A linkage switching valve and light / heavy oil switching system

Abstract

The application discloses a linkage switching valve, comprising: a valve body, which is provided with a total medium inlet, a first medium inlet and a second medium inlet, which are communicated with each other, and a total medium outlet, a first medium outlet and a second medium outlet, which are communicated with each other; a valve core assembly, when being in a first position, the valve core assembly cuts off the communication relationship between the total medium inlet and the first medium inlet, and the communication relationship between the total medium outlet and the first medium outlet; when being in a second position, the valve core assembly cuts off the communication relationship between the total medium inlet and the second medium inlet, and the communication relationship between the total medium outlet and the second medium outlet. The application can realize the switching of the oil inlet and return paths of light oil and heavy oil at the same time, avoid the fuel supply shortage, engine shutdown and other faults caused by missing operation, realize the simultaneous switching of the oil inlet and return paths of light oil and heavy oil by only operating one valve, and reduce the labor intensity of the operator. The application further discloses a light and heavy oil switching system.

Description

Technical Field

[0001] This invention relates to the field of marine engine technology, and in particular to a linkage switching valve and a light / heavy fuel switching system. Background Technology

[0002] To save costs during daily use, large marine engines generally use heavy diesel oil (HFO) when operating normally in deep-sea areas, while using ordinary diesel oil (MDO) or light diesel oil (MGO) when near the coast or docked in ports. For ease of understanding, heavy diesel oil (HFO) will be referred to as heavy oil, and ordinary diesel oil (MDO) and light diesel oil (MGO) will be referred to as light oil.

[0003] The external piping system of a marine engine includes the engine inlet fuel line, engine return fuel line, heavy fuel tank outlet fuel line, heavy fuel tank return fuel line, light fuel tank outlet fuel line, and light fuel tank return fuel line. The heavy fuel tank outlet fuel line and the light fuel tank outlet fuel line are connected to the engine inlet fuel line via a manual three-way valve 04. The heavy fuel tank outlet fuel line and the light fuel tank outlet fuel line are connected to heavy fuel tank 01 and light fuel tank 02, respectively. The heavy fuel tank return fuel line and the light fuel tank return fuel line are connected to the engine return fuel line via a manual three-way valve. These two manual three-way valves are usually located in the engine compartment. When fuel switching is required, operators must enter the engine compartment to operate both manual three-way valves, which is time-consuming and labor-intensive. If only one operator is available, one manual three-way valve must be switched first, then the other, making simultaneous operation impossible and posing a risk of missed operations.

[0004] In addition, when the ship suddenly loses power, the heavy oil heating device will fail. If the operators do not switch to light oil mode in time, it will cause the fuel line to become blocked, which will in turn cause the engine to stop.

[0005] Therefore, how to reduce the labor intensity during the switching between light and heavy oil and avoid the risk of omissions in operation is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a linkage switching valve to reduce the labor intensity when switching between light and heavy oil and to avoid the risk of missing operations.

[0007] Another object of the present invention is to provide a light and heavy oil switching system including the above-mentioned linkage switching valve.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A linkage switching valve, comprising:

[0010] The valve body has interconnected media inlet, first media inlet and second media inlet, as well as interconnected media outlet, first media outlet and second media outlet;

[0011] A valve core assembly is slidably disposed within the valve body. When the valve core assembly is in a first position, the valve core assembly cuts off the communication between the main medium inlet and the first medium inlet, as well as the communication between the main medium outlet and the first medium outlet. When the valve core assembly is in a second position, the valve core assembly cuts off the communication between the main medium inlet and the second medium inlet, as well as the communication between the main medium outlet and the second medium outlet.

[0012] A drive unit for driving the valve core assembly to switch between a first position and a second position.

[0013] Preferably, in the above-mentioned linkage switching valve, the first medium inlet is connected to the total medium inlet through a first medium inlet channel, and the second medium inlet is connected to the total medium inlet through a second medium inlet channel;

[0014] The first medium outlet is connected to the total medium outlet via a first medium outlet channel; the second medium outlet is connected to the total medium outlet via a second medium outlet channel.

[0015] When the valve core assembly is in the first position, the valve core assembly cuts off the first medium inlet channel and the first medium outlet channel;

[0016] When the valve core assembly is in the second position, the valve core assembly cuts off the second medium inlet channel and the second medium outlet channel.

[0017] Preferably, in the above-mentioned linkage switching valve, the valve core assembly includes:

[0018] The first valve core has a second medium inlet blocking element and a first medium outlet blocking element;

[0019] The second valve core has a second medium outlet blocking element and a first medium inlet blocking element;

[0020] When the valve core assembly is in the first position, the second medium inlet blocking member disengages from the second medium inlet channel, the first medium outlet blocking member blocks the first medium outlet channel, the second medium outlet blocking member disengages from the second medium outlet channel, and the first medium inlet blocking member blocks the first medium inlet channel.

[0021] When the valve core assembly is in the second position, the second medium inlet blocking member blocks the second medium inlet channel, the first medium outlet blocking member disengages from the first medium outlet channel, the second medium outlet blocking member blocks the second medium outlet channel, and the first medium inlet blocking member disengages from the first medium inlet channel.

[0022] Preferably, in the above-mentioned linkage switching valve, the first valve core includes a first valve core body and a second medium inlet blocking member and a first medium outlet blocking member respectively disposed at both ends of the first valve core body;

[0023] The second valve core includes a second valve core body and a second medium outlet blocking member and a first medium inlet blocking member respectively disposed at both ends of the second valve core body.

[0024] Preferably, in the above-mentioned linkage switching valve, a first valve core sealing plate is formed on one side of the first valve core body portion, which is in a sealing sliding fit with the inner wall of the valve body, and a second valve core sealing plate is formed on one side of the second valve core body portion, which is in a sealing sliding fit with the inner wall of the valve body.

[0025] A sealing cavity is formed between the first valve core sealing plate and the second valve core sealing plate, and at least one of the first valve core and the second valve core has an air inlet channel communicating with the sealing cavity.

[0026] The driving device includes:

[0027] An air inlet, disposed on the valve body, is used to inflate the air channel. When inflating the sealed cavity, the valve core assembly is in the second position.

[0028] A reset element disposed on the valve body for driving the valve core assembly to slide to the first position.

[0029] Preferably, in the above-mentioned linkage switching valve, the inflation channel is disposed on the second valve core and communicates with the inner hole of the first medium inlet blocking member. The end of the first medium inlet blocking member is provided with an inflation connecting pipe that communicates with the inflation nozzle. When the inflation connecting pipe overlaps with the first medium inlet channel, there is a channel for the first medium to flow between the inflation connecting pipe and the first medium inlet channel.

[0030] When the valve core assembly is in the first position and the second position, the inflation connecting pipe is sealed and connected to the inflation nozzle.

[0031] Preferably, in the above-mentioned linkage switching valve, the reset element is disposed at the total medium inlet and the total medium outlet;

[0032] The reset member, which is located at the main inlet of the medium, has one end positioned with the shoulder of the main inlet of the medium and the other end abutting against the first valve core;

[0033] The reset member, which is located at the main outlet of the medium, has one end positioned with the shoulder of the main outlet of the medium and the other end abutting against the second valve core.

[0034] Preferably, in the above-mentioned linkage switching valve, the valve body has the following openings:

[0035] A first medium inlet blocking hole is used for sealing and cooperating with the first medium inlet blocking element, and the first medium inlet blocking hole is cross-connected with the first medium inlet channel;

[0036] A second medium inlet blocking hole is used for sealing and cooperating with the second medium inlet blocking element, and the second medium inlet blocking hole is cross-connected with the second medium inlet channel;

[0037] A second medium outlet blocking hole is used for sealing and fitting with the second medium outlet blocking element, and the second medium outlet blocking hole is cross-connected with the second medium outlet channel;

[0038] A first medium outlet blocking hole is used for sealing and cooperating with the first medium outlet blocking element, and the first medium outlet blocking hole is cross-connected with the first medium outlet channel.

[0039] Preferably, the above-mentioned linkage switching valve further includes a linkage gear, and both the first valve core and the second valve core are provided with gear teeth that mesh with the linkage gear.

[0040] Preferably, in the above-mentioned linkage switching valve, the valve body includes:

[0041] The first valve cover, wherein the total medium inlet, the first medium inlet and the second medium inlet are all disposed on the first valve cover;

[0042] The second valve cover, the total medium outlet, the first medium outlet and the second medium outlet are all provided on the second valve cover;

[0043] The valve body has one end connected to the first valve cover and the other end connected to the second valve cover, forming a valve cavity with the first valve cover and the second valve cover for housing the valve core assembly.

[0044] The linkage switching valve provided by this invention can switch the connection relationship between the two media and the linkage switching valve by switching the valve core assembly in the first and second positions. When applied to the switching of light and heavy oil in marine engines, it can simultaneously realize the switching of the oil inlet and return paths of light and heavy oil, eliminating the need for a valve connection and avoiding malfunctions such as insufficient fuel supply and engine shutdown due to missed operation. Furthermore, since only one valve needs to be operated to realize the simultaneous switching of the oil inlet and return paths of light and heavy oil, the labor intensity of the operator is reduced.

[0045] A light and heavy fuel oil switching system includes a linkage switching valve as described in any of the preceding claims, wherein the main medium inlet is used to connect to the fuel inlet pipeline, the first medium inlet is used to connect to the fuel outlet of the heavy fuel tank, and the second medium inlet is used to connect to the fuel outlet of the light fuel tank.

[0046] The main medium outlet is used to connect with the fuel return pipeline, the first medium outlet is used to connect with the fuel return port of the heavy fuel tank, and the second medium outlet is used to connect with the fuel return port of the light fuel tank.

[0047] A light and heavy fuel oil switching system includes a linkage switching valve as described in any of the above claims, and an air intake pipe connected to the air inlet. The main medium inlet is used to connect to the fuel inlet pipe, the first medium inlet is used to connect to the fuel outlet of the heavy fuel tank, and the second medium inlet is used to connect to the fuel outlet of the light fuel tank.

[0048] The main medium outlet is used to connect with the fuel return pipeline, the first medium outlet is used to connect with the fuel return port of the heavy fuel tank, and the second medium outlet is used to connect with the fuel return port of the light fuel tank.

[0049] Preferably, in the above-mentioned light and heavy oil switching system, an electromagnetic switching valve is provided between the air intake pipe and the air filling nozzle. When the electromagnetic switching valve is energized, the air intake pipe and the air filling nozzle are in a connected state. When the electromagnetic switching valve is de-energized, the air intake pipe and the air filling nozzle are in a cut-off state, and the air filling nozzle is in a connected state with the atmosphere.

[0050] Preferably, in the above-mentioned light and heavy oil switching system, the electromagnetic switching valve is a two-position three-way valve with a first air port, a second air port and a third air port, wherein the first air port is connected to the air inlet pipe and the second air port is connected to the air filling nozzle;

[0051] When the electromagnetic switching valve is energized, the first and second air ports are in a connected state, and the third air port is in a cut-off state from the atmosphere.

[0052] When the electromagnetic switching valve is de-energized, the first and second air ports are in a closed state, and the third air port is in a connected state with the second air port and the atmosphere, respectively.

[0053] Preferably, in the above-mentioned light and heavy oil switching system, at least one of a dehydrator, a filter, a pressure reducing valve, and a shut-off valve is connected in series on the air intake pipe.

[0054] The light and heavy oil switching system provided by this invention has all the technical effects of the aforementioned linkage switching valve because it has the above-mentioned linkage switching valve, which will not be repeated here. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 A cross-sectional view of the linkage switching valve in the first position provided in a specific embodiment of the present invention;

[0057] Figure 2 A cross-sectional view of the linkage switching valve in the second position, provided for a specific embodiment of the present invention;

[0058] Figure 3 A cross-sectional view of a valve core assembly provided in a specific embodiment of the present invention;

[0059] Figure 4 This is a cross-sectional view of the valve body in a specific embodiment of the present invention;

[0060] Figure 5 This is a schematic diagram of the structure of the light and heavy oil switching system during ventilation, provided in a specific embodiment of the present invention;

[0061] Figure 6 This is a schematic diagram of the structure of the light and heavy oil switching system when it is not ventilated, as provided in a specific embodiment of the present invention.

[0062] Figures 1 to 6 The meanings of the various reference numerals in the attached figures are as follows:

[0063] 1 is the linkage switching valve, 2 is the solenoid switching valve, 3 is the solenoid valve control box, 4 is the shut-off valve, 5 is the dehydrator, 6 is the filter, 7 is the pressure reducing valve, and 8 is the pressure gauge.

[0064] 100 is the first valve cover; 101 is the main medium inlet; 102 is the second medium inlet; 1021 is the second medium inlet channel; 1022 is the second medium inlet blocking hole; 103 is the first medium inlet; 1031 is the first medium inlet channel; 1032 is the first medium inlet blocking hole; 104 is the air inlet; 200 is the second valve cover; 201 is the main medium outlet; 202 is the first medium outlet; 2021 is the first medium outlet channel; 2022 is the first medium outlet blocking hole; 203 is the second medium outlet; 2031 is the second medium outlet. The outlet channel is as follows: 2032 is the second medium outlet blocking hole; 300 is the valve body; 400 is the first valve core; 401 is the first valve core body; 402 is the first valve core sealing plate; 403 is the second medium inlet blocking component; 404 is the first medium outlet blocking component; 500 is the second valve core; 501 is the second valve core body; 502 is the second valve core sealing plate; 503 is the second medium outlet blocking component; 504 is the first medium inlet blocking component; 505 is the air filling channel; 506 is the air filling connecting pipe; 600 is the linkage gear; and 700 is the reset component. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] like Figure 1 and Figure 2 The present invention discloses a linkage switching valve for switching between two media (a first medium and a second medium). It should be noted that these two media can be media with different compositions, or media with the same composition but from different containers; the linkage switching valve is not limited to switching between only two different media.

[0067] The linkage switching valve includes a valve body, a valve core assembly, and a drive device. The valve body has interconnected media inlet 101, a first media inlet 103, and a second media inlet 102. The media inlet 101, the first media inlet 103, and the second media inlet 102 are objectively connected; that is, both the first media inlet 103 and the second media inlet 102 are connected to the media inlet 101. The connection between one of the media inlets (one of the first media inlet 103 and the second media inlet 102) and the media inlet 101 can be severed, leaving only the other media inlet (the other of the first media inlet 103 and the second media inlet 102) connected to the media inlet 101. For example, if the connection between the first media inlet 103 and the media inlet 101 is severed, only media entering through the second media inlet 102 can flow out through the media inlet 101; conversely, only media entering through the first media inlet 103 can flow out through the media inlet 101.

[0068] The valve body also has interconnected media outlets 201, 202, and 203. These outlets are objectively connected, meaning both are connected to the main outlet 201. The connection between one outlet (either 202 or 203) and the main outlet 201 can be severed, leaving only the other outlet connected. For example, severing the connection between the first outlet 202 and the main outlet 201 means that media entering through the main outlet 201 can only exit through the second outlet 203, and vice versa.

[0069] It should be noted that when the linkage switching valve disclosed in this embodiment is applied to the switching of light and heavy oil, the medium flows in through the first medium inlet 103 and the second medium inlet 102, flows out through the total medium inlet 101, flows in through the total medium outlet 201, and flows out through the first medium outlet 202 and the second medium outlet 203. However, when used in other scenarios, the flow direction of the medium is not limited to the above method. The specific flow direction can be set according to the actual scenario. For example, it can flow in through the total medium inlet 101 and flow out through the first medium inlet 103 and the second medium inlet 102; or it can flow in through the first medium outlet 202 and the second medium outlet 203 and flow out through the total medium outlet 201.

[0070] For ease of understanding, the following description will use the medium entering the linkage switching valve from the first medium inlet 103 and the medium flowing out of the linkage switching valve from the first medium outlet 202 as the first medium, and the medium entering the linkage switching valve from the second medium inlet 102 and the medium flowing out of the linkage switching valve from the second medium outlet 203 as the second medium.

[0071] like Figure 1 As shown, the valve core assembly is slidably disposed within the valve body. When the valve core assembly is in the first position, the linkage switching valve switches to the second medium mode, and the valve core assembly cuts off the connection between the total medium inlet 101 and the first medium inlet 103, as well as the connection between the total medium outlet 201 and the first medium outlet 202. That is, when the valve core assembly slides to the first position within the valve body, the second medium enters the linkage switching valve through the second medium inlet 102 and flows out through the total medium inlet 101 to the target position. Correspondingly, the returning second medium enters the linkage switching valve through the total medium outlet 201 and flows out of the linkage switching valve through the second medium outlet 203.

[0072] For ease of understanding, let's take the application of a linkage switching valve to the switching between light and heavy oil in a marine engine as an example. The first medium is heavy oil, and the second medium is light oil. When the valve core assembly slides to the first position within the valve body, the linkage switching valve switches to light oil mode. Light oil from the light oil tank enters the linkage switching valve through the second medium inlet 102 and flows out to the marine engine through the main medium inlet 101. Correspondingly, light oil returning from the marine engine enters the linkage switching valve through the main medium outlet 201 and flows out of the linkage switching valve through the second medium outlet 203 back to the light oil tank. The inlet and outlet paths for heavy oil are blocked.

[0073] like Figure 2 As shown, when the valve core assembly is in the second position, the interlocking switching valve switches to the first medium mode. The valve core assembly cuts off the connection between the total medium inlet 101 and the second medium inlet 102, as well as the connection between the total medium outlet 201 and the second medium outlet 203. That is, when the valve core assembly slides to the second position in the valve body, the first medium enters the interlocking switching valve through the first medium inlet 103 and flows out through the total medium inlet 101 to the target position. Correspondingly, the returning first medium enters the interlocking switching valve through the total medium outlet 201 and flows out of the interlocking switching valve through the first medium outlet 202.

[0074] For ease of understanding, let's take the application of a linkage switching valve to the switching between light and heavy oil in a marine engine as an example. The first medium is heavy oil, and the second medium is light oil. When the valve core assembly slides to the second position within the valve body, the linkage switching valve switches to heavy oil mode. Heavy oil from the heavy oil tank enters the linkage switching valve through the first medium inlet 103 and flows out to the marine engine through the main medium inlet 101. Correspondingly, heavy oil returning from the marine engine enters the linkage switching valve through the main medium outlet 201 and flows out of the linkage switching valve through the first medium outlet 202 back to the heavy oil tank. The inlet and outlet pathways for light oil are blocked.

[0075] The drive device is used to drive the valve core assembly to switch between the first position and the second position. In valve components, there are many ways to drive the valve core assembly. This embodiment does not limit the specific structure and principle of the drive device. As long as it can drive the valve core assembly to switch between the first position and the second position, it is acceptable. The specific structure of the drive device will be described in detail later with examples.

[0076] The linkage switching valve disclosed in this invention can switch the connection relationship between two media and the linkage switching valve by switching the valve core assembly in the first and second positions. When applied to the switching of light and heavy oil in marine engines, it can simultaneously realize the switching of the oil inlet and return paths of light and heavy oil, eliminating the need for a valve connection and avoiding failures such as insufficient fuel supply and engine shutdown due to missed operation. Furthermore, since only one valve needs to be operated to realize the simultaneous switching of the oil inlet and return paths of light and heavy oil, the labor intensity of the operator is reduced.

[0077] Traditional valve components also have connecting holes on their valve core assemblies. By moving or rotating the valve core assembly, these connecting holes are aligned with certain holes on the valve body, ensuring that some holes on the valve body are in a connected state. This requires high precision from the valve component, necessitating strict alignment to guarantee maximum flow. However, the linkage switching valve disclosed in this invention has all ports in a connected state. When needed, the connection of certain ports is cut off by the valve core assembly. Cutting off the passage requires less precision; only proper sealing is necessary.

[0078] like Figure 4 As shown, the first medium inlet 103 is connected to the total medium inlet 101 through the first medium inlet channel 1031, and the second medium inlet 102 is connected to the total medium inlet 101 through the second medium inlet channel 1021. The first medium outlet 202 is connected to the total medium outlet 201 through the first medium outlet channel 2021; the second medium outlet 203 is connected to the total medium outlet 201 through the second medium outlet channel 2031.

[0079] like Figure 1As shown, when the valve core assembly is in the first position, it cuts off the first medium inlet channel 1031 and the first medium outlet channel 2021. By cutting off the first medium inlet channel 1031, the valve core assembly cuts off the connection between the total medium inlet 101 and the first medium inlet 103; by cutting off the first medium outlet channel 2021, it cuts off the connection between the total medium outlet 201 and the first medium outlet 202. Because the first medium inlet channel 1031 and the first medium outlet channel 2021 are relatively long, the valve core assembly can achieve sealing at any position to cut off the passage of medium, which is easier to implement and has lower precision requirements.

[0080] like Figure 2 As shown, when the valve core assembly is in the second position, it cuts off the second medium inlet channel 1021 and the second medium outlet channel 2031. By cutting off the second medium inlet channel 1021, the valve core assembly cuts off the connection between the total medium inlet 101 and the second medium inlet 102; by cutting off the second medium outlet channel 2031, it cuts off the connection between the total medium outlet 201 and the second medium outlet 203. Because the second medium inlet channel 1021 and the second medium outlet channel 2031 are relatively long, the valve core assembly can achieve sealing at any position to cut off the passage of medium, which is easier to implement and has lower precision requirements.

[0081] like Figure 3 As shown, a specific embodiment of the present invention discloses the specific structure of the valve core, which includes a first valve core 400 and a second valve core 500.

[0082] The first valve core 400 includes a second medium inlet blocking member 403 and a first medium outlet blocking member 404. When the first valve core 400 moves toward the second medium inlet blocking member 403, the second medium inlet blocking member 403 inserts into the second medium inlet channel 1021 and blocks the second medium inlet channel 1021, while the first medium outlet blocking member 404 disengages from the first medium outlet channel 2021, keeping the first medium outlet channel 2021 in a connected state. When the first valve core 400 moves toward the first medium outlet blocking member 404, the second medium inlet blocking member 403 disengages from the second medium inlet channel 1021, keeping the second medium inlet channel 1021 in a connected state, while the first medium outlet blocking member 404 inserts into the first medium outlet channel 2021 and cuts off the first medium outlet channel 2021.

[0083] The second valve core 500 has a second medium outlet blocking member 503 and a first medium inlet blocking member 504. When the second valve core 500 moves toward the second medium outlet blocking member 503, the second medium outlet blocking member 503 inserts into the second medium outlet channel 2031 and blocks the second medium outlet channel 2031, while the first medium inlet blocking member 504 disengages from the first medium inlet channel 1031, so that the first medium inlet channel 1031 remains connected; when the second valve core 500 moves toward the first medium inlet blocking member 504, the second medium outlet blocking member 503 disengages from the second medium outlet channel 2031, so that the second medium outlet channel 2031 remains connected, while the first medium inlet blocking member 504 inserts into the first medium inlet channel 1031 and blocks the first medium inlet channel 1031.

[0084] like Figure 1 , Figure 3 and Figure 4 As shown, when the valve core assembly is in the first position, the second medium inlet blocking member 403 disengages from the second medium inlet channel 1021, the first medium outlet blocking member 404 blocks the first medium outlet channel 2021, the second medium outlet blocking member 503 disengages from the second medium outlet channel 2031, and the first medium inlet blocking member 504 blocks the first medium inlet channel 1031. That is, when the valve core assembly is in the first position, the first valve core 400 moves towards the first medium outlet blocking member 404, and the second valve core 500 moves towards the first medium inlet blocking member 504. Preferably, the first valve core 400 and the second valve core 500 move in opposite directions within the valve body, that is, when the valve core assembly is in the first position, the first valve core 400 and the second valve core 500 move closer to each other.

[0085] like Figure 2 , Figure 3 and Figure 4 As shown, when the valve core assembly is in the second position, the second medium inlet blocking member 403 blocks the second medium inlet channel 1021, the first medium outlet blocking member 404 disengages from the first medium outlet channel 2021, the second medium outlet blocking member 503 blocks the second medium outlet channel 2031, and the first medium inlet blocking member 504 disengages from the first medium inlet channel 1031. That is, when the valve core assembly is in the second position, the first valve core 400 moves towards the second medium inlet blocking member 403, and the second valve core 500 moves towards the second medium outlet blocking member 503. Preferably, the first valve core 400 and the second valve core 500 move in opposite directions within the valve body, that is, when the valve core assembly is in the second position, the first valve core 400 and the second valve core 500 move away from each other.

[0086] like Figure 3As shown, in this embodiment, the first valve core 400 may include a first valve core body 401 and a second medium inlet blocking member 403 and a first medium outlet blocking member 404 respectively disposed at both ends of the first valve core body 401. The second medium inlet blocking member 403 and the first medium outlet blocking member 404 are respectively disposed at both ends of the first valve core body 401, while the second medium inlet channel 1021 and the first medium outlet channel 2021 are disposed at both ends of the valve body. This ensures that when the first valve core 400 moves towards the second medium inlet blocking member 403, the second medium inlet blocking member 403 gradually moves closer to the second medium inlet channel 1021, while the first medium outlet blocking member 404 gradually moves away from the first medium outlet channel 2021. When the second medium inlet blocking member 403 inserts into the second medium inlet channel 1021, the first medium outlet blocking member 404 just disengages from the first medium outlet channel 2021, and vice versa, making switching linkage easier to achieve.

[0087] Correspondingly, the second valve core 500 may include a second valve core body 501 and a second medium outlet blocking member 503 and a first medium inlet blocking member 504 respectively disposed at both ends of the second valve core body 501. By disposing the second medium outlet blocking member 503 and the first medium inlet blocking member 504 at both ends of the second valve core body 501, and the second medium outlet channel 2031 and the first medium inlet channel 1031 at both ends of the valve body, when the second valve core 500 moves toward the second medium outlet blocking member 503, the second medium outlet blocking member 503 gradually moves toward the second medium outlet channel 2031, while the first medium inlet blocking member 504 gradually moves away from the first medium inlet channel 1031. When the second medium outlet blocking member 503 inserts into the second medium outlet channel 2031, the first medium inlet blocking member 504 just disengages from the first medium inlet channel 1031, and vice versa, making switching linkage easier to achieve.

[0088] like Figure 3As shown, in a specific embodiment of the present invention, a first valve core sealing plate 402 is formed on one side of the first valve core body 401 to slide and seal with the inner wall of the valve body, and a second valve core sealing plate 502 is formed on one side of the second valve core body 501 to slide and seal with the inner wall of the valve body. If one of the second medium outlet blocking member 503 and the first medium inlet blocking member 504 intersects with the first valve core sealing plate 402, a hole needs to be opened in the first valve core sealing plate 402 for it to pass through. For example, a sliding hole is opened on the first valve core sealing plate 402 to slide and seal with the first medium inlet blocking member 504. Correspondingly, if one of the second medium inlet blocking member 403 and the first medium outlet blocking member 404 intersects with the second valve core sealing plate 502, a hole needs to be opened in the second valve core sealing plate 502 for it to pass through. For example, a sliding hole is opened on the second valve core sealing plate 502 to slide and seal with the first medium outlet blocking member 404.

[0089] A sealing cavity is formed between the first valve core sealing plate 402 and the second valve core sealing plate 502. At least one of the first valve core 400 and the second valve core 500 has an inflation channel 505 that communicates with the sealing cavity. Compressed air can be injected into the sealing cavity through the inflation channel 505 to increase the pressure of the sealing cavity.

[0090] Given the specific structure of the valve core assembly described above, the driving device in this embodiment may include an air inlet 104 and a reset member 700. The air inlet 104 is disposed on the valve body and is used to inflate the air inlet channel 505. It is connected to an external compressed air device. When switching is required, compressed air is injected into the sealing cavity through the air inlet 104 and the air inlet channel 505. As the pressure in the sealing cavity increases, it pushes the first valve core 400 and the second valve core 500 to move away from each other, so that the valve core assembly is in the second position.

[0091] The reset member 700 is disposed on the valve body and is used to drive the valve core assembly to slide to the first position. The reset member 700 is an elastic member. After the air is stopped being filled into the sealing cavity, the pressure in the sealing cavity disappears. Under the action of the elastic force of the reset member 700, the first valve core 400 and the second valve core 500 move towards each other, so that the valve core assembly is in the first position.

[0092] It should be noted that the drive device can also be of other forms, such as an electromagnetic component. When energized, the electromagnetic force drives the first valve core 400 and the second valve core 500 to move away from each other, placing the valve core assembly in a second position. When de-energized, under the action of a reset component, they move towards each other, placing the valve core assembly in the first position. This also allows the drive device to switch between the first and second positions. The drive device can also use an external device to drive the valve core assembly, for example, by using gears that mesh with the first valve core 400 and the second valve core 500 respectively. By rotating these gears, the first valve core 400 and the second valve core 500 are driven to move closer or further apart. These gears can be driven by a motor or by an external drive shaft for manual operation.

[0093] To ensure communication with the inflation nozzle 104 when the valve core assembly is in both the first and second positions, the compressed air injected into the inflation nozzle 104 can only enter the inflation channel 505 and not the medium flow channel. To achieve this technical effect, in a specific embodiment of the present invention, the inflation channel 505 is disposed on the second valve core 500 and communicates with the inner hole of the first medium inlet blocking member 504. The end of the first medium inlet blocking member 504 is provided with an inflation connecting pipe 506 communicating with the inflation nozzle 104. When the inflation connecting pipe 506 overlaps with the first medium inlet channel 1031, a channel for the first medium to flow is formed between the inflation connecting pipe 506 and the first medium inlet channel 1031. Taking the first medium inlet blocking component 504 and the air-filling connecting pipe 506 as examples, both being round pipes, the outer diameter of the air-filling connecting pipe 506 must be smaller than the outer diameter of the first medium inlet blocking component 504. This ensures that the first medium inlet channel 1031 will not be cut off after the air-filling connecting pipe 506 moves to the position of the first medium inlet channel 1031. The first medium inlet channel 1031 will only be cut off after the first medium inlet blocking component 504 moves to the position of the first medium inlet channel 1031.

[0094] When the valve core assembly is in the first and second positions, the inflation connecting pipe 506 is in sealed connection with the inflation nozzle 104. For example... Figure 1 and Figure 2 As shown in the angle, when the valve core assembly is in the first position and the second position, the upper edge of the air charging connecting pipe 506 is always above the first medium inlet channel 1031. That is, the opening of the air charging connecting pipe 506 is always sealed with the valve body and will not move to connect with the first medium inlet channel 1031. Therefore, as long as the air charging connecting pipe 506 is properly sealed with the valve body, it can be ensured that the compressed air charged by the air charging nozzle 104 can only enter the air charging channel 505 and will not enter the first medium inlet channel 1031.

[0095] To facilitate the installation of the reset component 700, in this embodiment, the reset component 700 is set at the medium inlet 101 and the medium outlet 201. The diameters of the medium inlet 101 and the medium outlet 201 are relatively large, which is suitable for installing the reset component 700 and can reduce the space occupied in the valve cavity.

[0096] The reset member 700, located at the main medium inlet 101, has one end positioned with the shoulder of the main medium inlet 101 and the other end abutting against the first valve core 400. That is, a part of the reset member 700 is embedded in the main medium inlet 101, and a part extends out of the main medium inlet 101 and abuts against the first valve core 400. This means that the reset member 700 does not need to be fixed by any additional means and can be fixed by the main medium inlet 101.

[0097] The reset member 700, located at the main medium outlet 201, has one end positioned with the shoulder of the main medium outlet 201 and the other end abutting against the second valve core 500. That is, a portion of the reset member 700 is embedded within the main medium outlet 201, while a portion extends outward from the main medium outlet 201 and abuts against the second valve core 500. This eliminates the need for additional fixing of the reset member 700, allowing it to be secured using the main medium outlet 201.

[0098] To facilitate the blocking of the first medium inlet channel 1031, the second medium inlet channel 1021, the second medium outlet channel 2031 and the first medium outlet channel 2021, the valve body is provided with a first medium inlet blocking hole 1032, a second medium inlet blocking hole 1022, a second medium outlet blocking hole 2032 and a first medium outlet blocking hole 2022.

[0099] The first medium inlet blocking hole 1032 is used to seal with the first medium inlet blocking member 504. The first medium inlet blocking hole 1032 is cross-connected with the first medium inlet channel 1031 (that is, the first medium inlet channel 1031 is passed through by the first medium inlet blocking hole 1032). After the first medium inlet blocking member 504 moves into the first medium inlet blocking hole 1032, the first medium inlet channel 1031 is cut off by the sealing relationship between the first medium inlet blocking member 504 and the first medium inlet blocking hole 1032.

[0100] The second medium inlet blocking hole 1022 is used to seal with the second medium inlet blocking component 403. The second medium inlet blocking hole 1022 is cross-connected with the second medium inlet channel 1021 (that is, the second medium inlet channel 1021 is passed through by the second medium inlet blocking hole 1022). After the second medium inlet blocking component 403 moves into the second medium inlet blocking hole 1022, the second medium inlet channel 1021 is cut off by the sealing relationship between the second medium inlet blocking component 403 and the second medium inlet blocking hole 1022.

[0101] The second medium outlet blocking hole 2032 is used to seal with the second medium outlet blocking member 503. The second medium outlet blocking hole 2032 is cross-connected with the second medium outlet channel 2031 (that is, the second medium outlet channel 2031 is passed through by the second medium outlet blocking hole 2032). After the second medium outlet blocking member 503 moves into the second medium outlet blocking hole 2032, the second medium outlet channel 2031 is cut off by the sealing relationship between the second medium outlet blocking member 503 and the second medium outlet blocking hole 2032.

[0102] The first medium outlet blocking hole 2022 is used to seal with the first medium outlet blocking member 404. The first medium outlet blocking hole 2022 is cross-connected with the first medium outlet channel 2021 (that is, the first medium outlet channel 2021 is passed through by the first medium outlet blocking hole 2022). After the first medium outlet blocking member 404 moves into the first medium outlet blocking hole 2022, the first medium outlet channel 2021 is cut off by the sealing relationship between the first medium outlet blocking member 404 and the first medium outlet blocking hole 2022.

[0103] To achieve the linkage between the first valve core 400 and the second valve core 500, the linkage switching valve disclosed in this embodiment also includes a linkage gear 600. Both the first valve core 400 and the second valve core 500 are provided with gear teeth that mesh with the linkage gear 600. By adding the linkage gear 600, this embodiment allows the drive device to move only one of the first valve core 400 and the second valve core 500; the other valve core 400 and the other valve core 500 will move synchronously under the action of the linkage gear 600.

[0104] It should be noted that since the first valve core 400 and the second valve core 500 do not require a large movement distance when switching between the first and second positions, the linkage gear 600 does not need to have teeth on its entire circumference; it can have only a portion of the teeth. The teeth on the first valve core 400 and the second valve core 500 can be provided on the first valve core body 401 and the second valve core body 501.

[0105] In a specific embodiment of the present invention, the valve body may include a first valve cover 100, a second valve cover 200, and a valve body 300. The main medium inlet 101, the first medium inlet 103, and the second medium inlet 102 are all disposed on the first valve cover 100, and the main medium outlet 201, the first medium outlet 202, and the second medium outlet 203 are all disposed on the second valve cover 200. One end of the valve body 300 is connected to the first valve cover 100, and the other end is connected to the second valve cover 200, forming a valve cavity for housing the valve core assembly together with the first valve cover 100 and the second valve cover 200.

[0106] like Figure 5 and Figure 6 As shown in the figure, this embodiment of the invention discloses a light and heavy fuel oil switching system, including the linkage switching valve 1 disclosed in the above embodiment. A main medium inlet 101 is connected to the fuel inlet pipeline, a first medium inlet 103 is connected to the heavy fuel tank fuel outlet, and a second medium inlet 102 is connected to the light fuel tank fuel outlet. A main medium outlet 201 is connected to the fuel outlet return pipeline, a first medium outlet 202 is connected to the heavy fuel tank fuel return port, and a second medium outlet 203 is connected to the light fuel tank fuel return port.

[0107] like Figure 5 As shown, when the valve core assembly of the linkage switching valve 1 slides to the first position within the valve body, light oil from the light oil tank enters the linkage switching valve 1 through the light oil tank fuel outlet via the second medium inlet 102, flows out through the main medium inlet 101, and enters the marine engine through the fuel inlet pipeline. Correspondingly, light oil returning from the marine engine enters the linkage switching valve 1 through the fuel outlet return pipeline via the main medium outlet 201, flows out of the linkage switching valve 1 through the second medium outlet 203, and enters the light oil tank through the light oil tank fuel return port. The inlet and return paths of heavy oil are cut off.

[0108] like Figure 6 As shown, when the valve core assembly of the linkage switching valve 1 slides to the second position within the valve body, heavy oil from the heavy oil tank enters the linkage switching valve 1 through the heavy oil tank fuel outlet via the first medium inlet 103, flows out through the total medium inlet 101, and enters the marine engine through the fuel inlet pipeline. Correspondingly, heavy oil returning from the marine engine enters the linkage switching valve 1 through the fuel outlet return pipeline via the total medium outlet 201, flows out of the linkage switching valve 1 through the first medium outlet 202, and enters the heavy oil tank through the heavy oil tank fuel return port. The inlet and return paths of light oil are cut off.

[0109] Given the implementation of the linkage switching valve 1 with an air inlet 104, the light and heavy oil switching system disclosed in this embodiment also includes an air inlet pipe, which is connected to the air inlet 104 and is used to inflate the air inlet channel 505 through the air inlet 104, so as to realize the switching of the valve core assembly of the linkage switching valve 1 between the first position and the second position.

[0110] The main medium inlet 101 is connected to the fuel inlet pipeline, the first medium inlet 103 is connected to the fuel outlet of the heavy fuel tank, and the second medium inlet 102 is connected to the fuel outlet of the light fuel tank. The main medium outlet 201 is connected to the fuel return pipeline, the first medium outlet 202 is connected to the fuel return port of the heavy fuel tank, and the second medium outlet 203 is connected to the fuel return port of the light fuel tank. The specific flow direction of the light and heavy fuels depending on the position of the valve core assembly can be referred to the above embodiment, which will not be repeated here. This embodiment uses pneumatic control to drive the valve core assembly, which can directly utilize the existing compressed air control and conversion system on board without the need for an additional air source.

[0111] In a specific embodiment of the present invention, an electromagnetic switching valve 2 (which can be controlled by an electromagnetic valve control box 3 in the ship's bridge) is provided between the air intake pipe and the air filling nozzle 104. When the electromagnetic switching valve 2 is energized, the air intake pipe and the air filling nozzle 104 are in a connected state; when the electromagnetic switching valve 2 is de-energized, the air intake pipe and the air filling nozzle 104 are in a closed state, and the air filling nozzle 104 is in a connected state with the atmosphere. This embodiment uses the electromagnetic switching valve 2 to control the air passage, which can be controlled in the ship's bridge without the need for manual operation in the engine room, saving time and effort and avoiding misoperation. Moreover, in the event of a power failure on board, the electromagnetic switching valve 2 is de-energized, which can automatically switch to light fuel mode, avoiding the problem of engine shutdown caused by fuel line blockage due to low temperature and high viscosity of heavy fuel, resulting in the inability of the fuel injector to atomize.

[0112] The electromagnetic switching valve 2 is a two-position three-way valve with a first air port, a second air port, and a third air port. The first air port is connected to the air inlet pipe, and the second air port is connected to the air filling nozzle 104. When the electromagnetic switching valve 2 is energized, the first and second air ports are connected, and the third air port is closed to the atmosphere. When the electromagnetic switching valve 2 is de-energized, the first and second air ports are closed, the second and third air ports are connected, and the third air port is open to the atmosphere, allowing the compressed air in the sealed cavity of the linkage switching valve 1 to be discharged through the third air port.

[0113] In one specific embodiment of the present invention, at least one of the following components—a dehydrator 5, a filter 6, a pressure reducing valve 7, and a shut-off valve 4—is connected in series on the air intake pipeline. High-pressure compressed air can be dehydrated by the dehydrator 5, filtered by the filter 6, and then reduced to approximately 6 bar by the pressure reducing valve before being supplied to the solenoid switching valve 2. The addition of the shut-off valve 4 allows for manual shut-off of the air supply in special circumstances. The air intake pipeline can also be equipped with a pressure gauge 8 for detecting the gas pressure after pressure reduction by the pressure reducing valve 7.

[0114] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0115] It should be understood that the use of terms such as "system," "device," "unit," and / or "module" in this application is merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0116] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0117] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0118] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0119] If a flowchart is used in this application, it is used to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0120] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A linkage switching valve, characterized in that, include: The valve body has a total medium inlet (101) and a total medium outlet (201), a first medium inlet (103) connected to the total medium inlet (101) through a first medium inlet channel (1031), a second medium inlet (102) connected to the total medium inlet (101) through a second medium inlet channel (1021), a first medium outlet (202) connected to the total medium outlet (201) through a first medium outlet channel (2021), and a second medium outlet (203) connected to the total medium outlet (201) through a second medium outlet channel (2031). A valve core assembly, slidably disposed in the valve body, includes a first valve core (400) and a second valve core (500). The first valve core (400) has a second medium inlet blocking element (403) and a first medium outlet blocking element (404); the second valve core (500) has a second medium outlet blocking element (503) and a first medium inlet blocking element (504). The linkage gear (600) is provided with gear teeth that mesh with the linkage gear (600) for both the first valve core (400) and the second valve core (500), so that the first valve core (400) and the second valve core (500) move in opposite directions; When the valve core assembly is in the first position, the second medium inlet blocking member (403) disengages from the second medium inlet channel (1021), the first medium outlet blocking member (404) blocks the first medium outlet channel (2021), the second medium outlet blocking member (503) disengages from the second medium outlet channel (2031), and the first medium inlet blocking member (504) blocks the first medium inlet channel (1031). When the valve core assembly is in the second position, the second medium inlet blocking member (403) blocks the second medium inlet channel (1021), the first medium outlet blocking member (404) disengages from the first medium outlet channel (2021), the second medium outlet blocking member (503) blocks the second medium outlet channel (2031), and the first medium inlet blocking member (504) disengages from the first medium inlet channel (1031). A drive device for driving the valve core assembly to switch between a first position and a second position.

2. The linkage switching valve according to claim 1, characterized in that, The first valve core (400) includes a first valve core body (401) and a second medium inlet blocking member (403) and a first medium outlet blocking member (404) respectively disposed at both ends of the first valve core body (401). The second valve core (500) includes a second valve core body (501) and a second medium outlet blocking member (503) and a first medium inlet blocking member (504) respectively disposed at both ends of the second valve core body (501).

3. The linkage switching valve according to claim 2, characterized in that, A first valve core sealing plate (402) is formed on one side of the first valve core body (401) and slides in a sealing fit with the inner wall of the valve body; a second valve core sealing plate (502) is formed on one side of the second valve core body (501) and slides in a sealing fit with the inner wall of the valve body. A sealing cavity is formed between the first valve core sealing plate (402) and the second valve core sealing plate (502), and at least one of the first valve core (400) and the second valve core (500) has an inflation channel (505) communicating with the sealing cavity. The driving device includes: An air inlet (104) disposed on the valve body for inflating the air inlet channel (505) is provided. When inflating the sealed cavity, the valve core assembly is in the second position. A reset element (700) disposed on the valve body for driving the valve core assembly to slide to the first position.

4. The linkage switching valve according to claim 3, characterized in that, The inflation channel (505) is disposed on the second valve core (500) and communicates with the inner hole of the first medium inlet blocking member (504). The end of the first medium inlet blocking member (504) is provided with an inflation connecting pipe (506) communicating with the inflation nozzle (104). When the inflation connecting pipe (506) overlaps with the first medium inlet channel (1031), there is a channel for the first medium to flow between the inflation connecting pipe (506) and the first medium inlet channel (1031). When the valve core assembly is in the first position and the second position, the inflation connecting pipe (506) is in sealed communication with the inflation nozzle (104).

5. The linkage switching valve according to claim 3, characterized in that, The reset component (700) is disposed at the medium total inlet (101) and the medium total outlet (201); The reset member (700) is located at the medium inlet (101), with one end positioned with the shoulder of the medium inlet (101) and the other end abutting against the first valve core (400); The reset member (700) is located at the medium outlet (201), with one end positioned on the shoulder of the medium outlet (201) and the other end abutting against the second valve core (500).

6. The linkage switching valve according to claim 1, characterized in that, The valve body has the following openings: A first medium inlet blocking hole (1032) is used for sealing cooperation with the first medium inlet blocking component (504), and the first medium inlet blocking hole (1032) is cross-connected with the first medium inlet channel (1031); A second medium inlet blocking hole (1022) is used for sealing cooperation with the second medium inlet blocking component (403), and the second medium inlet blocking hole (1022) is cross-connected with the second medium inlet channel (1021); A second medium outlet blocking hole (2032) is used for sealing and cooperating with the second medium outlet blocking component (503), and the second medium outlet blocking hole (2032) is cross-connected with the second medium outlet channel (2031); A first medium outlet blocking hole (2022) is used to seal with the first medium outlet blocking member (404), and the first medium outlet blocking hole (2022) is cross-connected with the first medium outlet channel (2021).

7. The linkage switching valve according to any one of claims 1-6, characterized in that, The valve body includes: The first valve cover (100) is provided with the main medium inlet (101), the first medium inlet (103) and the second medium inlet (102). The second valve cover (200) is provided with the total medium outlet (201), the first medium outlet (202) and the second medium outlet (203). The valve body (300) is connected at one end to the first valve cover (100) and at the other end to the second valve cover (200), and together with the first valve cover (100) and the second valve cover (200), forms a valve cavity for setting the valve core assembly.

8. A light / heavy oil switching system, characterized in that, Includes the linkage switching valve (1) as described in any one of claims 1-7, wherein the main medium inlet (101) is used to connect with the fuel inlet pipeline, the first medium inlet (103) is used to connect with the fuel outlet of the heavy fuel tank, and the second medium inlet (102) is used to connect with the fuel outlet of the light fuel tank; The medium outlet (201) is used to connect with the fuel outlet return line, the first medium outlet (202) is used to connect with the fuel return port of the heavy fuel tank, and the second medium outlet (203) is used to connect with the fuel return port of the light fuel tank.

9. A light-to-heavy oil switching system, characterized in that, Includes the linkage switching valve (1) as described in any one of claims 3-5, and an air intake pipe connected to the air inlet (104), wherein the medium main inlet (101) is used to connect to the fuel inlet pipe, the first medium inlet (103) is used to connect to the fuel outlet of the heavy fuel tank, and the second medium inlet (102) is used to connect to the fuel outlet of the light fuel tank. The medium outlet (201) is used to connect with the fuel outlet return line, the first medium outlet (202) is used to connect with the fuel return port of the heavy fuel tank, and the second medium outlet (203) is used to connect with the fuel return port of the light fuel tank.

10. The light / heavy oil switching system according to claim 9, characterized in that, An electromagnetic switching valve (2) is provided between the air intake pipe and the air filling nozzle (104). When the electromagnetic switching valve (2) is energized, the air intake pipe and the air filling nozzle (104) are in a connected state. When the electromagnetic switching valve (2) is de-energized, the air intake pipe and the air filling nozzle (104) are in a cut-off state, and the air filling nozzle (104) is in a connected state with the atmosphere.

11. The light / heavy oil switching system according to claim 10, characterized in that, The electromagnetic switching valve (2) is a two-position three-way valve with a first air port, a second air port and a third air port. The first air port is connected to the air inlet pipe and the second air port is connected to the air filling nozzle (104). When the electromagnetic switching valve (2) is energized, the first air port and the second air port are in a connected state, and the third air port is in a cut-off state from the atmosphere. When the electromagnetic switching valve (2) is de-energized, the first and second air ports are in a cut-off state, and the third air port is in a connected state with the second air port and the atmosphere, respectively.

12. The light / heavy oil switching system according to claim 9, characterized in that, At least one of the following is connected in series on the air intake pipe: a dehydrator (5), a filter (6), a pressure reducing valve (7), and a shut-off valve (4).

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