Injector flow test apparatus

Abstract

The application discloses a kind of injector liquid flow test equipment, including feeding assembly, injection flow component, and detection component, wherein feeding assembly is moved by first horizontal movement module in feeding manipulator, grabs the injector on feeding carrier plate, and the model piece on carrier plate is identified by scanning code head, injection flow component is provided with multiple positioning injection flow structures along the length direction of test table, is adapted to different models of injector, clamping plate is clamped workpiece by driving rod and rotating unit, and moving unit drives injection flow block to make water outlet port butt joint injector water inlet end, injection flow pipe supplies liquid, in detection component, detection camera is driven multi-angle movement by detection manipulator and second horizontal movement module, towards water end and is photographed, and drying oven is provided above for drying camera.

Description

Technical Field

[0001] This invention relates to the field of injector testing equipment technology, and specifically to an injector fluid flow testing device. Background Technology

[0002] The injector is a key component in fuel injection systems and other devices. Its function is to atomize and mix fuel with oxidizer or air and inject it into the combustion chamber. The unobstructed flow channels inside the injector, the consistency of flow rate in each nozzle, and the uniformity of the spray pattern directly determine the engine's combustion efficiency, operational stability, and reliability. Therefore, after the injector is manufactured, rigorous fluid flow testing must be conducted to verify whether its fluid flow characteristics meet the design specifications.

[0003] Currently, traditional injector flow testing mostly adopts a single-station, single-model testing method. The testing equipment is usually equipped with only one set of fixed fixtures and flow connectors. These fixtures and connectors can only be adapted to a specific model of injector. When it is necessary to test different models of injectors (such as different sizes, different interface forms, or different flow channel layouts), the operator must manually replace the corresponding fixtures, sealing connectors, and pipelines, and readjust the position parameters of the test bench. The entire replacement and debugging process is time-consuming and cumbersome, which seriously affects the testing efficiency.

[0004] Furthermore, during the testing process, the atomization pattern or flow rate of the water spraying end of the injector is usually observed manually. The judgment criteria are highly subjective, making it difficult to achieve quantitative and consistent test results. Moreover, the test data of different injector models are scattered, which is not conducive to quality traceability and statistical analysis. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention proposes a liquid flow testing device for injectors.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A liquid flow testing device for an injector includes a feeding assembly, a flow injection assembly, and a testing assembly; The feeding assembly includes a feeding plate for placing the injector, a feeding machine for placing the feeding plate, a feeding robot for gripping the injector, and a first transverse module for driving the feeding robot to move along the length of the injection assembly. The feeding plate is provided with a model plate, and the feeding machine is provided with a scanning dock for identifying the model plate. The injection assembly includes a test stand and several positioning injection structures spaced along the length of the test stand for detecting different types of injectors. The positioning injection structure includes a clamping and positioning part and an injection part. The clamping and positioning part includes a clamping plate for clamping the injector, a drive rod for driving the clamping plate to move closer or further away, and a rotating unit for driving the drive rod to rotate. The injection part includes an injection block, an injection pipe inserted into the injection block, and a moving unit for driving the injection block to move toward the injector. The injection block is provided with an outlet hole that connects to the water inlet end of the injector. The detection assembly includes a detection camera, a detection robot that drives the detection camera to move at multiple angles, and a second lateral movement module that drives the detection robot to move laterally along the length of the test platform. The detection camera is positioned facing the water spray end of the injector, and a drying box for drying the detection camera is provided above the detection robot.

[0007] Preferably, the loading platform is provided with a positioning block, which forms a positioning groove for placing the loading plate. A contact fixing block for abutting the loading plate is slidably disposed on the loading platform, along with a pushing unit for driving the contact fixing block to move. Through these improvements, when placing the loading plate, the positioning groove can initially position the loading plate in the horizontal direction, preventing it from shifting during testing. After the loading plate is placed in the positioning groove, the pushing unit actuates, driving the contact fixing block to slide towards the loading plate, making it tightly abut against the side wall of the loading plate, thereby firmly locking the loading plate in the positioning groove. This effectively eliminates any slight movement of the loading plate in the vertical or lateral direction, significantly improving the placement stability and repeatability of the loading plate on the loading platform, ensuring the consistency of the position when the loading robot grabs the injector each time, and thus improving the reliability of subsequent injection connection.

[0008] Preferably, the feeding machine platform is equipped with a dust blowing structure, which includes a blowing unit and a dust blowing pipe connected to the blowing unit. The dust blowing pipe is oriented towards the feeding carrier plate. With the above improvements, when the feeding carrier plate is placed on the feeding machine platform, the blowing unit is activated, and high-pressure gas is blown through the dust blowing pipe onto the surface of the feeding carrier plate and the placed injector, effectively removing dust, debris, or residual liquid droplets adhering to the outer wall of the injector, the interface area, and the feeding carrier plate. This enables automatic cleaning of the injector before it enters the injection test, preventing foreign objects from clogging the injector flow channel or affecting the sealing accuracy between the water outlet of the injection section and the water inlet of the injector, thereby reducing test errors and improving the reliability and consistency of test results.

[0009] Preferably, the moving end of the feeding robot is connected to a feeding gripper, and a type-changing plate is provided on the feeding machine platform. The type-changing plate has several feeding grippers for holding different models of injectors. The feeding grippers include a quick-change head for connecting to the feeding robot and a gripping unit provided on the quick-change head. With the above improvements, when it is necessary to switch to test different models of injectors, the feeding robot automatically moves to the top of the type-changing plate, releases the current gripper through the quick-change head, and grabs the feeding gripper that matches the model of the injector to be tested. This achieves rapid and automatic gripper replacement without manual replacement of the clamps. The same feeding robot can be compatible with the gripping tasks of injectors with various shapes and sizes, effectively reducing the downtime waiting time when testing multiple types of injectors in a mixed line.

[0010] Preferably, a sealing ring is provided on the outer periphery of the water outlet, and the sealing ring abuts against the injector. With the above improvement, when the moving unit drives the injection block to move toward the injector, so that the water outlet is connected with the water inlet end of the injector, the sealing ring is pressed between the injection block and the water inlet end face of the injector, forming a circumferential seal, which effectively prevents the high-pressure test liquid from leaking from the joint gap between the water outlet and the water inlet end of the injector.

[0011] Preferably, the test bench is equipped with a water collection tank. With the above improvements, after the injector completes the liquid flow test, the sprayed water or test liquid will fall into the water collection tank and be discharged or recycled through the drain outlet or return water pipe at the bottom of the tank. This avoids the test liquid from accumulating on the surface of the test bench or splashing everywhere, effectively maintaining the cleanliness of the equipment and working environment.

[0012] Preferably, the drive rod is provided with a first threaded section and a second threaded section, and the first threaded section and the second threaded section have opposite thread directions. The clamping plates are respectively disposed on the first threaded section and the second threaded section. Through the above improvements, since the first threaded section and the second threaded section have opposite thread directions, the two clamping plates will move synchronously towards each other or synchronously away from each other along the axis of the drive rod, realizing bidirectional synchronous clamping to improve the reliability of the injector fixation.

[0013] Preferably, a flow detector is inserted into the injection tube. Through the above improvements, the flow rate of the test liquid flowing into the injector is monitored in real time. The flow detector transmits the detection signal to the control system of the equipment and compares it with the preset standard flow range to determine whether there are defects such as blockage, leakage or abnormal flow in the internal flow channel of the injector.

[0014] Preferably, a light-blocking plate is provided on the test platform, and the light-blocking plate is located on both sides of the water outlet end of the injector. Through the above improvements, the ambient light from the side can be effectively blocked, so that the detection camera can obtain uniform and stable lighting conditions, and significantly improve the contrast and clarity of image acquisition.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: By setting model plates on the loading plate and using a scanning dock to automatically identify the model, combined with multiple positioning injection structures spaced along the length of the test bench, compatibility testing of different models of injectors is achieved. The test model can be quickly switched without frequent fixture changes, which significantly improves testing efficiency and equipment utilization. Furthermore, by driving the detection camera to move at multiple angles through the detection robot and the second lateral movement module, images of the water spray end of the injector can be acquired, replacing traditional manual visual judgment and improving the accuracy and traceability of the test results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the feeding machine of the present invention; Figure 3 This is a schematic diagram of the loading robot of the present invention; Figure 4 This is a schematic diagram of the positioning injection structure of the present invention; Figure 5 This is a schematic diagram of the detection component of the present invention; Figure 6 This is a schematic diagram of the drying oven of the present invention; Figure 7 This is a schematic diagram of the injection block of the present invention; In the diagram: 1. Feeding assembly; 2. Injection assembly; 3. Detection assembly; 101. Feeding carrier plate; 102. Feeding machine; 103. Feeding robot; 104. First transverse module; 105. Model plate; 106. Sweeping dock; 107. Feeding detection camera; 201. Test stand; 202. Positioning injection structure; 203. Clamping and positioning part; 204. Injection part; 205. Clamping plate; 206. Drive rod; 207. Rotation unit; 208. Injection block; 209. Injection pipe; 210. Moving unit; 211. Outlet 301. Water hole; 302. Detection camera; 303. Detection robot arm; 304. Second transverse movement module; 405. Positioning block; 406. Positioning groove; 407. Abutment fixing block; 408. Pushing unit; 509. Dust blowing structure; 500. Air blowing unit; 500. Dust blowing pipe; 601. Feeding gripper; 602. Shape changing plate; 603. Quick change head; 604. Clamping unit; 605. Abutment sealing ring; 606. Water collection tank; 607. Flow detector; 608. Light blocking plate; 609. Drying oven; 610. Finished product unloading plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0019] like Figure 1-7 As shown, a liquid flow testing device for an injector includes a feeding assembly 1, an injection assembly 2, and a testing assembly 3.

[0020] Specifically, the feeding assembly 1 includes a feeding carrier plate 101 for placing the injector, a feeding machine 102 for placing the feeding carrier plate 101, a feeding robot 103 for gripping the injector, and a first transverse module 104 for driving the feeding robot 103 to move along the length direction of the injection assembly 2. The feeding carrier plate 101 is provided with a model plate 105, and the feeding machine 102 is provided with a sweeping dock 106 for identifying the model plate 105, so as to realize the identification of different models of injectors.

[0021] Furthermore, the injection assembly 2 includes a test platform 201 and several positioning injection structures 202 spaced along the length of the test platform 201 for detecting different types of injectors. The positioning injection structure 202 includes a clamping and positioning part 203 and an injection part 204. The clamping and positioning part 203 includes a clamping plate 205 for clamping the injector, a drive rod 206 for driving the clamping plate 205 to move closer or further away from each other, and a rotating unit 207 for driving the drive rod 206 to rotate. The drive rod 206 is provided with a first threaded section and a second threaded section, and the first threaded section and the second threaded section have opposite thread directions. The clamping plate 205 is respectively provided on the first threaded section and the second threaded section. Since the first threaded section and the second threaded section have opposite thread directions, the two clamping plates 205 will move closer or further away from each other synchronously along the axis of the drive rod 206, realizing bidirectional synchronous clamping to improve the reliability of injector fixation.

[0022] The injection section 204 includes an injection block 208, an injection pipe 209 inserted on the injection block 208, and a moving unit 210 that drives the injection block to move toward the injector. The injection block is provided with an outlet hole 211 that connects with the water inlet of the injector.

[0023] The detection component 3 includes a detection camera 301, a detection robot 302 that drives the detection camera 301 to move at multiple angles, and a second lateral movement module 303 that drives the detection robot 302 to move laterally along the length of the test table 201. The detection camera 301 is positioned facing the water spray end of the injector to identify and detect the spray pattern of the injector. A drying chamber 609 for drying the detection camera 301 is provided above the detection robot 302. The air outlet of the drying chamber 609 can heat and dry the camera lens, effectively removing the water vapor condensed on the surface and inside, and ensuring that the detection camera 301 remains dry and clear during long-term continuous testing.

[0024] Throughout the testing process, the operator places the injector to be tested onto the loading plate 101 and positions the loading plate 101, which in turn positions it at a predetermined location on the loading platform 102. The sweeping terminal 106 on the loading platform 102 automatically reads the model information 105 set on the loading plate 101 to obtain the model of the injector in the current batch. Based on the identified model, the control system drives the first lateral movement module 104 to move the loading robot 103 above the loading plate 101. The loading robot 103 descends and grasps the injector using the loading gripper 601. After grasping, the first lateral movement module 104 continues to drive the loading robot 103 to move above the corresponding test station of the injection assembly 2. The loading robot 103 places the injector on the test table 201 at the positioning injection structure 202 corresponding to the injector model. The rotating unit 207 drives the drive rod 206 to rotate, and the two clamping plates 205 synchronously move closer to each other, clamping and fixing the injector at the test station. At the center position, after the injector is clamped and fixed, the moving unit 210 drives the injection block 208 to move toward the injector, so that the water outlet 211 on the injection block 208 is in close contact with the water inlet end of the injector. The test liquid enters the internal flow channel of the injector through the injection pipe 209, the injection block 208 and the water outlet 211. After passing through the flow channel of the injector, the test liquid is sprayed out from the spray end of the injector. At the same time as the injector sprays water, the second transverse module 303 drives the detection robot 302 along the length of the test table 201. The direction of movement allows the detection camera 301 at the action end of the detection robot 302 to reach the front of the water spray end of the sprayer. The detection robot 302 can adjust the position and posture of the detection camera 301 at multiple angles so that the detection camera 301 always faces the water spray end of the sprayer. The detection camera 301 collects images of the spray pattern, water jet angle and distribution uniformity of the water spray end, and transmits the image data to the control system for analysis and judgment. After the test is completed, the material is unloaded by the loading robot 103.

[0025] This application achieves compatibility testing of different models of injectors by setting a model plate 105 on the loading plate 101 and cooperating with the sweeping dock 106 to automatically identify the model. Combined with multiple positioning and injection structures 202 corresponding to different models arranged at intervals along the length of the test bench 201, it can quickly switch test models without frequent fixture changes, which significantly improves testing efficiency and equipment utilization. It adopts an automated docking method in which the clamping and positioning part 203 and the injection part 204 cooperate. The drive rod 206 drives the clamping plate 205 to achieve adaptive clamping of the injector, and the moving unit 210 drives the injection block 208 to automatically dock the water outlet 211 with the water inlet of the injector. This ensures the positioning accuracy and sealing reliability of different models of injectors during the testing process and avoids errors caused by manual operation.

[0026] In addition, by driving the detection camera 301 to move at multiple angles through the detection robot 302 and the second transverse module 303, the water spray end of the injector can be automatically, clearly and consistently captured, replacing the traditional manual visual judgment and improving the objectivity and traceability of the detection results.

[0027] like Figures 1 to 3 As shown, as a further explanation of the specific structure of the feeding assembly 1, the feeding machine 102 is provided with a positioning block 401, the positioning block 401 is configured with a positioning groove 402 for placing the feeding carrier plate 101, and the feeding machine 102 is slidably provided with an abutting fixing block 403 for abutting the feeding carrier plate 101, and a pushing unit 404 for driving the abutting fixing block 403 to move.

[0028] When the loading plate 101 is placed, the positioning groove 402 can initially position the loading plate 101 in the horizontal direction to prevent it from shifting during the test. After the loading plate 101 is placed in the positioning groove 402, the pushing unit 404 is activated, driving the abutment fixing block 403 to slide towards the loading plate 101, so that it tightly abuts against the side wall of the loading plate 101, thereby firmly locking the loading plate 101 in the positioning groove 402. This effectively eliminates the slight movement of the loading plate 101 in the vertical or lateral direction, greatly improving the placement stability and repeatability of the loading plate 101 on the loading machine 102, ensuring the consistency of the position of the loading robot 103 when it grabs the injector each time, and thus improving the reliability of subsequent injection docking.

[0029] Furthermore, a dust-blowing structure 501 is provided on the feeding platform 102. The dust-blowing structure 501 includes a blowing unit 502 and a dust-blowing pipe 503 connected to the blowing unit 502. The dust-blowing pipe 503 is positioned towards the feeding carrier plate 101. When the feeding carrier plate 101 is placed on the feeding platform 102, the blowing unit 502 is activated. High-pressure gas is blown through the dust-blowing pipe 503 onto the surface of the feeding carrier plate 101 and the placed injector, effectively removing dust, debris, or residual liquid droplets adhering to the outer wall of the injector, the interface, and the feeding carrier plate 101. This enables automatic cleaning of the injector before it enters the injection test, preventing foreign objects from clogging the injector's flow channel or affecting the sealing accuracy between the water outlet 211 of the injection section 204 and the water inlet of the injector, thereby reducing test errors and improving the reliability and consistency of test results.

[0030] In addition, the moving end of the loading robot 103 is connected to the loading gripper 601, and the loading platform 102 is provided with a changing plate 602. The changing plate 602 is provided with a number of loading grippers 601 for holding different types of injectors. The loading gripper 601 includes a quick change head 603 for connecting to the loading robot 103, and a clamping unit 604 provided on the quick change head 603.

[0031] When it is necessary to switch to test different models of injectors, the loading robot 103 automatically moves above the model change plate 602, releases the current gripper through the quick change head 603 and grabs the loading gripper 601 that matches the model of the injector to be tested, realizing the rapid and automatic change of grippers. Without the need for manual change of clamps, the same loading robot 103 can be compatible with the gripping tasks of injectors of various shapes and sizes, effectively reducing the downtime waiting time when testing multiple types of injectors in a mixed line.

[0032] The feeding robot 103 has a connector at its actuating end that mates with the quick-change head 603. The quick-change head 603 is a conventional technical means in the use of robots, so its specific structure will not be described in detail.

[0033] Preferably, the feeding machine 102 is also equipped with a finished product unloading plate 610. After the injector completes the liquid flow test and is determined to be a qualified product by the detection component 3, the feeding robot 103 picks up the tested injector from the test table 201 and moves it to the finished product unloading plate 610 for placement. This achieves separate placement of qualified products and products to be tested, avoiding confusion or repeated testing caused by mixing tested and untested injectors.

[0034] Preferably, the loading robot 103 is also equipped with a loading detection camera 301107 on its motion end. When gripping the injector, the loading detection camera 301107 can determine the position of the injector and the number of injectors on the loading carrier 101. This not only improves the accuracy of gripping, but also determines whether the orientation of each injector is consistent with the preset gripping posture. If an injector is found to be misplaced or has an abnormal posture, the system can automatically skip the injector and record the abnormal information, or prompt the operator to reposition it and prompt the operator to load the missing material.

[0035] like Figure 1 , Figure 4 , Figure 7 As shown, as a further explanation of the implementation of the injection block 208 and the injector, the moving end of the moving unit 210 is provided with a moving bracket, and the injection pipe 209 is inserted into the moving bracket. The injection block 208 is placed on the moving bracket, and the injection pipe 209 is inserted into the water inlet hole of the injection block 208.

[0036] Specifically, an abutment sealing ring 605 is provided on the outer periphery of the water outlet 211. The abutment sealing ring 605 abuts against the injector. When the moving unit 210 drives the injection block 208 to move toward the injector, so that the water outlet 211 is connected with the water inlet end of the injector, the abutment sealing ring 605 is pressed between the injection block 208 and the water inlet end face of the injector, forming a circumferential seal, which effectively prevents the high-pressure test liquid from leaking from the joint gap between the water outlet 211 and the water inlet end of the injector.

[0037] The injection pipe 209 is equipped with a flow detector 607, which monitors the flow rate of the test liquid flowing into the injector in real time. The flow detector 607 transmits the detection signal to the control system of the equipment and compares it with the preset standard flow range to determine whether there are defects such as blockage, leakage or abnormal flow in the internal flow channel of the injector.

[0038] Preferably, the movable bracket has a positioning pin, and the injection block 208 has an insertion hole for insertion, so as to achieve precise installation of the injection block 208.

[0039] In addition, a water collection tank 606 is provided on the test bench 201. After the sprayer completes the liquid flow test, the sprayed water or test liquid will fall into the water collection tank 606 and be discharged or recycled through the drain outlet or return water pipe at the bottom of the tank. This avoids the test liquid from accumulating on the surface of the test bench 201 or splashing everywhere, effectively maintaining the cleanliness of the equipment and working environment.

[0040] Preferably, a light-blocking plate 608 is provided on the test stand 201, and the light-blocking plate 608 is located on both sides of the water outlet end of the injector. It can effectively block ambient stray light from the side, so that the detection camera 301 can obtain uniform and stable lighting conditions, significantly improving the contrast and clarity of image acquisition.

[0041] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A device for testing the liquid flow of an injector, characterized in that, It includes a feeding assembly (1), a flow injection assembly (2), and a detection assembly (3); The feeding assembly (1) includes a feeding plate (101) for placing the injector, a feeding machine (102) for placing the feeding plate (101), a feeding robot (103) for gripping the injector, and a first transverse module (104) for driving the feeding robot (103) to move along the length direction of the injection assembly (2). The feeding plate (101) is provided with a model plate (105), and the feeding machine (102) is provided with a sweeping dock (106) for identifying the model plate (105). The injection assembly (2) includes a test stand (201) and several positioning injection structures (202) spaced along the length of the test stand (201) for detecting different types of injectors. The positioning injection structure (202) includes a clamping positioning part (203) and an injection part (204). The clamping positioning part (203) includes a clamping plate (205) for clamping the injector, a driving rod (206) for driving the clamping plate (205) to move closer or further away, and a rotating unit (207) for driving the driving rod (206) to rotate. The injection part (204) includes an injection block (208), an injection pipe (209) inserted on the injection block (208), and a moving unit (210) for driving the injection block (208) to move toward the injector. The injection block (208) is provided with an outlet hole (211) that connects with the water inlet of the injector. The detection component (3) includes a detection camera (301), a detection robot (302) that drives the detection camera (301) to move at multiple angles, and a second lateral movement module (303) that drives the detection robot (302) to move laterally along the length of the test table (201). The detection camera (301) is positioned facing the water spray end of the injector, and a drying box (609) for drying the detection camera (301) is provided above the detection robot (302).

2. The injector flow testing device according to claim 1, characterized in that: The loading platform (102) is provided with a positioning block (401), the positioning block (401) is provided with a positioning groove (402) for placing the loading plate (101), and the loading platform (102) is provided with a contact fixing block (403) for contacting the loading plate (101), and a pushing unit (404) for driving the contact fixing block (403) to move.

3. The injector flow testing device according to claim 1, characterized in that: The feeding machine (102) is provided with a dust blowing structure (501), which includes a blowing unit (502) and a dust blowing pipe (503) connected to the blowing unit (502). The dust blowing pipe (503) is arranged facing the feeding carrier plate (101).

4. The injector flow testing device according to claim 1, characterized in that: The feeding robot (103) is connected to a feeding gripper (601) at its actuating end. The feeding machine (102) is provided with a changing plate (602). The changing plate (602) is provided with a plurality of feeding grippers (601) for holding different types of injectors. The feeding gripper (601) includes a quick-change head (603) for connecting to the feeding robot (103) and a clamping unit (604) provided on the quick-change head (603).

5. The injector flow testing device according to claim 1, characterized in that: The water outlet (211) is provided with an abutment sealing ring (605) on its outer periphery, and the abutment sealing ring (605) abuts against the injector.

6. The injector flow testing device according to claim 1, characterized in that: A water collection tank (606) is provided on the test stand (201).

7. The injector flow testing device according to claim 1, characterized in that: The drive rod (206) is provided with a first threaded section and a second threaded section, and the first threaded section and the second threaded section have opposite thread directions. The clamping plate (205) is respectively provided on the first threaded section and the second threaded section.

8. The injector flow testing device according to claim 1, characterized in that: A flow detector (607) is inserted into the injection pipe (209).

9. The injector flow testing device according to claim 1, characterized in that: A light-blocking plate (608) is provided on the test stand (201), and the light-blocking plate (608) is located on both sides of the water outlet end of the injector.

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