Centrifugal fan for circularly conveying high-temperature and high-pressure gas

Abstract

The invention relates to the technical field of fans, in particular to a centrifugal fan for circulating conveying of high-temperature and high-pressure gas. The draught fan comprises a draught fan body, the draught fan body comprises an impeller set and a motor set, a heat insulation assembly is arranged between the motor set and the impeller set, the heat insulation assembly is used for blocking heat generated by the impeller set, meanwhile, the heat insulation assembly can further support and position the space between a volute and a motor shell, and an end cover mechanism is arranged on the side, away from the volute, of the motor shell. The end cover mechanism can cool the motor set and does not consume electric energy to heat gas. The heat insulation assembly is installed between the volute and the motor shell, so that the volute and the motor set can be supported and positioned, it is guaranteed that the volute and the motor set are in a concentric state, meanwhile, the heat transfer from the volute to the motor side can be reduced through the arrangement of the heat insulation assembly, and the service life of the motor set is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a centrifugal fan for circulating and transporting high-temperature and high-pressure gas. Background Art

[0002] Tire heating and vulcanization is an important step in the tire manufacturing process. It involves converting tire materials into rubber products with specific properties and structures through heating and chemical reactions. The main purpose of tire heating and vulcanization is to make the rubber and additives in the tire material react chemically under specific temperature and pressure, that is, vulcanization reaction. This process will solidify the tire material and achieve ideal properties, including hardness, strength, wear resistance and elasticity.

[0003] The fan used in the tire heating and vulcanization process plays an important role in the vulcanization process. It is mainly used for the circulation and transportation of high-temperature and high-pressure gases, requiring zero leakage and high temperature resistance. The existing centrifugal fans rely on the labyrinth seal at the root of the impeller, which cannot achieve zero leakage under high pressure. The volute and the motor housing are directly connected. The volute and the impeller transport 200-degree high-temperature gases, while the general motor has a temperature resistance of only 70 to 80 degrees. The heat will be conducted along the volute to the motor, and the motor needs to be cooled by water or oil to maintain a low temperature. In this way, the heat dissipation power consumption of the entire system will be relatively large, resulting in a large waste of energy. In view of this, we propose a centrifugal fan for the circulation and transportation of high-temperature and high-pressure gases. Summary of the invention

[0004] The object of the present invention is to provide a centrifugal fan for circulating and transporting high-temperature and high-pressure gas to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides a centrifugal fan for circulating and transporting high-temperature and high-pressure gas, comprising a fan body, the fan body comprising an impeller group and a motor group, the impeller group and the motor group are connected by connecting bolts, a sensor is installed inside the motor group near the impeller group, the impeller group is composed of a volute and an impeller body, and the impeller body is rotatably arranged inside the volute;

[0006] The motor group includes a motor housing, which is a sealed structure. A stator and a rotor are arranged inside the motor housing. The rotor is located inside the stator and supported by a magnetic bearing. One end of the rotor is connected to an impeller body, and an axial thrust bearing is installed on a side of the rotor away from the impeller body.

[0007] A heat insulation component is provided between the motor group and the impeller group, and the heat insulation component is used to block the heat generated by the impeller group, and the heat insulation component can also support and position the volute and the motor housing;

[0008] An end cover mechanism is provided on the side of the motor housing away from the volute, and the end cover mechanism can cool the motor group without consuming electrical energy to heat the gas.

[0009] As a further improvement of the present technical solution, the thermal insulation assembly includes a ceramic ring arranged between the motor housing and the volute, an insulation pad is provided on the inner side of the ceramic ring, a sealing ring is installed on the surface of the ceramic ring, and an external thermal insulation member is provided on the outer wall of the volute.

[0010] As a further improvement of the technical solution, the end cover mechanism includes a bottom cover installed on the side of the motor housing away from the volute, and a rear air outlet is opened in the middle of the bottom cover.

[0011] As a further improvement of the technical solution, the side cooling of the motor group adopts high-temperature oil cooling technology to reduce the temperature difference between the motor group and the impeller group.

[0012] As a further improvement of the technical solution, the sensor and the motor coil are both made of temperature-resistant materials.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In the centrifugal fan for circulating and transporting high-temperature and high-pressure gas, the heat insulation component is installed between the volute and the motor housing, so that the volute and the motor group can be supported and positioned to ensure that the volute and the motor group are in a concentric state. At the same time, the setting of the heat insulation component can also reduce the heat transfer from the volute to the motor side, thereby prolonging the service life of the motor group;

[0015] 2. In the centrifugal fan used for circulating and transporting high-temperature and high-pressure gas, the motor housing is a fully sealed structure, and the original labyrinth seal at the root of the impeller is eliminated. Since the labyrinth seal is a dynamic seal, the leakage is relatively large, especially when the gas pressure in the volute is high. In this solution, the entire fan has no dynamic seal, but is statically sealed, and the leakage is small;

[0016] 3. In the centrifugal fan used for circulating and transporting high-temperature and high-pressure gas, an end cover mechanism is arranged on the side of the motor unit away from the volute, so that the supplementary cold gas flows from the bottom cover of the motor along the gap between the stator and the rotor of the motor to the impeller, which can cool the motor unit without consuming electrical energy to heat the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the component disassembly structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the cutaway structure of the volute of the present invention;

[0020] Figure 4 It is a schematic diagram of the structure of the heat insulation assembly of the present invention;

[0021] Figure 5 It is a schematic diagram of the overall cutaway structure of the present invention.

[0022] The meaning of each number in the figure is:

[0023] 1. Fan body;

[0024] 11. impeller assembly; 111. volute; 112. impeller body;

[0025] 12. Motor group; 121. Stator; 122. Rotor; 123. Motor housing; 124. Magnetic bearing; 125. Axial thrust bearing;

[0026] 13. End cover mechanism; 131. Bottom cover; 132. Rear air outlet;

[0027] 14. Connecting bolts;

[0028] 15. Sensor;

[0029] 2. Thermal insulation assembly; 21. Ceramic ring; 22. Thermal insulation pad; 23. Sealing ring; 24. External thermal insulation component. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example

[0032] See also Figure 1-Figure 5 As shown, the purpose of this embodiment is to provide a centrifugal fan for circulating and transporting high-temperature and high-pressure gas, including a fan body 1, the fan body 1 includes an impeller group 11 and a motor group 12, the impeller group 11 and the motor group 12 are connected by connecting bolts 14, a sensor 15 is installed inside the motor group 12 close to the impeller group 11, the impeller group 11 is composed of a volute 111 and an impeller body 112, the impeller body 112 is rotatably arranged inside the volute 111, and the impeller body 112 is reinforced by locking bolts;

[0033] The motor group 12 includes a motor housing 123, which is a sealed structure. A stator 121 and a rotor 122 are arranged inside the motor housing 123. The rotor 122 is located inside the stator 121 and supported by a magnetic bearing 124. One end of the rotor 122 is connected to the impeller body 112. An axial thrust bearing 125 is installed on the side of the rotor 122 away from the impeller body 112.

[0034] A heat insulation component 2 is provided between the motor group 12 and the impeller group 11, and the heat insulation component 2 is used to block the heat generated by the impeller group 11, and the heat insulation component 2 can also support and position the volute 111 and the motor housing 123;

[0035] An end cover mechanism 13 is provided on a side of the motor housing 123 away from the volute 111 . The end cover mechanism 13 can cool the motor group 12 while heating the gas without consuming electrical energy.

[0036] First, the specific structure of the heat insulation component 2 is disclosed. The heat insulation component 2 includes a ceramic ring 21 arranged between the motor housing 123 and the volute 111, a heat insulation pad 22 is arranged on the inner side of the ceramic ring 21, a sealing ring 23 is installed on the surface of the ceramic ring 21, and an outer heat insulation member 24 is arranged on the outer wall of the volute 111. By installing the ceramic ring 21 between the motor housing 123 and the volute 111, the positioning effect can be achieved, ensuring that the impeller group 11 and the motor group 12 remain concentric. At the same time, by using the ceramic ring 21 and the heat insulation pad 22 and the sealing ring 23 installed on its surface, the heat generated in the volute 111 can be reduced from being transferred from the volute 111 to the motor group 12, thereby reducing the temperature in the motor group 12, thereby reducing the cooling of the motor group 12, and then reducing the waste of energy.

[0037] Next, the specific structure of the end cover mechanism 13 is disclosed. The end cover mechanism 13 includes a bottom cover 131 installed on the side of the motor housing 123 away from the volute 111, and a rear air outlet 132 is opened in the middle of the bottom cover 131. It can be seen that by opening the rear air outlet 132 in the middle of the bottom cover 131 installed at the end of the motor housing 123, the system supplementary cold gas can enter the inside of the motor housing 123 from the rear air outlet 132, and the gas then flows to the impeller body 112 along the gap between the stator 121 and the rotor 122, which can not only cool the motor group 12, but also save the electricity required to heat the cold gas.

[0038] Since the temperature of the motor casing 123 is low, the heat generated at the volute 111 will be transferred to the motor casing 123. Therefore, in order to reduce the heat transfer between the volute 111 and the motor casing 123, the side cooling of the motor group 12 adopts high-temperature oil cooling technology to reduce the temperature difference between the motor group 12 and the impeller group 11.

[0039] The improvement lies in: by adopting high-temperature oil cooling technology for the side cooling of the motor group 12, the motor group 12 side is in a high-temperature state, reducing the temperature difference between the motor group 12 and the impeller group 11, thereby reducing the heat transfer from the volute 111 to the motor casing 123. Since the motor casing 123 is in a sealed state, the heat from the high-temperature oil cooling technology will not affect the temperature inside the motor casing 123, thereby ensuring that the motor group 12 can operate normally.

[0040] Among them, high-temperature oil cooling technology is a special cooling method, which is mainly used to maintain the motor group 12 at a relatively high temperature even close to the temperature of the impeller group 11, so that the heat transferred from the volute 111 side to the motor group 12 side is very small.

[0041] Although the internal temperature of the motor group 12 is isolated by the ceramic ring 21, the motor group 12 adopts high-temperature oil cooling technology to balance the temperature difference between the motor group 12 and the impeller group 11. Therefore, in order to ensure that the internal components of the motor group 12 can operate normally, the sensor 15 and the motor coil are made of temperature-resistant materials.

[0042] The improvement lies in that the motor coil and the sensor 15 are made of high temperature resistant materials. When the temperature of the motor group 12 is controlled at a temperature close to that of the volute 111, the operation of the motor coil and the sensor 15 is not affected, and the overall operation of the fan body 1 is not affected.

[0043] In summary, the working principle of this solution is as follows: first, the impeller group 11 is connected to the motor group 12 by the connecting bolts 14 to form a fan body 1, and then the ceramic ring 21 is installed between the motor housing 123 and the volute 111, which can achieve the positioning effect and ensure that the impeller group 11 and the motor group 12 are kept in a concentric state. At the same time, the ceramic ring 21 and the heat insulation pad 22 and the sealing ring 23 installed on the surface thereof can also reduce the heat generated in the volute 111 from the volute 111 to the motor group 12 The transfer situation, thereby reducing the temperature in the motor group 12;

[0044] A rear air outlet 132 is provided in the middle of the bottom cover 131 installed at the end of the motor housing 123, so that the system supplementary cold gas can enter the interior of the motor housing 123 from the rear air outlet 132, and the gas then flows along the gap between the stator 121 and the rotor 122 to the impeller body 112, which can not only cool the motor group 12, but also save the electricity required to heat the cold gas;

[0045] The side cooling of the motor group 12 adopts high-temperature oil cooling technology, so that the side of the motor group 12 is in a high-temperature state, reducing the temperature difference between the motor group 12 and the impeller group 11, thereby reducing the heat transferred from the volute 111 to the motor casing 123. Because the motor casing 123 is in a sealed state, the heat of the high-temperature oil cooling technology will not affect the temperature inside the motor casing 123, ensuring that the motor group 12 can operate normally. Among them, the motor coil and the sensor 15 are made of high-temperature resistant materials and do not affect the overall operation of the fan body 1.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A centrifugal fan for circulating and transporting high-temperature and high-pressure gas, comprising a fan body (1), wherein the fan body (1) comprises an impeller group (11) and a motor group (12), wherein the impeller group (11) and the motor group (12) are connected via connecting bolts (14), and a sensor (15) is installed inside a side of the motor group (12) close to the impeller group (11), characterized in that: The impeller assembly (11) is composed of a volute (111) and an impeller body (112), and the impeller body (112) is rotatably arranged inside the volute (111); The motor group (12) comprises a motor housing (123), the motor housing (123) is a sealed structure, a stator (121) and a rotor (122) are arranged inside the motor housing (123), the rotor (122) is located inside the stator (121), and the rotor (122) is supported by a magnetic bearing (124), one end of the rotor (122) is connected to the impeller body (112), and an axial thrust bearing (125) is installed on a side of the rotor (122) away from the impeller body (112); A heat insulation component (2) is provided between the motor group (12) and the impeller group (11), and the heat insulation component (2) is used to block the heat generated by the impeller group (11), and the heat insulation component (2) can also support and position the volute (111) and the motor housing (123); An end cover mechanism (13) is provided on a side of the motor housing (123) away from the volute (111); the end cover mechanism (13) can cool the motor group (12) while heating the gas without consuming electrical energy.

2. The centrifugal fan for circulating and transporting high-temperature and high-pressure gas according to claim 1, characterized in that: The heat insulation component (2) comprises a ceramic ring (21) arranged between the motor housing (123) and the volute (111); a heat insulation pad (22) is arranged on the inner side of the ceramic ring (21); a sealing ring (23) is installed on the surface of the ceramic ring (21); and an external heat insulation member (24) is arranged on the outer wall of the volute (111).

3. The centrifugal fan for circulating and transporting high-temperature and high-pressure gas according to claim 1, characterized in that: The end cover mechanism (13) comprises a bottom cover (131) mounted on a side of the motor housing (123) away from the volute (111), and a rear air outlet (132) is provided in the middle of the bottom cover (131).

4. The centrifugal fan for circulating and transporting high-temperature and high-pressure gas according to claim 1, characterized in that: The side cooling of the motor group (12) adopts high-temperature oil cooling technology, which is used to reduce the temperature difference between the motor group (12) and the impeller group (11).

5. The centrifugal fan for circulating and transporting high-temperature and high-pressure gas according to claim 1, characterized in that: The sensor (15) and the motor coil are both made of temperature-resistant materials.

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