CN116037578A

CN116037578A - Cleaning device for inner runner of urea injector

Info

Publication number: CN116037578A
Application number: CN202310340838.4A
Authority: CN
Inventors: 孙晶; 魏巍
Original assignee: Wuhu Yingde Intelligent Technology Co ltd; Yantai Yingde Precision Machinery Co ltd
Current assignee: Wuhu Yingde Intelligent Technology Co ltd; Yantai Yingde Precision Machinery Co ltd
Priority date: 2023-04-03
Filing date: 2023-04-03
Publication date: 2023-05-02
Anticipated expiration: 2043-04-03
Also published as: CN116037578B

Abstract

The utility model discloses a cleaning device for an inner runner of a urea injector, which relates to the cleaning field of the urea injector and comprises a cleaning water tank, a circulating water pipe and a circulating pump, wherein a top plate is arranged at the upper end of the cleaning water tank, a plurality of water outlet branch pipes are arranged at the water outlet end of the circulating water pipe, cleaning components are arranged below each water outlet branch pipe and are communicated with the corresponding cleaning components through control valves, an adjusting component is arranged at the rear part of each cleaning component, a fixing component is arranged at the front end of each cleaning component, a plurality of fixing blocks are arranged at the lower end of the top plate, the cleaning components, the adjusting components and the fixing components are all arranged on the fixing blocks, a mounting cavity is arranged in each fixing block, a plug-in port for connecting the urea injector is arranged at one side of the fixing block, which faces the opening of the cleaning water tank and is not closed by the top plate, and the plug-in port is communicated with the mounting cavity. The urea sprayer fixing device is simple in urea sprayer fixing mode and convenient to operate, can clean urea sprayers with different lengths, and improves applicability of the urea sprayer fixing device.

Description

Cleaning device for inner runner of urea injector

Technical Field

The utility model relates to the cleaning field of urea injectors, in particular to a cleaning device for an inner runner of a urea injector.

Background

The urea injector is a common automobile part, is mainly arranged in an exhaust pipe, and has very high working environment temperature, and is usually 500-600 ℃. A problem that often arises with urea injectors during use is that urea solution tends to sinter and clog the nozzles in the injector.

The utility model patent with publication number of CN213887450U discloses a cleaning device for an inner runner of a urea injector, which comprises a workbench, wherein a workpiece seat and a sealing seat for blocking an upper port of the urea injector are arranged on the optional workbench, the optional sealing seat is arranged right above an optional workpiece, a guide rod is vertically arranged on the side part of the optional workpiece seat, and the optional sealing seat is connected with the optional guide rod in a sliding manner; the optional guide rod is sleeved with a spring, the first end of the optional spring is connected with the upper end face of the optional workbench, and the second end of the optional spring is connected with the optional support bearing.

When the above patent is used, the following disadvantages exist: firstly, the applicability is poor, more urea injectors in the prior art are not all straight tubular, and the urea injectors are blocked and are inevitably used and detached from the vehicle, so that the types of the urea injectors in each internal flow channel cleaning can be greatly different, and the device in the patent cannot be suitable for the situation; second, the cleaning performance is poor, and the impurity that part urea sprayer blockked up can be dissolved, consequently, use to soak and add the mode of washing and can wash more cleanly, the soaking clearance of urea sprayer can't be realized to above-mentioned equipment, causes cleaning performance poor and efficiency reduction.

Disclosure of Invention

The utility model aims to provide a cleaning device for an inner runner of a urea injector, which aims to solve the technical problems of low equipment applicability, low cleaning efficiency and poor effect in the prior art.

The utility model provides a cleaning device for an inner runner of a urea injector, which comprises a cleaning water tank, a circulating water pipe and a circulating pump, wherein the opening of the cleaning water tank is upwards arranged, the upper end of the cleaning water tank is provided with a top plate for semi-covering the opening of the cleaning water tank, the circulating pump is arranged in the middle of the circulating water pipe, the circulating pump is positioned at the side of the cleaning water tank, a plurality of water outlet branch pipes communicated with the circulating water pipe are arranged at the water outlet end of the circulating water pipe, the water outlet branch pipes are uniformly distributed on the top plate of the cleaning water tank, a cleaning component is arranged below each water outlet branch pipe, the water outlet branch pipes are communicated with the corresponding cleaning component through a control valve, the rear part of the cleaning component is provided with an adjusting component for automatically adjusting the position of the cleaning component, the front end of the cleaning component is provided with a fixing component for fixing the position of the cleaning component, the lower end of the top plate is provided with a plurality of fixing blocks, the cleaning component, the adjusting component and the fixing component are all installed on the fixing blocks, a mounting cavity is arranged in the fixing block, and one side of the fixing block, which faces the opening of the cleaning water tank and is not sealed by the top plate, is provided with a plugging port for connecting the urea injector, and the port and is communicated with the mounting cavity.

Preferably, the cleaning assembly comprises a first hose, a cleaning adapter and a cleaning connector, wherein the cleaning adapter and the cleaning connector are arranged in the mounting cavity, the cleaning adapter is communicated with one end of the first hose, the other end of the first hose is communicated with the water outlet branch pipe through a control valve, the cleaning connector and the cleaning adapter are integrally connected together, the cleaning connector is inserted into the inserting port and is in sliding fit with the inserting port, and a strip-shaped hole for the cleaning adapter to pass through with the connecting part of the first hose is formed in the side wall of the fixing block.

Preferably, a sealing ring is arranged at one end of the cleaning connector facing the outside of the plug-in connector.

Preferably, the adjusting assembly comprises an adjusting rod, an adjusting piston and an adjusting cylinder, the adjusting cylinder is horizontally arranged in the mounting cavity, one end of the adjusting rod is fixedly connected with the cleaning adapter, the other end of the adjusting rod is fixedly connected with the adjusting piston, the adjusting piston is slidably arranged in the adjusting cylinder, one end of the adjusting cylinder, which is far away from the adjusting rod, is provided with a connecting pipe communicated with the inside of the adjusting cylinder, one end of the connecting pipe, which is far away from the adjusting cylinder, is provided with a buffer storage cylinder, one side of the adjusting piston is provided with a first spring for pushing the adjusting piston to one side of the adjusting rod, and when the adjusting piston is located at one end, closest to the cleaning adapter, of the adjusting cylinder, and the connecting pipe is filled with hydraulic oil.

Preferably, the connecting tube comprises a hard tube portion and a hose portion, the hose portion being arranged folded under the fixing assembly.

Preferably, the fixing assembly comprises a second spring and a U-shaped clamping block, a fixing cavity is arranged in the fixing block, two fixing holes are formed in the fixing block, two ends of the U-shaped clamping block are respectively inserted into the two fixing holes, the second spring is arranged between the U-shaped clamping block and the inner wall of the fixing block to push two ends of the U-shaped clamping block to move outwards through the fixing holes, and the hose portion is folded and arranged between the U-shaped clamping block and the inner wall of the fixing block.

Preferably, a filter screen is arranged in the cleaning water tank, and the joint of the water inlet end of the circulating water pipe and the cleaning water tank is positioned at one side of the filter screen away from the cleaning assembly.

Preferably, the bottom of the cleaning water tank is obliquely arranged, and the position close to the filter screen is the highest point.

Preferably, the cleaning water tank is internally provided with an inflatable bag, the outer wall of the cleaning water tank is provided with a control air pump, and the control air pump is communicated with the inflatable bag.

Compared with the prior art, the utility model has the beneficial effects that:

(1) When the urea injector is installed, the urea injector is only required to be unlocked firstly, then inserted into the plug-in port, and finally locked through the fixing component, the urea injector is simple in fixing mode and convenient to operate, and the urea injector is automatically cleaned after fixing, so that the operation steps are simplified.

(2) The adjusting component can automatically adjust in real time when the urea ejector is inserted into the inserting port, so that the urea ejector with different lengths can be cleaned, and the applicability of the urea ejector is improved.

(3) When the urea injector is installed, the air pump is controlled to fill air into the inflatable bag, so that the liquid level in the cleaning water tank rises, the urea injector is soaked in the cleaning liquid, the part which can be dissolved in the blockage in the urea injector is dissolved, the blocked impurity is loosened, and the subsequent flushing and cleaning are convenient.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is an internal block diagram of the present utility model;

FIG. 3 is a top view of a mounting block of the present utility model;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is an internal structural view of a fixed block according to the present utility model;

fig. 6 is an enlarged view at B in fig. 5.

Reference numerals:

1. cleaning a water pool; 2. a circulating water pipe; 3. a circulation pump; 4. a top plate; 5. a water outlet branch pipe; 6. a control valve; 7. cleaning the assembly; 71. cleaning the adapter; 72. cleaning the connector; 73. a bar-shaped hole; 8. an adjustment assembly; 81. an adjusting rod; 82. an adjusting piston; 83. an adjustment cylinder; 84. a connecting pipe; 841. a hard tube portion; 842. a hose portion; 85. a cache cylinder; 86. a first spring; 9. a fixing assembly; 91. a second spring; 92. a U-shaped clamping block; 93. a fixed cavity; 10. a fixed block; 11. a mounting cavity; 12. an interface; 13. a seal ring; 14. a filter screen; 15. an inflatable bag; 16. and controlling the air pump.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown.

The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The embodiment of the utility model provides a cleaning device for an inner runner of a urea injector, which is shown in the following combined figures 1 to 6, and comprises a cleaning water tank 1, a circulating water pipe 2 and a circulating pump 3, wherein the cleaning water tank 1 is provided with an opening upwards, a top plate 4 for semi-covering the opening of the cleaning water tank 1 is arranged at the upper end of the cleaning water tank 1, the circulating pump 3 is arranged in the middle of the circulating water pipe 2, the circulating pump 3 is positioned at the side of the cleaning water tank 1, a plurality of water outlet branch pipes 5 communicated with the circulating water pipe 2 are arranged at the water outlet end of the circulating water pipe 2, the water outlet branch pipes 5 are uniformly distributed on the top plate 4 of the cleaning water tank 1, a cleaning assembly 7 is arranged below each water outlet branch pipe 5, the water outlet branch pipes 5 are communicated with the corresponding cleaning assembly 7 through a control valve 6, the control valve 6 is used for controlling the communication between the water outlet branch pipes 5 and the cleaning assembly 7, when the urea injector to be cleaned is arranged on the cleaning assembly 7, the control valve is opened, an adjusting assembly 8 for automatically adjusting the position of the cleaning assembly 7 is arranged at the rear part of the cleaning assembly 7, a front end of the cleaning assembly 7 is provided with a fixing assembly 9 for fixing the cleaning assembly 7, a plurality of fixing blocks 10 are arranged at the fixing assembly 7 and are arranged at the fixing assembly 10 and are connected with the fixing assembly 10, and are connected with the fixing assembly 10 and are arranged at one side of the fixing assembly 11, and the fixing assembly 10 is connected with the fixing assembly 10, and the fixing assembly 10 is provided with the fixing assembly 10, and one side is provided with a sealing assembly 11 is provided with a side with a sealing assembly 11.

The utility model is mainly used in repair shops such as repair factories and the like for cleaning the detached and blocked urea ejector inner flow passage, so that the inner flow passage is smooth and the function of the urea ejector inner flow passage is recovered. When the urea injector is specifically used, an operator inserts the disassembled urea injector into the inserting port 12, the position of the cleaning assembly 7 can be automatically adjusted by the adjusting assembly 8 in the inserting process, the urea injector is fixed by the fixing assembly 9, water is supplied by the circulating pump 3, cleaning liquid in the cleaning water tank 1 is injected into the corresponding cleaning assembly 7 through the circulating water pipe 2, the cleaning liquid is introduced into the inner flow passage of the urea injector through the cleaning assembly 7, and impurities are flushed out from the inner flow passage of the urea injector through extrusion while plugs in the inner flow passage of the urea injector are dissolved. When the urea injector is installed, the urea injector is only required to be unlocked firstly, then inserted into the plug-in port 12, and finally locked through the fixing component 9, the urea injector is simple in fixing mode and convenient to operate, automatic cleaning is achieved after fixing is finished, and operation steps are simplified. In addition, the adjusting component 8 in the utility model can automatically adjust in real time when the urea injector is inserted into the insertion port 12, so that the urea injector with different lengths can be cleaned, and the applicability of the urea injector is improved.

Specifically, wash subassembly 7 includes first hose, wash adapter 71 and the washing connector 72 of setting in installation cavity 11, wash adapter 71 and the one end intercommunication of first hose, the other end of first hose passes through control valve 6 and goes out water branch pipe 5 intercommunication, because urea sprayer can move at the in-process of installation and lift, the pliability of first hose can not cause the hindrance to the removal of wasing adapter 71, wash connector 72 and wash adapter 71 integration link together, wash connector 72 pegging graft in the interface 12 and sliding fit between the two, be equipped with the bar hole 73 that supplies wasing adapter 71 and first hose junction to pass on the lateral wall of fixed block 10, when the urea sprayer that the operating personnel will dismantle pegged graft in the interface 12, urea sprayer is contradicted on wash connector 72, runner intercommunication between the two, and because the interference power makes runner and outside form sealedly, the washing liquid enters into wash adapter 71 through going out water branch pipe 5, the rethread washconnector 72 gets into.

Specifically, the end of the cleaning head 72 facing the outside of the socket 12 is provided with a sealing ring 13. Through the setting of sealing washer 13 for when urea sprayer and cleaning connection head 72 contradict, sealing washer 13 can play sealed effect between the two, can make the runner of intercommunication better with external seal.

Specifically, the adjusting assembly 8 includes an adjusting rod 81, an adjusting piston 82 and an adjusting cylinder 83, the adjusting cylinder 83 is horizontally disposed in the mounting cavity 11, one end of the adjusting rod 81 is fixedly connected with the cleaning adapter 71, the other end of the adjusting rod 81 is fixedly connected with the adjusting piston 82, the adjusting piston 82 is slidably disposed in the adjusting cylinder 83, one end of the adjusting cylinder 83, which is far away from the adjusting rod 81, is provided with a connecting pipe 84 communicated with the inside of the adjusting rod, one end of the connecting pipe 84, which is far away from the adjusting cylinder 83, is provided with a buffer cylinder 85, one side of the adjusting piston 82 is provided with a first spring 86 for pushing the adjusting piston 82 to one side of the adjusting rod 81, when the adjusting piston 82 is located at one end of the adjusting cylinder 83 closest to the cleaning adapter 71, the adjusting cylinder 83 and the connecting pipe 84 are filled with hydraulic oil, in a normal state, the adjusting piston 82 is located at one end of the adjusting cylinder 83 closest to the cleaning adapter 71 under the elastic action of the first spring 86, the connecting pipe 84 includes a hard pipe portion 841 and a soft pipe portion 842, and the soft pipe portion 842 is disposed under the fixing assembly 9. When the operator inserts the urea sprayer detached into the plug-in port 12, the urea sprayer abuts against the cleaning connector 72 and pushes the cleaning connector to the rear, so that the cleaning adapter 71, the adjusting rod 81 and the adjusting piston 82 move together, hydraulic oil in the adjusting cylinder 83 is extruded into the buffer cylinder 85, when the urea sprayer is inserted into the plug-in port 12 to be stable, at the moment, the cleaning connector 72 abuts against the urea sprayer under the elastic force of the first spring 86, excessive hydraulic oil is extruded into the buffer cylinder 85, the hose portion 842 is tightly pressed through the fixing assembly 9, the inside of the buffer cylinder 85 is not communicated with the inside of the connecting pipe 84, hydraulic oil cannot flow, and therefore the position of the adjusting piston 82 in the adjusting cylinder 83 can be fixed, and when urea sprayers with different lengths are inserted into the plug-in port 12, the cleaning connector 72 can abut against the urea sprayer with a certain pressure.

Specifically, the fixed subassembly 9 includes second spring 91 and U type fixture block 92, be equipped with fixed cavity 93 in the fixed block 10, be equipped with two fixed orificess on the fixed block 10, peg graft respectively in two fixed orificess at the both ends of U type fixture block 92, second spring 91 sets up between the inner wall of U type fixture block 92 and fixed block 10 in order to promote the both ends of U type fixture block 92 to outwards remove through the fixed orificess, hose portion 842 folding setting is between U type fixture block 92 and fixed block 10 inner wall, during the installation urea sprayer, only need press into U type fixture block 92 to fixed cavity 93 for connecting pipe 84 intercommunication, can install the urea sprayer, loosen U type fixture block 92 after accomplishing the installation, make U type fixture block 92 stretch out under the elasticity effect of second spring 91, with the feed liquor end restriction of urea sprayer in grafting mouth 12 can, convenient operation, succinctness.

Specifically, the filter screen 14 is arranged in the cleaning water tank 1, and the connection part of the water inlet end of the circulating water pipe 2 and the cleaning water tank 1 is positioned at one side of the filter screen 14 away from the cleaning assembly 7. The cleaning liquid entering the circulation is filtered once through the filter screen 14, so that impurities are prevented from entering the urea injector, and further blockage of a flow passage in the urea injector is avoided.

Specifically, the bottom of the cleaning water tank 1 is inclined, and the position close to the filter screen 14 is the highest point, so that the precipitated impurities flow to the lowest point, and the cleaning liquid enters the circulating water pipe 2 after being filtered by the filter screen 14 from the highest point, so that the pressure of the filter screen 14 is reduced as much as possible.

Specifically, be equipped with the air inflation bag 15 in the wash pond 1, the outer wall in wash pond 1 is equipped with control air pump 16, control air pump 16 and air inflation bag 15 intercommunication, after the urea sprayer installs, can be through control air pump 16 to the air inflation bag 15 intussuseption filling gas to make the liquid level rise in the wash pond 1, its purpose is with the urea sprayer soak in the washing liquid, make the part that can dissolve in the inside plug of urea sprayer dissolve, also can make the impurity of jam become flexible, the going on of the follow-up washing clearance of being convenient for.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. The utility model provides a belt cleaning device of runner in urea sprayer, includes cleaning water pond (1), circulating pipe (2) and circulating pump (3) that the opening upwards set up, its characterized in that: the utility model discloses a urea spraying device, which is characterized in that a top plate (4) for semi-covering an opening of a cleaning pool (1) is arranged at the upper end of the cleaning pool (1), a circulating pump (3) is arranged in the middle of a circulating water pipe (2), the circulating pump (3) is positioned at the side of the cleaning pool (1), a plurality of water outlet branch pipes (5) communicated with the circulating water pipe are arranged at the water outlet end of the circulating water pipe (2), the water outlet branch pipes (5) are uniformly distributed on the top plate (4) of the cleaning pool (1), cleaning components (7) are arranged below each water outlet branch pipe (5) and are communicated with the corresponding cleaning components (7) through control valves (6), an adjusting component (8) for automatically adjusting the position of the cleaning components (7) is arranged at the rear part of the cleaning components (7), a fixing component (9) for fixing the position of the cleaning components (7) is arranged at the front end of the cleaning components (7), a plurality of fixing blocks (10) are arranged at the lower end of the top plate (4), the cleaning components (7), the adjusting components (8) and the fixing components (9) are uniformly distributed on the top plate (4), the fixing blocks (10) are arranged on the fixing blocks, the fixing blocks (10) and are arranged at the front end of the cleaning components (7) and are arranged at the fixing blocks (10) and are arranged at the positions of the fixing blocks, and are arranged on the fixing blocks (12) respectively, and are arranged on the front side of the cleaning components (12, the plug-in port (12) is communicated with the mounting cavity (11).

2. The cleaning apparatus for a flow path in a urea injector of claim 1, wherein: the cleaning assembly (7) comprises a first hose, a cleaning adapter (71) and a cleaning connector (72) which are arranged in the installation cavity (11), wherein the cleaning adapter (71) is communicated with one end of the first hose, the other end of the first hose is communicated with the water outlet branch pipe (5) through a control valve (6), the cleaning connector (72) is integrally connected with the cleaning adapter (71), the cleaning connector (72) is inserted into the insertion port (12) and is in sliding fit with the insertion port, and a strip-shaped hole (73) for the cleaning adapter (71) to penetrate through with the joint of the first hose is formed in the side wall of the fixed block (10).

3. The cleaning apparatus for an internal flow passage of a urea injector as set forth in claim 2, wherein: one end of the cleaning connector (72) facing the outside of the plug-in connector (12) is provided with a sealing ring (13).

4. The cleaning apparatus for an internal flow passage of a urea injector as set forth in claim 2, wherein: the utility model provides a hydraulic oil adjusting device, including adjusting subassembly (8), including adjusting pole (81), adjusting piston (82) and adjusting cylinder (83), adjusting cylinder (83) level sets up in installation cavity (11), the one end and the washing adapter (71) fixed connection of adjusting pole (81), the other end and the adjusting piston (82) fixed connection of adjusting pole (81), adjusting piston (82) slip sets up in adjusting cylinder (83), adjusting cylinder (83) keep away from adjusting pole (81) one end be equipped with rather than connecting pipe (84) of inside intercommunication, connecting pipe (84) keep away from adjusting cylinder (83) one end be equipped with buffer memory section of thick bamboo (85), one side of adjusting piston (82) is equipped with and is used for adjusting piston (82) to one side promotion of adjusting pole (81) first spring (86), when adjusting piston (82) are located adjusting cylinder (83) and are close to the one end of wasing adapter (71), adjust cylinder (83) and connecting pipe (84) intussuseption are filled with hydraulic oil.

5. The cleaning apparatus for an internal flow path of a urea injector as set forth in claim 4, wherein: the connecting pipe (84) comprises a hard pipe part (841) and a hose part (842), and the hose part (842) is arranged below the fixing assembly (9) in a folding way.

6. The cleaning apparatus for a flow path in a urea injector of claim 5, wherein: the fixing assembly (9) comprises a second spring (91) and a U-shaped clamping block (92), a fixing cavity (93) is formed in the fixing block (10), two fixing holes are formed in the fixing block (10), two ends of the U-shaped clamping block (92) are respectively inserted into the two fixing holes, the second spring (91) is arranged between the U-shaped clamping block (92) and the inner wall of the fixing block (10) so as to push the two ends of the U-shaped clamping block (92) to move outwards through the fixing holes, and the hose portion (842) is folded and arranged between the U-shaped clamping block (92) and the inner wall of the fixing block (10).

7. The cleaning apparatus for a flow path in a urea injector of claim 1, wherein: the inside filter screen (14) that is equipped with of washing pond (1), the junction of intake end and the washing pond (1) of circulating water pipe (2) is located one side that the washing subassembly (7) was kept away from to filter screen (14).

8. The cleaning apparatus for a flow path in a urea injector of claim 7, wherein: the bottom of the cleaning water tank (1) is obliquely arranged, and the position close to the filter screen (14) is the highest point.

9. The cleaning apparatus for a flow path in a urea injector of claim 1, wherein: an inflatable bag (15) is arranged in the cleaning water tank (1), a control air pump (16) is arranged on the outer wall of the cleaning water tank (1), and the control air pump (16) is communicated with the inflatable bag (15).