A crankcase ventilation pipe anti-icing device, crankcase and engine

Abstract

This application discloses a crankcase ventilation pipe anti-icing device, a crankcase, and an engine. The crankcase ventilation pipe anti-icing device includes a first heating jacket and a second heating jacket, which are arranged in parallel or series. One of the first and second heating jackets is fitted outside the intake pipe of the crankcase ventilation pipe, and the other is fitted outside the exhaust pipe of the crankcase ventilation pipe, forming a heating chamber outside the intake and exhaust pipes. Fuel combustion in the engine cylinder generates a large amount of heat, some of which is carried away by the engine coolant. The coolant, after absorbing heat, has a temperature close to 100°C, making it a high-quality heat source. This high-quality heat source is supplied to the heating chamber to heat the intake and exhaust pipes of the crankcase ventilation pipe, thereby preventing icing in the intake and exhaust pipes when the ambient temperature reaches zero degrees Celsius or lower, and reducing the risk of crankcase ventilation pipe blockage.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to an anti-icing device for crankcase ventilation pipes, a crankcase, and an engine. Background Technology

[0002] The crankcase collects leaked hydrogen from the internal combustion engine and works with the oil-gas separator to treat blow-by gases. The crankcase is connected to the engine's intake manifold via a crankcase ventilation pipe. Specifically, the crankcase ventilation pipe includes an intake pipe and an exhaust pipe. The intake pipe connects the crankcase to the oil-gas separator, and the exhaust pipe connects the oil-gas separator to the engine's intake manifold.

[0003] Blow-by gas from the crankcase enters the oil-gas separator through the intake manifold for oil-gas separation. The separated oil returns to the engine, while the separated exhaust gas enters the engine's intake manifold through the exhaust manifold, thus completing the operation of the closed crankcase ventilation system.

[0004] The fuel for hydrogen internal combustion engines is hydrogen. The combustion of hydrogen produces a lot of moisture, resulting in a high water content in the leaked gas. When the ambient temperature reaches zero degrees or lower, it is very easy for ice to form in the intake and exhaust pipes of the crankcase ventilation pipe, causing blockage of the crankcase ventilation pipe.

[0005] Therefore, how to solve the problem of icing in the intake and exhaust pipes of the crankcase ventilation pipe, in order to reduce the risk of blockage in the crankcase ventilation pipe, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] This application proposes a crankcase ventilation pipe anti-icing device to solve the problem of icing in the intake and exhaust pipes of the crankcase ventilation pipe, reducing the risk of crankcase ventilation pipe blockage. This application also proposes a crankcase with the above-mentioned crankcase ventilation pipe anti-icing device and an engine with the above-mentioned crankcase.

[0007] To achieve the above objectives, this application provides a crankcase ventilation pipe anti-icing device, including a first heating jacket and a second heating jacket;

[0008] The first heating jacket and the second heating jacket are connected in parallel. The inlets of the first heating jacket and the second heating jacket are connected to the engine's water outlet pipe, and the outlets of the first heating jacket and the second heating jacket are connected to the engine's water return pipe.

[0009] or,

[0010] The first heating jacket and the second heating jacket are connected in series. The inlet of the first heating jacket is connected to the water outlet pipe of the engine, the outlet of the first heating jacket is connected to the inlet of the second heating jacket, and the outlet of the second heating jacket is connected to the water return pipe.

[0011] One of the first heating sleeve and the second heating sleeve is fitted outside the intake pipe of the crankcase ventilation pipe, and the other of the first heating sleeve and the second heating sleeve is fitted outside the exhaust pipe of the crankcase ventilation pipe to form a heating cavity outside the intake pipe and the exhaust pipe. The heating cavity is connected to the inlet and the outlet.

[0012] Preferably, in the above-mentioned crankcase ventilation pipe anti-icing device, the flow direction of the cooling water from the engine in the heating chamber is opposite to the flow direction of the gas in the intake pipe and / or the exhaust pipe.

[0013] Preferably, in the above-mentioned crankcase ventilation pipe anti-icing device, the first heating sleeve and the second heating sleeve have circular cross-sections along the direction perpendicular to their own length.

[0014] The first heating jacket and the second heating jacket each have tapered tubes at both ends in the length extension direction, and the tapered tubes are connected to the air inlet pipe or the air outlet pipe.

[0015] Preferably, in the above-mentioned crankcase ventilation pipe anti-icing device, when the first heating jacket and the second heating jacket are connected in parallel, the first heating jacket and the second heating jacket are connected to the water outlet pipe through a main pipe and two branch pipes. The inlet of the main pipe is connected to the water outlet pipe, the outlet of the main pipe is connected to the inlet of the two branch pipes, and the outlet of the two branch pipes is connected to the first heating jacket and the second heating jacket respectively.

[0016] The main pipe is equipped with a first electrically controlled water valve and a check valve, and / or the branch pipe is equipped with a second electrically controlled water valve.

[0017] Preferably, in the above-mentioned crankcase ventilation pipe anti-icing device, the inlet of the first heating jacket is provided with a first temperature measuring device for monitoring the inlet water temperature, and the outlet of the first heating jacket is provided with a second temperature measuring device for monitoring the return water temperature.

[0018] And / or,

[0019] The first temperature measuring device is installed at the inlet of the second heating jacket, and the second temperature measuring device is installed at the outlet of the second heating jacket.

[0020] Preferably, in the above-mentioned crankcase ventilation pipe anti-icing device, the outlet of the first heating jacket and / or the second heating jacket is provided with a third electrically controlled water valve.

[0021] Secondly, a crankcase is disclosed, including a crankcase ventilation pipe and a crankcase ventilation pipe anti-icing device, wherein the crankcase ventilation pipe anti-icing device is the crankcase ventilation pipe anti-icing device described in any of the above embodiments.

[0022] Preferably, in the crankcase described above, the intake pipe and / or exhaust pipe of the crankcase ventilation pipe are corrugated pipes.

[0023] Thirdly, an engine is disclosed, including a crankcase, wherein the crankcase is the crankcase described in any of the above embodiments.

[0024] Preferably, in the engine described above, the outlet of the crankcase ventilation pipe anti-icing device is connected to the pipeline between the radiator and the engine circulating water pump.

[0025] The crankcase ventilation pipe anti-icing device provided in this application includes a first heating sleeve and a second heating sleeve, which are arranged in parallel or series. One of the first and second heating sleeves is fitted outside the intake pipe of the crankcase ventilation pipe, and the other is fitted outside the outlet pipe of the crankcase ventilation pipe, forming a heating chamber outside the intake and outlet pipes. Fuel combustion in the engine cylinder generates a large amount of heat, some of which is carried away by the engine coolant. The coolant, after absorbing heat, has a temperature close to 100°C, making it a high-quality heat source. This high-quality heat source is supplied to the heating chamber to heat the intake and outlet pipes of the crankcase ventilation pipe, thereby preventing icing when the ambient temperature reaches zero degrees Celsius or lower, and reducing the risk of crankcase ventilation pipe blockage.

[0026] This application also provides a crankcase, including a crankcase ventilation pipe and a crankcase ventilation pipe anti-icing device, wherein the crankcase ventilation pipe anti-icing device is the crankcase ventilation pipe anti-icing device disclosed in any of the above-mentioned solutions. Since the crankcase ventilation pipe anti-icing device has the above-mentioned technical effects, the crankcase with the crankcase ventilation pipe anti-icing device also has the same technical effects, and will not be described in detail here.

[0027] An engine includes a crankcase, which is the crankcase described in any of the above-mentioned embodiments. Since the crankcase has the aforementioned technical effects, the engine having this crankcase also has the same technical effects, and will not be elaborated further here. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0029] Figure 1 This is a schematic diagram of the structure of the crankcase ventilation pipe anti-icing device provided in the embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the structure of the intake pipe with a first heating sleeve provided in an embodiment of this application;

[0031] Figure 3 This is a cross-sectional view of the intake pipe with a first heating sleeve provided in an embodiment of this application.

[0032] in:

[0033] 1-First heating jacket; 101-Inlet; 102-Outlet; 103-Conical tube; 2-Second heating jacket; 3-Outlet water pipe; 4-Return water pipe; 5-Inlet air pipe; 6-Outlet air pipe; 7-Heating chamber; 8-Main pipe; 9-Branch pipe; 10-First electrically controlled water valve; 11-Check valve; 12-Second electrically controlled water valve; 13-First temperature measuring device; 14-Second temperature measuring device; 15-Third electrically controlled water valve; 16-Radiator; 17-Engine circulating water pump; 18-Oil-gas separator. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0035] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0036] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The oil-gas mixer in the crankcase passes through the oil-gas separator 18, and the separated oil flows back to the engine oil pan for continued use, while the separated gas is introduced into the engine intake manifold 5.

[0041] The gas leak contains water vapor. At room temperature, the water vapor exists in a gaseous state and mixes with fresh air to participate in re-combustion. When the ambient temperature reaches zero degrees or lower, the water vapor liquefies and remains in the inlet pipe 5 and outlet pipe 6 of the oil-gas separator 18, and freezes, causing blockage in the inlet pipe 5 and outlet pipe 6.

[0042] The combustion of fuel in the engine cylinders generates a large amount of heat, some of which is carried away by the engine cooling water. The temperature of the cooling water after absorbing heat is close to 100°C, making it a high-quality heat source.

[0043] Firstly, such as Figure 1 As shown, this application discloses a crankcase ventilation pipe anti-icing device. This crankcase ventilation pipe anti-icing device uses the aforementioned high-quality heat source to heat the intake pipe 5 and the exhaust pipe 6 of the crankcase ventilation pipe, so as to prevent the intake pipe 5 and the exhaust pipe 6 from freezing when the ambient temperature reaches zero degrees or lower, thereby reducing the risk of crankcase ventilation pipe blockage.

[0044] Crankcase ventilation pipe blockage includes blockage of intake pipe 5 or exhaust pipe 6, or blockage of both intake pipe 5 and exhaust pipe 6.

[0045] The crankcase ventilation pipe anti-icing device includes a first heating sleeve 1 and a second heating sleeve 2. One of the first heating sleeve 1 and the second heating sleeve 2 is fitted outside the air inlet pipe 5 of the crankcase ventilation pipe, and the other of the first heating sleeve 1 and the second heating sleeve 2 is fitted outside the air outlet pipe 6 of the crankcase ventilation pipe.

[0046] like Figure 1 As shown, in an embodiment where the first heating sleeve 1 is fitted outside the air inlet pipe 5 and the second heating sleeve 2 is fitted outside the air outlet pipe 6, a heating chamber 7 is formed between the first heating sleeve 1 and the air inlet pipe 5, and between the second heating sleeve 2 and the air outlet pipe 6.

[0047] The heating chamber 7 has an inlet 101 and an outlet 102. A high-quality heat source enters the heating chamber 7 through the inlet 101 and is discharged through the outlet 102 after heat exchange.

[0048] The first heating jacket 1 and the second heating jacket 2 are arranged in parallel or in series.

[0049] like Figure 1 As shown in the embodiment where the first heating jacket 1 and the second heating jacket 2 are arranged in parallel, the inlet 101 of the first heating jacket 1 and the second heating jacket 2 are connected to the engine's water outlet pipe 3, and the outlet 102 of the first heating jacket 1 and the second heating jacket 2 are connected to the engine's water return pipe 4. Cooling water from the engine is simultaneously supplied to the first heating jacket 1 and the second heating jacket 2, heating the inlet pipe and the outlet pipe 3 simultaneously. After heat exchange, the cooling water returns to the engine's water circulation system.

[0050] When the first heating jacket 1 and the second heating jacket 2 are connected in series (not shown in the figure), the inlet 101 of the first heating jacket 1 is connected to the engine's water outlet pipe 3, the outlet 102 of the first heating jacket 1 is connected to the inlet 101 of the second heating jacket 2, and the outlet 102 of the second heating jacket 2 is connected to the return water pipe 4. Cooling water from the engine is sequentially supplied to the first heating jacket 1 and the second heating jacket 2. In the embodiment where the first heating jacket 1 is fitted onto the intake pipe 5 and the second heating jacket 2 is fitted onto the exhaust pipe 6, the cooling water from the engine first heats the intake pipe 5 and then heats the exhaust pipe 6; in the embodiment where the first heating jacket 1 is fitted onto the exhaust pipe 6 and the second heating jacket 2 is fitted onto the intake pipe 5, the cooling water from the engine first heats the exhaust pipe 6 and then heats the intake pipe 5.

[0051] It should be noted that the inlet 101 and outlet 102 of the first heating jacket 1 and the second heating jacket 2 are the inlet 101 and outlet 102 of the heating chamber 7, respectively.

[0052] The crankcase ventilation pipe anti-icing device disclosed in this application uses the engine's cooling water as its heat source, thus realizing the secondary utilization of engine heat; the cooling water after heat exchange returns to the engine water circulation, so there is no waste of water resources.

[0053] To improve the heating effect on the inlet pipe 5 and outlet pipe 6, the flow direction of the cooling water in the heating chamber 7 is opposite to the flow direction of the gas in the inlet pipe 5 and / or outlet pipe 6.

[0054] Optionally, the flow direction of cooling water in the heating chamber 7 is opposite to the flow direction of gas in the intake pipe 5.

[0055] In other alternative embodiments, the flow direction of cooling water in the heating chamber 7 is opposite to the flow direction of gas in the outlet pipe 6.

[0056] In some other embodiments, the flow direction of cooling water in the heating chamber 7 is opposite to the flow direction of gas in the inlet pipe 5 and the outlet pipe 6.

[0057] The intake pipe 5 and / or the exhaust pipe 6 adopt counter-current heat exchange, which can achieve maximum heat exchange and effectively prevent the icing problem of the intake pipe 5 and / or the exhaust pipe 6.

[0058] like Figure 2 As shown, the inlet 101 is located below the heating jacket (a collective term for the first heating jacket 1 and the second heating jacket 2), and the outlet 102 is located above the heating jacket, further extending the time that high-quality heat acts within the heating jacket and improving heat exchange efficiency.

[0059] The cooling water flows in the same direction as the gas flows in the inlet pipe 5 and / or outlet pipe 6.

[0060] In some embodiments, the first heating sleeve 1 and its cross-section along the direction perpendicular to its own length are circular, the air inlet pipe 5 and the air outlet pipe 6 are also circular along the direction perpendicular to their own length, and the heating cavity 7 is an annular cavity, the inner ring of the annular cavity being the outer wall of the air inlet pipe 5 or the air outlet pipe 6.

[0061] Taking an example where the first heating sleeve 1 is fitted outside the air inlet pipe 5 and the second heating sleeve 2 is fitted outside the air outlet pipe, the first heating sleeve 1 is shaped to fit the air inlet pipe 5, and the second heating sleeve 2 is shaped to fit the air outlet pipe 6. The extending direction of the first heating sleeve 1 is consistent with the extending direction of the air inlet pipe 5, and the extending direction of the second heating sleeve 2 is consistent with the extending direction of the air outlet pipe. For example, as shown... Figure 1 As shown, the first heating jacket 1 includes a first pipe section, a second pipe section and a third pipe section. There is a corner between the first pipe and the second pipe, and there is a corner between the second pipe section and the third pipe section. The third pipe section is bent downward relative to the second pipe section. The outlet 102 is located in the first pipe section and the inlet 101 is located in the third pipe section.

[0062] The first heating jacket 1 and the second heating jacket 2 each have tapered tubes 103 extending along their length, and the tapered tubes 103 are connected to the air inlet pipe 5 or the air outlet pipe 6. For example... Figure 3 As shown, the smaller diameter end of the tapered tube 103 is connected to the air inlet pipe 5 or the air outlet pipe 6, and the larger diameter end of the tapered tube 103 is connected to the middle position of the first heating sleeve 1 or the second heating sleeve 2.

[0063] It should be noted that the heating chamber 7 formed by the first heating sleeve 1 and the second heating sleeve 2 outside the air inlet pipe 5 and the air outlet pipe 6 is a sealed chamber.

[0064] When the first heating jacket 1 and the second heating jacket 2 are connected in parallel, the first heating jacket 1 and the second heating jacket 2 are connected to the water outlet pipe 3 through the main pipe 8 and the two branch pipes 9. The inlet 101 of the main pipe 8 is connected to the water outlet pipe 3, the outlet 102 of the main pipe 8 is connected to the inlet 101 of the two branch pipes 9, and the outlet 102 of the two branch pipes 9 are connected to the first heating jacket 1 and the second heating jacket 2 respectively.

[0065] The main pipe 8 is equipped with a first electrically controlled water valve 10 and a check valve 11, and / or the branch pipe 9 is equipped with a second electrically controlled water valve 12.

[0066] An electrically controlled water valve, also known as an electrically controlled water valve, controls the flow and size of water through electrical signals or electric drive. A first electrically controlled water valve 10 and a check valve 11 are installed on the main pipe 8. The first electrically controlled water valve 10 controls the connection between the engine's outlet pipe 3 and the main pipe 8, and regulates the flow rate of the high-quality heat source in the main pipe 8. The check valve 11 prevents backflow of water entering the main pipe 8. A second electrically controlled water valve 12 on each branch pipe 9 controls the connection between each branch pipe 9 and the main pipe 8, and the flow rate of the high-quality heat source in each branch pipe 9.

[0067] The first electrically controlled water valve 10 and the second electrically controlled water valve 12 are configured with an opening strategy and will open upon reaching a set condition. Optionally, when the ambient temperature is detected to be 0°C or below 0°C, the first electrically controlled water valve 10 and the second electrically controlled water valve 12 will open, controlling the flow of high-quality heat into the first heating jacket 1 and / or the second heating jacket 2 to heat the inlet pipe and / or outlet pipe 3 where freezing is a problem.

[0068] The inlet 101 of the first heating jacket 1 is provided with a first temperature measuring device 13 for monitoring the inlet water temperature, and the outlet 102 of the first heating jacket 1 is provided with a second temperature measuring device 14 for monitoring the return water temperature; and / or, the inlet 101 of the second heating jacket 2 is provided with a first temperature measuring device 13, and the outlet 102 of the second heating jacket 2 is provided with a second temperature measuring device 14.

[0069] Optionally, the first temperature measuring device 13 is a thermometer.

[0070] By monitoring the temperature changes at the inlet 101 and outlet 102 of the first heating jacket 1 and / or the second heating jacket 2, the heat exchange is monitored, and the opening of the first electrically controlled water valve 10, the second electrically controlled water valve 12 and the third electrically controlled water valve 15 are adjusted according to the heat exchange to improve the system control accuracy.

[0071] A third electrically controlled water valve 15 is provided at the outlet 102 of the first heating jacket 1 and / or the second heating jacket 2.

[0072] Secondly, this application also provides a crankcase, including a crankcase ventilation pipe and a crankcase ventilation pipe anti-icing device, wherein the crankcase ventilation pipe anti-icing device is the crankcase ventilation pipe anti-icing device disclosed in any of the above-mentioned solutions.

[0073] Since the crankcase ventilation pipe anti-icing device has the above-mentioned technical effects, the crankcase with the crankcase ventilation pipe anti-icing device also has the same technical effects, which will not be elaborated here.

[0074] In some embodiments, the intake pipe 5 and / or exhaust pipe 6 of the crankcase ventilation pipe are corrugated pipes. Optionally, the intake pipe 5 and / or exhaust pipe 6 at the position corresponding to the heating jacket are corrugated pipe structures to increase the contact area between the intake pipe 5 and / or exhaust pipe 6 and the high-quality heat source, increase the heat exchange area, and increase the heating effect.

[0075] An engine includes a crankcase, which is the crankcase described in any of the above-mentioned embodiments. Since the crankcase has the aforementioned technical effects, the engine having this crankcase also has the same technical effects, and will not be elaborated further here.

[0076] like Figure 1 As shown, the outlet 102 of the crankcase ventilation pipe anti-icing device is connected to the pipeline between the radiator 16 and the engine circulating water pump 17. The cooling water discharged from the outlet 102 of the crankcase ventilation pipe anti-icing device flows back to the engine through the engine circulating water pump 17.

[0077] The water from the engine's outlet pipe 3 is split into two streams: one enters the crankcase ventilation pipe anti-icing device, and the other enters the radiator 16. The high-quality heat source entering the crankcase ventilation pipe anti-icing device is cooled by the crankcase ventilation pipe, while the cooling water entering the radiator 16 is cooled by the radiator 16. The water cooled by the radiator 16 and the water cooled by the crankcase ventilation pipe then flow into the engine circulating water pump 17.

[0078] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A crankcase ventilation tube anti-icing device, characterized in that, Including a first heating jacket (1) and a second heating jacket (2); The first heating jacket (1) and the second heating jacket (2) are connected in parallel. The inlet (101) of the first heating jacket (1) and the second heating jacket (2) are connected to the water outlet pipe (3) of the engine, and the outlet (102) of the first heating jacket (1) and the second heating jacket (2) are connected to the water return pipe (4) of the engine. or, The first heating jacket (1) and the second heating jacket (2) are connected in series. The inlet (101) of the first heating jacket (1) is connected to the water outlet pipe (3) of the engine. The outlet (102) of the first heating jacket (1) is connected to the inlet (101) of the second heating jacket (2). The outlet (102) of the second heating jacket (2) is connected to the return water pipe (4). One of the first heating sleeve (1) and the second heating sleeve (2) is fitted outside the intake pipe (5) of the crankcase ventilation pipe, and the other of the first heating sleeve (1) and the second heating sleeve (2) is fitted outside the exhaust pipe (6) of the crankcase ventilation pipe to form a heating cavity (7) outside the intake pipe (5) and the exhaust pipe (6), and the heating cavity (7) is connected to the inlet (101) and the outlet (102).

2. The crankcase ventilation tube anti-icing device of claim 1, wherein, The flow direction of the cooling water from the engine in the heating chamber (7) is opposite to the flow direction of the gas in the intake pipe (5) and / or the exhaust pipe (6).

3. The crankcase ventilation tube anti-icing device of claim 1, wherein, The first heating sleeve (1) and the second heating sleeve (2) have circular cross-sections along their length direction; The first heating sleeve (1) and the second heating sleeve (2) have tapered tubes (103) at both ends in the length extension direction, and the tapered tubes (103) are connected to the air inlet pipe (5) or the air outlet pipe (6).

4. The crankcase ventilation tube anti-icing device of claim 1, wherein, When the first heating jacket (1) and the second heating jacket (2) are connected in parallel, the first heating jacket (1) and the second heating jacket (2) are connected to the water outlet pipe (3) through the main pipe (8) and two branch pipes (9). The inlet (101) of the main pipe (8) is connected to the water outlet pipe (3), the outlet (102) of the main pipe (8) is connected to the inlet (101) of the two branch pipes (9), and the outlet (102) of the two branch pipes (9) are connected to the first heating jacket (1) and the second heating jacket (2) respectively. The main pipe (8) is provided with a first electrically controlled water valve (10) and a one-way valve (11), and / or the branch pipe (9) is provided with a second electrically controlled water valve (12).

5. The crankcase ventilation pipe anti-icing device according to claim 1, characterized in that, The inlet (101) of the first heating jacket (1) is provided with a first temperature measuring device (13) for monitoring the inlet water temperature, and the outlet (102) of the first heating jacket (1) is provided with a second temperature measuring device (14) for monitoring the return water temperature. And / or, The first temperature measuring device (13) is provided at the inlet (101) of the second heating jacket (2), and the second temperature measuring device (14) is provided at the outlet (102) of the second heating jacket (2).

6. The crankcase ventilation pipe anti-icing device according to claim 1, characterized in that, The outlet (102) of the first heating jacket (1) and / or the second heating jacket (2) is provided with a third electrically controlled water valve (15).

7. A crankcase, characterized in that, It includes a crankcase ventilation pipe and a crankcase ventilation pipe anti-icing device, wherein the crankcase ventilation pipe anti-icing device is the crankcase ventilation pipe anti-icing device according to any one of claims 1-6.

8. The crankcase according to claim 7, characterized in that, The intake pipe (5) and / or exhaust pipe (6) of the crankcase ventilation pipe are corrugated pipes.

9. An engine, characterized in that, Includes a crankcase, wherein the crankcase is the crankcase described in any one of claims 7-8.

10. The engine according to claim 9, characterized in that, The outlet (102) of the crankcase ventilation pipe anti-icing device is connected to the pipeline between the radiator (16) and the engine circulating water pump (17).

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