Monitoring system of lithium battery energy storage battery box and protection device thereof

Abstract

The invention relates to the technical field of lithium battery safety protection, in particular to a monitoring system of a lithium battery energy storage battery box and a protection device thereof, the protection device comprises a battery box shell, a long integrator arranged in the battery box shell, and a row of lithium batteries arranged on each of the two sides of the long integrator, a plurality of monitoring components are installed near each lithium battery and used for monitoring the overheating or combustion condition of the lithium battery, once the lithium battery goes wrong, the monitoring components can send out signals in time, automatic treatment is conducted in the battery box, and the lithium battery is prevented from being damaged. When the lithium battery is overheated or burnt, the coolant fluid can be quickly positioned and conveyed into the jet flow frame, the jet flow frame outside the overheated or burnt lithium battery can move, the coolant fluid is timely dissipated, the lithium battery is wrapped, the lithium battery is cooled, meanwhile, heat is prevented from being diffused, and the surrounding lithium battery is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery safety protection, and in particular to a monitoring system and a protection device for a lithium battery energy storage battery box. Background Art

[0002] Electric vehicles have outstanding advantages in environmental protection and energy conservation. For low-carbon and environmentally friendly electric vehicles, a safe battery system is indispensable, which can ensure the safety of electric vehicles. Electric vehicle lithium batteries have the risk of overheating or combustion during use. At present, there are three main reasons for battery box problems: micro-short circuits inside the battery box cause local temperature increases. When the local temperature reaches a certain value, the electrolyte of the battery decomposes to produce gas. Due to the increase of gas inside the closed battery, the internal pressure of the battery increases. In severe cases, the gas inside the battery will be discharged from the inside of the battery, which is manifested as battery smoking; short circuits in the power nut collection line of the battery will cause the battery to self-ignite, loose connection cables of the battery or poor contact of the connector will increase the contact resistance, and when a large current passes through, heat will be generated, causing the battery to self-ignite; when an electric vehicle encounters a traffic accident, the battery will be hit, squeezed or short-circuited externally, which will cause the battery to self-ignite. Based on the purpose of lithium battery safety protection, the present invention provides a monitoring system and a protection device for a lithium battery energy storage battery box. Summary of the invention

[0003] The purpose of the present invention is to provide a monitoring system for a lithium battery energy storage battery box and a protection device thereof to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a monitoring system for a lithium battery energy storage battery box, comprising a monitoring instrument integrated module for monitoring overheating or burning of batteries inside the battery box, a combined switch module for operating a motor and delivering a coolant, and a control module connected to the combined switch module, wherein the control module is also connected to the monitoring instrument integrated module, and when the monitoring instrument integrated module finds that the battery is overheating or burning, it sends a working signal to the combined switch module through the control module.

[0005] A protective device for a lithium battery energy storage battery box, comprising a battery box shell, a long integrator and a row of lithium batteries arranged on both sides of the long integrator are arranged in the battery box shell, and a jet rack for discharging coolant is sleeved on the outside of each lithium battery, the long integrator comprises a long main pipe for conveying coolant, a row of transfer assemblies fixed on the long main pipe, two symmetrically distributed semi-control assemblies for each transfer assembly transmission, and a long shaft for transmitting a row of transfer assemblies, one end of the long main pipe extends to the outside of the battery box shell, and the semi-control assemblies are connected between the long main pipe and the jet rack.

[0006] The transfer assembly includes a transfer plate frame, a transfer shaft and a transfer wheel. One end of the transfer plate frame is fixed on the long main pipe, and the transfer plate frame supports the transfer shaft. The long shaft is connected to the cylindrical gear fixed on the transfer shaft through a meshing transmission through spiral teeth, and the long shaft is movably sleeved in a circular hole opened on the transfer plate frame. Two transfer wheels are fixed on the transfer shaft.

[0007] The transfer wheel comprises a disc body and a convex plate fixed at one side edge of the disc body, and the split shaft passes through the middle of the disc body of the transfer wheel.

[0008] The semi-controlled integration includes a flat pipe fixedly connected to the long main pipe, an inclined pipe connected between the flat pipe and the jet frame, a gripper for driving the flat pipe, a supporting group transmission-connected between the inclined pipe and the transfer wheel, and a support frame for supporting the supporting group, wherein the support frame is fixed on the long main pipe.

[0009] The supporting group includes a flat column that is in contact with the transfer wheel for transmission, a return spring piece that pushes the flat column, a central control shaft that is transmission-connected to the flat column, and a double plate fixedly sleeved on the central control shaft. The flat column slides through the inner hole of the square cylinder fixed on the support frame, and one end of the return spring piece is fixed on the square cylinder. One end of the central control shaft is connected by a fixed cylinder gear and a row of teeth meshing and transmission arranged on the flat column, and the other end of the central control shaft is movably sleeved in a through hole opened on the support frame.

[0010] The supporting group also includes a side shaft and a worm gear. A row of teeth are distributed in an arc shape on one half edge of the double disk, and the side wall of the other half edge is a wavy surface. The support frame supports the side shaft and the worm gear. One end of the side shaft is connected to a row of teeth on the double disk through a fixed gear, and the other end of the side shaft is connected to a fixed bevel gear through a fixed bevel gear and a bevel gear fixed at one end of the worm gear.

[0011] The flat pipe comprises a neck tube with one end fixedly connected to the long main pipe, a valve seat with the other end fixedly connected to the neck tube, and a door plate for separating the internal passage of the valve seat, wherein the door plate slides through a flat tube arranged on one side of the valve seat.

[0012] The inclined pipeline includes a swimming cylinder, a floating tube, an active tube and a first rotating cylinder. One end of the floating tube is slidably inserted into the active tube, and the other end of the floating tube is vertically connected to the swimming cylinder. The end of the active tube away from the floating tube is vertically connected to the first rotating cylinder. One end of the swimming cylinder is hingedly connected to the middle of the spray frame, and one end of the first rotating cylinder is hingedly connected to the valve seat. The first rotating cylinder is connected by the helical teeth on the fixed cylinder gear and the worm. The spray frame is a frame-shaped channel tube body, and a plurality of discharge nozzles are evenly distributed on the channel tube body.

[0013] The suction device includes a door rod fixedly connected to the door panel, an L-shaped tube for sucking the door rod, a spring distributed in the L-shaped tube and used to support the door rod, a square flat tube vertically connected to the L-shaped tube, a telescopic plate that telescopes in the square flat tube, a pressure spring fixed in the square flat tube and used to support the telescopic plate, and two one-way valves arranged in the L-shaped tube, and the one-way valves are distributed on both sides of the square flat tube port, one end of the telescopic plate contacts the wavy surface on the double platter, one end of the door rod is slidably inserted into one end of the L-shaped tube, the support spring is intercepted by a fixed ring tube in the L-shaped tube, and the square flat tube is fixed to the other end of the L-shaped tube.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention installs a variety of monitoring components near each lithium battery to monitor the overheating or burning of the lithium battery. Once a problem occurs with the lithium battery, the monitoring components will send a signal in a timely manner, and the battery box will automatically process the inside, and the coolant fluid will be quickly positioned and transported to the jet rack. The jet rack outside the overheated or burning lithium battery will move around to emit the coolant fluid in a timely manner, wrap the lithium battery, cool the lithium battery, and at the same time isolate the heat from spreading to protect the surrounding lithium batteries.

[0015] 2. The present invention uses a moving spray rack to distribute coolant, so that the coolant can wrap the lithium battery. In addition, under normal working conditions, the spray rack will not affect the normal ventilation and heat dissipation of the lithium battery itself due to its simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system block diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the long integrator structure.

[0019] Figure 4 This is a schematic diagram of the semi-controlled integrated position.

[0020] Figure 5 This is a schematic diagram of the semi-controlled integrated structure.

[0021] Figure 6 Schematic diagram of the jet rack structure.

[0022] Figure 7 This is a schematic diagram of the double platter structure.

[0023] Figure 8 This is a schematic diagram of the inclined pipeline structure.

[0024] Fig. 9 This is a schematic diagram of the long main structure.

[0025] Fig.10 Schematic diagram of the jet rack location.

[0026] Fig.11 This is a schematic diagram of the suction device structure.

[0027] Fig.12 It is a schematic diagram of the telescopic plate structure.

[0028] Fig.13 Schematic diagram of the telescopic plate position.

[0029] In the figure: battery box shell 1, long integrator 2, lithium battery 3, jet frame 4, long main pipe 5, transfer assembly 6, semi-control integration 7, long shaft 8, controller 9, sub-plate frame 10, sub-shaft 11, transfer wheel 12, inclined pipeline 13, suction fixture 14, support group 15, pillar frame 16, flat pipeline 17, double platter 18, central control shaft 19, homing spring piece 20, flat column 21, side shaft 22, worm 23, door plate 24, neck tube 25, valve seat 26, swimming cylinder 27, swimming tube 28, active tube 29, first rotating cylinder 30, L-shaped tube 31, one-way valve 32, pressure spring piece 33, square flat cylinder 34, telescopic plate 35, spring 36, door rod 37. DETAILED DESCRIPTION

[0030] 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 technical solutions in 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.

[0031] See also Figures 1 to 13 The present invention provides a technical solution: a monitoring system for a lithium battery energy storage battery box, comprising a monitoring instrument integrated module for monitoring overheating or burning of batteries inside the battery box, a combined switch module for operating a motor and delivering a coolant, and a control module connected to the combined switch module. The control module is also connected to the monitoring instrument integrated module. When the monitoring instrument integrated module finds that the battery is overheated or burning, it will send a working signal to the combined switch module through the control module.

[0032] refer to Fig.10 A monitoring instrument integrated module unit is arranged on one side of each lithium battery 3, which is used to control the transmission of signals from the temperature sensor, the ultraviolet phototube and the smoke sensor, that is, to monitor whether the lithium battery 3 is overheated or burned through the temperature sensor, the ultraviolet phototube and the smoke sensor, and the joint switch module is used to control the operation of the motor and the coolant supply mechanism.

[0033] A protective device for a lithium battery energy storage battery box, comprising a battery box shell 1, a long integrator 2 and a row of lithium batteries 3 arranged on both sides of the long integrator 2, each lithium battery 3 is covered with a jet rack 4 for discharging a coolant, the long integrator 2 comprises a long main pipe 5 for conveying a coolant, a row of transfer assemblies 6 fixed on the long main pipe 5, two symmetrically distributed semi-control integrators 7 driven by each transfer assembly 6, and a long shaft 8 driving the row of transfer assemblies 6, one end of the long main pipe 5 extends to the outside of the battery box shell 1, the semi-control integrator 7 is connected between the long main pipe 5 and the jet rack 4, and one end of the long shaft 8 is connected to a driving motor arranged in the battery box shell 1.

[0034] refer to Figure 5 It is understood that the transfer assembly 6 includes a transfer frame 10, a transfer shaft 11 and a transfer wheel 12. One end of the transfer frame 10 is fixed on the long main pipe 5. The transfer frame 10 supports the transfer shaft 11. The long shaft 8 is connected to the cylindrical gear fixed on the transfer shaft 11 by means of helical teeth, and the long shaft 8 is movably sleeved in a circular hole opened on the transfer frame 10. Two transfer wheels 12 are fixed on the transfer shaft 11, and the end of the transfer shaft 11 is movably sleeved in a through hole opened on the transfer frame 10.

[0035] The transfer wheel 12 includes a disc body and a convex plate fixed at one edge of the disc body, and the transfer shaft 11 passes through the middle of the disc body of the transfer wheel 12 .

[0036] refer to Figure 5 It is understood that the semi-controlled integration 7 includes a flat pipe 17 fixedly connected to the long main pipe 5, an inclined pipe 13 connected between the flat pipe 17 and the jet frame 4, a suction device 14 for driving the flat pipe 17, a supporting group 15 transmission-connected between the inclined pipe 13 and the transfer wheel 12, and a support frame 16 for supporting the supporting group 15, and the support frame 16 is fixed on the long main pipe 5.

[0037] refer to Figure 7 It is understood that the supporting group 15 includes a flat column 21 that is in contact with the transfer wheel 12 for transmission, a return spring piece 20 that pushes the flat column 21, a central control shaft 19 that is transmission-connected to the flat column 21, and a double plate 18 that is fixedly sleeved on the central control shaft 19. The flat column 21 slides through the inner hole of the square cylinder fixed on the support frame 16, and one end of the return spring piece 20 is fixed on the square cylinder. One end of the central control shaft 19 is meshed and transmission-connected through a row of teeth arranged on the fixed cylinder gear and the flat column 21, and the other end of the central control shaft 19 is movably sleeved in a through hole opened on the support frame 16.

[0038] The supporting group 15 also includes a side shaft 22 and a worm 23. A row of teeth are distributed in an arc shape on one half edge of the double plate 18, and the side wall of the other half edge is a wavy surface. The support frame 16 supports the side shaft 22 and the worm 23. One end of the side shaft 22 is connected to a row of teeth on the double plate 18 through a fixed gear meshing transmission connection, and the other end of the side shaft 22 is connected to a bevel gear fixed at one end of the worm 23 through a fixed bevel gear meshing transmission connection. The side shaft 22 and the worm 23 are respectively movably sleeved in two column holes opened on the support frame 16.

[0039] The flat pipe 17 includes a neck tube 25 with one end fixedly connected to the long main pipe 5, a valve seat 26 with the other end fixedly connected to the neck tube 25, and a door plate 24 that blocks the internal channel of the valve seat 26. The door plate 24 slides through a flat tube arranged on one side of the valve seat 26.

[0040] The inclined pipe 13 includes a swimming cylinder 27, a floating tube 28, an active tube 29 and a first rotating cylinder 30. One end of the floating tube 28 is slidably inserted into the active tube 29, and the other end of the floating tube 28 is vertically connected to the swimming cylinder 27. The end of the active tube 29 away from the floating tube 28 is vertically connected to the first rotating cylinder 30. One end of the swimming cylinder 27 is hingedly connected to the middle of the spray frame 4, and one end of the first rotating cylinder 30 is hingedly connected to the valve seat 26. The first rotating cylinder 30 is connected by the helical teeth on the fixed cylinder gear and the worm 23. The spray frame 4 is a frame-shaped channel tube body, and a plurality of discharge nozzles are evenly distributed on the channel tube body.

[0041] The suction device 14 includes a door rod 37 fixedly connected to the door panel 24, an L-shaped tube 31 for sucking the door rod 37, a spring 36 distributed in the L-shaped tube 31 and used to support the door rod 37, a square flat tube 34 vertically connected to the L-shaped tube 31, a telescopic plate 35 telescopic in the square flat tube 34, a pressure spring 33 fixed in the square flat tube 34 and used to support the telescopic plate 35, and two one-way valves 32 arranged in the L-shaped tube 31, and the one-way valves 32 are distributed on both sides of the port of the square flat tube 34, one end of the telescopic plate 35 contacts the wavy surface on the double platter 18, one end of the door rod 37 is slidably inserted into one end of the L-shaped tube 31, and the support spring 36 is intercepted by a fixed ring tube in the L-shaped tube 31, and the square flat tube 34 is fixed at the other end of the L-shaped tube 31.

[0042] If a single lithium battery 3 overheats or burns, it will be detected by the nearest ultraviolet photoelectric tube, temperature sensor or smoke sensor, and the danger information will be sent to the controller 9. The controller 9 has a control module inside. The controller 9 makes a judgment and controls the coolant supply mechanism in the prior art to transport the coolant to the long main pipe 5. The coolant is a prior art material, such as the low-temperature fluid in a fire extinguisher. The fluid in the long main pipe 5 is transported to all the flat pipes 17. Only the jet rack 4 on the side of the detection device that sends the signal will eventually discharge the coolant, and the jet rack 4 will reciprocate around the lithium battery 3 so that the refrigerant can quickly disperse around the lithium battery 3 to cool it down.

[0043] The transmission process of the reciprocating motion of the jet frame 4: the rotation of the long shaft 8 drives the sub-shaft 11, and then controls the rotation of the sub-wheel 12. There is a selection mechanism here. There are two rows of opposite sub-wheels 12 on the transmission route of the long shaft 8. The convex plate position on each sub-wheel 12 is different, so that the long shaft 8 can control the number of rotations. The number of rotations of the long shaft 8 depends on the position of the detection instrument that issues the danger limit signal. The rotation of the long shaft 8 can only control the convex plate of a single sub-wheel 12 to move the flat column 21 on one side, so as to achieve positioning, that is, only control the support group 1 at one end of the overheated or burning lithium battery 3 The transmission is triggered, that is, the flat column 21 reciprocates under the toggle of the convex plate of the transfer wheel 12, and the flat column 21 translates to drive the central control shaft 19 to rotate, and then drives the side shaft 22 through the double plate 18, and then drives the first rotating cylinder 30 to reciprocate through the worm 23, causing the active tube 29 to swing, and the floating tube 28 can be extended and retracted in the active tube 29. The floating tube 28 drives the jet frame 4 to move back and forth through the swimming cylinder 27 with the swing, so that the coolant in the jet frame 4 is emitted, wraps the lithium battery 3, isolates the temperature, and protects the surrounding lithium batteries 3.

[0044] The convex plate on the transfer wheel 12 continuously reciprocates the flat column 21, and the subsequent transmission causes the jet frame 4 to continuously reciprocate. During the process, the reciprocating rotation of the double plate 18 will move the telescopic plate 35, and the telescopic plate 35 continuously retracts in the square flat cylinder 34, causing the air flow in the L-shaped tube 31 to move. The one-way valve 32 is a one-way air valve in the prior art. The continuous extension and contraction of the telescopic plate 35 provides power for air flow delivery. The air in the L-shaped tube 31 is gradually extracted, and the negative pressure in the L-shaped tube 31 acts on the door rod 37. The door rod 37 retracts into the L-shaped tube 31, and the door rod 37 pulls the door plate 24, and the door plate 24 is extracted from the valve seat 26, and the channel of the valve seat 26 is opened. 5, the coolant fluid flows through the neck tube 25 and the valve seat 26, and then is injected into the jet rack 4 through the internal channel of the inclined pipe 13, and then discharged outward. Here, the valve spring of the one-way valve 32 is provided with a slow reflux pore. Once the telescopic plate 35 stops moving, the door rod 37 will gradually extend under the pressure of the spring 36, and the door plate 24 will fall again to block the valve seat 26 channel. That is, only when the jet rack 4 continues to move, the coolant supply and delivery channel of the jet rack 4 will be unobstructed. In summary, the jet rack 4 outside the overheated or burning lithium battery 3 will move, and while moving, the coolant transported in the long main pipe 5 will be automatically drained into this jet rack 4.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A monitoring system for a lithium battery energy storage battery box, characterized in that: It includes a monitoring instrument integrated module for monitoring overheating or burning of batteries inside the battery box, a combined switch module for operating the motor and delivering coolant, and a control module connected to the combined switch module. The control module is also connected to the monitoring instrument integrated module. When the monitoring instrument integrated module finds that the battery is overheating or burning, it will send a working signal to the combined switch module through the control module.

2. A protection device for a lithium battery energy storage box, used in a monitoring system for a lithium battery energy storage box according to claim 1, comprising a battery box shell (1), characterized in that: The battery box shell (1) is provided with a long integrator (2) and a row of lithium batteries (3) arranged on both sides of the long integrator (2). Each lithium battery (3) is covered with a jet rack (4) for discharging coolant. The long integrator (2) comprises a long main pipe (5) for conveying coolant, a row of transfer assemblies (6) fixed on the long main pipe (5), two symmetrically distributed semi-controlled integrators (7) driven by each transfer assembly (6), and a long shaft (8) for driving the row of transfer assemblies (6). One end of the long main pipe (5) extends to the outside of the battery box shell (1), and the semi-controlled integrator (7) is connected between the long main pipe (5) and the jet rack (4).

3. A protection device for a lithium battery energy storage battery box according to claim 2, characterized in that: The transfer assembly (6) comprises a transfer frame (10), a transfer shaft (11) and a transfer wheel (12). One end of the transfer frame (10) is fixed to the long main pipe (5). The transfer frame (10) supports the transfer shaft (11). The long shaft (8) is meshed and driven with a cylindrical gear fixed on the transfer shaft (11) through a spiral tooth arrangement. The long shaft (8) is movably sleeved in a circular hole provided on the transfer frame (10). Two transfer wheels (12) are fixed on the transfer shaft (11).

4. The protection device for a lithium battery energy storage box according to claim 3, characterized in that: The transfer wheel (12) comprises a disc body and a convex plate fixed to an edge of one side of the disc body, and the transfer shaft (11) passes through the middle of the disc body of the transfer wheel (12).

5. A protection device for a lithium battery energy storage box according to claim 4, characterized in that: The semi-controlled integration (7) comprises a flat pipe (17) fixedly connected to the long main pipe (5), an inclined pipe (13) connected between the flat pipe (17) and the jet frame (4), a suction device (14) for driving the flat pipe (17), a supporting group (15) drivingly connected between the inclined pipe (13) and the transfer wheel (12), and a support frame (16) for supporting the supporting group (15), wherein the support frame (16) is fixed on the long main pipe (5).

6. A protection device for a lithium battery energy storage box according to claim 5, characterized in that: The supporting group (15) includes a flat column (21) that is in contact with the transfer wheel (12), a return spring (20) that pushes the flat column (21), a central control shaft (19) that is transmission-connected to the flat column (21), and a double plate (18) that is fixedly sleeved on the central control shaft (19). The flat column (21) slides through the inner hole of a square cylinder fixed on the support frame (16), and one end of the return spring (20) is fixed on the square cylinder. One end of the central control shaft (19) is meshed and transmission-connected with a row of teeth arranged on the fixed cylinder gear and the flat column (21), and the other end of the central control shaft (19) is movably sleeved in a through hole opened on the support frame (16).

7. A protection device for a lithium battery energy storage box according to claim 6, characterized in that: The supporting assembly (15) further comprises a side shaft (22) and a worm (23); a row of teeth are distributed in an arc shape on one half edge of the double plate (18); and a side wall of the other half edge is a wavy surface; a support frame (16) supports the side shaft (22) and the worm (23); one end of the side shaft (22) is meshed and driven with a row of teeth on the double plate (18) through a fixed gear; and the other end of the side shaft (22) is meshed and driven with a fixed bevel gear at one end of the worm (23) through a fixed bevel gear.

8. The protection device for a lithium battery energy storage box according to claim 7, characterized in that: The flat pipe (17) comprises a neck tube (25) having one end fixedly connected to the long main pipe (5), a valve seat (26) fixedly connected to the other end of the neck tube (25), and a door plate (24) for blocking the internal passage of the valve seat (26), wherein the door plate (24) slides through a flat tube arranged on one side of the valve seat (26).

9. A protection device for a lithium battery energy storage box according to claim 8, characterized in that: The inclined pipe (13) comprises a swimming cylinder (27), a floating tube (28), an active tube (29) and a first rotating cylinder (30); one end of the floating tube (28) is slidably inserted into the active tube (29); the other end of the floating tube (28) is vertically connected to the swimming cylinder (27); one end of the active tube (29) away from the floating tube (28) is vertically connected to the first rotating cylinder (30); one end of the swimming cylinder (27) is hingedly connected to the middle of the spray frame (4); one end of the first rotating cylinder (30) is hingedly connected to the valve seat (26); the first rotating cylinder (30) is connected to the fixed cylinder gear and the helical teeth on the worm (23) through meshing transmission; the spray frame (4) is a frame-shaped channel tube body, and a plurality of discharge nozzles are evenly distributed on the channel tube body.

10. The protection device for a lithium battery energy storage box according to claim 8, characterized in that: The suction device (14) comprises a door rod (37) fixedly connected to the door plate (24), an L-shaped tube (31) for sucking the door rod (37), a spring (36) distributed in the L-shaped tube (31) and used to support the door rod (37), a square flat tube (34) vertically connected to the L-shaped tube (31), a telescopic plate (35) telescopic in the square flat tube (34), a pressure spring (33) fixed in the square flat tube (34) and used to support the telescopic plate (35), and two one-way valves (32) arranged in the L-shaped tube (31), wherein the one-way valves (32) are distributed on both sides of the port of the square flat tube (34), one end of the telescopic plate (35) contacts the wave surface on the double platter (18), one end of the door rod (37) is slidably inserted into the interior of one end of the L-shaped tube (31), the support spring (36) is intercepted by a fixed ring tube in the L-shaped tube (31), and the square flat tube (34) is fixed to the other end of the L-shaped tube (31).

Images