Fuel pump assembly and fuel tank system

Abstract

The utility model relates to a fuel pump assembly and an oil tank system, a fuel pump is arranged in an oil tank, the fuel pump assembly comprises a base frame, a pump body, an oil supply pipeline and a temperature control pipeline, and the pump body is arranged on the base frame; the oil supply pipeline is arranged on the base frame, is suitable for communicating the oil tank with external equipment, and is driven by the pump body to convey a medium in the oil tank to the external equipment; the temperature control pipeline comprises a water inlet pipeline, a temperature adjusting cavity and a water return pipeline which are communicated with one another, the oil supply pipeline is arranged in the temperature adjusting cavity in a penetrating mode, the temperature control pipeline is connected with external temperature control equipment, and under driving of the external temperature control equipment, a temperature adjusting medium flows into the temperature adjusting cavity through the water inlet pipeline and then flows out through the water return pipeline. And the temperature of the medium in the oil supply pipeline is changed under the action of the temperature adjusting medium. The design that the oil supply pipeline is arranged in the temperature adjusting cavity can optimize the heat exchange efficiency of the temperature control pipeline, the accuracy and the stability of temperature adjusting are improved, and therefore the performance and the reliability of the fuel pump assembly are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a fuel pump assembly and a fuel tank system. Background Art

[0002] With the increase in the mileage of diesel commercial vehicles and the demand for timeliness, the fuel tank capacity is generally larger. However, due to the limitations of the vehicle layout, the fuel tank capacity cannot be increased indefinitely. In order to meet the requirements of long-distance transportation and high timeliness, engineers began to develop dual-tank models to increase the fuel reserve capacity and extend the vehicle's mileage.

[0003] In northern regions, diesel vehicles face a problem when used in winter: due to the influence of low temperatures, the use of ordinary low-grade fuel may lead to problems such as reduced engine performance and difficulty starting. To solve this problem, different manufacturers have developed water-heated fuel systems. Through this system, the fuel can be heated to a suitable temperature before entering the engine, thereby ensuring the normal operation of the engine in a low-temperature environment. This system not only improves the reliability and stability of the vehicle in cold climates, but also reduces operating costs because lower-grade fuel can be used at a lower price.

[0004] However, based on the needs of long-distance transportation of commercial vehicles and the use conditions in the low-temperature environment in northern winter, the design of the fuel pump assembly and fuel tank must take into account the increase in fuel reserve capacity and the adaptability of fuel in low-temperature environments. The design of the existing structure of the fuel pump assembly and fuel tank cannot adapt to this, so it is difficult to meet the needs of commercial vehicles. Utility Model Content

[0005] Based on this, it is necessary to provide a fuel pump assembly and a fuel tank to address the above problems.

[0006] The present application provides a fuel pump assembly, which is arranged in a fuel tank, and includes a base frame, a pump body, a fuel supply pipeline and a temperature control pipeline, wherein the pump body is arranged on the base frame; the fuel supply pipeline is arranged on the base frame, and the fuel supply pipeline is suitable for connecting the fuel tank with an external device, and transporting the medium in the fuel tank to the external device under the drive of the pump body; the temperature control pipeline includes an inlet pipeline, a temperature regulating chamber and a return pipeline that are interconnected, the fuel supply pipeline is passed through the temperature regulating chamber, and the temperature control pipeline is connected to an external temperature control device. Under the drive of the external temperature control device, the temperature regulating medium flows into the temperature regulating chamber through the inlet pipeline and then flows out through the return pipeline, and the medium in the fuel supply pipeline changes temperature under the action of the temperature regulating medium.

[0007] In one of the embodiments, it further includes a shell, which is sleeved on the outer sides of the ends of the oil supply pipeline and the temperature control pipeline, the pump body is arranged in the shell, and the shell is connected to the base frame.

[0008] In one of the embodiments, a filter element is further included. The filter element is detachably disposed in the oil supply pipeline and is suitable for filtering the medium in the oil supply pipeline.

[0009] In one of the embodiments, a first detection member is further included, one end of which is arranged on the housing, and the other end of which extends into the oil tank, and is suitable for detecting the liquid level of the medium in the oil tank.

[0010] In one of the embodiments, a connecting pipe is further included, wherein a first end of the connecting pipe is arranged on the shell, and a second end of the connecting pipe is arranged on a side of the shell located inside the oil tank, and the connecting pipe is suitable for connecting the medium inside and outside the oil tank to balance the internal pressure of the oil tank to atmospheric pressure.

[0011] In one embodiment, the connecting pipe further includes a blocking piece, which is disposed at the second end of the connecting pipe; in a vertical state, the connecting pipe remains connected, and in a tilted state, the blocking piece blocks the second end under the action of gravity, and the connecting pipe is closed.

[0012] In one embodiment, the temperature control pipeline is connected to the engine, and the temperature control medium is the coolant of the engine.

[0013] The present application also provides a fuel tank system, comprising the above-mentioned fuel pump assembly, a main fuel tank and a subsidiary fuel tank, wherein the fuel pump assembly is arranged in the subsidiary fuel tank, and a fuel supply pipeline connects the subsidiary fuel tank and the main fuel tank.

[0014] In one of the embodiments, it further includes a control component and a second detection component disposed in the main oil tank, wherein the second detection component is suitable for detecting the medium liquid level in the main oil tank.

[0015] In one embodiment, the control component reads the data of the second detection component. When the liquid level in the main oil tank is lower than a preset minimum liquid level, the control component controls the pump body to start and supply oil to the main oil tank; when the liquid level in the main oil tank reaches a preset maximum liquid level, the control component controls the pump body to stop supplying oil; when the liquid level in the auxiliary oil tank is lower than the minimum liquid level setting value, the control component controls the pump body to stop working.

[0016] The pump body of the above-mentioned fuel pump assembly can effectively drive and deliver the medium in the fuel tank to the external device. This structural design makes the fuel supply process more stable and reliable, can meet the needs of the external device for the medium, and improves the efficiency of the fuel system. The temperature control pipeline includes a water inlet pipeline, a temperature regulating chamber and a water return pipeline. By connecting with an external temperature control device, the temperature of the medium in the fuel supply pipeline is controlled. The water inlet pipeline is responsible for introducing the temperature regulating medium into the temperature regulating chamber. The medium in the temperature regulating chamber exchanges heat with the medium in the fuel supply pipeline to achieve temperature regulation. The water return pipeline re-leads out the regulated medium. This temperature control design helps to ensure that the medium in the fuel supply pipeline can maintain the required temperature under different working conditions, improves the fluidity and stability of the medium, and helps to improve the combustion efficiency of the fuel and engine performance.

[0017] The above-mentioned fuel tank system and dual fuel tank design can increase the vehicle's mileage and improve the reliability of fuel supply. When the fuel in the main tank is consumed, the system controls the fuel pump assembly to transfer the fuel in the auxiliary tank to the main tank to ensure the continuous operation of the vehicle. The fuel pump assembly is installed in the auxiliary tank. This design helps to reduce the load and vibration of the pump body and improve the stability and life of the fuel pump. At the same time, arranging the fuel pump assembly in the auxiliary tank can also save space in the main tank, making the main tank more flexible and can be used to install other vehicle components or increase fuel capacity. By arranging the fuel pump assembly in the auxiliary tank and connecting the fuel supply lines of the main tank and the auxiliary tank, a flexible and reliable fuel tank system is provided, which not only meets the fuel supply needs, but also improves the performance and ease of use of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic diagram of the overall structure of a fuel pump assembly provided in one embodiment of the present application;

[0019] FIG2 is a schematic diagram of a partial structure of a fuel pump assembly provided in an embodiment of the present application;

[0020] FIG3 is a schematic diagram of the internal component structure of a housing of a fuel pump assembly provided in an embodiment of the present application;

[0021] FIG. 4 is a schematic diagram of the structure of a fuel tank system provided in an embodiment of the present application.

[0022] Description of reference numerals:

[0023] 100-base frame;

[0024] 200- pump body;

[0025] 300-Oil supply pipeline;

[0026] 400-temperature control pipeline; 410-water inlet pipeline; 420-temperature adjustment chamber; 430-water return pipeline;

[0027] 500-housing;

[0028] 600-filter element;

[0029] 700-first test piece;

[0030] 800 - connecting pipe; 810 - first end; 820 - second end. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] 1 and 2 , an embodiment of the utility model provides a fuel pump assembly, which is arranged in a fuel tank, and includes a base frame 100, a pump body 200, a fuel supply pipeline 300 and a temperature control pipeline 400. The pump body 200 is arranged on the base frame 100; the fuel supply pipeline 300 is arranged on the base frame 100, and the fuel supply pipeline 300 is suitable for connecting the fuel tank with an external device, and conveying the medium in the fuel tank to the external device under the drive of the pump body 200; the temperature control pipeline 400 includes an inlet pipeline 410, a temperature regulating chamber 420 and a return pipeline 430 that are interconnected, the fuel supply pipeline 300 is penetrated in the temperature regulating chamber 420, and the temperature control pipeline 400 is connected to the external temperature control device. Under the drive of the external temperature control device, the temperature regulating medium flows into the temperature regulating chamber 420 through the inlet pipeline 410 and then flows out through the return pipeline 430, and the medium in the fuel supply pipeline 300 changes temperature under the action of the temperature regulating medium.

[0038] In this embodiment, the pump body 200 is arranged on the base frame 100, and the oil supply pipeline 300 is also arranged on the base frame 100, so that the pump body 200 can effectively drive and deliver the medium in the oil tank to the external device. This structural design makes the oil supply process more stable and reliable, can meet the needs of the external device for the medium, and improves the efficiency of the fuel system. The temperature control pipeline 400 includes a water inlet pipeline 410, a temperature adjustment chamber 420 and a return water pipeline 430. By connecting with an external temperature control device, the temperature of the medium in the oil supply pipeline 300 is controlled. The water inlet pipeline 410 is responsible for introducing the temperature adjustment medium into the temperature adjustment chamber 420, and the medium in the temperature adjustment chamber 420 performs heat exchange with the medium in the oil supply pipeline 300, thereby achieving temperature adjustment, and the return water pipeline 430 re-leads out the adjusted medium. This temperature control design helps to ensure that the medium in the oil supply pipeline 300 can maintain the required temperature under different working conditions, improves the fluidity and stability of the medium, and helps to improve the combustion efficiency of the fuel and the engine performance.

[0039] By passing the oil supply line 300 through the temperature regulating chamber 420, the temperature regulating medium fills the temperature regulating chamber 420, and the contact area with the oil supply line 300 is increased. This can promote heat transfer and heat exchange, making the temperature regulation more rapid and uniform. By increasing the contact area, the temperature control line 400 has a more sufficient heat exchange with the oil supply line 300, and can more effectively adjust the temperature of the medium in the oil supply line 300 to ensure that the medium reaches the required temperature requirement. Since the heat exchange is more sufficient and the temperature regulation is more stable, a stable oil temperature is particularly important in some application scenarios with high requirements for the oil supply temperature, such as high-performance engines or oil supply systems under special working conditions. In summary, the design of arranging the oil supply line 300 in the temperature regulating chamber 420 can optimize the heat exchange efficiency of the temperature control line 400, improve the accuracy and stability of temperature regulation, and thus further improve the performance and reliability of the fuel pump assembly.

[0040] Referring to FIG. 2 , in one embodiment, a housing 500 is further included. The housing 500 is sleeved on the outer side of the ends of the fuel supply pipeline 300 and the temperature control pipeline 400. The pump body 200 is arranged in the housing 500, and the housing 500 is connected to the base frame 100. The housing 500 is connected to the base frame 100, and plays a role in protecting and supporting the pump body 200 and the pipeline, and also helps to maintain temperature stability. The design of the housing 500 helps to isolate the pump body 200 and the pipeline from the external environment, thereby protecting them from external physical damage or environmental influences. In addition, the presence of the housing 500 can also provide a certain heat insulation effect, which helps to maintain the temperature stability of the medium in the pipeline. This structural design enables the fuel pump assembly to operate more reliably in various working environments and can better adapt to different working conditions and requirements.

[0041] Referring to FIG. 2 and FIG. 3 , in one embodiment, a filter element 600 is further included, and the filter element 600 is detachably disposed in the fuel supply pipeline 300, and is suitable for filtering the medium in the fuel supply pipeline 300. The addition of the filter element 600 can effectively filter impurities and solid particles in the medium, and ensure the quality of the medium in the fuel supply pipeline 300. By setting the filter element 600, impurities and particles can be prevented from entering the pump body 200 and external equipment, thereby protecting the normal operation of the pump body 200 and the equipment and extending their service life. In addition, the detachable design of the filter element 600 also facilitates cleaning and replacement, and improves the convenience and efficiency of maintenance. Such a design enhances the reliability and stability of the fuel pump assembly, enables it to continue to provide efficient fuel supply services in long-term use, and reduces the need for maintenance and repair.

[0042] Referring to FIG. 2 and FIG. 3, in one embodiment, a first detection member 700 is further included, one end of which is arranged on the housing 500, and the other end extends into the fuel tank, suitable for detecting the liquid level of the medium in the fuel tank. The first detection member 700 is designed to monitor the liquid level of the medium in the fuel tank in real time. By connecting one end of it to the housing 500 and the other end extending into the fuel tank, the liquid level height in the fuel tank can be directly sensed. Such a design enables the fuel pump assembly to timely understand the liquid level of the medium in the fuel tank, thereby effectively controlling the medium supply in the fuel tank, and avoiding the interruption of fuel supply or the damage of the pump body 200 due to insufficient medium. By adding the first detection member 700, the use of the fuel pump assembly is safer and more reliable, which can ensure the stable operation of the fuel supply system and improve the real-time response capability to the change of the medium liquid level.

[0043] Referring to FIG. 2 and FIG. 3 , in one embodiment, a connecting pipe 800 is further included. The first end 810 of the connecting pipe 800 is arranged on the housing 500, and the second end 820 of the connecting pipe 800 is arranged on the side of the housing 500 located in the fuel tank. The connecting pipe 800 is suitable for connecting the medium inside and outside the fuel tank to balance the internal pressure of the fuel tank to atmospheric pressure. The design of the connecting pipe 800 allows the medium inside and outside the fuel tank to freely exchange gas, thereby maintaining the gas pressure inside the fuel tank at a level close to the environment. The purpose of this is to prevent negative pressure or excessive pressure from being generated in the fuel tank, and to avoid the situation where the medium flows poorly or bubbles are generated due to uneven pressure. By maintaining the balance of the internal pressure of the fuel tank, the stability and reliability of the fuel supply system can be effectively improved. The setting of the connecting pipe 800 allows the fuel pump assembly to maintain a good operating state under various working conditions, thereby ensuring that the fuel supply system can continuously provide a stable supply of medium.

[0044] In one embodiment, the connecting pipe 800 further includes a plugging member, which is arranged at the second end 820 of the connecting pipe 800; the connecting pipe 800 remains connected in the vertical state, and the plugging member blocks the second end 820 under the action of gravity in the tilted state, and the connecting pipe 800 is closed. In this embodiment, the design of the connecting pipe 800 further enhances the safety and stability of the oil tank system. The first end 810 and the second end 820 of the connecting pipe 800 are connected in a normal state to ensure that the pressure inside the oil tank is balanced with the atmosphere, and to prevent abnormal oil supply or leakage caused by pressure imbalance. The plugging member is a key part of the connecting pipe 800, located at the second end 820 of the connecting pipe 800, and adopts a steel ball design. In the vertical state, the plugging member remains in an open state to ensure normal oil supply to the oil tank. However, when the oil tank flips or tilts, the plugging member, i.e., the steel ball, will automatically block the second end 820 of the connecting pipe 800 under the action of gravity, so that the connecting pipe 800 is closed. This design plays a key role in the event of a rollover or accident, and can effectively prevent fuel leakage and reduce the risk of fire and safety accidents. Through the combination of the connecting pipe 800 and the plugging member, the fuel tank system of this embodiment not only achieves the stability and reliability of fuel supply, but also greatly improves the safety of the system in unexpected situations, providing effective protection for the safe operation of the vehicle.

[0045] In one embodiment, the temperature control line 400 is connected to the engine, and the temperature regulating medium is the engine coolant. In this embodiment, the temperature control line 400 is integrated with the engine's cooling system to achieve precise control of the temperature of the fuel supply line 300. By connecting to the engine's cooling system, the temperature control line 400 can use the engine's coolant to adjust the temperature of the medium in the fuel supply line 300. When the engine is running, the coolant will flow through the temperature regulating chamber 420 through the temperature control line 400, thereby changing the temperature of the medium in the fuel supply line 300. This design can not only ensure the temperature stability of the medium in the fuel supply line 300, but also use the engine's own cooling system to achieve automatic temperature regulation, thereby improving the efficiency and stability of the system. Such an embodiment enables the fuel pump assembly to better adapt to different working conditions and ambient temperatures when the engine is working, ensuring that the temperature of the medium in the fuel supply line 300 is in an optimal state, thereby improving the performance and reliability of the fuel pump assembly.

[0046] Referring to FIG. 4 , an embodiment of the utility model further provides a fuel tank system, including the above-mentioned fuel pump assembly, a main fuel tank and a sub-fuel tank, wherein the fuel pump assembly is arranged in the sub-fuel tank, and a fuel supply pipeline 300 connects the sub-fuel tank and the main fuel tank. The main fuel tank and the sub-fuel tank are respectively used to store fuel, and they are connected by a fuel supply pipeline 300. The main fuel tank is usually used to store the main fuel reserve, while the sub-fuel tank is used as a spare fuel reserve or for a specific application.

[0047] This dual fuel tank design can increase the vehicle's mileage and improve the reliability of fuel supply. When the fuel in the main tank is consumed, the system controls the fuel pump assembly to transfer the fuel in the auxiliary tank to the main tank to ensure the continuous operation of the vehicle. In this embodiment, the fuel pump assembly is installed in the auxiliary tank. This design helps to reduce the load and vibration of the pump body 200 and improve the stability and life of the fuel pump. At the same time, arranging the fuel pump assembly in the auxiliary tank can also save space in the main tank, making the main tank more flexible and can be used to install other vehicle components or increase fuel capacity. By arranging the fuel pump assembly in the auxiliary tank and connecting the fuel supply line 300 of the main tank and the auxiliary tank, this embodiment provides a flexible and reliable tank system that not only meets the demand for fuel supply, but also improves the performance and ease of use of the vehicle.

[0048] Referring to FIG. 4 , in one embodiment, a control component and a second detection component arranged in the main fuel tank are further included, and the second detection component is suitable for detecting the medium liquid level in the main fuel tank. The control component is a key component in the fuel tank system, which is responsible for monitoring the fuel situation in the fuel tank and controlling the working state of the fuel pump as needed. The control component determines the medium liquid level in the main fuel tank according to the data of the second detection component, and performs corresponding control operations according to the preset logic to ensure the stability and safety of the fuel supply in the fuel tank. The second detection component is installed in the main fuel tank, and its main function is to detect the medium liquid level in the main fuel tank. It can obtain the remaining amount of fuel in the main fuel tank by measuring the height of the liquid level. The data of the second detection component is read and processed by the control component, and the corresponding control operation is performed according to the fuel situation in the main fuel tank. For example, when the liquid level in the main fuel tank is lower than the preset minimum liquid level, the control component may start the fuel pump to supply fuel to the main fuel tank to ensure the continuity of the fuel supply. Through the cooperation of the control component and the second detection component, the fuel tank system can realize accurate control and management of the fuel supply, improve the utilization efficiency of the fuel, and also ensure the safety and reliability of the fuel supply.

[0049] Referring to FIG. 4 , in one embodiment, the control component reads the data of the second detection component. When the liquid level of the main fuel tank is lower than the preset minimum liquid level, the control component controls the pump body 200 to start and supply fuel to the main fuel tank, ensuring that there is always enough fuel supply in the main fuel tank to ensure the normal operation of the vehicle. When the liquid level of the main fuel tank reaches the preset maximum liquid level, the control component controls the pump body 200 to stop supplying fuel to avoid excessive fuel supply by the fuel pump, which may cause fuel overflow or waste in the main fuel tank. When the liquid level of the auxiliary fuel tank is lower than the minimum liquid level setting value, the control component controls the pump body 200 to stop working to avoid running out of fuel in the auxiliary fuel tank, causing fuel supply interruption or damage to the pump body 200. Through the above control strategy, the control component can effectively manage the fuel supply in the tank and ensure the safe, stable and reliable operation of the vehicle fuel system.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fuel pump assembly, arranged in a fuel tank, characterized in that: include: Base frame (100); A pump body (200), wherein the pump body (200) is arranged on the base frame (100); An oil supply pipeline (300), the oil supply pipeline (300) being arranged on the base frame (100), the oil supply pipeline (300) being suitable for connecting the oil tank with an external device, and conveying the medium in the oil tank to the external device under the drive of the pump body (200); A temperature control pipeline (400), the temperature control pipeline (400) comprising a water inlet pipeline (410), a temperature adjustment chamber (420) and a water return pipeline (430) which are interconnected, the oil supply pipeline (300) being arranged in the temperature adjustment chamber (420), the temperature control pipeline (400) being connected to an external temperature control device, and under the drive of the external temperature control device, a temperature adjustment medium flows into the temperature adjustment chamber (420) through the water inlet pipeline (410) and then flows out through the water return pipeline (430), and the medium in the oil supply pipeline (300) changes temperature under the action of the temperature adjustment medium.

2. The fuel pump assembly according to claim 1, characterized in that: It also includes a shell (500), the shell (500) is sleeved on the outer sides of the ends of the oil supply pipeline (300) and the temperature control pipeline (400), the pump body (200) is arranged in the shell (500), and the shell (500) is connected to the base frame (100).

3. The fuel pump assembly according to claim 1, characterized in that: It also includes a filter element (600), which is detachably disposed in the oil supply pipeline (300) and is suitable for filtering the medium in the oil supply pipeline (300).

4. The fuel pump assembly according to claim 2, characterized in that: It also includes a first detection member (700), one end of which is arranged on the housing (500) and the other end of which extends into the oil tank, and is suitable for detecting the liquid level of the medium in the oil tank.

5. The fuel pump assembly according to claim 2, characterized in that: The invention also comprises a connecting pipe (800), wherein a first end (810) of the connecting pipe (800) is arranged on the shell (500), and a second end (820) of the connecting pipe (800) is arranged on a side of the shell (500) located inside the oil tank, and the connecting pipe (800) is suitable for connecting the medium inside and outside the oil tank to balance the internal pressure of the oil tank to atmospheric pressure.

6. The fuel pump assembly according to claim 5, characterized in that: The connecting pipe (800) further comprises a blocking member, wherein the blocking member is arranged at the second end (820) of the connecting pipe (800); In the vertical state, the connecting pipe (800) remains connected, and in the tilted state, the blocking member blocks the second end (820) under the action of gravity, and the connecting pipe (800) is closed.

7. The fuel pump assembly according to claim 1, characterized in that: The temperature control pipeline (400) is connected to the engine, and the temperature regulating medium is the coolant of the engine.

8. A fuel tank system, characterized in that: It comprises a fuel pump assembly, a main fuel tank and a subsidiary fuel tank as claimed in any one of claims 1 to 7, wherein the fuel pump assembly is arranged in the subsidiary fuel tank, and a fuel supply pipeline (300) connects the subsidiary fuel tank and the main fuel tank.

9. The fuel tank system according to claim 8, characterized in that: It also includes a control component and a second detection component arranged in the main oil tank, and the second detection component is suitable for detecting the medium liquid level in the main oil tank.

10. The fuel tank system according to claim 9, characterized in that: The control component reads the data of the second detection component, and when the liquid level of the main oil tank is lower than a preset minimum liquid level, the control component controls the pump body (200) to start and supply oil to the main oil tank; when the liquid level of the main oil tank reaches a preset maximum liquid level, the control component controls the pump body (200) to stop supplying oil; when the liquid level of the auxiliary oil tank is lower than a minimum liquid level setting value, the control component controls the pump body (200) to stop working.

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