A two-way valve for protecting gas leakage in holding furnace

Abstract

The present invention discloses a two-way valve for gas leakage protection of a heat preservation furnace, including a gland, a sealing ring, a support, a base, a guide screw and a spring. When working, the high-pressure gas in the closed chamber is used to drive the gland with a sealing ring embedded on the bottom surface to be close to the end surface of the support to achieve a closed seal. In the non-working state, the gland is lifted away from the support under the action of the spring elastic force, that is, it returns to the open state, and the condensed water will flow downward along the gap between the outer surface of the gland and the blind hole in the support and be discharged through the first through hole. The present invention makes full use of the conditions of the heat preservation furnace of the differential pressure casting equipment in the working and non-working states, so that the gas leakage protection two-way valve has a simple structure and reliable sealing and drainage functions. It works automatically after one installation and can adapt to high temperature environments. In particular, the gas high-pressure double-acting self-sealing technology ensures reliable sealing and timely drainage, which can ensure the normal operation of the heat preservation furnace and improve the casting quality of the workpiece.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a two-way valve for protecting gas leakage of a heat preservation furnace. Background Art

[0002] At present, in differential pressure casting equipment, the holding furnace is a carrier for the insulation and transportation of alloy melt, and its safe and reliable operation is particularly important for the smooth progress of casting. The holding furnace has an insulation function, with heating resistors arranged inside and an external 380V three-phase power supply. The interface connecting the three-phase power cable and the heating resistor is located in a closed chamber fixedly connected to the main body of the holding furnace. During differential pressure casting, high-temperature and high-pressure gas enters the closed chamber of the three-phase electrical interface, and condenses into water droplets due to the decrease in temperature. When the water droplets accumulate to submerge the three-phase electrical connector, a circuit short circuit fault will occur, damaging the equipment and even causing personal injury.

[0003] The current solution is to add a ball valve at the bottom of the closed chamber of the three-phase electrical interface, open the ball valve at intervals in the non-working state to drain the condensed water inside, and then close the ball valve. However, it is difficult to accurately control manual operation, and errors are inevitable; and the working environment temperature reaches 70~100℃, and the sealing of ordinary ball valves is poor, resulting in gas leakage and affecting the casting quality. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a gas leakage protection two-way valve for an insulation furnace, so that the closed chamber of the three-phase electrical interface of the insulation furnace can be automatically sealed when working, and the condensed water can be automatically drained in the non-working state.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A two-way valve for protecting gas leakage of a heat preservation furnace, comprising a gland, a sealing ring, a support, a base, a guide post screw and a spring; the support is sealed and fixed on the cavity wall at the bottom of a closed chamber of the heat preservation furnace, and a blind hole is provided on the support; the gland is located above the support, and the gland is located inside the closed chamber, and a sealing ring is inlaid on the bottom surface of the gland; the base is fixedly connected to the bottom of the support, and the base is located outside the closed chamber, and a first through hole connected to the blind hole is provided on the base; the gland is connected to the base by a guide post screw, and the gland is connected to the guide post screw. The column screws are slidingly fitted together; the bottom end of the spring is supported on the bottom of the blind hole, and the top end of the spring is supported on the bottom surface of the gland; in the non-working state, the pressure in the closed chamber is normal pressure, at this time the gland is supported by the spring relative to the support, the gland is in an open state, and condensed water flows down along the gap between the gland and the support and is discharged through the first through hole; in the working state, the high-pressure gas in the closed chamber presses the gland downward along the guide column screws to the top surface of the support, the gland is in a closed state, and the sealing ring contacts the top surface of the support to achieve sealing of the high-pressure gas in the closed chamber.

[0007] The bottom surface of the gland is provided with an annular dovetail groove, and an O-shaped sealing ring is embedded in the dovetail groove.

[0008] The opening angle of the dovetail groove is 30°.

[0009] A plurality of second through holes are evenly arranged on the top of the dovetail groove along its circumference.

[0010] The material of the gland is aluminum.

[0011] The sealing ring is made of silicone rubber.

[0012] The present invention has the following beneficial effects:

[0013] The gas leakage protection two-way valve for the insulation furnace provided by the present invention, when working, uses the high-pressure gas in the closed chamber to drive the actuator cover to be close to the end face of the support to achieve a closed seal, and the bottom surface of the cover is inlaid with a sealing ring to achieve the sealing of the high-pressure gas in the closed chamber. In the non-working state, the actuator cover is lifted away from the support under the action of the spring elastic force, that is, it returns to the open state, and the condensed water will flow downward along the gap between the outer surface of the cover and the blind hole in the support and be discharged through the first through hole. The present invention makes full use of the conditions of the insulation furnace of the differential pressure casting equipment in the working and non-working states, so that the gas leakage protection two-way valve has a simple structure and reliable sealing and drainage functions. It works automatically after one installation and can adapt to high temperature environments. In particular, the gas high-pressure double-acting self-sealing technology ensures reliable sealing and timely drainage, which can ensure the normal operation of the insulation furnace and improve the casting quality of the workpiece.

[0014] Furthermore, the present invention reserves a dovetail groove with an angle of 30° at the bottom of the gland, and the sealing ring can be embedded in the dovetail groove without falling off. A second through hole is provided at the top of the dovetail groove, and the high-pressure gas acts on the sealing ring through the second through hole reserved in the gland, further making the sealing ring and the end face of the support close and tight, achieving secondary sealing and improving the sealing performance. The gland is made of aluminum, which can not only reduce its weight and the stiffness of the spring, but also ensure a certain rigidity, so that the gas leakage protection two-way valve of the present invention is sensitive to response. The sealing ring is made of high-temperature resistant silicone material, which can maintain good sealing performance at higher working temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0016] In the attached picture:

[0017] Figure 1 It is a schematic diagram of the overall structure of the holding furnace;

[0018] Figure 2 yes Figure 1 The partial enlarged view at I in the middle is a cross-sectional view of a gas leakage protection two-way valve for a heat preservation furnace provided by the present invention;

[0019] In the figure, 1 is the insulation furnace body, 2 is the closed chamber, 3 is the cable interface, 4 is the gas leakage protection two-way valve for the insulation furnace of the present invention, 5 is the pressure cover, 6 is the sealing ring, 7 is the guide column screw, 8 is the spring, 9 is the support, 10 is the base, 11 is the drainage hole, 12 is the blind hole, 13 is the dovetail groove, and 14 is the through hole. DETAILED DESCRIPTION

[0020] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1 To Attachment Figure 2 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0021] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0022] The gas leakage protection two-way valve for a heat preservation furnace provided by the present invention mainly solves the function of automatically sealing the closed chamber of the three-phase electrical interface of the heat preservation furnace when working and automatically draining condensed water in a non-working state.

[0023] like Figure 1 As shown, the insulation furnace body 1 is a carrier of the crucible and the molten metal, and the closed chamber 2 is an integrated structure with the insulation furnace body 1, providing a closed space for the connection of the resistance wire in the insulation furnace and the external cable. The cable interface 3 is an interface of the three-phase electricity, which is at the bottom. If the condensed water first overflows here, it will cause a short circuit.

[0024] like Figure 2 As shown, the gas leakage protection two-way valve for the insulation furnace of the present invention is composed of the basic parts of the gland 5, the support 9 and the base 10, and the standard parts of the sealing ring 6, the guide pin screw 7 and the spring 8. The support 9 is sealed and fixed on the cavity wall at the bottom of the closed chamber 2 of the insulation furnace; the gland 5 is located above the support 9, and the gland 5 is located inside the closed chamber 2; the base 10 is fixedly connected to the bottom of the support 9, and the base 10 is located outside the closed chamber 2 and connected to the atmosphere. The gland 5 is connected to the base 10 through the guide pin screw 7, and the gland 5 and the guide pin screw 7 are slidably matched. A blind hole 12 is provided on the support 9. The bottom end of the spring 8 is supported on the bottom of the blind hole 12, and the top end of the spring 8 is supported on the bottom surface of the gland 5. A first through hole 11 connected to the blind hole 12 is provided on the base 10. A 30° annular dovetail groove 13 is formed on the bottom surface of the gland 5; an O-shaped sealing ring 6 is embedded in the dovetail groove 13; and a plurality of second through holes 14 are evenly formed on the top of the dovetail groove 13 along its circumference.

[0025] The working principle of the present invention is as follows.

[0026] When the insulation furnace is not in operation, there is no high-pressure gas inside the insulation furnace body 1 and the closed chamber 2. The inside of the two is connected to the outside atmosphere, that is, the pressure is equal to the atmospheric pressure. The gland 5 is connected to the base 10 through the guide screw 7. The gland 5 and the guide screw 7 are in sliding fit. At this time, the gland 5 moves downward along the guide screw 7 under the action of gravity. The bottom end of the spring 8 is supported on the bottom of the blind hole of the support 9, and the top end is supported on the bottom surface of the gland 5. The gland 5 is supported by the spring 8 relative to the support 9 and is in an open state. In this way, the condensed water will flow down along the gap formed by the outer cylindrical surface of the gland 5 and the surface of the blind hole of the support 9, and be discharged through the first through hole 11 reserved on the base 10 at the bottom of the blind hole 12.

[0027] When the holding furnace is in operation, the holding furnace body 1 and the sealed chamber 2 are filled with high-pressure gas, and the internal pressure of both is 6 bar, which is 1 bar higher than the external atmospheric pressure. The upper and lower surfaces of the gland 5 flange are subjected to the same air pressure, but the pressure action area of ​​the upper surface is larger than the pressure action area of ​​the lower surface, thus generating a pressure difference, which overcomes the elastic force of the spring 8, causing the gland 5 to move downward along the guide screw 7 until the bottom surface of the gland 5 flange contacts the top surface of the support 9, at which time the gland 5 is in a closed state.

[0028] In order to ensure the sealing of the high-pressure gas in the closed chamber 2 under the working state, the sealing ring 6 embedded in the bottom surface of the flange of the pressure cover 5 contacts the top surface of the support 9 to achieve a primary seal. At the same time, the top of the dovetail groove 13 is evenly distributed with second through holes 14 along its circumference. The high-pressure gas presses the sealing ring 6 through the second through holes 14, so that the sealing ring 6 and the end surface of the support 9 are tightly attached to achieve a secondary seal. This is the gas high-pressure double-acting self-sealing technology. The two high-pressure actions achieve a reliable seal for the high-pressure gas in the closed chamber 2.

[0029] In addition, the present invention adopts sealing ring embedding anti-detachment technology, that is, a 30° dovetail groove 13 is opened on the bottom surface of the gland 5, and the O-ring 6 is embedded in the dovetail groove, which can prevent the sealing ring 6 from falling off when the gland 5 is pushed upward by the spring 8.

[0030] Because the holding furnace has a high working temperature and emits more heat to the outside, the sealing ring 6 is made of silicone rubber, which is not only resistant to high temperatures but also has good elasticity.

[0031] In order to make the gas leakage protection two-way valve for the insulation furnace of the present invention responsive and reduce the stiffness of the spring 8 as much as possible, the weight of the actuator cover 5 should be reduced, while ensuring that the cover 5 has a certain rigidity, so aluminum is selected to manufacture the cover 5.

[0032] The present invention makes full use of the conditions of the holding furnace of the differential pressure casting equipment in the working and non-working states, so that the gas leakage protection two-way valve has a simple structure and reliable sealing and drainage functions. It works automatically after one installation and can adapt to high temperature environments. In particular, the gas high-pressure double-acting self-sealing technology ensures reliable sealing and timely drainage, which can ensure the normal operation of the holding furnace and improve the casting quality of the workpiece.

[0033] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A two-way valve for gas leakage protection of a holding furnace, characterized in that: The invention comprises a gland (5), a sealing ring (6), a support (9), a base (10), a guide post screw (7) and a spring (8); the support (9) is sealed and fixed on the cavity wall at the bottom of the closed chamber (2) of the heat preservation furnace, and a blind hole (12) is provided on the support (9); the gland (5) is located above the support (9), and the gland (5) is located inside the closed chamber (2), and the bottom surface of the gland (5) is inlaid with a sealing ring (6); the base (10) is fixedly connected to the bottom of the support (9), and the base (10) is located outside the closed chamber (2), and a first through hole (11) connected to the blind hole (12) is provided on the base (10); the gland (5) is connected to the base (10) by the guide post screw (7), and the gland (5) and the guide post screw (7) are slidably matched; the bottom end of the spring (8) is supported on the bottom of the blind hole (12), and the top end of the spring (8) is supported on the bottom surface of the gland (5); the closed chamber (2) is provided in a non-working state. The pressure in the chamber (2) is normal pressure. At this time, the gland (5) is supported by the spring (8) relative to the support (9). The gland (5) is in an open state. Condensed water flows down along the gap between the gland (5) and the support (9) and is discharged through the first through hole (11). In the working state, the high-pressure gas in the closed chamber (2) presses the gland (5) downward along the guide screw (7) onto the top surface of the support (9). The gland (5) is in a closed state. The sealing ring (6) is in contact with the support (9). The top surface of the seat (9) is in contact with the high-pressure gas in the closed chamber (2) to achieve sealing; the bottom surface of the gland (5) is provided with an annular dovetail groove (13), and an O-shaped sealing ring (6) is embedded in the dovetail groove (13); the opening angle of the dovetail groove (13) is 30°; the top of the dovetail groove (13) is evenly provided with a plurality of second through holes (14) along its circumference; the gland (5) is made of aluminum; and the sealing ring (6) is made of silicone rubber.

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