Fuel injector cooling mounting structure and multi-fuel injector mounting structure

Abstract

The application provides an oil injector cooling mounting structure for mounting and cooling an oil injector and a cylinder head, wherein the cylinder head comprises a mounting hole for the oil injector to pass through and a cooling cavity, the cooling cavity is provided with cooling liquid, the cylinder head further comprises a cooling channel, the mounting hole comprises a first part mounting hole and a second part mounting hole, the first part mounting hole is exposed in the cooling cavity, and the second part mounting hole is communicated with the cooling cavity through the cooling channel; wherein the second part mounting hole further comprises a flow guide channel for guiding the cooling liquid to flow through the surface of the oil injector located in the second part mounting hole and form a cooling loop in the cooling cavity, the cooling channel and the second part mounting hole. The oil injector cooling mounting structure can simultaneously have better sealing effect and cooling effect. The application further provides a multi-oil injector mounting structure, which can reduce the total mounting volume, reduce the cost and be easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of fuel injectors, and more specifically to the field of multi-injector installation. Background Technology

[0002] Alternative fuels to traditional fossil fuels such as methanol and ammonia are increasingly being used in the engine field, showing broad development prospects. When these alternative fuels are used in compression ignition engines, they require a small amount of diesel fuel for ignition; therefore, these engines generally require multiple fuel injectors per cylinder head. When installing multiple injectors, the limited space on the cylinder head necessitates a simplified injector mounting structure to match the cylinder head layout. However, the injector mounting structure directly impacts the long-term reliability of the fuel supply system, and even the simplified structure must still meet reliability requirements.

[0003] Because the cylinder head near the firing surface is affected by the heat transfer from combustion inside the cylinder, the heat load is large and the cooling demand is strong. When multiple injectors are installed on a single cylinder head, the cooling structure must not only meet the cooling needs of the cylinder head and the injectors, but also ensure good structural sealing to avoid the risk of coolant leakage inside the cylinder. Therefore, the design difficulty of the cylinder head cooling structure is also increased when the number of injectors increases. Summary of the Invention

[0004] One object of the present invention is to provide an injector cooling mounting structure that has better cooling and sealing effects.

[0005] To achieve the above objectives, an injector cooling mounting structure is provided for cooling between the injector and the cylinder head. The cylinder head includes a mounting hole for the injector to pass through and a cooling chamber. Coolant is disposed within the cooling chamber. The cylinder head also includes a cooling channel. The mounting hole includes a first mounting hole and a second mounting hole. The first mounting hole is exposed within the cooling chamber, and the second mounting hole communicates with the cooling chamber through the cooling channel. The second mounting hole also includes a guide channel for guiding coolant flow across the injector surface located within the second mounting hole, forming a cooling circuit within the cooling chamber, cooling channel, and second mounting hole. This injector cooling mounting structure simultaneously provides excellent sealing and cooling effects. A multi-injector mounting structure is also provided, which reduces the overall installation volume, lowers costs, and facilitates maintenance.

[0006] In one or more embodiments, the second portion of the mounting hole includes a radial hole for communicating with the cooling channel, and also includes a deflection section for forming the flow channel.

[0007] In one or more embodiments, the extension direction of the flow channel is parallel to the axis of the first aperture segment.

[0008] In one or more embodiments, the cooling channel includes a first cooling channel and a second cooling channel, the cooling chamber includes an upper cooling chamber and a lower cooling chamber, the first cooling channel is connected to the lower cooling chamber, and the second cooling channel is disposed on the flow path of the first cooling channel and is used to divert the coolant in the first cooling channel.

[0009] In one or more embodiments, the first cooling channel is horizontally positioned near the outlet direction of the injector.

[0010] Another object of the present invention is to provide a multi-injector mounting structure for mounting multiple injectors to a cylinder head. The cylinder head includes mounting holes for the injectors to pass through. The mounting structure includes a pressure sleeve and a sealing sleeve. The pressure sleeve is fitted around the outer periphery of the injector and extends into the mounting hole, and includes an external threaded section. The sealing sleeve is fitted around the outer periphery of the injector. The mounting hole includes an internal threaded section and a stepped surface. The internal threaded section is used to connect with the external threaded section to apply a clamping force to the injector, and then transmits the clamping force to the sealing sleeve via the injector, so that the sealing sleeve abuts against the stepped surface. The stepped surface is axially symmetrically arranged and achieves large-area surface-to-surface contact with the end of the sealing sleeve.

[0011] In one or more embodiments, the mounting hole further includes a mounting hole positioning groove, the injector includes a positioning shoulder, the mounting structure further includes a positioning block, the positioning block includes a positioning channel and a positioning shoulder protruding on one side, the positioning channel is for the injector to pass through, the positioning shoulder is for cooperating with the mounting hole positioning groove, and the positioning block abuts against the positioning shoulder.

[0012] In one or more embodiments, the positioning shoulder fits into or is gapped with the mounting hole positioning groove.

[0013] In one or more embodiments, the mounting structure further includes a first washer disposed between the pressure sleeve and the positioning block.

[0014] In one or more embodiments, the pressure sleeve employs anti-loosening measures.

[0015] In one or more embodiments, some injectors also employ the aforementioned injector cooling structure.

[0016] The aforementioned injector cooling structure forms a small cooling circuit between the cooling chamber, cooling channel, and injector mounting hole, improving the cooling effect of the injector near the cylinder head's firing face and reducing the thermal load on the cylinder head and injector. It also ensures the cooling effect of the coolant on the firing face even when problems arise in multi-injector mounting structures, such as some injectors blocking the water passage of others or hindering the flow of coolant in the cooling chamber. Furthermore, the flow-guiding channel facilitates the cooling of the injector, improving the cooling effect on the cylinder head's firing face and injector while also ensuring the reliability of the seal between the injector and cylinder head. Attached Figure Description

[0017] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is an overall schematic diagram of one embodiment of the injector mounting structure.

[0019] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0020] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0021] Figure 4 This is an overall schematic diagram of one embodiment of the fuel injector cooling structure.

[0022] Figure 5 This is a top view of one embodiment of the mounting holes in the second part.

[0023] Figure 6 This is a top view of the structure of one embodiment of the offset segment.

[0024] Figure 7 This is a side cross-sectional view of one embodiment of the offset segment.

[0025] Figure 8 This is a schematic diagram of one embodiment of an injector.

[0026] Figure 9 This is a schematic diagram of one embodiment of the pressure sleeve.

[0027] Figure 10 This is a schematic diagram of one embodiment of the positioning block.

[0028] Figure 11 This is a structural diagram of the first part of the mounting holes.

[0029] Figure 12 This is a schematic diagram of one embodiment of the mounting hole positioning groove.

[0030] Symbol marking explanation

[0031] 1. Cylinder head

[0032] 2. Injectors

[0033] 3. Pressure sleeve

[0034] 4 First Washer

[0035] 5 positioning blocks

[0036] 6 Second Washer

[0037] 7. Sealing sleeve

[0038] 11 mounting holes

[0039] 12 Cooling Channels

[0040] 13 First part of the mounting holes

[0041] 14 Second Part Mounting Holes

[0042] 15. Diversion Channels

[0043] 16 Deviation Section

[0044] 18 Cooling chamber

[0045] 21. Locating shoulder

[0046] 31 polygonal segments

[0047] 32 External thread section

[0048] 51 Positioning Channels

[0049] 52 Positioning Shoulder

[0050] 113 Radial Hole

[0051] 114 Stepped surfaces

[0052] 115 Internal thread section

[0053] 116 Mounting Hole Positioning Slot

[0054] 121 First Cooling Channel

[0055] 122 Second Cooling Channel

[0056] 181 Lower Cooling Chamber

[0057] 182 Upper Cooling Chamber Detailed Implementation

[0058] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0059] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0060] Current injector mounting structures require both cooling and a good seal, making their design challenging. The injector cooling mounting structure disclosed herein is designed to address these issues.

[0061] Reference Figures 1 to 4 Understandably, the cylinder head 1 includes a cooling chamber 18 and a mounting hole 11 through which the fuel injector 2 passes. Coolant is disposed within the cooling chamber 18. The mounting hole 11 includes a first mounting hole 13 and a second mounting hole 14, with the second mounting hole 14 being closer to the firing face H than the first mounting hole 13. The first mounting hole 13 is exposed within the cooling chamber 18, thereby allowing the fuel injector 2 located in the first mounting hole 13 to contact the coolant.

[0062] The cylinder head 1 also includes a cooling channel 12, through which the second mounting hole 14 communicates with the cooling chamber 18. In some embodiments, the cooling chamber 18 includes an upper cooling chamber 182 and a lower cooling chamber 181. As those skilled in the art will know, the lower cooling chamber 181 is located on the side of the cylinder head closer to the fire face H, and the upper cooling chamber 182 is located above the lower cooling chamber 181, with liquid flowing out first from the lower cooling chamber 181. The cooling channel 12 includes a first cooling channel 121 and a second cooling channel 122. The first cooling channel 121 communicates with the lower cooling chamber 181, and the second cooling channel 122 communicates with the upper cooling chamber 182. The second cooling channel 122 is disposed on the flow path of the first cooling channel 121 and is used to divert the coolant from the first cooling channel 121 to the upper cooling chamber 182.

[0063] As in Figure 3 In the illustrated embodiment, the first cooling channel 121 and the second cooling channel 122 form a "Y" shape, with one end of the first cooling channel 121 communicating with the second mounting hole 14. Figure 5 As shown, the second mounting hole 14 includes a radial hole 113 for communicating with the cooling channel 12. One end of the first cooling channel 121 is connected to the radial hole 113 to allow coolant to flow into the second mounting hole 14.

[0064] The second mounting hole 14 also includes a flow channel 15, which guides the coolant to flow through the surface of the injector 2 located in the second mounting hole 14 and forms a cooling circuit in the cooling chamber 18, the cooling channel 12 and the second mounting hole 14 to achieve effective cooling of the injector 2.

[0065] Specifically, one embodiment of the flow channel 15 is described below. Figures 4 to 7 As shown, the second mounting hole 14 includes a deflection section 16 for forming a flow channel 15. (As indicated...) Figure 6 As shown, the second mounting hole 14 can be an irregular hole, a combination of a perfect circle and an eccentric circle. Those skilled in the art will understand that other shapes can also be used. The relatively eccentric offset section 16 defines the guide channel 15. A radial hole 113 is formed at the lower end of the guide channel 15, introducing coolant from the first cooling channel 121 into the guide channel 15. The radial hole 113 can be formed in the offset section 16, such as... Figure 7 As shown.

[0066] Preferably, the offset section 16 is located on the side of the injector 2 near the cooling channel 12, such as... Figure 6 As shown on the left and right sides, the holes can maintain a small gap or close contact with the injector 2, thereby achieving a small flow of coolant or no coolant flow.

[0067] Preferably, the extension direction of the offset section 16, that is, the extension direction of the guide channel 15, is parallel to the axis of the injector 2, so that the coolant flows into the upper cooling chamber 182 parallel to the injector 2. For other irregular structures, the guide channel 15 may not be parallel to the axis of the injector 2, as long as a cooling circuit can be formed and the minimum gap of the offset section 16 can allow the coolant to flow.

[0068] Furthermore, after the coolant flows from the first cooling channel 121 into the guide channel 15 through the radial hole 113, it is blocked by the stepped surface 114 at the lower part of the second mounting hole 14, preventing it from flowing downwards along the second mounting hole 14, thus limiting the flow direction of the coolant. Those skilled in the art will understand that any guide channel structure capable of unidirectionally connecting the first cooling channel 121 and the upper cooling chamber 182 can be applied to the injector mounting structure described in this disclosure, and is not limited to the above embodiments.

[0069] The flow channel 15 formed by the eccentric section 16 does not affect the contact surface between the lower part of the second mounting hole 14 and the sealing sleeve. Therefore, this cooling structure improves the cooling effect of the fire surface and the injector, while also ensuring the reliability of the sealing structure between the injector and the cylinder head.

[0070] In practical engineering, a higher coolant flow rate is required at the fire face H near the injector 2 outlet to provide sufficient cooling. Therefore, the coolant flowing out of the lower cooling chamber 181 flows out through the first cooling channel 121, is then diverted through the second cooling channel 122, and the remaining portion continues to flow towards the mounting hole 11, ensuring that the first cooling channel 121 is not restricted in terms of flow rate due to the smaller outlet at the mounting hole 11. The coolant flowing into the mounting hole 11 then enters the upper cooling chamber 182 along the guide channel, completing the flow path loop.

[0071] In some embodiments, the first cooling channel 121 is horizontally positioned near the outlet direction of the injector 2 to increase the cooling capacity at the fire surface H. Since the cooling channel 121 is close to the fire surface H side of the cylinder head 1 and connects the upper and lower cooling chambers, it enhances the cooling effect near the fire surface of the cylinder head 1 through perforated cooling, further reducing the temperature at the fire surface of the cylinder head 1. The first cooling channel 121 can also be configured with an inclined angle, as long as sufficient coolant flows through it.

[0072] Preferably, the flow diversion section of the second cooling channel 122 is located in the latter half of the flow of the first cooling channel 121, that is, on the side close to the mounting hole 11, so as to ensure sufficient cooling of the fire surface H.

[0073] In addition, in environments with multiple injectors installed, there are problems such as some injectors obstructing the flow of coolant in the cooling chamber and different injectors blocking each other's water passages. In this case, the above-mentioned cooling solution can still ensure the connection between the upper and lower cooling chambers and the cooling of the fire face and the injectors.

[0074] In addition, the current installation structure of fuel injectors on the cylinder head of domestic engines generally adopts the method of clamping with a pressure plate. The pressure plate is installed in the positioning groove of the fuel injector and then the pressure plate is clamped to the cylinder head by clamping bolts, thereby fixing the fuel injector.

[0075] This type of injector mounting structure typically requires additional threaded holes for clamping bolts, clamping plates, and related mounting parts in the cylinder head, increasing the manufacturing cost of the cylinder head. Furthermore, traditional clamping plates have a long distribution distance, occupying a significant portion of the cylinder surface. When applied to compact cylinder heads, this structure presents problems such as complex design leading to interference, uneven clamping force, and the risk of injector seal leakage, increasing the maintenance and repair costs of the engine cylinder unit. It is also unsuitable for multi-injector installations in compact configurations. Additionally, uneven clamping force applied to the injectors by the clamping plates can lead to leaks at the sealing surface and coolant flowing into the combustion chamber; therefore, uneven clamping force should be avoided as much as possible.

[0076] Therefore, this disclosure also proposes a multi-injector mounting structure that simplifies the mounting structure of each injector in environments with limited installation space, reduces costs, and ensures uniform distribution of the clamping force applied to the injectors.

[0077] The following embodiments use the component reference numerals and some content from the foregoing embodiments, wherein the same reference numerals are used to represent the same or similar components, and descriptions of the same technical content are selectively omitted. For explanations of the omitted parts, please refer to the foregoing embodiments; these will not be repeated in this embodiment.

[0078] Reference Figures 1 to 3 The multi-injector mounting structure is used to install multiple injectors 2 onto the cylinder head 1. The cylinder head 1 includes mounting holes 11 for the injectors 2 to pass through. The mounting structure includes a pressure sleeve 3 and a sealing sleeve 7. The pressure sleeve 3 is fitted around the outer periphery of the injector 2 and extends into a first portion of the mounting hole 13, including an externally threaded section 32. The sealing sleeve 7 is fitted around the outer periphery of the injector 2. The pressure sleeve 3 is located on the upper side of the injector 2, and the sealing sleeve 7 is located on the lower side of the injector 2, with a portion of the sealing sleeve 7 exposed within the upper cooling chamber 182.

[0079] The first part of the mounting hole 13 includes an internal thread section 115, and the second part of the mounting hole 14 includes a stepped surface 114. The internal thread section 115 is used to connect with the external thread section 32 to apply a clamping force to the injector 2, and then transmit the clamping force to the sealing sleeve 7 by means of the injector 2, so that the sealing sleeve 7 abuts against the stepped surface 114.

[0080] Preferably, the stepped surface 114 is symmetrically arranged and achieves large-area surface contact with the end of the sealing sleeve 7. The design size of the end contact area is based on the standard that the clamping force can be evenly distributed on each contact surface. By setting the upper and lower end face transmission, the contact surface is symmetrical, and the end face has a large-area contact, the preload force finally received by the sealing sleeve 7 is more uniform, ensuring that the sealing structure of the injector 2 can achieve a better sealing effect.

[0081] Compared to the pressure plate, the pressure sleeve 3 is smaller in size. Through the threaded connection between the external threaded section 32 and the internal thread 115 of the mounting hole 11, it effectively presses the injector firmly onto the cylinder head. Furthermore, the pressure sleeve 3 can have a polygonal section 31, which is generally hexagonal in structure, used for threading the pressure sleeve 3. However, to meet design and installation requirements, it can also be of any polygonal structure, such as... Figure 9 As shown.

[0082] After the injector is subjected to clamping force, it transmits the clamping force to the sealing sleeve 7. The end face of the sealing sleeve 7 contacts the end face of the stepped surface 114 of the second part of the mounting hole 14 to form a surface seal.

[0083] The injector 2 structure can be a design commonly used in injector products currently on the market, such as... Figure 8 As shown, it has a positioning shoulder 21, and the positioning shoulder 21 has a lower end face 211.

[0084] In some embodiments, refer to Figure 10 and Figure 11 It is understood that the first part of the mounting hole 13 also includes a mounting hole positioning groove 116. The mounting structure also includes a positioning block 5. The positioning block 5 includes a positioning channel 51 and a positioning shoulder 52 protruding on one side. The positioning channel 51 is used for the injector 2 to pass through, and the positioning shoulder 52 is used to cooperate with the mounting hole positioning groove 116. The positioning block 5 abuts against the positioning shaft shoulder 21.

[0085] When the injector is inserted into the mounting hole 11, the positioning shoulder 52 of the positioning block 5 should be positioned within the mounting hole positioning groove 116. Furthermore, depending on the dimensions of the positioning block 5 and the mounting hole positioning groove 116, the outer surface of the positioning shoulder 52 and the inner surface of the mounting hole positioning groove 116 can either be in close contact or maintain a certain gap. When the injector 2 is subjected to a circumferential force, the positioning block 5 and the mounting hole positioning groove 116 come into contact with each other and generate an interaction force, restricting the circumferential movement of the injector 2.

[0086] In some embodiments, the mounting structure further includes a first washer 4 disposed between the pressure sleeve 3 and the positioning block 5 for transmitting clamping force.

[0087] When installing the injector, first, in the order of pressure sleeve 3, first washer 4, and positioning block 5, fit the pressure sleeve 3, first washer 4, and positioning block 5 onto the outer circumference of the injector 2. First, insert the injector 2 into the inner hole of the pressure sleeve 3, at which point the external thread section 32 of the pressure sleeve 3 is at the bottom. Then, insert the injector 2 into the inner hole of the first washer 4, and finally, install the positioning groove 51 of the positioning block 5 onto the positioning shoulder 21 of the injector 2.

[0088] Next, insert the injector 2 into the second washer 6 and install it into the sealing sleeve 7. Finally, install the sealing sleeve 7 and the injector assembly into the injector mounting hole 11. At this point, the injector 2, the second washer 6, and the sealing sleeve 7 should be in contact with each other without any gaps.

[0089] Slowly tighten the pressure sleeve 3 so that the external thread section 32 of the pressure sleeve gradually coincides with the internal thread section 115 of the mounting hole, until the upper and lower end faces of the pressure sleeve 3, the first washer 4, and the positioning block 5 are in contact without any gaps. Then continue to tighten the pressure sleeve 3 according to the design requirements until the clamping force on the injector 2 reaches the design requirements.

[0090] The clamping force on the injector 2 is provided by the pressure sleeve 3, and is finally transmitted to the lower end face 211 of the injector 2's shoulder through the pressure sleeve 3, the first washer 4, and the positioning block 5, so that the injector 2 continues to press the second washer 6 and the sealing sleeve 7. The sealing sleeve 7 has a large surface contact with the stepped surface 114 of the injector mounting hole 11, which achieves the sealing of the injector 2, so that the clamping force can be evenly distributed on the contact surface.

[0091] To ensure that the pressure sleeve 3 can stably provide sufficient clamping force during long-term engine operation, certain anti-loosening measures need to be taken for the pressure sleeve 3 to prevent it from loosening and reducing the clamping force due to factors such as engine vibration. For example, in one embodiment, a minimum tightening torque is specified when installing the pressure sleeve 3. A larger tightening torque causes the pressure sleeve 3 to be subjected to a larger force, making it less prone to loosening. In another embodiment, a fixing nut with the opposite thread direction to the pressure sleeve 3 is added between the pressure sleeve 3 and the first washer 4. After the pressure sleeve 3 is tightened, since the pressure sleeve 3 and the fixing nut rotate in opposite directions, they restrain each other, achieving the purpose of preventing loosening. In yet another embodiment, thread-locking adhesive or other glue is applied to the external thread section 32 of the pressure sleeve to achieve the anti-loosening design.

[0092] The aforementioned multi-injector mounting structure achieves injector installation and fixation through pressure sleeves, clamping washers, and positioning blocks arranged within the injector mounting holes in the cylinder head, applying uniform clamping force to the injectors and overcoming the problem of large installation space requirements inherent in current injector mounting structures. This structure reduces the difficulty of cylinder head machining and structural layout, enabling the installation and fixation of multiple injectors in compact installation environments. Furthermore, this mounting structure is applicable to existing injector products without requiring modifications to the injector structure. Compared to pressure plate clamping structures achieving the same function, it not only reduces the required space for injector mounting but also ensures uniform clamping force on the injectors. More importantly, it improves injector installation and sealing reliability, ensuring safe engine operation. The injectors and sealing components within the mounting holes together form a sealing structure, which achieves a good sealing effect under clamping force. This structure is easy to manufacture, requires no additional structural space when installing the injector, and the clamping force on the injector is uniform after installation, ensuring the injector seal. It helps to solve the technical problems caused by insufficient space for injector installation and uneven injector clamping force in compact structural environments in the prior art.

[0093] In addition, to overcome the problem of the difficulty in designing the cooling structure, some injectors in the multi-injector structure can also adopt the aforementioned cooling installation structure. This arrangement takes into account both the cooling requirements of the injectors and the reliability of the injector sealing structure, meets the cooling requirements of the cylinder head and multiple injectors, and effectively improves the cooling effect of the injectors.

[0094] It should be noted that the use of terms such as "first" and "second" to define the components in the foregoing description is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0095] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0096] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A fuel injector cooling mounting structure for mounting and cooling a fuel injector (2) to a cylinder head (1), the cylinder head (1) including a mounting hole (11) for the fuel injector (2) to pass through and a cooling chamber (18) containing coolant, characterized in that, The cylinder head (1) also includes a cooling passage (12). The mounting hole (11) includes a first mounting hole (13) and a second mounting hole (14). The first mounting hole (13) is exposed inside the cooling cavity (18), and the second mounting hole (14) is connected to the cooling cavity (18) through the cooling channel (12). The second mounting hole (14) further includes a flow guide channel (15) for guiding coolant to flow through the surface of the injector (2) located in the second mounting hole (14) and forming a cooling circuit in the cooling chamber (18), the cooling channel (12) and the second mounting hole (14); the second mounting hole (14) includes a radial hole (113) for communicating with the cooling channel (12), and also includes a deflection section (16) for forming the flow guide channel (15), the deflection section (16) is disposed on the side of the injector close to the cooling channel, and the other side maintains a small gap contact or close contact with the injector; The cooling channel (12) includes a first cooling channel (121) and a second cooling channel (122). The cooling chamber (18) includes an upper cooling chamber (182) and a lower cooling chamber (181). The first cooling channel (121) is connected to the lower cooling chamber (181). The second cooling channel (122) is connected to the upper cooling chamber (182) and the first cooling channel (121) and is used to divert the coolant in the first cooling channel (121).

2. The injector cooling mounting structure as described in claim 1, characterized in that, The extension direction of the flow channel (15) is parallel to the axis of the injector (2).

3. The injector cooling mounting structure as described in claim 1, characterized in that, The first cooling channel (121) is horizontally positioned near the outlet direction of the injector (2).

4. A multi-injector mounting structure for mounting multiple injectors (2) to a cylinder head (1), the cylinder head (1) including mounting holes (11) for the injectors (2) to pass through, characterized in that, Including the injector cooling mounting structure as described in any one of claims 1-3, the mounting structure comprising: A pressure sleeve (3) is fitted around the outer periphery of the injector (2) and extends into the mounting hole (11), including an external thread section (32). A sealing sleeve (7) is used to be fitted around the outer periphery of the injector (2); The mounting hole (11) includes an internal thread section (115) and a stepped surface (114). The internal thread section (115) is used to connect with the external thread section (32) to apply a clamping force to the injector (2), and then transmits the clamping force to the sealing sleeve (7) through the injector (2), so that the sealing sleeve (7) abuts against the stepped surface (114). The stepped surface (114) and the end of the sealing sleeve (7) achieve large-area surface-to-surface contact.

5. The multi-injector mounting structure as described in claim 4, characterized in that, The mounting hole (11) also includes a mounting hole positioning groove (116), the injector (2) includes a positioning shoulder (21), and the mounting structure also includes a positioning block (5). The positioning block (5) includes a positioning channel (51) and a positioning shoulder (52) protruding on one side. The positioning channel (51) is used for the injector (2) to pass through, and the positioning shoulder (52) is used to cooperate with the mounting hole positioning groove (116). The positioning block (5) abuts against the positioning shoulder (21).

6. The multi-injector mounting structure as described in claim 5, characterized in that, The positioning shoulder (52) fits into or has a gap with the mounting hole positioning groove (116).

7. The multi-injector mounting structure as described in claim 5, characterized in that, The mounting structure also includes a first washer (4) disposed between the pressure sleeve (3) and the positioning block (5).

8. The multi-injector mounting structure as described in claim 5, characterized in that, The pressure sleeve (3) is equipped with anti-loosening measures.

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