Waste gas purification equipment for heavy gas turbine

Abstract

The invention relates to the technical field of exhaust purification of internal combustion engines, in particular to waste gas purification equipment for a heavy gas turbine, which comprises an exhaust funnel body, a fixed filter disc and a movable filter disc elastically connected with the fixed filter disc are arranged in the exhaust funnel body, and a guide column penetrating through the fixed filter disc is arranged on the movable filter disc. The fixed filter disc is provided with a fixed sleeve arranged outside the guide column in a sleeving mode, the fixed sleeve is provided with a limiting column stretching into the annular guide groove, the annular guide groove is used for being matched with the limiting column to guide the movable filter disc and the fixed filter disc to rotate relative to each other, and the movable filter disc is provided with a plurality of sets of first filter holes. A plurality of groups of filtering holes II are formed in the fixed filtering disc, and the filtering holes I and the filtering holes II are distributed in a staggered manner in an initial state. The annular guide groove in the guide column is matched with the limiting column on the fixing sleeve, so that the movable filtering disc rotates in the moving process, the exhaust rate of waste gas is increased, and the exhaust back pressure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust gas purification of internal combustion engines, and in particular to an exhaust gas purification device for heavy-duty combustion engines. Background Art

[0002] Particulate matter is the main emission pollutant of gas turbines. Particulate matter mainly consists of two parts: soot and ash. Currently, filtering devices are generally used to capture soot in exhaust gas. When the soot accumulates to a certain level, it is purified through heating, combustion and other methods.

[0003] Since the existing filtering device is suitable for capturing most of the particulate matter in the exhaust of an internal combustion engine, it has a fixed gas flow area and is designed to have a filtering and capturing effect on a wide range of particle sizes. However, the particulate collector will increase the exhaust back pressure of the internal combustion engine and thus affect the power performance of the internal combustion engine. Since the design of the particulate collector needs to consider the capture efficiency of the internal combustion engine at low load, the flow area is designed to be smaller, so that the exhaust back pressure is smaller, which forms a factor that limits the performance of the internal combustion engine at high load. For this reason, the publication number is: CN111365093B, and the name is an internal combustion engine exhaust particulate matter purification device with flexible adjustable working parameters. By selecting nickel-titanium alloy materials and a structural design of deformable components, it automatically adapts and matches the corresponding flow area, thereby realizing the flexible adjustment of the exhaust flow area in the particulate matter purification device and having a simple structure.

[0004] However, the price of nickel-titanium alloy material is relatively high, which will lead to an increase in manufacturing costs when used. On the other hand, nickel-titanium alloy needs to absorb heat in the exhaust gas to deform to achieve the displacement of the second filter plate. The farther away from the exhaust gas inlet end, the lower the heating effect will be. As a result, when the speed and load of the internal combustion engine increase, it cannot respond in time to reduce the exhaust back pressure, which is insufficient. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an exhaust gas purification device for heavy-duty gas engines, which can effectively solve the problems of high cost and slow response leading to slow reduction of the exhaust back pressure of the gas engine in the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides an exhaust gas purification device for a heavy-duty combustion engine, comprising: An exhaust pipe body, wherein a fixed filter disc and a movable filter disc elastically connected to the fixed filter disc are arranged in the exhaust pipe body, the movable filter disc is provided with a guide column passing through the fixed filter disc, and the guide column is provided with an annular guide groove, the fixed filter disc is provided with a fixed sleeve mounted outside the guide column, and the fixed sleeve is provided with a limiting column extending into the annular guide groove, the annular guide groove is used to cooperate with the limiting column to guide the movable filter disc and the fixed filter disc to rotate relative to each other, the movable filter disc is provided with a plurality of groups of filter holes one, and the fixed filter disc is provided with a plurality of groups of filter holes two, and the filter holes one and the filter holes two are staggered in the initial state.

[0007] Furthermore, the movable filter disc is located at the end of the fixed filter disc close to the exhaust gas entrance, and a boss is provided at the end of the guide column extending out of the fixed filter disc. An elastic member 2 is provided on the outer sleeve of the fixed sleeve, and the two ends of the elastic member 2 are respectively connected to the boss on the guide column and the fixed filter disc. When the movable filter disc approaches the fixed filter disc, the elastic member 2 is stretched. After the thrust on the movable filter disc is cancelled, the elastic member 2 is reset to pull the guide column to drive the movable filter disc away from the fixed filter disc.

[0008] Furthermore, a protective cover is provided on one side of the guide column with a boss, and the protective cover is sleeved on the periphery of the elastic member 2 and is slidably connected to the fixed filter plate. The protective cover is used to prevent dust from accumulating on the elastic member 2 when the movable filter plate approaches the fixed filter plate and stretches the elastic member 2.

[0009] Furthermore, the annular guide groove is composed of a forward section, a return section and a reset section, the return section is parallel to the axis of the limiting column, and the forward section, the return section and the reset section form a circulating groove body.

[0010] Furthermore, it also includes a flushing rack arranged in the exhaust pipe body, the flushing rack is located on the side of the movable filter disc close to the exhaust gas entrance, and a plurality of groups of nozzles are provided on the side of the flushing rack close to the movable filter disc, the nozzles are used to spray liquid to clean the movable filter disc and the fixed filter disc.

[0011] Furthermore, a fixed plug extending into the nozzle is provided in the flushing rack, a movable sealing ring is slidably installed in the nozzle, and the movable sealing ring is slidably connected to the fixed plug, a limiting ring is provided on the side of the nozzle away from the flushing rack, and an elastic member 1 is provided between the movable sealing ring and the limiting ring, and the elastic member 1 is used to always push the movable sealing ring to contact the fixed plug for sealing.

[0012] Furthermore, the through hole in the movable sealing ring is truncated cone-shaped, and the end with a large aperture of the truncated cone-shaped through hole is located on the side close to the flushing rack, the small aperture size of the truncated cone-shaped through hole is the same as the diameter of the fixed plug, and the large aperture size of the truncated cone-shaped through hole is smaller than the inner diameter size of the nozzle.

[0013] Furthermore, it also includes a drainage float plug slidably arranged on the exhaust cylinder body, an expansion air bag located in the exhaust cylinder body and attached to the drainage float plug, and a heat conductive member, wherein the heat conductive member is arranged on the exhaust cylinder body and connected to the flushing rack.

[0014] Furthermore, a cleaning scraper is elastically mounted on one side of the movable filter disc close to the fixed filter disc, and the gap between the cleaning scraper and the fixed filter disc is smaller than the size of the cleaning scraper when squeezed and contracted, that is, when the movable filter disc moves toward the fixed filter disc, the cleaning scraper has already contacted the fixed filter disc before the movable filter disc moves to the extreme position.

[0015] Beneficial Effects Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. The exhaust gas discharge speed of the heavy-duty engine is used as the driving force for the movement of the movable filter disc. When the exhaust gas discharge rate of the heavy-duty engine increases, the exhaust gas cannot be discharged in time. At this time, the exhaust gas will push the movable filter disc to move toward the fixed filter disc. Through the cooperation of the annular guide groove on the guide column and the limit column on the fixed sleeve, the movable filter disc rotates during the movement, and the originally misaligned filter hole 1 and filter hole 2 are adjusted to an aligned state, thereby increasing the exhaust gas discharge rate and reducing the exhaust back pressure; Second, the liquid is sprayed out from the nozzle to impact the movable filter disc, driving the movable filter disc to approach the fixed filter disc. As the movable filter disc rotates, the filter hole 1 and the filter hole 2 are aligned, thereby flushing the fixed filter disc. Subsequently, the movable filter disc is reset in cooperation with the elastic member 2, and the annular guide groove and the limit column cooperate with each other to extend the flushing of the fixed filter disc by the cleaning liquid. In addition, in the process of the movable filter disc moving toward the fixed filter disc and rotating, the fixed filter disc is cleaned again in cooperation with the cleaning scraper; 3. The drainage float plug, the expansion air bag and the heat-conducting member arranged on the inner wall of the exhaust pipe body cooperate to realize the closing of the drainage float plug when exhausting and the automatic opening of the drainage float plug when cleaning the movable filter plate and the fixed filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3For the present invention Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 It is a schematic diagram of the structure explosion of the movable filter plate and the fixed filter plate of the present invention; Figure 5 For the present invention Figure 4 The enlarged schematic diagram of point B in the middle; Figure 6 It is a structural schematic diagram of the movable filter disc of the present invention; Figure 7 For the present invention Figure 2 The enlarged schematic diagram of the center C; Figure 8 For the present invention Figure 2 Enlarged schematic diagram of point D in the middle.

[0018] Figure numerals: 1. exhaust cylinder body; 11. flushing rack; 111. nozzle; 112. movable sealing ring; 113. limiting ring; 114. elastic member 1; 115. fixing plug; 116. drainage float plug; 117. expansion airbag; 118. heat conducting member; 12. movable filter disc; 1201. filter hole 1; 121. guide column; 1211. annular guide groove; 1211a. advance section; 1211b. return section; 1211c. reset section; 122. cleaning scraper; 13. fixed filter disc; 1301. filter hole 2; 131. fixing sleeve; 1311. limiting column; 132. elastic member 2. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention will be further described below in conjunction with the embodiments.

[0021] An exhaust gas purification device for heavy-duty combustion engines, see attached Figure 1-8 ,include: An exhaust pipe body 1 for treating exhaust gas, wherein a fixed filter disc 13 and a movable filter disc 12 elastically connected to the fixed filter disc 13 are arranged in the exhaust pipe body 1, and the exhaust gas enters from one end of the exhaust pipe body 1 and passes through the movable filter disc 12 and the fixed filter disc 13 in sequence, and the movable filter disc 12 and the fixed filter disc 13 treat the exhaust gas entering the field and finally discharge it, and a guide column 121 passing through the fixed filter disc 13 is arranged on the movable filter disc 12, and when the power of the heavy-duty fuel engine increases, the exhaust gas discharge volume increases, and at this time, the movable filter disc 12 moves toward the fixed filter disc 13 under the rapid exhaust blowing of the exhaust gas, and since an annular guide groove 1211 is arranged on the guide column 121, a fixed sleeve 131 is arranged on the fixed filter disc 13 and is sleeved outside the guide column 121, and a limiting column 1 extending into the annular guide groove 1211 is arranged on the fixed sleeve 131 311, the annular guide groove 1211 is used to cooperate with the limiting column 1311 to guide the movable filter disk 12 and the fixed filter disk 13 to rotate relative to each other, so that the movable filter disk 12 moves toward the fixed filter disk 13 and rotates relative to each other at the same time. The movable filter disk 12 is provided with a plurality of groups of filter holes 1201, and the fixed filter disk 13 is provided with a plurality of groups of filter holes 2 1301. The filter holes 1201 and the filter holes 2 1301 are staggered in the initial state. When the exhaust gas discharge rate is low, the exhaust gas is filtered through the plurality of groups of filter holes 1 1201 and the plurality of groups of filter holes 2 1301 in turn. When the exhaust gas discharge rate increases, the exhaust gas drives the movable filter disk 12 to approach the fixed filter disk 13 and rotate relative to each other, aligning the filter holes 1201 and the filter holes 2 1301, thereby achieving rapid exhaust and reducing the exhaust back pressure of the heavy-duty fuel engine.

[0022] Specifically, the movable filter disc 12 is located at the end of the fixed filter disc 13 close to the exhaust gas entrance, and a boss is provided at the end of the guide column 121 extending out of the fixed filter disc 13. An elastic member 132 is provided on the outer periphery of the fixed sleeve 131, and the two ends of the elastic member 132 are respectively connected to the boss on the guide column 121 and the fixed filter disc 13. Since the guide column 121 will rotate, a swivel is provided at the connecting end of the elastic member 132 and the guide column 121 to prevent the elastic member 132 from detaching from the guide column 121 and to prevent the elastic member 132 from restricting the rotation of the guide column 121. When the movable filter disc 12 approaches the fixed filter disc 13, the elastic member 132 is stretched. After the thrust on the movable filter disc 12 is cancelled, the elastic member 132 is reset to pull the guide column 121 to drive the movable filter disc 12 away from the fixed filter disc 13.

[0023] Among them, a protective cover is provided on one side of the guide column 121 with a boss, and the protective cover is sleeved on the periphery of the elastic member 132 and is slidably connected to the fixed filter plate 13. The protective cover is used to prevent dust from accumulating on the elastic member 132 when the movable filter plate 12 approaches the fixed filter plate 13 and stretches the elastic member 132.

[0024] In addition, the annular guide groove 1211 is composed of a progress segment 1211a, a return segment 1211b and a reset segment 1211c. The return segment 1211b is parallel to the axis of 121, and the progress segment 1211a, the return segment 1211b and the reset segment 1211c form a circulating groove body. When the movable filter disc 12 is blown close to the fixed filter disc 13 by the exhaust gas, the limiting column 1311 moves from the connection between the progress segment 1211a and the reset segment 1211c to the connection between the progress segment 1211a and the return segment 1211b, guiding the movable filter disc 12 to rotate, thereby realizing the alignment of the filter hole 1 1201 and the filter hole 2 1301.

[0025] In the above technical solution, the exhaust gas discharge speed of the heavy-duty fuel engine is used as the driving force for the movement of the movable filter disk 12. When the exhaust gas discharge rate of the heavy-duty fuel engine increases, the exhaust gas cannot be discharged in time. At this time, the exhaust gas will push the movable filter disk 12 to move toward the fixed filter disk 13. Through the cooperation of the annular guide groove 1211 on the guide column 121 and the limiting column 1311 on the fixed sleeve 131, the movable filter disk 12 rotates during the movement, and the originally misaligned filter hole 1201 and the filter hole 2 1301 are adjusted to an aligned state, thereby increasing the exhaust gas discharge rate and reducing the exhaust back pressure.

[0026] In addition, it also includes a flushing rack 11 arranged in the exhaust pipe body 1, and the flushing rack 11 is located on the side of the movable filter plate 12 close to the exhaust gas inlet. The side of the flushing rack 11 close to the movable filter plate 12 is provided with a plurality of nozzles 111, and the nozzles 111 correspond to the filter holes 1301. The nozzles 111 are used to spray liquid to clean the movable filter plate 12 and the fixed filter plate 13. When the movable filter plate 12 and the fixed filter plate 13 need to be cleaned, the nozzles 111 spray water to impact the movable filter plate 12. At this time, the movable filter disk 12 approaches the fixed filter disk 13 and rotates. When the filter hole 1201 and the filter hole 2 1301 are aligned, the water sprayed from the nozzle 111 passes through the filter hole 1201 and hits the fixed filter disk 13. At this time, the impact force of the water flow on the movable filter disk 12 is reduced. The movable filter disk 12 will slide along the axis and then reset with the cooperation of the annular guide groove 1211 and the limiting column 1311, and the movable filter disk 12 and the fixed filter disk 13 are repeatedly cleaned in this way.

[0027] Furthermore, a fixed plug 115 extending into the nozzle 111 is provided in the flushing frame 11, a movable sealing ring 112 is slidably installed in the nozzle 111, and the movable sealing ring 112 is slidably connected to the fixed plug 115, a limiting ring 113 is provided on the side of the nozzle 111 away from the flushing frame 11, and an elastic member 114 is provided between the movable sealing ring 112 and the limiting ring 113, and the elastic member 114 is used to push the movable sealing ring 112 to contact with the fixed plug 115 for sealing. When liquid is injected into the flushing frame 11, the liquid After the body is pressurized, it pushes the elastic member 114 to separate from the fixed plug 115, and then discharges the water and shoots it toward the movable filter plate 12. Furthermore, the through hole in the movable sealing ring 112 is truncated cone-shaped, and the end of the large aperture of the truncated cone-shaped through hole is located on the side close to the flushing rack 11, the small aperture size of the truncated cone-shaped through hole is the same as the diameter of the fixed plug 115, and the large aperture size of the truncated cone-shaped through hole is smaller than the inner diameter size of the nozzle 111. The setting of the truncated cone hole on the movable sealing ring 112 increases the speed of the liquid flowing out of the nozzle 111.

[0028] It is worth mentioning that it also includes a drainage float 116 slidably arranged on the exhaust cylinder body 1, an expansion airbag 117 and a heat conductor 118 located in the exhaust cylinder body 1 and attached to the drainage float 116. The heat conductor 118 is arranged on the exhaust cylinder body 1 and is connected to the flushing rack 11. The drainage float 116 is slidably installed on the exhaust cylinder body 1 through a sliding rod. In the exhaust state, due to a certain temperature, the exhaust cylinder body 1 will be heated after a long period of exhaust. At this time, the heat will be conducted to the expansion airbag 117. At this time, the expansion airbag 117 expands and squeezes the drainage float 116, so that the drainage float 116 will not rise in the exhaust state. During cleaning, when the nozzle 111 discharges liquid to clean the movable filter plate 12 and the fixed filter plate 13, the cleaning liquid will be in the drain The cleaning liquid is retained in the air cylinder body 1. When the cleaning liquid enters the flushing rack 11, it will first pass through the heat conductor 118. The heat conductor 118 will conduct the heat of the expansion airbag 117. At this time, the expansion airbag 117 contracts to cancel the squeezing of the drainage float 116. The drainage float 116 rises due to buoyancy, and then discharges the cleaning liquid out of the exhaust cylinder body 1. Since the movable filter disc 12 is elastically installed with a cleaning scraper 122 on one side close to the fixed filter disc 13, and the gap between the cleaning scraper 122 and the fixed filter disc 13 is smaller than the size of the cleaning scraper 122 squeezed and contracted, that is, when the movable filter disc 12 moves toward the fixed filter disc 13, when the movable filter disc 12 has not moved to the extreme position, the cleaning scraper 122 has already contacted the fixed filter disc 13, thereby further improving the cleaning effect.

[0029] In the above technical scheme, liquid is sprayed out by the nozzle 111 to impact the movable filter disk 12, driving the movable filter disk 12 to approach the fixed filter disk 13, and as the movable filter disk 12 rotates, the filter hole 1201 and the filter hole 2 1301 are aligned, thereby flushing the fixed filter disk 13, and then the movable filter disk 12 is reset in cooperation with the elastic member 2 132, and the annular guide groove 1211 and the limiting column 1311 cooperate with each other, thereby prolonging the flushing of the fixed filter disk 13 by the cleaning liquid, and in the process of the movable filter disk 12 moving and rotating toward the fixed filter disk 13, the fixed filter disk 13 is cleaned again in cooperation with the cleaning scraper 122, in addition, the drainage float 116, the expansion air bag 117 and the heat conducting member 118 arranged on the inner wall of the exhaust pipe body 1 cooperate to realize the closing of the drainage float 116 during exhaust and the automatic opening of the drainage float 116 when cleaning the movable filter disk 12 and the fixed filter disk 13.

[0030] Working principle: The exhaust gas discharge speed of the heavy-duty fuel engine is used as the driving force for the movement of the movable filter disc 12. When the exhaust gas discharge rate of the heavy-duty fuel engine increases, the exhaust gas cannot be discharged in time. At this time, the exhaust gas will push the movable filter disc 12 to move toward the fixed filter disc 13. The annular guide groove 1211 on the guide column 121 and the limit column 1311 on the fixed sleeve 131 cooperate to make the movable filter disc 12 rotate during the movement, and adjust the originally misaligned filter hole 1201 and the filter hole 2 1301 to an aligned state. In the exhaust state, since the exhaust gas has a certain temperature, the exhaust pipe body 1 will be heated after a long period of exhaust. At this time, the heat will be conducted to the expansion airbag 117. The expansion airbag 117 expands and squeezes the drainage float 116, so that the drainage float 116 will not rise in the exhaust state, thereby increasing the exhaust gas discharge rate and reducing the exhaust back pressure. When it is necessary to clean the movable filter disc 12 and the fixed filter disc 13, liquid is sprayed through the nozzle 111 to flush the movable filter disc 12, and at the same time drive the movable filter disc 12 to be cleaned. The filter disc 12 approaches the fixed filter disc 13. As the movable filter disc 12 rotates, the filter hole 1201 and the filter hole 2 1301 are aligned, thereby flushing the fixed filter disc 13. Subsequently, the movable filter disc 12 is reset with the help of the elastic member 2 132. The annular guide groove 1211 and the limiting column 1311 cooperate with each other to extend the time for the cleaning liquid to enter the fixed filter disc 13 during the return process, thereby improving the cleaning effect of the fixed filter disc 13. At the same time, when the movable filter disc 12 is moved toward the fixed During the process of the filter disc 13 moving and rotating, the fixed filter disc 13 is cleaned again in cooperation with the cleaning scraper 122. When the cleaning liquid is retained in the exhaust pipe body 1 after cleaning, the cleaning liquid will first pass through the heat conductor 118 when entering the flushing rack 11. The heat conductor 118 will conduct the heat of the expansion airbag 117. At this time, the expansion airbag 117 contracts to cancel the squeezing of the drainage float 116. The drainage float 116 rises due to buoyancy, and then discharges the cleaning liquid out of the exhaust pipe body 1, thereby realizing the automatic discharge of the cleaning liquid.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An exhaust gas purification device for a heavy-duty combustion engine, characterized in that: include: An exhaust cylinder body (1) is provided with a fixed filter plate (13) and a movable filter plate (12) elastically connected to the fixed filter plate (13) in the exhaust cylinder body (1); the movable filter plate (12) is provided with a guide column (121) passing through the fixed filter plate (13), and the guide column (121) is provided with an annular guide groove (1211); the fixed filter plate (13) is provided with a fixed sleeve (131) sleeved outside the guide column (121), and the fixed sleeve (131) is provided with A limiting post (1311) extends into the annular guide groove (1211), and the annular guide groove (1211) is used to cooperate with the limiting post (1311) to guide the movable filter disc (12) and the fixed filter disc (13) to rotate relative to each other, the movable filter disc (12) is provided with a plurality of groups of filter holes one (1201), and the fixed filter disc (13) is provided with a plurality of groups of filter holes two (1301), and the filter holes one (1201) and the filter holes two (1301) are staggered in an initial state.

2. The exhaust gas purification device for a heavy-duty combustion engine according to claim 1, characterized in that: The movable filter disc (12) is located at an end of the fixed filter disc (13) close to the exhaust gas inlet, and a boss is provided at one end of the guide column (121) extending out of the fixed filter disc (13). An elastic member 2 (132) is provided on the outer sleeve of the fixed sleeve (131), and two ends of the elastic member 2 (132) are respectively connected to the boss on the guide column (121) and the fixed filter disc (13). When the movable filter disc (12) approaches the fixed filter disc (13), the elastic member 2 (132) stretches. After the thrust on the movable filter disc (12) is canceled, the elastic member 2 (132) returns to its original position to pull the guide column (121) to drive the movable filter disc (12) away from the fixed filter disc (13).

3. The exhaust gas purification device for a heavy-duty combustion engine according to claim 2, characterized in that: A protective cover is provided on one side of the guide column (121) provided with a boss, and the protective cover is sleeved on the periphery of the second elastic member (132) and is slidably connected to the fixed filter plate (13), and the protective cover is used to prevent dust from accumulating on the second elastic member (132) when the movable filter plate (12) approaches the fixed filter plate (13) and stretches the second elastic member (132).

4. The exhaust gas purification device for a heavy-duty combustion engine according to claim 1, characterized in that: The annular guide groove (1211) is composed of a forward segment (1211a), a return segment (1211b) and a reset segment (1211c); the return segment (1211b) is parallel to the axis of the limiting column (121); and the forward segment (1211a), the return segment (1211b) and the reset segment (1211c) form a circulating groove body.

5. The exhaust gas purification device for a heavy-duty combustion engine according to claim 1, characterized in that: It also includes a flushing rack (11) disposed in the exhaust pipe body (1), the flushing rack (11) being located on a side of the movable filter disc (12) close to where exhaust gas enters, and a plurality of groups of spray heads (111) are provided on a side of the flushing rack (11) close to the movable filter disc (12), the spray heads (111) being used to spray liquid to clean the movable filter disc (12) and the fixed filter disc (13).

6. The exhaust gas purification device for a heavy-duty combustion engine according to claim 5, characterized in that: A fixed plug (115) extending into the nozzle (111) is provided in the flushing frame (11), a movable sealing ring (112) is slidably installed in the nozzle (111), and the movable sealing ring (112) is slidably connected to the fixed plug (115), a limiting ring (113) is provided on the side of the nozzle (111) away from the flushing frame (11), and an elastic member (114) is provided between the movable sealing ring (112) and the limiting ring (113), and the elastic member (114) is used to constantly push the movable sealing ring (112) to contact with the fixed plug (115) for sealing.

7. The exhaust gas purification device for a heavy-duty combustion engine according to claim 6, characterized in that: The through hole in the movable sealing ring (112) is truncated cone-shaped, and the end with a large aperture of the truncated cone-shaped through hole is located on a side close to the flushing rack (11), the small aperture size of the truncated cone-shaped through hole is the same as the diameter of the fixed plug (115), and the large aperture size of the truncated cone-shaped through hole is smaller than the inner diameter size of the nozzle (111).

8. The exhaust gas purification device for a heavy-duty combustion engine according to claim 1, characterized in that: It also includes a drainage float plug (116) slidably arranged on the exhaust cylinder body (1), an expansion air bag (117) located in the exhaust cylinder body (1) and in contact with the drainage float plug (116), and a heat conducting member (118), wherein the heat conducting member (118) is arranged on the exhaust cylinder body (1) and is connected to the flushing rack (11).

9. The exhaust gas purification device for a heavy-duty combustion engine according to claim 1, characterized in that: A cleaning scraper (122) is elastically mounted on one side of the movable filter disc (12) close to the fixed filter disc (13), and the gap between the cleaning scraper (122) and the fixed filter disc (13) is smaller than the size of the cleaning scraper (122) when squeezed and shrunk, that is, when the movable filter disc (12) moves toward the fixed filter disc (13), the cleaning scraper (122) is already in contact with the fixed filter disc (13) before the movable filter disc (12) moves to the extreme position.

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