Vacuum sealing structure of oil stirrer of vacuum oil quenching furnace

Abstract

The utility model discloses a vacuum sealing structure of an oil stirrer of a vacuum oil quenching furnace. The sealing structure comprises a base, a stirring shaft, an end cover, a bearing, a wear-resistant shaft sleeve and a rotary oil seal, wherein the stirring shaft rotationally extends outwards from the base; the end cover covers the end part of the base and is detachably connected with the base; the bearing is arranged between the base and the stirring shaft; the first sealing ring is arranged between the wear-resistant shaft sleeve and the end cover, the at least one second sealing ring is arranged between the wear-resistant shaft sleeve and the stirring shaft, and the at least one third sealing ring is arranged between the end cover and the base. According to the sealing structure, the stirring shaft is sleeved with the wear-resistant shaft sleeve, then the wear-resistant shaft sleeve and the end cover are sealed through the rotary oil seal and the first sealing ring, and the wear-resistant shaft sleeve and the stirring shaft are sealed through the second sealing ring, so that the purpose of positive-pressure oil sealing can be achieved, and vacuum negative-pressure sealing can also be achieved.

Description

Technical Field

[0001] The utility model relates to the field of industrial vacuum heat treatment furnaces, and more specifically to a vacuum sealing structure of an oil stirrer of a vacuum oil quenching furnace. Background Art

[0002] If the vacuum motor is not used to seal the entire agitator in a vacuum oil quenching furnace, the agitator shaft must be sealed. The sealing structure must ensure that both the vacuum negative pressure and the positive pressure generated by the oil are leak-proof. In other words, the negative pressure must not leak vacuum, and the positive pressure must not leak oil.

[0003] Conventional structures often use two rotary oil seals installed in reverse. This sealing structure places high demands on the surface roughness and hardness of the agitator shaft sealing surface, making it difficult and costly to manufacture. Surface treatments such as ceramic plating and hard chrome plating are often used. Wear on the sealing surface can lead to leakage, which requires replacement of the entire agitator shaft, resulting in high maintenance costs. Furthermore, rotary oil seals are primarily designed for positive pressure sealing and are not fully suitable for negative pressure and vacuum sealing. After prolonged use, the vacuum seal may become inadequate. Utility Model Content

[0004] In view of the above-mentioned defects in the prior art, the utility model provides a vacuum sealing structure of an oil stirrer of a vacuum oil quenching furnace.

[0005] The technical solution adopted by the utility model to solve its technical problems is: constructing a vacuum sealing structure of an oil agitator of a vacuum oil quenching furnace, the sealing structure comprising a base, a stirring shaft rotatably extending outward from the base, an end cover provided at the end of the base and detachably connected to the base, a bearing provided between the base and the stirring shaft, a wear-resistant sleeve sleeved on the stirring shaft, a rotary oil seal provided between the wear-resistant sleeve and the end cover, a first sealing ring provided between the wear-resistant sleeve and the end cover, at least one second sealing ring provided between the wear-resistant sleeve and the stirring shaft, and at least one third sealing ring provided between the end cover and the base.

[0006] In the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace described in the utility model, a through hole for the agitator shaft to pass through is provided in the middle of the end cover, and a connecting ring which can be connected to the base is provided at the outer edge of the end cover.

[0007] In the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace described in the utility model, at least three fixing holes are provided on the connecting ring, and at least three threaded holes are provided on the base at positions corresponding to the fixing holes.

[0008] In the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace described in the present invention, the inner side surface of the connecting ring is provided with a first annular groove for accommodating the third sealing ring, and the depth of the first annular groove is less than the thickness of the third sealing ring.

[0009] In the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace described in the utility model, a second annular groove is provided on the inner side wall of the through hole on the base for the first sealing ring to be embedded and accommodated, and the depth of the second annular groove is smaller than the width of the first sealing ring.

[0010] In the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace described in the present invention, the agitator shaft is provided with a third annular groove for the second sealing ring to be embedded and accommodated, and the depth of the third annular groove is smaller than the width of the second sealing ring.

[0011] In the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace described in the present invention, a fourth annular groove is provided on the inner side wall of the through hole on the base for the rotary oil seal to be embedded and accommodated, and the depth of the fourth annular groove is smaller than the width of the rotary oil seal.

[0012] The vacuum sealing structure of the oil agitator in a vacuum oil quenching furnace of the present invention has the following beneficial effects: By installing a wear-resistant sleeve on the agitator shaft, then sealing between the wear-resistant sleeve and the end cap with a rotary oil seal and a first sealing ring, and sealing between the wear-resistant sleeve and the agitator shaft with a second sealing ring, the vacuum sealing structure can achieve both positive pressure oil sealing and vacuum negative pressure sealing. Furthermore, by installing a third sealing ring between the end cap and the base, a further vacuum sealing effect can be achieved.

[0013] In this application, by providing a wear-resistant sleeve, the more difficult surface treatment can be transferred from the entire agitator shaft to this smaller wear-resistant sleeve, greatly reducing processing costs. At the same time, when the sealing surface wears, only one wear-resistant sleeve needs to be replaced, avoiding the need to replace the entire agitator shaft, reducing maintenance difficulty and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0015] Figure 1 The utility model is a structural schematic diagram of the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, in the first embodiment of the vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace of the present invention, the sealing structure 10 includes a base 11, a stirring shaft 12 rotatably extending outward from the base 11, an end cover 13 covered at the end of the base 11 and detachably connected to the base 11, a bearing 27 arranged between the base 11 and the stirring shaft 12, a wear-resistant sleeve 14 sleeved on the stirring shaft 12, a rotary oil seal 15 arranged between the wear-resistant sleeve 14 and the end cover 13, a first sealing ring 16 arranged between the wear-resistant sleeve 14 and the end cover 13, at least one second sealing ring 17 arranged between the wear-resistant sleeve 14 and the stirring shaft 12, and at least one third sealing ring 18 arranged between the end cover 13 and the base 11.

[0018] The vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace of the present invention achieves both positive pressure sealing of the oil and vacuum negative pressure sealing by installing a wear-resistant sleeve 14 on the agitator shaft 12, then sealing between the wear-resistant sleeve 14 and the end cover 13 with a rotary oil seal 15 and a first sealing ring 16, and sealing between the wear-resistant sleeve 14 and the agitator shaft 12 with a second sealing ring 17. Furthermore, by installing a third sealing ring 18 between the end cover 13 and the base 11, a further vacuum sealing effect can be achieved.

[0019] In this application, by providing a wear-resistant sleeve 14, the more difficult surface treatment can be transferred from the entire agitator shaft 12 to this smaller wear-resistant sleeve 14, greatly reducing processing costs. At the same time, when the sealing surface is worn, only one wear-resistant sleeve 14 needs to be replaced, avoiding the need to replace the entire agitator shaft 12, reducing maintenance difficulty and maintenance costs.

[0020] In this embodiment, a through hole 19 is provided in the middle of the end cover 13 for the stirring shaft 12 to pass through, and a connecting ring 20 is provided on the outer edge of the end cover 13 to be connected to the base 11 .

[0021] Specifically, the connecting ring 20 is provided with at least three fixing holes 21 , and the base 11 is provided with at least three threaded holes 22 at positions corresponding to the fixing holes 21 .

[0022] When fixing and installing the end cover 13 , bolts may be used to pass through the fixing holes 21 and then be screwed into the threaded holes 22 , thereby achieving fixation of the end cover 13 .

[0023] Preferably, the inner side surface of the connecting ring 20 is provided with a first annular groove 23 for the third sealing ring 18 to be embedded and accommodated, and the depth of the first annular groove 23 is less than the thickness of the third sealing ring 18 .

[0024] After the third sealing ring 18 is installed in the first annular groove 23 , the third sealing ring 18 presses against the surface of the base 11 , thereby achieving sealing.

[0025] Furthermore, a second annular groove 24 is provided on the inner side wall of the through hole 19 on the base 11 for accommodating the first sealing ring 16 . The depth of the second annular groove 24 is smaller than the width of the first sealing ring 16 .

[0026] After the first sealing ring 16 is installed in the second annular groove 24 , the first sealing ring 16 presses against the outer surface of the wear-resistant sleeve 14 , thereby achieving sealing.

[0027] Furthermore, a third annular groove 25 is provided on the stirring shaft 12 for the second sealing ring 17 to be embedded and accommodated. The depth of the third annular groove 25 is smaller than the width of the second sealing ring 17 .

[0028] After the second sealing ring 17 is installed in the third annular groove 25 , the second sealing ring 17 presses against the inner wall surface of the wear-resistant sleeve 14 , thereby achieving sealing.

[0029] Furthermore, a fourth annular groove 26 for accommodating the rotary oil seal 15 is provided on the inner side wall of the through hole 19 on the base 11 . The depth of the fourth annular groove 26 is smaller than the width of the rotary oil seal 15 .

[0030] After the rotary oil seal 15 is installed in the fourth annular groove 26 , the rotary oil seal 15 presses against the outer surface of the wear-resistant sleeve 14 to achieve sealing.

[0031] Furthermore, in this utility model, unless otherwise expressly specified or limited, terms such as "connected," "connected," and "stacked" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0032] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vacuum sealing structure for an oil agitator of a vacuum oil quenching furnace, characterized in that: The sealing structure includes a base, a stirring shaft rotatably extending outward from the base, an end cover provided at the end of the base and detachably connected to the base, a bearing provided between the base and the stirring shaft, a wear-resistant sleeve provided on the stirring shaft, a rotary oil seal provided between the wear-resistant sleeve and the end cover, a first sealing ring provided between the wear-resistant sleeve and the end cover, at least one second sealing ring provided between the wear-resistant sleeve and the stirring shaft, and at least one third sealing ring provided between the end cover and the base.

2. The vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace according to claim 1 is characterized in that: A through hole is provided in the middle of the end cover for the stirring shaft to pass through, and a connecting ring is provided on the outer edge of the end cover which can be connected to the base.

3. The vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace according to claim 2, characterized in that: The connecting ring is provided with at least three fixing holes, and the base is provided with at least three threaded holes at positions corresponding to the fixing holes.

4. The vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace according to claim 2, characterized in that: The inner side surface of the connecting ring is provided with a first annular groove for the third sealing ring to be embedded and accommodated, and the depth of the first annular groove is smaller than the thickness of the third sealing ring.

5. The vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace according to claim 2, characterized in that: A second annular groove for accommodating the first sealing ring is provided on the inner side wall of the through hole on the base, and the depth of the second annular groove is smaller than the width of the first sealing ring.

6. The vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace according to claim 2, characterized in that: The stirring shaft is provided with a third annular groove for the second sealing ring to be embedded and accommodated, and the depth of the third annular groove is smaller than the width of the second sealing ring.

7. The vacuum sealing structure of the oil agitator of the vacuum oil quenching furnace according to claim 2, characterized in that: A fourth annular groove for accommodating the rotary oil seal is provided on the inner side wall of the through hole on the base, and the depth of the fourth annular groove is smaller than the width of the rotary oil seal.

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