shaft lower bearing cover and the low-speed shaft, and the low-speed shaft lower bearing cover and the low-speed shaft are detachably fixedly connected and sealed to the low-speed bearing box.

[0006] On the basis of the above solution and as a preferred solution of the above solution: the lower bearing seat of the high-speed shaft and the lower end of the low-speed shaft are fixedly connected by welding.

[0007] On the basis of the above solution and as a preferred solution of the above solution: the lower bearing seat of the high-speed shaft and the lower end of the low-speed shaft are fully welded.

[0008] On the basis of the above solution and as a preferred solution of the above solution: the first oil seal and the second oil seal are both stainless steel PTFE skeleton oil seals.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: a connecting flange is fixedly provided on the low-speed bearing box, a flange top cover is fixedly provided at the connecting end of the cylinder and the connecting flange, a threaded hole is opened on the flange top cover, and the bolt passes through the connecting flange and is screwed into the threaded hole, and a sealing ring is provided between the sealing surface of the connecting flange and the flange top cover.

[0010] On the basis of the above solution and as a preferred solution of the above solution: a hinged scraper is provided between the low-speed agitator and the inner wall of the barrel.

[0011] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: by arranging a first oil seal and a first O-ring seal between the high-speed shaft and the low-speed shaft, and cooperating with the bearing box and the bearing, the high-speed shaft and the low-speed shaft support can be simply and reliably sealed; at the same time, a second oil seal and a third O-ring seal are arranged between the low-speed shaft and the low-speed bearing box, and cooperating with the corresponding bearing box and the bearing, so that while the low-speed shaft rotates, a simple and reliable seal is achieved between the low-speed shaft and the low-speed bearing box; thus, compared with the complex structure and high cost of mechanical seals, the sealing structure of the present application is simple, reliable, and has low operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0014] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the given embodiments, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0015] In the description of this application, it should be understood that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0016] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0017] See Figure 1-2 As shown, the present application discloses a concentric double-shaft stirring kettle without mechanical seal and vacuum resistance, comprising a cylinder 12, an upper end of the cylinder being provided with an upper head 16 by full-circle welding, and a lower end being provided with a lower head 13 by full-circle welding, and further comprising a high-speed shaft motor 1, a coupling 2, a transmission frame 3, a high-speed shaft upper bearing box 4, a driven sprocket 5, a low-speed bearing box 6, a quick-opening manhole 7, a support 9, a low-speed stirrer 11, a high-speed stirrer 14, a high-speed shaft 15, a support plate 17, a sprocket box 19, a driving sprocket 20, a chain 21, a reducer 22, Low-speed shaft motor 23, adjustable top plate 24 and low-speed shaft 25; high-speed shaft 15 and low-speed shaft 25 are coaxially arranged, and low-speed shaft 25 is hollow, high-speed shaft 15 is passed through low-speed shaft 25, and extends downward after passing through low-speed shaft 25, and low-speed shaft 25 is located in low-speed bearing box 6; low-speed bearing box 6 is fixed with connecting flange, and the connecting end of cylinder 12 and connecting flange is fixed with flange top cover 18, and flange top cover 18 is provided with threaded hole, and bolt is screwed into threaded hole after passing through connecting flange, and sealing ring is provided between the sealing surface of connecting flange and flange top cover 18. The low-speed shaft motor 23 drives the driving sprocket 20 to rotate after being decelerated by the reducer 22, and then drives the driven sprocket 5 to rotate through the chain 21. The driven sprocket 5 is fixedly connected to the low-speed shaft 25, thereby realizing that the low-speed shaft motor 23 drives the low-speed shaft 25 to rotate; the connection between the motor and the reducer, the reducer and the sprocket chain, as well as the transmission structure and distance are the same as those in the prior art, and will not be repeated here. Since the high-speed shaft 15 is inserted into the low-speed shaft 25, there must be a gap between the two, which will cause leakage. For this reason, in this embodiment, see Figure 2As shown, a high-speed shaft lower bearing seat 26, a high-speed shaft lower bearing 31 and a high-speed shaft lower bearing cover 28 are provided at the lower end of the low-speed shaft 25. The high-speed shaft lower bearing seat 26 and the lower end of the low-speed shaft 25 are fixedly connected by welding. Preferably, the high-speed shaft lower bearing seat 26 and the lower end of the low-speed shaft 25 are connected by full-circle welding, so that the connection between the high-speed shaft lower bearing seat 26 and the low-speed shaft 25 can be ensured to be in an unsealed state. A first O-ring 29 and a first oil seal 30 are arranged between the high-speed shaft lower bearing cover 28 and the high-speed shaft 15. By arranging the first oil seal and the first O-ring seal between the high-speed shaft and the low-speed shaft, and cooperating with the bearing box and the bearing, the high-speed shaft and the low-speed shaft support can achieve simple and reliable sealing. A second O-ring 27 is arranged between the high-speed shaft lower bearing cover 28 and the high-speed shaft lower bearing seat 26, so that the high-speed shaft lower bearing cover 28 and the high-speed shaft lower bearing seat 26 are reliably sealed, which realizes the relative rotation of the high-speed shaft and the low-speed shaft while ensuring reliable sealing between the two; in addition, there is also relative rotation between the low-speed shaft and the low-speed bearing box 6, so there will be a gap and leakage. To this end, in this embodiment, the low-speed bearing box 6 is provided with a low-speed shaft lower bearing 33 and a low-speed shaft lower bearing cover 32 at the protruding end of the low-speed shaft 25, and a second oil seal 34 and a third O-ring 35 are provided between the low-speed shaft lower bearing cover 32 and the low-speed shaft 25. The second oil seal and the third O-ring are provided between the low-speed shaft and the low-speed bearing box, and the corresponding bearing box and bearing are matched, so that while realizing the rotation of the low-speed shaft, a simple and reliable seal is achieved between the low-speed shaft and the low-speed bearing box; of course, the low-speed shaft lower bearing cover 32 and the low-speed bearing box 6 are detachably fixedly connected by bolts and sealed by O-rings, thereby realizing relative operation and sealing between the low-speed shaft and the low-speed bearing box.

[0018] Of course, in this embodiment, it is preferred that both the first oil seal 30 and the second oil seal 34 be stainless steel PTFE frame oil seals. During subsequent maintenance, only the high-speed shaft lower bearing cover 28 and the low-speed shaft lower bearing cover 32 need to be removed to remove and replace the first oil seal 30 and the second oil seal 34 therein. This operation is simple, and the stainless steel PTFE frame oil seals are inexpensive, which effectively reduces operating and maintenance costs.

[0019] In addition, considering that some high-viscosity mixtures will adhere to the inner wall of the cylinder during the stirring process, resulting in insufficient stirring and reaction, for this reason, this embodiment preferably provides a hinged scraper 10 between the low-speed agitator 11 and the inner wall of the cylinder 12, and then the hinged scraper 10 is used to scrape off the mixture adhering to the inner wall of the cylinder 12 so that it can participate in the stirring reaction. It should be noted that the low-speed agitator 11 is a frame-type agitator, and the high-speed agitator 14 is a smaller-sized special-shaped frame-type agitator, such as Figure 1 shown.

[0020] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vacuum-resistant coaxial twin-shaft stirred kettle without mechanical seal, comprising a cylinder (12), characterized in that: The invention also comprises a high-speed shaft motor (1), a high-speed stirrer (14), a high-speed shaft (15), a low-speed shaft motor (23), a low-speed shaft (25) and a low-speed stirrer (11); the high-speed shaft (15) and the low-speed shaft (25) are coaxially arranged, and the low-speed shaft (25) is hollow; the high-speed shaft (15) is inserted into the low-speed shaft (25), and extends downward after passing through the low-speed shaft (25); the low-speed shaft (25) is located in a low-speed bearing box (6); the low-speed bearing box (6) is detachably fixedly connected to the cylinder (12) and sealed; the lower end of the low-speed shaft (25) is provided with a high-speed shaft lower bearing seat (26), a high-speed shaft lower bearing (31) and a high-speed shaft lower bearing cover (28); the high-speed shaft lower bearing seat ( 26) is fixedly connected to the low-speed shaft (25), a first O-ring (29) and a first oil seal (30) are arranged between the high-speed shaft lower bearing cover (28) and the high-speed shaft (15), and a second O-ring (27) is arranged between the high-speed shaft lower bearing cover (28) and the high-speed shaft lower bearing seat (26); the low-speed bearing box (6) is provided with a low-speed shaft lower bearing (33) and a low-speed shaft lower bearing cover (32) at the outlet end of the low-speed shaft (25), a second oil seal (34) and a third O-ring (35) are arranged between the low-speed shaft lower bearing cover (32) and the low-speed shaft (25), and the low-speed shaft lower bearing cover (32) and the low-speed shaft (25) are detachably fixedly connected and sealed.

2. The vacuum-resistant coaxial biaxial stirred kettle without mechanical seal according to claim 1, characterized in that: The high-speed shaft lower bearing seat (26) and the lower end of the low-speed shaft (25) are fixedly connected by welding.

3. The vacuum-resistant coaxial biaxial stirred kettle without mechanical seal according to claim 2, characterized in that: The high-speed shaft lower bearing seat (26) and the lower end of the low-speed shaft (25) are fully welded.

4. The vacuum-resistant coaxial biaxial stirred kettle without mechanical seal according to claim 1, characterized in that: The first oil seal (30) and the second oil seal (34) are both stainless steel polytetrafluoroethylene skeleton oil seals.

5. The vacuum-resistant coaxial biaxial stirred kettle without mechanical seal according to claim 1, characterized in that: The low-speed bearing box (6) is fixedly provided with a connecting flange, and the connecting end of the cylinder (12) and the connecting flange is fixedly provided with a flange top cover (18), and the flange top cover (18) is provided with a threaded hole, and the bolt passes through the connecting flange and is screwed into the threaded hole, and a sealing ring is provided between the sealing surfaces of the connecting flange and the flange top cover (18).

6. The vacuum-resistant coaxial biaxial stirred kettle without mechanical seal according to claim 1, characterized in that: A hinged scraper (10) is provided between the low-speed stirrer (11) and the inner wall of the cylinder (12).

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