Sealing device and hydrogen storage device

Abstract

The invention discloses a sealing device and relates to the technical field of hydrogen energy utilization, the sealing device comprises a sealing ring, a pressing ring and a driving device, the sealing ring is used for being sleeved with a first groove in the circumferential direction of a cover body, the pressing ring is used for being arranged below the cover body, and an output piece of the driving device penetrates through the cover body to be connected with the pressing ring; the pressing ring can be driven to move in the axial direction of the cover body to extrude the sealing ring, so that the sealing ring deforms to seal a gap between the tank body and the cover body; the invention further discloses a hydrogen storage device which comprises a tank body, a cover body and a sealing device, and the cover body can be fixedly connected to an opening of the tank body, so that the sealing device and the hydrogen storage device can enable the sealing ring to be fully deformed and unfolded under the conditions that the pressure in the hydrogen storage device is insufficient and the temperature is low; the sealing performance of the joint position of the tank body and the cover body is effectively guaranteed, and hydrogen leakage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy utilization, and in particular to a sealing device and a hydrogen storage device. Background Art

[0002] Hydrogen energy has the advantages of high calorific value, environmental friendliness, and recyclability. As an ideal energy source, hydrogen energy has a very broad development prospect. In the development and use of hydrogen energy, the storage link of hydrogen energy is its core part. Various countries have done a lot of exploration on the development of hydrogen storage technology, hoping to find and develop safe, cheap and effective hydrogen storage methods.

[0003] New energy vehicles often use hydrogen as one of their power sources, and hydrogen storage devices are often placed in new energy vehicles to provide hydrogen. At present, the end of the hydrogen storage device is usually provided with an interface, and an end cap is provided at the interface. On the one hand, the end cap can be connected to the hydrogen storage device to seal its tank body, and on the other hand, a hydrogen delivery pipeline can be connected to the end cap for discharging or inputting hydrogen.

[0004] In the prior art, a sealing ring is provided between the end cover and the tank body, and the gas pressure of hydrogen is used to squeeze the sealing ring, so that the sealing ring is deformed and fits tightly between the end cover and the tank body, thereby achieving the effect of preventing leakage of the high-pressure hydrogen storage tank. However, the above method has poor deformability of the sealing ring at low temperatures and is prone to insufficient deformation. Moreover, with the use of the hydrogen storage device, the internal pressure of the hydrogen storage device is insufficient, which is also prone to insufficient deformation and expansion of the sealing ring, thereby deteriorating the sealing performance of the connection between the tank body and the cover body of the hydrogen storage device, resulting in hydrogen leakage. Summary of the invention

[0005] The purpose of the present invention is to provide a sealing device and a hydrogen storage device to solve the problems existing in the above-mentioned prior art, so that the sealing ring can still fully deform and expand under the condition of insufficient pressure and low temperature in the hydrogen storage device, effectively ensuring the sealing performance of the connection position between the tank body and the cover body, and avoiding hydrogen leakage.

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

[0007] The present invention provides a sealing device, comprising a sealing ring, a pressure ring and a driving device, wherein the sealing ring is used to be sleeved in a first groove in the circumference of a cover body, the pressure ring is used to be placed under the cover body, and the output member of the driving device passes through the cover body and is connected to the pressure ring, and can drive the pressure ring to move along the axial direction of the cover body to squeeze the sealing ring, so that the sealing ring is deformed to close the gap between the tank body and the cover body.

[0008] In some embodiments, the driving device includes a rod body, which is used to pass through the cover body and be axially fixed to the cover body. One end of the rod body extending into the tank body can be threadedly connected to the pressure ring. The pressure ring is used to be slidably connected to the tank body along a direction parallel to the axial direction of the cover body. Rotating the rod body can drive the pressure ring to approach and squeeze the sealing ring.

[0009] In some embodiments, a clutch device is further included, wherein the clutch device has a first state and a second state. The clutch device in the first state can connect the rod body and the cover body so that rotation of the rod body can drive rotation of the cover body. The clutch device in the second state can disconnect the rod body from the cover body. Rotating the rod body can change the clutch device from the first state to the second state and cause the rod body to be threadedly connected to the pressure ring.

[0010] In some embodiments, the clutch device includes a first fixed block, a second fixed block, an insertion rod and a push-out piece, the first fixed block is used to be fixedly connected to the outer wall of the rod body, the first fixed block is provided with a first slot, the second fixed block is used to be fixed on the cover body, the second fixed block is provided with a second slot, the push-out piece is used to be fixed on the inner wall of the tank body and can pass through the pressure ring and extend into the second slot, the insertion rod can be movably arranged in the first slot, an elastic element is provided in the first slot, the two ends of the elastic element are respectively abutted against the inner wall of the first slot and the insertion rod, the insertion rod can be inserted into the second slot under the elastic force of the elastic element to put the clutch device in the first state, and the rotation of the cover body can drive the second fixed block to approach the push-out piece in the axial direction of the cover body and push the insertion rod out of the second slot to put the clutch device in the second state.

[0011] In some embodiments, the lower surface of the insertion rod is an inclined surface, and the distance from the inclined surface to the upper end surface of the cover body gradually decreases in a direction away from the rod body.

[0012] In some embodiments, at least one guide plate is fixedly provided on the side wall of the second fixed block, the guide plate having a guide slope, and the end surface of the second slot is provided with a limit piece, the limit piece is used to limit the insertion rod from completely disengaging from the second slot, when the insertion rod abuts against the abutting piece, the length of the insertion rod extending out of the limit piece is a first length, when the rod body drives the insertion rod to rotate until it circumferentially disengages from the second fixed block and the guide plate, the length of the insertion rod extending out of the limit piece is a second length, and when the end of the insertion rod away from the first fixed block is squeezed by the guide slope, the insertion rod can change from the second length to the first length.

[0013] The present invention further provides a hydrogen storage device, comprising a tank body, a cover body and any one of the sealing devices described above, wherein the cover body can be fixedly connected to the opening of the tank body.

[0014] In some embodiments, the first groove has an inclined surface, and the distance from the inclined surface to the inner wall of the tank body gradually increases in a direction away from the upper end surface of the cover body.

[0015] In some embodiments, the cover body is further provided with a first through groove which is arc-shaped and connects the space inside the tank body with the first groove. The pressure ring can extend from the space inside the tank body through the first through groove into the first groove to squeeze the sealing ring.

[0016] In some embodiments, the cover body has a first accommodating cavity, which is communicated with the outside world. A ratchet and a plurality of pawls are disposed in the first accommodating cavity, and the pawl can be inserted into the ratchet. The ratchet is coaxially disposed and fixedly connected to the rod body, and the pawl is rotatably connected to the cover body. When the rod body rotates along a first direction, the ratchet disengages from the engagement with the pawl. When the rod body rotates along a second direction, the ratchet maintains engagement with each of the pawls, so that the rod body drives the cover body to rotate synchronously and the cover body can be screwed out of the tank body. The first direction is opposite to the second direction.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention provides a sealing device and a hydrogen storage device. A sealing ring, a pressure ring and a driving device are arranged in the hydrogen storage device. The sealing ring is sleeved in a first groove in the circumferential direction of a cover body, the pressure ring is arranged below the cover body, the driving device passes through the cover body and is connected with the pressure ring, and can drive the pressure ring to move along the axial direction of the cover body to squeeze the sealing ring, so that the sealing ring is deformed to close the gap between the tank body and the cover body. Therefore, the sealing device and the hydrogen storage device can make the sealing ring still be fully deformed and expanded under the condition of insufficient pressure and low temperature in the hydrogen storage device, so as to effectively ensure the sealing performance of the connection position between the tank body and the cover body and avoid hydrogen leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a cross-sectional view of a hydrogen storage device in one embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of a hydrogen storage device in one embodiment of the present invention;

[0022] Figure 3 for Figure 1 A partial enlarged schematic diagram of the hydrogen storage device A;

[0023] Figure 4 A schematic diagram of the cover structure of a hydrogen storage device in one embodiment of the present invention;

[0024] Figure 5 for Figure 1 A partial enlarged schematic diagram of the hydrogen storage device B in FIG.

[0025] Figure 6 This is a schematic structural diagram of a pressure ring of a hydrogen storage device in one embodiment of the present invention;

[0026] Figure 7 This is a schematic structural diagram of a guide plate of a hydrogen storage device in one embodiment of the present invention.

[0027] Figure 8 A cross-sectional view of a ratchet of a hydrogen storage device in one embodiment of the present invention.

[0028] Among them: 1-tank body; 14-ejection member; 2-cover body; 22-first groove; 223-inclined surface; 24-first through groove; 27-driving device; 271-rod body; 272-first fixed block; 273-first slot; 2732-insertion rod; 2733-elastic element; 2734-inclined surface; 28-first accommodating chamber; 281-ratchet; 282-pawl; 29-second fixed block; 291-second slot; 292-guide plate; 293-guide inclined surface; 3-sealing ring; 4-pressing ring; 432-thread; 433-square groove. DETAILED DESCRIPTION

[0029] 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. 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 creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] This embodiment provides a sealing device, such as Figure 1-3As shown, it includes a sealing ring 3, a pressure ring 4 and a driving device 27. The sealing ring 3 is used to be sleeved in the first circumferential groove 22 of the cover body 2, and the pressure ring 4 is used to be placed under the cover body 2. The output member of the driving device 27 passes through the cover body 2 and is connected to the pressure ring 4, and can drive the pressure ring 4 to move along the axial direction of the cover body 2 to squeeze the sealing ring 3, so that the sealing ring 3 is deformed to close the gap between the tank body 1 and the cover body 2. The present application provides a sealing ring 3, a pressure ring 4 and a driving device 27 in a hydrogen storage device, wherein the sealing ring 3 is sleeved in a first circumferential groove 22 of the cover body 2, and the pressure ring 4 is arranged below the cover body 2. The driving device 27 passes through the cover body 2 and is connected to the pressure ring 4, and can drive the pressure ring 4 to move axially along the cover body 2 to squeeze the sealing ring 3, so that the sealing ring 3 is deformed to close the gap between the tank body 1 and the cover body 2. Therefore, the sealing device and the hydrogen storage device can enable the sealing ring 3 to be fully deformed and expanded under the condition of insufficient pressure and low temperature in the hydrogen storage device, thereby effectively ensuring the sealing performance of the connection position between the tank body 1 and the cover body 2 and avoiding hydrogen leakage.

[0032] In some implementations of this embodiment, Figure 6 As shown, the driving device 27 includes a rod 271, the rod 271 is used to pass through the cover 2 and is axially fixed to the cover 2, and one end of the rod 271 extending into the tank body 1 can be threadedly connected to the pressing ring 4, and the pressing ring 4 is used to slide and connect in the tank body 1 along a direction parallel to the axial direction of the cover 2, and rotating the rod 271 can drive the pressing ring 4 to approach and squeeze the sealing ring 3. Through the threaded connection between the rod 271 and the pressing ring 4 and the sliding connection between the pressing ring 4 and the tank body 1, the squeezing of the sealing ring 3 by the pressing ring 4 is a controllable and stable process. This structure can accurately adjust the pressure of the pressing ring 4 on the sealing ring 3. During the operation of the device, when it is affected by external factors such as vibration and temperature changes, this clamping structure can ensure that the sealing ring 3 always maintains a good sealing state and will not lose the sealing effect due to slight displacement or deformation, thereby improving the reliability of the seal.

[0033] In some implementations of this embodiment, Figure 5As shown, the sealing device also includes a clutch device, which has a first state and a second state. The clutch device in the first state can connect the rod body 271 and the cover body 2 so that the rotation of the rod body 271 can drive the cover body 2 to rotate. The clutch device in the second state can disconnect the rod body 271 from the cover body 2. Rotating the rod body 271 can change the clutch device from the first state to the second state and make the rod body 271 threadedly connected to the pressing ring 4. The clutch device has two states to realize the multifunctionality of the sealing device. On the one hand, the clutch device is used as a rotating component as an integral part for the rotation operation of the cover body 2. On the other hand, during the operation of the device, if hydrogen leakage is found, the clutch device is switched to the second state by rotating the rod body 271, so that the pressing ring 4 squeezes the sealing ring 3 to close the leakage point without the need for complex disassembly or adjustment of the entire device, which greatly improves the practicality and adaptability of the sealing device.

[0034] In some embodiments of the present embodiment, the clutch device includes a first fixed block 272, a second fixed block 29, an insertion rod 2732 and a push-out member 14, the first fixed block 272 is used to be fixedly connected to the outer wall of the rod body 271, a first slot 273 is provided in the first fixed block 272, the second fixed block 29 is used to be fixed on the cover body 2, a second slot 291 is provided in the second fixed block 29, the push-out member 14 is used to be fixed on the inner wall of the tank body 1 and can pass through the pressure ring 4 and extend into the second slot 291, and the insertion rod 2732 can move The cover 2 is movably arranged in the first slot 273, and an elastic element 2733 is arranged in the first slot 273. The two ends of the elastic element 2733 are respectively in contact with the inner wall of the first slot 273 and the plug 2732. The plug 2732 can be inserted into the second slot 291 under the elastic force of the elastic element 2733 to put the clutch device in the first state. The rotation of the cover 2 can drive the second fixed block 29 to approach the push-out member 14 in the axial direction of the cover 2 and push the plug 2732 out of the second slot 291 to put the clutch device in the second state. When the cover 2 rotates, the push-out member 14 approaches the second fixed block 29 in the axial direction, and the plug 2732 is pushed out of the second slot 291 by this relative movement, so as to realize the switching from the first state to the second state. The whole process is based on the interaction between mechanical parts, and does not require complex electronic control or additional power source, which reduces the risk of clutch device failure due to electronic component failure or power supply problem, and improves the reliability of state switching.

[0035] In some implementations of this embodiment, the lower surface of the plug rod 2732 is an inclined surface 2734, and the distance from the inclined surface 2734 to the upper end surface of the cover body 2 gradually decreases in the direction away from the rod body 271. The lower surface of the plug rod 2732 is an inclined surface 2734, so that the plug rod 2732 can gradually and smoothly disengage from the second slot 291 during the process of being pushed out. This gradual disengagement can reduce the impact force and friction between the components, thereby reducing the possibility of damage between the plug rod 2732 and the slot due to sudden strong friction or collision, and improving the smoothness and reliability of the state switching of the clutch device.

[0036] In some implementations of this embodiment, Figure 7 As shown, at least one guide plate 292 is fixedly arranged on the side wall of the second fixed block 29, and the guide plate 292 has a guiding inclined surface 293. The end surface of the second slot 291 is provided with a limit piece, and the limit piece is used to limit the insertion rod 2732 from completely disengaging from the second slot 291. When the insertion rod 2732 abuts against the abutting piece 14, the length of the insertion rod 2732 extending out of the limit piece is a first length. When the rod body 271 drives the insertion rod 2732 to rotate until it circumferentially disengages from the second fixed block 29 and the guide plate 292, the length of the insertion rod 2732 extending out of the limit piece is a second length. When the end of the insertion rod 2732 away from the first fixed block 272 is squeezed by the guiding inclined surface 293, the insertion rod 2732 can change from the second length to the first length. When the rod body 271 moves downward and rotates along the axis of the cover body 2, the insertion rod 2732 is squeezed by the guiding slope 293 and retracts. This mechanical squeezing method can ensure that the insertion rod 2732 is stably disengaged from the second slot 291, so that the clutch device enters the second state. This squeezing method through the guiding slope 293 is more reliable and can effectively avoid the insertion rod 2732 from getting stuck or incompletely disengaging during the disengagement process, thereby realizing accurate switching of the clutch device state.

[0037] Embodiment 2

[0038] The present embodiment also provides a hydrogen storage device, comprising a tank body 1, a cover body 2 and the sealing device of the first embodiment, wherein the cover body 2 can be fixedly connected to the opening of the tank body 1. By arranging a sealing ring 3, a pressing ring 4 and a driving device 27 in the hydrogen storage device, the sealing ring 3 is sleeved in the first circumferential groove 22 of the cover body 2, the pressing ring 4 is arranged below the cover body 2, the driving device 27 passes through the cover body 2 and is connected to the pressing ring 4, and can drive the pressing ring 4 to move along the axial direction of the cover body 2 to squeeze the sealing ring 3, so that the sealing ring 3 is deformed to close the gap between the tank body 1 and the cover body 2. Therefore, the sealing device and the hydrogen storage device can make the sealing ring 3 fully deform and expand under the condition of insufficient pressure and low temperature in the hydrogen storage device, effectively ensuring the sealing performance of the connection position between the tank body 1 and the cover body 2, and avoiding hydrogen leakage; specifically The tank body 1 is vertically arranged, and an opening is arranged at the upper end of the tank body 1, and a connecting pipe is fixed at the opening. The cover body 2 is cylindrical, and the cover body 2 can be inserted into the connecting pipe along the axial direction of the connecting pipe and fixed to the connecting pipe. A connecting sleeve is fixed to the outer periphery of the cover body 2, and an installation groove is arranged at the upper end of the connecting pipe. The connecting sleeve is threadedly connected to the installation groove, so that the cover body 2 can be connected to the tank body 1. The cover body 2 and the tank body 1 are connected by threads. This connection method facilitates the installation and disassembly between the cover body 2 and the tank body 1. During the tightening process, the mutual engagement between the threads can make the cover body 2 and the tank body 1 fit tightly, which can effectively prevent hydrogen leakage.

[0039] In some implementations of this embodiment, the first groove 22 has an inclined surface 223, and the distance from the inclined surface 223 to the inner wall of the tank body 1 gradually increases in the direction away from the upper end surface of the cover body 2. The first groove 22 with gradually decreasing radial dimensions can make the sealing ring 3 seal the gap between the cover body 2 and the tank body 1 due to a small deformation amount during the upward movement due to extrusion. In the case of insufficient pressure and low temperature in the hydrogen storage device, the sealing ring 3 can still be fully deformed and expanded, effectively ensuring the sealing performance of the connection position between the tank body 1 and the cover body 2 to prevent hydrogen leakage.

[0040] In some implementations of this embodiment, Figure 4 As shown, the cover body 2 is further provided with a first through groove 24, which is arc-shaped and connects the space in the tank body 1 with the first groove 22, and the pressing ring 4 can extend from the space in the tank body 1 through the first through groove 24 into the first groove 22 to squeeze the sealing ring 3. The first through groove 24 enables the pressing ring 4 to reach the first groove 22 from the inside of the tank body 1, thereby applying pressure to the sealing ring 3, ensuring that the pressing ring 4 can accurately apply pressure to the sealing ring 3 through the first through groove 24, effectively increasing the compression degree of the sealing ring 3, and thus improving the sealing effect.

[0041] In some implementations of this embodiment, Figure 8As shown, the cover body 2 has a first accommodating cavity 28, which is communicated with the outside. A ratchet 281 and a pawl 282 are arranged in the first accommodating cavity 28, and the pawl 282 can be inserted into the ratchet 281. The ratchet 281 is coaxially arranged and fixedly connected with the rod body 271. The pawl 282 is rotatably connected to the cover body 2. When the rod body 271 rotates along a first direction, the ratchet 281 disengages from the engagement with the pawl 282. When the rod body 271 rotates along a second direction, the ratchet 281 maintains the engagement with each pawl 282, so that the rod body 271 drives the cover body 2 to rotate synchronously, and the cover body 2 can be screwed out of the tank body 1. The first direction is opposite to the second direction. When maintenance is required inside the sealing device, such as replacing the sealing ring 3 or checking other components, the cover body 2 can be easily unscrewed by controlling the clutch of the ratchet 281 and the pawl 282, so that maintenance personnel can easily open the sealing device and perform necessary repairs and maintenance work, which facilitates the disassembly and maintenance operations of the hydrogen storage device.

[0042] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A sealing device, comprising a sealing ring, characterized in that: It also includes a pressure ring and a driving device, the sealing ring is used to be sleeved in a first groove in the circumference of the cover body, the pressure ring is used to be placed under the cover body, the output member of the driving device passes through the cover body and is connected to the pressure ring, and can drive the pressure ring to move along the axial direction of the cover body to squeeze the sealing ring, so that the sealing ring is deformed to close the gap between the tank body and the cover body.

2. The sealing device according to claim 1, characterized in that: The driving device includes a rod body, which is used to pass through the cover body and be axially fixed to the cover body. One end of the rod body extending into the tank body can be threadedly connected to the pressure ring. The pressure ring is used to be slidably connected to the tank body along a direction parallel to the axial direction of the cover body. Rotating the rod body can drive the pressure ring to approach and squeeze the sealing ring.

3. The sealing device according to claim 2, characterized in that: It also includes a clutch device, which has a first state and a second state. The clutch device in the first state can connect the rod body and the cover body so that the rotation of the rod body can drive the cover body to rotate. The clutch device in the second state can disconnect the rod body from the cover body. Rotating the rod body can change the clutch device from the first state to the second state and cause the rod body to be threadedly connected to the pressure ring.

4. The sealing device according to claim 3, characterized in that: The clutch device includes a first fixed block, a second fixed block, an insertion rod and a push-out piece, the first fixed block is used to be fixedly connected to the outer wall of the rod body, the first fixed block is provided with a first slot, the second fixed block is used to be fixed on the cover body, the second fixed block is provided with a second slot, the push-out piece is used to be fixed on the inner wall of the tank body and can pass through the pressure ring and extend into the second slot, the insertion rod can be movably arranged in the first slot, an elastic element is provided in the first slot, the two ends of the elastic element respectively abut against the inner wall of the first slot and the insertion rod, the insertion rod can be inserted into the second slot under the elastic force of the elastic element to put the clutch device in the first state, and the rotation of the cover body can drive the second fixed block to approach the push-out piece in the axial direction of the cover body and push the insertion rod out of the second slot to put the clutch device in the second state.

5. The sealing device according to claim 4, characterized in that: The lower surface of the insertion rod is in the form of an inclined surface, and in the direction away from the rod body, the distance from the inclined surface to the upper end surface of the cover body gradually decreases.

6. The sealing device according to claim 4, characterized in that: At least one guide plate is fixedly arranged on the side wall of the second fixed block, and the guide plate has a guiding inclined surface. The end surface of the second slot is provided with a limiting piece, and the limiting piece is used to limit the insertion rod from completely disengaging from the second slot. When the insertion rod abuts against the abutting piece, the length of the insertion rod extending out of the limiting piece is a first length. When the rod body drives the insertion rod to rotate until it circumferentially disengages from the second fixed block and the guide plate, the length of the insertion rod extending out of the limiting piece is a second length. When the end of the insertion rod away from the first fixed block is squeezed by the guiding inclined surface, the insertion rod can change from the second length to the first length.

7. A hydrogen storage device, characterized in that: It comprises a tank body, a cover body and the sealing device according to any one of claims 1 to 6, wherein the cover body can be fixedly connected to the opening of the tank body.

8. The hydrogen storage device according to claim 7, characterized in that: The first groove has an inclined surface, and the distance from the inclined surface to the inner wall of the tank body gradually increases in a direction away from the upper end surface of the cover body.

9. The hydrogen storage device according to claim 7, characterized in that: The cover body is also provided with a first through groove which is arc-shaped and connects the space in the tank body with the first groove. The pressure ring can extend from the space in the tank body through the first through groove into the first groove to squeeze the sealing ring.

10. The hydrogen storage device according to claim 7, characterized in that: The cover body is provided with a first accommodating cavity, which is communicated with the outside. A ratchet and a pawl are arranged in the first accommodating cavity, and the pawl can be inserted into the ratchet. The ratchet is coaxially arranged and fixedly connected with the rod body, and the pawl is rotatably connected with the cover body. When the rod body rotates along a first direction, the ratchet disengages from the engagement with the pawl. When the rod body rotates along a second direction, the ratchet maintains the engagement with each of the pawls, so that the rod body drives the cover body to rotate synchronously and the cover body can be screwed out of the tank body. The first direction is opposite to the second direction.

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