CN215633664U - Urea pump and engine - Google Patents

Urea pump and engine Download PDF

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Publication number
CN215633664U
CN215633664U CN202121020092.1U CN202121020092U CN215633664U CN 215633664 U CN215633664 U CN 215633664U CN 202121020092 U CN202121020092 U CN 202121020092U CN 215633664 U CN215633664 U CN 215633664U
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China
Prior art keywords
valve
urea
pump
return spring
protection
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CN202121020092.1U
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Chinese (zh)
Inventor
王毓源
王金平
赵杰
徐文双
侯郭顺
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Abstract

The utility model relates to the technical field of engines, in particular to a urea pump and an engine. The urea pump comprises a pump body, a diaphragm and a pump cover, wherein the diaphragm is arranged in the pump body; the pump cover sets up in the pump body, and pump cover, pump body and diaphragm three form the pressure accumulation chamber that holds the urea, are provided with feed liquor valve, play liquid valve and protective valve on the pump cover, and the protective valve is opened after urea pump outage and is used for discharging the urea of pressure accumulation intracavity. The protection valve can be located the remaining urea discharge pump in the pressure accumulation intracavity after the urea pump outage outside to prevent under the low temperature condition that the urea in the urea pump freezes and breaks the diaphragm, in addition, the protection valve can go on after the engine shuts down the outage, owing to directly discharge urea from the urea pump in, the sound of suck-back can not appear, consequently can improve the use experience after the driver shuts down.

Description

Urea pump and engine
Technical Field
The utility model relates to the technical field of engines, in particular to a urea pump and an engine.
Background
In a diesel engine aftertreatment system for a vehicle, urea needs to be supplied for an SCR reaction, and therefore a urea pump is required to suck urea out of a urea tank and supply the urea for injection and pressure. The prior urea pump mostly adopts a film type urea pump, and when the urea pump is stopped for a long time in a low-temperature environment, the urea in the film type urea pump has the risk of freezing and breaking the film; therefore, opening the reverse valve in the urea injection system is generally used to evacuate the urea in the cavity of the urea pump by suck-back after the engine is shut down, thereby protecting the urea pump. However, the suck-back process requires that the engine cannot be powered off within a period of time after being shut down, and noise is generated during suck-back, which affects the experience of a driver.
Therefore, a urea pump is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a urea pump and an engine, which can enable urea in a pressure accumulation cavity to flow back to a urea box after the urea pump is powered off, prevent a film from being broken by icing in the urea pump and play a role in protecting the film.
In order to achieve the purpose, the utility model adopts the following technical scheme:
provided is a urea pump including:
a pump body;
a diaphragm disposed within the pump body;
the pump cover is arranged in the pump body, the pump cover, the pump body and the diaphragm form a pressure accumulation cavity for containing urea, a liquid inlet valve, a liquid outlet valve and a protection valve are arranged on the pump cover, and the protection valve is opened after the urea pump is powered off and used for discharging the urea in the pressure accumulation cavity.
As an optimal technical scheme of the urea pump, an arc-shaped groove is formed in the end face, close to one end of the diaphragm, of the pump cover, a protection valve hole is formed in the pump cover, the protection valve is arranged in the protection valve hole, and the protection valve hole is communicated with the bottom of the arc-shaped groove.
As an optimal technical scheme of the urea pump, the protection valve includes a valve core, a valve body, a connecting rod, a suction structure and a base, the valve core and the base are respectively disposed at two ends of the protection valve, the base is respectively fixedly connected with the pump cover and the valve body, the suction structure is disposed in a cavity of the valve body, two ends of the connecting rod are respectively connected with the valve core and the suction structure, and the suction structure is powered on and powered off to enable the connecting rod to move along an axial direction of the protection valve hole.
As a preferable technical solution of the above urea pump, the base is provided with a flow passage hole through which urea can flow out of the pump body, and the diameter of the valve body is smaller than the inner diameter of the protection valve hole.
As a preferable technical solution of the urea pump, the suction structure includes a coil and an iron core, the iron core is connected to the valve core through the connecting rod, the coil is sleeved on the valve body, and the coil is powered on to suck the iron core to move toward the valve core.
As an optimal technical scheme of the urea pump, the suction structure further comprises a return spring, the return spring is sleeved on the valve body, the return spring is respectively abutted against the valve body and the iron core, and the coil is located in a space formed by the return spring.
As an optimal technical scheme of the urea pump, the protection valve further comprises a return spring, the return spring is sleeved on the connecting rod, and the return spring is respectively abutted against the valve body and the valve core.
As an optimal technical scheme of the urea pump, a first abutting groove is formed in one end, abutted against the return spring, of the valve body, the return spring and the coil are both arranged in the first abutting groove, a second abutting groove is formed in one end, abutted against the return spring, of the valve body, and a third abutting groove is formed in one end, abutted against the return spring, of the valve core.
As a preferred technical scheme of the urea pump, the valve body is in threaded connection with the base, and the base is in threaded connection with the pump cover.
The utility model also provides an engine comprising the urea pump.
The utility model has the beneficial effects that:
the urea pump provided by the utility model comprises a pump body, a diaphragm and a pump cover, wherein the diaphragm is arranged in the pump body; the pump cover sets up in the pump body, and pump cover, pump body and diaphragm three form the pressure accumulation chamber that holds the urea, are provided with feed liquor valve, play liquid valve and protective valve on the pump cover, and the protective valve is opened after urea pump outage and is used for discharging the urea of pressure accumulation intracavity. The protection valve can be located the remaining urea discharge pump in the pressure accumulation intracavity after the urea pump outage outside to prevent under the low temperature condition, the urea in the urea pump is iced and is broken the diaphragm, and in addition, the protection valve can be opened after the engine shuts down the outage, owing to directly discharge urea in following the urea pump, the sound of suck-back can not appear, consequently can improve the use experience after the driver shuts down.
Drawings
FIG. 1 is a cross-sectional view of a urea pump provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a protection valve provided in an embodiment of the present invention.
In the figure:
1. a pump body; 2. a diaphragm; 3. a pump cover; 31. a lower cover; 32. an upper cover; 4. a liquid inlet valve; 5. a liquid outlet valve; 6. a protection valve; 61. a valve core; 62. a valve body; 63. a connecting rod; 64. a base; 641. a flow passage hole; 65. a coil; 66. an iron core; 67. a return spring; 68. a return spring; 7. a connection core body; 8. a strut; 9. a bearing; 10. an eccentric wheel; 11. a motor shaft.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The embodiment provides an engine, after the engine stops working, the urea pump is in a power-off state, residual urea in the urea pump can be discharged, and therefore urea ice is prevented from puncturing a diaphragm 2 in a low-temperature state.
As shown in fig. 1, the urea pump includes a pump body 1, a diaphragm 2, a connection core body 7, a pump cover 3, a support rod 8, a bearing 9, an eccentric wheel 10 and a driving motor, wherein the pump body 1 is provided with a working chamber, the diaphragm 2 and the pump cover 3 are arranged in the pump body 1, specifically in the working chamber, and the pump cover 3 and the diaphragm 2 are located at two ends of the working chamber. The pump cover comprises an upper cover 32 and a lower cover 31, the upper cover 32 is connected with the lower cover 31 in a sealing mode, and the upper cover 32 and the lower cover 31 are both located in the pump body 1. One end of the diaphragm 2 is sleeved on the connecting core body 7, the connecting core body 7 is connected with the supporting rod 8 in an interference fit manner, namely, the diaphragm 2 is connected with the supporting rod 8 through the connecting core body 7, and the supporting rod 8 is connected with the eccentric wheel 10 through the bearing 9. A motor shaft 11 of the driving motor is sleeved with an eccentric wheel 10. Wherein pump cover 3, the pump body 1 and 2 three of diaphragm form the pressure accumulation chamber that holds the urea, and when driving motor rotated, driving motor can drive diaphragm 2 and reciprocate, made pressure accumulation chamber produce negative pressure or malleation to realize that urea gets into or discharges in this pump body 1.
The pump cover 3 is provided with a liquid inlet valve 4, a liquid outlet valve 5 and a protection valve 6, the liquid inlet valve 4 is used for sucking urea into the pressure accumulation cavity, the liquid outlet valve 5 is used for discharging the urea out of the pressure accumulation cavity, the protection valve 6 is opened after the urea pump is powered off to discharge the urea in the pressure accumulation cavity, namely the protection valve 6 is in a power-on state under the working state of the urea pump, and is in a power-off state under the power-off state of the urea pump. The protection valve 6 can be located outside the residual urea discharge pump in the pressure accumulation cavity after the urea pump is powered off, thereby preventing that the urea in the urea pump freezes to break the diaphragm 2 under the low-temperature condition, and in addition, the protection valve 6 can be opened after the engine is shut down and powered off, and the urea is directly discharged from the urea pump, so that the suck-back sound can not occur, and the use experience after the driver is shut down can be improved.
Preferably, in order to facilitate the exit of urea from the pump body 1, a protection valve 6 is arranged between the inlet valve 4 and the outlet valve 5, in particular on the central axis of the pump body 1, i.e. the inlet valve 4 and the outlet valve 5 are arranged symmetrically with respect to the protection valve 6. And in order to make urea flow out of the pressure accumulation cavity completely, an arc-shaped groove is formed in the end face of one end, close to the diaphragm 2, of the pump cover 3, a protection valve hole is formed in the pump cover 3, and the protection valve hole is communicated with the bottom of the arc-shaped groove. Because the shape of arc recess, urea can gather in the bottommost of arc recess, consequently the bottom intercommunication of protection valve opening and arc recess, then can guarantee that remaining urea in the pump body 1 is discharged from the pump body 1 to further guarantee that the urea pump is not destroyed.
Specifically, an arc-shaped groove is provided on the top of the upper pump cover 32, and a protection valve hole is provided on both the upper cover 32 and the lower cover 31, i.e., the protection valve hole penetrates through the upper cover 32 and the lower cover 31.
Preferably, in the present embodiment, the protection valve 6 in the power-off state discharges urea out of the pump body 1, so that the valve core 61 does not block the connection between the protection valve hole and the arc-shaped groove in the power-off state of the protection valve 6. As shown in fig. 2, the protection valve 6 includes a valve core 61, a valve body 62, a link 63, a restoring structure, and a seat 64. The valve core 61 and the base 64 are respectively arranged at two ends of the protection valve 6, the base 64 is respectively fixedly connected with the pump cover and the valve body 62, the suction recovery structure is arranged in a cavity of the valve body 62, and the connecting rod 63 can axially move when the suction recovery structure is switched on or off. After the suction recovery structure is powered off, the connecting rod 63 moves towards the direction of the base 64, and after the suction recovery structure is powered on, the connecting rod 63 can move towards the valve core 61, and because the valve core 61 is positioned at one end of the protection valve hole close to the arc-shaped groove, the movement of the valve core 61 can communicate the protection valve hole and the arc-shaped groove. It should be noted that, in order to ensure that the protection valve hole is better blocked or released by the valve core 61, in this embodiment, the protection valve hole includes a large hole and a small hole, the small hole is respectively connected with the arc-shaped groove and the large hole, and a chamfer is provided at a joint of the large hole and the small hole, that is, a side wall of the joint of the large hole and the small hole is obliquely disposed. Correspondingly, the valve core 61 is provided with an inclined side wall which can be attached to the side wall of the joint, when the valve core 61 plugs the protection valve hole, the inclined side wall of the valve core 61 can be attached to the side wall of the joint, the sealing performance of the valve core and the protection valve hole is improved, and urea is prevented from leaking from the protection valve hole.
Specifically, in an embodiment of the present invention, the valve body 62 is screwed to the base 64, and the base 64 is screwed to the lower pump cover 31. This connection facilitates the installation of the valve body 62 and the base 64, and also facilitates the removal of the protective valve 6 when the valve is blocked, and facilitates the replacement or maintenance of the protective valve 6.
In an embodiment of the present invention, the base 64 and the pump cover 3 may be connected by an interference fit connection, and the valve body 62 and the base 64 are also connected by an interference fit connection. In an embodiment of the present invention, the valve body 62 and the base 64, and the base 64 and the pump cover 3 are connected by a screw thread and an interference fit.
In this embodiment, the base 64 is provided with a flow passage hole 641 through which urea can flow out of the pump body 1, the valve body 62 has a diameter smaller than the inner diameter of the protection valve hole, and when urea flows into the protection valve hole from the valve core 61, the urea flows into a cavity formed by the valve body 62 and the protection valve hole and then flows out of the protection valve 6 through the flow passage hole 641. In order to recycle urea, the base 64 communicates with the urea tank, and urea flows out of the base 64, and then directly returns to the urea tank to be reused after the urea pump is powered on.
Of course, in an embodiment of the present invention, the diameter of the valve body 62 may be the same as the diameter of the protection valve hole, the base 64 may be provided with the flow passage hole 641 through which urea can flow out of the pump body 1, and the valve body 62 may be provided with a through hole communicating with the flow passage hole, so that urea can flow out of the pump body 1 from the valve body 62 and the base 64.
Further, in the present embodiment, the suction structure includes a coil 65 and an iron core 66, the iron core 66 is connected to the valve core 61 through the link 63, the coil 65 is sleeved on the valve body 62, and the iron core 66 can be sucked and moved toward the valve core 61 by energizing the coil 65. The coil 65 is sleeved on the valve body 62, the coil 65 generates magnetic force after being electrified, the iron core 66 can be adsorbed, the iron core 66 is separated from the base 64, and the valve core 61 connected with the iron core 66 also moves synchronously along with the movement of the iron core 66, so that the purpose of plugging the protective valve hole is achieved.
Under the condition that the urea pump is in complete vertical horizontal plane, iron core 66 relies on self gravity to move down after protection valve 6 loses electricity, thereby drive case 61 and open the protection valve hole, because the installation has the error of removal, the effect that iron core 66 probably moved down is not good, in order to guarantee that protection valve 6 is in the state of opening after the urea pump outage, in this embodiment, inhale the compound structure and still include reset spring 67, valve body 62 is located to reset spring 67 cover, reset spring 67 respectively with valve body 62 and iron core 66 butt, coil 65 is located the space that reset spring 67 formed. After the coil 65 is powered off, the return spring 67 pushes the iron core 66 toward the base 64 under the action of its own elastic restoring force, and the valve core 61 is driven by the iron core 66 to move toward the base 64, so that the purpose that the valve core 61 is automatically opened after the protection valve 6 is powered off is achieved.
If the electromagnetic force of the coil 65 is relied on, pressure fluctuation may exist in the operating state of the urea pump, and the valve core 61 vibrates during the fluctuation process, so that the protection valve 6 is opened, and the urea flows out from the protection valve 6. For this purpose, in an embodiment of the present invention, the protection valve 6 further includes a return spring 68, the return spring 68 is sleeved on the connecting rod 63, and the return spring 68 is respectively abutted against the valve body 62 and the valve core 61. In the energized state, the return spring 68 and the return spring 67 are both in a compressed state, the elastic force of the return spring 68 is smaller than the elastic force of the return spring 67, and the return spring 68 and the coil 65 are matched with each other, so that the valve core 61 is ensured not to move in position in the energized state. In the de-energized state, the return spring 68 is in a stretched state.
Preferably, in this embodiment, one end of the valve body 62 abutting against the return spring 67 is provided with a first abutting groove, the return spring 67 and the coil 65 are arranged in the first abutting groove, the valve core 61 is prevented from generating vibration due to the position movement of the return spring 67 and the coil 65, the sealing effect of the protection valve 6 in the energized state is further ensured, one end of the valve body 62 abutting against the return spring 68 is provided with a second abutting groove, and one end of the valve core 61 abutting against the return spring 68 is provided with a third abutting groove. This structure can prevent the return spring 68 from moving in position, and further improve the stability of the 6 components of the protection valve.
In the power-on state of the urea pump, the coil 65 in the protection valve 6 is kept powered on, the coil 65 generates magnetic force to attract the iron core 66 to overcome the elastic force of the return spring 67 and move upwards with the help of the elastic force of the return spring 68, and at the moment, the valve core 61 seals the protection valve hole under the driving of the valve rod. When the urea pump continuously supplies power to work, the protection valve 6 keeps a power-on closing state, the pressure accumulation cavity in the urea pump keeps a closed state at the moment, and when the motor shaft rotates, the eccentric wheel 10 is driven by the motor shaft to rotate; because the supporting rod 8 is connected with the eccentric wheel 10 through the bearing 9, the supporting rod 8 moves up and down under the driving of the eccentric wheel 10 to drive the connecting core body 7 to extrude the diaphragm 2 up and down, the volume of the pressure accumulation cavity is changed under the influence of the deformation of the diaphragm 2, urea enters from the liquid inlet valve 4 when the volume of the pressure accumulation cavity is increased, and urea flows out from the liquid outlet valve 5 when the volume of the pressure accumulation cavity is reduced.
In the power-off state of the urea pump, the coil 65 in the protection valve 6 is powered off, the magnetic force of the coil 65 disappears, the iron core 66 moves in the direction of the base 64 under the action of the return spring 67, the valve core 61 moves synchronously with the iron core 66, at the moment, the protection valve 6 is opened, and urea in the pressure accumulation cavity flows out of the protection valve 6.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A urea pump, comprising:
a pump body (1);
a diaphragm (2), the diaphragm (2) being disposed within the pump body (1);
pump cover (3), set up in the pump body (1), pump cover (3) the pump body (1) with diaphragm (2) three forms the pressure accumulation chamber that holds urea, be provided with feed liquor valve (4), play liquid valve (5) and protection valve (6) on pump cover (3), protection valve (6) open after urea pump outage be used for with the urea of pressure accumulation intracavity is discharged.
2. A urea pump according to claim 1, characterized in that an arc-shaped groove is provided on the end face of the pump cover (3) near the end of the diaphragm (2), a protection valve hole is provided on the pump cover (3), the protection valve (6) is disposed in the protection valve hole, and the protection valve hole communicates with the bottom of the arc-shaped groove.
3. The urea pump according to claim 2, wherein the protection valve (6) includes a valve core (61), a valve body (62), a connecting rod (63), a suction structure and a base (64), the valve core (61) and the base (64) are respectively disposed at two ends of the protection valve (6), the base (64) is respectively fixedly connected with the pump cover (3) and the valve body (62), the suction structure is disposed in a cavity of the valve body (62), two ends of the connecting rod (63) are respectively connected with the valve core (61) and the suction structure, and the suction structure is powered on and powered off to enable the connecting rod (63) to move along an axial direction of the protection valve hole.
4. Urea pump according to claim 3, characterized in that the base (64) is provided with a flow passage opening for the urea to flow out of the pump body (1), the valve body (62) having a diameter smaller than the inner diameter of the protection valve opening.
5. The urea pump according to claim 3, wherein the suction structure comprises a coil (65) and an iron core (66), the iron core (66) is connected with the valve core (61) through the connecting rod (63), the coil (65) is sleeved on the valve body (62), and the coil (65) is electrified to suck the iron core (66) to move towards the valve core (61).
6. Urea pump according to claim 5, characterized in that the suction structure further comprises a return spring (67), the return spring (67) is sleeved on the valve body (62), the return spring (67) abuts against the valve body (62) and the iron core (66), respectively, and the coil (65) is located in the space formed by the return spring (67).
7. Urea pump according to claim 6, characterized in that the protection valve (6) further comprises a return spring (68), the return spring (68) being sleeved on the connecting rod (63), the return spring (68) abutting against the valve body (62) and the valve spool (61) respectively.
8. Urea pump according to claim 7, characterized in that the end of the valve body (62) that abuts against the return spring (67) is provided with a first abutment groove, in which both the return spring (67) and the coil (65) are arranged, in that the end of the valve body (62) that abuts against the return spring (68) is provided with a second abutment groove, and in that the end of the valve spool (61) that abuts against the return spring (68) is provided with a third abutment groove.
9. Urea pump according to any of the claims 3-8, characterized in that the valve body (62) is screwed to the base (64), and that the base (64) is screwed to the pump cover (3).
10. An engine comprising a urea pump according to any one of claims 1-9.
CN202121020092.1U 2021-05-13 2021-05-13 Urea pump and engine Active CN215633664U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121020092.1U CN215633664U (en) 2021-05-13 2021-05-13 Urea pump and engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121020092.1U CN215633664U (en) 2021-05-13 2021-05-13 Urea pump and engine

Publications (1)

Publication Number Publication Date
CN215633664U true CN215633664U (en) 2022-01-25

Family

ID=79938215

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121020092.1U Active CN215633664U (en) 2021-05-13 2021-05-13 Urea pump and engine

Country Status (1)

Country Link
CN (1) CN215633664U (en)

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