Electromagnetic oil pump for fuel heater

Abstract

The utility model relates to the technical field of oil pumps for fuel heaters, in particular to an electromagnetic oil pump for a fuel heater. The electromagnetic clutch comprises a shell, an oil inlet nozzle and an oil outlet nozzle, an electromagnetic coil assembly and an armature component are installed in the shell, the armature component axially slides in a reciprocating mode in the shell under the action of the electromagnetic coil assembly, a socket electrically connected with the electromagnetic coil assembly is arranged on the outer side of the shell, and the oil inlet nozzle and the oil outlet nozzle are in interference fit with the inner wall of the electromagnetic coil assembly. An oil outlet valve body connected with the armature component is arranged in the end, facing the armature component, of the oil outlet nozzle, a backflow preventing assembly is arranged on the side, away from the armature component, of the oil outlet valve body, and a filtering assembly is arranged in the end, close to the armature component, of the oil inlet nozzle. After the prior art is improved, the structure is relatively simple, the assembly is quicker and more efficient, and the oil inlet nozzle and the oil outlet nozzle are integrally connected with the shell more firmly and are not easy to separate.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps for fuel heaters, in particular to an electromagnetic oil pump for fuel heaters. Background Art

[0002] Car heaters are mainly used to preheat the engine and provide heating for the cab in winter. The oil pump of the heater delivers the sucked fuel to the atomizer through the oil pipeline. The atomizer atomizes the fuel through the centrifugal force and mixes it with the air sucked by the power-assisted fan in the car in the main combustion chamber of the engine to burn. The heat energy after the fuel is fully burned is transferred to the water jacket, which causes the medium in the water jacket interlayer to heat up, thereby achieving the purpose of heating.

[0003] For example, a Chinese patent document with authorization number CN215908022U discloses a heater oil pump with excellent waterproof performance, including a shell, an oil inlet connecting sleeve is provided at one axial end of the shell, an oil outlet connecting sleeve is provided at the other end, the oil inlet connecting sleeve is provided with an oil inlet nozzle, the oil outlet connecting sleeve is provided with an oil outlet nozzle, an electromagnetic coil assembly and an armature component that is acted upon by the electromagnetic coil assembly to make axial reciprocating sliding in the shell are provided in the shell, a socket is provided on the outside of the shell, a first ring groove is provided on the outer wall of the end where the oil inlet connecting sleeve is inserted into the shell, a second ring groove is provided on the outer wall of the end where the oil outlet connecting sleeve is inserted into the shell, a third ring groove is provided on the end where the socket is plugged into the shell, and the first, second and third ring grooves are all provided. A sealing member is provided, and an oil outlet valve body connected to the armature component is provided at one end of the oil outlet connecting sleeve facing the oil inlet connecting sleeve, and a one-way anti-backflow assembly is provided between the oil outlet valve body and the oil outlet nozzle; in the above-mentioned heater oil pump, the oil inlet nozzle and the oil outlet nozzle are respectively connected to the outer casing with the aid of the oil inlet connecting sleeve and the oil outlet connecting sleeve as intermediate connecting members, and the structure is relatively complex, resulting in a relatively cumbersome and time-consuming assembly process. In addition, the oil inlet connecting sleeve maintains an axially tight connection only through the friction force generated by squeezing between the sealing member and the outer casing. During long-term use, the armature component generates an outward force on the oil inlet connecting sleeve, which makes it easy for the oil inlet connecting sleeve to slowly move out of the inner casing, and there is a risk of falling off and affecting the normal operation of the oil pump.

[0004] Therefore, it is necessary to improve the deficiencies in the above prior art. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an electromagnetic oil pump for a fuel heater in view of the deficiencies of the above-mentioned prior art, so as to solve the problems in the prior art that the structure is relatively complex, resulting in a relatively cumbersome and time-consuming assembly process, and the oil inlet connecting sleeve has insufficient tightening force, resulting in it being easy to separate from the inside of the shell during use.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electromagnetic oil pump for a fuel heater, comprising a shell, an oil inlet nozzle and an oil outlet nozzle, an electromagnetic coil assembly and an armature component that is acted upon by the electromagnetic coil assembly to make axial reciprocating sliding movement in the shell are installed in the shell, a socket that is electrically connected to the electromagnetic coil assembly is provided on the outer side of the shell, the oil inlet nozzle and the oil outlet nozzle are respectively interference fit with the inner wall of the electromagnetic coil assembly, an end of the oil outlet nozzle that faces the armature component is internally provided with an oil outlet valve body that is connected to the armature component, a side of the oil outlet valve body that is away from the armature component is provided with an anti-backflow component, and an end of the oil inlet nozzle that is close to the armature component is internally provided with a filter component.

[0007] By adopting the above technical solution, the oil inlet nozzle and the oil outlet nozzle are directly interference fit with the inner wall of the electromagnetic coil assembly in the outer shell, the oil outlet valve body and the anti-backflow assembly are directly installed inside the oil outlet nozzle, and the filter assembly is directly installed inside the oil inlet nozzle, eliminating intermediate connecting parts such as the oil inlet connecting sleeve and the oil outlet connecting sleeve. The structure is relatively simple and the assembly is faster and more efficient.

[0008] The above technical solution is further configured as follows: the electromagnetic coil assembly includes a coil frame, a coil sleeved on the coil frame, and an insulating sleeve wrapped around the outer periphery of the coil; the oil inlet nozzle and the oil outlet nozzle are each provided with a plurality of convex rings on the outer periphery of one end close to the coil frame; an annular groove is formed between the convex rings; a sealing ring is sleeved in the annular groove; an annular groove corresponding to the convex ring is provided on the inner wall of the coil frame; the convex ring can be inserted into the annular groove and fit with the groove surface of the annular groove.

[0009] By adopting the above technical scheme, when installing the oil inlet nozzle, the oil inlet nozzle is squeezed into the coil frame until the convex ring is snapped into the corresponding annular groove. This not only makes it easy to ensure that the installation is in place, but also makes the connection between the oil inlet nozzle and the coil frame more secure. During long-term use, the oil inlet nozzle is not prone to axial deviation and fall off. The sealing ring sleeved in the annular groove not only improves the sealing performance but also increases the anti-falloff resistance. The installation of the oil outlet nozzle is similar and will not be elaborated here.

[0010] The above technical solution is further configured as follows: the armature component includes an armature, a plunger rod that passes through the armature and is fixedly connected to the armature at one end, and a sealing gasket; the armature is provided with a clamping groove for clamping the sealing gasket at one end close to the filter assembly; the plunger rod is clearance-matched with the oil outlet valve body at one end away from the armature; the plunger rod is sleeved with a first return spring located between the armature and the oil outlet valve body; the filter assembly includes a filter screen and a filter screen seat installed between the filter screen and the sealing gasket; the filter screen seat is provided with a filter screen cavity close to one side of the filter screen; an oil hole connected to the filter screen cavity is provided at the center of the filter screen seat; the outer periphery of the filter screen seat presses the outer periphery of the filter screen against the inner circumferential side wall of the oil inlet nozzle; the sealing gasket can seal and block the oil hole when the electromagnetic coil assembly is not energized, and no longer seal and block the oil hole after the electromagnetic coil assembly is energized.

[0011] By adopting the above technical scheme, when the electromagnetic coil assembly is not energized, under the elastic force of the first return spring, the armature drives the sealing gasket to seal and block the oil hole on the filter seat, so that the fuel cannot enter the interior of the oil pump, that is, the oil pump is in a closed state; when the electromagnetic coil assembly is energized, the electromagnetic field generated will magnetize the armature and attract the armature to drive the plunger rod and the sealing gasket to move axially away from the oil hole, then the sealing gasket no longer seals and blocks the oil hole, and the fuel can flow through the filter to filter impurities and then flow through the oil hole into the interior of the oil pump, that is, the oil pump is in an open state, and when the electromagnetic coil assembly is de-energized, under the elastic force of the first return spring, the armature drives the sealing gasket to seal and block the oil hole on the filter seat again.

[0012] The above technical solution is further configured as follows: the anti-backflow assembly includes a valve seat, a steel ball and a second return spring, one end of the valve seat is sleeved with the oil outlet valve body, and the other end is abutted against the inner circumferential side wall of the oil outlet nozzle, an oil passage is provided at the center of the valve seat, one end of the oil passage is away from the oil outlet valve body and is a conical bell mouth, and the other end is connected with the oil outlet valve body, the valve seat is provided with a movable groove for the steel ball to move at the bell mouth, half of the steel ball is located in the movable groove, and the other half is located in the bell mouth, one end of the second return spring is abutted against the steel ball, and the other end is abutted against the inner bottom surface of the oil outlet nozzle.

[0013] By adopting the above technical solution, when the oil pump is in the open state, the oil pressure in the oil pump is relatively high and can impact the steel ball and squeeze the second return spring away from the bell mouth, so that the fuel can flow through the oil channel, through the oil outlet nozzle and finally out of the oil pump. When the oil pump is in the closed state or the oil pressure in the oil pump is relatively low, under the action of the elastic force of the second return spring, the steel ball moves close to the bell mouth again and blocks the oil channel, thereby realizing one-way flow of the fuel and preventing fuel backflow.

[0014] The above technical solution is further configured as follows: a rubber pad is provided on one end surface of the valve seat facing the oil outlet valve body, and a through hole communicating with the oil passage is provided on the rubber pad.

[0015] By adopting the above technical solution, the rubber pad is provided to reduce the impact force of the plunger on the valve seat and play a shock-absorbing role.

[0016] The above technical solution is further configured as follows: a clamping ring is provided on the outer periphery of the oil outlet nozzle, and a cover plate is also sleeved on the outer periphery of the oil outlet nozzle, one side of the cover plate abuts against the clamping ring, and the other side abuts against the proximal end of the electromagnetic coil assembly.

[0017] By adopting the above technical solution, the oil nozzle is pressed against the cover plate through the retaining ring, and the cover plate is pressed against the electromagnetic coil assembly, thereby improving the internal sealing and preventing dust from entering the electromagnetic coil assembly, thereby playing a certain protective role. At the same time, the provision of the cover plate increases the force-bearing surface and improves the overall stability.

[0018] The beneficial effects achieved by the utility model are: the structure is relatively simple, the assembly is faster and more efficient, and the overall connection between the oil inlet nozzle and the oil outlet nozzle and the shell is more firm and is not easy to separate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional view of an embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the explosion structure of an embodiment of the utility model;

[0022] Figure 4 is a cross-sectional view of an electromagnetic coil assembly in an embodiment of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the armature component in the embodiment of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the filter assembly in the embodiment of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the backflow prevention component in the embodiment of the utility model. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-7As shown in the figure, an electromagnetic oil pump for a fuel heater includes a shell 1, an oil inlet nozzle 2 and an oil outlet nozzle 3. An electromagnetic coil assembly 4 and an armature component 5 that is acted upon by the electromagnetic coil assembly 4 and performs axial reciprocating sliding in the shell 1 are installed in the shell 1. A socket 6 electrically connected to the electromagnetic coil assembly 4 is provided on the outer side of the shell 1. The oil inlet nozzle 2 and the oil outlet nozzle 3 are respectively interference-fitted with the inner wall of the electromagnetic coil assembly 4. An oil outlet valve body 7 connected to the armature component 5 is provided inside the end of the oil outlet nozzle 3 facing the armature component 5. A backflow prevention component 8 is provided on the side of the oil outlet valve body 7 away from the armature component 5. A filter is provided inside the end of the oil inlet nozzle 2 close to the armature component 5. Component 9, the electromagnetic coil component 4 includes a coil frame 41, a coil 42 sleeved on the coil frame 41 and an insulating sleeve 43 wrapped around the outer periphery of the coil 42. The coil frame 41, the coil 42, the insulating sleeve 43 and the socket 6 are integrally formed by bakelite die-casting. A plurality of convex rings 21 are provided on the outer periphery of one end of the oil inlet nozzle 2 and the oil outlet nozzle 3 close to the coil frame 41. An annular groove 22 is formed between the convex rings 21. A sealing ring 23 is sleeved in the annular groove 22. An annular groove 410 corresponding to the convex ring 21 is provided on the inner wall of the coil frame 41. The convex ring 21 can be inserted into the annular groove 410 and fit with the groove surface of the annular groove 410.

[0028] like Figure 5 , 6 As shown in the figure, the armature component 5 includes an armature 51, a plunger rod 52 that penetrates the armature 51 and is fixedly connected to the armature 51 at one end, and a sealing gasket 53. The armature 51 is provided with a clamping groove 510 for clamping the sealing gasket 53 at one end close to the filter assembly 9. The armature 51 and one end of the plunger rod 52 can be fixedly connected by a riveting process. The end of the plunger rod 52 away from the armature 51 is in clearance with the oil outlet valve body 7. The plunger rod 52 is sleeved with a first return spring 54 located between the armature 51 and the oil outlet valve body 7. The filter assembly 9 includes a filter screen 91 and a filter screen 91 installed on the filter screen 91 and The filter seat 92 between the sealing gaskets 53 has a filter cavity 921 provided on the side of the filter seat 92 close to the filter 91, and an oil hole 922 connected to the filter cavity 921 is provided in the center of the filter seat 92. The outer periphery of the filter seat 92 presses the outer periphery of the filter against the inner circumferential side wall of the oil inlet nozzle 2. The sealing gasket 53 can seal and block the oil hole 922 when the electromagnetic coil assembly 4 is not energized, and no longer seals and blocks the oil hole 922 after the electromagnetic coil assembly 4 is energized. The sealing gasket 53 can be made of rubber, and the rubber has elasticity at one end, which can play a role in shock absorption and noise reduction.

[0029] like Figure 7As shown in the figure, the backflow prevention component 8 includes a valve seat 81, a steel ball 82 and a second return spring 83. One end of the valve seat 81 is sleeved with the oil outlet valve body 7, and the other end is abutted against the inner circumferential side wall of the oil outlet nozzle 3. An oil passage 810 is provided in the center of the valve seat 81. One end of the oil passage 810 away from the oil outlet valve body 7 is a conical bell mouth 811, and the other end is connected with the oil outlet valve body 7. The valve seat 81 is provided with a movable groove 812 for the steel ball 82 to move at the bell mouth 811. Half of the steel ball 82 is located in the movable groove 812, and the other half is located in the bell mouth 811. One end of the second return spring 83 is abutted against the steel ball 82, and the other end is abutted against the inner bottom surface of the oil outlet nozzle 3. A rubber pad 83 is provided on the end surface of the valve seat 81 facing the oil outlet valve body 7. The rubber pad 83 is provided with a through hole connected to the oil passage 810. The rubber pad 83 can reduce the impact force of the plunger on the valve seat 81, thereby playing a shock absorbing role.

[0030] like Figure 2 , 3 As shown in , a clamp ring 31 is provided on the outer periphery of the oil outlet nozzle 3, and a cover plate 11 is also sleeved on the outer periphery of the oil outlet nozzle 3. One side of the cover plate 11 abuts against the clamp ring 31, and the other side abuts against the near end of the electromagnetic coil assembly 4.

[0031] In the above embodiment, the oil inlet nozzle 2 and the oil outlet nozzle 3 are directly interference fit with the inner wall of the electromagnetic coil assembly 4 in the housing 1, the oil outlet valve body 7 and the anti-backflow assembly 8 are directly installed in the oil outlet nozzle 3, and the filter assembly 9 is directly installed in the oil inlet nozzle 2, eliminating intermediate connectors such as the oil inlet connecting sleeve and the oil outlet connecting sleeve, and the structure is relatively simple, and the assembly is faster and more efficient; when installing the oil inlet nozzle 2, the oil inlet nozzle 2 is squeezed into the coil frame 41 until the convex ring 21 is snapped into the corresponding annular groove 410, which is not only easy to determine that the installation is in place but also makes the connection between the oil inlet nozzle 2 and the coil frame 41 more firmly. During long-term use, the oil inlet nozzle 2 is not easy to deviate axially and fall off, and the sealing ring 23 sleeved in the annular groove 22 not only improves the sealing but also increases the anti-falloff resistance; the installation of the oil outlet nozzle 3 is similar, which will not be elaborated here.

Claims

1. An electromagnetic oil pump for a fuel heater, comprising a housing, an oil inlet nozzle and an oil outlet nozzle, wherein an electromagnetic coil assembly and an armature component that is acted upon by the electromagnetic coil assembly to make axial reciprocating sliding movement in the housing are installed in the housing, and a socket electrically connected to the electromagnetic coil assembly is provided on the outer side of the housing, characterized in that: The oil inlet nozzle and the oil outlet nozzle are respectively interference fit with the inner wall of the electromagnetic coil assembly, and an oil outlet valve body connected to the armature component is provided inside the end of the oil outlet nozzle facing the armature component, an anti-backflow component is provided on the side of the oil outlet valve body away from the armature component, and a filter component is provided inside the end of the oil inlet nozzle close to the armature component.

2. The electromagnetic oil pump for a fuel heater according to claim 1, characterized in that: The electromagnetic coil assembly includes a coil frame, a coil sleeved on the coil frame, and an insulating sleeve wrapped around the outer periphery of the coil. The oil inlet nozzle and the oil outlet nozzle are each provided with a plurality of convex rings on the outer periphery of one end close to the coil frame, an annular groove is formed between the convex rings, a sealing ring is sleeved in the annular groove, and an annular groove corresponding to the convex ring is provided on the inner wall of the coil frame, and the convex ring can be inserted into the annular groove and fit with the groove surface of the annular groove.

3. The electromagnetic oil pump for a fuel heater according to claim 2, characterized in that: The armature component includes an armature, a plunger rod that passes through the armature and is fixedly connected to the armature at one end, and a sealing gasket. The armature is provided with a clamping groove for clamping the sealing gasket at one end close to the filter assembly, and the plunger rod is clearance-matched with the oil outlet valve body at one end away from the armature. The plunger rod is sleeved with a first return spring located between the armature and the oil outlet valve body. The filter assembly includes a filter screen and a filter screen seat installed between the filter screen and the sealing gasket. The filter screen seat is provided with a filter screen cavity close to one side of the filter screen, and an oil hole connected to the filter screen cavity is provided at the center of the filter screen seat. The outer periphery of the filter screen seat presses the outer periphery of the filter screen against the inner circumferential side wall of the oil inlet nozzle. The sealing gasket can seal and block the oil hole when the electromagnetic coil assembly is not energized, and no longer seal and block the oil hole after the electromagnetic coil assembly is energized.

4. The electromagnetic oil pump for a fuel heater according to claim 3, characterized in that: The anti-backflow assembly includes a valve seat, a steel ball and a second return spring, one end of the valve seat is sleeved with the oil outlet valve body, and the other end is abutted against the inner circumferential side wall of the oil outlet nozzle, an oil passage is provided at the center of the valve seat, one end of the oil passage away from the oil outlet valve body is a conical bell mouth, and the other end is connected with the oil outlet valve body, the valve seat is provided with a movable groove for the steel ball to move at the bell mouth, half of the steel ball is located in the movable groove, and the other half is located in the bell mouth, one end of the second return spring is abutted against the steel ball, and the other end is abutted against the inner bottom surface of the oil outlet nozzle.

5. The electromagnetic oil pump for a fuel heater according to claim 4, characterized in that: A rubber pad is arranged on one end surface of the valve seat facing the oil outlet valve body, and a through hole communicating with the oil passage is arranged on the rubber pad.

6. An electromagnetic oil pump for a fuel heater according to any one of claims 1 to 4, characterized in that: A clamping ring is arranged on the outer periphery of the oil outlet nozzle, and a cover plate is also sleeved on the outer periphery of the oil outlet nozzle. One side of the cover plate abuts against the clamping ring, and the other side abuts against the proximal end of the electromagnetic coil assembly.

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