Press fitting clamp for sealing surface of valve core

Abstract

The invention provides a valve core sealing surface press fitting clamp which comprises an adjusting assembly, a guide protection assembly and a press fitting structure, the adjusting assembly comprises a cushion block and an adjusting block, the cushion block serves as a base of the whole clamp, the bottom surface of the cushion block is a plane, a threaded hole is machined in the center of the plane, the lower portion of the adjusting block is a threaded column used for being in threaded connection with the cushion block, and the upper portion of the adjusting block is of a circular ring structure; the guide protection assembly comprises a guide cylinder and a protection pad, the guide cylinder is connected to the periphery of a circular ring of the adjusting block in a sleeving mode, the protection pad is placed on the top face of the circular ring of the adjusting block, the valve element assembly is placed in the guide cylinder, the bottom face of the valve element assembly makes contact with the protection pad, and the press-fitting structure is a press-fitting block which is of a circular groove structure and inversely buckled to the periphery of the guide cylinder. A profiling taper hole is machined in the center of the groove bottom face of the press-fitting block, and the opening end of the profiling taper hole corresponds to the closing-up position of the top of the framework of the valve element assembly. The structure is compact, it can be ensured that the closing-up position on the framework completely wraps the valve element, it is ensured that press fitting is in place, and meanwhile the quality of the sealing face of a product after press fitting is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of pneumatic solenoid valve core assembly, and in particular relates to a press-fitting fixture capable of protecting a valve core sealing surface from damage. Background Art

[0002] As the core component of liquid rockets, the pneumatic solenoid valve controls the opening and closing of the fluid. The sealing of the valve core in the gas circuit has an important impact on the performance.

[0003] During the installation and testing process, the valve core components including the frame, baffle, valve core and other parts need to be assembled and pressed, and then the internal leakage rate is checked to verify the sealing of the product and ensure the performance of the product. The current existing technologies are all contact surface press-fit fixtures, which are in direct contact with the valve core body. After the force is applied to the press-fit, it will cause indentations on the surface of the valve core, resulting in poor sealing surface quality, affecting the sealing and product performance. Therefore, in order to ensure the sealing quality of the valve core, a set of press-fit fixtures that can effectively protect the sealing surface of the valve core from being affected is required, thereby ensuring the sealing and appearance quality of the valve core assembly after press-fitting. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a press-fitting fixture that is completely non-contact with the valve core sealing surface, which solves the problems of position deviation, fixed limit dimensions, and certain indentations on the sealing position during the press-fitting of the valve core components, resulting in poor sealing surface quality.

[0005] The technical solution adopted by the present invention is: a valve core sealing surface press-fitting fixture, including an adjusting component, a guide protection component and a press-fitting structure, the adjusting component including a cushion block and an adjusting block, the cushion block serving as the base of the entire fixture, the bottom surface of the cushion block being a plane center with a threaded hole processed thereon, the lower portion of the adjusting block being a threaded column for threaded connection with the cushion block, the upper portion being a circular ring structure, the guide protection component including a guide cylinder and a protective pad, the guide cylinder being sleeved on the outer circumference of the adjusting block circular ring, the protective pad being placed on the top surface of the adjusting block circular ring, the valve core assembly being placed in the guide cylinder, the bottom surface of the valve core assembly being in contact with the protective pad, the press-fitting structure being a press-fitting block, the press-fitting block being a circular groove body structure inverted on the outer circumference of the guide cylinder, the center of the groove bottom surface of the press-fitting block being processed with a pressed tapered hole, the opening end of the pressed tapered hole corresponding to the closing position of the top of the skeleton of the valve core assembly.

[0006] Preferably, the inner and outer diameters of the regulating block annular portion are consistent with the inner and outer diameters of the valve core assembly skeleton, the inner diameter of the guide cylinder is gap matched with the outer diameter of the regulating block annular portion, and the inner diameter of the press-fit block is gap matched with the outer diameter of the guide cylinder.

[0007] Preferably, the height of the guide cylinder is equal to the groove depth of the press-fitting block.

[0008] Preferably, the taper of the conical surface area of ​​the pressed conical hole is determined by the final angle required by the index after the upper end of the skeleton is closed, and the small conical end of the pressed conical hole is processed with a vent hole that passes through the bottom surface of the press block.

[0009] Preferably, the protection pad is a copper pad or a fluorine-free pad.

[0010] Preferably, the height of the adjusting block changes by 1.5 mm when the adjusting block thread rotates one circle, and the height of the adjusting block can be adjusted by adjusting the screw-in distance of the thread.

[0011] The beneficial effects of the present invention are: the present invention has a compact structure, and the inner hole and outer circle of the guide cylinder are clearance-matched with the contact parts to meet the coaxiality requirements. This ensures the press-fitting position of the valve core assembly and increases the force-bearing area of ​​the press-fitting process, allowing the valve core to be evenly press-fitted into the skeleton, which can increase the guidance of each part in the radial direction. The axial limit is designed to be adjustable, and the press-fitting distance and limit of the valve core assembly can be controlled by adjusting the threaded positions of the bottom gasket and the adjusting block, which can ensure that the closing position on the skeleton completely wraps the valve core, improves the sealing, ensures that the press-fitting is in place, and at the same time does not affect the sealing surface quality of the product after press-fitting, ensuring that the product has good sealing under air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the valve core sealing surface press-fit fixture structure.

[0013] Figure numerals: 1-pressing block, 2-guide cylinder, 3-adjusting block, 4-pad, 5-protection pad, 6-valve core assembly. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] The valve core sealing surface press-fitting fixture of the present invention is mainly divided into two parts, one part is the adjustment component, the main valve core components are assembled in sequence and placed on the adjustment component, the press-fitting distance is limited, and the press-fitting size is guaranteed. The other part is the press-fitting block, through the taper of the inner hole as the press-fitting distance increases, the frame of the valve core component can be closed, so as to achieve the purpose of press-fitting the valve core sealing surface.

[0016] like Figure 1As shown, a valve core sealing surface press-fitting fixture includes an adjusting component, a guide protection component and a press-fitting structure. The adjusting component includes a cushion block 4 and an adjusting block 3. The cushion block 4 serves as the base of the entire fixture. The bottom surface of the cushion block 4 is a threaded hole processed at the center of the plane. The lower part of the adjusting block 3 is a threaded column for threaded connection with the cushion block 4, and the upper part is a circular ring structure. The guide protection assembly includes a guide cylinder 2 and a protection pad 5. The guide cylinder 2 is sleeved on the outer circumference of the ring of the adjustment block 3. The protection pad 5 is placed on the top surface of the ring of the adjustment block 3. The valve core assembly 6 is placed in the guide cylinder 2. The bottom surface of the valve core assembly 6 contacts the protection pad 5. The press-fit structure is a press-fit block 1. The press-fit block 1 is a circular groove body structure that is inverted on the outer circumference of the guide cylinder 2. A pressed cone hole is processed at the center of the groove bottom surface of the press-fit block 1. The open end of the pressed cone hole corresponds to the top closing position of the skeleton of the valve core assembly 6. The taper of the conical area of ​​the pressed cone hole is determined by the final angle required by the index after the upper end of the skeleton is closed. Generally, the taper of the conical area will be about 30' smaller than the required final angle, which is within the tolerance range. The small conical end of the pressed cone hole is processed with a vent hole that passes through the bottom surface of the press-fit block 1.

[0017] The inner and outer diameters of the circular ring part of the adjusting block 3 are consistent with the inner and outer diameters of the frame of the valve core assembly 6, the inner diameter of the guide cylinder 2 is matched with the outer diameter clearance of the circular ring part of the adjusting block 3, and the inner diameter of the press-fitting block 1 is matched with the outer diameter clearance of the guide cylinder 2 to meet the coaxiality requirements. This ensures the press-fitting position of the valve core assembly 6 and increases the force area of ​​the press-fitting process, so that the valve core can be evenly pressed into the frame.

[0018] The protective pad 5 is a copper pad or a fluorine-free pad, which is a material with low rigidity. It can avoid the high pressure generated during the press-fitting process on the structural surface of the bottom of the frame (in contact with the protective pad) directly contacting the adjustment block and crushing the product. The protective pad 5 will produce plastic deformation after press-fitting, and then the height of the adjustment block 3 needs to be adjusted and press-fitted again. The height of the adjustment block 3 changes by 1.5mm when the thread of the adjustment block rotates one circle. The height of the adjustment block 3 is adjusted by adjusting the screw-in distance of the thread.

[0019] The height of the guide cylinder 2 is equal to the groove depth of the press-fit block 1. By adjusting the threaded position of the bottom pad 4 and the adjusting block 3, the press-fit distance and limit of the valve core assembly 6 can be controlled, which can ensure that the closing position on the frame completely wraps the valve core and improves the sealing performance.

[0020] In order to ensure that the valve core sealing surface press-fitting fixture can better transmit mechanical force, the tooling cushion block 4, press-fitting block 1, and guide cylinder 2 are all made of 1Cr18Ni9Ti stainless steel material, which effectively ensures the transmission of force during the press-fitting process.

[0021] When in use, first place the press-fit block 1 upside down on a horizontal plane (with the notch facing upward), then place the guide cylinder 2 into the press-fit block 1 to ensure the coaxiality of the subsequent parts after assembly, thereby improving the press-fit accuracy of the valve core, and then assemble the valve core assembly 6 and place it into the guide cylinder 2 to ensure that the press-fit plane of the valve core assembly 6 is uniform without deflection or distortion. Then place the protection pad 5 on the valve core assembly 6 to protect the press-fit surface quality of the valve core assembly 6, and finally install the adjustment block 3 on the pad 4, adjust the press-fit size by screwing in the thread, and then place them together into the sleeve in the press-fit block 1 for press-fitting.

[0022] The above are specific embodiments of the present invention and the technical principles used. Any modifications and equivalent changes based on the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve core sealing surface press-fitting fixture, characterized in that: It includes an adjusting component, a guide protection component and a press-fitting structure, wherein the adjusting component includes a cushion block and an adjusting block, the cushion block serves as the base of the entire fixture, the bottom surface of the cushion block is a plane center with a threaded hole, the lower part of the adjusting block is a threaded column for threaded connection with the cushion block, and the upper part is a circular ring structure, the guide protection component includes a guide cylinder and a protective pad, the guide cylinder is sleeved on the outer circumference of the adjusting block ring, the protective pad is placed on the top surface of the adjusting block ring, the valve core assembly is placed in the guide cylinder, the bottom surface of the valve core assembly contacts the protective pad, the press-fitting structure is a press-fitting block, the press-fitting block is a circular groove body structure inverted on the outer circumference of the guide cylinder, a pressed tapered hole is processed at the center of the groove bottom surface of the press-fitting block, and the opening end of the pressed tapered hole corresponds to the closing position of the top of the skeleton of the valve core assembly.

2. The valve core sealing surface press-fitting fixture according to claim 1, characterized in that: The inner and outer diameters of the regulating block annular portion are consistent with the inner and outer diameters of the valve core assembly skeleton, the inner diameter of the guide cylinder is gap matched with the outer diameter of the regulating block annular portion, and the inner diameter of the press-fit block is gap matched with the outer diameter of the guide cylinder.

3. The valve core sealing surface press-fitting fixture according to claim 1, characterized in that: The height of the guide cylinder is equal to the groove depth of the press-fit block.

4. The valve core sealing surface press-fitting fixture according to claim 1, characterized in that: The taper of the conical surface area of ​​the pressed conical hole is determined by the final angle required by the index after the upper end of the frame is closed, and the small conical end of the pressed conical hole is processed with a vent hole that penetrates the bottom surface of the press block.

5. The valve core sealing surface press-fitting fixture according to claim 1, characterized in that: The protection pad is a copper pad or a fluorine-free pad.

6. The valve core sealing surface press-fitting fixture according to claim 1, characterized in that: The height of the adjusting block changes by 1.5 mm when the adjusting block thread rotates one circle. The height of the adjusting block can be adjusted by adjusting the screw-in distance of the thread.

Images