A high temperature resistant one-way valve and its processing technology

Abstract

The present invention relates to the field of valve technology, and specifically to a high-temperature resistant one-way valve and its processing technology. Its technical solution is as follows: it includes a valve body, the valve body is provided with an inner cavity, a fluid outlet is provided above the inner cavity and is connected to the inner cavity, a fluid inlet is provided below the inner cavity and is connected to the inner cavity, the inner cavity is divided into a guide section and a sealing section, and the sealing section is cylindrical; a valve core, the valve core is movably arranged in the inner cavity, the valve core is divided into a guide body and a sealing body, a guide groove is provided in the longitudinal direction of the guide body, the guide body section and the guide section are gap-matched, and the sealing body is matched with the sealing section. This one-way valve has a spring-free design and completes the sealing function through the weight of its valve core itself, overcoming the technical difficulty of traditional one-way valves losing their sealing performance due to the failure of spring elasticity in high-temperature environments; this one-way valve has a simple structure and low maintenance and repair costs; this one-way valve extends its service life and reduces the production and maintenance costs of the enterprise.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a high-temperature resistant one-way valve and a processing technology thereof. Background Art

[0002] A check valve is a directional control valve that allows airflow in one direction only, preventing reverse flow. While a wide variety of check valves are available on the market, some technical issues still exist due to the unique nature of certain applications. For example, in high-temperature environments, most check valves utilize an internal spring to seal their circuit. However, prolonged exposure to high temperatures can cause the spring's elastic force to decay rapidly, ultimately losing its elasticity. This can render the check valve ineffective, leading to equipment failure, production accidents, and even life-threatening situations. Consequently, the service life of most check valves is significantly shortened due to high temperatures, increasing maintenance costs for businesses, directly impacting production efficiency, and even posing a potential safety hazard. Summary of the Invention

[0003] One aspect of the present disclosure provides a one-way valve and a processing technology for the one-way valve, which aims to solve the stability of the one-way valve in a high-temperature environment, extend the service life of the one-way valve, and save maintenance costs.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions, which include:

[0005] A valve body, wherein the valve body is provided with an inner cavity, a gas outlet is provided above the inner cavity and is communicated with the inner cavity, and a gas inlet is provided below the inner cavity and is communicated with the inner cavity, wherein the inner cavity includes a guide section and a sealing section, wherein the guide section is provided above the sealing section, the sealing section is cylindrical, and the guide section is square or cylindrical, and the inner diameter of the guide section is larger than the inner diameter of the sealing section;

[0006] The valve core is movably arranged in the inner cavity of the valve body. The valve core is divided into a guide body and a sealing body. The guide body is provided with a guide groove in the longitudinal direction. The guide groove is used for gas circulation when the one-way valve is opened. The guide body and the guide section are clearance-matched. The sealing body is conical and cooperates with the sealing section.

[0007] The inner diameter of the sealing section is smaller than the maximum outer diameter of the sealing body.

[0008] Furthermore, a retaining ring is provided at the gas outlet, and a retaining ring groove matching the retaining ring is provided on the cavity wall of the inner cavity.

[0009] Furthermore, a cover plate is provided on the top of the valve body, and a through hole is provided on the cover plate, and the through hole is connected to the gas outlet.

[0010] Preferably, the sealing body is in the shape of a truncated cone, that is, a frustum, and the inner diameter of the sealing section is between the outer diameters of the upper and lower bottom surfaces of the sealing body.

[0011] Preferably, the sealing body and the sealing section are in a sealing fit.

[0012] A processing technology for the high temperature resistant one-way valve is characterized in that it includes the processing technology for the valve core and the valve body.

[0013] The processing technology of the valve core includes the following steps:

[0014] (1) Select forgings;

[0015] (2) Rough turning: the forging of step (1) is turned into a cylindrical guide body and a truncated cone-shaped sealing body with a roughness of Ra3.2 μm and a conical surface allowance of 1 mm for the sealing body;

[0016] (3) Check the appearance quality and check whether the workpiece processed in step (2) has forging defects;

[0017] (4) Finish turning: Finish turning the workpiece of step (3) to ensure that the grinding allowance of the guide body sliding surface and the sealing body conical surface size is ≮0.15-0.2mm, the roughness reaches Ra1.6um, and a weight reduction balance block allowance of 0.2-0.5mm is reserved on the plane of the guide body;

[0018] (5) milling, milling a plurality of guide grooves on the guide body of step (4), and the guide grooves are evenly distributed on the circumference of the guide body;

[0019] (6) Heat treatment: heat treatment the workpiece of step (5) in a vacuum furnace at a temperature of 1270-1285°C and a tempering temperature of 550-570°C, and quenching it with heat treatment oil. After quenching, the workpiece has an HRC of ≮62;

[0020] (7) Grinding: Grind the workpiece of step (6) to make a smooth transition between the cylindrical surface of the guide body and the conical surface of the sealing body, with a roughness of Ra0.8um;

[0021] (8) De-weighting grinding: De-weighting the upper plane of the guide body in step (7) to make the valve core meet the design weight;

[0022] (9) Strengthening treatment: Strengthen the surface strength and roughness of the workpiece in step (8). After processing, the surface strength HRC≮65 and the roughness Ra0.2um or above;

[0023] (10) Valve core inspection;

[0024] The valve body processing process includes the following steps:

[0025] (1) Select forgings;

[0026] (2) Rough turning: rough machining the outer surface of the forging in step (1) and drilling the center inner hole;

[0027] (3) Check the appearance quality and check whether the workpiece processed in step (2) has forging defects;

[0028] (4) Heat treatment: heat treatment the workpiece of step (3) at a temperature of 900-1000°C, oil quenching for 1-2 hours, keeping at 700-820°C for 12-16 hours, air cooling, and the workpiece hardness is between HB227 and 269;

[0029] (5) Finish turning: Finish the outer surface and inner hole of the workpiece in step (4) to a roughness of Ra1.6 μm or more and a flat end surface;

[0030] (6) Turn the workpiece of step (5) around, align it according to the outer circle, finish-machine the guide section of the inner cavity, flatten the end surface and chamfer it 0.5x45°, and turn the retaining ring groove;

[0031] (7) Valve body inspection.

[0032] The equipment used for the strengthening treatment in step (9) of the valve core processing technology is Hawking equipment.

[0033] Furthermore, the above process also includes assembly and pressure testing.

[0034] Compared with the existing technology, the one-way valve of the present invention has a spring-free design and completes the sealing function through the weight of the valve core itself, overcoming the technical difficulty that the traditional one-way valve loses its sealing performance due to the failure of the spring elasticity in a high-temperature environment; secondly, the one-way valve has a simple structure and low maintenance and repair costs; thirdly, the one-way valve extends its service life and reduces the company's production and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure according to one aspect of the present disclosure;

[0036] Figure 2 is a schematic diagram of a valve body structure according to one aspect of the present disclosure;

[0037] Figure 3 is a schematic diagram of a valve core structure according to one aspect of the present disclosure;

[0038] Figure 4 is a schematic diagram of a cross-sectional structure of a valve core according to one aspect of the present disclosure;

[0039] In the figure, 1-valve body, 2-valve core, 3-gas outlet, 4-gas inlet, 5-retaining ring, 6-guide groove, 7-guide section, 8-sealing section. DETAILED DESCRIPTION

[0040] The present invention will be further explained below in conjunction with specific embodiments, but is not intended to limit the present invention. The structures, proportions, sizes, etc. illustrated in the accompanying drawings are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read, and are not intended to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantial technical significance. Any structural modification, change in proportional relationship, or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, terms such as "upper", "lower", "front", "back", and "middle" cited in this specification are only for the convenience of description and are not intended to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0041] According to an embodiment of one aspect of the present disclosure, Figure 1-4 As shown, the high-temperature resistant one-way valve includes a valve body 1, the valve body 1 is provided with an inner cavity, a gas outlet 3 is provided above the inner cavity and connected thereto, a retaining ring 5 is provided at the gas outlet 3, a retaining ring groove matching the retaining ring 5 is provided on the cavity wall of the inner cavity, and a gas inlet 4 is provided below the inner cavity and connected thereto, the inner cavity includes a guide section 7 and a sealing section 8, the guide section 7 is provided above the sealing section 8, the guide section 7 and the sealing section 8 are both cylindrical, and the inner diameter of the guide section 7 is larger than the inner diameter of the sealing section 8;

[0042] The valve core 2 is movably arranged in the inner cavity of the valve body 1. The valve core 2 is divided into a guide body 9 and a sealing body 10. The guide body 9 is provided with a guide groove 6 in the longitudinal direction. The guide groove 6 is used for gas circulation when the one-way valve is opened. The guide body 9 and the guide section 7 are clearance-matched; the sealing body 10 is a truncated cone, that is, a frustum. The inner diameter of the sealing section 8 is between the outer diameters of the upper and lower bottom surfaces of the sealing body 10, and the sealing body 10 and the sealing section 8 are sealingly matched.

[0043] The above-mentioned high-temperature resistant one-way valve is installed vertically, that is, the lower end of the one-way valve is the gas inlet 4, and the gas enters the valve body 1 from below. After the gas flows in, it generates an upward force on the valve core 2. When the upward force of the gas is greater than the gravity of the valve core 2, the one-way valve is opened, and the gas is discharged from the outlet 3 of the one-way valve through the guide groove 6 of the valve core 2. When the gas flow is cut off or the gas pressure is less than the gravity of the valve core 2, the valve core 2 is sealed with the sealing section 8 of the valve body 1 under the action of gravity, and the one-way valve is closed.

[0044] If there is backflow at the outlet 3 of the one-way valve, that is, gas will flow into the outlet, at this time, the upward pressure of the gas entering from the one-way valve inlet 4 on the valve core 2 must be greater than the gravity of the valve core 2 and the downward pressure of the gas entering from the outlet on the valve core 2 in order to open.

[0045] A processing technology for a high-temperature resistant one-way valve, including a processing technology for a valve core and a valve body,

[0046] The processing technology of the valve core includes the following steps:

[0047] (1) Select forgings, choose W18Cr4Vφ25mm forgings, and its annealing state HB≯255;

[0048] (2) Rough turning: the forging of step (1) is turned into a cylindrical guide body and a truncated cone-shaped sealing body, with a roughness of Ra3.2 μm, an outer diameter of the workpiece of φ23 mm, and a conical surface allowance of 1 mm for the sealing body;

[0049] (3) Check the appearance quality and check whether the workpiece processed in step (2) has forging defects;

[0050] (4) Finish turning: Finish turning the workpiece of step (3) to ensure that the grinding allowance of the guide body sliding surface and the sealing body conical surface size is ≮0.15-0.2mm, the outer diameter of the workpiece is φ22(0 / -0.02)mm, the roughness reaches Ra1.6um, and a weight reduction balance block allowance of 0.2-0.5mm is reserved on the plane of the guide body;

[0051] (5) Milling: Mill six guide grooves with a depth of 3 mm from the guide body of step (4), and the six guide grooves are evenly distributed on the circumference of the guide body;

[0052] (6) Heat treatment: heat treatment the workpiece of step (5) in a vacuum furnace at a temperature of 1280°C and a tempering temperature of 560°C, and quenching the workpiece with heat treatment oil. After quenching, the workpiece has an HRC of ≮62;

[0053] (7) Grinding: Grind the workpiece of step (6) to an outer diameter of φ22(-0.04) mm, so that the cylindrical surface of the guide body and the conical surface of the sealing body have a smooth transition, with a roughness of Ra0.8 μm;

[0054] (8) De-weighting grinding: De-weighting the upper surface of the guide body in step (7) to make the valve core weight 0.086 kg;

[0055] (9) Strengthening treatment: Use Hawking equipment to strengthen the surface strength and roughness of the workpiece in step (8). After processing, the surface strength HRC≮65 and the roughness Ra0.2um or above;

[0056] (10) Valve core inspection;

[0057] The valve body processing process includes the following steps:

[0058] (1) Select forgings, choose 1Cr15Ni25Ti2MoVBφ25mm forgings;

[0059] (2) Rough turning: rough-machine the outer surface of the forging in step (1), turn the outer diameter to φ22mm, and drill the center inner hole to φ6mm;

[0060] (3) Check the appearance quality and check whether the workpiece processed in step (2) has forging defects;

[0061] (4) Heat treatment: heat treatment the workpiece of step (3) at 900°C, oil quenching for 2 hours, keeping at 700°C for 15 hours, and air cooling, so that the hardness of the workpiece is between HB227 and 269;

[0062] (5) Finish turning: Finish turning the outer surface of the workpiece in step (4) to φ21(-0.05) mm, the inner hole to φ8 mm, the roughness Ra1.6 um or more, and the end surface to be flat;

[0063] (6) Turn the workpiece of step (5) around, align it according to the outer circle, and finish-machine the guide section of the inner cavity. The guide section is φ12 (+0.10 / +0.07) mm, with a flat end face and chamfer of 0.5x45°, and a retaining ring groove;

[0064] (7) Valve body inspection.

[0065] Assemble the valve core and valve body and perform a pressure test.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A process for manufacturing a high-temperature resistant one-way valve, the high-temperature resistant one-way valve comprising a valve body, the valve body defining an inner cavity, a gas outlet disposed above the inner cavity and communicating therewith, and a gas inlet disposed below the inner cavity and communicating therewith, the inner cavity comprising a guide section and a sealing section, the guide section being disposed above the sealing section, the sealing section being cylindrical, and the inner diameter of the guide section being larger than the inner diameter of the sealing section; The valve core is movably arranged in the inner cavity of the valve body. The valve core is divided into a guide body and a sealing body. The guide body is provided with a guide groove in the longitudinal direction. The guide groove is used for gas circulation when the one-way valve is opened. The guide body and the guide section are clearance-matched. The sealing body is conical and cooperates with the sealing section. The inner diameter of the sealing section is smaller than the maximum outer diameter of the sealing body; Its characteristics are: The processing technology of the high temperature resistant one-way valve includes the processing technology of the valve core and the valve body. The processing technology of the valve core includes the following steps: (1) Select forgings; (2) Rough turning: the forging of step (1) is turned into a cylindrical guide body and a truncated cone-shaped sealing body with a roughness of Ra3.2um and a conical surface allowance of 1mm for the sealing body; (3) Check the appearance quality and check whether the workpiece processed in step (2) has forging defects; (4) Finish turning: Finish turning the workpiece of step (3) to ensure that the grinding allowance of the guide body sliding surface and the sealing body conical surface size is ≮0.15-0.2mm, the roughness reaches Ra1.6um, and a weight reduction balance block allowance of 0.2-0.5mm is reserved on the plane of the guide body; (5) milling, milling a plurality of guide grooves on the guide body of step (4), and the guide grooves are evenly distributed on the circumference of the guide body; (6) Heat treatment: heat treatment the workpiece of step (5) in a vacuum furnace at a temperature of 1270-1285°C and a tempering temperature of 550-570°C, and quenching it with heat treatment oil. After quenching, the workpiece has an HRC of ≮62; (7) Grinding: Grind the workpiece of step (6) to make a smooth transition between the cylindrical surface of the guide body and the conical surface of the sealing body, with a roughness of Ra0.8um; (8) De-weighting grinding: De-weighting the upper plane of the guide body in step (7) to make the valve core meet the design weight; (9) Strengthening treatment, strengthening the surface strength and roughness of the workpiece in step (8), and the surface strength after processing is HRC≮65 and the roughness is Ra0.2um or above; the equipment used for the strengthening treatment is Hawking equipment; (10) Valve core inspection; The valve body processing process includes the following steps: (1) Select forgings; (2) Rough turning: rough machining the outer surface of the forging in step (1) and drilling the center inner hole; (3) Check the appearance quality and check whether the workpiece processed in step (2) has forging defects; (4) Heat treatment: heat treatment the workpiece of step (3) at a temperature of 900-1000°C, oil quenching for 1-2 hours, keeping at 700-820°C for 12-16 hours, air cooling, and the workpiece hardness is between HB227 and 269; (5) Finish turning: Finish the outer and inner holes of the workpiece in step (4) to a roughness of Ra1.6 μm or more and a flat end surface; (6) Turn the workpiece of step (5) around, align it according to the outer circle, finish-machine the guide section of the inner cavity, flatten the end surface and chamfer it 0.5x45°, and turn the retaining ring groove; (7) Valve body inspection.

2. The processing technology of a high temperature resistant one-way valve according to claim 1, characterized in that: A retaining ring is provided at the gas outlet, and a retaining ring groove matching the retaining ring is provided on the cavity wall of the inner cavity.

3. The processing technology of a high temperature resistant one-way valve according to claim 1, characterized in that: A cover plate is provided on the top of the valve body, and a through hole is provided on the cover plate. The through hole is connected to the gas outlet.

4. The processing technology of a high temperature resistant one-way valve according to claim 1, characterized in that: The sealing body is in the shape of a truncated cone, that is, a frustum, and the inner diameter of the sealing section is between the outer diameters of the upper and lower bottom surfaces of the sealing body.

5. The processing technology of a high temperature resistant one-way valve according to claim 1, characterized in that: The sealing body and the sealing section are matched to form a sealing fit.

6. The processing technology of a high temperature resistant one-way valve according to claim 1, characterized in that: It also includes assembly and pressure testing.

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