Flue gas filtering device for gas-fired boiler

Abstract

The utility model relates to the technical field of smoke filtering, in particular to a smoke filtering device for a gas-fired boiler, which comprises a smoke exhaust pipeline with a smoke inlet pipe and a smoke outlet pipe, two groups of bypass pipes are connected in parallel between the smoke inlet pipe and the smoke outlet pipe, and the middle positions of the bypass pipes are detachably connected with filtering structures. Electromagnetic valves mounted on the bypass pipe are arranged on the two sides of the filtering structure, a pressure sensor facing the smoke coming side is arranged in the middle of the interior of the smoke outlet pipe, and the pressure sensor and the four electromagnetic valves are electrically connected with the controller; according to the utility model, the condition that the flue gas passing rate of the filter structure is reduced to a certain degree to cause flue gas blockage and even flue gas backflow is avoided, and the condition that normal filtration of the flue gas needs to be stopped when the filter is disassembled is avoided, so that the continuous filtration treatment of the flue gas is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas filtering, in particular to a flue gas filtering device for a gas boiler. Background Art

[0002] In order to implement the "Environmental Protection Law of the People's Republic of China" and the "Law of the People's Republic of China on the Prevention and Control of Air Pollution", control boiler pollutant emissions, and prevent air pollution, the state has formulated the "Boiler Air Pollutant Emission Standard". This standard stipulates the maximum allowable emission concentrations of smoke, sulfur dioxide and nitrogen oxides in boiler flue gas and the emission limits of flue gas blackness by year. At the same time, in order to meet more stringent local standards or even enterprise standards, it is necessary to strictly control the flue gas filtration. After searching, the Chinese patent with publication number CN213454258U discloses a flue gas filtration device for a condensing gas module boiler, including a filter box, a mounting mechanism is provided inside the filter box, a driving mechanism is provided outside the lower end of the filter box, a filtering mechanism is provided inside the mounting mechanism, and a moving mechanism is provided at the top of the filter box. The mounting mechanism includes a smoke inlet, a smoke inlet, and a driving mechanism is provided outside the lower end of the filter box. A smoke outlet is provided through the filter box at the upper end, and a smoke outlet is provided through the filter box wall at the end away from the smoke inlet. When in use, a stepper motor and an active bevel gear can drive the threaded rod to rotate under the action of a driven bevel gear and a bearing, thereby driving the threaded sleeve to move up and down through the limiting action of the slide groove and the first filter plate and the second filter plate, so as to drive the first filter plate and the second filter plate to move, so that under the action of the driving motor and the fan blades, smoke of different sizes can be quickly absorbed and filtered. Although it is convenient for secondary filtration, as the filtration proceeds, the filtration efficiency of the first filter plate and the second filter plate decreases, and then the smoke pass rate decreases, which can easily lead to blockage and even smoke backflow. If it needs to be disassembled for replacement, the smoke filtration needs to be stopped, which can easily affect the normal filtration of the smoke. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the shortcomings of the prior art, the utility model provides a flue gas filtering device for a gas boiler, which avoids the situation where the flue gas pass rate of the filtering structure is reduced to a certain level, causing flue gas blockage or even flue gas backflow, and ensures continuous filtering of the flue gas by avoiding the need to stop normal filtering of the flue gas when disassembling the filter.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a flue gas filtering device for a gas boiler, comprising a smoke exhaust duct with a smoke inlet pipe and a smoke outlet pipe, two groups of bypass pipes are connected in parallel between the smoke inlet pipe and the smoke outlet pipe, a filtering structure is detachably connected to the middle position of the bypass pipe, solenoid valves installed on the bypass pipe are arranged on both sides of the filtering structure, a pressure sensor facing the incoming smoke side is arranged at the inner middle position of the smoke outlet pipe, and a controller is also included, and the pressure sensor and four solenoid valves are electrically connected to the controller.

[0007] Preferably, the bypass pipe includes bypass pipe one and bypass pipe two which are respectively connected to the smoke inlet pipe and the smoke outlet pipe and whose free ends are arranged opposite to each other, the two solenoid valves are respectively installed on bypass pipe one and bypass pipe two, and the filtering structure is detachably connected between bypass pipe one and bypass pipe two.

[0008] Preferably, the filtering structure includes a ferrule with a double-layer filtering mechanism, and the ferrule is sealed and clamped between bypass pipe one and bypass pipe two through an internally threaded connecting pipe threadedly connected to the free end of bypass pipe two, and a clamping tube that slides with the ferrule is provided on one side of the internally threaded connecting pipe close to bypass pipe one, and a sealing clamping edge that cooperates with bypass pipe one and the clamping tube is provided on the ferrule.

[0009] Preferably, the double-layer filtering mechanism includes filter plate 1 and filter plate 2, a retaining frame is provided at one end of the ferrule, the filter plate 1 and filter plate 2 are both slidably matched with the ferrule and stacked on the retaining frame, and a spacer ring is provided between the filter plate 1 and the filter plate 2.

[0010] Preferably, a plurality of tooth grooves are provided on the sealing card edge, and a plurality of clamping teeth matched with the tooth grooves are provided on the clamping tube.

[0011] Preferably, it also includes a fixed connection frame connecting the two bypass pipes 1 and the two bypass pipes 2, the controller is fixedly installed on the fixed connection frame, and two alarms are also installed on the fixed connection frame, and both alarms are electrically connected to the controller.

[0012] Preferably, the pressure sensor is fixedly installed in the smoke outlet pipe via a bracket.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a flue gas filtering device for a gas boiler, which has the following beneficial effects:

[0015] The flue gas filtering device for a gas boiler has two groups of bypass pipes with filtering structures connected in parallel on the smoke exhaust pipe. When the smoke pass rate of the filtering structure in the bypass pipe on one side is reduced to a certain level, as the smoke circulation rate is reduced, the impact force of the smoke on the pressure sensor is reduced to a certain level, and the pressure sensor transmits a signal to the controller, and the controller simultaneously transmits signals to the four solenoid valves on the two bypass pipes, controls the two solenoid valves on the side to be closed, and opens the two solenoid valves on the other bypass pipe, so that the smoke can be automatically replaced with the bypass pipe on the other side for circulation, and the filtering structure on the other side is used for replacement, and the filtering structure on the side where the smoke is not circulating is replaced at the same time, thereby avoiding the situation where the smoke pass rate of the filtering structure is reduced to a certain level, resulting in smoke blockage or even smoke backflow, and ensuring continuous filtering of the smoke by avoiding the situation where the normal filtering of the smoke needs to be stopped due to the removal of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model as a whole;

[0017] Figure 2 For this utility model Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0018] Figure 3 It is a schematic diagram of the structure of the utility model decomposed from other perspectives as a whole;

[0019] Figure 4 For this utility model Figure 3 A schematic diagram of the local enlarged structure at B in the middle;

[0020] Figure 5 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the smoke outlet pipe, pressure sensor and bracket of the utility model;

[0022] Figure 7 The utility model is a schematic diagram of the structure of the ferrule, the first filter plate, the second filter plate and the spacer ring.

[0023] Markings in the attached drawings: 1. Smoke inlet pipe; 2. Smoke outlet pipe; 3. Bypass pipe 1; 4. Bypass pipe 2; 5. Solenoid valve; 6. Pressure sensor; 7. Controller; 8. Alarm; 9. Bracket; 10. Internal thread connecting pipe; 11. Clamping pipe; 12. Clamping sleeve; 13. Grid frame; 14. Filter plate 1; 15. Filter plate 2; 16. Spacer; 17. Tooth socket; 18. Clamping tooth; 19. Fixed connecting frame. DETAILED DESCRIPTION

[0024] 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. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example:

[0026] See also Figure 1-7 A flue gas filtering device for a gas boiler comprises a smoke exhaust pipe having a smoke inlet pipe 1 and a smoke outlet pipe 2, two sets of bypass pipes are connected in parallel between the smoke inlet pipe 1 and the smoke outlet pipe 2, a filtering structure is detachably connected in the middle of the bypass pipe, solenoid valves 5 installed on the bypass pipe are arranged on both sides of the filtering structure, a pressure sensor 6 facing the incoming smoke side is arranged in the middle of the smoke outlet pipe 2, and a controller 7 is also included, and the pressure sensor 6 and the four solenoid valves 5 are electrically connected to the controller 7.

[0027] Specifically, the bypass pipe includes a bypass pipe 1 3 and a bypass pipe 2 4 which are respectively connected to the smoke inlet pipe 1 and the smoke outlet pipe 2 and whose free ends are arranged opposite to each other. Two solenoid valves 5 are respectively installed on the bypass pipe 1 3 and the bypass pipe 2 4. The filter structure is detachably connected between the bypass pipe 1 3 and the bypass pipe 2 4. The bypass pipe 1 3 and the bypass pipe 2 4 are convenient for connecting the filter structure and connecting with the smoke inlet pipe 1 and the smoke outlet pipe 2. The two solenoid valves 5 are respectively installed on the bypass pipe 1 3 and the bypass pipe 2 4 to facilitate the disconnection of the filter structure from the smoke exhaust pipe.

[0028] Specifically, the filtering structure includes a ferrule 12 with a double-layer filtering mechanism, and the ferrule 12 is sealed and clamped between the bypass pipe 13 and the bypass pipe 24 through the internal threaded connecting pipe 10 threadedly connected to the free end of the bypass pipe 24. A clamping pipe 11 that slides with the ferrule 12 is provided on the side of the internal threaded connecting pipe 10 close to the bypass pipe 3, and a sealing clamping edge that cooperates with the bypass pipe 3 and the clamping pipe 11 is provided on the ferrule 12. By sliding the ferrule 12 into the clamping pipe 11, and then screwing the internal threaded connecting pipe 10 and moving it to the bypass pipe 3 side, it is convenient to clamp the ferrule 12 between the internal threaded connecting pipe 10 and the bypass pipe 3. When disassembly is required, it is only necessary to reversely screw the internal threaded connecting pipe 10 to retreat the internal threaded connecting pipe 10 to a certain distance away from the bypass pipe 3, and then take out the ferrule 12 inserted in the clamping pipe 11 and replace it.

[0029] The filter element 14 is a filter element which is arranged on the filter housing 12 and is used to filter the filter elements 14 and 15. The filter element 14 is a filter element which is used to filter the filter elements 14 and 15. The filter element 14 is a filter element which is used to filter the filter elements 14 and 15.

[0030] Specifically, a plurality of tooth grooves 17 are provided on the sealing card edge, and a plurality of teeth 18 matched with the tooth grooves 17 are provided on the card tube 11. Through the cooperation of the plurality of tooth grooves 17 and the plurality of teeth 18, it is convenient to lock the angle of the card sleeve 12, and avoid the situation that the card sleeve 12 automatically rotates when removed into the card tube 11, thereby improving the stability of the card sleeve 12 during installation and removal, and improving the strength during connection.

[0031] Specifically, it also includes a fixed connecting frame 19 connecting two bypass pipes 1 3 and two bypass pipes 2 4. The controller 7 is fixedly installed on the fixed connecting frame 19. Two alarms 8 are also installed on the fixed connecting frame 19. The two alarms 8 are electrically connected to the controller 7. Through the fixed connecting frame 19, it is convenient to connect the two bypass pipes 1 3 and the bypass pipe 2 4 as a whole, thereby improving the overall stability of the device. When one of the controllers 7 controls the two solenoid valves 5 on one of the bypass pipes to close, a signal is simultaneously transmitted to one of the alarms 8, causing it to alarm, thereby notifying the operator to replace the filter structure on the bypass pipe on that side.

[0032] Specifically, the pressure sensor 6 is fixedly installed in the smoke outlet pipe 2 via the bracket 9. The bracket 9 facilitates the support of the pressure sensor 6 to prevent the smoke from blowing the pressure sensor 6 away.

[0033] When in use, connect the flue gas inlet pipe 1 to the flue gas pipeline of the gas boiler, first open the two solenoid valves 5 on one side, let the flue gas flow from the bypass pipe on one side, and use the filter structure in the bypass pipe on this side for filtering. When the flue gas pass rate of the filter structure in the bypass pipe on this side is reduced to a certain level, as the flue gas flow rate decreases, the impact force of the flue gas on the pressure sensor 6 is reduced to a certain level, the pressure sensor 6 transmits a signal to the controller 7, and the controller 7 transmits a signal to the four solenoid valves 5 on the two bypass pipes at the same time, controls the two solenoid valves 5 on this side to close, and opens the two solenoid valves 5 on the other bypass pipe, so that the flue gas can be automatically replaced to flow through the bypass pipe on the other side, and the filter structure on the other side is used for replacement, and then the filter structure on the side where the flue gas does not flow can be replaced.

[0034] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0035] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0036] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0037] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A flue gas filtering device for a gas boiler, characterized in that: The invention comprises a smoke exhaust pipe having a smoke inlet pipe (1) and a smoke outlet pipe (2), two groups of bypass pipes are connected in parallel between the smoke inlet pipe (1) and the smoke outlet pipe (2), a filtering structure is detachably connected to the middle position of the bypass pipe, solenoid valves (5) installed on the bypass pipe are arranged on both sides of the filtering structure, a pressure sensor (6) facing the incoming smoke side is arranged at the middle position inside the smoke outlet pipe (2), and a controller (7) is also included, and the pressure sensor (6) and four solenoid valves (5) are electrically connected to the controller (7).

2. The flue gas filtering device for a gas boiler according to claim 1, characterized in that: The bypass pipe comprises a bypass pipe 1 (3) and a bypass pipe 2 (4) which are respectively connected to the smoke inlet pipe (1) and the smoke outlet pipe (2) and whose free ends are arranged opposite to each other. The two solenoid valves (5) are respectively installed on the bypass pipe 1 (3) and the bypass pipe 2 (4). The filtering structure is detachably connected between the bypass pipe 1 (3) and the bypass pipe 2 (4).

3. The flue gas filtering device for a gas boiler according to claim 2, characterized in that: The filtering structure comprises a ferrule (12) having a double-layer filtering mechanism, wherein the ferrule (12) is sealed and clamped between bypass pipe one (3) and bypass pipe two (4) through an internally threaded connecting pipe (10) threadedly connected to the free end of bypass pipe two (4), a clamping pipe (11) slidably matched with the ferrule (12) is provided on one side of the internally threaded connecting pipe (10) close to bypass pipe one (3), and a sealing clamping edge matched with bypass pipe one (3) and the clamping pipe (11) is provided on the ferrule (12).

4. The flue gas filtering device for a gas boiler according to claim 3, characterized in that: The double-layer filtering mechanism comprises a filter plate 1 (14) and a filter plate 2 (15); a retaining frame (13) is provided at one end of the ferrule (12); the filter plate 1 (14) and the filter plate 2 (15) are both slidably matched with the ferrule (12) and stacked on the retaining frame (13); a spacer (16) is provided between the filter plate 1 (14) and the filter plate 2 (15).

5. The flue gas filtering device for a gas boiler according to claim 4, characterized in that: The sealing clamp edge is provided with a plurality of tooth grooves (17), and the clamp tube (11) is provided with a plurality of clamp teeth (18) matched with the tooth grooves (17).

6. The flue gas filtering device for a gas boiler according to claim 5, characterized in that: It also includes a fixed connecting frame (19) connecting the two bypass pipes 1 (3) and the two bypass pipes 2 (4), the controller (7) is fixedly mounted on the fixed connecting frame (19), and two alarms (8) are also mounted on the fixed connecting frame (19), and both alarms (8) are electrically connected to the controller (7).

7. The flue gas filtering device for a gas boiler according to claim 6, characterized in that: The pressure sensor (6) is fixedly installed in the smoke outlet pipe (2) via a bracket (9).

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