A large agricultural machinery cylinder head casting

Abstract

This application discloses a large agricultural machinery cylinder head casting, specifically relating to the field of agricultural machinery technology. It includes an outer cover with an inner cover installed inside, forming a sandwich between the outer and inner covers. The top edges of the inner cover are raised on both sides, dividing the sandwich into a top flow channel and two lateral flow channels. Several top baffles extend from the top of the inner cover, dividing the top flow channel into reciprocating tortuous flow channels. Several side baffles extend from the outer walls of the inner cover on both sides of the top flow channel, dividing the lateral flow channels into reciprocating tortuous flow channels. Connectors communicating with the sandwich extend from both ends of the outer cover. Liquid distribution plates extend from the two opposite outer walls of the inner cover, with the intersection of the liquid distribution plates located on the axis of adjacent connectors. This application provides a sandwich between the outer and inner covers, allowing circulating cooling water to circulate within the sandwich to cool the cylinder head. The cylinder head exhibits more uniform thermal expansion and contraction, thus improving its service life.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery technology, specifically relating to a large agricultural machinery cylinder head casting. Background Technology

[0002] Agricultural machinery, such as tractors and harvesters, is used for agricultural production operations. It can significantly improve the efficiency of tilling, sowing, and harvesting, reduce labor intensity, realize agricultural mechanization, and enhance agricultural production levels and economic benefits. Agricultural machinery is mostly powered by diesel engines. The cylinder head is a key component of the engine, located at the top of the cylinder. It houses the valve mechanism, controls intake and exhaust, seals the combustion chamber, and withstands high temperatures and pressures; its performance directly affects the power and efficiency of the agricultural machinery.

[0003] Existing agricultural machinery cylinder heads are typically large in size. After prolonged use, uneven thermal expansion and contraction can cause deformation, leading to gaps between the cylinder head and the cylinder body. This affects the cylinder head's sealing performance and reduces its service life. Therefore, a new type of large agricultural machinery cylinder head casting is needed. Summary of the Invention

[0004] To address the aforementioned problems, this utility model discloses a large agricultural machinery cylinder head casting.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A large agricultural machinery cylinder head casting includes an outer cover, an inner cover installed inside the outer cover, and a sandwich layer formed between the outer cover and the inner cover. The top two edges of the inner cover are raised to divide the sandwich layer into a top flow channel and two lateral flow channels. Several top baffles extend from the top of the inner cover to divide the top flow channel into reciprocating tortuous flow channels. Several side baffles extend from the two outer walls of the inner cover on both sides of the top flow channel to divide the lateral flow channels into reciprocating tortuous flow channels. Both ends of the outer cover extend into joints communicating with the sandwich layer. Two opposite outer walls of the inner cover extend into liquid distribution plates, and the intersection of the liquid distribution plates is on the axis of the adjacent joints.

[0007] As a preferred embodiment of this utility model, the top partitions are arranged in parallel and staggered configurations, and the side partitions are arranged in parallel and staggered configurations.

[0008] As a preferred embodiment of this utility model, the liquid distribution plate separates more than one-third of the flow of the connector into the top flow channel, and the remaining flow of the connector is evenly distributed to the two side flow channels.

[0009] As a preferred technical solution of this utility model, the outer cover is provided with an installation groove adapted to be inserted into the inner cover skirt, and the inner cover skirt is threadedly connected with a plurality of installation bolts that penetrate the outer cover skirt.

[0010] As a preferred technical solution of this utility model, a sealing ring is flattened between the outer cover skirt and the inner cover skirt, and both the outer cover and the inner cover are provided with annular grooves adapted to the sealing ring.

[0011] As a preferred embodiment of this utility model, the inner wall of the inner cover extends with a number of heat exchange fins.

[0012] As a preferred embodiment of this utility model, the heat exchange fins are a plurality of portal-shaped fins extending from the inner sidewall of the inner cover, and the plurality of portal-shaped fins are parallel to each other.

[0013] As a preferred embodiment of this utility model, the heat exchange fins are a plurality of long fins extending from the inner top wall of the inner cover and a plurality of short fins extending from the inner side wall of the inner cover, wherein the plurality of long fins are parallel to each other and the plurality of short fins are parallel to each other.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This application provides a sandwich between the outer and inner covers, through which circulating cooling water can be introduced to cool the cylinder head and make the overall temperature of the cylinder head more uniform. This results in more uniform thermal expansion and contraction of the cylinder head, significantly reducing the maximum operating temperature of the cylinder head and minimizing thermal expansion and contraction deformation. At the same time, the cylinder block is relatively thick and heavy, resulting in less thermal expansion and contraction deformation. Therefore, the sealing between the cylinder head and the cylinder block can be effectively maintained for a longer period of time, thus improving the service life of the cylinder head.

[0016] 2. The heat exchange fins of the inner cover of this application absorb heat and conduct it to the entire inner cover. The top flow channel and the two side flow channels set in the interlayer are all reciprocating tortuous flow channels. The cooling liquid can fully exchange heat with the inner cover body, as well as the top baffle and the side baffle, thereby removing the heat of the engine operation, and the heat exchange efficiency is high. Attached Figure Description

[0017] Figure 1 This is an exploded view of an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view from another angle of an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the outer cover of an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the inner cover and the liquid distribution plate in Embodiment 1 of this utility model;

[0021] Figure 5 This is a schematic diagram of the inner cover and the liquid distribution plate in Embodiment 2 of this utility model.

[0022] List of identifiers in attached diagrams:

[0023] 1. Outer cover; 101. Connector; 102. Mounting groove;

[0024] 2. Inner cover; 201. Side partition; 202. Top partition; 203. Portal fin; 204. Short fin; 205. Long fin;

[0025] 3. Separating plate; 4. Sealing ring; 5. Mounting bolts. Detailed Implementation

[0026] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0027] Please see Figure 1-5 A large agricultural machinery cylinder head casting includes an outer cover 1, an inner cover 2 installed inside the outer cover 1, and a sandwich layer formed between the outer cover 1 and the inner cover 2. The top edges of the inner cover 2 are raised on both sides, dividing the sandwich layer into a top flow channel and two lateral flow channels. Several top baffles 202 extend from the top of the inner cover 2, dividing the top flow channel into reciprocating tortuous flow channels, and several side baffles 201 extend from the two outer walls of the inner cover 2 on both sides of the top flow channel, dividing the lateral flow channels into reciprocating tortuous flow channels. Connectors 101 extending from both ends of the outer cover 1 communicate with the sandwich layer. The connectors 101 are provided with external threads for connection. Liquid distribution plates 3 extend from the two opposite outer walls of the inner cover 2, and the intersection of the liquid distribution plates 3 is on the axis of adjacent connectors 101. The top flow channel and the two lateral flow channels in the sandwich layer flow from one end of the outer cover 1 where the connectors 101 are located to the other end of the outer cover 1 where the connectors 101 are located. The distributor plate 3 controls the flow rate of cooling liquid flowing out of the top channel and the two side channels.

[0028] The outer cover 1 is cast as a main body, and then precision structures such as the connector 101 and the mounting groove 102 are precisely machined using a CNC lathe.

[0029] Several top baffles 202 are arranged parallel to each other and staggered, making the top flow channel a reciprocating tortuous flow channel. Several side baffles 201 are arranged parallel to each other and staggered, making the lateral flow channel a reciprocating tortuous flow channel. The top baffles 202 and side baffles 201 are made of a metal material with good thermal conductivity, which facilitates the transfer of heat from the inner cover 2 to the cooling liquid.

[0030] The separator 3 divides more than one-third of the flow of connector 101 into the top channel, and the remaining flow of connector 101 is evenly distributed to the two side channels. In the embodiment shown in the attached figure, the top channel connects to half of the flow of connector 101, and a single side channel connects to one-quarter of the flow of connector 101.

[0031] The outer cover 1 has a mounting groove 102 for fitting the skirt of the inner cover 2. The skirt of the inner cover 2 is threaded with several mounting bolts 5 that penetrate the skirt of the outer cover 1. A sealing ring 4 is flattened between the skirts of the outer cover 1 and the inner cover 2, and both the outer cover 1 and the inner cover 2 have annular grooves for fitting the sealing ring 4. The mounting bolts 5 securely connect the outer cover 1 and the inner cover 2, and the sealing ring 4 enhances the sealing at the connection point. The skirt of the outer cover 1 also has a through hole for connecting to the engine body.

[0032] The inner wall of the inner cover 2 has several heat exchange fins extending outwards to enhance the heat exchange efficiency between the inner cover 2 and the internal gases of the engine.

[0033] Example 1: The heat exchange fins are a number of portal-shaped fins 203 extending from the inner sidewall of the inner cover 2, and the portal-shaped fins 203 are parallel to each other.

[0034] In Example 2, the heat exchange fins consist of several long fins 205 extending from the inner top wall of the inner cover 2 and several short fins 204 extending from the inner side wall of the inner cover 2. The long fins 205 are parallel to each other, and the short fins 204 are also parallel to each other.

[0035] Working principle:

[0036] During installation, the inner cover 2 is installed inside the outer cover 1. The outer cover 1 and the inner cover 2 are fixedly connected by the mounting bolts 5, so that a sandwich is formed between the outer cover 1 and the inner cover 2. Then, the outer cover 1 is installed on the cylinder block of the engine so that the outer cover 1 covers the valve train on the top of the engine.

[0037] In front of the engine, the two connectors 101 of the outer cover 1 are connected to the cooling liquid circulation loop of the agricultural machinery. When the engine is running, the heat generated by the cylinder and piston will be conducted to the top of the engine, and the valve train will also generate heat when it is running. The heat at the top of the engine is absorbed by the heat exchange fins of the inner cover 2 and conducted to the entire inner cover 2. At the same time, the cooling liquid enters the interlayer from one of the connectors 101 of the outer cover 1. The cooling liquid entering the interlayer is divided by the distributor plate 3 into the top flow channel and the two side flow channels, and finally flows out from the other connector 101 of the outer cover 1. Since the top flow channel and the two side flow channels are reciprocating tortuous flow channels, the cooling liquid can fully exchange heat with the body of the inner cover 2, as well as the top baffle 202 and the side baffle 201, thereby removing the heat generated by the engine operation.

[0038] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. A large agricultural machine cylinder head casting comprising an outer cover (1), characterized in that, An inner cover (2) is installed on the inner side of the outer cover (1), and a sandwich is formed between the outer cover (1) and the inner cover (2). The top two sides of the inner cover (2) are raised to divide the sandwich into a top flow channel and two side flow channels. Several top partitions (202) extend from the top of the inner cover (2) to divide the top flow channel into a reciprocating tortuous flow channel. Several side partitions (201) extend from the outer side walls of the two inner covers (2) on both sides of the top flow channel to divide the side flow channel into a reciprocating tortuous flow channel. Both ends of the outer cover (1) extend to the connectors (101) that communicate with the sandwich. The two opposite outer side walls of the inner cover (2) extend to the liquid distribution plates (3), and the intersection of the liquid distribution plates (3) is on the axis of the adjacent connectors (101).

2. The large agricultural machine cylinder head casting of claim 1, wherein, The top partitions (202) are arranged parallel to each other and staggered, and the side partitions (201) are arranged parallel to each other and staggered.

3. The large agricultural machine cylinder head casting of claim 1, wherein, The separator (3) separates more than one-third of the flow of the connector (101) into the top channel, and the remaining flow of the connector (101) is evenly distributed to the two side channels.

4. The large agricultural machine cylinder head casting of claim 1, wherein, The outer cover (1) has an installation groove (102) adapted to be installed into the skirt of the inner cover (2), and the skirt of the inner cover (2) is threaded with a number of installation bolts (5) that penetrate the skirt of the outer cover (1).

5. The large agricultural machine cylinder head casting of claim 4, wherein, A sealing ring (4) is flattened between the skirt of the outer cover (1) and the skirt of the inner cover (2), and both the outer cover (1) and the inner cover (2) are provided with annular grooves that are adapted to the sealing ring (4).

6. The large agricultural machine cylinder head casting of claim 1, wherein, The inner wall of the inner cover (2) has several heat exchange fins extending from it.

7. The large agricultural machine cylinder head casting of claim 6, wherein, The heat exchange fins are a number of portal-shaped fins (203) extending from the inner sidewall of the inner cover (2), and the portal-shaped fins (203) are parallel to each other.

8. The large agricultural machine cylinder head casting of claim 6, wherein, The heat exchange fins are a number of long fins (205) extending from the inner top wall of the inner cover (2) and a number of short fins (204) extending from the inner side wall of the inner cover (2). The number of long fins (205) are parallel to each other, and the number of short fins (204) are parallel to each other.

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