External self-cooling fuel pump for electronic injection

Abstract

The utility model provides an electronic injection external self-cooling fuel pump which comprises an outer shell, a self-cooling cavity is formed in the outer shell, a pump body is installed in the self-cooling cavity, one conveying port of the pump body is communicated with the self-cooling cavity, a gap for liquid to flow is formed between the inner wall of the self-cooling cavity and the outer wall of the pump body, and the self-cooling cavity is communicated with the pump body. A first liquid conveying port and a second liquid conveying port are formed in the outer shell, one conveying port of the pump body is communicated with the second liquid conveying port, and the other conveying port of the pump body is located in the self-cooling cavity. The pump body is arranged in the self-cooling cavity of the outer shell, and one conveying port of the pump body is communicated with the self-cooling cavity, so that when the pump body works, oil in the self-cooling cavity is driven to take away heat on the outer surface of the pump body, external oil cooling of the fuel pump is achieved, the temperature of the fuel pump can be prevented from being higher than an allowable value, bubbling of the pumped oil is avoided, and the service life of the fuel pump is prolonged. And moreover, the complexity and the cumbersome connecting process of the radiating fins are avoided, and meanwhile, no extra fan needs to be purchased.

Description

Technical Field

[0001] This utility model relates to an externally mounted, self-cooled fuel pump with electronic fuel injection. Background Technology

[0002] The fuel pump is a fundamental component of the fuel injection system in electronic fuel injection vehicles. If the temperature of a current fuel pump exceeds the allowable limit, it can cause the pumped fuel to bubble, affecting the normal injection of fuel by the injectors. Therefore, the fuel pump requires a dedicated cooling system. Current fuel pumps use air cooling, specifically: heat dissipation fins are evenly distributed around the pump body, and an external fan blows air to dissipate heat from the fins. This cooling method has the following disadvantages: 1. The connection process between the heat dissipation fins and the pump body is complex and cumbersome; 2. An additional fan is required, increasing costs, and the fan also occupies additional installation space. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide an externally mounted, self-cooling fuel pump for electronic fuel injection.

[0004] This utility model is implemented using the following scheme: an externally mounted self-cooling fuel pump for electronic fuel injection: including an outer shell, a self-cooling chamber is provided inside the outer shell, a pump body is installed inside the self-cooling chamber, and one of the delivery ports of the pump body is connected to the self-cooling chamber.

[0005] Furthermore, there is a gap between the inner wall of the self-cooling chamber and the outer wall of the pump body for liquid flow.

[0006] Furthermore, the outer casing is provided with a first liquid delivery port and a second liquid delivery port, one delivery port of the pump body is connected to the second liquid delivery port, and the other delivery port of the pump body is located in the self-cooling chamber.

[0007] Furthermore, one end of the outer casing is provided with a pump body mounting port that communicates with the self-cooling chamber. An end cap is provided on the pump body mounting port, the second liquid delivery port is provided on the end cap, and the pump body is sandwiched between the end cap and the bottom of the self-cooling chamber.

[0008] Furthermore, a delivery port is provided at each end of the pump body, and a first pump body limiting groove is provided at the bottom of the self-cooling chamber corresponding to the end of the pump body. A clearance groove is provided on the first pump body limiting groove corresponding to the output port of the pump body. At least one delivery channel connecting the clearance groove and the self-cooling chamber is opened on the side of the first pump body limiting groove.

[0009] Furthermore, a second pump body limiting groove is provided on the inner end face of the end cap corresponding to the end of the pump body, and a clearance hole is provided on the middle part of the second pump body limiting groove corresponding to the delivery port of the pump body. A sealing ring is provided at the joint between the delivery port of the pump body and the clearance hole. The second liquid delivery port is opened on the side of the end cap and communicates with the clearance hole.

[0010] Furthermore, a gasket mounting groove is provided on the outer periphery of the pump body mounting port, and a sealing gasket is installed in the gasket mounting groove. The sealing gasket is sandwiched between the bottom of the gasket mounting groove and the end cover. The end of the pump body passes through the sealing gasket and is fixed to the second pump body limiting groove. Sealing rings are provided at the joint between the sealing gasket and the wall of the gasket mounting groove, and at the joint between the sealing gasket and the pump body and the inner end face of the end cover.

[0011] Furthermore, a sealing gasket abutment platform that mates with the gasket mounting groove is provided on the middle part of the inner end face of the end cover. The second pump body limiting groove is opened on the middle part of the sealing gasket abutment platform. The sealing gasket is sandwiched between the bottom of the gasket mounting groove and the sealing gasket abutment platform. A sealing ring is provided at the joint between the sealing gasket, the pump body, and the sealing gasket abutment platform.

[0012] Furthermore, a sensor mounting groove is provided on the outer end face of the end cover, and an oil pressure sensor is installed in the sensor mounting groove. The clearance hole penetrates the end cover and communicates with the sensor mounting groove. The connection between the clearance hole and the sensor mounting groove is sealed by the sensing head of the oil pressure sensor. The sensing head of the oil pressure sensor is locked in the mounting chamber by bolts and a sealing ring is provided at the joint. A sensor end cover is provided on the outer end face of the end cover corresponding to the sensor mounting groove.

[0013] Furthermore, a controller is installed inside the sensor end cap, and a circuit connector is provided on one end of the pump body located in the second pump body limiting groove. A clearance opening is provided on the second pump body limiting groove corresponding to the circuit connector, which connects the sensor mounting groove and the second pump body limiting groove. The circuit connector and the oil pressure sensor are both electrically connected to the controller.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By placing the pump body inside the self-cooling chamber of the outer shell and connecting one of the pump body's delivery ports to the self-cooling chamber, the pump body will carry away the heat from the outer surface of the pump body when it is working, thus achieving external oil cooling for the fuel pump. This can prevent the fuel pump temperature from exceeding the allowable value, prevent the pumped oil from bubbling, and avoid the complexity and cumbersome process of connecting the heat sink fins. At the same time, it does not require the purchase of an additional fan; 2. A compact DC brushless water pump is used. The pump body's output delivery port is sensed by an oil pressure sensor. When the oil pressure is greater than the set value, the speed of the DC brushless water pump decreases. When the oil pressure is lower than the set value, the speed of the DC brushless water pump increases. This enables real-time adjustment of oil pressure and precise control of oil pressure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 4 for Figure 3 Schematic diagram of the AA section structure;

[0019] Figure 5 This is a side view of the structure of this utility model;

[0020] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the middle BB;

[0021] Figure 7 In order to be in Figure 6 A schematic diagram of the three-dimensional structure in cross-section;

[0022] Figure 8 This is a schematic diagram of the outer shell of this utility model.

[0023] In the diagram: 1-Outer shell; 2-Self-cooling chamber; 3-Pump body; 4-Gap; 5-First liquid delivery port; 6-Second liquid delivery port; 7-Pump body mounting port; 8-End cap; 9-Oil inlet; 10-Oil outlet; 11-First pump body limiting groove; 12-Leaving groove; 13-Delivery channel; 14-Second pump body limiting groove; 15-Leaving hole; 16-Sealing ring; 17-Gasket mounting groove; 18-Sealing gasket; 19-Sealing gasket abutment platform; 20-Sensor mounting groove; 21-Oil pressure sensor; 22-Sensor end cap; 23-Controller; 24-Circuit connector; 25-Leaving opening; 26-Line connector. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] like Figure 1-4 As shown, an externally mounted self-cooling fuel pump for electronic fuel injection includes a housing 1, a self-cooling chamber 2 inside the housing, and a pump body 3 installed inside the self-cooling chamber. One of the pump body's delivery ports is connected to the self-cooling chamber. In use, the housing is connected to the electronic fuel injection system of the vehicle. The self-cooling chamber of the housing is connected to the fuel tank via a pipeline. The delivery port on the pump body, which is not directly connected to the self-cooling chamber, is connected to the vehicle's fuel injection system. When the pump body is working, it drives the fuel in the self-cooling chamber to be output to the vehicle's fuel injection system. At the same time, because the fuel in the self-cooling chamber is drawn in by the pump body, it also drives the self-cooling chamber to draw in fuel from the fuel tank, so that the fuel continuously carries away the heat from the pump body, thereby achieving self-cooling. This can prevent the fuel pump temperature from exceeding the allowable value, prevent the pumped fuel from bubbling, and avoid the complexity and cumbersome process of connecting the heat sink fins. It also eliminates the need to purchase an additional fan.

[0028] In this embodiment, for the sake of reasonable design, the inner wall of the self-cooling chamber and the outer wall of the pump body are not attached together. Instead, there is a gap 4 between the inner wall of the self-cooling chamber and the outer wall of the pump body to allow liquid flow. That is, through the gap between the inner wall of the self-cooling chamber and the outer wall of the pump body, when the pump body drives the oil output of the self-cooling chamber, the oil tank will continuously supply oil to the outer shell, and the oil will carry away the heat of the outer wall of the pump body.

[0029] In this embodiment, to achieve the connection between the outer casing and the external fuel tank, the outer casing is provided with a first liquid delivery port 5 and a second liquid delivery port 6. In this embodiment, the first liquid delivery port is used as the oil inlet and the second liquid delivery port is used as the oil outlet. The oil inlet is connected to the fuel tank, and the oil outlet is connected to the electronic fuel injection system of the vehicle. Alternatively, the first liquid delivery port can be used as the oil outlet and the second liquid delivery port can be used as the oil inlet. One delivery port of the pump body is connected to the second liquid delivery port, and the other delivery port of the pump body is located in the self-cooling chamber. The two delivery ports of the pump body are the oil inlet and the oil outlet, respectively. The oil outlet is connected to the second liquid delivery port, that is, the oil outlet is connected to the oil outlet, and the oil inlet is located in the self-cooling chamber.

[0030] In this embodiment, in order to install the pump body inside the outer casing, one end of the outer casing is provided with a pump body mounting port 7 that communicates with the self-cooling chamber. An end cap 8 is provided on the pump body mounting port. The end cap is bolted to the outer casing and covers the pump body mounting port. The second liquid delivery port is provided on the end cap, or more specifically, on the side of the end cap. The first liquid delivery port is located on the outer wall of the outer casing, that is, the oil outlet is located on the end cap, and the oil inlet is located on the outer wall of the outer casing. The pump body is sandwiched between the end cap and the bottom of the self-cooling chamber. That is, the pump body is clamped and fixed by the end cap and the self-cooling chamber. At the same time, after the oil enters the self-cooling chamber from the oil inlet, it passes through the oil inlet of the pump body, the pump body, the oil outlet of the pump body, and the oil outlet in sequence, so that the oil can carry away the heat of the pump body.

[0031] In this embodiment, to achieve the installation of the pump body, the specific installation structure is as follows: To achieve the installation of the oil inlet end of the pump body, conveying ports are respectively provided on both ends of the pump body. The two conveying ports are: oil inlet 9 and oil outlet 10. The oil inlet and oil outlet are respectively located at both ends of the pump body. A first pump body limiting groove 11 is provided on the bottom of the self-cooling chamber corresponding to the end of the pump body. A clearance groove 12 is provided on the first pump body limiting groove corresponding to the output port of the pump body. At least one conveying channel 13 connecting the clearance groove and the self-cooling chamber is opened on the side of the first pump body limiting groove. That is, the oil inlet end of the pump body is fixed on the first pump body limiting groove, and then the bottom of the first pump body limiting groove is provided with a clearance groove corresponding to the oil inlet of the pump body. At the same time, the clearance groove and the self-cooling chamber are connected through the conveying channel, so that when the pump body is working, the oil is input into the self-cooling chamber from the first liquid conveying port. At this time, the first liquid conveying port corresponds to the outer wall of the pump body, and then the oil is sequentially conveyed through the pump body. The oil inlet of the pump body is finally connected to the delivery channel and the clearance groove, so that the working path of the oil will pass through the outer wall of the pump body, which facilitates further heat removal from the pump body. At the same time, in order to realize the installation of the oil outlet end of the pump body, a second pump body limiting groove 14 is opened on the inner end face of the end cover corresponding to the end of the pump body. A clearance hole 15 is opened in the middle of the second pump body limiting groove corresponding to the delivery port of the pump body. That is, a clearance hole is opened in the middle of the second pump body limiting groove corresponding to the oil outlet. A sealing ring 16 is set at the joint between the delivery port of the pump body and the clearance hole. Here, the delivery port of the pump body refers to the oil outlet of the pump body. That is, a sealing ring is set at the joint between the oil outlet of the pump body and the clearance hole. The second liquid delivery port is opened on the side of the end cover. The second liquid delivery port is connected to the clearance hole. Specifically, the second liquid delivery port is set perpendicular to the clearance hole. When the oil outlet of the pump body outputs oil to the clearance hole, the oil in the clearance hole is output through the second liquid delivery port.

[0032] In this embodiment, to further achieve a seal between the end cover and the pump body mounting port, a gasket mounting groove 17 is provided on the outer periphery of the pump body mounting port. A sealing gasket 18 is installed in the gasket mounting groove. The sealing gasket mainly serves to limit the position of the sealing ring. The sealing gasket is sandwiched between the bottom of the gasket mounting groove and the end cover. The end of the pump body passes through the sealing gasket and is fixed to the second pump body limiting groove. Sealing rings are provided at the joints between the sealing gasket and the wall of the gasket mounting groove, and at the joints between the sealing gasket and the pump body and the inner end face of the end cover. The sealing rings seal the sealing gasket and the wall of the gasket mounting groove. The structure is more specifically as follows: a sealing gasket abutment 19 that mates with the gasket mounting groove is provided on the middle part of the inner end face of the end cover; the second pump body limiting groove is opened on the middle part of the sealing gasket abutment; the sealing gasket is sandwiched between the bottom of the gasket mounting groove and the sealing gasket abutment; a sealing ring is provided at the joint between the sealing gasket, the pump body, and the sealing gasket abutment; and in this embodiment, the inner end face of the end cover refers to the side of the end cover facing the pump body mounting port, and the outer end face of the end cover refers to the side of the end cover facing away from the pump body mounting port.

[0033] In this embodiment, in order to monitor the oil pressure and facilitate the adjustment of the pump speed, a sensor mounting groove 20 is provided on the outer end face of the end cover. An oil pressure sensor 21 is installed in the sensor mounting groove. The clearance hole penetrates the end cover and communicates with the sensor mounting groove. The connection between the clearance hole and the sensor mounting groove is sealed by the sensing head of the oil pressure sensor. The sensing head of the oil pressure sensor is locked in the mounting chamber by bolts and a sealing ring is provided at the joint. A sensor end cover 22 is provided on the outer end face of the end cover corresponding to the sensor mounting groove. The sensor end cover and the end cover are connected by bolts.

[0034] In this embodiment, an existing controller 23 is installed inside the sensor end cover. A circuit connector 24 is provided on one end of the pump body located in the second pump body limiting groove. A clearance port 25 is provided on the second pump body limiting groove corresponding to the circuit connector, which passes through the sensor mounting groove and the second pump body limiting groove. The circuit connector and the oil pressure sensor are electrically connected to the controller. A line connector 26 electrically connected to the controller is provided outside the sensor end cover. At the same time, the sealing ring provided at the joint between the sealing gasket, the pump body, and the sealing gasket abutment platform can prevent oil from entering the non-clearance hole area in the second pump body limiting groove, so that the oil will not enter the clearance port and then enter the sensor mounting groove.

[0035] In this embodiment, a compact DC brushless water pump is used. The pump body's output delivery port is equipped with an oil pressure sensor to sense the oil pressure. When the oil pressure is greater than the set value, the speed of the DC brushless water pump decreases. When the oil pressure is lower than the set value, the speed of the DC brushless water pump increases. This enables real-time adjustment of the oil pressure and precise control of the oil pressure.

[0036] In this embodiment, the working principle is as follows: the first liquid delivery port of the outer shell is connected to the fuel tank, and the second liquid delivery port is connected to the fuel injector of the automotive fuel injection system. When the pump body is working, the oil enters the self-cooling chamber through the first liquid delivery port, then passes through the gap between the inner wall of the self-cooling chamber and the outer wall of the pump body, and then passes through the delivery channel and the clearance groove in sequence before finally entering the oil inlet of the pump body. The oil is then delivered by the pump body to the oil inlet and the clearance hole, and finally output from the second liquid delivery port to the fuel injector of the automotive fuel injection system.

[0037] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0038] If the terms "first" or "second" are used in this document to specify the components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing the components in the description. Unless otherwise stated, the above terms have no special meaning.

[0039] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0040] Furthermore, the orientations or positional relationships indicated by terms such as "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in any of the technical solutions disclosed in this utility model are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this patent. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent. In addition, unless otherwise stated, the terms used to indicate shape in any of the technical solutions disclosed in this utility model include shapes that are similar to, close to, or approximate with it.

[0041] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An externally mounted, self-cooled fuel pump with electronic fuel injection, characterized in that: It includes an outer casing, a self-cooling chamber is provided inside the outer casing, a pump body is installed inside the self-cooling chamber, and one of the delivery ports of the pump body is connected to the self-cooling chamber.

2. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 1, characterized in that: There is a gap between the inner wall of the self-cooling chamber and the outer wall of the pump body for liquid flow.

3. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 1, characterized in that: The outer casing is provided with a first liquid delivery port and a second liquid delivery port. One delivery port of the pump body is connected to the second liquid delivery port, and the other delivery port of the pump body is located in the self-cooling chamber.

4. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 3, characterized in that: One end of the outer casing is provided with a pump body mounting port that communicates with the self-cooling chamber. An end cap is provided on the pump body mounting port, and the second liquid delivery port is provided on the end cap. The pump body is sandwiched between the end cap and the bottom of the self-cooling chamber.

5. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 4, characterized in that: The pump body is provided with a conveying port at both ends. The bottom of the self-cooling chamber is provided with a first pump body limiting groove corresponding to the end of the pump body. The first pump body limiting groove is provided with a clearance groove corresponding to the output port of the pump body. At least one conveying channel connecting the clearance groove and the self-cooling chamber is opened on the side of the first pump body limiting groove.

6. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 4, characterized in that: A second pump body limiting groove is provided on the inner end face of the end cap corresponding to the end of the pump body. A clearance hole is provided on the middle part of the second pump body limiting groove corresponding to the delivery port of the pump body. A sealing ring is provided at the joint between the delivery port of the pump body and the clearance hole. The second liquid delivery port is provided on the side of the end cap and communicates with the clearance hole.

7. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 6, characterized in that: A gasket mounting groove is provided on the outer periphery of the pump body mounting port. A sealing gasket is installed in the gasket mounting groove. The sealing gasket is sandwiched between the bottom of the gasket mounting groove and the end cover. The end of the pump body passes through the sealing gasket and is fixed to the second pump body limiting groove. Sealing rings are provided at the joint between the sealing gasket and the wall of the gasket mounting groove, and at the joint between the sealing gasket and the pump body and the inner end face of the end cover.

8. The externally mounted, self-cooled fuel pump according to claim 7, characterized in that: A sealing gasket abutment is provided on the middle of the inner end face of the end cap, which mates with the gasket mounting groove. The second pump body limiting groove is opened on the middle of the sealing gasket abutment. The sealing gasket is sandwiched between the bottom of the gasket mounting groove and the sealing gasket abutment. A sealing ring is provided at the joint between the sealing gasket, the pump body, and the sealing gasket abutment.

9. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 6, characterized in that: A sensor mounting groove is provided on the outer end face of the end cover, and an oil pressure sensor is installed in the sensor mounting groove. The clearance hole penetrates the end cover and communicates with the sensor mounting groove. The connection between the clearance hole and the sensor mounting groove is sealed by the sensing head of the oil pressure sensor. The sensing head of the oil pressure sensor is locked in the mounting chamber by bolts and a sealing ring is provided at the joint. A sensor end cover is provided on the outer end face of the end cover corresponding to the sensor mounting groove.

10. The externally mounted, self-cooled fuel pump with electronic fuel injection according to claim 9, characterized in that: A controller is installed inside the sensor end cap. A circuit connector is provided on one end of the pump body located in the second pump body limiting groove. A clearance opening is provided on the second pump body limiting groove corresponding to the circuit connector, which connects the sensor mounting groove and the second pump body limiting groove. The circuit connector and the oil pressure sensor are both electrically connected to the controller.

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