Steam oven drainage structure

Abstract

The utility model discloses a steam oven drainage structure which comprises a cooking cavity, a first water tank, a second water tank, an evaporator, a drainage water pump, a first valve, a second valve, a third valve, a fourth valve, a main control module, a first drainage pipe, a second drainage pipe and a third water inlet pipe. The first water tank is detachably arranged on the peripheral side of the cooking cavity; the evaporator, the drainage water pump, the first valve, the second valve, the third valve and the fourth valve are electrically connected with the main control module. The water inlet end of the second water tank is communicated with the water purifier. According to the utility model, the water flow velocity in the second drain pipe is higher than that of the third drain pipe by reducing the waterway intersections and valve body accessories in the second drain pipe, and the water pressure of the third drain pipe is higher than that of the second drain pipe, thereby avoiding the problem that old water in the second drain pipe flows back to the evaporator.

Description

TECHNICAL FIELD

[0001] The utility model relates to domestic appliance technical field, specifically, especially, it relates to a steam oven drainage structure. BACKGROUND

[0002] The existing steam oven is generally provided with water tank, evaporator and cooking cavity and the like, the water tank is communicated with the evaporator, the evaporator is equipped with steam outlet, the water in the water tank enters the evaporator and heats to generate steam, the steam enters the cooking cavity in turn through the steam outlet and heats the food, when the steam oven stops working, the evaporator stops heating.

[0003] However, the existing steam oven needs to manually add water for water replenishment on the one hand, and for the user who expects high automation degree, frequent water replenishment brings bad experience to the user. On the other hand, when the evaporator stops working, the water in the evaporator remains in the evaporator, and after long-term non-use, the water remaining in the evaporator is easy to breed bacteria.

[0004] Therefore, in order to solve the problem that the existing steam oven can only manually replenish water through the water tank and the evaporator remains stale water, the present application provides a steam oven drainage structure to improve the shortcomings. SUMMARY

[0005] The utility model aims at solving above-mentioned technical problem and adopts the technical scheme as follows:

[0006] A steam oven drainage structure, comprising a cooking cavity, a first water tank, a second water tank, an evaporator, a drainage water pump, a first valve, a second valve, a third valve, a fourth valve, a first water inlet pipe, a second drainage pipe and a third drainage pipe, the first water tank is detachably arranged on the side of the cooking cavity;

[0007] The water inlet end of the second water tank is communicated with a water purifier, and the water inlet end of the second water tank is provided with the fourth valve;

[0008] One end of the second drainage pipe is communicated with the water outlet end of the first water tank, and the other end of the second drainage pipe is communicated with the drainage water pump, and the water outlet end of the first water tank is provided with the second valve;

[0009] The evaporator is provided with a first connector and a second connector;

[0010] One end of the first water inlet pipe is communicated with the water outlet end of the second water tank, and the other end of the first water inlet pipe is communicated with the first connector, and the water outlet end of the second water tank is provided with the first valve;

[0011] One end of the third drainage pipe is communicated with the second connector, and the other end of the third drainage pipe is communicated with the second drainage pipe at the first position, and one side of the second connector is provided with the third valve;

[0012] The bottom surface of the first water tank and the bottom surface of the second water tank are located at a plane higher than a plane where the first joint is located; the volume of the first water tank is greater than the volume of the second water tank; and the aperture of the second drain pipe is greater than the aperture of the third drain pipe.

[0013] Preferably, the first position is between the second valve and the drain water pump.

[0014] Preferably, the first drain pipe is further provided, one end of the first drain pipe is communicated with the first water inlet pipe at the second position, the other end of the first drain pipe is communicated with the third drain pipe at the third position; the second position is located between the first valve and the evaporator, the second position is located at the lowest position of the first water inlet pipe; and the third position is located between the third valve and the evaporator.

[0015] Preferably, the second water inlet pipe and the fifth valve are further provided, one end of the second water inlet pipe is communicated with the water outlet end of the first water tank, the other end of the second water inlet pipe is communicated with the first water inlet pipe at the fourth position; the fifth valve is arranged in the second water inlet pipe; the fourth position is located between the first valve and the second position; or, the fourth position and the second position are located at the same position.

[0016] Preferably, the second check valve is arranged in the first drain pipe.

[0017] Preferably, the third check valve is arranged at the water outlet end of the fifth valve.

[0018] Preferably, the first check valve is arranged at the water outlet end of the first valve and the water outlet end of the second valve.

[0019] Preferably, the evaporator further comprises a sealing cover, a steam exhaust port, a first partition plate, a second partition plate, a first gap and a second through hole; the sealing cover has a steam cavity; the first partition plate is arranged in the sealing cover in an inclined manner, the first gap is arranged between the upper end of the first partition plate and the top wall of the sealing cover; the top wall of the sealing cover extends downward to form the second partition plate, the second partition plate is located between the upper end of the first partition plate and the steam exhaust port, and the second through hole is arranged on the second partition plate; the steam exhaust port is arranged at a position close to the top wall of the sealing cover, and the steam exhaust port is communicated with the steam cavity through the second through hole and the first gap.

[0020] Preferably, the evaporator further comprises a drain transition area; the bottom surface of the sealing cover is sunken to form the drain transition area; and the second joint is arranged at one side of the drain transition area.

[0021] Preferably, the first joint is located at a position higher than the position where the second joint is located.

[0022] Compared with the background art, the present utility model has the following beneficial effects:

[0023] 1. The stale water in the first water tank flows to the drain water pump through the second drain pipe, and the valve body and the waterway intersection through which the stale water flows are relatively less, so that the water flow resistance suffered by the stale water flowing from the first water tank to the drain water pump is also relatively less, and then the flow speed of the water in the second drain pipe is higher than that of the third drain pipe, the water pressure of the third drain pipe is greater than that of the second drain pipe, and the reverse flow of the stale water in the second drain pipe back to the evaporator is avoided.

[0024] 2. By arranging the third drain pipe with bidirectional water conveying, the clean water in the first water tank can be conveyed to the evaporator through the third drain pipe, and the stale water in the evaporator is sequentially discharged to the outside through the second joint, the third drain pipe, the second drain pipe and the drain water pump, so that the structure of the drain pipeline is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of the drain structure of the steam oven of the utility model;

[0026] Figure 2 It is a structure schematic view of the upper pipeline structure of the utility model;

[0027] Figure 3 It is Figure 2 It is a side view of the first water tank, the second water tank and the evaporator

[0028] Figure 4

[0029] Figure 5 It is a waterway system schematic view of the embodiment one of the utility model;

[0030] Figure 6 It is a waterway system schematic view of the embodiment two of the utility model;

[0031] Figure 7 It is a waterway system schematic view of the embodiment three of the utility model;

[0032] Figure 8 It is a sectional view schematic view of the evaporator.

[0033] ​Indicated in the drawings: 11. cooking cavity, 12. first water tank, 13. second water tank, 131. water level gauge, 14. evaporator, 141. first joint, 142. second joint, 143. steam exhaust port, 144. steam guide pipe, 145. sealing cover, 146. first partition, 147. second partition, 148. drainage transition area, 1451. steam cavity, 1461. first gap, 1471. second through hole, 15. drainage water pump, 161. first check valve, 162. second check valve, 163. third check valve, 17. water purifier, 18. mounting plate, 21. first valve, 22. second valve, 23. third valve, 24. fourth valve, 25. fifth valve, 31. first drainage pipe, 32. first water inlet pipe, 33. second drainage pipe, 34. second water inlet pipe, 35. third drainage pipe, 41. first position, 42. second position, 43. third position, 44. fourth position. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below, and the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout.

[0035] In the present application, unless otherwise specified and limited, the terms such as "assembly", "connection", and "joint" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection; it can be direct connection, or connection through intermediate medium; it can be internal connection of two elements. The "water outlet end" and "water inlet end" should be understood as the position close to the corresponding end in the pipe. The direction indicated by the "arrow" in the drawings represents the direction of water flow in the pipe, or the part indicated by the "arrow" represents the specific area indicated by the "arrow". For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0036] The technical scheme of the present application and its beneficial effects will be clearer and more explicit through the further description of the specific embodiments of the present application in combination with the drawings of the specification. The description of the embodiments below by referring to the drawings is exemplary, and is intended to explain the present application, and cannot be understood as a limitation of the present application.

[0037] The preferred embodiments provided by the present application are as follows: Figures 1-8As shown, a steam oven drainage structure includes a cooking cavity 11, a first water tank 12, a second water tank 13, an evaporator 14, a drainage water pump 15, a first valve 21, a second valve 22, a third valve 23, a fourth valve 24, a first water inlet pipe 32, a second drainage pipe 33, and a third drainage pipe 35. The first water tank 12 is detachably arranged on the side of the cooking cavity 11, and a user can detach the first water tank 12 to add water. The first water tank 12 is provided with a quick sealing joint, which is in communication with the second drainage pipe 33. The water inlet end of the second water tank 13 is in communication with a water purifier 17, and the water inlet end of the second water tank 13 is provided with the fourth valve 24. The second water tank 13 is provided with a water level meter 131, and the main control module of the steam oven sends an opening and closing signal to the fourth valve 24 after receiving the water level information of the water level meter 131, so as to ensure that the second water tank 13 is in a water state.

[0038] One end of the second drainage pipe 33 is in communication with the water outlet end of the first water tank 12, and the other end of the second drainage pipe 33 is in communication with the drainage water pump 15. The water outlet end of the first water tank 12 is provided with the second valve 22. The water outlet end of the first water tank 12 can be understood as being in the second drainage pipe 33 and being close to the first water tank 12. The second valve 22 is arranged on the first water inlet pipe 32 and is close to the water outlet end of the first water tank 12. The second valve 22 controls whether the water of the first water tank 12 flows to the drainage water pump 15.

[0039] The evaporator 14 is provided with a first joint 141 and a second joint 142. One end of the first water inlet pipe 32 is in communication with the water outlet end of the second water tank 13, and the other end of the first water inlet pipe 32 is in communication with the first joint 141. The water outlet end of the second water tank 13 is provided with the first valve 21. The first valve 21 is arranged on the first water inlet pipe 32 and is close to the water outlet end of the second water tank 13. The first valve 21 controls whether the water of the second water tank 13 flows to the evaporator 14.

[0040] One end of the third drainage pipe 35 is in communication with the second joint 142, and the other end of the third drainage pipe 35 is in communication with the second drainage pipe 33 at a first position 41. One side of the second joint 142 is provided with the third valve 23. The third valve 23 is arranged on the third drainage pipe 35 and is close to the second joint 142. The third valve 23 controls whether the water of the evaporator 14 flows to the first position 41 of the third drainage pipe 35.

[0041] The bottom surface of the first water tank 12 and the bottom surface of the second water tank 13 are both higher than the plane where the first joint 141 is located, so that the water in the first water tank 12 and the second water tank 13 can flow to the evaporator 14, and at the same time, it is ensured that the old water in the evaporator 14 cannot flow back to the first water tank 12 or the second water tank 13. The volume of the first water tank 12 is greater than that of the second water tank 13, and the aperture of the second drainage pipe 33 is greater than that of the third drainage pipe 35, so that the flow rate of the second drainage pipe 33 is higher than that of the third drainage pipe 35.

[0042] In this way, when the stale water in the first water tank 12 flows to the drainage water pump 15 from the second drainage pipe 33, the valve body and the waterway intersection through which the stale water flows are relatively less, and the water flow resistance received by the stale water is also relatively less. Therefore, the water flow rate in the second drainage pipe 33 is higher than that in the third drainage pipe 35, and the water pressure in the third drainage pipe 35 is greater than that in the second drainage pipe 33, thereby avoiding the reverse flow of the stale water in the second drainage pipe 33 back to the evaporator 14.

[0043] In this embodiment, when the second valve 22 and the third valve 23 are opened, the first valve 21 and the drainage water pump 15 are closed, and the water in the first water tank 12 is sequentially conveyed to the evaporator 14 through the second drainage pipe 33, the first position 41 and the third drainage pipe 35. When the first valve 21 is opened, the second valve 22, the third valve 23 and the drainage water pump 15 are closed, and the water in the second water tank 13 is conveyed to the evaporator 14 after passing through the first water inlet pipe 32.

[0044] After cooking, the first valve 21 and the second valve 22 are closed, the third valve 23 and the drainage water pump 15 are opened, and the drainage water pump 15 forms a negative pressure area in the second drainage pipe 33 and the third drainage pipe 35, thereby forcing the stale water in the evaporator 14 to be sucked out by the drainage water pump 15 and discharged to the outside, realizing the drainage of the stale water in the evaporator 14. Alternatively, when the user only uses the first water tank 12 during cooking, after cooking, the second valve 22 and the drainage water pump 15 are opened, the first valve 21 and the third valve 23 are closed, and the drainage water pump 15 forms a negative pressure area in the second drainage pipe 33, so that the stale water in the first water tank 12 is sucked out by the drainage water pump 15 and discharged to the outside. Alternatively, the first valve 21, the third valve 23 and the drainage water pump 15 are opened, and the second valve 22 is closed. The stale water in the second water tank 13 first flows into the evaporator 14, and the drainage water pump 15 forms a negative pressure area in the second drainage pipe 33 and the third drainage pipe 35, thereby forcing the stale water in the evaporator 14 to be sucked out by the drainage water pump 15 and discharged to the outside, realizing the drainage of the stale water in the second water tank 13 and the evaporator 14.

[0045] In this embodiment, the first position 41 is located between the second valve 22 and the drainage water pump 15. The height difference between the first water tank 12 and the evaporator 14 enables the clean water to flow into the evaporator 14, and the stale water in the evaporator 14 is extracted by the drainage water pump 15. At the same time, the drainage of the evaporator 14 and the drainage of the first water tank 12 both flow through the second drainage pipe 33, thereby simplifying the waterway structure of the drainage and avoiding the complicated assembly steps caused by the complex waterway structure.

[0046] The water outlet end of the first valve 21 and the water outlet end of the second valve 22 are both provided with a first check valve 161. The first check valve 161 enables the water flow direction of the first water inlet pipe 32 to always be away from the second water tank 13, and the water flow direction of the second drainage pipe 33 to always be away from the first water tank 12.

[0047] In this embodiment, the evaporator 14 includes a sealing cover 145, a steam exhaust port 143, a first partition 146, a second partition 147, a first gap 1461, and a second through hole 1471. The sealing cover 145 contains a steam cavity 1451. The first partition 146 is obliquely disposed within the sealing cover 145. A first gap 1461 is provided between the upper end of the first partition 146 and the top wall of the sealing cover 145. The top wall of the sealing cover 145 extends downward to form the second partition 147, which is located between the upper end of the first partition 146 and the steam exhaust port 143. The second through hole 1471 is disposed on the second partition 147. The steam exhaust port 143 is located near the top wall of the sealing cover 145 and communicates with the steam cavity 1451 through the second through hole 1471 and the first gap 1461. When the drain pump 15 draws out the stagnant water in the sealing cover 145, the air in the cooking chamber 11 can enter the sealing cover 145 through the steam guide pipe 144, thereby balancing the air pressure in the sealing cover 145 and making it easier for the drain pump 15 to draw out water.

[0048] In this embodiment, the evaporator 14 further includes a drainage transition zone 148, which is formed by the bottom surface of the sealing cover 145 sinking to create a stepped transition zone. The second connector 142 is disposed on one side of the drainage transition zone 148. The drainage transition zone 148 has a trough-shaped structure. During the process of draining stagnant water from the evaporator 14, the stagnant water in the sealing cover 145 will flow to the drainage transition zone 148 under the action of gravity. Specifically, the drainage transition zone 148 is located at the lowest position of the bottom surface of the sealing cover 145, so that the stagnant water in the sealing cover 145 can be completely drained.

[0049] In this embodiment, the first connector 141 is positioned higher than the second connector 142 to prevent water in the evaporator 14 from flowing back from the first connector 141 to the first water inlet pipe 32. Regardless of whether water enters the evaporator 14 from the first connector 141 or the second connector 142, the height difference between the first connector 141 and the second connector 142 ensures that the water always flows towards the second connector 142 and is discharged from the second connector 142 to the third drain pipe 35.

[0050] Example 2:

[0051] like Figures 1-3 As shown, based on Embodiment 1, a first drain pipe 31 is provided. One end of the first drain pipe 31 is connected to the first inlet pipe 32 at the second position 42, and the other end of the first drain pipe 31 is connected to the third drain pipe 35 at the third position 43.

[0052] The second position 42 is located between the first valve 21 and the evaporator 14, and is located lower than the outlet of the second water tank 13 and the first joint 141, i.e. the second position 42 is located at the lowest position of the first water inlet pipe 32, while the bottom of the second water tank 13 is higher than the first joint 141, so that when the stale water in the second water tank 13 is drained, the stale water can flow to the second position 42 under the action of gravity and then enter the first water outlet pipe 31, and the stale water in the second water tank 13 will not flow into the evaporator 14 through the first water inlet pipe 32. The third position 43 is located between the third valve 23 and the evaporator 14, and the third valve 23 controls the drainage of the second water tank 13 and the evaporator 14.

[0053] As shown in Figure 4 The bottom of the first water tank 12 and the second water tank 13 has a protruding structure on the supporting bracket or mounting plate 18, so as to raise the height of the first water tank 12 and the second water tank 13, so that the bottom of the first water tank 12 and the second water tank 13 is higher than the first joint 142, and the first water tank 12 and the second water tank 13 can flow into the evaporator 14 under the action of gravity. The distance D1 from the first water tank 12 to the mounting plate 18, the distance D2 from the second water tank 13 to the mounting plate 18, and the distance D3 from the first joint 142 to the mounting plate 18, D1>D3 and D2>D3.

[0054] When the evaporator 14 is drained, the first valve 21 and the second valve 22 are closed, the third valve 23 and the drainage water pump 15 are opened, and the drainage water pump 15 forms a negative pressure area in the second water outlet pipe 33 and the third water outlet pipe 35, so that the stale water in the evaporator 14 is sucked out by the drainage water pump 15 and discharged to the outside. When the first water tank 12 is used alone and needs to be drained, the second valve 22 and the drainage water pump 15 are opened, the first valve 21 and the third valve 23 are closed, and the drainage water pump 15 forms a negative pressure area in the second water outlet pipe 33, so that the stale water in the first water tank 12 is sucked out by the drainage water pump 15 and discharged to the outside. When the second water tank 13 is used for water supply, the first valve 21, the third valve 23 and the drainage water pump 15 are opened, and the second valve 22 is closed. The stale water in the second water tank 13 flows into the first water inlet pipe 32 and then flows into the first water outlet pipe 31 at the second position 42, then flows into the third water outlet pipe 35 at the third position 43, and then flows into the second water outlet pipe 33 at the first position 41. The drainage water pump 15 forms a negative pressure area in the second water outlet pipe 33, so that the stale water in the pipeline in communication (including the first water inlet pipe 32, the first water outlet pipe 31, the third water outlet pipe 35 and the second water outlet pipe 33) is sucked out by the drainage water pump 15 and discharged to the outside.

[0055] In the embodiment, the second check valve 162 is arranged in the first drain pipe 31 to avoid the problem of water reverse flow in the first drain pipe 31, and to avoid the stale water discharged from the evaporator 14 from flowing back into the first drain pipe 31, and to avoid the clean water from flowing back into the first drain pipe 31 from the third drain pipe 35 when the first water tank 12 supplies water to the evaporator 14.

[0056] Embodiment three:

[0057] As shown in the figure, the embodiment is based on the embodiment two, and the second water inlet pipe 34 and the fifth valve 25 are additionally arranged, one end of the second water inlet pipe 34 is communicated with the water outlet end of the first water tank 12, the other end of the second water inlet pipe 34 is communicated with the first water inlet pipe 32 at the fourth position 44, and the fifth valve 25 is arranged on the second water inlet pipe 34; by arranging the independent second water inlet pipe 34, the water supply path and the drain path of the first water tank 12 to the evaporator 14 are separated, and each valve body can be configured as a one-way valve, and the third drain pipe 35 also becomes a one-way water flow pipe. Figure 3 The fourth position 44 is located between the first valve 21 and the second position 42, and the first water tank 12 introduces the clean water into the first water inlet pipe 32 at the fourth position 44, and the purpose of arranging the fourth position 44 before the second position 42 is to facilitate the installation of the pipe line, and to reduce the abnormal problems such as the increase of water flow resistance, the increase of water pressure, water leakage, no water, and the like caused by the stagger phenomenon between the pipe lines.

[0058] In the optional embodiment, the fourth position 44 and the second position 42 are at the same position, and the water flow direction at the position has four directions, and the four-way pipe can be formed at the position by a four-way joint or a pipe integrated forming process.

[0059] When the first water tank 12 is filled with water, the fifth valve 25 is opened, the first valve 21, the second valve 22, the third valve 23 and the drain water pump 15 are closed, and the clean water in the first water tank 12 sequentially passes through the second water inlet pipe 34, the fourth position 44 and the first water inlet pipe 32 under the action of gravity and reaches the evaporator 14. When the second water tank 13 is filled with water, the first valve 21 is opened, the second valve 22, the third valve 23, the fifth valve 25 and the drain water pump 15 are closed, and the clean water in the second water tank 13 passes through the first water inlet pipe 32 under the action of gravity and reaches the evaporator 14.

[0060]

[0061] ​When the evaporator 14 is drained, the first valve 21, the fifth valve 25 and the second valve 22 are closed, the third valve 23 and the drain water pump 15 are opened, the drain water pump 15 forms a negative pressure area in the second drain water pipe 33 and the third drain water pipe 35, so that the stale water in the evaporator 14 is sucked out by the drain water pump 15 and discharged to the outside. When the first water tank 12 is drained, the second valve 22 and the drain water pump 15 are opened, the first valve 21, the fifth valve 25 and the third valve 23 are closed, the drain water pump 15 forms a negative pressure area in the second drain water pipe 33, so that the stale water in the first water tank 12 is sucked out by the drain water pump 15 and discharged to the outside. When the second water tank 13 is drained, the first valve 21, the third valve 23 and the drain water pump 15 are opened, the second valve 22 and the fifth valve 25 are closed, the stale water of the second water tank 13 flows into the first drain water pipe 31 through the first water inlet pipe 32 and the second position 42, then flows into the third drain water pipe 35 through the third position 43, and then flows into the second drain water pipe 33 through the first position 41, the drain water pump 15 forms a negative pressure area in the second drain water pipe 33, so that the stale water in the pipeline in communication (including the first water inlet pipe 32, the first drain water pipe 31, the third drain water pipe 35 and the second drain water pipe 33) is sucked out by the drain water pump 15 and discharged to the outside.

[0062] In the embodiment, the water outlet end of the fifth valve 25 is provided with the third check valve 163; the third check valve 163 avoids the problem of leakage or even backflow of water in the second water inlet pipe 34 due to the water pressure difference between the two ends of the fifth valve 25, and the water in the first water tank 12 can only flow from the water outlet end of the fifth valve 25 to the fourth position 44 after entering the fifth valve 25 through the second water inlet pipe 34.

[0063] In the description of the specification, the description of the terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model, and the illustrative description of the above terms in the specification does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] Through the above description of the structure and principle, those skilled in the art should understand that the utility model is not limited to the above specific embodiments, and improvements and replacements of the technology known in the art based on the utility model fall within the protection scope of the utility model, which should be limited by the claims.

Claims

1. A steam oven drain structure, characterized by, The cooking cavity, the first water tank, the second water tank, the evaporator, the drainage water pump, the first valve, the second valve, the third valve, the fourth valve, the first water inlet pipe, the second drainage pipe, the third drainage pipe; the first water tank is detachably arranged on the side of the cooking cavity; The water inlet end of the second water tank is communicated with the water purifier, and the water inlet end of the second water tank is provided with the fourth valve; One end of the second drainage pipe is communicated with the water outlet end of the first water tank, and the other end of the second drainage pipe is communicated with the drainage water pump, and the water outlet end of the first water tank is provided with the second valve; The evaporator is provided with a first joint and a second joint; one end of the first water inlet pipe is communicated with the water outlet end of the second water tank, and the other end of the first water inlet pipe is communicated with the first joint; the water outlet end of the second water tank is provided with the first valve; One end of the third drainage pipe is communicated with the second joint, and the other end of the third drainage pipe is communicated with the second drainage pipe at the first position; one side of the second joint is provided with the third valve; The bottom surface of the first water tank and the bottom surface of the second water tank are located on a plane higher than the plane where the first joint is located; the volume of the first water tank is greater than the volume of the second water tank; the aperture of the second drainage pipe is greater than the aperture of the third drainage pipe.

2. The steam oven drain structure according to claim 1, wherein: The first position is between the second valve and the drainage water pump.

3. The drainage structure of the steam oven according to claim 2, characterized in that: Further comprising: a first drainage pipe, one end of the first drainage pipe is communicated with the first water inlet pipe at a second position, and the other end of the first drainage pipe is communicated with a third drainage pipe at a third position; The second position is between the first valve and the evaporator, and the third position is between the third valve and the evaporator; the second position is located at the lowest position of the first water inlet pipe.

4. The steam oven drain structure according to claim 3, characterized in that: Further comprising: A second water inlet pipe and a fifth valve, one end of the second water inlet pipe is communicated with the water outlet end of the first water tank, and the other end of the second water inlet pipe is communicated with the first water inlet pipe at a fourth position; The fifth valve is arranged in the second water inlet pipe; The fourth position is between the first valve and the second position; Or, the fourth position and the second position are at the same position.

5. The steam oven drain structure according to claim 3, wherein: A second check valve is arranged in the first drainage pipe.

6. The draining structure of a steam oven according to claim 4, wherein: The water outlet end of the fifth valve is provided with a third check valve.

7. The draining structure of a steam oven according to claim 1, wherein: The water outlet end of the first valve and the water outlet end of the second valve are each provided with a first check valve.

8. The draining structure of a steam oven according to claim 1, wherein: The evaporator further comprises: a sealing cover, a steam exhaust port, a first partition, a second partition, a first gap and a second through hole; The sealing cover has a steam cavity inside; The first partition is arranged obliquely in the sealing cover, and the first gap is arranged between the upper end of the first partition and the top wall of the sealing cover; The top wall of the sealing cover extends downward to form the second partition, and the second partition is located between the upper end of the first partition and the steam exhaust port, and the second through hole is arranged on the second partition; The steam exhaust port is arranged close to the top wall of the sealing cover, and the steam exhaust port is communicated with the steam cavity through the second through hole and the first gap.

9. The steam oven drain structure according to claim 8, wherein: The evaporator further comprises a drainage transition area; a bottom surface of the sealing cover is sunken to form the drainage transition area; and the second joint is arranged at one side of the drainage transition area.

10. The draining structure of a steam oven according to any one of claims 1-9, characterized in that: The first joint is arranged at a position higher than that of the second joint.

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