A steam exhaust structure

Abstract

The present invention relates to a steam exhaust structure, comprising an inner tank with a steam inlet and a steam outlet, and also comprising a condensation chamber with an air inlet and an air outlet, wherein the air inlet is fluidly connected to the steam outlet, and a pressure check valve is arranged on the air outlet. Compared with the prior art, the steam in the inner tank is not directly discharged through an exhaust passage, but enters the condensation chamber, and the condenser is equivalent to a steam overshoot buffer of the inner tank. When a small amount of steam in the inner tank is counteracted, excessive steam will enter the condensation chamber through the steam outlet, effectively achieving the balance of the internal pressure and temperature field of the inner tank. In addition, after the steam in the inner tank enters the condensation chamber, the pressure check valve can only be opened to exhaust air when the internal pressure in the condensation chamber reaches the preset pressure value of the pressure check valve (i.e., the pressure required for the pressure check valve to open), thereby effectively avoiding excessive steam discharge and excessive heat loss.

Description

Technical Field

[0001] The invention relates to the field of electric steamers, and in particular to a steam exhaust structure. Background Art

[0002] In recent years, the proportion of steamed dishes in people's diet has gradually increased, because the cooking method of steaming is more nutritious and healthy, and the steamed food is easier to digest and suitable for the elderly and children. The steam of the existing electric steamer is generally generated by heating a certain amount of water through heat conduction. The mechanism of steam generation determines that the amount of steam entering the inner tank through the inner tank inlet is not controllable. At present, electric steamers generally introduce steam directly into the exhaust duct, and reduce the temperature and humidity of the steam by mixing with the cold air in the exhaust duct. Although the temperature and humidity of the steam discharged from the inner tank can be reduced by the above method, since the inner tank and the exhaust duct are almost directly connected, the steam discharge volume is still large and the heat loss is large. In addition, this external discharge method will also affect the uniformity of the temperature field of the inner tank. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a steam exhaust structure with controllable steam exhaust volume and little influence on the uniformity of the temperature field inside the inner tank in view of the prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a steam exhaust structure, including an inner tank with a steam inlet and a steam outlet, characterized in that it also includes a condensation chamber with an air inlet and an air outlet, the air inlet is fluidly connected to the above steam outlet, and a pressure check valve is arranged on the above air outlet.

[0005] In order to further reduce the steam discharge, the steam discharge structure of the present invention further includes an exhaust channel, and the condensation chamber is arranged on the exhaust channel. In this way, the cold air in the exhaust channel can transfer heat with the steam in the condensation chamber, thereby realizing steam condensation, continuously reducing the steam pressure in the condensation chamber, and making the pressure value in the condensation chamber continuously less than the preset pressure value of the pressure check valve, thereby further reducing the steam discharge.

[0006] The specific arrangement of the above-mentioned condensation chamber in the exhaust channel can have multiple preferred implementation modes, one of which is that the above-mentioned steam discharge device also includes a fan and an air guide hood, the air guide hood includes an air inlet port and an air outlet port, the above-mentioned fan is arranged at the air inlet port, and the air guide hood includes an air guide plate and a bottom plate which are buckled together up and down, the air guide plate and the bottom plate surround the above-mentioned exhaust channel, and the above-mentioned condensation chamber is arranged on the top surface of the air guide plate.

[0007] Preferably, an air outlet pipe is provided on the air outlet, the air outlet pipe is opposite to the air inlet port, and the pressure one-way valve is provided on the air outlet of the air outlet pipe.

[0008] Preferably, the bottom plate is concave downward at a position corresponding to the condensation chamber to form an exhaust lower concave chamber, and at least the outlet end of the outlet pipe and the pressure check valve are arranged in the exhaust lower concave chamber, so that the airflow in the exhaust passage can stay and swirl in the exhaust lower concave chamber, thereby better exchanging heat with the steam discharged from the pressure check valve.

[0009] Preferably, the air guide plate is provided with an upwardly protruding groove, so as to form an exhaust upper concave cavity on the bottom surface of the condensation cavity, so that the airflow in the exhaust channel can stay and swirl in the exhaust upper concave cavity, thereby better transferring heat with the steam in the condensation cavity.

[0010] Furthermore, the upper exhaust cavity and the lower exhaust cavity are offset and opposite to each other, so that the airflows respectively residing in the upper exhaust cavity and the lower exhaust cavity can form convection, further improving the condensation effect of steam.

[0011] Preferably, a guide plate is provided between the pressure check valve and the air inlet port, the air outlet of the pressure check valve is opposite to the guide plate, and an airflow gap is left between the guide plate and the inner wall of the air guide cover. On the one hand, the steam discharged from the pressure check valve directly contacts the guide plate, and at the same time, the airflow in the exhaust channel also directly contacts the guide plate, so that the steam discharged from the pressure check valve is condensed once; on the other hand, when the airflow in the exhaust channel blows over the guide plate, a certain negative pressure area will be formed on its back side (i.e., the side facing the pressure check valve), so that the steam discharged from the pressure check valve can form a vortex with the cold air, so that the steam and air are fully mixed, and the steam is condensed twice, so as to further reduce the discharge of steam.

[0012] Preferably, the guide plate is an arc-shaped plate, the airflow gap is formed between its upper end and the air guide plate, the lower end is fixed to the bottom plate, and the air outlet of the pressure one-way valve is opposite to the inner concave surface of the guide plate.

[0013] When the whole machine is working normally, the condensation chamber and the inner tank will form a relatively closed space. If the steam in the condensation chamber continues to condense and there is not enough steam replenishment at the steam inlet, the above-mentioned relatively closed space may gradually form a negative pressure space, resulting in the door of the electric steamer being unable to open or other safety hazards. In order to avoid the above problems, an air replenishment port is provided on the inner tank, and an air replenishment check valve that can control the opening and closing of the air replenishment port is provided on the air replenishment port. In this way, when a negative pressure space is formed in the condenser, the air replenishment check valve opens, and the outside air is replenished into the condensation chamber, thereby avoiding the occurrence of the above problems and ensuring the safe use of the electric steamer.

[0014] Compared with the prior art, the advantages of the present invention are: the condensation chamber is connected to the inner tank fluid through the air inlet, so that the steam in the inner tank is not directly discharged through the exhaust channel, but enters the condensation chamber, and the condenser is equivalent to a steam overshoot buffer of the inner tank. When a small amount of steam in the inner tank is counteracted, excessive steam will enter the condensation chamber through the steam outlet. Compared with the existing direct discharge method, the balance of the internal pressure and temperature field of the inner tank is effectively achieved. In addition, a pressure check valve that can control the opening and closing of the air outlet is provided on the air outlet, so that after the steam in the inner tank enters the condensation chamber, only when the internal pressure in the condensation chamber reaches the preset pressure value of the pressure check valve (i.e., the pressure required for the pressure check valve to open), the pressure check valve can be opened to exhaust, thereby effectively avoiding excessive steam discharge and excessive heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of the steam exhaust structure in an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0017] Figure 3 A schematic diagram of a partial structure of a steam exhaust structure in an embodiment of the present invention;

[0018] Figure 4 for Figure 3 A schematic diagram of the structure in another direction;

[0019] Figure 5 An exploded view of a local structure in an embodiment of the present invention;

[0020] Figure 6 for Figure 3 Cross-sectional view along AA direction;

[0021] Figure 7 for Figure 6 Enlarged view of part I. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings.

[0023] like Figures 1 to 7 As shown, a steam exhaust structure is applied to an electric steamer, which includes an inner pot 1, a condensation chamber 2 and an exhaust channel 40.

[0024] The exhaust passage 40 is arranged at the top of the inner container 1. Specifically, the steam exhaust structure further includes a fan 3 (a cross-flow fan in this embodiment) and an air guide hood 4. The air guide hood 4 includes an air inlet port 401 and an air outlet port 402. The fan 3 is arranged in the air inlet port 401. Further, the air guide hood 4 includes an air guide plate 41 and a bottom plate 42 that are buckled up and down. The air guide plate 41 is in an upward bulge shape, and the bottom plate 42 is in a flat plate shape. The cavity surrounded by the two forms the exhaust passage 40.

[0025] The inner pot 1 is provided with a steam inlet 11 and a steam outlet 12 on its wall, and the condensation chamber 2 is provided with an air inlet 21, an air outlet 22, an air supply port 23 and a drain port 24 on its wall. The steam inlet 11 is connected to the steam outlet of the steam generator of the electric steamer through a pipeline, so that the steam generated by the steam generator can enter the inner pot 1. The steam outlet 12 is fluidly connected to the air inlet 21, so that the steam in the inner pot 1 is not directly discharged through the exhaust channel 40, but enters the condensation chamber 2. The condensation chamber 2 is equivalent to a steam overshoot buffer of the inner pot 1. When a small amount of steam in the inner pot 1 is counteracted, excessive steam will enter the condensation chamber 2 through the steam outlet 12. The meaning of the steam outlet 12 being fluidly connected to the air inlet 21 is as follows: when the inner pot 1 and the condensation chamber 2 are set at a certain distance, additional pipes or pipelines (such as Figure 2 When the inner tank 1 and the condensing chamber 2 are arranged close to each other, the air inlet 21 can also be directly connected to the inner tank 1 (not shown in the figure). The meanings of other fluid connections in this application are similar to those here and will not be repeated.

[0026] The above-mentioned gas outlet 22 is provided with a pressure check valve 9 (the pressure check valve is a conventional structure) which can control the opening and closing of the gas outlet 22. In this way, after the steam in the inner pot 1 enters the condensing chamber 2, the pressure check valve 9 can only be opened to exhaust when the internal pressure in the condensing chamber 2 reaches the preset pressure value of the pressure check valve 9 (i.e., the pressure required for the pressure check valve 9 to open), thereby effectively avoiding excessive steam discharge and excessive heat loss. Of course, in order to ensure the sealing between the inner pot 1 and the door body in the electric steamer, the preset pressure value of the pressure check valve 9 is less than the sealing force of the electric steamer door body.

[0027] Furthermore, the above-mentioned condensation chamber 2 is arranged in the above-mentioned exhaust channel 40, so that heat can be transferred between the cold air in the exhaust channel 40 and the steam in the condensation chamber 2, thereby realizing steam condensation, continuously reducing the steam pressure in the condensation chamber 2, so that the pressure value in the condensation chamber 2 is continuously less than the preset pressure value of the pressure check valve 9, thereby further reducing the discharge of steam.

[0028] Furthermore, the condensation chamber 2 is arranged on the top surface of the air guide plate 41 (made of metal), and the air guide plate 41 is provided with an upwardly protruding groove, so that an upper exhaust cavity 411 is formed on the bottom surface of the condensation chamber 2. At the same time, the bottom plate 42 is recessed downward at the corresponding position of the condensation chamber 2 to form a lower exhaust cavity 421. The outlet pipe 221 and the pressure check valve 9 are both arranged in the lower exhaust cavity 421, and the upper exhaust cavity 411 is offset relative to the lower exhaust cavity 421. Through the above design, the air outlet of the fan 3 can be respectively retained in the upper exhaust cavity 411 and the lower exhaust cavity 421 and form a vortex, and the air in the upper exhaust cavity 411 and the lower exhaust cavity 421 can form an up-and-down convection, so that heat transfer with the steam in the condensation chamber 2 can be better performed, and the airflow in the outlet pipe 221 and the gas ejected from the pressure check valve 9 can be recooled, so as to further reduce the external discharge of steam.

[0029] In addition, in order to further reduce the discharge of steam, in the present invention, a guide plate 7 is provided between the pressure check valve 9 and the air inlet port 401, the outlet valve port of the pressure check valve 9 is opposite to the guide plate 7, and an air flow gap 8 is left between the guide plate 7 and the inner wall of the air guide cover 4. Since the guide plate 7 is arranged in the exhaust passage 40, on the one hand, the steam discharged from the pressure check valve 9 directly contacts the guide plate 7, and at the same time, the airflow in the exhaust passage 40 also directly contacts the guide plate 7, so that the steam discharged from the pressure check valve 9 is condensed once; on the other hand, when the airflow in the exhaust passage 40 blows through the guide plate 7, a certain negative pressure area will be formed on its back side (i.e., the side facing the pressure check valve 9), so that the steam discharged from the pressure check valve 9 can form a vortex with the cold air, so that the steam and air are fully mixed, and the steam is condensed twice, so as to further reduce the discharge of steam. Preferably, the guide plate 7 is an arc-shaped plate, the airflow gap 8 is formed between its upper end and the air guide plate 41 , the lower end is fixed to the bottom plate 42 , and the outlet valve port of the pressure check valve 9 is opposite to the inner concave surface of the guide plate 7 .

[0030] When the whole machine is working normally, the condensation chamber 2 and the inner tank 1 will form a relatively closed space. If the steam in the condensation chamber 2 continues to condense and the steam inlet 11 is not sufficiently supplied with steam, the above-mentioned relatively closed space may gradually form a negative pressure space, thereby causing the door of the electric steamer to be unable to open or other safety hazards. Therefore, in this embodiment, the inner tank 1 is provided with the above-mentioned air replenishment port 23, and the air replenishment port 23 is provided with an air replenishment check valve 6 that can control the opening and closing of the air replenishment port 23. In this way, when a negative pressure space is formed in the condensation chamber 2, the air replenishment check valve 6 opens, and the outside air is replenished into the condensation chamber 2, thereby avoiding the occurrence of the above-mentioned problems and ensuring the safe use of the electric steamer.

[0031] In addition, the above-mentioned drain port 24 is opened at the lower part of the condensation chamber 2, and the drain port 24 can be connected to the inner tank 1 or the steam generator through a drain pipe (not shown), so that the condensed water generated in the condensation chamber 2 can be discharged into the inner tank 1 or the steam generator to achieve steam recovery and reuse.

Claims

1. A steam exhaust structure, comprising an inner pot (1) having a steam inlet (11) and a steam outlet (12), characterized in that: It also comprises a condensation chamber (2) having an air inlet (21) and an air outlet (22), wherein the air inlet (21) is in fluid communication with the steam outlet (12), and the air outlet (22) is provided with a pressure check valve (9) capable of controlling the opening and closing of the air outlet (22); It also includes an exhaust passage (40), on which the condensation chamber (2) is arranged; The device further comprises a fan (3) and an air guide cover (4), wherein the air guide cover (4) comprises an air inlet port (401) and an air outlet port (402), the fan (3) is arranged at the air inlet port (401), and the air guide cover (4) comprises an air guide plate (41) and a bottom plate (42) which are buckled together, the air guide plate (41) and the bottom plate (42) enclosing the air exhaust channel (40), and the condensation chamber (2) is arranged on the top surface of the air guide plate (41); The air outlet (22) is provided with an air outlet pipe (221), the air outlet pipe (221) is opposite to the air inlet port (401), and the pressure one-way valve (9) is provided on the air outlet pipe opening of the air outlet pipe (221); A guide plate (7) is provided between the pressure check valve (9) and the air inlet port (401); an air outlet of the pressure check valve (9) is opposite to the guide plate (7), and an air flow gap (8) is left between the guide plate (7) and the inner wall of the air guide cover (4); The inner container (1) is provided with an air supply port (23), and the air supply port (23) is provided with an air supply check valve (6) capable of controlling the opening and closing of the air supply port (23).

2. The steam exhaust structure according to claim 1, characterized in that: The bottom plate (42) is recessed downward at a position corresponding to the condensation chamber (2) to form an exhaust lower concave chamber (421), and at least the exhaust pipe opening of the exhaust pipe (221) and the pressure one-way valve (9) are arranged in the exhaust lower concave chamber (421).

3. The steam exhaust structure according to claim 2, characterized in that: The air guide plate (41) is provided with an upwardly protruding groove, thereby forming an exhaust upper concave cavity (411) on the bottom surface of the condensation cavity (2).

4. The steam exhaust structure according to claim 3, characterized in that: The exhaust upper concave cavity (411) and the exhaust lower concave cavity (421) are offset and opposed to each other.

5. The steam exhaust structure according to claim 1, characterized in that: The guide plate (7) is an arc-shaped plate, the airflow gap (8) is formed between its upper end and the air guide plate (41), the lower end is fixed to the bottom plate (42), and the outlet valve port of the pressure check valve (9) is opposite to the inner concave surface of the guide plate (7).

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