A stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly

Abstract

The application discloses a Stirling cryogenic engine crankcase blind hole bearing outer ring taking-out assembly, which comprises an opening and closing cylinder (4), the specification of which is matched with the blind hole of the Stirling cryogenic engine after a pulling shaft (7) is inserted; the pulling shaft (7) has one end inserted into the opening and closing cylinder (4) and the other end provided with a wedge-shaped groove for arranging a wedge-shaped pin (1); the wedge-shaped pin (1); a force-adding gland (6) is internally provided with a wedge-shaped surface matched with the side wall of the wedge-shaped pin (1); a support table (2) is externally provided with a stepped structure matched with the upper edge of the blind hole of the Stirling cryogenic engine and internally provided with a first through hole and a second through hole in communication, wherein the diameter of the first through hole meets the requirement that the opening and closing cylinder (4) can be inserted, and the diameter of the second through hole meets the requirement that the force-adding gland (6) is installed. According to the embodiment of the application, the bearing outer ring is acted on by two-stage amplification, small and deep operation space is adapted, and large pulling-out force is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical equipment, in particular to a Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly. BACKGROUND

[0002] As an important component of an infrared detector assembly, the Stirling cryocooler mainly functions to cool the infrared detector, provide a stable low-temperature environment for the infrared detector chip, reduce the noise of the infrared detector, improve the sensitivity and resolution, and thus improve the infrared imaging effect.

[0003] The crankcase is a box structure, small in size and complex in structure, and is an important part of the Stirling cryocooler. The crankcase has a blind hole structure, and a ball bearing is installed at the blind hole position. Due to process requirements, the bearing at the blind hole position needs to be frequently installed and taken out.

[0004] The installation of the Stirling cryocooler crankcase blind hole bearing usually adopts a transition or interference fit, and the bearing outer ring and the inner wall of the blind hole are also coated with a threaded glue for fastening, which requires the tool or structure for taking out the bearing to provide considerable force. The existing bearing extractor usually adopts a threaded structure, which relies on the force of screwing to pull out the blind hole bearing outer ring. However, when this type of structure is used to pull out the bearing outer ring of the Stirling cryocooler crankcase blind hole, the threaded buckle phenomenon often occurs, and the bearing outer ring cannot be pulled out, so the bearing cannot be pulled out with sufficient force.

[0005] The existing blind hole bearing extractor often needs a larger space in the blind hole to accommodate the bearing outer ring gripping mechanism. However, the distance between the Stirling cryocooler crankcase blind hole bearing and the bottom surface of the blind hole is relatively close, and the conventional fixing structure cannot be used.

[0006] In order to obtain greater pulling force, the bearing outer ring taking-out structure must have a supporting function. The existing taking-out structure adopts a horizontal bar combined with a stand column, which results in a small contact area and a large space requirement. Due to the special structure of the Stirling cryocooler crankcase, the position and space available for providing support for the bearing outer ring taking-out structure are extremely limited. At the same time, the existing bearing outer ring taking-out structure uses a stand column structure, which results in a large pressure on the contact position of the support, which can damage the contact surface during the process of pulling out the bearing outer ring, and thus the existing bearing extractor cannot be used to take out the bearing outer ring under this condition. SUMMARY

[0007] The embodiment of the present application provides a Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly, which is suitable for small and deep operation space and provides large pulling force.

[0008] The embodiment of the present application provides a Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly, which comprises:

[0009] The open-close cylinder 4 is a tubular structure, the inner diameter of which is slightly smaller than the diameter of the pulling shaft 7, the outer diameter of which is slightly smaller than the diameter of the blind hole of the Stirling refrigerator, and the side of which in contact with the blind hole of the Stirling refrigerator is provided with a protruding structure, which matches the blind hole of the Stirling refrigerator after the pulling shaft 7 is inserted;

[0010] The pulling shaft 7, one end of which can be inserted into the open-close cylinder 4, the other end of which is provided with a wedge-shaped groove for setting the wedge-shaped pin 1;

[0011] The wedge-shaped pin 1;

[0012] The force-adding gland 6, which is provided with a wedge-shaped surface matched with the side wall of the wedge-shaped pin 1;

[0013] The support table 2, the outer wall of which is provided with a stepped structure matched with the upper edge of the blind hole of the Stirling refrigerator, and the inner wall of which is provided with a first through hole and a second through hole in communication, wherein the diameter of the first through hole meets the requirement that the open-close cylinder 4 can be inserted, and the diameter of the second through hole meets the requirement that the force-adding gland 6 is installed.

[0014] Optionally, the wedge-shaped groove has a flat surface and an opposite inclined surface, the flat surface is perpendicular to the axial direction of the pulling shaft 7, and the wedge-shaped pin 1 is a horizontal wedge-shaped member matched with the wedge-shaped groove.

[0015] Optionally, the force-adding gland 6 is provided with a third through hole at the end away from the pulling shaft 7, and the size of the third through hole meets the requirement that the other end of the pulling shaft 7 is pulled out.

[0016] Optionally, the support table 2 is provided with a fourth through hole at a position protruding from the table surface of the Stirling refrigerator, the open-close cylinder 4 is provided with a fifth through hole at a corresponding position, and the pulling shaft 7 is provided with a sixth through hole at a corresponding position, so as to insert the insertion pin 3, wherein the sizes of the fifth through hole, the sixth through hole and the insertion pin 3 are matched.

[0017] Optionally, the length of the insertion pin 3 is not longer than the diameter of the first through hole.

[0018] Optionally, the angle of the wedge-shaped surface of the wedge-shaped pin 1 and the wedge-shaped surface of the force-adding gland 6 is 8°-20°.

[0019] Optionally, the second through hole of the support table 2 and the force-adding gland 6 are threadedly matched.

[0020] The embodiment of the application designs a unique two-stage wedge-shaped amplification structure, which acts on the bearing outer ring through two-stage amplification, adapts to small and deep operation space, and provides large pulling-out force.

[0021] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application and to implement the same according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several drawings to designate the same or similar parts. In the drawings:

[0023] Figure 1 An overall structure example of the Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly of the embodiment of the present application;

[0024] Figure 2 A partial structure example of the Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly of the embodiment of the present application;

[0025] Figure 3 A wedge-shaped two-stage amplification example of the Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly of the embodiment of the present application;

[0026] Figure 4 A wedge-shaped two-stage amplification principle example of the Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly of the embodiment of the present application. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0028] The embodiment of the present application provides a Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly, as shown in Figure 1 The embodiment of the present application provides a Stirling cryocooler crankcase blind hole bearing outer ring taking-out assembly, as shown in

[0029] The open-close cylinder 4 is a tubular structure, the inner diameter of which is slightly smaller than the diameter of the pulling shaft 7, the outer diameter of which is slightly smaller than the diameter of the blind hole of the Stirling refrigerator, and the side of which in contact with the blind hole of the Stirling refrigerator is provided with a protruding structure, the specification of the open-close cylinder 4 matches the blind hole of the Stirling refrigerator after the pulling shaft 7 is inserted. For the connection of the bearing outer ring and the extraction structure, the narrow space requirement must be met. In order to provide a stable and reliable connection suitable for small space, the separation cylindrical bearing outer ring 5 tightening structure of the embodiment of the application adopts an open-close cylinder structure with steps, and is matched with an insertion pin and a mandrel (pulling shaft 7) to support it.

[0030] The pulling shaft 7 can be inserted into the open-close cylinder 4 at one end, and a wedge-shaped slot is provided at the other end, which is used to set the wedge-shaped pin 1. As shown in Figure 2 The open-close cylinder 4 includes two parts, which are inserted into the bearing outer ring 5 and then inserted into the pulling shaft 7, the two open-close cylinders are pushed towards the bearing outer ring, firmly clamping the bearing outer ring, and at the same time the insertion pin is screwed in, fixing the open-close cylinder 4 and the pulling shaft 7 together, ensuring that the pulling shaft 7 will not disintegrate when taking out the open-close cylinder 4 and the bearing outer ring 5 together.

[0031] The wedge-shaped pin 1.

[0032] The force-adding gland 6 is provided with a wedge surface matched with the side wall of the wedge-shaped pin 1.

[0033] The support table 2 is provided with a stepped structure matched with the upper edge of the blind hole of the Stirling refrigerator on the outer wall, and is provided with a first through hole and a second through hole in communication, wherein the diameter of the first through hole meets the requirement that the open-close cylinder 4 can be inserted, and the diameter of the second through hole meets the requirement of installation of the force-adding gland 6.

[0034] The two-stage wedge amplification force-adding structure of the embodiment of the application is shown in Figure 3 It includes the following parts:

[0035] The first-stage amplification structure: the wedge-shaped pin 1 and the pulling shaft 7, which are used to move horizontally in the wedge-shaped slot of the pulling shaft, lift the pulling shaft upward, and implement the first-stage amplification of the extraction force.

[0036] The second-stage amplification structure: the force-adding gland 6, the support table 2 and the wedge-shaped pin 1, which use the force-adding gland to provide an initial downward pressure, push the wedge-shaped pin to move horizontally through the wedge surface contact, and realize the second-stage amplification of the extraction force.

[0037] The embodiment of the application designs a unique two-stage wedge amplification structure, which applies the screw tightening force to the bearing outer ring through two-stage amplification, adapts to small and deep operation space, and provides large pulling-out force.

[0038] As shown in Figure 1As shown in some embodiments, the wedge-shaped slot has a flat surface perpendicular to the axial direction of the pulling shaft 7 and an opposite inclined surface, and the wedge-shaped pin 1 is a horizontal wedge-shaped member matching the wedge-shaped slot. In some embodiments, the force-applying gland 6 is provided with a third through hole at the end away from the pulling shaft 7, and the third through hole has a size suitable for the other end of the pulling shaft 7 to be pulled out.

[0039] As shown in some embodiments, the support table 2 is provided with a fourth through hole at the position protruding from the surface of the Stirling refrigerator, the opening and closing cylinder 4 is provided with a fifth through hole at the corresponding position, and the pulling shaft 7 is provided with a sixth through hole at the corresponding position for inserting the insertion pin 3, wherein the fifth through hole, the sixth through hole and the insertion pin 3 are matched in size. In some embodiments, the length of the insertion pin 3 is not longer than the diameter of the first through hole and not shorter than the diameter of the pulling shaft 7. By such a design, the opening and closing cylinder 4 is driven by the pulling shaft 7, so that the opening and closing cylinder 4 is taken out together with the bearing outer ring 5. Figures 1-3 In some embodiments, the second through hole of the support table 2 and the force-applying gland 6 are threadedly matched. For example, the force-applying gland 6 and the support table 2 are respectively provided with external and internal threads, the force-applying gland is rotated downward by the external thread to provide initial pressure, and the wedge-shaped surface contact pushes the wedge-shaped pin to move horizontally to realize two-stage amplification of the taking-out force. The pressure is not limited to the screw tightening force, but can also come from other devices or mechanisms that can provide initial pressure and have wedge-shaped extrusion structures.

[0040] In some embodiments, the angle of the wedge-shaped surface of the wedge-shaped pin 1 and the wedge-shaped surface of the force-applying gland 6 is 8°-20°. As an example, when the angles of the two-stage wedge-shaped structure are both 10°, as shown in

[0041] Figure 4 After two-stage amplification, the screw tightening force is amplified by 32.3 times (1 / tan10°)2. Of course, each wedge angle is not limited to 10°, and the wedge-shaped pin can be matched with the guide groove.

[0042] A use process of the Stirling refrigerator crankcase blind hole bearing outer ring taking-out assembly of the embodiments is as follows:

[0043] S1 first put the opening and closing cylinder into the blind hole bottom surface.

[0044] S2 insert the horizontal wedge-shaped slot into the pulling shaft square slot, and insert them together into the support table.

[0045] S3 insert the combined structure in S2 into the middle of the opening and closing cylinder (the opening and closing cylinder is expanded) through the pulling shaft until the blind hole bottom surface.

[0046] S4 insert the insertion pin through the horizontal hole in the middle of the support table, through the opening and closing cylinder and the pulling shaft, and tighten it.​

[0047] S5 screw into wedge-shaped force cover, use tools or bare-handed further downward into the force cover, until the pull shaft rises, through the wedge-shaped force cover.

[0048] S6 at this time, the bearing outer ring is pulled out, the hand-held support table takes out the bearing outer ring taking-out structure together with the bearing outer ring.

[0049] The Stirling cryogenic machine crankcase blind hole bearing outer ring taking-out assembly provided by the embodiments of the application meets the requirement of taking out the Stirling cryogenic machine crankcase bearing, and provides a pulling force greater than the ordinary screwing force. The wedge-shaped secondary amplification structure is adopted, the overall structure space size is saved, a better support and a larger contact area are provided than the existing beam vertical rod structure, and the surface quality of the crankcase part is effectively protected. The bearing outer ring taking-out method and structure realized by the taking-out assembly are successfully applied to the Stirling cryogenic machine, and engineering application is realized.

[0050] It should be noted that in the embodiments of the application, the terms "comprising", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0051] The serial numbers of the embodiments of the application described above are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0052] The embodiments of the application are described above in combination with the drawings, but the application is not limited to the above specific embodiments, the above specific embodiments are only illustrative, but not restrictive, and those skilled in the art can make many forms under the inspiration of the application without departing from the purpose of the application and the scope protected by the claims, which all belong to the protection of the application.

Claims

1. A component for removing the outer ring of a blind bore bearing in the crankcase of a Stirling refrigeration unit, characterized in that, include: The opening and closing cylinder (4) is a tubular structure with an inner diameter slightly smaller than the diameter of the pull shaft (7) and an outer diameter slightly smaller than the diameter of the blind hole of the Stirling refrigerator. The side edge that contacts the blind hole of the Stirling refrigerator is provided with a protruding structure. After the pull shaft (7) is inserted, the specifications of the opening and closing cylinder (4) match the blind hole of the Stirling refrigerator. A pull shaft (7) has one end that can be inserted into the opening and closing cylinder (4), and the other end is provided with a wedge groove, which is used to set a wedge pin (1). wedge pin (1); The pressure cap (6) has a wedge-shaped surface inside that is adapted to the side wall of the wedge pin (1); The support platform (2) has a stepped structure on its outer wall that is adapted to the upper edge of the blind hole of the Stirling refrigerator. It has a first through hole and a second through hole that are connected. The diameter of the first through hole is such that the opening and closing cylinder (4) can be inserted, and the diameter of the second through hole is such that the pressure cover (6) can be installed. The support platform (2) has a fourth through hole protruding from the Stirling refrigerator platform, the opening and closing cylinder (4) has a fifth through hole at the corresponding position, and the pull shaft (7) has a sixth through hole at the corresponding position, for inserting the insertion pin (3). The second through hole of the support platform (2) and the pressure cap (6) are threaded together.

2. The Stirling refrigeration unit crankcase blind bore bearing outer ring removal assembly as described in claim 1, characterized in that, The wedge groove has a plane and opposing inclined surfaces, the plane being perpendicular to the axial direction of the pull shaft (7), and the wedge pin (1) being a horizontal wedge member adapted to the wedge groove.

3. The Stirling refrigeration engine crankcase blind bore bearing outer ring removal assembly as described in claim 1, characterized in that, The pressure cap (6) has a third through hole at one end away from the pull shaft (7), and the specifications of the third through hole are such that the other end of the pull shaft (7) can be dislodged.

4. The Stirling refrigeration unit crankcase blind bore bearing outer ring removal assembly as described in claim 1, characterized in that, The fifth through hole and the sixth through hole are compatible with the specifications of the insertion pin (3).

5. The Stirling refrigeration unit crankcase blind bore bearing outer ring removal assembly as described in claim 4, characterized in that, The length of the insertion pin (3) is not longer than the diameter of the first through hole.

6. The Stirling refrigeration engine crankcase blind bore bearing outer ring removal assembly as described in claim 1, characterized in that, The wedge-shaped surface of the wedge pin (1) and the angle of the wedge-shaped surface of the force-applying cap (6) are 8°-20°.

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