A modular gas generator set

Abstract

The present invention relates to the technical field of gas-fired power generation, and in particular to a modular gas-fired power generation set, including a protective shell, a power generation mechanism is arranged in the protective shell, the protective shell includes a top plate and a bottom plate, a front plate, a rear plate, a first side plate and a second side plate are installed between the top plate and the bottom plate, the front plate and the rear plate are arranged oppositely, and the first side plate and the second side plate are arranged oppositely; the front plate is installed with a display panel and a control module; the rear plate is provided with a power output port, an air inlet and a gas inlet; the first side plate is installed with a preheating module and an air outlet; the bottom plate is provided with an energy storage battery. In this way, the heat in the exhaust gas and the engine oil is transferred to the low-temperature air by using the preheating module, so that the low-temperature air is converted into high-temperature air before burning with the combustible gas, thereby ensuring the power generation efficiency of the gas.

Description

Technical Field

[0001] The present invention relates to the technical field of gas power generation, and in particular to a modular gas power generation unit. Background Art

[0002] Gas generator set is a new type of power generation equipment that uses liquefied gas, natural gas and other combustible gases as combustion materials instead of gasoline and diesel as engine power.

[0003] Compared with traditional diesel generators, gas generators have the advantages of environmental protection and energy saving, low operating costs, and good starting performance. However, due to the large size of traditional gas generators, it is difficult to carry, so it is difficult to use as a daily emergency power source. Therefore, how to reduce the size of existing gas generators to make them easier to carry and to facilitate the replacement of existing small diesel generators is the problem we are facing.

[0004] In this regard, a Chinese patent with publication number "CN216788546U" discloses "a portable gas generator", which discloses "a shell, the shell is provided with an air inlet window and an air outlet window, a working unit mainly composed of an engine and a stator and rotor assembly is installed inside the shell, and a mounting cavity for mounting a gas cylinder is provided on the shell, the mounting cavity is located on a side of the shell where the air inlet window is provided, and a mounting bracket for fixing the gas cylinder and a gas outlet seat for cooperating with the gas outlet nozzle of the gas cylinder are provided in the mounting cavity. This solution solves the problem of insufficient safety of portable gas generators in the prior art."

[0005] However, the above structure abandons many auxiliary structures for the convenience of miniaturization, such as the muffler mechanism and the waste heat recovery mechanism. Taking the waste heat recovery mechanism as an example, its function is to use the waste heat generated by the generator to preheat the air and gas entering the combustion chamber in a low-temperature environment, reduce heat loss, and improve energy utilization. If this structure is omitted, the power generation of the generator in a low-temperature environment will decrease.

[0006] In this regard, the current problem is how to ensure that the gas generator is portable while ensuring that its power generation does not drop too much in a low-temperature environment. Summary of the invention

[0007] In view of the above defects, the purpose of the present invention is to provide a modular gas generator set, aiming to solve the problem in the prior art that the power generation of gas generators will decrease in low temperature environments.

[0008] In order to solve the above technical problems, the technical solution of the present invention is:

[0009] A modular gas generator set comprises a protective shell, in which a power generating mechanism is arranged, the protective shell comprises a top plate and a bottom plate, a front end plate, a rear end plate, a first side plate and a second side plate are installed between the top plate and the bottom plate, the front end plate and the rear end plate are arranged opposite to each other, and the first side plate and the second side plate are arranged opposite to each other; the front end plate is installed with a display panel and a control module; the rear end plate is provided with a power output port, an air inlet and a gas inlet; the first side plate is installed with a preheating module and an air outlet; the bottom plate is provided with an energy storage battery.

[0010] Wherein, the preheating module includes a sealing shell, the first side plate is provided with an installation opening matching the sealing shell, the installation opening is covered with a sealing plate, a plurality of guide holes are arranged on the circumference of the installation opening, a secondary lubricating oil pipeline, a secondary exhaust gas pipeline and a secondary air intake pipeline are arranged between the sealing plate and the installation opening, both ends of the secondary lubricating oil pipeline, the secondary exhaust gas pipeline and the secondary air intake pipeline all pass through the guide holes, both ends of the secondary lubricating oil pipeline are connected to the power generation mechanism; one end of the secondary exhaust gas pipeline is connected to the power generation mechanism, and the other end of the secondary exhaust gas pipeline is connected to the air outlet; one end of the secondary air intake pipeline is connected to the air inlet, and the other end of the secondary air intake pipeline is connected to the power generation mechanism.

[0011] Wherein, a heat transfer medium is arranged in the sealing shell, the secondary lubricating oil pipeline, the secondary exhaust gas pipeline and the secondary air intake pipeline are all located in the sealing shell, and the sealing shell is located between the sealing plate and the mounting port.

[0012] Among them, a first adapter is arranged between the guide hole and the sealing shell, a second adapter is installed on the circumference of the sealing shell, a sealing cover is slidably arranged on one end of the first adapter toward the second adapter, the sealing cover includes a first inner cavity and a second inner cavity, an internal thread is arranged on the end of the first inner cavity away from the second inner cavity, an internal thread is arranged on the inner wall of the second inner cavity, the first adapter includes a clamp and a connecting pipe, the second adapter includes a connecting head, external threads are arranged on the outer walls of the connecting pipe and the connecting head, the clamp is slidably connected to the first inner cavity, the connecting pipe is threadedly connected to the second inner cavity, and the connecting pipe is threadedly connected to the first inner cavity.

[0013] Wherein, the sealing shell comprises an interlayer, and the interlayer is filled with thermal insulation foam.

[0014] Among them, the sealing plate is recessed on one side facing the installation port and the other side away from the installation port to form a sealing groove, an elastic cushion is arranged on the inner wall of the sealing groove, a limiting hole is opened on the side wall of the sealing groove, and the limiting hole is arranged in coordination with the guide hole.

[0015] Among them, a limiting plate is slidably installed in the limiting hole, and the end of the limiting plate facing the second adapter is an arc-shaped surface, a sealing pad is arranged on the arc-shaped surface, a supporting groove is arranged on the side wall of the sealing groove, a supporting spring is installed in the supporting groove, and the end of the limiting plate away from the arc-shaped surface is connected to the supporting spring.

[0016] The air outlet comprises an induced ventilator and a sealing net, wherein the induced ventilator is located at one end of the sealing net facing the power generating mechanism, a silencer is provided at one end of the sealing net away from the induced ventilator, and a retractable cover is provided between the silencer and the sealing net.

[0017] Among them, a plurality of fixed arrays are arranged on the outer wall of the first side plate, and the fixed array includes a plurality of horizontally arranged fixing holes. A fixed ring is arranged on the circumference of the muffler, and the fixed ring includes an inner ring body and an outer ring body. The inner ring body includes a plurality of fixed grooves. A fixed platform is arranged in the fixed groove, and one end of the fixed platform is rotatably connected to the fixed groove, and a compression spring is arranged between the other end of the fixed platform and the fixed groove.

[0018] Wherein, the outer ring body includes a U-shaped plug plate, and the U-shaped plug plate is plugged into the fixing hole.

[0019] After adopting the above technical solution, the beneficial effects of the present invention are:

[0020] First, the preheating module is used to transfer the heat in the exhaust gas and engine oil to the low-temperature air, so that the low-temperature air is converted into high-temperature air before burning with the combustible gas, ensuring the power generation efficiency of the gas. Second, a muffler is introduced to guide the exhaust gas and reduce the noise generated when the exhaust gas is discharged. Third, an oxygen tank is introduced to facilitate the normal operation of the device in the oxygen-deficient environment of the plateau. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the internal structure diagram of the protective shell;

[0022] Figure 2 is a structural diagram of the first side panel;

[0023] Figure 3 is a structural diagram of the sealing shell;

[0024] Figure 4 is a structural diagram of the sealing cover;

[0025] Figure 5 This is a structural diagram of the adapter;

[0026] Figure 6 It is the structural diagram of the limit plate;

[0027] Figure 7 This is the structural diagram of the muffler;

[0028] Figure 8 is a top view of the fixing hole;

[0029] Fig. 9 is a top view of the fixing ring;

[0030] Fig.10 This is the structural diagram of the fixed station;

[0031] Fig.11 This is a structural diagram of the energy storage battery.

[0032] In the figure: 11-top plate, 12-bottom plate, 13-front plate, 131-display panel, 132-control module, 14-rear plate, 141-power output port, 142-air inlet, 143-gas inlet, 15-first side plate, 151-preheating module, 152-air outlet, 153-sealing shell, 154-sealing plate, 1514-limiting hole, 1542-limiting plate, 1543-support groove, 1544-support spring, 1545-arc surface, 155-guide hole, 156-secondary lubricating oil pipeline, 157-secondary exhaust gas pipeline, 158-secondary air intake pipeline, 159-heat transfer medium, 160-sealing cover, 1601- First inner cavity, 1602-second inner cavity, 161-first adapter, 1611-clamp, 1612-connecting pipe, 162-second adapter, 1621-connecting head, 163-sealing gasket, 164-induction fan, 165-sealing net, 166-muffler, 167-folding cover, 168-fixing hole, 169-fixing ring, 1691-inner ring body, 1692-outer ring body, 1693-fixing platform, 1694-fixing groove, 1695-compression spring, 170-U-shaped plug plate, 180-mounting shell, 181-conductive column, 190-energy storage battery, 1901-mounting frame, 1902-protrusion, 1903-conductive hole. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0034] Example:

[0035] like Figure 1-4 As shown, a modular gas generator set includes a protective shell, in which a power generation mechanism is arranged. The power generation mechanism consists of a turbine, a mixing chamber, a combustion chamber and a generator, which is a mature prior art, so this solution will not be described in detail.

[0036] In the present embodiment, the protective shell includes a top plate 11 and a bottom plate 12, a front end plate 13, a rear end plate 14, a first side plate 15 and a second side plate are installed between the top plate 11 and the bottom plate 12, the front end plate 13 and the rear end plate 14 are arranged opposite to each other, and the first side plate 15 and the second side plate are arranged opposite to each other; the front end plate 13 is installed with a display panel 131 and a control module 132; the rear end plate 14 is provided with a power output port 141, an air inlet 142 and a gas inlet 143; the first side plate 15 is installed with a preheating module 151 and an air outlet 152; the bottom plate 12 is provided with an energy storage battery 190. The control module 132, display panel 131, power output port 141 and power generation mechanism in this solution are all electrically connected to the energy storage battery 190. The purpose is to facilitate the power generation mechanism to power the energy storage battery 190, and to facilitate the energy storage battery 190 to supply power to the display panel 131 and the control module 132 when the power generation mechanism is not working, so as to facilitate the normal use of both and realize the electric start of the power generation mechanism.

[0037] In this solution, the preheating module 151 and the energy storage battery 190 are modular optional mechanisms, that is, they can be added according to personal needs. The preheating module 151 is generally installed when the gas generator set is in a low temperature environment. Its purpose is to use the preheating generated when the power generating mechanism is working to heat the air, so that the temperature of the air is pre-raised when assisting the combustion of combustible gas, reducing energy waste.

[0038] When the preheating module 151 is installed, the air reaches the air inlet 142, the preheating module 151, the mixing chamber of the power generation mechanism, and the combustion chamber in sequence, and then becomes exhaust gas and is discharged through the air outlet 152. In this process, the exhaust gas is high-temperature exhaust gas, which is introduced into the preheating module 151, and the low-temperature air entering the air inlet 142 is heated by the exhaust gas. The low-temperature air becomes high-temperature air after heating, and the high-temperature air is mixed with the combustible gas that reaches the power generation mechanism through the gas inlet 143 in the mixing chamber. In this process, the combustible gas will be heated, and the thermal efficiency of the combustion of the combustible gas after ignition is guaranteed.

[0039] The preheating module includes a sealing shell. In order to facilitate the installation of the sealing shell 153 when needed, the first side plate 15 is provided with an installation port matching the sealing shell 153. The installation port is covered with a sealing plate 154. A plurality of guide holes 155 are arranged on the circumference of the installation port. A secondary lubricating oil pipeline 156, a secondary exhaust gas pipeline 157 and a secondary air intake pipeline 158 are arranged between the sealing plate 154 and the installation port. Both ends of the secondary lubricating oil pipeline 156, the secondary exhaust gas pipeline 157 and the secondary air intake pipeline 158 pass through the guide holes 155. Both ends of the secondary lubricating oil pipeline 156 are connected to the power generation mechanism; one end of the secondary exhaust gas pipeline 157 is connected to the power generation mechanism, and the other end of the secondary exhaust gas pipeline 157 is connected to the air outlet 152; one end of the secondary air intake pipeline 158 is connected to the air inlet 142, and the other end of the secondary air intake pipeline 158 is connected to the power generation mechanism. In order to facilitate the installation of the sealing shell 153, the present solution introduces the installation port and the sealing plate 154. However, in an environment above -5°C, the low-temperature air generally does not need to be heated, and the preheating module 151 does not need to be installed at this time, so it is necessary to reserve pipes for the lubricating oil, exhaust gas and air circulation, while reducing the speed at which the air is heated.

[0040] When the air needs to be heated, we need to install the sealed shell 153. At this time, a heat transfer medium 159 is arranged in the sealed shell 153. The secondary lubricating oil pipe 156, the secondary exhaust gas pipe 157 and the secondary air intake pipe 158 are all located in the sealed shell 153. The sealed shell 153 is located between the sealing plate 154 and the installation port. The function of the secondary lubricating oil pipe is to lead out the high-temperature oil in the power generating mechanism, so that the high-temperature oil exchanges heat with the heat transfer medium 159 in the sealed shell 153, and uses the heat of the high-temperature oil and the exhaust gas to heat the low-temperature air at the same time, thereby ensuring the heating efficiency of the low-temperature air.

[0041] like Figure 5As shown, in the present solution, the secondary lubrication pipeline, the secondary exhaust pipeline 157 and the secondary air intake pipeline 158 are all detachable in design, and they need to be removed in advance when installing the sealing shell 153. In order to facilitate ventilation, corresponding pipelines are installed in the sealing shell 153. In order to facilitate the connection of the secondary lubrication pipeline, the secondary exhaust pipeline 157 and the secondary air intake pipeline 158 pre-buried in the sealing shell 153 to the existing pipeline, a first adapter 161 is arranged between the guide hole 155 and the sealing shell 153, and a second adapter 162 is installed in the circumference of the sealing shell 153. A sealing cover 160 is slidably arranged on one end of the first adapter 161 toward the second adapter 162, and the sealing cover 160 includes a first inner cavity 1601 and a second inner cavity 1602, and the first inner cavity 1601 is away from the second inner cavity 1602. One end of the second inner cavity 1602 is provided with an internal thread, the inner wall of the second inner cavity 1602 is provided with an internal thread, the first adapter 161 includes a clamp 1611 and a connecting pipe 1612, the second adapter 162 includes a connecting head 1621, and the outer walls of the connecting pipe 1612 and the connecting head 1621 are both provided with external threads, the clamp 1611 is slidably connected to the first inner cavity 1601, the connecting pipe 1612 is threadedly connected to the second inner cavity 1602, and the connecting pipe 1612 is threadedly connected to the first inner cavity 1601. When the sealing cover 160 is not connected to the second adapter 162 and the first adapter 161, the sealing cover 160 will be slidably set on the first adapter 161. When the first adapter 161 and the second adapter 162 need to be connected, the sealing cover 160 is slid toward the direction of the second adapter 162. After reaching the bottom, the sealing cover 160 is rotated. One end of the sealing cover 160 will be threadedly connected to the first adapter 161, and the other end of the sealing cover 160 will be sealed and connected to the second adapter 162.

[0042] Sealing gaskets 163 are provided between the clamp head 1611 and the first cavity, and between the connecting pipe 1612 and the first cavity.

[0043] In order to conveniently keep the heat transfer medium 159 warm, the sealing shell 153 includes an interlayer filled with heat-insulating foam.

[0044] like Figure 6 As shown, in order to facilitate the installation of the first adapter 161 and the second adapter 162, the sealing plate 154 is recessed on one side facing the installation port and the other side facing the installation port to form a sealing groove, an elastic cushion is provided on the inner wall of the sealing groove, and a limiting hole 1514 is provided on the side wall of the sealing groove, and the limiting hole 1514 is arranged in cooperation with the guide hole 155.

[0045] In order to facilitate sealing the area between the limit hole 1514 and the adapter, a limit plate 1542 is slidably installed in the limit hole 1514, and the end of the limit plate 1542 facing the second adapter 162 is an arc surface 1545, and a sealing cushion is arranged on the arc surface 1545. A support groove 1543 is arranged on the side wall of the sealing groove, and a support spring 1544 is installed in the support groove 1543. The end of the limit plate 1542 away from the arc surface 1545 is connected to the support spring 1544.

[0046] After solving the preheating problem, we also need to consider reducing noise. The air outlet 152 includes an induced draft fan 164 and a sealing net 165. The induced draft fan 164 is located at one end of the sealing net 165 facing the power generation mechanism. The end of the sealing net 165 away from the induced draft fan 164 is provided with a muffler 166. A collection cover 167 is provided between the muffler 166 and the sealing net 165. The collection cover 167 is trumpet-shaped, and the end with a larger area covers the sealing net 165.

[0047] like Figure 7-10 As shown, in order to facilitate the fixation of the silencer 166, a plurality of fixing arrays are arranged on the outer wall of the first side panel 15, and the fixing arrays include a plurality of horizontally arranged fixing holes 168. A fixing ring 169 is arranged on the circumference of the silencer 166, and the fixing ring 169 includes an inner ring body 1691 and an outer ring body 1692. The inner ring body 1691 includes a plurality of fixing grooves 1694. A fixing platform 1693 is arranged in the fixing groove 1694, and one end of the fixing platform 1693 is rotatably connected to the fixing groove 1694, and a compression spring 1695 is arranged between the other end of the fixing platform 1693 and the fixing groove 1694.

[0048] Preferably, the outer ring body 1692 includes a U-shaped plug plate 170 , and the U-shaped plug plate 170 is plugged into the fixing hole 168 .

[0049] like Fig.11 As shown, in order to facilitate the electric start of the generator, we need to set a battery pack on the gas generator for energy storage. To this end, a mounting shell 180 is hoisted at one end of the bottom plate 12 away from the top plate 11, and a conductive column 181 cooperating with the energy storage battery 190 is provided at the other end of the mounting shell 180. A sliding groove is provided on the inner wall of the mounting shell 180, and a mounting frame 1901 is provided at the bottom of the energy storage battery 190. Both ends of the mounting frame 1901 are provided with protrusions 1902, and the protrusions 1902 are slidably set in the sliding groove. A conductive hole 1903 is provided at one end of the mounting frame 1901 facing the conductive column 181, and the conductive column 181 is plugged into the conductive hole 1903.

[0050] In plateau areas, due to the low oxygen environment, this will lead to incomplete combustion of combustible gas. In order to avoid this problem, we need to introduce combustion-supporting gas. For this purpose, the outer wall of the first side panel 15 is also provided with a support platform, and an oxygen cylinder is installed on the support platform. An oxygen inlet pipe is provided in the sealed shell 153, one end of the oxygen inlet pipe is connected to the outlet end of the oxygen cylinder, and the other end of the oxygen inlet pipe is connected to the power generation structure.

[0051] In summary, this solution has the following advantages: First, the preheating module 151 is used to transfer the heat in the exhaust gas and engine oil to the low-temperature air, so that the low-temperature air is converted into high-temperature air before burning with the combustible gas, thereby ensuring the power generation efficiency of the gas. Second, the muffler 166 is introduced to guide the exhaust gas, thereby reducing the noise generated when the exhaust gas is discharged. Third, the oxygen tank is introduced to facilitate the normal operation of the device in the oxygen-deficient environment of the plateau.

[0052] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present invention.

Claims

1. A modular gas generator set, characterized in that: The invention comprises a protective shell, wherein a power generating mechanism is arranged in the protective shell, and the protective shell comprises a top plate (11) and a bottom plate (12), wherein a front plate (13), a rear plate (14), a first side plate (15) and a second side plate are installed between the top plate (11) and the bottom plate (12), wherein the front plate (13) and the rear plate (14) are arranged opposite to each other, and the first side plate (15) and the second side plate are arranged opposite to each other; the front plate (13) is installed with a display panel (131) and a control module (132); the rear plate (14) is provided with a power output port (141), an air inlet (142) and a gas inlet (143); the first side plate (15) is installed with a preheating module (151) and an air outlet (152); and the bottom plate (12) is provided with an energy storage battery (190); The preheating module (151) comprises a sealing shell (153); the first side plate (15) is provided with a mounting opening matching the sealing shell (153); the mounting opening is covered with a sealing plate (154); a plurality of guide holes (155) are provided in the circumferential direction of the mounting opening; a secondary lubricating oil pipeline (156), a secondary exhaust gas pipeline (157) and a secondary air intake pipeline (158) are provided between the sealing plate (154) and the mounting opening; the secondary lubricating oil pipeline (156), the secondary exhaust gas pipeline (157) and the secondary air intake pipeline (158) are provided (157) and both ends of the secondary air intake pipe (158) pass through the guide hole (155), and both ends of the secondary lubricating oil pipe (156) are connected to the power generation mechanism; one end of the secondary exhaust pipe (157) is connected to the power generation mechanism, and the other end of the secondary exhaust pipe (157) is connected to the air outlet (152); one end of the secondary air intake pipe (158) is connected to the air inlet hole (142), and the other end of the secondary air intake pipe (158) is connected to the power generation mechanism; A heat transfer medium (159) is arranged in the sealing shell (153); the secondary lubricating oil pipeline (156), the secondary exhaust gas pipeline (157) and the secondary air intake pipeline (158) are all located in the sealing shell (153); and the sealing shell (153) is located between the sealing plate (154) and the mounting port; The air outlet (152) comprises an induced induced fan (164) and a sealing net (165); the induced induced fan (164) is located at one end of the sealing net (165) facing the power generating mechanism; a muffler pipe (166) is provided at one end of the sealing net (165) away from the induced induced fan (164); and a retractable cover (167) is provided between the muffler pipe (166) and the sealing net (165); A plurality of fixing arrays are arranged on the outer wall of the first side plate (15), the fixing arrays comprising a plurality of fixing holes (168) arranged horizontally, a fixing ring (169) is arranged on the circumference of the muffler (166), the fixing ring (169) comprising an inner ring body (1691) and an outer ring body (1692), the inner ring body (1691) comprising a plurality of fixing grooves (1694), a fixing platform (1693) is arranged in the fixing groove (1694), one end of the fixing platform (1693) is rotatably connected to the fixing groove (1694), and a compression spring (1695) is arranged between the other end of the fixing platform (1693) and the fixing groove (1694); The outer ring body (1692) comprises a U-shaped plug plate (170), and the U-shaped plug plate (170) is plugged into the fixing hole (168).

2. A modular gas generator set according to claim 1, characterized in that: A first adapter (161) is provided between the guide hole (155) and the sealing shell (153); a second adapter (162) is installed in the circumferential direction of the sealing shell (153); a sealing cover (160) is provided on one end of the first adapter (161) so as to slide toward the second adapter (162); the sealing cover (160) comprises a first inner cavity (1601) and a second inner cavity (1602); an end of the first inner cavity (1601) away from the second inner cavity (1602) is provided with an internal thread; and the second inner cavity (1602) is provided with a sealing cover (160) which is slidable toward the second inner cavity (1602). ) is provided with an internal thread on its inner wall, the first adapter (161) includes a clamping head (1611) and a connecting tube (1612), the second adapter (162) includes a connecting head (1621), and the connecting tube (1612) and the connecting head (1621) are provided with external threads on their outer walls, the clamping head (1611) is slidably connected to the first inner cavity (1601), the connecting tube (1612) is threadedly connected to the second inner cavity (1602), and the connecting tube (1612) is threadedly connected to the first inner cavity (1601).

3. A modular gas generator set according to claim 2, characterized in that: The sealing shell (153) comprises an interlayer, and the interlayer is filled with thermal insulation foam.

4. A modular gas-fired generator set according to claim 3, characterized in that: A side of the sealing plate (154) facing the installation opening is recessed toward a side of the sealing plate (154) away from the installation opening to form a sealing groove, an elastic cushion is provided on the inner wall of the sealing groove, a limiting hole (1514) is provided on the side wall of the sealing groove, and the limiting hole (1514) is arranged in coordination with the guide hole (155).

5. A modular gas-fired generator set according to claim 4, characterized in that: A limiting plate (1542) is slidably installed in the limiting hole (1514); one end of the limiting plate (1542) facing the second adapter (162) is an arcuate surface (1545); a sealing cushion is provided on the arcuate surface (1545); a supporting groove (1543) is provided on the side wall of the sealing groove; a supporting spring (1544) is installed in the supporting groove (1543); and one end of the limiting plate (1542) away from the arcuate surface (1545) is connected to the supporting spring (1544).

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