Stainless steel stop valve element structure and machining method thereof

Abstract

The invention relates to a stainless steel stop valve element for an air conditioner and a manufacturing method thereof, a stop valve comprises a valve body and a valve element, the valve element is made of stainless steel and is in threaded connection with the valve body, and sealing is achieved through a sealing ring; a matching hole, a tool withdrawal groove and a cylindrical hole are formed in the valve element, the tool withdrawal groove is used for removing and storing burrs when the matching hole is machined, the external control piece is connected with the matching hole in a matched mode, control over vertical movement of the valve element in the valve body is achieved by rotating the external control piece, and the stop valve is closed when the valve element moves to the bottom conical surface and is pressed against the inner wall of a water inlet of the valve body. By utilizing the technical scheme provided by the invention, the problem of burr accumulation during processing of the stainless steel workpiece is solved; through the arrangement of the tool withdrawal groove in the middle of the matching hole, burrs generated when the inner hole is punched are directly stripped and removed and enter the tool withdrawal groove to be stored, so that the surface quality of the matching hole is guaranteed, machining steps are reduced, and the production efficiency and the assembly precision are improved.

Description

Technical Field

[0001] The invention relates to the technical field of air-conditioning valves, and in particular to a stainless steel stop valve core. Background Art

[0002] The existing air conditioning stop valve consists of a valve core and a valve body. The valve core is installed on the valve body through threads on the outside. A hexagonal matching hole is provided inside the valve core. A hexagonal wrench is inserted into the matching hole and rotated to move the valve core up and down in the valve body. When the bottom chamfer of the valve core moves down to press against the inner wall of the water inlet, the stop valve is closed. Common valve cores are mostly made of brass, which is easy to oxidize and rust, has low hardness and is easy to deform and damage, and is relatively expensive.

[0003] The above problems can be effectively solved by switching to stainless steel. However, stainless steel has poorer machinability than brass. When stamping the hexagonal matching hole of the valve core, burrs are easily accumulated at the bottom of the hole. In addition, due to the high strength and plasticity of stainless steel, conventional processing technology cannot completely remove the burrs at the bottom of the inner hole, thus affecting the finished product quality of the valve core and the assembly accuracy of external operating tools. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a stainless steel stop valve core, the specific structure of which is as follows: A stainless steel stop valve core, the outer circumferential surface of the valve core is provided with an upper retaining ring, a lower retaining ring, a thread and a sealing cone surface in sequence from top to bottom, the upper retaining ring and the lower retaining ring are used to fix the sealing ring, and the sealing ring realizes the sealing between the valve core and the valve body by contacting with the stop valve body; a stepped hole is provided inside the valve core, the upper part of the stepped hole is a matching hole, the inscribed circle diameter of the matching hole is A, the circumscribed circle diameter is B, the matching hole is matched and connected with an external control part, and the valve core is driven to move up and down relative to the valve body by rotating the external control part, and the stop valve is closed when the sealing cone surface is pressed against the inner wall of the valve body entering water; a back-knife groove is provided in the middle of the stepped hole, the back-knife groove diameter is G, the bottom of the stepped hole is a cylindrical hole, and the cylindrical hole diameter is C; the back-knife groove and the matching hole are coaxial, G≥B, and the cylindrical hole and the matching hole are coaxial, C≤A.

[0005] The above-mentioned tool withdrawal groove structural setting plays a role in removing and storing debris generated during processing, avoiding the accumulation of burrs generated when punching the inner hole, and improving processing efficiency and product surface quality.

[0006] Furthermore, the minor diameter of the thread is K, K-0.5mm≥G, that is, the minimum wall thickness at the back-cut groove is greater than 0.5mm, so as to ensure the overall strength of the valve core.

[0007] Furthermore, when the matching hole is a regular hexagon, the undercut groove and the matching hole satisfy the following formula:

[0008] Among them, E is the width of the undercut groove, and D is the depth of the matching hole, which is used to ensure that the volume of the undercut groove is larger than the volume of all debris generated during stamping.

[0009] Furthermore, the distance from the bottom of the undercut groove to the bottom of the cylindrical hole is F, where F>0 mm, so as to avoid damage caused by the tool hitting the bottom of the cylindrical hole when machining the undercut groove.

[0010] Furthermore, a guide chamfer is provided at the connection between the matching hole and the end surface of the valve core opening side. The guide chamfer is coaxial with the valve core and is used for guiding positioning when machining the inner hole and clamping positioning when machining the outer peripheral surface.

[0011] Furthermore, an inverted cone surface is provided at the bottom of the cylindrical hole.

[0012] Furthermore, a positioning cone angle is provided at the bottom of the valve core, which cooperates with the guide chamfer and is used for clamping and positioning when processing the outer peripheral surface; it can be understood that the positioning cone angle at the bottom of the valve core can reduce the bottom surface stiffness, thereby making it easier for the bottom surface chamfer to produce elastic deformation when squeezed with the valve body water inlet pipe wall, thereby reducing the clamping force required to achieve the closure of the stop valve and extending the service life of the stop valve.

[0013] The present invention also provides a processing method for a stainless steel stop valve core, which is used to manufacture the above-mentioned stainless steel stop valve core, and the processing method includes: S1: clamping and fixing the stainless steel bar stock, and turning a cylindrical outer peripheral surface and a top end surface; S2: pre-processing a guide chamfer at the center of the end surface of one end of the bar stock by a drilling process, and then drilling a cylindrical hole; S3: processing a back-off groove in the middle of the cylindrical hole by a boring process; S4: processing a hexagonal matching hole by a stamping process, and the punch exceeds the upper edge of the back-off groove but does not exceed the lower edge of the back-off groove during the stamping process. The punch is squeezed so that the waste is separated from the workpiece after exceeding the upper edge of the back-off groove and enters the back-off groove and the cylindrical hole; S5: turning a thread, an upper retaining ring and a lower retaining ring on the outer peripheral surface; S6: separating the workpiece from the bar stock by turning and cutting to complete the processing.

[0014] Through the above processing method, the bar material is machined first and then cut to achieve the one-piece processing and forming of the valve core, which can better control the cutting error, avoid the stress caused by cutting during the processing, and avoid the burr accumulation phenomenon caused by stainless steel material during processing, thereby improving the processing efficiency.

[0015] The present invention also provides a processing method for a stainless steel stop valve core, which is used to manufacture the above-mentioned stainless steel stop valve core, and the processing method includes: S1: clamping and fixing the stainless steel bar material, and machining a cylindrical outer peripheral surface by turning; S2: separating the workpiece from the bar material by turning and cutting; S3: machining a centering cone angle at the center of the bottom surface of the workpiece by a drilling process; S4: clamping and fixing the workpiece, pre-machining a guide chamfer at the center of the top surface of the workpiece by a drilling process, and then drilling a cylindrical hole; S5: machining a back-off groove in the middle of the cylindrical hole by a boring process; S6: machining an inner hexagonal matching hole by a stamping process, the punch exceeds the upper edge of the back-off groove but does not exceed the lower edge of the back-off groove during the stamping process, and the waste material is separated from the workpiece after exceeding the upper edge of the back-off groove through the punch extrusion, and enters the back-off groove and the cylindrical hole; S7: fixing the two ends of the workpiece by a center, machining threads, an upper retaining ring and a lower retaining ring on the outer peripheral surface of the workpiece by a turning process, and completing the processing.

[0016] Through the above processing method, the bar is first cut into short bars and then processed, which reduces the processing stress and the vibration generated by the rotating bar, helps to improve the surface processing quality, and solves the problem that conventional processing technology cannot completely remove the burrs of stainless steel workpieces; and by processing the inner hole first and then the outer peripheral surface, the outer peripheral surface is avoided from being worn in the previous processing steps, thereby ensuring the processing accuracy of the outer peripheral surface.

[0017] Furthermore, after the cylindrical hole is processed by the drilling process, the bottom of the cylindrical hole is processed into a plane by a milling process.

[0018] Through the above technical solution, the burr accumulation phenomenon generated when processing stainless steel workpieces is solved. The burrs generated when stamping the inner hole are squeezed into the backing groove or directly peeled off and removed, thereby ensuring the surface quality of the matching hole, reducing the processing steps, and improving production efficiency and assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a stainless steel stop valve core provided by the present invention.

[0020] Figure 2 A cross-sectional view of a stainless steel stop valve core provided by the present invention.

[0021] Figure 3 This is a structural schematic diagram of the air conditioning stop valve provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the closed state of the air conditioning stop valve provided by the present invention.

[0023] Figure 5 This is a schematic diagram of the dimensions of the stainless steel stop valve core provided by the present invention.

[0024] Figure 6A schematic diagram of the dimensions of a stainless steel stop valve core from a top view provided by the present invention.

[0025] Figure 7 A schematic diagram of a method for processing a stainless steel stop valve core provided by the present invention.

[0026] Figure 8 A schematic diagram of another method for processing a stainless steel stop valve core provided by the present invention.

[0027] Among them, 1-valve core; 2-upper retaining ring; 3-lower retaining ring; 4-thread; 5-sealing ring; 6-stop valve body; 7-step hole; 8-matching hole; 9-back-off groove; 10-cylindrical hole; 11-guide chamfer; 12-inverted cone surface; 13-positioning cone angle; 14-sealing cone surface; A-inscribed circle diameter of matching hole; B-circle diameter of matching hole; C-cylindrical hole diameter; D-matching hole depth; E-back-off groove width; F-distance from the bottom of the back-off groove to the bottom of the cylindrical hole; G-back-off groove diameter; H-step hole depth; K-valve core outer diameter. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 6 As shown, an embodiment of the present invention provides a stainless steel stop valve core, the outer circumferential surface of the valve core 1 is provided with an upper retaining ring 2, a lower retaining ring 3, a thread 4 and a sealing cone 14 in sequence from top to bottom, the upper retaining ring 2 and the lower retaining ring 3 are used to fix the sealing ring 5, the valve core 1 and the stop valve body 6 are moved up and down by threaded cooperation, the sealing ring 5 can be made of rubber material, and the sealing of the valve core 1 and the valve body 6 is achieved by squeezing the contact surface of the valve core 1 and the stop valve body 6; a stepped hole 7 is opened inside the valve core 1, the upper part of the stepped hole 7 is a matching hole 8, the inscribed circle diameter of the matching hole 8 is A, and the circumscribed circle diameter of the matching hole 8 is B, the matching hole 8 is connected with the external control part, and is used to drive the valve core 1 to rotate relative to the valve body 6, and a sealing cone 14 is provided at the bottom of the valve core 1, as shown in FIG. Figure 4 As shown, the stop valve is closed when the valve core 1 is rotated to press the sealing cone 14 against the water inlet pipe wall of the valve body 6. The chamfer angle of the sealing cone 14 is preferably 45°. At this time, the pressing force required for closing is minimal, and the sealing cone 14 can be rounded. A backlash groove 9 is provided in the middle of the stepped hole 7, and the backlash groove diameter is G. The bottom of the stepped hole 7 is a cylindrical hole 10, and the cylindrical hole diameter is C. The backlash groove 9 is coaxial with the matching hole 8, G≥B, and the cylindrical hole 10 is coaxial with the matching hole 8, C≤A.

[0030] Through the structural setting of the above-mentioned back-knife groove and stepped hole, since the diameter of the back-knife groove is larger than the circumscribed circle diameter of the matching hole, it is ensured that all the debris generated during the punching of the hexagonal hole enters the back-knife groove; and the external control part will not interfere with the back-knife groove when connected to the valve core.

[0031] Specifically, the minor diameter of the thread 3 is K, K-0.5mm≥G, that is, the minimum wall thickness at the back-cut groove is greater than 0.5mm, so as to ensure the overall strength of the valve core.

[0032] Specifically, the matching hole 8 can be set to a regular quadrilateral, a regular hexagon or a regular octagon structure, so that each surface of the matching hole is evenly stressed when connected to an external control component.

[0033] Specifically, when the matching hole 8 is a regular hexagon, the undercut groove 9 and the matching hole 8 satisfy the following formula:

[0034] Wherein, E is the width of the undercut groove 9, and D is the depth of the matching hole 8, which are used to ensure that the volume of the undercut groove is larger than the volume of all debris generated during stamping.

[0035] Specifically, the distance from the bottom of the undercut groove 9 to the bottom of the cylindrical hole 10 is F, and F>0 mm, so as to avoid the tool hitting the bottom of the cylindrical hole and causing damage when machining the undercut groove.

[0036] Specifically, a guide chamfer 11 is provided at the connection between the matching hole 8 and the end face of the opening side of the valve core 1. The guide chamfer 11 is coaxial with the valve core 1. The degree of the guide chamfer 11 can be 30°, 45°, 60°, etc., and is used for guiding positioning when processing the inner hole and clamping positioning when processing the outer peripheral surface.

[0037] Specifically, an inverted cone surface 12 is provided at the bottom of the cylindrical hole 10, and the inverted cone surface 12 is formed simultaneously when the drill bit is drilling the inner cylindrical hole.

[0038] Specifically, a positioning cone angle 13 is provided at the bottom of the valve core 1, and the degree of the positioning cone angle 13 can be 30°, 45°, 60°, etc., which is coaxial with the guide chamfer 11 and is used for clamping and positioning when processing the outer peripheral surface; it can be understood that the positioning cone angle 13 at the bottom of the valve core 1 can reduce the bottom surface stiffness, so that the bottom surface chamfer 14 is more likely to produce elastic deformation when squeezed with the water inlet pipe wall of the valve body 6, thereby reducing the clamping force required to close the stop valve and extending the service life of the stop valve.

[0039] like Figure 7As shown, a processing method for a stainless steel stop valve core is used to manufacture the stainless steel stop valve core described in the present invention, and the processing method comprises: S1: clamping and fixing the stainless steel bar stock, and turning a cylindrical outer peripheral surface and a top end surface; S2: pre-processing a guide chamfer 11 at the center of the end surface of one end of the bar stock by a drilling process, and then drilling a cylindrical hole 10; S3: processing a back-off groove 9 in the middle of the cylindrical hole 10 by a boring process; S4: processing a hexagonal matching hole 8 by a stamping process, and the punch exceeds the upper edge of the back-off groove 9 but does not exceed the lower edge of the back-off groove 9 during the stamping process. The waste material is separated from the workpiece after exceeding the upper edge of the back-off groove 9 through the punch extrusion, and enters the back-off groove 9 and the cylindrical hole 10; S5: turning a thread 4, an upper retaining ring 2, a lower retaining ring 3 and a sealing cone surface 14 on the outer peripheral surface; S6: separating the workpiece from the bar stock by turning and cutting to complete the processing.

[0040] Through the above processing method, the bar material is machined first and then cut to achieve the one-piece processing and forming of the valve core, which can better control the cutting error, avoid the stress caused by cutting during the processing, and avoid the accumulation of burrs generated by stainless steel materials during processing, and remove the burrs in an additional processing step, so as to improve the processing efficiency.

[0041] like Figure 8 As shown, a processing method for a stainless steel stop valve core is used to manufacture the stainless steel stop valve core of the present invention, and the processing method comprises: S1: clamping and fixing the stainless steel bar material, and machining a cylindrical outer peripheral surface by turning; S2: separating the workpiece from the bar material by turning and cutting; S3: machining a centering taper angle 13 at the center of the bottom surface of the workpiece by a drilling process; S4: clamping and fixing the workpiece, pre-machining a guide chamfer 11 at the center of the top surface of the workpiece by a drilling process, and then drilling a cylindrical hole 10; S5: a back-off groove 9 is machined in the middle of the cylindrical hole 10 by a boring process; S6: a hexagonal socket fitting hole is machined by a stamping process, and the punch exceeds the upper edge of the back-off groove 9 but does not exceed the lower edge of the back-off groove 9 during the stamping process. The waste material is separated from the workpiece after exceeding the upper edge of the back-off groove 9 through the extrusion of the punch, and enters the back-off groove 9 and the cylindrical hole 10; S7: the two ends of the workpiece are fixed by a center, and a thread 4, an upper retaining ring 2, a lower retaining ring 3 and a sealing cone surface 14 are machined on the outer peripheral surface of the workpiece by a turning process to complete the processing.

[0042] Through the above processing method, the bar is first cut into short bars and then processed, which reduces the processing stress and the vibration generated by the rotating bar, helps to improve the surface processing quality, solves the problem that conventional processing technology cannot completely remove the burrs of stainless steel workpieces, and improves the processing quality of the inner hole of the workpiece; and by processing the inner hole first and then the outer peripheral surface, the outer peripheral surface is avoided from being worn in the previous processing steps, thereby ensuring the processing accuracy of the outer peripheral surface.

[0043] Specifically, after the cylindrical hole 10 is processed by the drilling process, the inverted cone surface 12 at the bottom of the cylindrical hole 10 is processed into a plane by the milling process, so as to conveniently accommodate the extra-long portion of the longer external control component after being inserted into the matching hole.

[0044] Those skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stainless steel stop valve core, wherein the outer peripheral surface of the valve core (1) is provided with an upper retaining ring (2), a lower retaining ring (3), a thread (4) and a sealing cone surface (14) in sequence from top to bottom, wherein the upper retaining ring (2) and the lower retaining ring (3) are used to fix the sealing ring (5), and the sealing ring (5) achieves sealing between the valve core (1) and the valve body (6) by contacting with the stop valve body (6); a stepped hole (7) is provided inside the valve core (1), and the upper part of the stepped hole (7) is a matching hole (8), the matching hole (8) has an inscribed circle diameter A and an circumscribed circle diameter B, and the matching hole (8) is connected with an external control member and is used to drive the valve core (1) to move up and down relative to the valve body (6), and when the valve core (1) moves down to the point where the sealing cone surface (14) is pressed against the inner wall of the water inlet of the valve body (6), the stop valve is closed; It is characterized in that A tool-retracting groove (9) is provided in the middle of the stepped hole (7), the diameter of the tool-retracting groove is G, the bottom of the stepped hole (7) is a cylindrical hole (10), the diameter of the cylindrical hole is C; the tool-retracting groove (9) and the matching hole (8) are coaxial, G≥B, and the cylindrical hole (10) and the matching hole (8) are coaxial, C≤A.

2. The stainless steel valve core according to claim 1, characterized in that: The minor diameter of the thread (3) is K, K-0.5mm≥G.

3. The stainless steel stop valve core according to claim 1, characterized in that: The undercut groove (9) and the matching hole (8) satisfy the following formula: ； Wherein, E is the width of the back cut groove (9), and D is the depth of the matching hole (8).

4. The stainless steel stop valve core according to claim 1, characterized in that: The distance from the bottom of the back cut groove (9) to the bottom of the cylindrical hole (10) is F, where F>0 mm.

5. The stainless steel stop valve core according to claim 1, characterized in that: A guide chamfer (11) is provided at the connection between the matching hole (8) and the end surface of the opening side of the valve core (1), and the guide chamfer (11) is coaxial with the valve core (1).

6. The stainless steel stop valve core according to claim 1, characterized in that: An inverted cone surface (12) is provided at the bottom of the cylindrical hole (10).

7. The stainless steel stop valve core according to claim 1, characterized in that: A positioning cone angle (13) is provided at the bottom of the valve core (1); the positioning cone angle (13) is coaxial with the valve core (1); and the positioning cone angle (13) cooperates with a clamping tool to achieve positioning.

8. A method for processing a stainless steel stop valve core, the method being used to manufacture the stainless steel stop valve core according to any one of claims 1 to 7, characterized in that: The processing method comprises: S1: The stainless steel bar is clamped and fixed, and a cylindrical outer peripheral surface and a top end surface are machined by turning; S2: Pre-processing a guide chamfer (11) at the center of the end face of one end of the bar by drilling, and then drilling a cylindrical hole (10); S3: machining a backhoe groove (9) in the middle of the cylindrical hole (10) by a boring process; S4: a hexagon socket matching hole (8) is formed by a stamping process, wherein the punch exceeds the upper edge of the undercut groove (9) but does not exceed the lower edge of the undercut groove (9) during the stamping process, and the waste material generated by the cylindrical hole (10) is separated from the workpiece after exceeding the upper edge of the undercut groove (9) and enters the undercut groove (9) through the punch extrusion; S5: turning the outer peripheral surface to form a thread (4), an upper retaining ring (2), a lower retaining ring (3) and a sealing cone surface (14); S6: The workpiece is separated from the bar through turning and cutting to complete the processing.

9. A method for processing a stainless steel stop valve core, the method being used to manufacture the stainless steel stop valve core according to any one of claims 1 to 7, characterized in that: The processing method comprises: S1: The stainless steel bar is clamped and fixed, and a cylindrical outer surface is machined by turning; S2: Separate the workpiece from the bar by turning and cutting; S3: machining a centering taper angle (13) at the center of the bottom surface of the workpiece by drilling; S4: The workpiece is clamped and fixed, a guide chamfer (11) is pre-machined at the center of the top surface of the workpiece by a drilling process, and then a cylindrical hole (10) is drilled; S5: machining a backhoe groove (9) in the middle of the cylindrical hole (10) by a boring process; S6: a hexagon socket matching hole is formed by a stamping process, wherein the punch exceeds the upper edge of the undercut groove (9) but does not exceed the lower edge of the undercut groove (9) during the stamping process, and the waste material is separated from the workpiece after exceeding the upper edge of the undercut groove (9) through the punch extrusion, and enters the undercut groove (9) and the cylindrical hole (10); S7: Fix both ends of the workpiece by a center, and process threads (4), an upper retaining ring (2), a lower retaining ring (3) and a sealing cone surface (14) on the outer peripheral surface of the workpiece by a turning process to complete the processing.

10. The method for processing a stainless steel stop valve core according to claim 8 or 9, characterized in that: After the cylindrical hole (10) is machined by the drilling process, the inverted cone surface (12) at the bottom of the cylindrical hole (10) is machined into a plane by a milling process.

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