A water bath type engine cooling device

Abstract

The present invention discloses a water bath type engine cooling device, belonging to the field of engine cooling, comprising a water jacket, a water bath cavity is arranged inside the water jacket, a combustion chamber is arranged in the water bath cavity, an air intake pipe channel and an exhaust pipe channel located on opposite sides are opened on the side wall of the water jacket, two water intake channels are installed on the side wall of the water jacket, the two water intake channels are symmetrically arranged on both sides of the exhaust pipe channel, a drainage channel is installed on the side wall of the water jacket, the drainage channel is located beside the air intake pipe channel, the air intake pipe channel, the exhaust pipe channel, the water intake channel, and the drainage channel are connected to the water bath cavity respectively. Flowing water can be directly sprayed onto the exhaust pipe channel to improve the cooling effect of the high temperature area on the exhaust side, and form strong turbulence around the combustion chamber, with a large heat transfer coefficient and high heat dissipation efficiency, ensuring that the temperature rise does not exceed the design range.

Description

Technical Field

[0001] The invention belongs to the technical field of engine cooling, in particular to a water bath type engine cooling device. Background Art

[0002] The combustion chamber of the engine generates a lot of heat during the combustion process. If the heat is not dissipated in time, the engine will overheat, affect normal operation or even be damaged. Therefore, a water jacket is usually set outside the cylinder head. The water jacket casts a coolant flow channel that is connected to the coolant flow channel on the cylinder wall. The temperature of the combustion chamber and the inner wall of the cylinder is transferred to the coolant through heat conduction, realizing effective heat transfer.

[0003] However, cavity castings have complex structures, are difficult to manufacture, have long cycles, and have high production costs. In addition, they are prone to forming flow dead zones due to large flow resistance, which affects the cooling effect. Summary of the invention

[0004] The object of the present invention is to provide a water bath type engine cooling device to solve the problems raised in the above background technology.

[0005] The present invention provides a water bath type engine cooling device, comprising a water jacket, a water bath cavity is provided inside the water jacket, a combustion chamber is arranged in the water bath cavity, an intake pipe channel and an exhaust pipe channel are provided on opposite sides of the side wall of the water jacket, two water inlet channels are provided on the side wall of the water jacket, the two water inlet channels are arranged on both sides of the exhaust pipe channel, and a drainage channel is installed on the side wall of the water jacket, and the drainage channel is located next to the intake pipe channel;

[0006] The air inlet pipe channel, the exhaust pipe channel, the water inlet channel and the drainage channel are respectively connected to the water bath chamber.

[0007] As a further solution of the present invention: the water jacket includes a first shell and a second shell, the first shell and the second shell are combined to form a cylindrical water bath chamber, the air inlet pipe channel and the drainage channel are arranged on the side wall of the first shell, and the exhaust pipe channel and the water inlet channel are arranged on the side wall of the second shell.

[0008] As a further solution of the present invention: the first shell includes a first outer shell, a first inner shell, and a shell end surface connecting the first outer shell and the first inner shell;

[0009] The second shell comprises a second outer shell and a second inner shell, a support rod is provided between the second outer shell and the second inner shell, one end of the support rod is connected to the inner wall of the second outer shell, and the other end is connected to the outer wall of the second inner shell;

[0010] The first inner shell and the second inner shell cooperate to form a water bath chamber, and the first outer shell and the second outer shell cooperate to form a water tank.

[0011] As a further solution of the present invention: a threaded bottom hole is provided on the outer wall of the first inner shell, and the end surface of the threaded bottom hole close to the second inner shell is flush with the side plane of the first inner shell;

[0012] The end surface of one end of the support rod connected to the outer wall of the second inner shell is flush with the side plane of the second inner shell, and a bolt assembly hole is provided on the end surface of the support rod that is flush with the side plane of the second inner shell;

[0013] The side plane of the first inner shell is fitted with the side plane of the second inner shell, and the bolt assembly hole corresponds to the threaded bottom hole.

[0014] As a further solution of the present invention: one end of the water jacket is sealed with the valve chamber bottom plate, and the other end is provided with a support plate, the support plate is provided with a first central through hole connected to the water bath cavity, and one end of the water jacket close to the support plate is provided with a water platform protruding toward the water bath cavity.

[0015] As a further solution of the present invention: the support plate includes a support plate bottom plate, a support plate inner vertical plate and a support plate outer vertical plate, one side of the support plate inner vertical plate abuts against the outer wall of the combustion chamber, and the other side abuts against the inner wall of the water table, the support plate bottom plate protrudes from the support plate inner vertical plate to form an end face seal, and the support plate outer vertical plate is sealed and connected to the end of the water jacket.

[0016] As a further solution of the present invention: a sealing groove is provided on the surface where the end of the water jacket cooperates with the outer vertical plate of the support plate and the bottom plate of the support plate, and a sealing ring is provided in the sealing groove.

[0017] As a further solution of the present invention: a weight-reducing hole and a first assembly hole are further provided on the end surface of the first housing close to the valve chamber bottom plate;

[0018] The end surface of the second housing close to the valve chamber bottom plate is also provided with a second assembly hole.

[0019] As a further solution of the present invention: the combustion chamber includes a cylinder body and a cylinder head connected to one end of the cylinder body, the cylinder head is provided with an intake pipe, an exhaust pipe and a spark plug mounting conduit, the spark plug mounting conduit is located between the intake pipe and the exhaust pipe, the intake pipe is provided with an intake valve conduit, the exhaust pipe is provided with an exhaust valve conduit, a connecting plate is provided at the end of the spark plug mounting conduit, the ends of the intake valve conduit and the exhaust valve conduit are connected to the connecting plate, and holes are opened on the connecting plate to communicate with the spark plug mounting conduit, the intake valve conduit and the exhaust valve conduit respectively.

[0020] As a further solution of the present invention: the water inlet channel is provided with a jet port at one end of the water bath chamber, and the jet ports of the two water inlet channels are respectively directed toward the exhaust pipe.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The water jacket provided in this application has a water bath cavity, and the combustion chamber can be directly accommodated in the water bath cavity. Water inlet channels are set on both sides of the exhaust pipe channel, and flowing water can be directly sprayed onto the exhaust pipe channel to improve the cooling effect of the high-temperature area on the exhaust side, and form strong turbulence around the combustion chamber, filling the water bath cavity, and providing water bath cooling for the combustion chamber. It has a large heat transfer coefficient and high heat dissipation efficiency, ensuring that the temperature rise does not exceed the design range. The water jacket fully surrounds the cylinder block, cylinder head and exhaust pipe area, and performs jet cooling on the hot spots on the exhaust side of the combustion chamber. The cooling consistency is good, there are no local hot spots, and the risk of knock is greatly reduced.

[0023] 2. The water jacket adopts split type, which is convenient for disassembly and assembly. The shape of the water jacket is cylindrical, and there is no dead zone of flow.

[0024] 3. The first shell and the second shell adopt a double-layer structure of inner and outer shells, forming a water bath chamber in the inner shell and a water tank between the inner and outer shells. There is no need for an external water tank, which saves a lot of pipes and complex flow path design and reduces the risk of leakage.

[0025] 4. The water jacket has a simple structure and is easy to manufacture. The area between the water jacket and the combustion chamber is the cooling water flow area. The water jacket can be made of plastic, and the raw materials are cheap, which achieves the purpose of weight reduction and cost reduction, improves the engine power-to-weight ratio, and greatly reduces the risk of knock in high compression ratio engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the structure of the water jacket in an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the longitudinal structure of an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of a top-down structure of an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the assembly structure of the water jacket and the combustion chamber in the embodiment of the present invention (the second shell and the support plate are not assembled)

[0031] Figure 5 It is a schematic diagram of the structure of the first shell in some embodiments of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the second housing in some embodiments of the present invention;

[0033] Figure 7 is a schematic diagram of the structure of a combustion chamber in some embodiments of the present invention;

[0034] Figure 8 It is a schematic diagram of a half-section structure of some embodiments of the present invention;

[0035] Fig. 9 is a schematic structural diagram of a support plate in an embodiment of the present invention;

[0036] Fig.10 This is a simulation result diagram of the cooling water flow velocity field of the present invention;

[0037] Fig.11 This is the simulation result diagram of the cooling water flow velocity field of the existing casting water jacket.

[0038] In the figure: 1-water jacket; 11-first shell; 111-intake pipe channel; 112-first through groove; 113-weight reduction hole; 114-threaded bottom hole; 115-first assembly hole; 116-drainage channel; 117-first outer shell; 118-first inner shell; 119-water platform; 12-second shell; 121-exhaust pipe channel; 122-water inlet channel; 1221-injection port; 123-second outer shell; 124-second inner shell; 125-support Support rod; 1251-bolt assembly hole; 126-second through groove; 127-second assembly hole; 13-water tank; 2-water bath chamber; 3-combustion chamber; 31-cylinder body; 32-cylinder head; 33-intake pipe; 34-exhaust pipe; 35-intake valve guide; 36-exhaust valve guide; 37-spark plug mounting guide; 4-connecting plate; 5-support plate; 51-support plate inner plate; 52-support plate bottom plate; 53-support plate outer plate; 6-valve chamber bottom plate. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 2As shown, this embodiment provides a water bath type engine cooling device, including a water jacket 1, wherein a water bath cavity 2 is provided inside the water jacket 1, and a combustion chamber 3 is arranged inside the water bath cavity 2. The side wall of the water jacket 1 is provided with an intake pipe channel 111 and an exhaust pipe channel 121 located on opposite sides, wherein the intake pipe channel 111 is for the intake pipe of the combustion chamber 3 to pass through, and the exhaust pipe channel 121 is for the exhaust pipe of the combustion chamber 3 to pass through. The side wall of the water jacket 1 is also provided with two water inlet channels 122, which are symmetrically arranged on both sides of the exhaust pipe channel 121, and the side wall of the water jacket 1 is also provided with a drainage channel 116, which is located next to the intake pipe channel 111. The intake pipe channel 111, the exhaust pipe channel 121, the water inlet channel 122, and the drainage channel 116 are respectively connected to the water bath cavity 2.

[0042] The combustion chamber 3 is placed in the water bath chamber 2, so that the water bath chamber 2 becomes the cooling water flow area. The cooling water enters the water bath chamber 2 from the water inlet channel 122 and is discharged from the water bath chamber 2 from the drainage channel 116. The flowing water can be directly sprayed onto the exhaust pipe of the combustion chamber 3, ensuring that the water flow is in a turbulent state in the high-temperature area on the exhaust side, with a large heat transfer coefficient and high heat dissipation efficiency. For the simulation result diagram of the cooling water flow velocity field of the present invention, please refer to Fig.10 , please refer to the simulation results of the cooling water flow velocity field of the existing casting water jacket Fig.11 It can be seen that compared with the existing casting water jacket, the flow rate in the hot spot area on the exhaust side of this solution is fast, and the flow rate in other areas is uniform. The turbulence intensity of this solution is higher than that of the existing casting water jacket, and the peak flow rate of cooling water in this application is more than double the peak flow rate of cooling water in the existing casting water jacket. The test results of the cooling water flow rate in the high temperature area on the exhaust side of the water bath water jacket of the existing casting water jacket and this embodiment are shown in Table 1:

[0043]

[0044] The water jacket 1 fully surrounds the cylinder block, cylinder head and exhaust pipe area of ​​the combustion chamber 3, and performs jet cooling on the hot spots on the exhaust side of the combustion chamber 3. The cooling consistency is good, and there are no local hot spots in the combustion chamber (the average temperature is less than 100°C), which greatly reduces the risk of detonation.

[0045] The present invention has a simple structure, is easy to process and manufacture, can be directly injection molded, achieves weight reduction and cost reduction, improves the engine power-to-weight ratio, and significantly reduces the risk of knocking in high compression ratio engines. The design of combining overall water capacity and local water flow rate is used to enhance the cooling effect, achieve uniform global temperature distribution, and reduce cooling energy consumption.

[0046] In some embodiments, see Figure 3 , Figure 4As shown, the water jacket includes a first shell 11 and a second shell 12, and the first shell 11 and the second shell 12 are matched to form a cylindrical water bath chamber 2. The water jacket adopts a split type, which is convenient for disassembly and assembly. The water jacket is cylindrical in shape and has no dead zone. The air inlet pipe channel 111 and the drainage channel 116 are arranged on the side wall of the first shell 11, and the exhaust pipe channel 121 and the water inlet channel 122 are arranged on the side wall of the second shell 12.

[0047] In some embodiments, see Figure 5 , Figure 6 As shown, the first shell 11 is a double-layer structure, including a first outer shell 117, a first inner shell 118, and a shell end face connecting the first outer shell 117 and the first inner shell 118. A first through groove 112 is provided in the middle of the shell end face, and a weight-reducing hole 113 and a first assembly hole 115 are also provided on the shell end face. A threaded bottom hole 114 is provided on the outer wall of the first inner shell 118, and the end face of the threaded bottom hole 114 close to the second inner shell 124 is flush with the side plane of the first inner shell 118. Four threaded bottom holes 114 can be provided, and the four threaded bottom holes 114 are distributed in a rectangular shape.

[0048] The second shell 12 is a double-layer structure, including a second outer shell 123 and a second inner shell 124. A support rod 125 is provided between the second outer shell 123 and the second inner shell 124. One end of the support rod 125 is connected to the inner wall of the second outer shell 123, and the other end is connected to the outer wall of the second inner shell 124. The end surface of the support rod 125 connected to the outer wall of the second inner shell 124 is flush with the side plane of the second inner shell 124, and the end surface of the support rod 125 flush with the side plane of the second inner shell 124 is provided with a bolt assembly hole 1251. Four support rods 125 can be provided, and the four support rods 125 are distributed in a rectangular shape, corresponding to the four threaded bottom holes 114 respectively. A second through groove 126 is provided on the end surface of the second inner shell 124 close to the valve chamber bottom plate 6, and a second assembly hole 127 is also provided on the end surface of the second shell 12 close to the valve chamber bottom plate 6.

[0049] The first shell 11 and the second shell 12 are matched, that is, the side plane of the first shell 11 is tightly attached to the side plane of the second shell 12, and the screw is screwed into the threaded bottom hole 114 at the corresponding position through the bolt assembly hole 1251. Here, the bolt assembly hole 1251 can be a countersunk hole. The first inner shell 118 and the second inner shell 124 cooperate to form the water bath chamber 2, the first outer shell 117 and the second outer shell 123 cooperate to form the water tank 13, and the first through groove 112 and the second through groove 126 cooperate to form the second central through hole. In order to ensure the sealing effect, a sealing strip is provided on the side plane of the first shell 11 and / or the second shell 12. Specifically, a groove can be opened on the side plane of the second inner shell 124 to pad the sealing strip, so that the first inner shell 118 and the second inner shell 124 are sealed and matched. Specifically, the side planes of the first outer shell 117 and the second outer shell 123 can also be sealed by applying glue. The air inlet channel 111 is connected to the first inner shell 118 and the first outer shell 117. The drainage channel 116 passes through the first inner shell 118 and is located in the water bath chamber 2 at one end, and is located in the water tank 13 or extends out of the first outer shell 117 to connect to an external water source. The exhaust pipe channel 121 is connected to the second outer shell 123 and the second inner shell 124. The water inlet channel 122 passes through the second inner shell 124 and is located in the water bath chamber 2 at one end, and is located in the water tank 13 or extends out of the second outer shell 123 to connect to an external water source. If the water inlet channel 122 and the drainage channel 116 are circulated through the water tank 13, the cooling system of the combustion chamber is integrated into the water jacket, eliminating a large number of pipelines and complex flow path design, thereby achieving the purpose of reducing weight and cost.

[0050] In some embodiments, one end of the water jacket 1 is sealed with the valve chamber bottom plate 6, and the other end is provided with a support plate 5. The valve chamber bottom plate 6 is fixed to the support plate 5 by bolts passing through the water jacket 1, and the support plate 5 is provided with a first central through hole communicating with the water bath chamber 2. The first assembly hole 115 and the second assembly hole 127 are provided for the bolts connecting the valve chamber bottom plate 6 and the support plate 5 to pass through, thereby completing the packaging of the two ends of the water jacket 1.

[0051] The first inner shell 118 and the second inner shell 124 are provided with a water platform 119 protruding toward the water bath chamber 2 at one end close to the support plate 5. The end surface of the combustion chamber 3 is first welded to the support plate 5 to prevent the water jacket 1 from being damaged by excessive welding temperature. Then, the combustion chamber 3 is placed into the water bath chamber 2 to make the support plate 5 and the water jacket 1 seal. The provision of the water platform 119 ensures the volume of the water bath chamber 2.

[0052] In some embodiments, see Fig. 9As shown, the support plate 5 includes a support plate bottom plate 52, a support plate inner plate 51 and a support plate outer plate 53. The end face of the combustion chamber 3 is welded to the support plate bottom plate 52. The piston cavity inside the combustion chamber 3 is connected to the first central through hole. The support plate bottom plate 52 is sealed with the end face of the water table 119, the end face of the first shell 117, and the end face of the second shell 123. One side of the support plate inner plate 51 abuts against the outer wall of the combustion chamber 3, and the other side abuts against the inner wall of the water table 119. The support plate bottom plate 52 protrudes from the support plate inner plate 51 to form an end face seal. In order to ensure the sealing effect, a sealing groove is provided on the assembly surface of the water table 119 and the support plate bottom plate 52 for shimming a sealing ring, and a sealing groove is also provided on the end face of the first shell 117 and the end face of the second shell 123 for shimming a sealing ring. The support plate outer plate 53 is sealed and connected to the end of the water jacket 1, and the support plate 5 and the valve chamber bottom plate 6 are tightened by bolts.

[0053] In some embodiments, see Figure 7 As shown, the combustion chamber 3 includes a cylinder body 31 and a cylinder head 32 connected to one end of the cylinder body 31. The cylinder head 32 is provided with an intake pipe 33, an exhaust pipe 34 and a spark plug installation conduit 37. The spark plug installation conduit 37 is located between the intake pipe 33 and the exhaust pipe 34. The intake pipe 33 is provided with an intake valve conduit 35. The exhaust pipe 34 is provided with an exhaust valve conduit 36. A connecting plate 4 is provided at the end of the spark plug installation conduit 37. The ends of the intake valve conduit 35 and the exhaust valve conduit 36 ​​are connected to the connecting plate 4. The connecting plate 4 is provided with holes that are respectively connected to the spark plug installation conduit 37, the intake valve conduit 35 and the exhaust valve conduit 36.

[0054] The combustion chamber 3 is placed in the water bath chamber 2, the intake pipe 33 extends out of the water jacket 1 from the intake pipe channel 111, the exhaust pipe 34 extends out of the water jacket 1 from the exhaust pipe channel 121, the connecting plate 4 is located in the second central through hole, the valve mechanism passes through the valve chamber bottom plate 6 from the valve chamber and is installed in the intake valve guide 35 and the exhaust valve guide 36, and the spark plug passes through the valve chamber bottom plate 6 from the valve chamber and is installed in the spark plug installation guide 37. The matching contact surface of the valve chamber bottom plate 6 and the connecting plate 4 is provided with a sealing groove, and a sealing ring is provided in the sealing groove. The water inlet channel 122 is located at one end of the water bath chamber 2 and has an injection port 1221, and the injection ports 1221 of the two water inlet channels 122 are respectively facing the exhaust pipe 34.

[0055] In some embodiments, see Figure 8 As shown, the water jacket 1 is a single-layer cylinder structure, the interior of the cylinder is a water bath chamber 2, the water tank is external, and the water jacket 1 has a larger volume.

[0056] In some embodiments, the water jacket 1 is integrated with the valve chamber bottom plate 6 .

[0057] It should be noted that adhesive sealing can also be used at places that need to be sealed in the embodiment to prevent cooling water leakage.

[0058] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A water bath type engine cooling device, characterized in that: It comprises a water jacket, wherein a water bath cavity is provided inside the water jacket, a combustion chamber is arranged in the water bath cavity, a side wall of the water jacket is provided with an intake pipe channel and an exhaust pipe channel located on opposite sides, the side wall of the water jacket is further provided with two water inlet channels, the two water inlet channels are arranged on both sides of the exhaust pipe channel, and a drainage channel is further installed on the side wall of the water jacket, and the drainage channel is located next to the intake pipe channel; The air inlet pipe channel, the exhaust pipe channel, the water inlet channel, and the drainage channel are respectively connected to the water bath chamber; The water jacket comprises a first shell and a second shell, the first shell and the second shell are matched to form a cylindrical water bath chamber, the air inlet pipe channel and the drainage channel are arranged on the side wall of the first shell, and the exhaust pipe channel and the water inlet channel are arranged on the side wall of the second shell; The first shell includes a first outer shell, a first inner shell, and a shell end surface connecting the first outer shell and the first inner shell; The second shell comprises a second outer shell and a second inner shell, a support rod is provided between the second outer shell and the second inner shell, one end of the support rod is connected to the inner wall of the second outer shell, and the other end is connected to the outer wall of the second inner shell; The first inner shell and the second inner shell cooperate to form a water bath chamber, and the first outer shell and the second outer shell cooperate to form a water tank.

2. A water bath type engine cooling device according to claim 1, characterized in that: The outer wall of the first inner shell is provided with a threaded bottom hole, and the end surface of the threaded bottom hole close to the second inner shell is flush with the side plane of the first inner shell; The end surface of one end of the support rod connected to the outer wall of the second inner shell is flush with the side plane of the second inner shell, and a bolt assembly hole is provided on the end surface of the support rod that is flush with the side plane of the second inner shell; The side plane of the first inner shell is fitted with the side plane of the second inner shell, and the bolt assembly hole corresponds to the threaded bottom hole.

3. A water bath engine cooling device according to claim 1, characterized in that: One end of the water jacket is sealed with the valve chamber bottom plate, and the other end is provided with a support plate, the support plate is provided with a first central through hole connected to the water bath cavity, and one end of the water jacket close to the support plate is provided with a water platform protruding toward the water bath cavity.

4. A water bath engine cooling device according to claim 3, characterized in that: The support plate includes a support plate bottom plate, a support plate inner vertical plate and a support plate outer vertical plate. One side of the support plate inner vertical plate abuts against the outer wall of the combustion chamber, and the other side abuts against the inner wall of the water platform. The support plate bottom plate protrudes from the support plate inner vertical plate to form an end face seal, and the support plate outer vertical plate is sealed and connected to the end of the water jacket.

5. A water bath type engine cooling device according to claim 4, characterized in that: The surfaces of the ends of the water jacket that match the outer vertical plate of the support plate and the bottom plate of the support plate are provided with sealing grooves, and sealing rings are arranged in the sealing grooves.

6. A water bath type engine cooling device according to claim 1, characterized in that: The end surface of the first housing close to the valve chamber bottom plate is also provided with a weight reduction hole and a first assembly hole; The end surface of the second housing close to the valve chamber bottom plate is also provided with a second assembly hole.

7. A water bath engine cooling device according to any one of claims 1 to 6, characterized in that: The combustion chamber comprises a cylinder body and a cylinder head connected to one end of the cylinder body. An intake pipe, an exhaust pipe and a spark plug installation conduit are arranged on the cylinder head. The spark plug installation conduit is located between the intake pipe and the exhaust pipe. An intake valve conduit is arranged on the intake pipe. An exhaust valve conduit is arranged on the exhaust pipe. A connecting plate is arranged at the end of the spark plug installation conduit. The ends of the intake valve conduit and the exhaust valve conduit are connected to the connecting plate. Holes are arranged on the connecting plate and are respectively connected to the spark plug installation conduit, the intake valve conduit and the exhaust valve conduit.

8. A water bath type engine cooling device according to claim 7, characterized in that: The water inlet channel is located at one end of the water bath chamber and is provided with a jet port, and the jet ports of the two water inlet channels are respectively directed toward the exhaust pipe.

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