CN212360808U - Electric air door device output shaft sealing mechanism of refrigerator - Google Patents
Electric air door device output shaft sealing mechanism of refrigerator Download PDFInfo
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- CN212360808U CN212360808U CN202021442619.5U CN202021442619U CN212360808U CN 212360808 U CN212360808 U CN 212360808U CN 202021442619 U CN202021442619 U CN 202021442619U CN 212360808 U CN212360808 U CN 212360808U
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- sealing mechanism
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Abstract
An output shaft sealing mechanism of an electric air door device of a refrigerator is characterized in that an output shaft with a three-stage cylindrical structure is provided with a rubber sealing ring on a No. 3 cylinder in an interference fit manner, and forms an airtight sealing structure with a gear box round sleeve. The output shaft sealing mechanism enables the output shaft and the gear box circular sleeve to achieve reliable and complete sealing, the rotary output torque of the output shaft is not obviously weakened by the addition of the rubber sealing ring in the sealing mechanism, the electric air door is flexibly and smoothly opened and closed, and the electric air door cannot lose efficacy after long-term use.
Description
Technical Field
The utility model relates to a refrigerator electric air door technical field, in particular to refrigerator electric air door device output shaft sealing mechanism.
Background
The electric air door is widely used in air-cooled frostless refrigerators, freezers and the like as a temperature control executing element, and the temperature is controlled by controlling the flow of cold air through opening and closing an air door baffle. The electric air door device driven by the stepping motor has the advantages that the motor is controlled to rotate forwards and reversely by controlling the pulse phase sequence, the opening and closing of the air door are realized by the gear reduction mechanism, and a position detection device is not required, so that the electric air door device is widely applied.
The working environment of the electric air door for the refrigerator has the conditions of alternating temperature, alternating temperature above 0 ℃ and below 0 ℃, alternating air humidity and sometimes supersaturation of humidity to generate condensation or frosting. If the cold motorized damper is exposed to moist and relatively hot air, moisture from the air may condense on the solid surfaces, creating condensation and frost. This could lead to failure or malfunction of the motorized damper action. For this reason, the motor-containing gear box of the electric damper needs to be sealed. The output shaft of the gear box needs to extend out of the gear box to drive the damper baffle to rotate, so that the sealing of the output shaft of the gear box is a difficult point of the sealing technology of the electric damper device.
An output shaft sealing mechanism of an electric air door device of a refrigerator in the prior art is composed of an air door baffle 1, a gear box 2, a box cover 3 and an output shaft 4, and is shown in figure 1. The output shaft 4 is provided with a protruding part 4-1, the cross section of which is non-circular and is matched with a shaft pivot 1-1 with the same non-circular cross section of the air door baffle plate 1; the output shaft 4 is provided with a 1 st cylinder 4-2 which is movably matched and connected with an outlet hole 2-1 of the gear box 2; the output shaft 4 is provided with a 2 nd cylinder 4-5 which is movably matched and connected with the inner wall of the concentric sleeve 2-2 of the gear box 2. Although a concentric sleeve 2-2 is provided at the outlet hole 2-1 of the gear case 2 to extend the fitting length thereof and the fitting surface thereof is coated with grease, complete sealing cannot be achieved. The motorized damper was tested by being submerged in water for 15 minutes at 15kPa external pressure, and about 0.5mL of water was still passing through to the gearbox.
Chinese patent CN104154240A "door pivot mechanism of electric air door with sealing performance" discloses an axle pivot structure of electric air door for preventing water vapor from entering gear box, which adopts multi-stage hole axle fit, but because the door pivot has relative rotation for the gear box output hole, the fit must be movable fit (clearance fit), even if the fit surface is full of lubricating grease, because the interior cavity air of gear box continuously expands and contracts to form the so-called "breathing action" of the internal and external air pressure difference due to sudden cooling and sudden heating, the lubricating grease can be discharged to generate air channel, so that the water vapor can not be completely prevented from entering the gear box.
At present, the main after-sale complaints of the refrigerator with the electric air door still cause the failure of the electric air door due to the fact that water vapor of the electric air door enters the gear box to be frosted, and the temperature of the refrigerator is out of control.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide an output shaft sealing mechanism of an electric air door device of a refrigerator, which can ensure that the output shaft and a round sleeve of a gear box are reliably and completely sealed; the addition of the rubber sealing ring in the sealing mechanism of the rubber sealing ring does not obviously weaken the rotary output torque of the output shaft; the electric air door is flexible and smooth to open and close, and cannot lose efficacy after long-term use.
The utility model provides a technical solution is like this:
an output shaft sealing mechanism of an electric air door device of a refrigerator comprises an air door baffle, a gear box, a box cover and an output shaft, wherein the output shaft is provided with a protruding part with a non-circular cross section and is in matched connection with a pivot with the non-circular cross section of the air door baffle; the output shaft is provided with a 1 st cylinder which is in movable fit connection with an outlet hole of the gear box, and is also provided with a 2 nd cylinder which is in movable fit connection with the inner wall of a concentric sleeve of the gear box; a 3 rd cylinder is also arranged on the 2 nd cylinder at the intersection of the 1 st cylinder and the 2 nd cylinder; the 3 rd cylinder with be equipped with at least one rubber seal between the gear box circle sleeve inner wall, rubber seal is connected for interference fit between 3 rd cylinder face and the circle sleeve inner wall respectively, 3 rd cylindrical axial length is enough to hold the rubber seal who has taken place to warp just still has the axial space, form a shaft shoulder between 1 st cylinder and the 3 rd cylinder.
The number of the rubber sealing rings is 1-2. When 1 rubber seal ring is adopted, the radial interference magnitude of the interference fit with the 3 rd cylinder of the output shaft is 0.1-0.3 mm. When two identical rubber sealing rings are adopted, the radial interference magnitude of the interference fit with the 3 rd cylinder of the output shaft is 0.05-0.2 mm. The 3 rd cylinder of the output shaft is still provided with an axial gap of 0.6-1.2 mm after being arranged into the rubber sealing ring in an interference fit manner.
Compared with the prior art, the utility model discloses following beneficial effect has:
this electric air door device output shaft sealing mechanism of refrigerator adopts the output shaft of tertiary cylinder structure to constitute output shaft seal structure with rubber seal and gear box circle sleeve cooperation, through selecting 1 or 2 rubber seal and making interference fit's preferred radial magnitude of interference with output shaft 3 rd cylinder, and leave suitable axial space here, make and realize reliably, complete sealing between output shaft 3 rd cylinder and the gear box circle sleeve, but the existence of rubber seal does not bring obvious weakening to the rotatory output torque of output shaft, and then guarantee that electric air door opens, close nimble smooth and easy, long-term use can not become invalid.
Drawings
Fig. 1 is a schematic structural diagram of an output shaft sealing mechanism of an electric damper device of a refrigerator in the prior art.
Fig. 2 is a schematic structural view of an output shaft sealing mechanism of an electric air door device of a refrigerator according to the present invention.
Fig. 3 is a partially enlarged schematic view of fig. 2.
The reference numbers in the figures denote: 1. a damper; 1-1. pivot; 2. a gear case; 2-1, an outlet hole; 2-2. round sleeve; 3. a box cover; 4. an output shaft; 4-1, an extension; 4-2, column 1; 4-3, shaft shoulder; 4-4. column 3; 4-5, 2 nd cylinder; 5. a rubber seal ring.
Detailed Description
The present invention is further illustrated by the following examples.
Referring to fig. 2 and 3, an output shaft sealing mechanism of an electric air door device of a refrigerator comprises an air door baffle 1, a gear box 2, a box cover 3 and an output shaft 4, wherein the output shaft 4 is provided with a protruding part 4-1 with a non-circular cross section and is connected with a pivot 1-1 with the non-circular cross section of the air door baffle 1 in a matching way; the output shaft 4 is provided with a 1 st cylinder 4-2 which is in movable fit connection with an outlet hole 2-1 of the gear box 2, and the output shaft 4 is also provided with a 2 nd cylinder 4-5 which is in movable fit connection with the inner wall of a concentric sleeve 2-2 of the gear box 2; a 3 rd cylinder 4-4 is also arranged on a 2 nd cylinder 4-5 at the intersection of the 1 st cylinder 4-2 and the 2 nd cylinder 4-5; at least one rubber sealing ring 5 is arranged between the 3 rd cylinder 4-4 and the inner wall of the gear box circular sleeve 2-2, the rubber sealing ring 5 is in interference fit connection with the 3 rd cylinder 4-4 and the inner wall of the circular sleeve 2-2 respectively, the 3 rd cylinder 4-4 can accommodate the deformed rubber sealing ring 5 in the axial length and still has an axial gap, and a shaft shoulder 4-3 is formed between the 1 st cylinder 4-2 and the 3 rd cylinder 4-4. The number of the rubber sealing rings 5 is 1-2.
The design principle and the working process of the output shaft sealing mechanism of the electric air door device of the refrigerator are as follows: the air door baffle 1 synchronously rotates along with the output shaft 4 due to the adoption of the matching of the non-circular cross section, and the output shaft 4 is provided with a 1 st cylinder 4-2 which is in movable fit connection with an outlet hole 2-1 of the gear box 2 and a 2 nd cylinder 4-5 which is in movable fit connection with the inner wall of a circular sleeve 2-2 of the gear box 2, so that the output shaft 4 can freely rotate around the center of the outlet hole 2-1; because the output shaft 4 and the last-stage sector gear of the gear box 2 are integrated and are driven to rotate by the gear reduction mechanism, the shaft shoulder 4-3 positioned between the 1 st cylinder 4-2 and the 3 rd cylinder 4-4 can prevent the axial float of the output shaft 4, the rubber sealing ring 5 arranged on the 3 rd cylinder 4-4 in the three-stage cylinder of the output shaft 4 can rotate relatively, but the rubber sealing ring 5 can generate elastic deformation due to interference fit, so that the sealing can be completely and effectively realized, and the external air is prevented from entering and exiting the gear box due to air pressure difference. And sealing structures such as glue seals are adopted between the box cover 4 and the gear box 2, so that the gear box can be completely sealed, and external water vapor is prevented from entering.
In order to reduce the rotation resistance of the output shaft 4, the radial interference of the interference fit is larger when one rubber seal is used, and the radial interference of the interference fit may be smaller when 2 identical rubber seals are used for sealing.
The air door baffle 1, the gear box 2, the box cover 3 and the output shaft 4 are all formed by plastic injection molding, and the rubber sealing ring 5 is an O-shaped rubber sealing ring of nitrile rubber which meets the standard specification of JB/T6659 and 2007 pneumatic O-shaped rubber sealing ring size series and tolerance.
Because the electric air door device adopts a micromotor with power less than 5W, the rotary output torque of the micromotor is not more than 2kgf-cm, and the rubber sealing ring 5 arranged on the output shaft 4 can increase the friction force with the inner wall of the circular sleeve 2-2 to obviously reduce the output torque, the electric air door is not easy to open and close, and even fails.
In order to overcome the defect, when 1 rubber sealing ring 5 is adopted, the radial interference magnitude of the interference fit with the 3 rd cylinder 4-4 of the output shaft is 0.1-0.3 mm. When two identical rubber sealing rings 5 are adopted, the radial interference magnitude of the interference fit with the 3 rd cylinder 4-4 of the output shaft is 0.05-0.2 mm. And an axial gap of 0.6-1.2 mm is still left after the 3 rd cylinder 4-4 of the output shaft is arranged in the rubber sealing ring 5 in an interference fit manner.
The rubber seal 5 and the mating surfaces between all moving parts may be greased to further reduce the rotational resistance of the output shaft 4.
According to the sealing mechanism of the output shaft of the electric air door device, a single O-shaped rubber sealing ring 5 is adopted, through a detection test, the electric air door is soaked in water for 15 minutes under the external pressure of 15kPa, and no water enters the gear box completely; under the same motor and the same driving voltage, the rotating output torque of the damper baffle 1 still meets the technical requirements, and the output torque is not obviously weakened due to friction force.
Claims (5)
1. An output shaft sealing mechanism of an electric air door device of a refrigerator comprises an air door baffle (1), a gear box (2), a box cover (3) and an output shaft (4), wherein the output shaft (4) is provided with a protruding part (4-1) with a non-circular cross section and is in matched connection with a pivot (1-1) with a non-circular cross section of the air door baffle (1); the output shaft (4) is provided with a 1 st cylinder (4-2) which is connected with an outlet hole (2-1) of the gear box (2) in a movable fit manner, and the output shaft (4) is also provided with a 2 nd cylinder (4-5) which is connected with the inner wall of a concentric circular sleeve (2-2) of the gear box (2) in a movable fit manner; the method is characterized in that: a No. 3 cylinder (4-4) is also arranged on a No. 2 cylinder (4-5) at the intersection of the No. 1 cylinder (4-2) and the No. 2 cylinder (4-5); the 3 rd cylinder (4-4) with be equipped with at least one rubber seal (5) between the circle sleeve (2-2) inner wall, rubber seal (5) are connected for interference fit with 3 rd cylinder (4-4) cylinder and circle sleeve (2-2) inner wall respectively, the axial length of 3 rd cylinder (4-4) can hold rubber seal (5) that have taken place to warp and still have the axial space, form a shaft shoulder (4-3) between 1 st cylinder (4-2) and 3 rd cylinder (4-4).
2. The electric damper device output shaft sealing mechanism for refrigerator according to claim 1, characterized in that: the number of the rubber sealing rings (5) is 1-2.
3. The electric damper device output shaft sealing mechanism for refrigerator according to claim 1 or 2, characterized in that: when 1 rubber seal ring (5) is adopted, the radial interference magnitude of the interference fit with the 3 rd cylinder (4-4) of the output shaft is 0.1-0.3 mm.
4. The electric damper device output shaft sealing mechanism for refrigerator according to claim 1 or 2, characterized in that: when two identical rubber sealing rings (5) are adopted, the radial interference magnitude of the interference fit with the 3 rd cylinder (4-4) of the output shaft is 0.05-0.2 mm.
5. The electric damper device output shaft sealing mechanism for refrigerator according to claim 1, characterized in that: the 3 rd cylinder (4-4) is still provided with an axial gap of 0.6-1.2 mm after being arranged in the rubber sealing ring (5) in an interference fit manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021442619.5U CN212360808U (en) | 2020-07-21 | 2020-07-21 | Electric air door device output shaft sealing mechanism of refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021442619.5U CN212360808U (en) | 2020-07-21 | 2020-07-21 | Electric air door device output shaft sealing mechanism of refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212360808U true CN212360808U (en) | 2021-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021442619.5U Active CN212360808U (en) | 2020-07-21 | 2020-07-21 | Electric air door device output shaft sealing mechanism of refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212360808U (en) |
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2020
- 2020-07-21 CN CN202021442619.5U patent/CN212360808U/en active Active
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