Leak-proof structure and gas three-way valve for steel rolling heating furnace

Abstract

The utility model relates to the field of gas three-way valves for steel rolling heating furnaces, and particularly discloses a leakproof structure and a gas three-way valve for a steel rolling heating furnace, which comprise an upper fixing sleeve and a lower fixing sleeve, the upper fixing sleeve and the lower fixing sleeve are both arranged to be of an annular structure, and the inner wall of the lower fixing sleeve comprises a first fixing part and a second fixing part. A first sealing piece is arranged on the inner wall of the second fixing part, the lower fixing sleeve sleeves the outer wall of the upper fixing sleeve through the first fixing part, a second sealing piece is arranged at the end, away from the lower fixing sleeve, of the inner wall of the upper fixing sleeve, a sealing chamber is formed in the inner wall of the upper fixing sleeve, and a vent hole communicated with the sealing chamber is formed in the side wall of the upper fixing sleeve. The vent hole is communicated with a nitrogen source, the first sealing piece and the second sealing piece work together, nitrogen is continuously introduced into the sealing chamber through the vent hole, dynamic purging and sealing of leakage points are achieved, gas leakage can be effectively prevented, and safety is higher.

Description

Technical Field

[0001] The utility model relates to the field of a three-way gas valve for a steel rolling heating furnace, in particular to an anti-leakage structure and a three-way gas valve for a steel rolling heating furnace. Background Art

[0002] The steel rolling heating furnace is a common heat treatment equipment in the steel industry. Its working principle mainly includes two stages: heating and insulation. In the heating stage, the heating furnace heats the billet to a certain temperature by burning fuel or electric heating for subsequent rolling processing. In the insulation stage, the heating furnace will keep the billet within a certain temperature range to ensure uniform heat distribution and stable temperature of the billet. When the billet is heated in a heating furnace fueled by gas, the gas three-way valve is a valve used to control the gas and air, the combustion in the furnace and the exhaust of the combustion flue gas in the furnace. It has three import and export interfaces. The two interconnected interfaces of each valve are used alternately during use, because the burners on both sides of the heating furnace are used alternately, so the three-way valve serves the purpose of alternating intake and exhaust. A gas three-way valve usually includes a valve body, a cylinder, a connecting rod, and a valve cover. The cylinder drives the connecting rod to rise and fall, which in turn drives the valve cover to rise and fall, and the valve plate opens or closes the gas. However, in the existing gas three-way valve, the installation and use of the connecting rod is usually only achieved through a sealing ring, which is easy to cause gas leakage and has low safety.

[0003] The existing patent application number is CN202021874944.9, which is a heat storage steel rolling heating furnace, including a three-way valve. A cylinder is arranged on the top of the valve chamber, and the telescopic rod of the cylinder is provided with an upper valve platform. The cylinder drives the telescopic rod to rise and fall, and then drives the upper valve platform to rise and fall to realize the opening or closing of the gas.

[0004] The above patent does not specify whether a sealing structure is provided at the installation location of the cylinder. During the gas circulation process, the gas is likely to leak from the installation location of the cylinder. In addition, the above patent does not provide a dynamic seal between the outer wall of the telescopic rod and the inner wall of the cylinder, which is also likely to cause gas leakage and has low safety. Utility Model Content

[0005] The utility model provides a leakage prevention structure and a three-way gas valve for a steel rolling heating furnace, so as to solve the technical problems in the prior art that gas leakage is easily caused and the safety is low.

[0006] In order to solve the above problems, the utility model provides an anti-leakage structure and a three-way gas valve for a steel rolling heating furnace, which adopts the following technical solutions: an anti-leakage structure, including an upper fixed sleeve and a lower fixed sleeve, both of which are arranged as an annular structure, the inner wall of the lower fixed sleeve includes a first fixed part and a second fixed part, the inner wall of the second fixed part is provided with a first sealing member, the lower fixed sleeve is sleeved on the outer wall of the upper fixed sleeve through the first fixed part, a second sealing member is provided at one end of the inner wall of the upper fixed sleeve away from the lower fixed sleeve, a sealed chamber is formed on the inner wall of the upper fixed sleeve, a vent hole which is interconnected with the sealed chamber is opened on the side wall of the upper fixed sleeve, and the vent hole is connected to a nitrogen gas source.

[0007] Furthermore, the vent hole is connected to an air inlet pipe, the air inlet pipe is connected to a nitrogen gas source, and a gas source triplex is provided on the air inlet pipe.

[0008] Further, the diameter of the first fixing portion is set to L1, the diameter of the second fixing portion is set to L2, the diameter of the inner wall of the upper fixing sleeve is set to L3, the diameter of the inner wall of the first sealing component is set to L4, and L1>L2>L3>L4.

[0009] Further, a sealing chamber is formed between the first sealing member and the second sealing member.

[0010] Furthermore, the first sealing element is a high temperature resistant fluororubber combined sealing ring.

[0011] Furthermore, the second sealing member is a gland type sealing ring.

[0012] A three-way gas valve for a steel rolling heating furnace includes the above-mentioned anti-leakage structure, and also includes a valve body and a connecting rod. A lower fixed sleeve is fixedly connected to the valve body, and the connecting rod passes through an upper fixed sleeve and a lower fixed sleeve. The outer wall diameter of the connecting rod is smaller than the inner wall diameter of the upper fixed sleeve, and a sealing chamber is formed in the gap between the inner wall of the upper fixed sleeve and the outer wall of the connecting rod.

[0013] Furthermore, the valve body includes a valve cover, a connecting rod is linked to a cylinder for driving the connecting rod to extend and retract, and an end of the connecting rod is fixedly connected to the valve cover.

[0014] The utility model provides a three-way gas valve anti-leakage device for a steel rolling heating furnace, which has the following beneficial effects:

[0015] 1. The first seal and the second seal work together to form an efficient double sealing system. Nitrogen is continuously introduced into the sealing chamber through the vent hole to form a certain pressure in the sealing chamber, thereby realizing dynamic purging and sealing of the leakage point, which can effectively prevent gas leakage and is safer;

[0016] 2. As an inert gas, nitrogen not only does not react chemically with gas or other media, but also effectively inhibits the formation of explosive mixtures, making it safer;

[0017] 3. As the connecting rod moves, the nitrogen purge mechanism can work continuously to ensure that the nitrogen pressure in the sealing chamber is always higher than the external medium pressure, thereby achieving a dynamic sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of a gas three-way valve anti-leakage device for a steel rolling heating furnace according to the utility model;

[0020] Figure 2 The utility model is a schematic structural diagram of the anti-leakage structure of a gas three-way valve anti-leakage device for a steel rolling heating furnace.

[0021] Description of reference numerals:

[0022] 1. Upper fixing sleeve; 11. Second sealing member; 12. Sealing chamber; 13. Vent hole; 131. Air inlet pipe; 132. Air source triplex; 14. First connecting part; 15. Connecting pin; 2. Lower fixing sleeve; 21. First fixing part; 22. Second fixing part; 221. Receiving part; 23. First sealing member; 24. Second connecting part; 3. Valve body; 31. Valve cover; 32. Cylinder; 4. Connecting rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0024] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0025] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0026] The utility model provides a leakage prevention structure and a three-way gas valve for a steel rolling heating furnace, such as Figure 1 to Figure 2As shown, a leakage-proof structure comprises an upper fixed sleeve 1 and a lower fixed sleeve 2, both of which are arranged as an annular structure, the inner wall of the lower fixed sleeve 2 comprises a first fixed portion 21 and a second fixed portion 22, the inner wall of the second fixed portion 22 is provided with a first sealing member 23, the lower fixed sleeve 2 is sleeved on the outer wall of the upper fixed sleeve 1 through the first fixed portion 21, a second sealing member 11 is provided at one end of the inner wall of the upper fixed sleeve 1 away from the lower fixed sleeve 2, a sealed chamber 12 is formed on the inner wall of the upper fixed sleeve 1, a vent hole 13 which is interconnected with the sealed chamber 12 is opened on the side wall of the upper fixed sleeve 1, and the vent hole 13 is connected to a nitrogen gas source.

[0027] A three-way gas valve for a steel rolling heating furnace includes the above-mentioned anti-leakage structure, and also includes a valve body 3 and a connecting rod 4. The lower fixed sleeve 2 is fixedly connected to the valve body 3, and the connecting rod 4 passes through the upper fixed sleeve 1 and the lower fixed sleeve 2. The outer wall diameter of the connecting rod 4 is smaller than the inner wall diameter of the upper fixed sleeve 1, and the sealing chamber 12 is formed in the gap between the inner wall of the upper fixed sleeve 1 and the outer wall of the connecting rod 4.

[0028] In this embodiment, the upper fixing sleeve 1 and the lower fixing sleeve 2 are tightly connected by a sleeve connection, wherein a first sealing member 23 is provided on the inner wall of the second fixing portion 22 of the lower fixing sleeve 2. When the connecting rod 4 passes through the upper fixing sleeve 1, a first seal is formed between the first sealing member 23 and the outer wall of the connecting rod 4. At the same time, a second sealing member 11 is provided on the end of the inner wall of the upper fixing sleeve 1 away from the lower fixing sleeve 2. When the connecting rod 4 passes through the upper fixing sleeve 1, a second seal is formed between the second sealing member 11 and the outer wall of the connecting rod 4. The first sealing member 23 and the second sealing member 11 work together to form an efficient double sealing system.

[0029] In the present embodiment, the sealed chamber 12 is formed in the gap between the inner wall of the upper fixed sleeve 1 and the outer wall of the connecting rod 4, and the sealed chamber 12 is formed between the first sealing member 23 and the second sealing member 11, that is, the sealed chamber 12 is a chamber formed by the inner wall of the upper fixed sleeve 1, the outer wall of the connecting rod 4, the first sealing member 23, and the second sealing member 11. In the present embodiment, nitrogen is continuously introduced into the sealed chamber 12 through the vent 13 to form a certain pressure in the sealed chamber 12, thereby realizing dynamic purging and sealing of the leakage point, which can effectively prevent gas leakage and has higher safety. Moreover, as the connecting rod 4 moves, the nitrogen purging mechanism can continue to work to ensure that the nitrogen pressure in the sealed chamber 12 is always higher than the external medium pressure, thereby achieving a dynamic sealing effect.

[0030] In this embodiment, the double sealing design and nitrogen purge mechanism can effectively improve the sealing performance of the gas three-way valve, can effectively reduce the risk of gas leakage, improve the stability and reliability of the system, and have higher safety. It should be noted that the gas pressure in the gas three-way valve is usually up to 20KPa. In this embodiment, the nitrogen gas source is adjusted to 40KPa. Once there is a gas leak, the nitrogen can seal the gas in the gas three-way valve. Nitrogen, as an inert gas, not only does not chemically react with gas or other media, but also effectively inhibits the formation of explosive mixtures, which is safer.

[0031] In this embodiment, a first connecting portion 14 is provided on the side wall of the upper fixing sleeve 1, and a second connecting portion 24 is provided on the side wall of the lower fixing sleeve 2. A connecting pin 15 is installed on the first connecting portion 14, and the connecting pin 15 passes through the first connecting portion 14 and is fixedly connected with the second connecting portion 24 to achieve a fixed connection between the upper fixing sleeve 1 and the lower fixing sleeve 2.

[0032] In this embodiment, the vent hole 13 is connected to an air inlet pipe 131, and the air inlet pipe 131 is connected to a nitrogen gas source. An air source triplex 132 is provided on the air inlet pipe 131 to achieve the effects of purifying, reducing pressure and lubricating the nitrogen gas source.

[0033] It should be noted that the air source triplex 132 is a prior art. The three air source processing components, namely, the air filter, the pressure reducing valve and the oil mist collector, are assembled together to form a pneumatic triplex, that is, the air source triplex 132, which is used to purify and filter the air source and reduce the pressure to the rated air source pressure supplied to the instrument, which is equivalent to the function of the power transformer in the circuit. Those skilled in the art should be aware of its structure, principle and usage, etc., which will not be described in detail here.

[0034] In this embodiment, the air source triplet 132 lubricates the connecting rod 4 and the anti-leakage structure through an oil mist device. The mist lubricating oil sprayed by the oil mist device can be evenly adhered to the surface of the connecting rod 4 shaft and the anti-leakage structure to form a thin oil film. The oil film can reduce the direct contact between metal parts and reduce the friction coefficient, thereby reducing wear and heat generation, which can significantly extend the service life of the parts and improve the reliability and stability of the entire system.

[0035] In this embodiment, the diameter of the first fixing portion 21 is set to L1, the diameter of the second fixing portion 22 is set to L2, the diameter of the inner wall of the upper fixing sleeve 1 is set to L3, and the diameter of the inner wall of the first sealing member 23 is set to L4, L1>L2>L3>L4. In this embodiment, through reasonable diameter setting, the tight fit between the connecting rod 4 and the first sealing member 23, the upper fixing sleeve 1, and the lower fixing sleeve 2 is ensured, thereby improving the sealing performance. The setting of L1 and L2 ensures a firm connection between the lower fixing sleeve 2 and the upper fixing sleeve 1, ensures accurate positioning and support of the upper fixing sleeve 1 installed in the lower fixing sleeve 2, and helps to enhance the stability and reliability of the entire structure. The setting of L3 takes into account the demand for nitrogen circulation, ensuring that nitrogen can smoothly enter the sealing chamber 12 and maintain its pressure stability.

[0036] In this embodiment, the first seal 23 is a high-temperature resistant fluororubber combination seal ring. In a high-temperature environment, the first seal 23 can maintain good elasticity and sealing performance, and is not easy to age, harden or crack. The first seal 23 has excellent corrosion resistance and aging resistance, and also has good electrical insulation, ozone resistance and weather resistance. In this embodiment, a receiving portion 221 is provided at one end of the second fixing portion 22 away from the first fixing portion 21. The diameter of the receiving portion 221 is smaller than the diameter of the second fixing portion 22, and is used to receive the first seal 23 to maintain the stability of the first seal 23 installed on the lower fixing sleeve 2.

[0037] In this embodiment, the second sealing member 11 is a gland-type sealing ring, which forms an effective sealing interface through the compression of the gland on the sealing ring, thereby effectively preventing leakage of the medium.

[0038] In this embodiment, the valve body 3 includes a valve cover 31, and the connecting rod 4 is linked to a cylinder 32 for driving the connecting rod 4 to extend and retract. The end of the connecting rod 4 is fixedly connected to the valve cover 31. In this embodiment, the gas three-way valve drives the connecting rod 4 through the cylinder 32, and the connecting rod 4 drives the valve plate to rise and fall, so that the valve plate opens or closes the gas, thereby realizing the given combustion of the gas in the heating furnace.

[0039] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and other terms indicating orientation or position relationship are based on the orientation or position relationship shown in the drawings of this specification, which are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0040] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A leakage prevention structure, characterized in that: It includes an upper fixed sleeve and a lower fixed sleeve, both of which are arranged as an annular structure, the inner wall of the lower fixed sleeve includes a first fixed part and a second fixed part, the inner wall of the second fixed part is provided with a first sealing member, the lower fixed sleeve is sleeved on the outer wall of the upper fixed sleeve through the first fixed part, a second sealing member is provided at one end of the inner wall of the upper fixed sleeve away from the lower fixed sleeve, a sealed chamber is formed on the inner wall of the upper fixed sleeve, a vent hole connected to the sealed chamber is opened on the side wall of the upper fixed sleeve, and the vent hole is connected to a nitrogen gas source.

2. The anti-leakage structure according to claim 1, characterized in that: The vent hole is connected with an air inlet pipe, the air inlet pipe is connected with a nitrogen gas source, and a gas source triplet is arranged on the air inlet pipe.

3. The anti-leakage structure according to claim 1, characterized in that: The diameter of the first fixing part is set to L1, the diameter of the second fixing part is set to L2, the diameter of the inner wall of the upper fixing sleeve is set to L3, and the diameter of the inner wall of the first sealing component is set to L4, L1>L2>L3>L4.

4. The anti-leakage structure according to claim 3, characterized in that: A sealing chamber is formed between the first sealing member and the second sealing member.

5. The anti-leakage structure according to claim 4, characterized in that: The first sealing element is a high temperature resistant fluororubber combined sealing ring.

6. The anti-leakage structure according to claim 4, characterized in that: The second sealing member is a gland type sealing ring.

7. A three-way gas valve for a steel rolling heating furnace, characterized in that: It includes an anti-leakage structure as described in any one of claims 1 to 6, and also includes a valve body and a connecting rod. The lower fixed sleeve is fixedly connected to the valve body, the connecting rod passes through the upper fixed sleeve and the lower fixed sleeve, the outer wall diameter of the connecting rod is smaller than the inner wall diameter of the upper fixed sleeve, and the sealing chamber is formed in the gap between the inner wall of the upper fixed sleeve and the outer wall of the connecting rod.

8. A three-way gas valve for a steel rolling heating furnace according to claim 7, characterized in that: The valve body comprises a valve cover, a connecting rod is linked to a cylinder for driving the connecting rod to extend and retract, and the end of the connecting rod is fixedly connected to the valve cover.

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