Motor shaft anti-steam sealing structure and double-cavity steam fryer thereof

Abstract

The utility model relates to a steam-proof sealing structure of a motor shaft and a double-cavity steam fryer thereof, which are designed for solving the technical problem that the steam circulation effect in a cavity is poorer when a motor rotates at a low speed due to the fact that the sealing position of the motor shaft of the existing similar product is lack of a reserved gap and the low-speed rotation of the motor is easily influenced. The steam-proof sealing structure is characterized in that the shaft sleeve of the steam-proof sealing structure is in clearance fit with the silica gel sealing ring A, and 0.5-1mm of clearance M is reserved. When the gap is too small, the motor is easy to scrape and get stuck when rotating at a low speed; and when the gap is too large, the steam leakage is too large and a water film cannot be formed, so that the steam leaks upwards and the short-circuit risk of electrical components is caused. The silica gel sealing ring A is packaged and fixed in the silica gel sealing ring pressing plate through the silica gel sealing ring bottom plate of the groove in the inner side of the silica gel sealing ring B at the bottom of the silica gel sealing ring pressing plate, and meanwhile the ring groove in the top of the silica gel sealing ring A is buckled with the lower bent edge of the hole opening in the center hole of the silica gel sealing ring bottom plate.

Description

Technical Field

[0001] The utility model relates to a steam fryer, in particular to a steam-proof sealing structure for a motor shaft and a double-chamber steam fryer. Background Art

[0002] A steam air fryer is a household appliance that combines the functions of an air fryer and a steam oven. Among them, an air fryer is a new type of household appliance that uses high-speed air circulation technology to fry food. The food made by it can reduce 80% of the grease compared with a traditional electric fryer, is easy to clean in daily use, and is safe and economical, so it is very popular among people. Some of these air fryers have a steam function and a motor shaft sealing structure design, such as the application number 202220534978.6 disclosed in the Chinese patent literature, the authorization announcement date is August 19, 2022, and the utility model name is "a motor installation sealing structure and a steam fryer"; however, there is no gap reserved at the motor shaft seal of the above products and similar products, which is likely to cause scratching and jamming when the motor rotates at a low speed. When the gap is too large, it is easy to cause steam to leak upward, posing a risk of short circuit of electrical components. Summary of the Invention

[0003] To overcome the above deficiencies, the purpose of the present utility model is to provide a steam-proof sealing structure for a motor shaft and a double-chamber steam fryer to the art, so as to solve the technical problem that there is no gap reserved at the motor shaft seal of existing similar products, which is likely to affect the low-speed rotation of the motor, resulting in poor steam circulation effect in the cavity when the motor rotates at a low speed. Its purpose is achieved by the following technical solutions.

[0004] A steam-proof sealing structure for a motor shaft. The steam sealing structure assembly of this steam-proof sealing structure is arranged on the top plane of the stainless-steel heat-insulating inner layer in the head above the pot mouth of the inner and outer pots of the machine body. The bottom silicone rubber sealing ring B of the silicone rubber sealing ring pressing plate of the steam sealing structure assembly abuts and seals against the top of the stainless-steel heat-insulating inner layer. There is a shaft sleeve passing through the central hole of the silicone rubber sealing ring pressing plate, the inner hole of the silicone rubber sealing ring A with an inner diameter at the central hole of the silicone rubber sealing ring pressing plate, and the shaft hole of the stainless-steel heat-insulating layer. Both ends of the shaft sleeve are fixed between the stainless-steel centrifugal fan and the silicone rubber sealing ring pressing plate by stainless-steel nuts provided on the motor shaft extending through the keyway holes at the stainless-steel centrifugal fan. The motor shaft passes through the shaft sleeve and is connected to the stainless-steel centrifugal fan. The stainless-steel centrifugal fan is arranged in the bottom groove of the stainless-steel heat-insulating inner layer in the head above the pot mouth of the inner and outer pots of the machine body. There is a stainless-steel heating tube in the bottom groove of the stainless-steel heat-insulating inner layer below the stainless-steel centrifugal fan. There is a plastic centrifugal fan arranged on the motor shaft and also in the plastic heat-insulating inner layer at the top of the stainless-steel heat-insulating inner layer. There is an exhaust steam port at the outlet of the plastic heat-insulating inner layer on one side of the head. The motor and the stainless-steel heating tube at the motor shaft are connected to the PCB control component, the AC electromagnetic water pump, the steam generator, and the snap-action temperature limiter in the head through wires. The AC electromagnetic water pump is connected to the water tank valve body component of the water tank assembly through a water inlet pipe. The nozzle of the steam generator is arranged on one side of the bottom groove of the stainless-steel heat-insulating inner layer in the head above the pot mouth of the inner and outer pots of the machine body. The key design point of its structure is that there is an interference fit between the shaft sleeve and the silicone rubber sealing ring A, and a gap M of 0.5 - 1 mm is reserved. When the above gap is too small, it is easy to cause scratching and jamming during low-speed rotation of the motor; when the gap is too large, the steam leakage is too large to form a water film, which easily leads to upward steam leakage and poses a risk of short-circuit of electrical components.

[0005] The silicone rubber sealing ring A is encapsulated and fixed in the silicone rubber sealing ring pressing plate through the silicone rubber sealing ring bottom plate in the inner groove at the bottom of the silicone rubber sealing ring B of the silicone rubber sealing ring pressing plate. At the same time, the circular groove at the top of the silicone rubber sealing ring A is buckled with the downward-bent edge of the hole at the center of the silicone rubber sealing ring bottom plate. The above structure facilitates the fixing and assembly of the silicone rubber sealing ring A, thereby improving the stability of the silicone rubber sealing ring A and ensuring the stability of the interference fit between the above motor shaft and the silicone rubber sealing ring A.

[0006] One end of the shaft sleeve is limited and fixed between the silicone rubber sealing ring pressing plate and the plastic centrifugal fan through a stainless-steel gasket A. The other end of the shaft sleeve is fixed between the stainless-steel centrifugal fan and the silicone rubber sealing ring pressing plate by stainless-steel gaskets B and C on both sides of the keyway hole at the stainless-steel centrifugal fan and a stainless-steel nut provided on the motor shaft extending through the keyway hole at the stainless-steel centrifugal fan. The above is the specific shaft sleeve fixing structure.

[0007] A pot body sealing ring is provided at the mouth of the stainless-steel heat-insulating inner layer inside the machine body. The end of the pot body sealing ring protrudes above the mouth of the stainless-steel heat-insulating inner layer and the plane at the mouth. At the same time, the end of the pot body sealing ring abuts and seals against the edge of the pot mouth of the outer pot body. Thus, when the pot body assembly is placed inside the machine body, the seal between the outer pot body and the stainless-steel heat-insulating inner layer can be achieved, preventing steam leakage and improving the cooking effect of steam.

[0008] While the protrusion of the pot body sealing ring at the mouth of the stainless-steel heat-insulating inner layer above the outer pot body inside the machine body is higher, there is a gap of 1-2 mm reserved between the pot mouth at the upper edge of the pot body. The above is convenient for the basket assembly on the side of the machine body opening to be placed, and the abutting seal between the outer pot body and the pot body sealing ring is achieved.

[0009] An NTC temperature sensor with a probe protruding is provided on one side of the bottom groove of the stainless-steel heat-insulating inner layer inside the head above the pot mouths of the inner and outer pot bodies of the machine body. The NTC temperature sensor inside the head is connected to the PCB control assembly through a circuit. The above NTC temperature sensor is convenient for monitoring the temperature inside the cavity in real time, and adjusting the temperature through the control program to reach the temperature that meets the food cooking requirements.

[0010] According to the above structural design features, a double-chamber steam fryer with the above-mentioned steam seal structure for the motor shaft, a double chamber is provided with an opening on one side inside the machine body. The lower inner linings in the double chambers of the machine body opening respectively form a heat-insulating metal lining with the stainless-steel heat-insulating inner layer. The stainless-steel heat-insulating inner layer is arranged inside the machine body in a split or integral manner. Basket assemblies are respectively provided in the double chambers of the machine body. The basket assembly includes a handle assembly, an inner wire basket assembly and an outer pot body. The key point of its structural design is that the steam seal structure assembly is provided on at least one side of the head. The above steam seal structure and steam fryer are not limited to being used in a single steam cavity, and are also applicable to double chambers or multiple cooking cavities. One side of the double-chamber steam fryer can also be set as the structure of an existing air fryer without a steam function.

[0011] The structure design of the present utility model is reasonable, convenient for production and assembly, and has a good sealing effect. Especially for a steam fryer whose motor shaft needs to rotate at a low speed, it can improve the sealing effect better. It is mainly used as a steam seal structure for the motor shaft and its steam fryer, as well as the structural improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic cross-sectional structure view of an embodiment of the present utility model, and part A in the figure is framed.

[0013] Figure 2 is Figure 1 The enlarged view of part A of

[0014] Figure 3 is Figure 1 The exploded structure view of the steam seal structure assembly of

[0015] Figure 4 is Figure 1 Schematic diagram of the internal structure of the machine head, with the top cover shell omitted in the figure.

[0016] Reference numerals and names of the attached drawings: 1. PCB control component; 2. Steam sealing structure component; 201. Motor shaft; 202. Stainless steel gasket A; 203. Bush; 204. Silicone rubber seal pressing plate; 205. Silicone rubber seal A; 2051. Bent edge under the orifice; 206. Silicone rubber seal bottom plate; 207. Silicone rubber seal B; 208. Stainless steel heat insulation inner layer; 209. Stainless steel gasket B; 210. Stainless steel centrifugal fan; 211. Stainless steel gasket C; 212. Stainless steel nut; 3. Stainless steel heating tube; 4. Handle assembly; 5. Inner wire basket assembly; 6. Outer pot body; 7. Lower inner lining; 8. Pot body seal ring; 9. Exhaust steam port; 10. Motor; 11. Water tank assembly; 12. Plastic centrifugal fan; 13. Water tank valve body assembly; 14. Water inlet pipe; 15. AC electromagnetic water pump; 16. Steam generator; 17. Bimetallic thermostat; 18. Steam nozzle; 19. NTC temperature sensor; 20. Plastic heat insulation inner layer. Detailed implementation manners

[0017] Now, in combination with the attached drawings, the structure and use of the present utility model will be further described. As Figures 1-4 shown, on one side of the machine body of the double-chamber steam fryer, there is an opening provided with a double chamber. The lower inner linings 7 in the double chambers of the opening of the machine body and the stainless steel heat insulation inner layer 208 respectively form a heat-insulating metal inner lining. The stainless steel heat insulation inner layer is arranged in the machine body in a split or integral manner. In the double chambers of the machine body, there are respectively provided fry basket assemblies. The fry basket assemblies include a handle assembly 4, an inner wire basket assembly 5 and an outer pot body 6. On at least one side inside the machine head, there is provided the steam sealing structure component 2. The steam sealing structure component includes the above-mentioned stainless steel heat insulation inner layer, and a motor shaft 201, a stainless steel gasket A 202, a bush 203, a silicone rubber seal pressing plate 204, a silicone rubber seal A 205, a silicone rubber seal bottom plate 206, a silicone rubber seal B 207, a stainless steel gasket B 209, a stainless steel centrifugal fan 210, a stainless steel gasket C 211 and a stainless steel nut 212.

[0018] The above steam seal structure assembly is arranged on the top plane of the stainless steel heat insulation inner layer in the machine head above the pot mouth of the inner and outer pots of the machine body. The bottom silicone rubber seal ring B of the silicone rubber seal ring pressing plate of the steam seal structure assembly abuts and seals against the top of the stainless steel heat insulation inner layer. A shaft sleeve passes through the central hole of the silicone rubber seal ring pressing plate, the inner hole of the silicone rubber seal ring A with the inner diameter at the central hole of the silicone rubber seal ring pressing plate, and the shaft hole of the stainless steel heat insulation layer. The two ends of the shaft sleeve are respectively fixed between the stainless steel centrifugal fan and the silicone rubber seal ring pressing plate by stainless steel nuts arranged on the motor shaft extending out of the flat key hole at the stainless steel centrifugal fan. There is a clearance fit between the shaft sleeve and the silicone rubber seal ring A, and the clearance M is reserved at 0.5 - 1 mm. The motor shaft passes through the shaft sleeve and is connected to the stainless steel centrifugal fan. The stainless steel centrifugal fan is arranged in the bottom groove of the stainless steel heat insulation inner layer in the machine head above the pot mouth of the inner and outer pots of the machine body. A stainless steel heating tube 3 is arranged in the bottom groove of the stainless steel heat insulation inner layer below the stainless steel centrifugal fan. A plastic centrifugal fan 12 is arranged in the plastic heat insulation inner layer 20 at the top of the stainless steel heat insulation inner layer and is also arranged on the motor shaft. An exhaust steam port 9 is arranged at the outlet of the plastic heat insulation inner layer on one side of the machine head. The motor 10, the stainless steel heating tube at the motor shaft are connected to the PCB control component 1, the AC electromagnetic water pump 15, the steam generator 16, and the sudden jump temperature limiter 17 in the machine head through circuits. The AC electromagnetic water pump is connected to the water tank valve body component 13 of the water tank assembly 11 through the water inlet pipe 14. The nozzle of the steam spray pipe 18 of the steam generator is arranged on one side of the bottom groove of the stainless steel heat insulation inner layer in the machine head above the pot mouth of the inner and outer pots of the machine body.

[0019] The above silicone rubber seal ring A is encapsulated and fixed in the silicone rubber seal ring pressing plate through the silicone rubber seal ring bottom plate in the inner groove at the bottom of the silicone rubber seal ring B of the silicone rubber seal ring pressing plate. At the same time, the ring groove at the top of the silicone rubber seal ring A is buckled with the downward bent edge 2051 of the orifice at the central hole of the silicone rubber seal ring bottom plate. One end of the shaft sleeve is limited and fixed between the silicone rubber seal ring pressing plate and the plastic centrifugal fan through a stainless steel gasket A. The other end of the shaft sleeve is fixed between the stainless steel centrifugal fan and the silicone rubber seal ring pressing plate by stainless steel gaskets B and C on both sides of the flat key hole at the stainless steel centrifugal fan and a stainless steel nut arranged on the motor shaft extending out of the flat key hole at the stainless steel centrifugal fan. A pot body seal ring 8 is arranged at the cover opening of the stainless steel heat insulation inner layer in the machine body. The end protrusion of the pot body seal ring is higher than the cover opening of the stainless steel heat insulation inner layer and the plane at the cover opening. At the same time, the end of the pot body seal ring abuts and seals against the edge of the pot mouth of the outer pot body. The protrusion of the pot body seal ring at the cover opening of the stainless steel heat insulation inner layer above the inner and outer pots of the machine body is higher. At the same time, there is a gap of 1 - 2 mm reserved between the pot body seal ring and the pot mouth at the upper edge of the pot body. An NTC temperature sensor 19 with a probe protruding is arranged on one side of the bottom groove of the stainless steel heat insulation inner layer in the machine head above the pot mouth of the inner and outer pots of the machine body. The NTC temperature sensor in the machine head is connected to the PCB control component through a circuit.

[0020] During use, open the frying basket assembly on the corresponding side, place the food in the inner wire basket assembly of the frying basket assembly, press the steam or air fry cooking function button for the corresponding food, and the NTC temperature sensor automatically adjusts the rotation speed of the corresponding fan blade and the corresponding heating temperature according to the real-time monitored temperature, so as to cook the best food effect. When one side of the steam fryer is the steam fryer function and the other side is the air fryer function, the food can be placed according to the needs of steam cooking or air frying. The above-mentioned steam fryer is also compatible with the air fryer function, but it is more difficult for the air fryer to have the steam fryer function, mainly because the steam tightness requirements at the motor shaft and the inner pot opening of the machine body are relatively high.

[0021] In summary, the double-chamber steam fryer is not limited to the above double-chamber structure design. The steam fryer structure design of the present invention adds a steam function to the traditional single-chamber or double-chamber or multi-chamber air fryer; the seal at the motor shaft is the first guarantee for the functional safety of the steam fryer, especially the clearance fit between the shaft sleeve and the silicone rubber seal ring A, with a reserve of 0.5-1 mm. If the above clearance is too small, it is easy to cause jamming due to scratching during low-speed rotation of the motor; if the clearance is too large, the steam leakage is too large to form a water film, which is easy to cause steam to leak upward, resulting in the risk of electrical component short circuit.

Claims

1. A steam-proof sealing structure for a motor shaft. The steam-sealing structure assembly (2) of the steam-proof sealing structure is arranged on the top plane of the stainless-steel heat-insulating inner layer (208) in the head above the pot opening of the inner and outer pot bodies (6) of the machine body. The bottom silicone rubber sealing ring B (207) of the silicone rubber sealing ring pressing plate (204) of the steam-sealing structure assembly abuts against and seals the top of the stainless-steel heat-insulating inner layer. A shaft sleeve (203) passes through the central hole of the silicone rubber sealing ring pressing plate, the inner hole of the inner-diameter silicone rubber sealing ring A (205) at the central hole of the silicone rubber sealing ring pressing plate, and the shaft hole of the stainless-steel heat-insulating layer. The two ends of the shaft sleeve are respectively fixed between the stainless-steel centrifugal fan (210) and the silicone rubber sealing ring pressing plate by stainless-steel nuts (212) provided on the motor shaft (201) extending out of the flat key hole at the stainless-steel centrifugal fan. The motor shaft passes through the shaft sleeve and is connected to the stainless-steel centrifugal fan (210). The stainless-steel centrifugal fan is arranged in the bottom groove of the stainless-steel heat-insulating inner layer in the head above the pot opening of the inner and outer pot bodies of the machine body. A stainless-steel heating tube (3) is arranged in the bottom groove of the stainless-steel heat-insulating inner layer below the stainless-steel centrifugal fan. A plastic centrifugal fan (12) is arranged in the plastic heat-insulating inner layer (20) at the top of the stainless-steel heat-insulating inner layer and is also arranged on the motor shaft. An exhaust steam port (9) is provided at the outlet of the plastic heat-insulating inner layer on one side of the head. The motor (10), the stainless-steel heating tube at the motor shaft are connected to the PCB control assembly (1), the alternating-current electromagnetic water pump (15), the steam generator (16), and the snap-action thermostat (17) in the head through circuits. The alternating-current electromagnetic water pump is connected to the water tank valve body assembly (13) of the water tank assembly (11) through a water inlet pipe (14). The nozzle of the steam generator at the steam spray pipe (18) is arranged on one side of the bottom groove of the stainless-steel heat-insulating inner layer in the head above the pot opening of the inner and outer pot bodies of the machine body. It is characterized in that The bushing (203) and the silicone rubber sealing ring A (205) are in clearance fit, and the clearance M is reserved at 0.5 - 1 mm.

2. The motor shaft steam-proof sealing structure according to claim 1, wherein The silicone rubber sealing ring A (205) is encapsulated and fixed in the silicone rubber sealing ring pressing plate through the silicone rubber sealing ring bottom plate (206) in the inner groove at the bottom of the silicone rubber sealing ring B (207) of the silicone rubber sealing ring pressing plate (204). At the same time, the ring groove at the top of the silicone rubber sealing ring A is buckled with the downward bending edge (2051) of the orifice at the center hole of the silicone rubber sealing ring bottom plate.

3. The motor shaft anti-steam sealing structure according to claim 1, characterized in that One end of the bushing (203) is limited and fixed between the silicone rubber sealing ring pressing plate (204) and the plastic centrifugal fan blade (12) through the stainless steel gasket A (202). The other end of the bushing is fixed between the stainless steel centrifugal fan blade and the silicone rubber sealing ring pressing plate through the stainless steel gaskets B (209) and C (211) on both sides of the flat key hole of the stainless steel centrifugal fan blade (210), and the stainless steel nut (212) arranged on the motor shaft protruding from the flat key hole of the stainless steel centrifugal fan blade.

4. The motor shaft steam-proof sealing structure according to claim 1, characterized in that A pot body sealing ring (8) is provided at the cover opening of the stainless steel heat insulation inner layer (208) inside the machine body. The end protrusion of the pot body sealing ring is higher than the cover opening of the stainless steel heat insulation inner layer and the plane at the cover opening. At the same time, the end of the pot body sealing ring abuts and seals against the edge of the pot opening of the outer pot body (6).

5. The motor shaft steam-proof sealing structure according to claim 4, characterized in that The protrusion of the pot body sealing ring (8) at the cover opening of the stainless steel heat insulation inner layer (208) above the inner and outer pot bodies (6) of the machine body is higher. At the same time, there is a clearance of 1 - 2 mm reserved between the pot body sealing ring and the pot opening at the upper edge of the pot body.

6. The motor shaft anti-steam sealing structure according to claim 1, characterized in that An NTC temperature sensor (19) with a probe protruding is provided on one side of the bottom groove of the stainless steel heat insulation inner layer (208) inside the machine head above the pot opening of the inner and outer pot bodies (6). The NTC temperature sensor inside the machine head is connected to the PCB control component (1) through a circuit.

7. A double-chamber steam fryer with the motor shaft anti-steam sealing structure according to any one of the above claims 1-6, wherein a double-chamber is provided with an opening on one side of the machine body, and the lower inner linings (7) in the double-chambers with openings of the machine body respectively form heat-insulating metal linings with the stainless steel heat-insulating inner layer (208). The stainless steel heat-insulating inner layer is arranged in the machine body in a split or integral manner. Fryer basket assemblies are respectively arranged in the double-chambers of the machine body. The fryer basket assembly includes a handle assembly (4), an inner wire basket assembly (5) and an outer pot body (6); characterized in that The steam sealing structure assembly (2) is provided on at least one side inside the machine head.

Images