Multi-energy driven air source heat pump

Abstract

The invention relates to the technical field of air source heat pumps, in particular to a multi-energy-driven air source heat pump which comprises solar energy, an air pump, a water storage tank and an air inlet assembly, the air inlet assembly is connected to the front end of the air pump, and the air inlet assembly comprises a heating pipe, a condensation pipe, an air inlet sleeve, a front heating cavity, a condensation cavity and a rear heating cavity. The air inlet sleeve is connected to the front side of the air pump, and the front heating cavity and the rear heating cavity are formed in the front end and the rear end of the air inlet sleeve respectively. According to the air conditioner, the front heating cavity in the air inlet assembly is arranged to heat air just entering the air conditioner for the first time, so that when the air is condensed and dried by a refrigerant in the condensation cavity, moisture in the air is more easily condensed into water drops, and finally the air is heated through the rear heating cavity; therefore, air entering the air pump is in a warm and dry state, and the phenomenon that a water film is formed on the surface of the evaporator in winter, and consequently the heat exchange effect of air and the evaporator is affected is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and in particular to a multi-energy driven air source heat pump. Background Art

[0002] An air source heat pump is a heat pump that absorbs heat from the air for heating. It is a device that works based on the reverse Carnot cycle principle. It consists of four components: an evaporator, a condenser, a compressor, and an expansion valve. When working, the evaporator first absorbs heat from the air to evaporate the low-temperature and low-pressure refrigerant into a gas. Then, the refrigerant that has been evaporated into a gas enters the compressor, where its temperature and pressure are increased. Next, the high-temperature and high-pressure gaseous refrigerant enters the condenser, where it releases heat by contacting the cooling medium in the heating system or hot water system, causing the refrigerant to cool and become liquid. Finally, the refrigerant enters the expansion valve, where the pressure and temperature are reduced, and then it enters the evaporator again, repeating the cycle.

[0003] In the prior art, air source heat pumps are combined with solar energy to achieve multi-energy heating to reduce electricity consumption. At the same time, the heat generated by solar energy can be used to defrost the surface of the evaporator. By injecting hot water heated by solar energy into the inner wall of the evaporator, the temperature of the evaporator itself is increased, thereby avoiding surface frost. At the same time, the refrigerant at the compressor inlet can be preheated. However, in winter, the outside air temperature is low. After the evaporator's own temperature rises, when it comes into contact with colder air, condensation water is likely to appear on the surface, forming a layer of water film, thereby affecting the heat exchange effect between the air and the evaporator.

[0004] To this end, a multi-energy driven air source heat pump is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-energy driven air source heat pump. In order to solve the problem that during the defrosting process of the air source heat pump, condensed water forms a layer of water film on the surface of the evaporator, thereby affecting and reducing the heat exchange effect between the air and the evaporator, the incoming air is heated, condensed and then heated by the air intake component, so that the incoming air is in a warm and dry state, thereby avoiding the formation of condensed water on the evaporator surface.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-energy driven air source heat pump comprises solar energy, an air pump, a water storage tank and an air intake assembly, wherein the air intake assembly is connected to the front end of the air pump, the air intake assembly comprises a heating pipe, a condensing pipe, an air intake sleeve, a front heating chamber, a condensing chamber and a rear heating chamber, the air intake sleeve is connected to the front side of the air pump, the front heating chamber and the rear heating chamber are respectively arranged at the front and rear ends of the air intake sleeve, the condensing chamber is arranged between the front heating chamber and the rear heating chamber, the heating pipe is connected to the interior of the front heating chamber and the rear heating chamber, the condensing pipe is connected to the interior of the condensing chamber, the air pump comprises an evaporator, an outer shell and a liquid storage tank, the evaporator is connected to the rear side of the inner wall of the outer shell, the liquid storage tank is located on the right side of the evaporator, the outside air is sucked into the air pump through the air intake assembly, the refrigerant discharged from the liquid storage tank enters the condensing chamber and condenses and dries the air inside the condensing pipe, the water heated by solar energy enters the front heating chamber and the rear heating chamber and heats the air inside the heating pipe, the heated air enters the interior of the air pump and contacts with the evaporator.

[0008] In the above scheme, the air first enters the heating tube inside the front heating chamber, and the front heating chamber heats the newly entered air for the first time, so that the air temperature rises and part of the water evaporates, and then enters the condensing tube, and the heated gas is condensed and dried by the refrigerant inside the condensing chamber to remove the moisture in the air, and finally enters the heating tube inside the rear heating chamber, and the air is heated by the rear heating chamber, so that the gas entering the air pump is in a warm and dry state.

[0009] Preferably, the air pump also includes a compressor, a heat exchanger and a partition, the heat exchanger is connected to the right side of the inner wall of the shell, the compressor is connected between the evaporator and the heat exchanger, the heat exchanger is connected to the liquid storage tank, the partition is located between the compressor and the evaporator, and the partition is located between the evaporator and the compressor.

[0010] In the above scheme, the interior of the air pump is divided into two parts by a partition, which reduces the flow space of hot air. At the same time, the hot air only exchanges heat with the refrigerant inside the evaporator and the air intake component, thereby achieving the effect of reducing heat loss.

[0011] Preferably, the air intake assembly further includes a fan blade and a water accumulation chamber, the water accumulation chamber is located between the condensation chamber and the front heating chamber, and the fan blade is located on the front side of the evaporator.

[0012] In the above scheme, the condensed water is discharged through the water accumulation chamber, and the front heating chamber is separated from the condensing chamber to avoid direct heat exchange between hot water and refrigerant.

[0013] Preferably, a slip ring is provided on the outer wall of the fan blade, and the slip ring is slidably connected to the inner wall of the air inlet sleeve.

[0014] In the above scheme, the fan blades and the air inlet sleeve form a structure similar to that of a fan through the slip ring, thereby improving the air suction capacity of the fan blades.

[0015] Preferably, the length of the front heating chamber is equal to the length of the condensing chamber, and the length of the rear heating chamber is equal to twice the length of the condensing chamber.

[0016] In the above scheme, the residence time of air in the post-heating chamber is increased, thereby improving the heating effect.

[0017] Preferably, a heat-insulating chamber is provided between the condensing chamber and the post-heating chamber, and a drain pipe is connected to the bottom of the heat-insulating chamber.

[0018] In the above scheme, heat exchange between hot water and refrigerant is avoided.

[0019] Preferably, a drainage groove is provided at the bottom of the water accumulation chamber, and the drainage pipe is connected to the drainage groove.

[0020] In the above scheme, the condensed water is discharged through the drainage trough, and the condensed water is discharged into the heat exchanger through the drainage pipe to be heated for use by users.

[0021] Preferably, the inner wall of the air pump is connected to an exhaust component, which includes an exhaust cavity, an exhaust inlet, and an exhaust outlet. The exhaust cavity is opened at the bottom and rear side of the inner wall of the air pump, and the cross-section is set to be L-shaped. The exhaust inlet is opened at the bottom of the inner wall of the air pump, and the exhaust outlet is opened at the rear side of the outer wall of the air pump.

[0022] In the above scheme, the residence time of hot air inside the air pump is prolonged by the exhaust component, and the hot air forms a heat preservation layer to improve the heat preservation effect inside the air pump. At the same time, it also contacts the back side of the evaporator to improve the utilization rate of the hot air.

[0023] Preferably, the cross-section of the heating tube is set to be wavy, and the cross-section of the condensing tube is set to be trapezoidal.

[0024] In the above scheme, the flow distance of air in the front heating chamber and the rear heating chamber is increased, thereby increasing the heating time.

[0025] Preferably, the exhaust outlet is in the shape of a horizontal bar, and the opening is inclined downward, and the inner wall of the exhaust outlet is hinged with two inclined plates, and the ends of the two inclined plates are connected.

[0026] In the above solution, the ends of the two inclined plates are connected to form a seal, thereby preventing cold air from entering from the exhaust outlet when not in operation.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. An air intake assembly is provided in which the front heating chamber and the rear heating chamber are connected with solar energy, so that the temperature of the front heating chamber and the rear heating chamber is relatively high, and the condensing chamber is connected with the liquid storage tank, so that the temperature of the condensing chamber is relatively low. The air that has just entered is heated for the first time by the front heating chamber, so that when the air is condensed and dried by the refrigerant inside the condensing chamber, the moisture in the air is more easily condensed into water droplets, and finally the air is heated by the rear heating chamber, so that the gas entering the air pump is in a warm and dry state, thereby avoiding the formation of a layer of water film on the surface of the evaporator in winter, which affects the heat exchange effect between the air and the evaporator.

[0029] 2. By setting up an exhaust component, the flow distance of the hot air inside the air pump is extended through the exhaust component, thereby increasing the residence time of the air inside the air pump, thereby improving the utilization rate of the hot air. At the same time, when the hot air flows inside the exhaust chamber, an insulation layer is formed, which improves the insulation effect inside the air pump. At the same time, it also contacts the back side of the evaporator to improve the utilization rate of the hot air.

[0030] 3. By setting up a water accumulation chamber, the front heating chamber is isolated from the condensing chamber, thereby avoiding heat exchange between the hot water in the front heating chamber and the refrigerant in the condensing chamber, which causes the heat in the hot water to be absorbed by the refrigerant and causes a large amount of heat loss in the hot water. At the same time, the water in the water accumulation chamber is discharged to the heat exchanger through the drain pipe, heated and stored in the water tank, thereby increasing the utilization rate of the condensed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the connection relationship diagram structure of the present invention;

[0032] Figure 2 A front view of the air pump of the present invention;

[0033] Figure 3 It is a schematic diagram of the AA cross-sectional structure of the present invention;

[0034] Figure 4 It is a schematic diagram of the fan blade structure of the present invention;

[0035] Figure 5 It is a schematic diagram of the BB cross-sectional structure of the present invention;

[0036] Figure 6 It is a schematic diagram of air flow of the present invention;

[0037] Figure 7 It is a schematic diagram of hot water flow of the present invention;

[0038] Figure 8 It is a schematic diagram of the refrigerant flow of the present invention.

[0039] In the figure: 1. solar energy; 2. air pump; 201. evaporator; 202. shell; 203. compressor; 204. heat exchanger; 205. liquid storage tank; 206. partition; 3. water storage tank; 4. air intake assembly; 401. heating tube; 402. condenser; 403. air intake sleeve; 404. fan blade; 405. front heating chamber; 406. water accumulation chamber; 407. condenser chamber; 408. rear heating chamber; 409. insulation chamber; 5. slip ring; 6. drain groove; 7. exhaust assembly; 701. exhaust chamber; 702. exhaust inlet; 703. exhaust outlet; 704. inclined plate; 8. drain pipe. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention, and combine the working state to make its structural features more detailed. Obviously, the described embodiments are only 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 making creative work are within the scope of protection of the present invention.

[0041] See also Figures 1 to 8 The present invention provides a multi-energy driven air source heat pump, and the technical solution is as follows:

[0042] A multi-energy driven air source heat pump, referring to Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8, including solar energy 1, air pump 2, water tank 3, air intake assembly 4, the air intake assembly 4 is connected to the front end of the air pump 2, the air intake assembly 4 includes a heating pipe 401, a condensing pipe 402, an air intake sleeve 403, a front heating chamber 405, a condensing chamber 407 and a rear heating chamber 408, the air intake sleeve 403 is connected to the front side of the air pump 2, the front heating chamber 405 and the rear heating chamber 408 are respectively opened at the front and rear ends of the air intake sleeve 403, the condensing chamber 407 is opened between the front heating chamber 405 and the rear heating chamber 408, the heating pipe 401 is connected to the inside of the front heating chamber 405 and the rear heating chamber 408, the condensing pipe 402 is connected to the inside of the condensing chamber 407, the front heating chamber 405, the condensing chamber 407 and the rear heating chamber 408 are mutually connected through the heating pipe 401 and the condensing pipe 402 The air pump 2 includes an evaporator 201, a shell 202 and a liquid storage tank 205. The evaporator 201 is connected to the rear side of the inner wall of the shell 202, and the liquid storage tank 205 is located on the right side of the evaporator 201. The liquid storage tank 205 and the evaporator 201 are interconnected. The outside air is sucked into the air pump 2 through the air intake component 4, and the refrigerant discharged from the liquid storage tank 205 enters the condensing chamber 407, and condenses and dries the air inside the condensing tube 402. The water heated by solar energy 1 enters the front heating chamber 405 and the rear heating chamber 408, and heats the air inside the heating tube 401. The heated air enters the air pump 2 and contacts the evaporator 201. The air first passes through the front heating chamber 405 and then enters the condensing tube 402, which makes it easier to condense the moisture in the air.

[0043] As an embodiment of the present invention, refer to Figure 3The air pump 2 further includes a compressor 203, a heat exchanger 204 and a partition 206. The heat exchanger 204 is connected to the right side of the inner wall of the shell 202. The compressor 203 is connected between the evaporator 201 and the heat exchanger 204. The heat exchanger 204 is communicated with the liquid storage tank 205. The partition 206 is located between the compressor 203 and the evaporator 201. The partition 206 is located between the evaporator 201 and the compressor 203. The refrigerant circulates continuously between the evaporator 201, the compressor 203, the heat exchanger 204, the liquid storage pipe, and the condensation chamber 407. The evaporator 201 and the condensation chamber 407 are separated from the compressor 203, the heat exchanger 204 and the liquid storage pipe by the partition 206, thereby reducing the diffusion volume of the hot air in the air pump 2. , making it easier for the space where the evaporator 201 is installed to be heated and heated by the hot air, while allowing the air to exchange heat only with the evaporator 201 and the refrigerant inside the condensation chamber 407. In the prior art, the refrigerant will directly enter the evaporator 201 after being discharged from the liquid storage tank 205. In this solution, a condensation chamber 407 is connected between the heat exchanger 204 and the liquid storage tank 205, so that the air is condensed and dried while also exchanging heat with the refrigerant to absorb the heat of the first heating. When the air heated again by the second heating chamber enters the air pump 2, it only contacts the evaporator 201 under the isolation of the partition 206, thereby preventing the heat of the air from being absorbed by the compressor 203, the heat exchanger 204 and the refrigerant inside the liquid storage tank 205, thereby avoiding heat damage.

[0044] As an embodiment of the present invention, refer to Figure 3 The air intake component 4 also includes a fan blade 404 and a water accumulation chamber 406. The water accumulation chamber 406 is located between the condensing chamber 407 and the front heating chamber 405. The front heating chamber 405 is isolated from the condensing chamber 407 by the water accumulation chamber 406, thereby avoiding the heat exchange between the hot water inside the front heating chamber 405 and the refrigerant inside the condensing chamber 407, resulting in the heat in the hot water being absorbed by the refrigerant, resulting in a large heat loss of the hot water. The fan blade 404 is located on the front side of the evaporator 201, and the outside air is sucked into the air pump 2 through the rotation of the fan blade 404. An insulating chamber 409 is opened between the condensing chamber 407 and the rear heating chamber 408.

[0045] As an embodiment of the present invention, refer to Figure 4 The outer wall of the fan blade 404 is provided with a slip ring 5, and the slip ring 5 is slidably connected to the inner wall of the air intake sleeve 403. The edge of the fan blade 404 is connected to the inner wall of the air intake sleeve 403 through the slip ring 5, thereby eliminating the gap between the edge of the fan blade 404 and the inner wall of the air intake sleeve 403, so that the fan blade 404 and the air intake sleeve 403 form a fan-like structure, thereby improving the air suction ability of the fan blade 404 when rotating, increasing the circulation rate of the air inside the air pump 2, and exhausting the hot air before cooling, so that the evaporator 201 is in a warm environment.

[0046] As an embodiment of the present invention, refer to Figure 3 The length of the front heating chamber 405 is equal to the length of the condensing chamber 407, and the length of the rear heating chamber 408 is equal to twice the length of the condensing chamber 407, so that the air stays in the rear heating chamber 408 for a longer time, thereby improving the heating effect of the air.

[0047] As an embodiment of the present invention, refer to Figure 3 and Figure 5 An insulating chamber 409 is provided between the condensing chamber 407 and the post-heating chamber 408, and a drain pipe 8 is connected to the bottom of the insulating chamber 409. The insulating chamber 409 separates the condensing chamber 407 and the post-heating chamber 408, thereby avoiding heat exchange between the hot water in the post-heating chamber 408 and the refrigerant in the condensing chamber 407. The drain pipe 8 is connected to the drain groove 6, and the drain pipe 8 is connected to the heat exchanger 204. The condensed water is discharged through the drain groove 6 to avoid accumulation in the water chamber 406, and then the cooling water is discharged to the heat exchanger 204 through the drain pipe 8, heated in the heat exchanger 204 and stored in the water storage tank 3, thereby increasing the utilization rate of the condensed water.

[0048] As an embodiment of the present invention, refer to Figure 5 The inner wall of the air pump 2 is connected to an exhaust component 7, and the exhaust component 7 includes an exhaust cavity 701, an exhaust inlet 702, and an exhaust outlet 703. The exhaust cavity 701 is opened at the bottom and rear side of the inner wall of the air pump 2, and the cross section is set to be L-shaped. When the air flows inside the exhaust cavity 701, a heat preservation layer is formed, thereby improving the heat preservation effect inside the air pump 2 and avoiding frosting on the surface of the evaporator 201. The exhaust inlet 702 is opened at the bottom of the inner wall of the air pump 2 and close to the front side of the inner wall of the shell 202, thereby increasing the flow distance of the air inside the air pump 2, thereby increasing the residence time of the air inside the air pump 2, thereby improving the utilization rate of the hot air, and the exhaust outlet 703 is opened on the rear side of the outer wall of the air pump 2.

[0049] As an embodiment of the present invention, refer to Figure 6 The cross section of the heating tube 401 is set to be wavy, which increases the flow distance of the air in the front heating chamber 405 and the rear heating chamber 408, thereby increasing the heating time. The cross section of the condensing tube 402 is set to be trapezoidal, so that the condensed water can flow more easily into the water accumulation chamber 406.

[0050] As an embodiment of the present invention, refer to Figure 5The exhaust outlet 703 is in the shape of a horizontal strip, and the opening is inclined downward. Two inclined plates 704 are hinged on the inner wall of the exhaust outlet 703. The ends of the two inclined plates 704 are connected to form a seal, thereby preventing cold air from entering from the exhaust outlet 703 when not working.

[0051] Working principle: The air entering the air pump 2 is condensed, dried and heated through the air intake assembly 4, thereby solving the problem of condensed water gathering on the surface of the evaporator 201 in winter, forming a water film on the surface and affecting the heat exchange effect between the air and the evaporator 201;

[0052] Specifically, when the fan blades 404 rotate, the outside air is sucked into the air pump 2. Before entering the air pump 2, the air first enters the heating tube 401 inside the front heating chamber 405. The front heating chamber 405 is connected to the solar energy 1, so the hot water heated by the solar energy 1 will flow into the front heating chamber 405. The hot water inside the front heating chamber 405 heats the air on the inner wall of the heating tube 401, so that the air temperature increases and part of the moisture in the air is evaporated.

[0053] The heated air then enters the condenser 402. Since the condenser 402 is located inside the condensation chamber 407, and the condensation chamber 407 is connected to the liquid storage tank 205, the refrigerant discharged from the liquid storage tank 205 first flows into the condensation chamber 407 and then flows into the evaporator 201. When the refrigerant flows into the condensation chamber 407, the hot air in the condenser 402 is condensed and dried. Because the air has been heated by the front heating chamber 405, the moisture in the air is more easily condensed into water droplets during condensation.

[0054] Finally, the condensed and dried air enters the heating tube 401 inside the rear heating chamber 408. The rear heating chamber 408 is also connected to the solar energy 1, so there is hot water inside the rear heating chamber 408. The hot water inside the rear heating chamber 408 heats the air in the heating tube 401 and enters the air pump 2 to exchange heat with the evaporator 201.

[0055] After the heat exchange is completed, the gas enters the exhaust chamber 701 through the exhaust inlet 702 and is finally discharged from the exhaust outlet 703 .

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-energy driven air source heat pump, comprising solar energy (1), an air pump (2) and a water storage tank (3), characterized in that: The air intake assembly (4) is also included. The air intake assembly (4) is connected to the front end of the air pump (2). The air intake assembly (4) includes a heating tube (401), a condensing tube (402), an air intake sleeve (403), a front heating chamber (405), a condensing chamber (407) and a rear heating chamber (408). The air intake sleeve (403) is connected to the front side of the air pump (2). The front heating chamber (405) and the rear heating chamber (408) are respectively arranged at the front and rear ends of the air intake sleeve (403). The condensing chamber (407) is arranged between the front heating chamber (405) and the rear heating chamber (408). The heating tube (401) is connected to the inside of the front heating chamber (405) and the rear heating chamber (408). The condensing tube (402) is connected to the condensing chamber (407). 07), the air pump (2) includes an evaporator (201), a housing (202) and a liquid storage tank (205), the evaporator (201) is connected to the rear side of the inner wall of the housing (202), the liquid storage tank (205) is located on the right side of the evaporator (201), and the outside air is sucked into the air pump (2) through the air intake component (4), the refrigerant discharged from the liquid storage tank (205) enters the condensation chamber (407), and condenses and dries the air inside the condensation tube (402), the water heated by solar energy (1) enters the front heating chamber (405) and the rear heating chamber (408), and heats the air inside the heating tube (401), and the heated air enters the air pump (2) and contacts the evaporator (201).

2. A multi-energy driven air source heat pump according to claim 1, characterized in that: The air pump (2) further comprises a compressor (203), a heat exchanger (204) and a partition (206); the heat exchanger (204) is connected to the right side of the inner wall of the outer shell (202); the compressor (203) is connected between the evaporator (201) and the heat exchanger (204); the heat exchanger (204) is connected to a liquid storage tank (205); and the partition (206) is located between the compressor (203) and the evaporator (201).

3. A multi-energy driven air source heat pump according to claim 1, characterized in that: The air intake assembly (4) further comprises a fan blade (404) and a water accumulation chamber (406), wherein the water accumulation chamber (406) is located between the condensation chamber (407) and the front heating chamber (405), and the fan blade (404) is located at the front side of the evaporator (201).

4. A multi-energy driven air source heat pump according to claim 3, characterized in that: The outer wall of the fan blade (404) is provided with a slip ring (5), and the slip ring (5) is slidably connected to the inner wall of the air inlet sleeve (403).

5. The multi-energy driven air source heat pump according to claim 3, characterized in that: The length of the front heating chamber (405) is equal to the length of the condensing chamber (407), and the length of the rear heating chamber (408) is equal to twice the length of the condensing chamber (407).

6. A multi-energy driven air source heat pump according to claim 5, characterized in that: A heat-insulating chamber (409) is provided between the condensing chamber (407) and the post-heating chamber (408), and a drainage pipe (8) is connected to the bottom of the heat-insulating chamber (409).

7. A multi-energy driven air source heat pump according to claim 6, characterized in that: A drainage groove (6) is provided at the bottom of the water accumulation chamber (406), and the drainage pipe (8) is connected to the drainage groove (6).

8. The multi-energy driven air source heat pump according to claim 1, characterized in that: The inner wall of the air pump (2) is connected to an exhaust component (7), and the exhaust component (7) comprises an exhaust cavity (701), an exhaust inlet (702), and an exhaust outlet (703). The exhaust cavity (701) is opened at the bottom and rear side of the inner wall of the air pump (2), and has an L-shaped cross section. The exhaust inlet (702) is opened at the bottom of the inner wall of the air pump (2), and the exhaust outlet (703) is opened at the rear side of the outer wall of the air pump (2).

9. The multi-energy driven air source heat pump according to claim 7, characterized in that: The cross section of the heating tube (401) is configured to be wavy, and the cross section of the condensing tube (402) is configured to be trapezoidal.

10. The multi-energy driven air source heat pump according to claim 8, characterized in that: The exhaust outlet (703) is in the shape of a horizontal strip, and its opening is inclined downward. Two inclined plates (704) are hingedly connected to the inner wall of the exhaust outlet (703), and the ends of the two inclined plates (704) are connected.

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