TWI868639B - Steam trapping device - Google Patents

Abstract

A drainage device comprises: a base, comprising: an inlet portion, provided with an inlet channel for inputting discharged steam or condensed water; an outlet portion, provided with an outlet channel for outputting condensed water; a first fluid chamber, respectively connected with the inlet portion and the outlet portion; a valve, arranged inside the first fluid chamber, the valve having a valve inlet and a valve outlet, the valve inlet being connected with the inlet portion, and the valve outlet being connected with the outlet portion; and a cover, arranged above the base, having a second fluid chamber, the second fluid chamber being respectively connected with the inlet portion and the outlet portion; wherein a nozzle is arranged at the connection between the outlet portion and the second fluid chamber. In another embodiment, the cover has a check structure, including a flow path space and a plurality of fluid control elements, the fluid control elements are arranged in the flow path space, and the flow path space is connected to the inlet and the outlet respectively.

Description

Drainage device

This disclosure relates to a drainage device, and more particularly to a drainage device that reduces steam leakage and can handle variable discharge volumes.

Existing dehumidifier technologies are generally divided into intermittent dehumidifiers and continuous dehumidifiers. In terms of the operating principle, intermittent dehumidifiers are commonly float dehumidifiers and thermal dehumidifiers; when the water in the dehumidifier accumulates to a certain level, or drops to a certain temperature, the float (float type) or temperature difference (thermal type) drives the valve to open to discharge condensed water. However, intermittent dehumidifiers often have condensed water and steam at the inlet at the same time. When the valve is opened, not only condensed water will be discharged, but steam will also be discharged at the same time, resulting in energy waste.

The continuous dehumidifier has a nozzle in the internal cavity of the dehumidifier, and the nozzle diameter is selected according to the designed drainage volume of the dehumidifier. When steam and condensed water enter the cavity at the inlet of the dehumidifier at the same time, because the cavity is a fixed space, as the steam continues to enter the cavity, the condensed water will be discharged from the nozzle without exhausting the steam. Although the continuous dehumidifier can avoid the leakage of steam, the nozzle diameter of the continuous dehumidifier is fixed, and the nozzle of the appropriate diameter must be selected in advance according to the designed drainage volume of the dehumidifier. Therefore, when the drainage volume at the process equipment end is in a variable state, the nozzle of the dehumidifier is difficult to cope with, and water blockage is easy to occur.

On the other hand, in terms of the design of the pipeline system, back pressure may be generated at the rear end of the water trap. Therefore, in order to avoid the condensate backflow and the inability to drain smoothly or the need to increase the drainage volume, it is necessary to install an additional check valve in the pipeline system in addition to the existing water trap device. This method requires more installation space and maintenance costs in the pipeline system, and also increases the risk of steam leakage.

In view of the above, the present disclosure provides a drainage device that can improve the problem of steam leakage in the known device and can handle various steam drainage locations that are widely used, and has great application flexibility.

According to one concept of the present disclosure, the drainage device provided includes a base, a cover, a valve and a nozzle. The base includes an inlet, an outlet and a first fluid chamber formed in the base, wherein the inlet is provided with an inlet channel for inputting steam or condensed water to be discharged, and the outlet is provided with an outlet channel for outputting condensed water for discharge, and the first fluid chamber is in fluid communication with the inlet and the outlet in the base. The cover is connected to a side of the base corresponding to the first fluid chamber, and a second fluid chamber is formed inside the cover, which is in fluid communication with the inlet and the outlet, respectively. The valve is arranged in the first fluid chamber, and the valve has a valve inlet and a valve outlet, wherein the valve inlet is in fluid communication with the inlet, and the valve outlet is in fluid communication with the outlet. The nozzle is arranged at the place where the inlet of the base is connected to the fluid of the second fluid chamber, or at the place where the outlet of the base is connected to the fluid of the second fluid chamber.

According to another concept of the present disclosure, the provided drainage device includes a base, a cover and a valve. The base includes an inlet, an outlet and a first fluid chamber formed in the base, wherein the inlet is provided with an inlet channel for inputting steam or condensed water to be discharged, and the outlet is provided with an outlet channel for outputting condensed water for discharge, and the first fluid chamber is in fluid communication with the inlet and the outlet in the base. The cover is connected to a side of the base corresponding to the first fluid chamber, and a check structure is formed inside the cover, and the check structure includes a flow path space and a plurality of fluid control elements, and the fluid control elements are arranged in the flow path space, and the flow path space is in fluid communication with the inlet and the outlet, respectively. The valve is disposed in the first fluid chamber, and has a valve inlet and a valve outlet. The valve inlet is in fluid communication with the inlet of the base, and the valve outlet is in fluid communication with the outlet of the base.

Based on the above concept, the fluid control elements in the check structure are arranged in each flow path space so that the flow path space forms a plurality of arc-shaped flow paths.

Based on the above concept, the drainage device further includes a nozzle, which is arranged at the fluid connection between the inlet and the second fluid chamber, or at the fluid connection between the outlet and the second fluid chamber.

Based on the above concept, the cover has a through opening, and the position of the through opening corresponds to the position of the nozzle.

The rest of the aforementioned concept, wherein when the inlet portion is at a saturated steam temperature, the valve is in a closed state.

Based on the above concept, the inlet is provided with a cleaning opening, which is connected to a pressure relief valve.

Based on the above concept, the base and the cover are integrally formed.

Based on the above concept, the valve has a temperature sensing element, which is driven by temperature changes to open and close the valve accordingly.

Based on the above concept, the drainage device further includes a sealing structure disposed between the valve and the first fluid chamber.

Based on the above concept, the drainage device further includes a connection structure, wherein the connection structure includes a connection groove provided on the base and a connection protrusion provided on the cover, and the connection protrusion corresponds to the connection groove.

1: Base

11: Import Department

111: Inlet channel

112: Inlet connection part

113: Clean opening

12: First fluid chamber

121: Enter the wandering channel

122: Exit the wandering channel

123: Sealed structure

13: Export Department

131: Outflow channel

132: Outflow connection part

1321: Nozzle

14: Connecting groove

141: Sealing element

15:Through hole

16: Cover plate

2, 2’: Cover

21: Second fluid chamber

22: Check structure

221: Flow path space

222: Fluid control element

23:Through the opening

24: Connecting convex part

25:Through hole

3: Valve

31: Valve import

32: Temperature sensing element

33: Valve outlet

To further understand the features and technical contents of the present disclosure, please refer to the following detailed description and attached drawings of the embodiments of the present disclosure. However, the detailed description and attached drawings are only provided for reference and explanation, and are not used to limit the present disclosure; wherein: Figure 1 is a three-dimensional schematic diagram of a drainage device according to an embodiment of the present disclosure.

Figure 2 is a schematic diagram of an exploded view of a drainage device according to an embodiment of the present disclosure.

Figure 3 is a three-dimensional schematic diagram of the base of a drainage device according to an embodiment of the present disclosure.

Figure 4 is a three-dimensional schematic diagram of the cover of the drainage device according to an embodiment of the present disclosure.

Figures 5A and 5B are schematic cross-sectional views of a drainage device according to an embodiment of the present disclosure, used to illustrate the flow state of the fluid inside the drainage device.

Figure 6 is a three-dimensional schematic diagram of the cover of the drainage device according to another embodiment of the present disclosure.

FIG. 7A and FIG. 7B are schematic cross-sectional views of a drainage device according to an embodiment of the present disclosure, used to illustrate the flow state of the fluid inside the drainage device.

Please refer to Figures 1 to 4, which illustrate a drainage device 100 according to an embodiment of the present disclosure, wherein Figures 1 and 2 are respectively a three-dimensional schematic diagram and an exploded schematic diagram of the drainage device 100, Figure 3 is a three-dimensional schematic diagram of the base 1 of the drainage device of the present disclosure embodiment, and Figure 4 is a three-dimensional schematic diagram of the cover 2 of the drainage device of the present disclosure embodiment.

As shown in FIG. 1 and FIG. 2 , the drainage device 100 of this embodiment includes a base 1, a cover 2, and a valve 3, wherein the base 1 and the cover 2 are connected to form a closed structure. A first fluid chamber 12 is formed in the base 1 to accommodate the valve 3; the cover 2 is coupled to one side of the base 1, such as the upper side of the base 1, and closes the first fluid chamber 12 and the internal components of the drainage device 100.

In detail, as shown in Fig. 2 and Fig. 3, in this embodiment, the base 1 includes an inlet 11, a first fluid chamber 12, and an outlet 13, and the first fluid chamber 12 is in fluid communication with the inlet 11 and the outlet 13. For example, the first fluid chamber 12 is in fluid communication with an inlet flow channel 121 and an outlet flow channel 122 in the base 1, that is, the inlet 11 of the base 1 is in fluid communication with the first fluid chamber 12 through the inlet flow channel 121, and the outlet 13 is in fluid communication with the first fluid chamber 12 through the outlet flow channel 122. In this embodiment, the inlet portion 11 of the base 1, the inlet flow channel 121, the first fluid chamber 12 (and the valve 3 disposed in the first fluid chamber 12), the outlet flow channel 122, and the outlet portion 13 form the first fluid passage of the drainage device 100 disclosed herein.

In this embodiment, the base 1 further includes an inlet connection portion 112 and an outlet connection portion 132, which are fluidly connected to the inlet portion 11 and the outlet portion 13, respectively. In this embodiment, one of the inlet connection portion 112 and the outlet connection portion 132 is provided with a nozzle (not shown in the figure) to drain water and prevent steam from passing through, which will be further explained below.

As shown in FIG. 2 and FIG. 4 , according to the present embodiment, a second fluid chamber 21 is formed inside the cover 2. When the cover 2 is combined with the base 1, the second fluid chamber 21 is in fluid communication with the inlet connection portion 112 and the outlet connection portion 132 of the base 1, respectively, and is thus in fluid communication with the inlet portion 11 and the outlet portion 13, respectively. In other words, in the present embodiment, when the cover 2 is combined with the base 1, the inlet portion 11 of the base 1, the inlet connection portion 112 of the base 1, the second fluid chamber 21 of the cover 2, the outlet connection portion 132 of the base 1, and the outlet portion 13 of the base 1 form the second fluid passage of the drainage device 100 disclosed herein. In this embodiment, the base 1 further includes a cover plate 16, which is disposed between the first fluid chamber 12 and the second fluid chamber 21 to prevent the first fluid passage and the second fluid passage from influencing each other during the drainage process, resulting in poor drainage effect or steam leakage. Furthermore, the cover plate 16 is fixed to the first fluid chamber 12, which can increase the stability of the valve 3 in the first fluid chamber 12.

As shown in FIG. 3 and FIG. 4 , the cover 2 has a through opening 23, the position of which corresponds to the nozzle (not shown in the figure, and will be further described below), so as to facilitate the replacement and maintenance of the nozzle according to actual needs. In this embodiment, the base 1 is provided with a connecting groove 14, and the cover 2 is provided with a connecting protrusion 24. The connecting groove 14 and the connecting protrusion 24 correspond to each other to form a connecting structure of the drainage device 100; the connecting structure facilitates the assembly and combination between the cover 2 and the base 1, and can further enhance the sealing between the base 1 and the cover 2, and prevent steam from leaking from the connection between the base 1 and the cover 2. In this embodiment, a connecting groove 14 is formed in the base 1, and a connecting protrusion 24 is formed in the cover 2, but the present disclosure is not limited thereto; in other embodiments, a connecting groove may be formed in the cover 2, and a connecting protrusion may be provided in the base 1. According to the present disclosure, a sealing element 141 may be further provided in the connecting groove 14, which helps to increase the sealing between the base 1 and the cover 2 to prevent steam leakage.

In the present embodiment, the base 1 and the cover 2 are respectively provided with a plurality of through holes 15, 25 (e.g., screw holes), and the through holes 15, 25 are respectively provided at the periphery of the base 1 and the cover 2 and correspond to each other. In the present embodiment, the base 1 and the cover 2 are respectively connected and fixed by a plurality of fasteners (e.g., bolts) screwed with the through holes 15, 25. In the present embodiment, the base 1 and the cover 2 are respectively provided with six through holes 15, 25 symmetrically, so as to evenly disperse the internal steam pressure during operation, and avoid the cover 2 and the base 1 from being separated due to excessive or uneven internal steam pressure. In the present embodiment, the number of through holes is six, but the present disclosure is not limited thereto. In other embodiments, the number of through holes can be appropriately changed according to actual design requirements and the size of the drainage device.

As described above, the base 1 and the cover 2 of the drainage device 100 disclosed in the present disclosure can be formed as independent components, and further combined and fixed by matching fasteners with through holes. Alternatively, in other embodiments, the cover 2 and the base 1 can be integrally formed. According to the present disclosure, the base and the cover of the drainage device are made of high-strength materials, such as stainless steel or a suitable alloy.

Please refer to FIG. 5A and FIG. 5B, which are cross-sectional schematic diagrams of a drainage device according to an embodiment of the present disclosure, used to illustrate the flow state of the fluid inside the drainage device; FIG. 5A and FIG. 5B respectively show the flow state of the fluid inside the drainage device when the valve 3 is in a closed state and when the valve 3 is in an open state.

As described above, the drain device 100 of the present embodiment mainly comprises a base 1, a cover 2 and a valve 3 disposed inside the drain device 100. When the base 1 and the cover 2 are combined with each other, the inlet 11 of the base 1, the inlet flow channel 121, the first fluid chamber 12, the outlet flow channel 122, and the outlet 13 form a first fluid passage of the drain device 100. The first fluid passage passes through the valve 3, and the valve 3 controls the inflow and discharge of condensed water. In addition, the inlet 11 of the base 1, the inlet connection portion 112 of the base 1, the second fluid chamber 21 of the cover 2, the outlet connection portion 132 of the base 1, and the outlet 13 of the base 1 form a second fluid passage of the drain device 100. As shown in FIG. 5A and FIG. 5B , a nozzle 1321 is provided in the second fluid passage of the drainage device 100 , for example, in the outflow channel 131 , so that the second fluid passage of the drainage device 100 disclosed in the present disclosure can be drained by the action of the nozzle 1321 while preventing steam from passing through.

As shown in the figure, the base 1 includes an inlet portion 11, a first fluid chamber 12, and an outlet portion 13. The first fluid chamber 12 has an inlet flow connection channel 121 and an outlet flow connection channel 122. The inlet portion 11 is connected to the first fluid chamber 12 through the inlet flow connection channel 121, and the outlet portion 13 is connected to the first fluid chamber 12 through the outlet flow connection channel 122. The inlet portion 11 includes an inlet flow channel 111, which is connected to an inlet pipe of an external process equipment (not shown in the figure) to receive steam from the process equipment and condensed water to be discharged; the inlet flow connection portion 112 is connected to the second fluid chamber 21 when the cover 2 is combined with the base 1. The outlet portion 13 includes an outlet flow channel 131 to output condensed water. The outlet portion 13 includes an outlet flow connection portion 132, which is connected to the second fluid chamber 21 when the cover 2 is connected to the base 1. In this embodiment, a nozzle 1321 is provided in the outlet connection portion 132. The valve 3 includes a valve inlet 31, a temperature sensing element 32, and a valve outlet 33. The temperature sensing element 32 is, for example, a bimetallic temperature sensing element or a liquid capsule device with a volatile liquid inside, which can drive the valve 3 to open or close through temperature changes, but the present disclosure is not limited to this. In an alternative embodiment, the valve 3 can be an electronic valve, which can control the opening and closing of the pipeline by energizing or de-energizing the electromagnetic coil.

In detail, after the steam and condensed water of the process equipment enter the drainage device 100 of the present disclosure from the inlet channel 111, they further enter the second fluid chamber 21 along the inlet connection portion 112, and through the action of the nozzle 1321, the condensed water can be continuously discharged from the outlet channel 131 while preventing the steam from passing through. When the steam and condensed water flow through the nozzle 1321, the flow rate and pressure will change, allowing the condensed water to be discharged first. In other words, under normal operating conditions, steam and condensed water pass through the second fluid passage of the drainage device 100 disclosed in the present invention, and under the action of the nozzle 1321, only water is discharged without exhausting steam; because the steam can always be substantially retained in the drainage device 100, the temperature in the drainage device 100 will not drop excessively, so that the temperature in the drainage device 100 (especially at the inlet 11) can be maintained at a temperature close to that of saturated steam. At this time, the valve 3 is in a closed state, that is, the first fluid passage remains closed.

When the amount of water entering the inlet channel 111 changes (for example, the amount of water suddenly increases), the nozzle 1321 has a fixed diameter and a fixed flow rate, and the condensed water cannot be discharged continuously and effectively, which will cause the condensed water to begin to gather at the inlet portion 11 of the drainage device 100 (i.e., "water blocking"), and the temperature of the inlet portion 11 begins to drop due to water blocking. When the condensed water enters the valve inlet 31 from the inlet channel 111 through the inlet flow connection channel 121, since the temperature is lower than the steam temperature, the drive valve 3 is actuated to open, so that the condensed water can pass through the valve 3 from the inlet channel 111 and the outlet channel 131; that is, at this time, the first fluid passage becomes a passage for fluid to pass due to the opening of the valve 3. When the amount of water in the inlet 11 is discharged to a certain extent through the first fluid channel and the temperature around the inlet 11 rises to a temperature close to the saturated steam temperature, the valve 3 is driven to close, and the drainage device 100 returns to the state of drainage through the second fluid channel.

In this embodiment, a sealing structure 123 is further provided between the first fluid chamber 12 and the valve 3, so that when the valve 3 is installed inside the first fluid chamber 12, the valve inlet 31 can be aligned with the inlet flow channel 121, and the valve outlet 33 can be aligned with the outlet flow channel 122 through the sealing structure 123, and the gap between the first fluid chamber 12 and the valve 3 can be effectively sealed.

In this embodiment, the inlet 11 also includes a cleaning opening 113 connected to an external pressure relief valve (not shown). The cleaning opening 113 is closed under normal operation of the drainage device 100; when the flow channel is to be cleaned, the pressure relief valve can be opened to discharge the steam inside the inlet 11 to clean the pipeline.

Please refer to Figure 6, which is a three-dimensional schematic diagram of the cover 2' of the drainage device according to another embodiment of the present disclosure. The drainage device of this embodiment is similar to the aforementioned embodiment, but the difference is that in this embodiment, a check structure 22 with a check effect is further formed in the second fluid chamber 21 of the cover 2'.

As shown in the figure, a check structure 22 is formed on the inner side of the cover 2' (the side opposite to the base and connected), and the check structure 22 includes a flow path space 221 and a plurality of fluid control elements 222, each of which is disposed in the flow path space 221. The check structure 22 can change the pressure and speed of the fluid in the flow path space, so that the fluid is easy to flow in a single direction, achieving the effect of flow check.

In addition, the fluid control element 222 is disposed in the flow path space 221, so that part of the straight fluid path in the flow path space 221 is changed into a circular path, thereby increasing the path length of the fluid, increasing the difficulty of the fluid flowing in the circular path of the check structure 22, and forcing the fluid to flow in a path that is easy to flow, thereby achieving the effect of flow check.

Please refer to FIG. 7A and FIG. 7B, which are cross-sectional schematic diagrams of the drainage device 200 according to the embodiment of the present disclosure, for illustrating the flow state of the fluid inside the drainage device; FIG. 7A and FIG. 7B respectively show the flow state of the fluid inside the drainage device when the valve 3 is in a closed state and when the valve 3 is in an open state.

Similarly, when the cover 2' is connected to the base 1, the inlet connection part 112 is connected to the flow path space 221 of the cover 2', and the outlet connection part 132 is connected to the flow path space 221 of the cover 2, forming a second fluid path of the drainage device 200. A nozzle 1321 is provided in the second fluid path, for example, in the outlet connection part 132 of the base 1.

When steam or condensed water from the process equipment enters from the inlet channel 111, the condensed water and steam will enter the flow path space 221 of the cover body 2 along the inlet connection portion 112, and will be continuously discharged from the outlet channel 131 through the nozzle 1321. At this time, the inlet portion 11 can always maintain a temperature close to that of saturated steam, so that the valve 3 is in a closed state.

When the amount of water entering the inlet channel 111 changes, the nozzle 1321 has a fixed diameter and a fixed flow rate, and the condensed water cannot be discharged continuously and effectively, which will cause the inlet 11 of the drainage device 200 to start blocking water. At this time, the temperature of the inlet 11 begins to drop, and the condensed water enters the valve inlet 31 from the inlet channel 111 through the inlet flow channel 121. The valve 3 is driven to open due to the temperature change, so that the condensed water can be discharged from the inlet channel 111 through the valve 3 and discharged from the outlet channel 131 until the amount of water in the inlet 11 is discharged to a certain extent. After the temperature of the inlet 11 rises to the saturated steam temperature, the drive valve 3 is closed because the temperature returns to the steam temperature.

In this embodiment, the check structure 22 formed on the inner side of the cover 2' helps the condensed water to move from the inlet 11 to the outlet 13 in an easy flow path, and can prevent the condensed water from moving from the outlet 13 to the inlet 11, thereby making the drainage function of the drainage device 200 smoother.

The drainage device disclosed in the present invention is designed with a first fluid passage and a second fluid passage in parallel. Under normal operating conditions, the nozzle and/or the check structure in the second fluid passage can effectively prevent drainage backflow and steam leakage, thereby improving the energy efficiency of existing drainage devices. It can also adapt to the operating conditions of changing water volume. When the amount of water to be discharged increases, the first fluid passage is automatically opened through the valve, so that the drainage can be discharged through the first fluid passage, thereby improving the application flexibility of the drainage device.

In addition, through the design of the check structure, the drainage device disclosed in the present invention can be operated without the need for an external check valve. In addition to saving pipeline space and costs, it is easier to adapt to various process operation fields and has great application potential.

11: Import Department

111: Inlet channel

112: Inlet connection part

113: Clean opening

12: First fluid chamber

121: Enter the wandering channel

122: Exit the wandering channel

13: Export Department

131: Outflow channel

132: Outflow connection part

1321: Nozzle

21: Second fluid chamber

23:Through the opening

24: Connecting convex part

25:Through hole

3: Valve

31: Valve import

32: Temperature sensing element

33: Valve outlet

Claims (12)

A drainage device comprises: a base, comprising: an inlet portion, provided with an inlet channel for inputting steam or condensed water to be discharged; an outlet portion, provided with an outlet channel for outputting condensed water for discharge; and a first fluid chamber formed inside the base and connected to the inlet and the outlet respectively; a valve, arranged in the first fluid chamber, the valve having a valve inlet and a valve outlet, the valve inlet being connected to the inlet fluid, the valve outlet being connected to the inlet fluid The first fluid chamber is connected to the outlet; a cover body is connected to the side of the base corresponding to the first fluid chamber, a second fluid chamber is formed inside the cover body, and the second fluid chamber is connected to the inlet and the outlet respectively; and a nozzle is replaceably arranged at the inlet and the second fluid chamber, or the outlet and the second fluid chamber; wherein the cover body has a through opening, and the position of the through opening corresponds to the position of the nozzle. A drainage device comprises: a base, comprising: an inlet portion, provided with an inlet channel for inputting steam or condensed water to be discharged; an outlet portion, provided with an outlet channel for outputting condensed water for discharge; and a first fluid chamber formed in the base and connected to the inlet and the outlet respectively; a valve, arranged in the first fluid chamber, the valve having a valve inlet and a valve outlet, the valve inlet being connected to the inlet fluid, the valve outlet being connected to the inlet fluid The inlet is connected to the fluid of the outlet; A cover body is connected to the side of the base corresponding to the first fluid chamber, and a check structure is formed inside the cover body. The check structure includes a flow path space and a plurality of fluid control elements. The fluid control elements are arranged in the flow path space. The flow path space is connected to the inlet and the outlet fluid respectively; and a nozzle is arranged at the place where the inlet is connected to the flow path space, or the place where the outlet is connected to the flow path space. A drainage device as described in claim 2, wherein the fluid control elements are disposed in each flow path space so that the flow path space forms a plurality of arc-shaped flow paths. A drainage device as described in claim 2, wherein the cover has a through opening, and the position of the through opening corresponds to the position of the nozzle. The drainage device as described in claim 1 further comprises an inlet connection portion connecting the inlet portion and the second fluid chamber, and an outlet connection portion connecting the outlet portion and the second fluid chamber, wherein the nozzle is disposed at the inlet connection portion or the outlet connection portion. The drainage device as described in claim 2 further comprises an inlet connection portion connecting the inlet portion and the flow path space, and an outlet connection portion connecting the outlet portion and the flow path space, wherein the nozzle is disposed at the inlet connection portion or the outlet connection portion. A drainage device as described in claim 1 or 2, wherein when the inlet portion is at a saturated steam temperature, the valve is in a closed state. A drainage device as described in claim 1 or 2, wherein the inlet portion is provided with a cleaning opening which is externally connected to a pressure relief valve. A drainage device as described in claim 1 or 2, wherein the base and the cover are integrally formed. A drainage device as described in claim 1 or 2, wherein the valve has a temperature sensing element which is driven by temperature changes to open and close the valve accordingly. The drainage device as described in claim 1 or 2 further includes a sealing structure disposed between the valve and the first fluid chamber. The drainage device as described in claim 1 or 2 further comprises a connection structure, wherein the connection structure comprises a connection groove provided on the base and a connection protrusion provided on the cover, and the connection protrusion corresponds to the connection groove.

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