Energy-saving steam generator

Abstract

The invention relates to the technical field of steam generators, in particular to an energy-saving steam generator which comprises a furnace body and an auxiliary heating mechanism arranged in the furnace body, a partition plate is fixed in the furnace body, and an inner hearth and an outer hearth are fixed to the partition plate; the inner hearth is sleeved with the outer hearth, a first clamping cavity is formed between the outer hearth and the inner hearth, the flue pipe is arranged above the inner hearth and the outer hearth, dust falling holes are formed in the bottom of the flue pipe, the air outlet end of the smoke pipe is connected to the flue pipe, and the air inlet end of the smoke pipe is connected to the outer hearth. A second clamping cavity is formed between the outer hearth and the cavity wall of the furnace body, and the heating efficiency of water in the inner hearth is further improved. The industrial waste gas is applied to assist in the inner hearth, so that water in the inner hearth is rapidly heated to boil, the single heating mode of the combustion chamber is assisted, the heating efficiency is improved, biomass particles are saved, and energy is saved.

Description

Technical Field

[0001] The invention relates to the technical field of steam generators, in particular to an energy-saving steam generator. Background Art

[0002] A steam generator is a mechanical device that heats water and consumes fuel and other energy to generate steam. It is energy-saving, environmentally friendly, and has high heating efficiency. Therefore, it is widely used in various processing techniques. It consists of a furnace body, an economizer, a combustion chamber, pipelines, and a steam exhaust pipe. The steam principle is as follows: the economizer preheats the added water and sends it to the evaporator furnace body. The burner ignites and sprays the flame into the furnace cavity to enhance heat exchange. The heat then enters the economizer to heat the flue gas, which is discharged to the outside through an exhaust pipe connected to the outdoors. The water in the evaporator furnace undergoes a return journey to enhance heat exchange and generate steam, which is then discharged to a third-party device through two steam pipes.

[0003] The existing steam generator heats the water in the furnace water pipe to boiling only by ignition and combustion in the combustion chamber. In this process, a large amount of biomass particles are consumed, and a blower is required to induce air at the same time. The heating efficiency is low and the energy saving needs to be further improved. Summary of the invention

[0004] In order to solve the above problems and further improve the energy saving performance of the steam generator, the present invention provides an energy-saving steam generator, including a furnace body and an auxiliary heating mechanism arranged in the furnace body, a partition is fixed in the furnace body, an inner furnace and an outer furnace are fixed on the partition, the outer furnace is sleeved outside the inner furnace and forms a first cavity between the inner furnace, the auxiliary heating mechanism includes a flue gas pipe filled in the first cavity, and also includes a flue pipe arranged above the inner furnace and the outer furnace, a dust reduction hole is opened at the bottom of the flue pipe, an air inlet end of the flue pipe passes through the outside of the furnace body, an air outlet end of the flue pipe is connected to the flue pipe, a second cavity is formed between the outer furnace and the cavity wall of the furnace body, the dust reduction hole is vertically above the second cavity and communicates with the second cavity from top to bottom, An exhaust pipe is installed from the inside of the second clamping cavity to the outside of the furnace body, the auxiliary heating mechanism also includes a first steam exhaust pipe installed at the top of the inner furnace, the first steam exhaust pipe is installed with a first valve, the first steam exhaust pipe extends upward to the outside of the furnace body, the auxiliary heating mechanism also includes a capillary installed in the inner furnace, a second steam exhaust pipe is installed on the capillary, a secondary utilization pipe is installed in the flue pipe, the other end of the second steam exhaust pipe enters the flue pipe and is connected to the secondary utilization pipe, a precipitation hole connected with the dust reduction hole above and below is provided at the bottom of the secondary utilization pipe, a second valve is installed on the second steam exhaust pipe, the rated opening pressure of the second valve is less than the rated opening pressure of the first valve, and a plurality of injection holes are provided on the capillary.

[0005] As a further preference, several of the injection holes are arranged at the bottom end of the capillary, the capillary is vertically arranged in the inner furnace and coincides with the axis of the inner furnace, and the water inlet pipe enters the furnace body from the outside of the furnace body and is connected to the inner furnace.

[0006] As a further preference, the flue gas pipe is a spiral tube, and the spiral direction of the flue gas pipe is closely attached to the outer wall of the inner furnace along the height direction of the clamping cavity.

[0007] As a further preference, a filter cover is installed on the discharge pipe, and the filter cover is fixed on the top surface of the partition.

[0008] As a further preference, the flue pipe is a rectangular tube, which surrounds the outer periphery of the outer furnace, and the secondary utilization pipe is a circular tube, which surrounds the inside of the flue pipe, and a dust reduction chamber is formed between the tube wall of the secondary utilization pipe and the inner wall of the tube cavity of the flue pipe.

[0009] As a further preferred embodiment, a combustion chamber is installed at the bottom of the partition, a heat collecting hood is fixed to the bottom of the inner furnace, the bottom end of the capillary extends into the heat collecting hood and is connected to the heat collecting hood up and down, the heat collecting hood is a trumpet hood that gradually becomes thicker from the top to the bottom, and the combustion chamber is located on the bottom side of the heat collecting hood.

[0010] As a further preference, a spray pipe is installed on some of the dust removal holes, the spray pipe is vertically downward, and a spray head inclined to one side is installed at the bottom end of the spray pipe.

[0011] As a further preferred embodiment, a carrier plate is fixed in the second clamping cavity, and a through hole is opened on the carrier plate. The auxiliary heating mechanism also includes a lifting rod assembled in the through hole, and a lifting ring is installed on the top of the lifting rod. The lifting ring is located in the second clamping cavity and can complete the lifting action along the height direction of the second clamping cavity. A storage cavity is provided on the top of the lifting ring, and a spring is provided on the top surface of the partition. The spring is sleeved on the lifting rod, and the bottom end of the spring is elastically supported on the top surface of the partition, and the top end of the spring is elastically supported on the bottom surface of the lifting ring. The opening of the storage cavity faces upward and faces the nozzle and the dust reduction hole. When the lifting ring descends to the bottom of the discharge pipe, the sewage dripping in the storage cavity is discharged outward through the discharge pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. A flue gas pipe is arranged outside the inner furnace. Waste smoke produced by industrial equipment enters the flue gas pipe, and its high temperature heat is released into the inner furnace. Clean water is injected into the inner furnace, and the combustion chamber is ignited and heated. The water gradually heats up in the inner furnace. In addition to being heated by ignition in the combustion chamber, the water in the inner furnace is also assisted in heating by the heat released by the flue gas pipe, thereby improving the efficiency of heating the water in the inner furnace to boiling.

[0014] 2. A capillary is provided in the inner furnace, and the moisture in the inner furnace penetrates into the capillary through the injection hole. The diameter of the capillary is much smaller than the diameter of the inner furnace, and the heating time of the moisture in the capillary is better than the heating time of the moisture in the inner furnace. The moisture in the capillary boils in advance and generates steam in advance. The steam from the capillary enters the second steam exhaust pipe, and then enters the secondary utilization pipe from the second steam exhaust pipe, and becomes water droplets with heat in the secondary utilization pipe, and is discharged into the flue pipe through the precipitation hole, and then falls into the second cavity through the dust reduction hole on the flue pipe. Since the second cavity surrounds the periphery of the first cavity, and the first cavity is heated in advance by the flue pipe, these water droplets containing heat will also release heat to the first cavity when they fall into the second cavity, and assist the flue pipe to reapply the waste heat to the heating of the inner furnace, so that the heating efficiency of the water in the inner furnace is further improved. Industrial waste gas is applied to assist the inner furnace, so that the water in the inner furnace is quickly heated to boiling, which assists the single heating method of the combustion chamber, improves the heating efficiency, saves biomass particles, and achieves energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the external structure of an energy-saving steam generator provided in an embodiment of the present invention;

[0016] Figure 2 The energy-saving steam generator provided by the embodiment of the present invention comprises Figure 1 A schematic diagram from another perspective;

[0017] Figure 3 A schematic diagram of the internal structure of an energy-saving steam generator after being cut open according to an embodiment of the present invention;

[0018] Figure 4 The energy-saving steam generator provided by the embodiment of the present invention comprises Figure 3 The enlarged schematic diagram of the A part is shown;

[0019] Figure 5 A schematic diagram of an energy-saving steam generator provided in an embodiment of the present invention after being cut open from a three-dimensional perspective;

[0020] Figure 6 The energy-saving steam generator provided by the embodiment of the present invention comprises Figure 5 A schematic diagram from another rotating perspective;

[0021] Figure 7 The energy-saving steam generator provided by the embodiment of the present invention comprises Figure 6 The enlarged schematic diagram of the B part is shown;

[0022] Figure 8 A schematic diagram of partial components of an energy-saving steam generator provided in an embodiment of the present invention.

[0023] In the figure: 1. furnace body; 2. inner furnace; 3. outer furnace; 4. first clamping chamber; 5. flue gas pipe; 6. flue pipe; 7. dust suppression hole; 8. second clamping chamber; 9. discharge pipe; 10. first steam discharge pipe; 11. first valve; 12. capillary; 13. second steam discharge pipe; 14. secondary utilization pipe; 15. precipitation hole; 16. partition; 17. filter cover; 18. dust suppression chamber; 19. combustion chamber; 20. heat collecting cover; 21. water inlet pipe; 22. second valve; 23. spray pipe; 24. nozzle; 25. through hole; 26. lifting rod; 27. lifting ring; 28. storage chamber; 29. ​​spring; 30. carrier plate; 31. injection hole. DETAILED DESCRIPTION

[0024] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0025] In one embodiment, Figure 1-Figure 8 As shown:

[0026] The present embodiment provides an energy-saving steam generator, including a furnace body 1 and an auxiliary heating mechanism arranged in the furnace body 1, a partition 16 is fixed in the furnace body 1, an inner furnace 2 and an outer furnace 3 are fixed on the partition 16, the outer furnace 3 is sleeved outside the inner furnace 2 and forms a first clamping cavity 4 between the inner furnace 2, the auxiliary heating mechanism includes a flue gas pipe 5 filled in the first clamping cavity 4, and also includes a flue pipe 6 arranged above the inner furnace 2 and the outer furnace 3, a dust reduction hole 7 is opened at the bottom of the flue pipe 6, an air inlet end of the flue gas pipe 5 passes through the outside of the furnace body 1, and an air outlet end of the flue gas pipe 5 is connected to the flue gas pipe 6, a second clamping cavity 8 is formed between the outer furnace 3 and the cavity wall of the furnace body 1, the dust reduction hole 7 is vertically above the second clamping cavity 8 and communicates with the second clamping cavity 8 up and down, and an exhaust is installed from the inside of the second clamping cavity 8 to the outside of the furnace body 1 Tube 9, the auxiliary heating mechanism also includes a first steam exhaust pipe 10 installed at the top of the inner furnace 2, a first valve 11 is installed on the first steam exhaust pipe 10, the first steam exhaust pipe 10 extends upward to the outside of the furnace body 1, the auxiliary heating mechanism also includes a thin tube 12 installed in the inner furnace 2, a second steam exhaust pipe 13 is installed on the thin tube 12, a secondary utilization pipe 14 is installed in the flue pipe 6, the other end of the second steam exhaust pipe 13 enters the flue pipe 6 and is connected to the secondary utilization pipe 14, a precipitation hole 15 which is connected to the dust removal hole 7 at the bottom of the secondary utilization pipe 14, a second valve 22 is installed on the second steam exhaust pipe 13, the rated opening pressure of the second valve 22 is less than the rated opening pressure of the first valve 11, and a plurality of injection holes 31 are opened on the thin tube 12.

[0027] A plurality of injection holes 31 are arranged at the bottom end of the capillary 12 . The capillary 12 is vertically arranged in the inner furnace 2 and coincides with the axis of the inner furnace 2 . The water inlet pipe 21 enters the furnace body 1 from the outside of the furnace body 1 and is connected to the inner furnace 2 .

[0028] The flue gas pipe 5 is a spiral pipe, and the spiral direction of the flue gas pipe 5 is closely attached to the outer wall of the inner furnace 2 along the height direction of the clamping cavity 4 .

[0029] A filter cover 17 is installed on the discharge pipe 9 , and the filter cover 17 is fixed on the top surface of the partition 16 .

[0030] The flue pipe 6 is a rectangular tube, which surrounds the outer periphery of the outer furnace 3. The secondary utilization pipe 14 is a circular tube, which surrounds the flue pipe 6. A dust reduction chamber 18 is formed between the tube wall of the secondary utilization pipe 14 and the inner wall of the tube cavity of the flue pipe 6.

[0031] A carrier plate 30 is fixed in the second clamping cavity 8, and a through hole 25 is opened on the carrier plate 30. The auxiliary heating mechanism also includes a lifting rod 26 assembled in the through hole 25. A lifting ring 27 is installed on the top of the lifting rod 26. The lifting ring 27 is located in the second clamping cavity 8 and can complete the lifting action along the height direction of the second clamping cavity 8. A storage cavity 28 is provided on the top of the lifting ring 27. A spring 29 is arranged on the top surface of the partition 16. The spring 29 is sleeved on the lifting rod 26. The bottom end of the spring 29 is elastically supported on the top surface of the partition 16, and the top end of the spring 29 is elastically supported on the bottom surface of the lifting ring 27. The opening of the storage cavity 28 faces upward and faces the nozzle 24 and the dust reduction hole 7. When the lifting ring 27 descends to the bottom of the discharge pipe 9, the sewage dripping in the storage cavity 28 is discharged outward through the discharge pipe 9.

[0032] Working principle and effect: The air inlet end of the flue gas pipe 5 is connected to the exhaust gas pipe of the industrial equipment (such as a boiler), and the industrial exhaust gas is discharged into the flue gas pipe 5. The flue gas pipe 5 generates high temperature, and the high temperature heat is released into the first clamping cavity 4, and then released into the inner furnace 2 through the first clamping cavity 4. The water inlet pipe 21 injects water into the inner furnace 2, and the combustion chamber 19 is ignited and heated. The water gradually heats up in the inner furnace 2. In addition to being ignited and heated by the combustion chamber 19, the water in the inner furnace 2 is also assisted by the heat released by the flue gas pipe 5, thereby improving the efficiency of heating the water in the inner furnace 2 to boiling. Since the capillary 12 is located in the inner furnace 2, the water in the inner furnace 2 penetrates into the capillary 12 through the injection hole 31. Since the diameter of the capillary 12 is much smaller than the diameter of the inner furnace 2, when the water in the inner furnace 2 is heated, the water in the capillary 12 will also be heated , and the temperature rise time of the water in the capillary 12 is better than that of the water in the inner furnace 2. The water in the capillary 12 boils in advance and generates steam in advance. The steam in the capillary 12 enters the second steam exhaust pipe 13, and then enters the secondary utilization pipe 14 from the second steam exhaust pipe 13. In the secondary utilization pipe 14, it becomes water droplets with heat, and is discharged into the flue pipe 6 through the precipitation hole 15, and then falls into the second cavity 8 through the dust reduction hole 7 on the flue pipe 6. Since the second cavity 8 surrounds the periphery of the first cavity 4, and the first cavity 4 is heated in advance by the flue pipe 5, these water droplets containing heat will also release heat into the first cavity 4 when they fall into the second cavity 8, which is equivalent to assisting the flue pipe 5 to reapply the waste heat to the heating of the inner furnace 2, so that the heating efficiency of the water in the inner furnace 2 is further improved. When the water in the inner furnace 2 is heated to boiling, steam is generated, and the steam pressure pushes open the first valve 11, and finally discharged to the required equipment through the first steam discharge pipe 10. The industrial waste gas is applied to assist the inner furnace 2, so that the water in the inner furnace 2 is quickly heated to boiling, and the single heating method of the combustion chamber 19 is assisted, which improves the heating efficiency, saves biomass particles, and achieves energy saving.

[0033] A combustion chamber 19 is installed at the bottom of the partition 16, and a heat collecting cover 20 is fixed to the bottom of the inner furnace 2. The bottom end of the capillary 12 extends into the heat collecting cover 20 and is connected to the heat collecting cover 20 from top to bottom. The heat collecting cover 20 is a trumpet cover that gradually becomes thicker from the top to the bottom, and the combustion chamber 19 is located at the bottom side of the heat collecting cover 20. According to the working principle of the existing steam generator, after the biomass particles enter the combustion chamber 19 and are ignited, they can heat the inner furnace 2. The present invention not only directly heats the inner furnace 2 through the combustion chamber 19, but also uses the industrial waste gas introduced into the flue gas pipe 5 to apply the waste heat to the heating of the inner furnace 2, saving energy. And after the heat collecting cover 20 collects heat in a short time, it collects the heat into the capillary 12 in a short time, so that the water in the capillary 12 reaches the boiling point in advance. The capillary tube 12 provides steam to the second steam discharge pipe 13 in advance, and the steam is applied to the secondary utilization pipe 14 in advance, and acts on the second clamping cavity 8 in advance to assist the flue gas pipe 5 in heating the inner furnace 2.

[0034] In addition, after the high-temperature exhaust gas in the flue pipe 5 is input and applied to assist the heating of the inner furnace 2, its outlet end is connected to the flue pipe 6, and the exhaust gas finally enters the flue pipe 6. Since the secondary utilization pipe 14 is also located in the flue pipe 6, and since the second steam exhaust pipe 13 discharges steam to the secondary utilization pipe 14 in advance, and this part of the steam is discharged to the outside through the precipitation hole 15, part of the steam is directly discharged into the second clamping cavity 8, and part of the steam is discharged into the flue pipe 6. After being collected by the dust reduction chamber 18 in the flue pipe 6, it acts on the exhaust gas to neutralize the exhaust gas. For example, the steam is converted into water droplets and discharged into the dust reduction chamber 18, and then part of the steam is discharged by the dust reduction chamber 18. The spray pipe 23 on the dust hole 7 falls into the second clamping chamber 8, which not only completes the dust reduction treatment of the exhaust gas in the second clamping chamber 8, but also drops the heat in the exhaust gas in the form of water droplets into the storage chamber 28 on the top of the lifting ring 27. As the water content in the storage chamber 28 gradually increases, the lifting ring 27 will bring the lifting rod 26 down, and the spring 29 will be compressed and shortened. Since this part of the water comes from steam, and there is heat in the steam (about 80 to 100 degrees), this heat is transferred to the first clamping chamber 4 in the form of water, and then transferred from the first clamping chamber 4 to the inner furnace 2, and then used to heat the water in the inner furnace 2 to accelerate its boiling efficiency. When the storage chamber 28 drops to the position of the discharge pipe 9, the water in the storage chamber 28 is discharged outward through the discharge pipe 9.

[0035] like Figures 3 to 5 As shown, some of the dust reduction holes 7 are installed with spray pipes 23, the spray pipes 23 are vertically downward, and the bottom end of the spray pipes 23 is installed with a nozzle 24 inclined to one side, and some of the dust reduction holes 7 are not installed with spray pipes 23. The dust reduction holes 7 without spray pipes 23 are used for normal discharge of smoke when the smoke pipe 5 is discharged at one end in the flue pipe 6. The dust reduction holes 7 with spray pipes 23 are used to discharge the steam injected from the second steam discharge pipe 13 to the above-mentioned smoke, so that the smoke falls into the dust reduction chamber 18 after reasonable dust reduction and heat absorption.

[0036] like Figure 3 As shown, a filter cover 17 is installed on the exhaust pipe 9 to intercept impurities in the smoke, and can be reused after regular removal and cleaning.

[0037] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0038] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Energy-saving steam generator, characterized in that: The invention comprises a furnace body (1) and an auxiliary heating mechanism arranged in the furnace body (1); a partition (16) is fixed in the furnace body (1); an inner furnace (2) and an outer furnace (3) are fixed on the partition (16); the outer furnace (3) is sleeved outside the inner furnace (2) and forms a first cavity (4) with the inner furnace (2); the auxiliary heating mechanism comprises a smoke pipe (5) filled in the first cavity (4), and also comprises a smoke duct arranged above the inner furnace (2) and the outer furnace (3). The flue pipe (6) is provided with a dust removal hole (7) at the bottom thereof, the air inlet end of the flue pipe (5) penetrates outside the furnace body (1), the air outlet end of the flue pipe (5) is connected to the flue pipe (6), a second cavity (8) is formed between the outer furnace chamber (3) and the cavity wall of the furnace body (1), the dust removal hole (7) is vertically located above the second cavity (8) and communicates with the second cavity (8) from top to bottom, and a dust removal hole (7) is installed from the inside of the second cavity (8) to the outside of the furnace body (1). The auxiliary heating mechanism further comprises a first steam discharge pipe (10) installed at the top of the inner furnace (2), a first valve (11) being installed on the first steam discharge pipe (10), the first steam discharge pipe (10) penetrating upward to the outside of the furnace body (1), the auxiliary heating mechanism further comprises a thin pipe (12) installed in the inner furnace (2), a second steam discharge pipe (13) being installed on the thin pipe (12), and a secondary utilization pipe (14) being installed in the flue pipe (6). ), the other end of the second steam exhaust pipe (13) enters the flue pipe (6) and is connected to the secondary utilization pipe (14), the bottom of the secondary utilization pipe (14) is provided with a precipitation hole (15) which is in communication with the dust removal hole (7) from top to bottom, the second steam exhaust pipe (13) is provided with a second valve (22), the rated opening pressure of the second valve (22) is less than the rated opening pressure of the first valve (11), and the capillary tube (12) is provided with a plurality of injection holes (31).

2. The energy-saving steam generator according to claim 1, characterized in that: A plurality of injection holes (31) are arranged at the bottom end of the capillary (12); the capillary (12) is vertically arranged in the inner furnace (2) and coincides with the axis of the inner furnace (2); and a water inlet pipe (21) enters the furnace body (1) from the outside of the furnace body (1) and is connected to the inner furnace (2).

3. The energy-saving steam generator according to claim 2, characterized in that: The flue gas pipe (5) is a spiral tube, and the spiral direction of the flue gas pipe (5) is closely attached to the outer wall of the inner furnace (2) along the height direction of the clamping cavity (4).

4. The energy-saving steam generator according to claim 3, characterized in that: A filter cover (17) is installed on the discharge pipe (9), and the filter cover (17) is fixed on the top surface of the partition (16).

5. The energy-saving steam generator according to claim 4, characterized in that: The flue pipe (6) is a rectangular pipe, and the flue pipe (6) surrounds the outer periphery of the outer furnace (3); the secondary utilization pipe (14) is a circular pipe, and the secondary utilization pipe (14) surrounds the inside of the flue pipe (6); a dust reduction chamber (18) is formed between the tube wall of the secondary utilization pipe (14) and the inner wall of the tube cavity of the flue pipe (6).

6. The energy-saving steam generator according to claim 5, characterized in that: A combustion chamber (19) is installed at the bottom of the partition (16), a heat collecting cover (20) is fixed to the bottom of the inner furnace (2), the bottom end of the capillary (12) extends into the heat collecting cover (20) and is connected to the heat collecting cover (20) from top to bottom, the heat collecting cover (20) is a trumpet cover that gradually becomes thicker from the top to the bottom, and the combustion chamber (19) is located on the bottom side of the heat collecting cover (20).

7. The energy-saving steam generator according to claim 6, characterized in that: A spray pipe (23) is installed on some of the dust removal holes (7), the spray pipe (23) is vertically downward, and a spray head (24) inclined to one side is installed at the bottom end of the spray pipe (23).

8. The energy-saving steam generator according to claim 7, characterized in that: A carrier plate (30) is fixed in the second clamping cavity (8), and a through hole (25) is opened on the carrier plate (30). The auxiliary heating mechanism also includes a lifting rod (26) assembled in the through hole (25), and a lifting ring (27) is installed on the top of the lifting rod (26). The lifting ring (27) is located in the second clamping cavity (8) and can complete the lifting action along the height direction of the second clamping cavity (8). The top of the lifting ring (27) is provided with a storage cavity (28). The top surface of the partition (16) is provided with A spring (29), wherein the spring (29) is sleeved on the lifting rod (26), the bottom end of the spring (29) is elastically supported on the top surface of the partition (16), and the top end of the spring (29) is elastically supported on the bottom surface of the lifting ring (27), the opening of the storage chamber (28) faces upward and faces the nozzle (24) and the dust removal hole (7), and when the lifting ring (27) descends to the bottom of the discharge pipe (9), the sewage dripping into the storage chamber (28) is discharged outward through the discharge pipe (9).

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