High-pressure gas sealing device of gas three-way valve

Abstract

The utility model discloses a high-pressure gas sealing device of a gas three-way valve, which relates to the technical field of valve body sealing, is used for sealing between a heating furnace body and a connecting rod, and comprises a sealing sleeve and a main sealing ring which are sleeved on the connecting rod from inside to outside; the sealing sleeve is provided with an inner sleeve cavity matched with the outer diameter of the connecting rod, an air hole channel communicated with the inner sleeve cavity in the radial direction from the outer circumferential face of the sealing sleeve is formed in the waist portion of the sealing sleeve, the main sealing ring is provided with an air inlet formed in the radial direction, and the air inlet is communicated with the air hole channel. Active high-pressure gas is adopted for sealing, meanwhile, the replacement process of the sealing device is simplified, time and labor are saved, and production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve body sealing, in particular to a high-pressure gas sealing device for a gas three-way valve. Background Art

[0002] The gas three-way valve is a device that controls the on and off of gas (main component: CO). Due to the use environment and the aging of the equipment itself, the three-way valve will leak gas from the connecting rod and the seal after a period of use, causing casualties and posing a huge safety hazard. The gas risk in the heating furnace area mainly comes from the leakage of the three-way valve.

[0003] Since the three-way valve is a key component of the heating furnace, if you want to repair or replace this sealing device, you have to shut down the furnace or wait until it is overhauled. Replacing it is also very time-consuming and laborious, with small space, many disassembled parts, and high technical difficulty. Even if the newly replaced sealing device is used for a short time, it will often cause leakage problems again, which is very inconvenient.

[0004] The current sealing method is mainly passive micro-air pressure sealing, that is, there is micro-air pressure between the rubber sealing ring and the connecting rod, which has low resistance to the invasion of external dust, easily causes wear of the connecting rod, and increases the leakage process of the sealing pair. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a high-pressure gas sealing device for a gas three-way valve, which changes the form of the sealing structure and cooperates with active high-pressure gas for sealing. At the same time, it simplifies the replacement process of the sealing structure, saves time and effort, and is conducive to improving production efficiency.

[0006] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a high-pressure gas sealing device for a three-way gas valve, which is used for sealing between a heating furnace body and a connecting rod, and comprises a sealing sleeve and a main sealing ring which are arranged on the connecting rod from the inside to the outside;

[0008] The sealing sleeve has an inner sleeve cavity matched with the outer diameter of the connecting rod, and also has a shoulder portion protruding toward the main sealing ring, and an air hole channel radially connected to the inner sleeve cavity from the outer peripheral surface of the sealing sleeve is opened at the waist of the sealing sleeve, and sealing ring grooves for filling the main seal are respectively opened in the upper half and the lower half of the inner sleeve cavity, and the main seal is tightly assembled between the sealing ring groove and the connecting rod;

[0009] The upper part of the main sealing ring has a supporting platform that cooperates with the shoulder part, and also has a gas inlet opened along the radial direction. The gas inlet is connected to the air hole channel. The supporting platform and the shoulder part are tightly assembled and fixed through corresponding bolt holes. The lower part of the main sealing ring is leveled and welded to the heating furnace body.

[0010] As a preferred solution of the utility model, at least one pair of air hole channels are provided and are evenly opened along the radial direction of the sealing sleeve.

[0011] As a preferred solution of the utility model, the sealing sleeve is provided with an annular collecting groove inwardly at the waist position where the air hole channel is provided, and the high-pressure gas is injected into the air hole channel through the collecting groove.

[0012] As a preferred embodiment of the utility model, it also includes an upper support cover and a lower support ring, wherein the lower support ring is tightly assembled between the bottom of the sealing sleeve and the connecting rod to radially support the matching gap between the bottom of the sealing sleeve and the main sealing ring; the upper support cover has a center hole for sleeve-fitting the connecting rod, and the outer edge of the upper support cover is threadedly connected to the upper part of the main sealing ring to radially support the matching between the main sealing ring and the connecting rod.

[0013] As a preferred solution of the utility model, an upper sealing ring is provided at the matching gap between the shoulder portion and the supporting platform toward the sealing sleeve and the main sealing ring;

[0014] A lower sealing ring is arranged at the matching gap between the sealing sleeve and the lower part of the main sealing ring.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] Firstly, the utility model changes the structure of the sealing device, improves the original passive micro-pressure sealing structure into an active high-pressure gas sealing structure, and enhances the normalized sealing performance of the structure;

[0017] Secondly, the active high-pressure gas seal can isolate external pollutants such as particles and dust from the sealing structure, thereby reducing the possibility of pollutants entering the sealing gap and reducing the wear between the connecting rod and the sealing device;

[0018] Moreover, after adopting active high-pressure gas sealing, even if the sealing structure has problems of wear and leakage, the high-pressure gas will push the gas back, and the problem of gas leakage into the atmosphere will not occur, thus ensuring production safety; and when the sealing structure is worn, the pressure at the high-pressure gas output port will change, and the staff can be informed of the wear status in time, so as to replace the seal in time.

[0019] Finally, the sealing structure adopted by the utility model has the effect of simple replacement, saving time and labor, and helping to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a structural schematic diagram of a high-pressure gas sealing device of a three-way gas valve.

[0021] Figure 2 for Figure 1 A magnified view of the local structure at point A.

[0022] Figure 3 for Figure 1 Structural explosion diagram of the sealing device in .

[0023] Figure 4 The figure is a sealing structure diagram of a gas three-way valve in the prior art.

[0024] Figure 5 for Figure 4 Schematic diagram of the local structure at point B.

[0025] in:

[0026] 100. Heating the furnace body;

[0027] 200, connecting rod;

[0028] 300, sealing sleeve, 310, inner sleeve cavity, 320, shoulder portion, 330, air hole channel, 340, sealing ring groove, 350, collecting groove;

[0029] 400, main sealing ring, 410, supporting platform, 420, gas inlet, 430, bolt hole position, 440, upper sealing ring, 450, lower sealing ring;

[0030] 500, main seal;

[0031] 600, upper support cover, 610, center hole;

[0032] 700, lower support ring;

[0033] 810, upper support, 820, main ring body, 830, inner sleeve body, 840, rubber sealing ring, 850, lower support. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] like Figure 4 and Figure 5 As shown, a sealing structure B is provided between the heating furnace body 100 and the connecting rod 200 to prevent the gas in the heating furnace body 100 from leaking into the atmosphere when the connecting rod 200 moves. The sealing structure B includes an upper support 810, a main ring body 820, an inner sleeve body 830, a rubber sealing ring 840, and a lower support 850. There is a micro-air pressure between the rubber sealing ring 840 and the connecting rod 200, and the resistance to the invasion of external dust is low, which can easily cause the connecting rod to wear and the failure of the sealing structure.

[0036] In the utility model, Figures 1 to 3 A high-pressure gas sealing device of a three-way gas valve is shown, which is used for sealing between a heating furnace body 100 and a connecting rod 200, and comprises a sealing sleeve 300 and a main sealing ring 400 which are arranged on the connecting rod 200 from the inside to the outside;

[0037] The sealing sleeve 300 has an inner sleeve cavity 310 matched with the outer diameter of the connecting rod 200, and also has a shoulder portion 320 protruding toward the main sealing ring 400, and an air hole channel 330 is opened at the waist of the sealing sleeve 300, which is radially connected to the inner sleeve cavity 310 from the outer peripheral surface of the sealing sleeve 300, and a sealing ring groove 340 for filling the main seal 500 is respectively opened in the upper half and the lower half of the inner sleeve cavity 310, and the main seal 500 is tightly assembled between the sealing ring groove 340 and the connecting rod 200;

[0038] The upper part of the main sealing ring 400 has a supporting platform 410 that cooperates with the shoulder part 320, and also has a gas inlet 420 opened along the radial direction. The gas inlet 420 is connected to the air hole channel 330. The supporting platform 410 and the shoulder part 320 are tightly assembled and fixed through corresponding bolt holes 430. The lower part of the main sealing ring 400 is leveled and welded to the heating furnace body 100.

[0039] contrast Figure 5 and Figure 2 As shown, since the prior art has a poor fit between the micro-air pressure seal and the connecting rod 200, external dust can easily invade and cause sealing defects. The high-pressure gas sealing structure adopted in the utility model introduces high-pressure gas through the air hole channel 300 and supports the main seal 500 upward and downward at the same time, thereby providing the main seal 500 with resistance to external dust, thereby reducing the wear of the connecting rod 200 and the main seal 500.

[0040] Furthermore, even if the main seal 500 is worn and the seal fails, the gas in the heating furnace body 100 will be pushed back into the heating furnace body 100 under the action of the high-pressure gas, thereby avoiding the leakage of toxic gases and ensuring production safety.

[0041] It can be imagined that the utility model sets a device such as a pipeline pressure alarm (not shown in the figure) in the introduction channel of the high-pressure gas, which can give a timely alarm when the sealing structure releases pressure, thereby improving the maintenance efficiency and reducing the maintenance cost, and can also ensure the safety of the production process.

[0042] In addition, the sealing device in the utility model is also conducive to quickly replacing the existing micro-air pressure sealing structure during shutdown and maintenance, shortening the maintenance time, and the main seal 500 used in the sealing device of the utility model is smaller in size and has lower loss, which is conducive to reducing production costs under long-term use.

[0043] It is worth noting that at least one pair of air hole channels 330 are provided and are evenly opened along the radial direction of the sealing sleeve 300, so that the main seal 500 can be evenly pressurized when high-pressure gas acts, avoiding wear problems caused by local uneven pressure and improving air tightness.

[0044] Combination Figure 2 As shown, further, the sealing sleeve 300 is provided with an annular collecting groove 350 inwardly at the waist position where the air hole channel 330 is set, and the high-pressure gas is injected into the air hole channel 330 through the collecting groove 350. The high-pressure gas is introduced into multiple pairs of air hole channels 330 by using the collecting groove 350, which can further average the airflow pressure and avoid the above-mentioned pressure unevenness problem. The structure is simple, and only one gas inlet 420 needs to be set for input, which is convenient for inspection and maintenance.

[0045] In this embodiment, the sealing device also includes an upper support cover 600 and a lower support ring 700, wherein the lower support ring 700 is tightly assembled between the bottom of the sealing sleeve 300 and the connecting rod 200 to radially support the matching gap between the bottom of the sealing sleeve 300 and the main sealing ring 400, so that the lower support ring 700 can provide radial supporting force to the bottom of the sealing sleeve 300, avoid shaking of the bottom of the sealing sleeve 300, and strengthen the sealing effect.

[0046] Although the bottom of the main sealing ring 400 is welded and fixed after leveling, in order to further ensure the stability of the main sealing ring 400 and prevent the sealing device from being invaded by dust, the upper support cover 600 has a center hole 610 for sleeved on the connecting rod 200, and the outer edge of the upper support cover 600 is threadedly connected to the upper part of the main sealing ring 400 to radially support the cooperation between the main sealing ring 400 and the connecting rod 200.

[0047] In order to enhance the sealing performance of the sealing device itself, an upper sealing ring 440 is provided at the matching gap between the shoulder portion 320 and the supporting platform 410 toward the sealing sleeve 300 and the main sealing ring 400; a lower sealing ring 450 is provided at the lower matching gap between the sealing sleeve 300 and the main sealing ring 400.

[0048] Therefore, the self-sealing property of the sealing device is further ensured through the cooperation of the upper sealing ring 440 and the lower sealing ring 450 , and at the same time, the high-pressure gas can further enhance its self-sealing effect through the assembly gap.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high-pressure gas sealing device for a three-way gas valve, used for sealing between a heating furnace body and a connecting rod, characterized in that: It includes a sealing sleeve and a main sealing ring which are arranged on the connecting rod from the inside to the outside; The sealing sleeve has an inner sleeve cavity matched with the outer diameter of the connecting rod, and also has a shoulder portion protruding toward the main sealing ring, and an air hole channel radially connected to the inner sleeve cavity from the outer peripheral surface of the sealing sleeve is opened at the waist of the sealing sleeve, and sealing ring grooves for filling the main seal are respectively opened in the upper half and the lower half of the inner sleeve cavity, and the main seal is tightly assembled between the sealing ring groove and the connecting rod; The upper part of the main sealing ring has a supporting platform that cooperates with the shoulder part, and also has a gas inlet opened along the radial direction. The gas inlet is connected to the air hole channel. The supporting platform and the shoulder part are tightly assembled and fixed through corresponding bolt holes. The lower part of the main sealing ring is leveled and welded to the heating furnace body.

2. The high-pressure gas sealing device for a three-way gas valve according to claim 1, characterized in that: At least one pair of air hole channels are provided and are evenly opened along the radial direction of the sealing sleeve.

3. The high-pressure gas sealing device for a three-way gas valve according to claim 2, characterized in that: The sealing sleeve is provided with an annular collecting groove inwardly at the waist position where the air hole channel is arranged, and the high-pressure gas is injected into the air hole channel through the collecting groove.

4. The high-pressure gas sealing device for a three-way gas valve according to claim 1, characterized in that: It also includes an upper support cover and a lower support ring, wherein the lower support ring is tightly assembled between the bottom of the sealing sleeve and the connecting rod to radially support the matching gap between the bottom of the sealing sleeve and the main sealing ring; the upper support cover has a center hole for sleeve-fitting the connecting rod, and the outer edge of the upper support cover is threadedly connected to the upper part of the main sealing ring to radially support the matching between the main sealing ring and the connecting rod.

5. The high-pressure gas sealing device for a three-way gas valve according to claim 1, characterized in that: An upper sealing ring is arranged at the matching gap between the shoulder portion and the supporting platform toward the sealing sleeve and the main sealing ring; A lower sealing ring is arranged at the matching gap between the sealing sleeve and the lower part of the main sealing ring.

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