Detachable intake and exhaust switching valve structure

Abstract

The utility model discloses detachable intake and exhaust switching valve structure, including poppet valve box body, the parallel setting of poppet valve box body is provided with upper baffle and lower baffle, and two baffle divide the poppet valve box body cavity from top to bottom into upper air flue, intermediate common air flue and lower air flue, and the poppet valve box body top is provided with the air inlet and exhaust through -hole, and the air inlet and exhaust through -hole are all fixed with switching assembly, and the poppet valve box body one side is provided with the overhaul hand hole, and the poppet valve box body still is provided with intermediate common air flue mouth, and the poppet valve box body with intermediate common air flue mouth adjacent one side is connected with the purging pipeline, and the purging pipeline, intermediate common air flue mouth respectively with intermediate common air flue intercommunication. The utility model discloses detachable intake and exhaust switching valve structure has the characteristics of strong universality, detachable, convenient replacement.

Description

Technical Field

[0001] This utility model belongs to the technical field of regenerative oxidation furnace equipment, specifically relating to a detachable intake and exhaust switching valve structure. Background Technology

[0002] A Regenerative Thermal Oxidizer (RTO) works by heating organic waste gas to over 760 degrees Celsius, causing the VOCs in the waste gas to oxidize and decompose into carbon dioxide and water. The high-temperature gas produced by oxidation flows through a specially designed ceramic heat storage medium, which heats the ceramic medium and stores heat. This stored heat is used to preheat the subsequently entering organic waste gas. The ceramic heat storage medium should be divided into two or more zones or chambers, each of which sequentially undergoes heat storage and heat release processes, operating continuously in a cyclical manner. The main structure of an RTO consists of a combustion chamber, a heat storage chamber, and a lift valve. The lift valve is a crucial component of the RTO, a key part of the cyclic heat exchange process. By switching the valve plate and the closing of the rear valve seat, it changes the inlet and outlet functions of the heat storage chamber.

[0003] Currently, many industries use RTOs to treat VOCs (volatile organic compounds), such as the chemical industry which produces sulfur ions, the pharmaceutical industry which produces chloride ions, and some industries which produce hydrogen and fluoride ions. After combustion in the RTO, these gases are cooled by heat recovery through heat storage bricks and condensed into waste gas containing acidic liquid molecules. This waste gas then passes through switching valves and exhaust pipes. Even though many switching valve manufacturers have certain anti-corrosion measures, after one to two years, the paint and corrosion residue on most of the valve bodies and connecting pipes are almost gone. Furthermore, secondary anti-corrosion construction is inconvenient and requires replacement of the valves. Traditional RTO switching valves, whether push valves or lift valves, are connected to the main equipment as a whole. The connecting pipes between each valve group are also welded to the frame or have limited positions. When the valve body corrodes or internal components fail, it is impossible to remove the valve body for replacement during operation. Most existing solutions involve major shutdowns and renovations or even complete replacements, resulting in long production downtime. In addition, most RTO equipment is expensive, and the cost of complete replacement is high. Continuing production, on the other hand, carries the environmental risks of direct discharge of waste gas.

[0004] In view of this, how to provide a detachable intake and exhaust switching valve structure that can solve the problems of long-term downtime for maintenance of the booster valve and high frequency of rectification of old RTOs through independent installation, extend the service life of the RTO system, and reduce the risk of downtime is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a detachable intake and exhaust switching valve structure that can quickly replace the lift valve of an old RTO, and has the characteristics of strong versatility and easy replacement.

[0006] The technical solution adopted by this utility model is a detachable intake and exhaust switching valve structure, including a lifting valve box. An upper partition and a lower partition are arranged in parallel inside the lifting valve box. The two partitions divide the inner cavity of the lifting valve box into an upper air duct, a middle common air duct, and a lower air duct from top to bottom. An intake and exhaust passage is opened at the top of the lifting valve box. A switching component is fixedly connected to both the intake port and the exhaust port. An inspection hand hole is opened on one side of the lifting valve box. A middle common air duct opening is also opened on the lifting valve box. A purging pipe is connected to the side of the lifting valve box adjacent to the middle common air duct opening. The purging pipe and the middle common air duct opening are respectively connected to the middle common air duct.

[0007] The feature of this utility model is that, The switching assembly includes a connecting support fixed to the top of the lifting valve housing, a pneumatic actuator fixed to the top of the connecting support, a drive shaft connected to the telescopic end of the pneumatic actuator, bearing assemblies installed at the inlet and outlet holes of the lifting valve housing, the drive shaft supported and positioned by the bearing assemblies, a valve plate fixed to the bottom of the drive shaft, and a protective cover fixed to the connection between the bottom of the valve plate and the drive shaft.

[0008] The two drive shafts are of different lengths. The valve plate at the bottom of the shorter drive shaft abuts against the upper surface of the upper partition. The longer drive shaft passes through the upper partition, and the valve plate at the bottom of the longer drive shaft abuts against the upper surface of the lower partition. A sealing assembly is fitted on the longer drive shaft located in the upper air duct.

[0009] The two ends of the sealing assembly are fixedly connected to the inner wall of the top of the lifting valve box and the upper partition, respectively.

[0010] Both the upper and lower partitions have washers and bottom rings on their upper and lower surfaces.

[0011] The washers and bottom rings are made of graphite ring washers and bottom rings.

[0012] The pneumatic actuator is connected to a junction box, which is fixedly connected to the connecting support.

[0013] The drive shaft is made of corrosion-resistant material.

[0014] Air vents are provided at corresponding positions on the side wall of the lifting valve box and at both ends of the upper and lower air ducts.

[0015] The beneficial effects of this utility model are: The detachable intake and exhaust switching valve structure of this utility model is highly versatile, detachable, easy to replace, and simple in structure. It can effectively extend the service life of the drive shaft and pneumatic actuator, and also greatly reduce the downtime for RTO replacement due to corrosion damage to the switching valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the detachable intake and exhaust switching valve structure of this utility model; Figure 2 This is a utility model Figure 1 Side view; Figure 3 This is a utility model Figure 1 Top view; Figure 4 This is a schematic diagram of the switching component 2 in the detachable intake and exhaust switching valve structure of this utility model.

[0017] In the diagram, 1. lift valve housing, 2. switching assembly, 2-1. junction box, 2-2. pneumatic actuator, 2-3. drive shaft, 2-4. connecting support, 2-5. bearing assembly, 2-6. sealing assembly, 2-7. valve plate, 2-8. protective cover, 2-9. gasket and bottom ring; 3. Inspection manhole, 4. Purge pipes, 5. Upper partition, 6. Lower partition. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] Example 1 The detachable intake and exhaust switching valve structure of this utility model is as follows: Figure 1 , Figure 2 and Figure 3 As shown, the device includes a lift valve housing 1, with an upper partition 5 and a lower partition 6 installed in parallel inside the lift valve housing 1, dividing the lift valve housing 1 from top to bottom into an upper air duct, a middle common air duct, and a lower air duct.

[0020] The top of the lift valve housing 1 is provided with an air inlet and an air outlet. Switching components 2 are welded to both the air inlet and the air outlet, serving as the air inlet switching component and the air outlet switching component.

[0021] A maintenance handhole 3 is provided on one side of the lifting valve housing 1 at the position corresponding to the switching component 2, for sealing testing and valve plate maintenance, etc.

[0022] like Figure 3 As shown, the lifting valve box 1 is also provided with an intermediate common air duct port E. The side of the lifting valve box 1 adjacent to the intermediate common air duct port is connected to a purging pipe 4. The purging pipe 4 and the intermediate common air duct port are respectively connected to the intermediate common air duct.

[0023] Example 2 Based on Example 1, such as Figure 4As shown, the switching component 2 includes a connecting support 2-4 fixed to the top of the lifting valve housing 1. A pneumatic actuator 2-2 is fixed to the top of the connecting support 2-4, and the pneumatic actuator 2-2 provides the power source for up-and-down transmission.

[0024] The telescopic end of the pneumatic actuator 2-2 is threadedly connected to the drive shaft 2-3. Bearing assemblies 2-5, including bearings and retaining rings, are installed at the inlet and outlet holes of the lifting valve housing 1. The drive shaft 2-3 passes through the inner hole of the bearing to achieve support and positioning, reducing friction and shaking when the drive shaft 2-3 rotates. A valve plate 2-7 is fixedly connected to the bottom end of the drive shaft 2-3. A protective cover 2-8 is threadedly connected to the bottom of the valve plate 2-7 at the corresponding position of the drive shaft 2-3.

[0025] Example 3 Based on Example 2, such as Figure 4 As shown, the two drive shafts 2-3 are of different lengths. The valve plate 2-7 at the bottom of the short drive shaft 2-3 abuts against the upper end face of the upper partition 5. The long drive shaft 2-3 passes through the upper partition 5, and the valve plate 2-7 at the bottom of the long drive shaft 2-3 abuts against the upper end face of the lower partition 6. A sealing assembly 2-6 is fitted on the long drive shaft 2-3 located in the upper air duct.

[0026] The drive shaft 2-3 is a corrosion-resistant drive shaft. The sealing assembly 2-6 is a sealing bushing, which is welded between the top inner wall of the lifting valve box 1 and the upper partition 5, ensuring the smooth operation of the corrosion-resistant drive shaft 2-3 and preventing air leakage between the upper and lower cavities.

[0027] Example 4 Based on Example 3, such as Figure 2 and Figure 4 As shown, washers and bottom rings 2-9 are welded to the upper end face of the upper partition 5 and the upper end face of the lower partition 6, respectively.

[0028] The gasket and bottom ring 2-9 are made of high-strength graphite ring gasket and bottom ring. The valve plate 2-7 presses down to close the valve by pressing the high-strength graphite ring gasket and bottom ring 2-9 together.

[0029] Example 5 Based on Example 4, such as Figure 4 As shown, the pneumatic actuator 2-2 is connected to a junction box 2-1, which is bolted to the connecting support 2-4 and is used for the wiring of the limit switch.

[0030] Example 6 Based on embodiment 5, air vents A and B are respectively opened at the corresponding positions of the two ends of the upper air duct on the side wall of the lifting valve box 1, and air vents C and D are respectively opened at the corresponding positions of the two ends of the lower air duct on the side wall of the lifting valve box 1.

[0031] The working process of the detachable intake and exhaust switching valve structure of this utility model is as follows: like Figure 1 As shown, in use, the upper air duct serves as the RTO intake duct, with air outlet A connected to the RTO main fan flange, air outlet B connected to the air outlet A flange of another lift valve in series, and air outlet B of the last lift valve connected to the blind flange; the lower air duct serves as the RTO exhaust duct, with air outlet C connected to the blind flange, air outlet D connected to the air outlet C flange of another lift valve in series, and air outlet D of the last lift valve connected to the chimney or heat recovery device; the intermediate common air duct outlet E is connected to the combustion chamber cavity through a duct flange; the purge pipes 4 of each lift valve group are connected to the RTO inlet.

[0032] Pneumatic actuator 2-2 provides power to the switching valve. By activating the extension and retraction of pneumatic actuator 2-2, the switching valve is opened or closed, allowing for periodic switching within a specified time to treat exhaust gas. When the lifting valve is open, the valve plate 2-7 separates from the graphite ring washer and bottom ring 2-9, allowing gas to enter and exit the combustion chamber. The corrosion-resistant drive shaft 2-3 and sealing assembly 2-6 prevent the piston of pneumatic actuator 2-2 from directly contacting the acidic exhaust gas entering the combustion chamber, greatly reducing the possibility of corrosion and increasing service life. When the switching valve is closed, the valve plate 2-7 is pressed tightly against the graphite ring washer and bottom ring 2-9, which also improves the sealing effect, reduces the leakage rate of the switching valve, and effectively extends the service life of the drive shaft and pneumatic actuator.

[0033] All wiring for solenoid valves and limit switches on pneumatic actuators is collected through junction box 2-1, allowing for valve plate sealing tests before shipment. At the customer's site, only one conduit is needed to complete the wiring connection with the switching valve, greatly reducing on-site installation and commissioning time.

[0034] The advantages of this detachable intake / exhaust switching valve structure are: By integrating the RTO's inlet and outlet ducts with the common air duct, as well as pneumatic actuators, sealing components, valve plates, etc., into a single component, if the switching valve is assessed to be corroded by acidic gases and needs to be replaced, the RTO can be shut down for a short period of time for the customer's equipment inspection. The connecting bolts on both sides can be quickly removed, and a switching valve assembly of the same size and parameters can be replaced. No crane is required; only a forklift is needed to complete the replacement, saving replacement costs and greatly reducing the downtime for RTO replacement due to corrosion damage to the switching valve. This saves time and effort for both customers and environmental protection manufacturers.

[0035] This utility model's detachable intake / exhaust switching valve structure can meet the needs of two-chamber, three-chamber, and multi-chamber RTOs by simply increasing the number of switching valves accordingly. Furthermore, when site conditions permit, multiple valve groups can be connected in parallel to meet the requirement of one valve group being on standby. When one switching valve fails, the backup switching valve can be activated immediately. It features strong versatility, detachability, and easy replacement, allowing for maintenance and replacement without shutting down the system, thus making the RTO equipment operate more stably.

[0036] Basic parameter calculation and material selection: The valve plate diameter, air inlet and outlet ducts and common air ducts have all been calculated to meet the air duct velocity design. The overall components are made of 2205 duplex stainless steel, which has good resistance to local corrosion. Compared with austenitic stainless steel with similar alloy content, its resistance to wear corrosion and fatigue corrosion is better than that of austenitic stainless steel.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0038] The above are merely preferred embodiments of the present utility model. The protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes based on the technical solution and concept of the present utility model shall fall within the protection scope of the present utility model.

[0039] Finally, it should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The use of terms such as "a," "an," or "the" in the patent application specification and claims does not indicate a quantity limitation, but rather indicates the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0041] Although this application has been described with reference to the foregoing embodiments, those skilled in the art will understand that various changes can be made without departing from the spirit and scope of this application as defined by the appended claims. While this specification contains details of many specific implementations, these should not be construed as limiting the scope of the claims, but rather as descriptions of features specific to particular embodiments. The scope of this application is defined by the appended claims and their equivalents, and is not limited to the embodiments described above.

Claims

1. A detachable intake / exhaust switching valve structure, characterized in that, The device includes a lift valve housing (1), in which an upper partition (5) and a lower partition (6) are arranged in parallel. The two partitions divide the inner cavity of the lift valve housing (1) into an upper air duct, a middle common air duct and a lower air duct from top to bottom. An air inlet and outlet passage is opened at the top of the lift valve housing (1). A switching component (2) is fixedly connected at both the air inlet and the air outlet. A maintenance hand hole (3) is opened on one side of the lift valve housing (1). A middle common air duct opening is also opened on the lift valve housing (1). A purging pipe (4) is connected to the side of the lift valve housing (1) adjacent to the middle common air duct opening. The purging pipe (4) and the middle common air duct opening are respectively connected to the middle common air duct.

2. The detachable intake / exhaust switching valve structure according to claim 1, characterized in that, The switching component (2) includes a connecting support (2-4) fixed to the top of the lifting valve housing (1), a pneumatic actuator (2-2) fixed to the top of the connecting support (2-4), a transmission shaft (2-3) connected to the telescopic end of the pneumatic actuator (2-2), bearing assemblies (2-5) installed at the inlet and outlet holes of the lifting valve housing (1), the transmission shaft (2-3) being supported and positioned by the bearing assembly (2-5), a valve plate (2-7) fixed to the bottom of the transmission shaft (2-3), and a protective cover (2-8) fixed to the bottom of the valve plate (2-7) at the connection between the bottom of the valve plate (2-7) and the transmission shaft (2-3).

3. The detachable intake / exhaust switching valve structure according to claim 2, characterized in that, The two drive shafts (2-3) are of different lengths. The valve plate (2-7) at the bottom of the short drive shaft (2-3) abuts against the upper end face of the upper partition (5). The long drive shaft (2-3) passes through the upper partition (5) and the valve plate (2-7) at the bottom of the long drive shaft (2-3) abuts against the upper end face of the lower partition (6). A sealing assembly (2-6) is fitted on the long drive shaft (2-3) located in the upper air duct.

4. The detachable intake / exhaust switching valve structure according to claim 3, characterized in that, The sealing assembly (2-6) is fixedly connected at both ends to the top inner wall of the lifting valve box (1) and the upper partition (5), respectively.

5. The detachable intake / exhaust switching valve structure according to claim 3, characterized in that, The upper end face of the upper partition (5) and the upper end face of the lower partition (6) are provided with washers and bottom rings (2-9).

6. The detachable intake / exhaust switching valve structure according to claim 5, characterized in that, The gasket and bottom ring (2-9) are made of graphite ring gasket and bottom ring.

7. The detachable intake / exhaust switching valve structure according to claim 2, characterized in that, The pneumatic actuator (2-2) is connected to a junction box (2-1), and the junction box (2-1) is fixedly connected to the connecting support (2-4).

8. The detachable intake / exhaust switching valve structure according to claim 2, characterized in that, The drive shaft (2-3) is a corrosion-resistant drive shaft.

9. The detachable intake / exhaust switching valve structure according to claim 1, characterized in that, Air vents are provided on the side wall of the lifting valve box (1) at the corresponding positions of the two ends of the upper air duct and the two ends of the lower air duct.

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