Copper alloy sleeve for high pressure air valve

Abstract

The present application discloses a copper alloy copper sleeve for a high-pressure air valve, which belongs to the field of high-pressure air valve ventilation engineering. It includes: a first outer cylinder and a second outer cylinder, the first outer cylinder and the second outer cylinder are an integrally formed structure, an inner circular hole is provided inside the first outer cylinder, a square hole connected to the inner circular hole is provided on the second outer cylinder, when the cross section of the square hole coincides with the cross section of the inner circular hole, the cross section of the square hole is located within the cross section of the inner circular hole; a convex ring portion is provided on the inner wall of the inner circular hole, a notch is provided on the convex ring portion, and the cross section of the notch coincides with part of the cross section of the square hole; the first outer cylinder, the second outer cylinder, the inner circular hole and the square hole are coaxially arranged. The beneficial effect of the present application is to provide a copper alloy copper sleeve for a high-pressure air valve with high concentricity between the inner square hole and the outer circle.

Description

Technical Field

[0001] The present application relates to the field of high-pressure air valve ventilation engineering, and in particular, to a copper alloy copper sleeve for a high-pressure air valve. Background Art

[0002] At present, according to the development of domestic infrastructure projects such as subway tunnels and public facilities, ventilation systems are becoming more and more complex, and the pressure of pipe network systems is getting higher and higher. In the field of subway and tunnel ventilation, the speed of various vehicles is getting faster and faster, which brings more and more piston wind. The demand for air valves in piston air ducts is increasing, and the sealing requirements are also getting higher and higher. This requires that the air valves of our ventilation system need to maintain their own sealing performance under high pressure.

[0003] The high-pressure damper of the ventilation system is composed of multiple blades, and two bearings are installed on the main shaft of each blade to bear the weight of the blade while maintaining flexible rotation performance. They are hung in the opening of the damper frame, and the outer circle of the bearing is embedded in the opening of the valve frame so that it can rotate flexibly. When used for high-pressure closed dampers, in order to increase the accuracy of transmission and the sealing of the damper, a copper alloy sleeve with a square outer circle and inner square main shaft is used as a bearing. When the copper alloy bearings of this type of damper are mass-produced, a square long hole is first pulled out in the middle of a cylindrical copper rod, and then processed in sections. Since the inner hole has been formed after segmented processing, the inner hole of the single copper sleeve is formed by processing the entire copper rod. Compared with the outer circle of the single copper sleeve, there is a high probability of eccentricity. The eccentricity of the inner hole of the copper sleeve will cause the main shaft installed on the same blade to be non-concentric, thereby causing the risk of blade twisting, jamming, and deformation and damage of the sleeve.

[0004] This requires an outer circle and inner square copper alloy bearing structure with high concentricity between the inner square hole and the outer circle and suitable for batch processing, to replace the original bearing structure for high-pressure closed air valves. Utility Model Content

[0005] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0006] In order to solve the technical problems mentioned in the above background technology part, some embodiments of the present application provide a copper alloy copper sleeve for a high-pressure air valve, including: a first outer cylinder and a second outer cylinder, the first outer cylinder and the second outer cylinder are an integrally formed structure, an inner circular hole is opened through the inside of the first outer cylinder, and a square hole connected to the inner circular hole is opened on the second outer cylinder, when the cross-section of the square hole coincides with the cross-section of the inner circular hole, the cross-section of the square hole is located within the cross-section of the inner circular hole; a convex ring portion is provided on the inner wall of the inner circular hole, and a notch is opened on the convex ring portion, and the cross-section of the notch coincides with part of the cross-section of the square hole; the first outer cylinder, the second outer cylinder, the inner circular hole and the square hole are coaxially arranged.

[0007] Furthermore, both ends of the convex ring portion have guide surfaces.

[0008] Furthermore, the cross section of the guide surface gradually decreases from one end to the other end.

[0009] Furthermore, the diameter of the second outer cylinder is greater than the diameter of the first outer cylinder.

[0010] Furthermore, the edges and corners of the notch and the square hole are arc-shaped.

[0011] The beneficial effects of the present application are: high sealing is achieved under the premise of ensuring accurate transmission of the air valve blades, while having quality assurance of high concentricity between the internal square hole and the outer circle, and being suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0013] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0014] In the attached picture:

[0015] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0016] Figure 2 is a front view according to an embodiment of the present application;

[0017] Figure 3 is a cross-sectional view according to an embodiment of the present application.

[0018] Reference numerals:

[0019] 1. First outer cylinder; 2. Second outer cylinder; 3. Inner circular hole; 4. Square hole; 5. Protruding ring; 6. Notch. DETAILED DESCRIPTION

[0020] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0021] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0022] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0023] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0024] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0025] Reference Figure 1-3 , a copper alloy copper sleeve for a high-pressure air valve comprises a first outer cylinder 1 and a second outer cylinder 2; the first outer cylinder 1 and the second outer cylinder 2 are integrally formed structures. An inner circular hole 3 is formed through the first outer cylinder 1, and a square hole 4 connected to the inner circular hole 3 is formed on the second outer cylinder 2. When the cross section of the square hole 4 coincides with the cross section of the inner circular hole 3, the cross section of the square hole 4 is located within the cross section of the inner circular hole 3; a convex ring portion 5 is provided on the inner wall of the inner circular hole 3, and a notch 6 is formed on the convex ring portion 5, and the cross section of the notch 6 coincides with part of the cross section of the square hole 4. Among them, the first outer cylinder 1, the second outer cylinder 2, the inner circular hole 3 and the square hole 4 are coaxially arranged.

[0026] The edges and corners of the notch 6 and the square hole 4 are arc-shaped.

[0027] Both ends of the convex ring portion 5 have guide surfaces, and the cross-section of the guide surface gradually decreases from one end to the other end.

[0028] The diameter of the second outer cylinder 2 is greater than the diameter of the first outer cylinder 1 .

[0029] The convex ring portion 5 and the inner circular hole 3 are an integrally formed structure.

[0030] The present application also provides a method for preparing a copper alloy copper sleeve for a high-pressure air valve, the steps of the preparation method comprising:

[0031] a. Select the blank;

[0032] b. Turning the blank to prepare the outer circle;

[0033] c. Turning the blank prepared in step b again to prepare an inner circular hole;

[0034] d. In step c, the inner wall of one end of the blank is chamfered by using a backing car to form a convex ring on the inner wall of one end of the blank;

[0035] e. The blank prepared in step d is subjected to a stamping die to form square holes having through holes at both ends of the blank;

[0036] f. Fine grinding;

[0037] g. Complete the copper sleeve preparation.

[0038] Among them, in step a, the present application selected a copper rod with a diameter of 22 mm and a length of 10 mm.

[0039] In step b, a positioning vehicle with a diameter of 22 mm is used to process the outer contour of the copper rod to form the outer circle of the copper sleeve, and the outer circle has a diameter of 19.92 mm and a length of 8 mm.

[0040] In step c, the copper rod is processed again by the same positioning vehicle as in step b to form an inner circular hole 3 of the copper sleeve, wherein the inner circular hole 3 has a diameter of 15.2 mm and a length of 8 mm.

[0041] In step d, before chamfering, the inner circular hole 3 is processed again, and the inner circular hole 3 is prepared to have a diameter of 16.5 mm and a length of 5.8 mm; the remaining length 2.2 mm of the inner circular hole 3 is chamfered, and the chamfering angle is 45°, so as to form a convex ring with a diameter of 15.2 mm and a width of 0.5 mm.

[0042] In step e, at the same location, punching is performed from the opening of the inner circular hole 3 to penetrate the entire copper rod, and the punching die shape is a 12.15*12.15mm square rounded hole.

[0043] Through the above-mentioned preparation method, the present application first processes the outer circle of the copper sleeve, replacing the process of processing the outer circle at the end of the original outer circle inner square copper sleeve; the processed outer circle is used as the reference for processing the internal structure of the copper sleeve. At the same time, the inner circle hole 3 of the copper sleeve replaces the original rectangular inner wall inside the copper sleeve, avoiding the difficulty of processing the rectangular inner wall, so that the copper sleeve inner wall processing process can be realized. And the inner square hole 4 at both ends of the copper sleeve forms a mating surface with the main shaft instead of the original rectangular mating surface with the main shaft inside the copper sleeve, avoiding the eccentricity caused by first processing the inner square hole 4 of the copper sleeve and then processing the outer circle, realizing the processing of the inner square holes 4 at both ends of the copper sleeve based on the outer circle of the copper sleeve, greatly improving the concentricity of the structure of the inner square hole 4 of the copper sleeve and the outer circle.

[0044] The preparation method of the present application realizes the matching function of the original rectangular inner wall structure inside the copper sleeve and the main shaft through two easy-to-process structures, namely the inner circular hole 3 of the copper sleeve and the inner square holes 4 at both ends of the copper sleeve; changes the processing procedure of the copper alloy bearing, realizes the outer circle is processed first so that the inner processing of the copper sleeve can use the outer circle as a reference, which greatly improves the relative tolerance level of the copper alloy bearing; by connecting the processing of the outer circle of the copper sleeve and the internal structure of the copper sleeve, the original processing state of each is changed, the phenomenon of eccentricity of the inner hole is avoided, the original rectangular inner wall structure of the copper alloy bearing is abandoned, and the difficulty of processing the rectangular inside the copper alloy bearing is avoided; thereby achieving high pressure bearing and high sealing performance while ensuring the accurate transmission of the air valve blades, while having the quality assurance of high concentricity between the inner square hole 4 and the outer circle, and being suitable for mass production.

[0045] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A copper alloy copper sleeve for a high pressure air valve, characterized in that :include: A first outer cylinder and a second outer cylinder, wherein the first outer cylinder and the second outer cylinder are an integrally formed structure, an inner circular hole is formed through the first outer cylinder, and a square hole connected to the inner circular hole is formed on the second outer cylinder, and when the cross section of the square hole coincides with the cross section of the inner circular hole, the cross section of the square hole is located within the cross section of the inner circular hole; a convex ring portion is provided on the inner wall of the inner circular hole, and a notch is formed on the convex ring portion, and the cross section of the notch coincides with a part of the cross section of the square hole; the first outer cylinder, the second outer cylinder, the inner circular hole and the square hole are coaxially arranged.

2. The copper alloy copper sleeve for high pressure air valve according to claim 1 is characterized in that: Both ends of the convex ring portion have guide surfaces.

3. The copper alloy copper sleeve for high pressure air valve according to claim 2 is characterized in that: The cross section of the guide surface gradually decreases from one end to the other end.

4. The copper alloy copper sleeve for high pressure air valve according to claim 1 is characterized in that: The diameter of the second outer cylinder is greater than the diameter of the first outer cylinder.

5. The copper alloy copper sleeve for high pressure air valve according to claim 1 is characterized in that: The edges and corners of the notch and the square hole are arranged in an arc shape.

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