An assembly tooling and assembly method for the upper sealing ring of a one-way valve

Abstract

The present invention specifically relates to an assembly tooling and an assembly method for the sealing ring on a one-way valve, which solve the problems that in the assembly of the existing sealing ring of the one-way valve, due to the lack of a dedicated assembly tooling, the sealing ring is prone to deformation, distortion, and flanging, resulting in low production efficiency and poor sealing performance of aerospace products. The assembly tooling for the sealing ring on the one-way valve includes a fixing frame, a valve seat, and a guide rod; the fixing frame includes a first bracket, a connecting frame, and a second bracket connected in sequence; the first bracket and the second bracket are arranged in parallel, and the first bracket and the second bracket are on the same side of the connecting frame; the valve seat is arranged on the first bracket, a one-way valve is installed in the valve seat, and the valve seat, the guide rod, and the one-way valve are coaxially arranged; the upper end of the guide rod is connected to the second bracket; the lower end of the guide rod corresponds to the top of the one-way valve in the valve seat, and a sealing ring to be installed is sleeved below the push sleeve on the guide rod, and the sealing ring is pushed by the push sleeve along the guide rod and installed in the annular sealing groove on the one-way valve.

Description

Technical Field

[0001] The present invention specifically relates to an assembly tooling and an assembly method for a sealing ring on a check valve. Background Art

[0002] In the assembly process of existing aerospace products, it is not allowed to use lubricating oil and grease, and the volume of the check valve in aerospace products is much smaller than that of general mechanical products. Therefore, the existing assembly methods for check valve sealing rings cannot be applied to the assembly process of aerospace products.

[0003] Currently, when assembling the sealing ring of the check valve of aerospace products, the method of manually pressing the sealing ring is usually adopted. However, during the pressing process, the force on each position of the sealing ring is uneven, resulting in phenomena such as deformation, distortion, and flanging of the sealing ring, which affects the sealing quality of aerospace products; moreover, the process of repeated disassembly and assembly makes the workload large, time-consuming, and easily causes damage to the check valve. And after assembling the aerospace products, problems cannot be found through visual inspection, and only the sealing performance can be checked during the test. The process of multiple up and down racking and disassembly and assembly not only causes production waste but also seriously affects production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that in the assembly of the existing check valve sealing ring, due to the lack of a dedicated assembly tooling, the sealing ring is prone to deformation, distortion, and flanging, resulting in low production efficiency and poor sealing performance of aerospace products, and to provide an assembly tooling and an assembly method for a sealing ring on a check valve.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] An assembly tooling for a sealing ring on a check valve, characterized in that it includes a fixed frame, a valve seat, and a guide rod;

[0007] The fixed frame includes a first bracket, a connecting frame, and a second bracket connected in sequence; the first bracket and the second bracket are arranged in parallel, and the first bracket and the second bracket are on the same side of the connecting frame;

[0008] The valve seat is arranged on the first bracket and is located between the first bracket and the second bracket; a check valve is installed in the valve seat, and the valve seat, the guide rod, and the check valve are coaxially arranged;

[0009] An installation hole is provided on the first bracket, and the installation hole is used for coaxially installing the valve seat; the second bracket is used for positioning the guide rod;

[0010] The guide rod is located between the first bracket and the second bracket, and a push sleeve is sleeved on the guide rod; the upper end of the guide rod is detachably connected to the second bracket; the lower end of the guide rod corresponds to the top of the one-way valve in the valve seat, and a sealing ring to be installed is sleeved below the push sleeve on the guide rod, and the sealing ring is pushed by the push sleeve to be installed in the annular sealing groove on the one-way valve along the guide rod.

[0011] Further, the guide rod includes a straight section, a diffusion section and an introduction section which are connected in sequence;

[0012] The outer wall surface of the diffusion section is a conical surface, the large-diameter end of the conical surface is downward, and the cone angle of the diffusion section is 5°.

[0013] Further, the push sleeve includes an upper push sleeve and a lower push sleeve;

[0014] The upper end of the lower push sleeve is a ring structure and is connected to the upper push sleeve; a plurality of through grooves penetrating the lower end surface are formed in the side wall of the lower end of the lower push sleeve, the plurality of through grooves are circumferentially distributed, and a first annular groove is arranged on the inner wall of the lower end surface of the lower push sleeve for pushing the sealing ring;

[0015] The inner diameter of the first annular groove is larger than the diameter of the introduction section.

[0016] Further, an installation groove is arranged at the end of the lower end of the guide rod for installing and positioning the top of the one-way valve;

[0017] A second annular groove is arranged on the outer wall of the lower end of the lower push sleeve in the circumferential direction for installing a rubber ring. The rubber ring in the second annular groove ensures that the lower push sleeve expands uniformly during the assembly process.

[0018] Further, it further includes two positioning screws and a pressing piece;

[0019] A first installation groove adapted to the upper end of the guide rod is arranged at one end of the second bracket; a second installation groove matching the first installation groove is arranged on the pressing piece;

[0020] The upper end of the guide rod is installed in the space formed by the first installation groove and the second installation groove through the pressing piece by the two positioning screws.

[0021] Further, the valve seat and the one-way valve are in clearance fit;

[0022] The guide rod and the upper push sleeve are in clearance fit.

[0023] Further, the clearance between the valve seat and the one-way valve is 0.035 - 0.06 mm;

[0024] The clearance between the guide rod and the upper push sleeve is 0.01 - 0.062 mm.

[0025] Further, the size of the fixing bracket is 62mm × 120mm × 25mm;

[0026] The inner wall roughness of the valve seat is less than or equal to 0.4;

[0027] The outer wall roughness of the guide rod is less than or equal to 0.8;

[0028] The inner wall roughness of the upper push sleeve and the lower push sleeve is less than or equal to 1.6;

[0029] The perpendicularity between the bottom of the valve seat and the inner wall of the valve seat is less than or equal to 0.025;

[0030] The reference deviation between the central axis of the valve seat and the central axis of the guide rod is less than or equal to 0.04.

[0031] Further, the first bracket, the second bracket and the connecting bracket are all made of 1Cr18Ni9Ti stainless steel;

[0032] The upper push sleeve and the lower push sleeve are both made of polytetrafluoroethylene;

[0033] The rubber ring is 1D1107 - 10.6×1.9 - P;

[0034] The positioning screw is a stainless steel high - head knurled screw M3×8;

[0035] The thickness of the pressing piece is 4mm.

[0036] Meanwhile, the present invention also provides a method for assembling the upper sealing ring of a one - way valve. Based on the above - mentioned assembling tooling for the upper sealing ring of a one - way valve, the special feature lies in the following steps:

[0037] Step 1: Install the one - way valve into the valve seat, then install the sealing ring below the push sleeve on the guide rod, and then fix the guide rod and the second bracket; finally, adjust the position of the valve seat and install the valve seat on the first bracket so that the valve seat, the guide rod and the one - way valve are coaxially arranged;

[0038] Step 2: Push the push sleeve on the guide rod, so that the push sleeve drives the sealing ring to slide down along the guide rod until the sealing ring is assembled into the annular sealing groove on the one - way valve, completing the assembly of the upper sealing ring of the one - way valve.

[0039] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0040] (1) For the assembling tooling for the upper sealing ring of a one - way valve in the present invention, when assembling the sealing ring for the one - way valve, only need to fix the one - way valve in the valve seat, and then push the push sleeve on the guide rod, then the sealing ring can be installed on the one - way valve, which can ensure that the sealing ring is uniformly stressed and avoid the assembly problems of the sealing ring such as deformation, distortion and flanging.

[0041] (2) The upper seal ring assembly tooling for the one-way valve of the present invention adopts the cooperation of the upper push sleeve, the lower push sleeve and the rubber ring. By means of the continuous diameter variation and unified installation of the upper push sleeve and the lower push sleeve along the guide rod, the one-way valve and the seal ring will not be damaged during the assembly process.

[0042] (3) The upper seal ring assembly tooling for the one-way valve of the present invention utilizes the fixed frame, the valve seat and the guide rod to simplify the operation of assembling the upper seal ring of the one-way valve, greatly reducing the workload of assembling the seal ring onto the one-way valve and significantly improving the operation efficiency.

[0043] (4) The upper seal ring assembly tooling for the one-way valve of the present invention overcomes the complex process of multiple repeated disassembly and assembly during the traditional assembly of the seal ring for the one-way valve, ensures the assembly quality of the seal ring, and further improves the sealing performance of aerospace products. Description of the Drawings

[0044] Figure 1 is a schematic structural diagram of the working state in the embodiment of the upper seal ring assembly tooling for the one-way valve of the present invention;

[0045] Figure 2 is Figure 1 the schematic view in the A direction in

[0046] Figure 3 is a schematic structural diagram of the guide rod in the embodiment of the upper seal ring assembly tooling for the one-way valve of the present invention;

[0047] Figure 4 is Figure 3 the enlarged schematic view at B in

[0048] Figure 5 is a schematic structural diagram of the push sleeve in the embodiment of the upper seal ring assembly tooling for the one-way valve of the present invention;

[0049] Figure 6 is Figure 5 the sectional view taken along the A-A direction in

[0050] Figure 7 is a schematic structural diagram of the valve seat in the embodiment of the upper seal ring assembly tooling for the one-way valve of the present invention;

[0051] Figure 8 is a schematic structural diagram of the fixed frame in the embodiment of the upper seal ring assembly tooling for the one-way valve of the present invention;

[0052] Figure 9 is a schematic view of one end face of the second bracket in the embodiment of the upper seal ring assembly tooling for the one-way valve of the present invention.

[0053] The reference signs in the drawings are:

[0054] 1 - Fixing bracket, 101 - First bracket, 102 - Second bracket, 103 - Connecting bracket; 2 - Valve seat, 3 - Guide rod, 301 - Straight section, 302 - Diffusion section, 303 - Introduction section; 4 - Check valve, 5 - Pushing sleeve, 501 - Upper pushing sleeve, 502 - Lower pushing sleeve, 6 - Sealing ring, 7 - First annular groove, 8 - Rubber ring, 9 - Second annular groove, 10 - Set screw, 11 - Installation groove, 12 - Pressing piece. Detailed implementation mode

[0055] As Figure 1 、 Figure 2 As shown in the figure, an assembly tool for the upper sealing ring of a check valve includes a fixing bracket 1, a valve seat 2, a guide rod 3, two set screws 10 and a pressing piece 12;

[0056] The fixing bracket 1 includes a first bracket 101, a connecting bracket 103 and a second bracket 102 connected in sequence; the first bracket 101 and the second bracket 102 are arranged in parallel, and the first bracket 101 and the second bracket 102 are on the same side of the connecting bracket 103. In this embodiment, the first bracket 101 is movably connected to the connecting bracket 103.

[0057] The valve seat 2 is arranged on the first bracket 101 and is located between the first bracket 101 and the second bracket 102; a check valve 4 is installed in the valve seat 2, and the valve seat 2, the guide rod 3 and the check valve 4 are coaxially arranged.

[0058] The first bracket 101 is provided with an installation hole for coaxially installing the valve seat 2; the second bracket 102 is used for positioning the guide rod 3.

[0059] The guide rod 3 is located between the first bracket 101 and the second bracket 102, and a pushing sleeve 5 is sleeved on the guide rod 3; the upper end of the guide rod 3 is detachably connected to the second bracket 102, the lower end of the guide rod 3 corresponds to the top of the check valve 4 in the valve seat 2, and the part of the guide rod 3 below the pushing sleeve 5 is used for sleeving the sealing ring 6 to be installed. The sealing ring 6 is pushed by the pushing sleeve 5 to be installed in the annular sealing groove on the check valve 4 along the guide rod 3.

[0060] As Figure 3 、 Figure 4 As shown in the figure, the guide rod 3 includes a straight section 301, a diffusion section 302 and an introduction section 303 connected in sequence; the outer wall surface of the diffusion section 302 is a conical surface, the large diameter end of the conical surface faces downward, and the cone angle of the diffusion section 302 is 5°.

[0061] As Figure 5 、 Figure 6As shown in the figure, the push sleeve 5 includes an upper push sleeve 501 and a lower push sleeve 502; the upper end of the lower push sleeve 502 is a ring structure and is connected to the upper push sleeve 501; a plurality of through grooves penetrating the lower end surface are provided on the side wall of the lower end of the lower push sleeve 502, and the plurality of through grooves are circumferentially evenly distributed. In this embodiment, four through grooves penetrating the lower end surface are provided on the side wall of the lower end, and the four through grooves are circumferentially evenly distributed to form a four-lobe structure. Moreover, a first annular groove 7 is provided on the inner wall of the lower end of the lower push sleeve 502, and the first annular groove 7 is used to push the sealing ring 6; the inner diameter of the first annular groove 7 is larger than the diameter of the introduction section 303. A second annular groove 9 is provided on the outer wall of the lower end of the lower push sleeve 502 along the circumferential direction, and the second annular groove 9 is used to install the rubber ring 8.

[0062] In this embodiment, an installation groove is provided at the lower end of the guide rod 3, and the installation groove is used to install the top of the one-way valve 4 and perform positioning; the diffusion angle (i.e., the cone angle) of the diffusion section 302 of the guide rod 3 is 5°, and its main function is to guide the rubber ring 8 in the second annular groove 9 on the lower push sleeve 502 to be evenly stretched and expanded, so that the force acting on the sealing ring 6 in the first annular groove 7 is uniform, preventing problems such as torsion, flanging, and inclination of the sealing ring 6 during the assembly process. A clearance fit is provided between the guide rod 3 and the upper push sleeve 501, achieving a good positioning effect. The required fit clearance is small, being 0.05 mm. In order to ensure that the upper push sleeve 501 and the lower push sleeve 502 slide evenly on the guide rod 3, the surface roughness of the outer surface of the guide rod 3 is designed to be 0.8, and chamfers are provided at all parts of the outside of the guide rod 3, to a certain extent avoiding damage to the sealing ring 6 and affecting the performance and service life of the sealing ring 6. Preferably, the rubber ring 8 is selected as the O-ring rubber seal 61D1107-10.6 × 1.9-P.

[0063] The functions of the upper push sleeve 501 and the lower push sleeve 502 are to push the sealing ring 6 to slide on the guide rod 3. To ensure the normal sliding of the upper push sleeve 501 and the lower push sleeve 502 on the guide rod 3, the surface roughness of the inner wall of the upper push sleeve 501 and the inner wall of the lower push sleeve 502 needs to be designed to be 1.6. The bottom of the lower push sleeve 502 is designed into a four-lobe structure with uniform distribution. Using the stretching performance of the rubber thereon, it is ensured that each position of the sealing ring 6 on the one-way valve 4 is continuously and evenly pushed into the groove on the one-way valve 4. Preferably, in this embodiment, both the upper push sleeve 501 and the lower push sleeve 502 are made of polytetrafluoroethylene.

[0064] As Figure 1 、 Figure 7As shown in the figure, in order to ensure that the valve seat 2 does not damage the check valve 4 during the assembly process, the inner surface roughness of the valve seat 2 is designed to be 0.4, and the valve seat 2 and the check valve 4 are in clearance fit with a fit clearance of 0.06 mm. The perpendicularity between the bottom of the valve seat 2 and the inner wall of the valve seat 2 is designed to be 0.025. Further, in order to better ensure the assembly quality of the sealing ring 6 on the check valve 4, good coaxiality is required between the valve seat 2 and the fixing bracket 1. Therefore, during the design, by adjusting the position of the valve seat 2 on the first bracket 101, the reference deviation of the central axis of the valve seat 2 from the central axis of the guide rod 3 is ensured to be 0.04. After adjustment, the valve seat 2 is fixed to the first bracket 101 with screws.

[0065] As Figure 1 , Figure 2 , Figure 8 , Figure 9 shown in the figure, considering the hardness and toughness of the stainless steel 1Cr18Ni9Ti material, the first bracket 101, the second bracket 102 and the connecting bracket 103 are all made of 1Cr18Ni9Ti stainless steel; the overall outer shape length of the guide rod 3 and the fixing bracket 1 should not be too long. Therefore, the outer dimensions of the designed fixing bracket 1 are 62 mm × 120 mm × 25 mm, which ensures the strength and toughness of the tooling of the present invention to the greatest extent while leaving sufficient operating space for pushing and adjusting the upper push sleeve 501 and the lower push sleeve 502. For the convenience of processing, a first installation groove 11 adapted to the upper end of the guide rod 3 is provided at one end of the second bracket 102; a second installation groove matching the first installation groove 11 is provided on the pressing piece 12; the upper end of the guide rod 3 is installed in the space formed by the first installation groove 11 and the second installation groove through the pressing piece 12 and two positioning screws 10. Among them, the two positioning screws 10 cooperate with the pressing piece 12 to adjust the movement margin of the upper end of the guide rod 3 and the perpendicularity between the guide rod 3 and the valve seat 2 and the check valve 4. Preferably, the two positioning screws 10 are stainless steel high-head knurled screws M3×8; the thickness of the pressing piece 12 is 4 mm.

[0066] The working process of the above embodiment is as follows:

[0067] Before use, first install the check valve 4 into the valve seat 2, then install the sealing ring 6 onto the guide rod 3, and then fix the guide rod 3 and the second bracket 102 by using the pressing piece 12 and two positioning screws 10; finally, adjust the position of the valve seat 2 by using the first bracket 101 and the connecting bracket 103, and install the valve seat 2 on the first bracket 101 so that the valve seat 2, the guide rod 3 and the check valve 4 are coaxially arranged, and ensure that the reference deviation of the central axis of the valve seat 2 from the central axis of the guide rod 3 is 0.04, and then tighten the two positioning screws 10 on the first bracket 101.

[0068] In use, by pushing the upper push sleeve 501 on the guide rod 3, the upper push sleeve 501 and the lower push sleeve 502 drive the sealing ring 6 to slide along the guide rod 3 until the sealing ring 6 is assembled into the annular sealing groove on the one-way valve 4. By using this tooling, it is ensured that during the assembly process of the sealing ring 6 on the one-way valve 4, the sealing ring 6 is uniformly stressed, and after the sealing ring 6 is installed on the one-way valve 4, the rubber ring 8 pushes the lower push sleeve 502 and the upper push sleeve 501 back to the straight section 301 of the guide tube.

[0069] After assembly, loosen the two positioning screws 10 so that the guide rod 3 can move upward, and then take out the one-way valve 4 with the sealing ring 6 assembled in the valve seat 2.

Claims

1. A sealing ring assembly tooling for a check valve, characterized in that: It includes a fixing frame (1), a valve seat (2) and a guide rod (3); The fixing frame (1) includes a first bracket (101), a connecting frame (103) and a second bracket (102) connected in sequence; the first bracket (101) and the second bracket (102) are arranged in parallel, and the first bracket (101) and the second bracket (102) are on the same side of the connecting frame (103); The valve seat (2) is arranged on the first bracket (101) and is located between the first bracket (101) and the second bracket (102); a check valve (4) is installed in the valve seat (2), and the valve seat (2), the guide rod (3) and the check valve (4) are coaxially arranged; An installation hole is provided on the first bracket (101), and the installation hole is used for coaxially installing the valve seat (2); the second bracket (102) is used for positioning the guide rod (3); The guide rod (3) is located between the first bracket (101) and the second bracket (102), and a push sleeve (5) is sleeved on the guide rod (3); the upper end of the guide rod (3) is detachably connected to the second bracket (102); an installation groove is provided at the lower end of the guide rod (3), and the installation groove is used for installing the top of the check valve (4) and positioning it; the lower end of the guide rod (3) corresponds to the top of the check valve (4) in the valve seat (2), and a sealing ring (6) to be installed is sleeved on the guide rod (3) below the push sleeve (5), and the sealing ring (6) is pushed by the push sleeve (5) to be installed in the annular sealing groove on the check valve (4) along the guide rod (3); The guide rod (3) includes a straight section (301), a diffusing section (302) and a guiding section (303) connected in sequence; the outer wall surface of the diffusing section (302) is a conical surface, the large-diameter end of the conical surface faces downward, and the cone angle of the diffusing section (302) is 5°; The push sleeve (5) includes an upper push sleeve (501) and a lower push sleeve (502); the upper end of the lower push sleeve (502) is a ring structure and is connected to the upper push sleeve (501); a plurality of through slots penetrating the lower end surface are provided on the side wall of the lower end of the lower push sleeve (502), the plurality of through slots are circumferentially distributed, and a first annular groove (7) is provided on the inner wall of the lower end surface of the lower push sleeve (502) for pushing the sealing ring (6); the inner diameter of the first annular groove (7) is larger than the diameter of the guiding section (303); a second annular groove (9) is provided on the outer wall of the lower end of the lower push sleeve (502) in the circumferential direction, and the second annular groove (9) is used for installing a rubber ring (8).

2. The assembly tooling for the sealing ring on a check valve according to claim 1, wherein: It further includes two positioning screws (10) and a pressing piece (12); One end of the second bracket (102) is provided with a first installation groove (11) adapted to the upper end of the guide rod (3); a second installation groove matching the first installation groove (11) is provided on the pressing piece (12); The two positioning screws (10) install the upper end of the guide rod (3) in the space formed by the first installation groove (11) and the second installation groove through the pressing piece (12).

3. The assembly tooling for the upper sealing ring of a check valve according to claim 2, characterized in that: The valve seat (2) and the check valve (4) are in clearance fit; The guide rod (3) and the upper push sleeve (501) are in clearance fit.

4. The assembly tooling for the upper sealing ring of a check valve according to claim 3, characterized in that: The clearance between the valve seat (2) and the check valve (4) is 0.035 - 0.06 mm; The clearance between the guide rod (3) and the upper push sleeve (501) is 0.01 - 0.062 mm.

5. The assembly tooling for the upper sealing ring of a check valve according to claim 4, characterized in that: The size of the fixing frame (1) is 62 mm × 120 mm × 25 mm; The inner wall roughness of the valve seat (2) is less than or equal to 0.4; The outer wall roughness of the guide rod (3) is less than or equal to 0.8; The inner wall roughness of the upper push sleeve (501) and the inner wall roughness of the lower push sleeve (502) are less than or equal to 1.6; The perpendicularity between the bottom of the valve seat (2) and the inner wall of the valve seat (2) is less than or equal to 0.025; The reference deviation between the central axis of the valve seat (2) and the central axis of the guide rod (3) is less than or equal to 0.

04.

6. The assembly tooling for the upper sealing ring of a check valve according to claim 5, characterized in that: The first bracket (101), the second bracket (102) and the connecting frame (103) are all made of 1Cr18Ni9Ti stainless steel; The upper push sleeve (501) and the lower push sleeve (502) are both made of polytetrafluoroethylene; The rubber ring (8) is 1D1107 - 10.6 × 1.9 - P; The positioning screw (10) is a stainless steel high - head knurled screw M3 × 8; The thickness of the pressing piece (12) is 4 mm.

7. A method for assembling the upper sealing ring of a check valve, based on the assembling tooling for the upper sealing ring of a check valve according to any one of claims 1-6, characterized in that, It includes the following steps: Step 1: Install the check valve (4) into the valve seat (2), then install the sealing ring (6) below the push sleeve (5) on the guide rod (3), then fix the guide rod (3) and the second bracket (102); finally, adjust the position of the valve seat (2) and install the valve seat (2) on the first bracket (101) so that the valve seat (2), the guide rod (3) and the check valve (4) are coaxially arranged; Step 2: By pushing the push sleeve (5) on the guide rod (3), make the push sleeve (5) drive the sealing ring (6) to slide down along the guide rod (3) until the sealing ring (6) is assembled into the annular sealing groove on the check valve (4), and complete the assembly of the sealing ring (6) on the check valve (4).

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