Engine overheating protection device and engine system
By using the phase change characteristics of solid paraffin in the engine overheating protection device, the valve core is pushed to seal the through holes of the oil passage, which solves the problem that pure mechanical fuel-type engines cannot effectively overheat protection, and realizes engine overheating protection without electronic control.
Patent Information
- Application Number
- CN202421724895.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-19
AI Technical Summary
The prior art cannot effectively realize overheating protection of pure mechanical fuel engines.
An engine overheating protection device is designed, which utilizes the phase change characteristics of solid paraffin. When the engine temperature rises, the paraffin melts and expands, pushing the valve core to block the oil passage through holes, thereby preventing fuel supply and achieving overheating protection.
Without the need for electronic control units and temperature sensors to cooperate with control logic, the engine can be effectively protected from overheating damage and is suitable for pure mechanical fuel-type engines.
Smart Images
Figure CN222782727U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, in particular to an engine overheat protection device and an engine system. Background Art
[0002] The normal operating temperature of the engine is usually within a relatively narrow temperature range, which is determined by the engine design and material tolerance. The engine cooling system is designed to maintain this temperature range to ensure the most efficient energy conversion and the lowest pollutant emissions; when the engine temperature exceeds its designed operating range, it may cause major engine failures such as cylinder scuffing and bearing wear; therefore, it is necessary to add an engine overheating protection system to ensure that the engine can promptly alarm and reduce power output or even emergency stop when the allowable operating temperature exceeds the allowable operating temperature to avoid engine damage.
[0003] In the prior art, electronically controlled engines can protect the engine from overheating by means of an electronic control unit and a temperature sensor in coordination with control logic; however, for purely mechanical fuel-powered engines, this electronic control system cannot be applied.
[0004] Therefore, how to achieve overheat protection for a purely mechanical fuel-fired engine has become a technical problem in the art that needs to be solved urgently. Utility Model Content
[0005] The purpose of the utility model is to at least solve the technical problem of how to achieve overheat protection for a purely mechanical fuel-fired engine. This purpose is achieved through the following technical solutions:
[0006] In a first aspect, the utility model proposes an engine overheat protection device, which is installed on an oil supply pipeline of an engine system. The engine overheat protection device comprises: a housing, comprising a first shell and a second shell, the first shell having a first cavity, solid paraffin being arranged in the first cavity, and the first cavity having a first opening; the second shell being connected to the first shell, the second shell having a second cavity, the second cavity having a second opening, the second cavity being communicated with the first cavity through the second opening and the first opening, and an oil passage through hole being arranged at one end of the second cavity away from the first cavity; and a valve core, the valve core being arranged through the first opening and the second opening, the first end of the valve core being located in the first cavity, the second end of the valve core being located in the second cavity, the second end of the valve core being used to block the oil passage through hole, the valve core being able to move along the extension direction of the second cavity, and the valve core having a first state and a second state; when the valve core is in the first state, there is a gap between the second end of the valve core and the oil passage through hole along the extension direction of the second cavity, and the oil passage through hole is in a connected state; when the valve core is in the second state, the second end of the valve core blocks the oil passage through hole.
[0007] The working principle of this engine overheat protection device is as follows: when the engine system generates a high temperature during operation, since solid paraffin is provided in the first cavity, according to the phase change characteristics of paraffin, the paraffin will gradually melt as the ambient temperature rises, and the volume of the paraffin will increase accordingly, until the temperature rises to the melting point of the paraffin, and the paraffin gradually becomes liquid. In other words, when the temperature of the engine system rises, the volume occupied by the paraffin in the first cavity becomes larger and larger, thereby occupying the space of the first end of the valve core in the first cavity, and then squeezing the valve core toward the oil channel through hole along the extension direction of the second cavity, until the valve core is in the second state, that is, the first end of the valve core blocks the oil channel through hole, so that the oil supply pipeline of the engine system cannot supply oil to the engine body, thereby achieving the overheat protection effect of the engine system.
[0008] In some embodiments of the utility model, the valve core, the first cavity and the second cavity all extend along the first direction, the valve core includes a first core and a second core connected to the first core, and a limiting protrusion is provided between the first core and the second core, and the limiting protrusion is used to prevent the second core from extending into the first cavity.
[0009] In some embodiments of the utility model, the second cavity includes a guide cavity and a blocking cavity, the guide cavity and the blocking cavity are arranged along the first direction, the inner diameter of the guide cavity is larger than the inner diameter of the blocking cavity, the limiting protrusion is also used to prevent the first core from extending into the blocking cavity, and the oil channel through hole is set in the blocking cavity.
[0010] In some embodiments of the utility model, the engine overheat protection device also includes a spring, which is sleeved on the outer wall of the second core, extends along the first direction, the first end of the spring abuts against the limiting protrusion, and the second end of the spring abuts against the inner wall of the guide cavity.
[0011] In some embodiments of the utility model, the engine overheating protection device also includes an alarm component, which includes: a normally closed switch, including a first contact and a second contact, the first contact is installed on the outer wall of the first shell near one end of the second shell, and the second contact is installed on the outer wall of the limiting protrusion; and an alarm unit, which is connected to the normally closed switch signal, and the alarm unit is used to issue an alarm when the first contact and the second contact are disconnected.
[0012] In some embodiments of the present invention, the engine overheat protection device further includes a sealing mechanism, and the sealing mechanism is used to seal the gap between the valve core and the housing.
[0013] In some embodiments of the present invention, the sealing mechanism includes a first sealing ring, which is sleeved on the outer wall of the first core and located between the outer wall of the first core and the inner wall of the first opening along the radial direction of the first core.
[0014] In some embodiments of the utility model, the sealing mechanism includes a second sealing ring, which is sleeved on the outer wall of the second core, and along the radial direction of the second core, the first sealing ring is located between the outer wall of the second core and the inner wall of the blocking cavity.
[0015] In some embodiments of the present invention, the first shell has a first mounting portion, the second shell has a second mounting portion, and the first mounting portion is detachably connected to the second mounting portion.
[0016] In a second aspect, the utility model proposes an engine system, which includes an engine body, an oil supply pipeline and any one of the above-mentioned engine overheating protection devices, and the engine overheating protection device is connected to the oil supply pipeline through an oil channel through-hole.
[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0019] Figure 1 A schematic diagram of the structure of an engine overheat protection device provided by an embodiment of the utility model;
[0020] Figure 2 An exploded diagram of an engine overheat protection device provided by an embodiment of the utility model;
[0021] Figure 3 A cross-sectional view of an engine overheat protection device provided in an embodiment of the utility model.
[0022] The reference numerals are as follows:
[0023] 100. Engine overheat protection device;
[0024] 1. first housing; 11. first cavity; 111. first opening; 12. first mounting portion;
[0025] 2. second housing; 21. second cavity; 211. guide cavity; 2111. second opening; 212. blocking cavity; 2121. oil channel through hole; 22. second mounting portion;
[0026] 3. Valve core; 31. First core; 32. Second core; 33. Limiting protrusion;
[0027] 4. Spring;
[0028] 5. Normally closed switch; 51. First contact; 52. Second contact;
[0029] 6. The first sealing ring;
[0030] 7. Second sealing ring;
[0031] 8. Screws. DETAILED DESCRIPTION
[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0033] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.
[0034] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.
[0035] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.
[0036] Figure 1 A schematic diagram of the structure of an engine overheat protection device provided by an embodiment of the utility model; Figure 2 An exploded diagram of an engine overheat protection device provided by an embodiment of the utility model; Figure 3 A cross-sectional view of an engine overheat protection device provided by an embodiment of the utility model. Figure 1-Figure 3 The embodiment of the utility model provides an engine overheat protection device 100, which is installed in the oil supply pipeline of the engine system. The engine overheat protection device 100 includes: a shell, including a first shell 1 and a second shell 2, the first shell 1 has a first cavity 11, the first cavity 11 is provided with solid paraffin, and the first cavity 11 has a first opening 111; the second shell 2 is connected to the first shell 1, the second shell 2 has a second cavity 21, the second cavity 21 has a second opening 2111, the second cavity 21 is connected to the first cavity 11 through the second opening 2111 and the first opening 111, and the second cavity 21 is provided with an oil passage at one end away from the first cavity 11 through hole 2121; and the valve core 3, the valve core 3 is penetrated by the first opening 111 and the second opening 2111, the first end of the valve core 3 is located in the first cavity 11, the second end of the valve core 3 is located in the second cavity 21, the second end of the valve core 3 is used to block the oil passage through hole 2121, the valve core 3 can move along the extension direction of the second cavity 21, the valve core 3 has a first state and a second state; when the valve core 3 is in the first state, along the extension direction of the second cavity 21, there is a gap between the second end of the valve core 3 and the oil passage through hole 2121, and the oil passage through hole 2121 is in a connected state; when the valve core 3 is in the second state, the second end of the valve core 3 blocks the oil passage through hole 2121.
[0037] In this embodiment, the working principle of the engine overheat protection device 100 is as follows: when the engine runs at a high temperature, since solid paraffin is provided in the first cavity 11, according to the phase change characteristics of the paraffin, the paraffin will gradually melt as the ambient temperature rises, and the volume of the paraffin will also increase accordingly, until the temperature rises to the melting point of the paraffin (generally 50°C-60°C), the paraffin will gradually become liquid.
[0038] That is to say, before the engine system is started, the valve core 3 is in the first state, that is, the oil channel hole 2121 is in a connected state, so as to ensure that the oil supply pipeline in the engine system can supply oil to the engine body; as the engine system runs, when the temperature of the engine system rises, the volume occupied by the paraffin in the first cavity 11 becomes larger and larger, thereby occupying the space of the first end of the valve core 3 in the first cavity 11, and then squeezing the valve core 3 toward the oil channel hole 2121 along the extension direction of the second cavity 21 until the valve core 3 is in the second state, that is, the second end of the valve core 3 blocks the oil channel hole 2121.
[0039] It is easy to understand that when the valve core 3 switches from the first state to the second state, the second end of the valve core 3 gradually moves toward the oil channel through hole 2121, that is, the opening of the oil channel through hole 2121 is gradually blocked by the second end of the valve core 3 and gradually decreases, so as to gradually reduce the oil intake of the engine body, thereby reducing the work done by the engine; if the temperature is still not reduced to the standard temperature range of the engine operation during this process, the paraffin will continue to expand, and the valve core 3 will continue to move toward the oil channel through hole 2121 along the extension direction of the second cavity 21, and finally the valve core 3 will switch to the second state, that is, the second end of the valve core 3 completely blocks the oil channel through hole 2121, so that the oil supply pipeline of the engine system cannot supply oil to the engine, thereby achieving an overheating protection effect on the engine system.
[0040] Therefore, this engine overheat protection device 100, based on the characteristics of paraffin and the special structure of the shell and valve core 3, can also play a role in protecting the engine from overheating without the need for an electronic control unit and a temperature sensor to cooperate with the control logic, and is suitable for pure mechanical fuel engines.
[0041] In addition, it should be noted that in order to improve the thermal conductivity of paraffin wax, copper powder or aluminum powder may be added to the solid paraffin wax.
[0042] refer to Figure 2 and Figure 3 According to an optional embodiment of the utility model, the valve core 3, the first cavity 11 and the second cavity 21 all extend along the first direction, the valve core 3 includes a first core 31 and a second core 32 connected to the first core 31, and a limiting protrusion 33 is provided between the first core 31 and the second core 32, and the limiting protrusion 33 is used to prevent the second core 32 from extending into the first cavity 11.
[0043] In this embodiment, the limiting protrusion 33 can protrude relative to the outer wall of the first core 31, and the positive projection of the limiting protrusion 33 on the first shell 1 can completely cover the first opening 111. That is to say, due to the existence of the limiting protrusion 33, the second core 32 of the valve core 3 cannot pass through the first opening 111, thereby preventing the second core 32 from extending into the first cavity 11.
[0044] Therefore, the setting of the limiting protrusion 33 has a simple structure and convenient process, and plays a good limiting role on the valve core 3 in the first direction.
[0045] like Figure 3 As shown, according to an optional embodiment of the utility model, the second cavity 21 includes a guide cavity 211 and a blocking cavity 212, the guide cavity 211 and the blocking cavity 212 are arranged along the first direction, the inner diameter of the guide cavity 211 is larger than the inner diameter of the blocking cavity 212, the limiting protrusion 33 is also used to prevent the first core 31 from extending into the blocking cavity 212, and the oil channel through hole 2121 is set in the blocking cavity 212.
[0046] In this embodiment, similarly, the limiting protrusion 33 can protrude relative to the outer wall of the second core 32, and the orthographic projection of the limiting protrusion 33 on the second shell 2 can completely cover the orthographic projection of the inner wall of the blocking cavity 212 on the second shell 2. That is to say, due to the existence of the limiting protrusion 33, the first core 31 of the valve core 3 cannot extend into the blocking cavity 212, thereby achieving the purpose of preventing the first core 31 from extending into the blocking cavity 212.
[0047] Therefore, the limiting protrusion 33 combined with the setting of the blocking cavity 212 and the guide cavity 211 plays a limiting role in the movement of the valve core 3 on both sides along the first direction.
[0048] like Figure 2 and Figure 3 As shown, according to an optional embodiment of the utility model, the engine overheat protection device 100 also includes a spring 4, which is sleeved on the outer wall of the second core 32, and extends along the first direction. The first end of the spring 4 abuts against the limiting protrusion 33, and the second end of the spring 4 abuts against the inner wall of the guide cavity 211.
[0049] In this embodiment, due to the bumps of the vehicle during operation and the effect of the gravity of the valve core 3 itself, it is difficult to ensure that the valve core 3 is in the first state when the temperature of the engine system is not too high. The valve core 3 has the risk of moving along the first direction toward the oil passage hole 2121, causing the oil passage hole 2121 to be blocked or partially blocked, thereby affecting the normal operation of the engine system. Therefore, in this embodiment, a spring 4 is provided, and the two ends of the spring 4 are respectively abutted against the limiting protrusion 33 and the inner wall of the guide cavity 211 to provide an initial support force for the valve core 3, thereby preventing the valve core 3 from moving along the first direction toward the oil passage hole 2121, ensuring that the engine system can operate normally; when the temperature of the engine system rises, under the effect of the expansion of paraffin, the elastic force of the spring 4 is overcome to make the valve core 3 move along the first direction toward the oil passage hole 2121.
[0050] In addition, when the temperature of the engine system drops to a normal temperature range, the volume of the paraffin decreases. At this time, the compression force of the spring 4 is converted into elastic force to gradually reset the valve core 3 (i.e., the valve core 3 moves along the first direction toward the end away from the oil channel through hole 2121).
[0051] It should be noted that the valve core 3 does not necessarily return to the initial position in the end. It can realize the conversion of the oil channel through hole 2121 from a completely blocked state to a state where the oil channel can flow, thereby realizing the continued oil supply to the engine body and realizing the normal operation of the engine system.
[0052] Continue to refer Figure 2 and Figure 3 According to an optional embodiment of the utility model, the engine overheat protection device 100 also includes an alarm component, which includes: a normally closed switch 5, including a first contact 51 and a second contact 52, the first contact 51 is installed on the outer wall of the first shell 1 close to the second shell 2, and the second contact 52 is installed on the outer wall of the limiting protrusion 33; and an alarm unit, which is connected to the signal of the normally closed switch 5, and the alarm unit is used to issue an alarm when the first contact 51 and the second contact 52 are disconnected.
[0053] In this embodiment, before the engine system is started, the first contact 51 is in contact with the second contact 52, and the alarm unit does not receive the alarm signal; as the engine system runs, when the temperature of the engine system rises, according to the above analysis, the valve core 3 will eventually be squeezed toward the oil channel through hole 2121 along the first direction. Since the first contact 51 is installed on the outer wall of the first shell 1 close to the second shell 2, and the second contact 52 is installed on the outer wall of the limiting protrusion 33, the second contact 52 will be disconnected from the first contact 51 when the valve core 3 moves. At this time, the alarm unit receives the signal and issues an alarm to remind the driver that the engine system temperature is too high at this time, and the driver can then take effective measures to deal with it.
[0054] Therefore, the setting of the alarm component can promptly remind the driver when the engine system temperature is too high, thereby effectively reducing the impact of the high engine system temperature on the engine system and even the entire vehicle.
[0055] In addition, the alarm unit can be an indicator light, a buzzer, etc., or a combination of the two, so as to remind the driver visually and audibly at the same time, further improving the warning effect. The specific type and number of alarm units can be determined according to actual needs and are not specifically limited.
[0056] According to an optional embodiment of the present utility model, the engine overheat protection device 100 further includes a sealing mechanism, and the sealing mechanism is used to seal the gap between the valve core 3 and the housing.
[0057] In this embodiment, the sealing mechanism can prevent the oil supply pipeline from leaking oil into the engine overheat protection device 100.
[0058] like Figure 2 and Figure 3 As shown, specifically, according to an optional embodiment of the utility model, the sealing mechanism includes a first sealing ring 6, which is sleeved on the outer wall of the first core 31, and along the radial direction of the first core 31, the first sealing ring 6 is located between the outer wall of the first core 31 and the inner wall of the first opening 111.
[0059] In addition, the sealing mechanism may further include a second sealing ring 7 , which is sleeved on the outer wall of the second core 32 , and along the radial direction of the second core 32 , the first sealing ring 6 is located between the outer wall of the second core 32 and the inner wall of the blocking cavity 212 .
[0060] In this embodiment, the first sealing ring 6 and the second sealing ring 7 are arranged with simple structure and convenient installation, and adopt a double-layer protection method to effectively prevent fuel from entering the inner shell of the engine overheat protection device 100.
[0061] refer to Figure 1-Figure 3 According to an optional embodiment of the present utility model, the first shell 1 has a first mounting portion 12, the second shell 2 has a second mounting portion 22, and the first mounting portion 12 and the second mounting portion 22 are detachably connected.
[0062] In this embodiment, in order to facilitate the assembly of the valve core 3 and possible subsequent maintenance and replacement, the first housing 1 and the second housing 2 are configured to be detachably connected.
[0063] For example, a first threaded hole may be provided on the first mounting portion 12 , and a second threaded hole corresponding to the first threaded hole may be provided on the second mounting portion 22 , and the first shell 1 and the second shell 2 may be detachably connected by means of screws 8 .
[0064] It is easy to understand that a plurality of screws 8 can be provided, that is, a plurality of first threaded holes and a plurality of second threaded holes are provided one by one, and a plurality of screws 8 can be evenly spaced and distributed on the housing. A plurality of screws 8 can further improve the connection stability between the first housing 1 and the second housing 2, and can further ensure the sealing between the first housing 1 and the second housing 2.
[0065] The embodiment of the utility model further provides an engine system, which includes an engine body, an oil supply pipeline and any one of the above-mentioned engine overheating protection devices 100 , and the engine overheating protection device 100 is connected to the oil supply pipeline through an oil channel through hole 2121 .
[0066] In this embodiment, the beneficial effects of the engine system are the same as those of any of the above-mentioned engine overheat protection devices 100, which can protect the engine from overheating without the need for an electronic control unit and a temperature sensor to cooperate with the control logic, and are suitable for purely mechanical fuel-fired engines. The specific principle is referred to the above analysis and will not be repeated here.
[0067] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. An engine overheat protection device (100), installed in an oil supply pipeline of an engine system, characterized in that: include: A housing, comprising a first shell (1) and a second shell (2), the first shell (1) having a first cavity (11), solid paraffin being arranged in the first cavity (11), and the first cavity (11) having a first opening (111); the second shell (2) being connected to the first shell (1), the second shell (2) having a second cavity (21), the second cavity (21) having a second opening (2111), the second cavity (21) being connected to the first cavity (11) via the second opening (2111) and the first opening (111), and an oil passage hole (2121) being arranged at one end of the second cavity (21) away from the first cavity (11); and a valve core (3), the valve core (3) being inserted through the first opening (111) and the second opening (2111), the first end of the valve core (3) being located in the first cavity (11), the second end of the valve core (3) being located in the second cavity (21), the second end of the valve core (3) being used to block the oil passage through hole (2121), The valve core (3) is capable of moving along the extension direction of the second cavity (21), and the valve core (3) has a first state and a second state; when the valve core (3) is in the first state, along the extension direction of the second cavity (21), there is a gap between the second end of the valve core (3) and the oil passage hole (2121), and the oil passage hole (2121) is in a connected state; when the valve core (3) is in the second state, the second end of the valve core (3) blocks the oil passage hole (2121).
2. The engine overheat protection device (100) according to claim 1, characterized in that: The valve core (3), the first cavity (11) and the second cavity (21) all extend in a first direction; the valve core (3) comprises a first core (31) and a second core (32) connected to the first core (31); a limiting protrusion (33) is provided between the first core (31) and the second core (32); the limiting protrusion (33) is used to prevent the second core (32) from extending into the first cavity (11).
3. The engine overheat protection device (100) according to claim 2, characterized in that: The second cavity (21) comprises a guide cavity (211) and a blocking cavity (212); the guide cavity (211) and the blocking cavity (212) are arranged along the first direction; the inner diameter of the guide cavity (211) is larger than the inner diameter of the blocking cavity (212); the limiting protrusion (33) is also used to prevent the first core (31) from extending into the blocking cavity (212); and the oil channel through hole (2121) is arranged in the blocking cavity (212).
4. The engine overheat protection device (100) according to claim 3, characterized in that: The engine overheat protection device (100) further comprises a spring (4), wherein the spring (4) is sleeved on the outer wall of the second core (32), the spring (4) extends along the first direction, the first end of the spring (4) abuts against the limiting protrusion (33), and the second end of the spring (4) abuts against the inner wall of the guide cavity (211).
5. The engine overheat protection device (100) according to claim 2, characterized in that: The engine overheat protection device (100) further comprises an alarm component, wherein the alarm component comprises: A normally closed switch (5), comprising a first contact (51) and a second contact (52), wherein the first contact (51) is mounted on an outer wall of the first housing (1) close to one end of the second housing (2), and the second contact (52) is mounted on an outer wall of the limiting protrusion (33); and An alarm unit is connected to the normally closed switch (5) by a signal, and is used to issue an alarm when the first contact (51) and the second contact (52) are disconnected.
6. The engine overheat protection device (100) according to claim 3, characterized in that: The engine overheat protection device (100) further comprises a sealing mechanism, which is used to seal the gap between the valve core (3) and the housing.
7. The engine overheat protection device (100) according to claim 6, characterized in that: The sealing mechanism comprises a first sealing ring (6), the first sealing ring (6) being sleeved on the outer wall of the first core (31), and along the radial direction of the first core (31), the first sealing ring (6) is located between the outer wall of the first core (31) and the inner wall of the first opening (111).
8. The engine overheat protection device (100) according to claim 7, characterized in that: The sealing mechanism comprises a second sealing ring (7), the second sealing ring (7) being sleeved on the outer wall of the second core (32), and along the radial direction of the second core (32), the first sealing ring (6) is located between the outer wall of the second core (32) and the inner wall of the blocking cavity (212).
9. The engine overheat protection device (100) according to any one of claims 1 to 8, characterized in that: The first shell (1) has a first mounting portion (12), the second shell (2) has a second mounting portion (22), and the first mounting portion (12) and the second mounting portion (22) are detachably connected.
10. An engine system, characterized in that: It comprises an engine body, an oil supply pipeline and an engine overheating protection device (100) as claimed in any one of claims 1 to 9, wherein the engine overheating protection device (100) is connected to the oil supply pipeline through the oil channel through hole (2121).