Method and equipment for assembling water pump

Abstract

The invention relates to a water pump assembling method and equipment, and relates to the technical field of pump body assembly.The water pump assembling method comprises the following steps that a bearing is installed on a pump shaft, a shaft pin is installed in a pin hole of the pump shaft, the pump shaft is installed on a lower shell, and an engine side positioning pin is installed on the lower shell; an oil seal and an outer sealing ring are installed on a lower shell, the airtightness of a cavity formed by the oil seal, the outer sealing ring and an engine is detected through an airtightness detector, a water seal is installed on the lower shell, an impeller is installed on the lower shell, and a special-shaped sealing ring, a thermostat, a positioning pin and a water pump cover are installed on the lower shell. And detecting the air tightness between the water seal and the lower shell by using an air tightness detector, and detecting the air tightness between the special-shaped sealing ring and the lower shell as well as between the special-shaped sealing ring and the water pump cover by using the air tightness detector. The overall assembly and sealing structure of the water pump is perfected, and comprehensive air tightness detection is combined, so that the water pump can stably operate under various working conditions.

Description

Technical Field

[0001] This application relates to the technical field of pump body assembly, and in particular to an assembly method and equipment for a water pump. Background Art

[0002] During the assembly process of a water pump, the traditional assembly process mainly relies on manual operation. The assembly situation of components is initially judged by visual inspection, feel judgment, etc., and then simple tools such as screwdrivers and wrenches are used for fastening and adjustment.

[0003] When installing a bearing, it is usually pressed into the shaft body by workers based on experience, and it is difficult to ensure the consistency of the pressing depth and fitting accuracy; when installing a pump shaft pin, the pulling force and symmetry of the pump shaft pin are not controlled accurately enough, which may cause looseness or imbalance of the shaft assembly during operation; for the sealing treatment of the water pump, the traditional method is mainly to add sealant or use a simple sealing gasket during the assembly process, and the detection means for the sealing effect are relatively limited. Summary of the Invention

[0004] In order to improve the installation accuracy of a water pump, this application provides an assembly method and equipment for a water pump.

[0005] In a first aspect, this application provides an assembly method for a water pump, adopting the following technical solutions: An assembly method for a water pump, comprising the following steps: S1: Install the bearing on the pump shaft and perform press-fitting to ensure that the bearing is perpendicular to the pump shaft, the gap is uniform, without deformation or damage; S2: Install the shaft pin into the pin hole of the pump shaft and perform press-fitting to ensure that the shaft pin is without damage or deformation; S3: Install the pump shaft on the lower housing and perform press-fitting to ensure that the bearing is flush with the lower housing, without deformation or damage; S4: Install the engine side locating pin on the lower housing and perform press-fitting to ensure that the engine side locating pin is perpendicular to the lower housing, without deformation or damage; S5: Install the oil seal and outer sealing ring on the lower housing and perform press-fitting to ensure that the oil seal is ±0.5 mm from the end face of the lower housing, without damage or deformation; S6: Use an airtight detector to detect the airtightness between the cavity formed by the oil seal and outer sealing ring and the engine, and ensure that the leakage amount ≤ 10 ml; S7: Install the water seal on the lower housing and perform press-fitting to ensure that the edge position of the water seal closely adheres to the installation end face of the lower housing, without gaps or deformation; S8: Install the impeller on the lower housing and perform press-fitting to ensure that there is a 1 ± 0.4 mm gap between the impeller and the lower housing, without damage or deformation; S9: Install the special-shaped sealing ring, thermostat, positioning pin and water pump cover onto the lower housing, and use an electric screwdriver to lock the screws, ensuring that there is no wobbling between the lower housing and the water pump cover and the gap is uniform. S10: Use an airtight detector to detect the airtightness between the water seal and the lower housing, ensuring that the leakage rate ≤ 2 ml / min. S11: Use an airtight detector to detect the airtightness between the special-shaped sealing ring and the lower housing and the water pump cover respectively, ensuring that the leakage rate ≤ 1 ml / min.

[0006] By adopting the above technical solutions, the tight fit between the pump shaft and the bearing is ensured, preventing the shaft body from displacing or loosening during operation, ensuring the transmission accuracy and reliability of the pump shaft, accurately installing the pump shaft into the lower housing, while ensuring the smooth rotation of the pump shaft, achieving the precise positioning connection between the lower housing and the engine side positioning pin. The setting of the oil seal effectively prevents the leakage of the medium inside the water pump, and the airtight detector can timely detect the airtightness problem on the oil seal side.

[0007] Optionally, step S2 includes the following steps: S2.1: Press the fixture locking rocker, insert the end of the pump shaft with the pin hole into the fixture, release the locking rocker, rotate the pump shaft, and after the positioning pin of the locking rocker inserts into the pin hole of the pump shaft, it automatically locks and the pump shaft cannot rotate. S2.2: Vertically place the shaft pin into the fixture positioning hole and ensure that it is installed in place without skew. S2.3: Then start stamping. After stamping is completed, take out the workpiece and check it. S2.4: Use a gauge to check the length of the shaft pin protruding from both sides of the pump shaft. For qualified products, mark both ends of the shaft pin, and the mark needs to connect the shaft pin and the pump shaft.

[0008] By adopting the above technical solutions, the structural stability of the shaft assembly can be enhanced, preventing the shaft body from displacing or loosening during operation, ensuring the transmission accuracy and reliability of the pump shaft, and at the same time, by controlling the pull-off force and symmetry of the shaft pin, ensuring its firmness under high-load working conditions.

[0009] Optionally, step S5 includes the following steps: S5.1: Install the oil seal onto the oiling tooling with the opening facing inward, and push it to the bottom to fit the fixture for positioning. S5.2: Hold the oil seal and press the oil squeezing switch. After the oil seal rotates one circle, slowly take it out and check that the inner cavity of the oil seal is evenly oiled throughout the whole circumference without accumulation or local lack of oil. S5.3: Install the oil seal with the opening facing downward onto the guide sleeve and roll it on the printing table for two circles to apply engine oil, ensuring that the outer circle of the oil seal is evenly coated with engine oil. S5.4: Put the guide sleeve onto the end of the pump shaft, and use a rubber sleeve to push the oil seal to the bottom. After completion, take out the guide sleeve and place it at a fixed position. S5.5: Place the lower housing at the tooling positioning location, press the start button to start stamping. After stamping is completed, take out the workpiece for inspection and mark the defective parts at the defective locations. S5.6: Test the press-fitting effect. Rotate the pump shaft one full turn in both the forward and reverse directions. It is required that the rotation is smooth without jamming. Install the outer sealing ring into the lower housing.

[0010] By adopting the above technical solutions, it effectively prevents the leakage of the internal medium of the water pump, while preventing external impurities and moisture from entering the water pump, protecting the internal components from contamination and damage, extending the service life of the water pump, and ensuring the stability and reliability of the sealing effect by precisely controlling the installation position and the amount of oil injection of the oil seal.

[0011] Optionally, step S6 includes the following steps: S6.1: Rotate the pump shaft one full turn in both the forward and reverse directions. It is required that the rotation is smooth without jamming. Flip the lower housing and check that the oil seal is not installed backwards. S6.2: Place the end of the lower cover with the shaft pin facing down into the tooling positioning hole. S6.3: Press the start button. The tooling clamps the workpiece and starts the detection to detect the airtightness between the oil seal, the outer sealing ring and the cavity formed by the engine, ensuring that the leakage amount ≤ 10 ml. S6.4: When the detection is completed and the airtightness detector indicates qualified, the tooling automatically releases; when the detection is completed and if the leakage amount exceeds the tolerance, the airtightness detector indicates unqualified and marks the defective locations.

[0012] By adopting the above technical solutions, it can timely detect the airtightness problems on the oil seal side, ensure that the water pump is not prone to leakage during actual operation, guarantee the working performance and reliability of the water pump, and effectively control the product quality through strict leakage amount detection standards.

[0013] Optionally, step S7 includes the following steps: S7.1: Rotate the pump shaft one full turn in both the forward and reverse directions. It is required that the rotation is smooth without jamming. S7.2: Place the lower housing with the end of the shaft pin facing down, align the engine-side positioning pin with the tooling positioning hole and place it flat. S7.3: Place the water seal with the small end facing up on the punch. Keep the gap between the edge of the water seal and the punch uniform without obvious tilting. S7.4: Start stamping. After stamping is completed, take out the workpiece and check the fit between the water seal and the lower housing. The edge position of the water seal should closely adhere to the installation end face of the lower housing. Pay attention not to rotate the bearing to prevent scratching, and the lower housing should not crack.

[0014] By adopting the above technical solutions, the sealing performance of the water pump can be further enhanced, preventing water from leaking through the gap between the pump shaft and the lower housing, and at the same time avoiding water from entering key parts such as bearings, causing poor lubrication or damage. By controlling the installation height and tightness of the water seal, the uniformity and stability of the sealing effect are ensured.

[0015] Optionally, step S8 includes the following steps: S8.1: Place the lower housing in the tooling positioning hole; S8.2: Apply a uniform circle of glue on the inner wall of the impeller hole, taking care that the glue does not drip; S8.3: Place the impeller with the convex surface facing up on the tooling punch, taking care to keep it close to the punch plane. Discarded products are placed in the defective product box; S8.4: Start stamping. After stamping is completed, wait for the punch to fully reset, then remove the workpiece and inspect it; S8.5: Check the clearance between the impeller and the lower housing of 1±0.2mm using a plug gauge of 0.6mm through / 1.4mm not go. Do not rotate the bearing to prevent scratching. Check two places on the lower housing near the flow channel outlet.

[0016] By adopting the above technical solutions, the impeller can be accurately installed on the pump shaft, and an appropriate clearance between the impeller and the lower housing can be ensured, ensuring the flow rate and head performance of the water pump. At the same time, it avoids friction or collision between the impeller and the lower housing, affecting the operation efficiency and service life of the water pump. Through precise clearance control, the hydraulic performance of the water pump is optimized.

[0017] Optionally, step S10 includes the following steps: S10.1: Install the water pump on the clamping mechanism and press the detection button; S10.2: The clamping mechanism clamps the workpiece, and the airtightness detector starts to detect the airtightness between the water seal and the lower housing; S10.3: When the detection is completed, when the leakage rate ≤ 2ml / min, the airtightness detector prompts qualified, and after marking the qualified mark point, release the clamping; S10.4: When the detection is completed, when the leakage rate is out of tolerance, the airtightness detector prompts unqualified.

[0018] By adopting the above technical solutions, the airtightness of the water seal can be strictly detected, ensuring that there is no leakage at the water seal part during the operation of the water pump, guaranteeing the normal operation and service life of the water pump. By setting clear leakage rate standards, the product quality is effectively controlled.

[0019] Optionally, step S11 includes the following: S11.1: Install the water pump on the clamping mechanism and press the detection button; S11.2: The clamping mechanism clamps the workpiece, and the airtight detector starts to detect the airtightness between the special-shaped sealing ring of the cover and the lower housing and the water pump cover respectively; S11.3: When the detection is completed, the airtight detector prompts qualified, makes a qualified marking point and then releases; S11.4: Check that there is no omission in marking the qualified products. When the detection is completed and the leakage exceeds the tolerance, the airtight detector prompts unqualified.

[0020] By adopting the above technical solutions, it is possible to comprehensively detect the airtightness of the entire water pump, ensure that all sealing parts meet the design requirements, prevent the leakage of media and the entry of external impurities, ensure the stable operation and high-performance performance of the water pump under various working conditions, and ensure the consistency and reliability of product quality through comprehensive detection.

[0021] In a second aspect, the present application provides an assembly device for a water pump, adopting the following technical solutions. The assembly device includes a clamping mechanism arranged on the airtight detector and used for clamping the water pump. The clamping mechanism includes a detection table arranged on the airtight detector, a clamping table arranged on the detection table, a positioning table arranged on the clamping table and used for positioning one end of the water pump close to the shaft pin, and a plurality of pressing components arranged on the clamping table and used for pressing the water pump.

[0022] By adopting the above technical solutions, the end of the water pump with the shaft pin is placed downward on the positioning table to achieve the preliminary positioning of the water pump. Then, the side of the water pump away from the positioning table is pressed by a plurality of pressing components to fix the water pump.

[0023] Optionally, the pressing component includes a cylinder arranged on the clamping table, a lower pressing block hinged to the piston rod of the cylinder, a hinge piece hinged between the lower pressing block and the cylinder housing, and a pressing block arranged on the lower pressing block and used for pressing the water pump.

[0024] By adopting the above technical solutions, when the piston rod of the cylinder extends, the end of the lower pressing block away from the cylinder will press down, driving the pressing block to press down, so as to press different positions of the water pump through the pressing blocks of a plurality of pressing components, and make the water pump stably positioned on the positioning table.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. It can enhance the structural stability of the shaft assembly, prevent the shaft body from displacing or loosening during operation, ensure the transmission accuracy and reliability of the pump shaft, and at the same time ensure its firmness under high-load working conditions by controlling the pull-off force and symmetry of the shaft pin; 2. It can strictly detect the airtightness of the water seal, ensure that there is no leakage at the water seal part during the operation of the water pump, guarantee the normal operation and service life of the water pump, and effectively control the product quality by setting clear leakage amount standards; 3. It can comprehensively detect the airtightness of the whole water pump, ensure that all sealing parts meet the design requirements, prevent medium leakage and entry of external impurities, guarantee the stable operation and high-performance performance of the water pump under various working conditions, and ensure the consistency and reliability of product quality through comprehensive detection. Description of the Drawings

[0026] Figure 1 It is a schematic assembly structure diagram of the first step of the assembly method of the water pump; Figure 2 It is a schematic assembly structure diagram of the second step of the assembly method of the water pump; Figure 3 It is a schematic assembly structure diagram of the third step of the assembly method of the water pump; Figure 4 It is a schematic assembly structure diagram of the fourth step of the assembly method of the water pump; Figure 5 It is a schematic assembly structure diagram of the fifth step of the assembly method of the water pump; Figure 6 It is a schematic assembly structure diagram of the seventh step of the assembly method of the water pump; Figure 7 It is a schematic assembly structure diagram of the eighth step of the assembly method of the water pump; Figure 8 It is a schematic assembly structure diagram of the ninth step of the assembly method of the water pump; Figure 9 It is a schematic structure diagram of the clamping mechanism of the water pump assembly device; Figure 10 It is a schematic structure diagram of the pressing component of the water pump assembly device.

[0027] Description of the reference numerals: 1. Bearing; 2. Pump shaft; 3. Axle pin; 4. Lower housing; 41. Second cavity; 5. Engine side locating pin; 6. Oil seal; 7. Outer sealing ring; 8. Water seal; 9. Impeller; 10. Special-shaped sealing ring; 11. Thermostat; 12. Water pump cover; 121. First cavity; 13. Airtight detector; 14. Clamping mechanism; 141. Detection table; 142. Clamping table; 143. Positioning table; 144. Pressing component; 1441. Cylinder; 1442. Lower pressing block; 1443. Hinge piece; 1444. Pressing block. Detailed Description of the Embodiment

[0028] The following will further describe the present application in detail Figures 1-10 with reference to the attached drawings.

[0029] The embodiment of the present application discloses an assembly method of a water pump. Referring to Figure 1 , the assembly method of the water pump includes the following steps: S1: Check that the identification of bearing 1, 6001 P6, is correct. Place bearing 1 with the identification side facing down into the tooling positioning hole. Check that it is placed horizontally. With the thick end of pump shaft 2 facing up, install it into the fixture punch positioning hole. Press the start button and use the servo press to start stamping. During the stamping process, pay attention for any abnormal noises. After stamping is completed, remove the workpiece and test the rotation of bearing 1, requiring smooth rotation without jamming. Mark defective products with a red pen at the defective area and place them in the yellow box.

[0030] The implementation in this step ensures the tight fit between pump shaft 2 and bearing 1, provides a stable foundation for the subsequent installation and operation of the shaft assembly, guarantees the rotational accuracy and load-bearing capacity of the water pump, and avoids problems such as wobbling and abnormal noises during operation.

[0031] It should be noted that in this step, the model of the servo press is T7832, its pressing force is 200 - 700 kg, the pressing position is 103.4 ± 0.05 mm, and the pressing depth of bearing 1 is 22.8 ± 0.1 mm.

[0032] S2: Install the shaft pin 3 onto pump shaft 2 and perform press fitting to ensure that shaft pin 3 is not damaged or deformed.

[0033] Refer to Figure 2 , specifically, S2 includes the following steps: S2.1: Test the press fitting effect of bearing 1, with smooth rotation without jamming. Press the fixture locking rocker. Insert the end of pump shaft 2 with the pin hole into the fixture until the bottom. Release the locking rocker and gently rotate pump shaft 2. After the locking rocker positioning pin inserts into the pin hole of pump shaft 2, it automatically locks, and at this time, pump shaft 2 cannot rotate. S2.2: Vertically place shaft pin 3 into the fixture positioning hole and ensure it is installed in place without skewing. S2.3: Use the servo press to start stamping. During the stamping process, pay attention for any abnormal noises. After stamping is completed, remove the workpiece and check. Mark defective products with a red pen at the defective area and place them in the yellow box. Check that the shaft hole is not damaged and there are no inclusions, and that shaft pin 3 is not damaged or deformed. S2.4: Use a gauge to check the length by which shaft pin 3 protrudes from both sides of pump shaft 2. Mark qualified products at both ends of shaft pin 3, and the marks should connect shaft pin 3 and pump shaft 2.

[0034] The implementation of this step can enhance the structural stability of the shaft assembly, prevent displacement or loosening of the shaft body during operation, ensure the transmission accuracy and reliability of pump shaft 2, and at the same time, by controlling the pull-off force and symmetry of shaft pin 3, guarantee its firmness under high-load conditions.

[0035] It should be noted that in step S2, the model of the servo press is T7832, its pressing force is 120 - 600 kg, the pressing position is 87.9.4 ± 0.05 mm, and the pulling force of the shaft pin 3 ≥ 100 N, and the symmetry of the bearing 1 pin < 0.5.

[0036] S3: Refer to Figure 3 , check that the qualified product marks are not missed or mislabeled, place the lower housing 4 on the tooling positioning posts, with one end of the pump shaft 2 with the shaft pin 3 facing up, and place it on the lower housing 4. Note that the shaft body needs to be vertical and cannot be placed crooked. Press the start button, and use the servo press to start stamping. Pay attention to any abnormal noises during the stamping process. After stamping is completed, check the workpiece. It is required that after the bearing 1 is pressed in, it is flush with the lower housing 4 and does not protrude from the plane, without deformation or damage. Mark the defective products with a red pen at the defective parts and put them into the yellow box. Test the pressing effect. Rotate the pump shaft 2 one full turn in each direction. It is required that the rotation is smooth and there is no jamming.

[0037] The implementation of this step can accurately install the pump shaft 2 into the lower housing 4, make the bearing 1 flush with the lower housing 4, ensure the overall assembly accuracy and appearance quality of the lower housing 4, and at the same time ensure the smooth rotation of the pump shaft 2, providing an accurate positioning reference for the installation of subsequent components.

[0038] It should be noted that in step S3, the model of the servo press is T7832, its pressing force is 120 - 700 kg, and the pressing position is 47.3 ± 0.3 mm.

[0039] S4: Refer to Figure 4 , place the lower housing 4 flatly aligned with the tooling positioning posts, place the engine-side positioning pin 5 in the punch positioning hole, press the start button, and use the servo press to start stamping. Pay attention to any abnormal noises during the stamping process. After stamping is completed, check the workpiece. It is required that the engine-side positioning pin 5 is perpendicular to the lower housing 4, without deformation or damage. Mark the defective products with a red pen at the defective parts and put them into the yellow box.

[0040] The implementation of this step realizes the precise positioning connection between the lower housing 4 and the engine-side positioning pin 5, provides guarantee for the precise positioning of the subsequent lower housing 4, and at the same time ensures the pulling force of the engine-side positioning pin 5, enhancing the reliability of the connection.

[0041] It should be noted that in step S4, the model of the servo press is T7832, its pressing force is 100 - 1000 kg, and the pressing position is 33.2 ± 0.05 mm.

[0042] S5: Install the oil seal 6 and the outer sealing ring 7 on the lower housing 4 and perform pressing, ensuring that the oil seal 6 is ± 0.5 mm from the end face of the lower housing 4, without damage or deformation.

[0043] Refer to Figure 5, specifically, S5 includes the following steps: S5.1: Install the oil seal 6 onto the oiling tooling, with the opening facing inward, and push it to the end to fit against the fixture for positioning; S5.2: Hold the oil seal 6 and press the oil extrusion switch. After the oil seal 6 rotates one full circle, slowly remove it and check that the entire inner cavity of the oil seal 6 is evenly oiled, without accumulation or local oil shortage; S5.3: Install the oil seal 6 onto the guide sleeve with the opening facing downward, and roll it on the printing table for two circles to apply engine oil, ensuring that the outer ring of the oil seal 6 is evenly coated with engine oil; S5.4: Slip the guide sleeve onto the end of the pump shaft 2, and use the rubber sleeve to push the oil seal 6 to the end. After completion, remove the guide sleeve and place it in the fixed position; S5.5: Place the lower housing 4 at the tooling positioning location, press the start button, and use the servo press to start stamping. After stamping is completed, remove the workpiece for inspection. Mark defective products with a red pen at the defective locations and place them in the yellow box; S5.6: Test the press-fitting effect. Rotate the pump shaft 2 one full circle in both the forward and reverse directions, requiring smooth rotation without jamming, and install the outer sealing ring 7 into the lower housing 4.

[0044] It should be noted that the oil seal 6 is ±0.5 mm from the end face of the lower housing 4, the lip of the oil seal 6 fits tightly with the pump shaft 2 without abnormalities such as depressions or deformations, the outer sealing ring 7 is installed flatly, and the lower housing 4 does not become loose or fall off when inverted. In addition, avoid touching the oiled surface of the oil seal 6 to prevent uneven grease. The guide sleeve of the oil seal 6 should be placed back in the fixed position after each use, and products that have fallen should be placed in the defective product box.

[0045] In step S5, the model of the servo press is T7832, its pressing force is 110 - 130 kg, the pressing position is 64 ±0.5 mm, and the weight of the lubricating oil is 0.02 - 0.05 g.

[0046] The implementation of this step effectively prevents the leakage of the internal medium of the water pump, while preventing external impurities and moisture from entering the water pump, protecting the internal components from contamination and damage, extending the service life of the water pump, and ensuring the stability and reliability of the sealing effect by precisely controlling the installation position and oil injection amount of the oil seal 6.

[0047] S6: Use the airtightness detector 13 to detect the airtightness between the cavity formed by the oil seal 6, the outer sealing ring 7, and the engine, ensuring that the leakage amount ≤ 10 ml.

[0048] Specifically, S6 includes the following steps: S6.1: Rotate the pump shaft 2 one full circle in both the forward and reverse directions, requiring smooth rotation without jamming, flip the lower housing 4, and check that the oil seal 6 is not installed backwards; S6.2: Place the lower cover body with the shaft pin 3 facing downward into the tooling positioning hole; S6.3: Press the start button, the tooling clamps the workpiece, and starts the detection through the airtight detector 13 to detect the airtightness between the cavity formed by the oil seal 6, the outer sealing ring 7 and the engine, ensuring that the leakage amount ≤ 10 ml; S6.4: When the detection is completed, if the airtight detector 13 indicates qualified, the tooling automatically releases; when the detection is completed, if the leakage amount is out of tolerance, the airtight detector 13 indicates unqualified, marks the defective part and puts it into the yellow box.

[0049] It should be noted that in step S6, the model of the airtight detector 13 is AF1813, the test pressure range is 48.5 - 51.5 kpa, the inflation time is 3 s, the stabilization time is 70 s, and the test time is 5 s.

[0050] The implementation of this step can timely detect the airtightness problems on the oil seal 6 side, ensure that the water pump is not prone to leakage during actual operation, guarantee the working performance and reliability of the water pump, and effectively control the product quality through strict leakage amount detection standards.

[0051] S7: Install the water seal 8 onto the lower housing 4 and press it to ensure that the edge position of the water seal 8 is closely attached to the installation end face of the lower housing 4, without gaps and deformations.

[0052] Refer to Figure 6 , specifically, S7 includes the following steps: S7.1: Rotate the pump shaft 2 forward and backward one full turn each, requiring smooth rotation without jamming; S7.2: With the end of the lower housing 4 with the shaft pin 3 facing downwards, align the engine side locating pin 5 with the tooling locating hole and place it flat; S7.3: Place the water seal 8 with the small end facing upwards onto the punch, keeping the gap between the edge of the water seal 8 and the punch uniform and without obvious tilting; S7.4: Use the servo press to start stamping. After stamping is completed, take out the workpiece and check the fit between the water seal 8 and the lower housing 4, mark the defective part with a red pen and put it into the yellow box. The edge position of the water seal 8 should be closely attached to the installation end face of the lower housing 4. Note that the bearing 1 cannot be rotated to prevent scratching, and the lower housing 4 should not crack, and a blue inspection mark should be made.

[0053] It should be noted that in step S7, the model of the servo press is T7832, its pressing force is 400 - 500 kg, the pressing position is 115 ± 0.5 mm, the height of the water seal 8 is 7.1 ± 0.5 mm, and four points are checked by the cross method.

[0054] The implementation of this step can further enhance the sealing performance of the water pump, prevent water from leaking through the gap between the pump shaft 2 and the lower housing 4, and at the same time avoid water from entering key parts such as the bearing 1, causing poor lubrication or damage. By controlling the installation height and tightness of the water seal 8, the uniformity and stability of the sealing effect are ensured.

[0055] S8: Install the impeller 9 on the lower housing 4 and perform press-fitting to ensure a gap of 1 ± 0.4 mm between the impeller 9 and the lower housing 4, without damage or deformation.

[0056] Refer to Figure 7 , specifically, S8 includes the following steps: S8.1: Check that there are no missing marking signs in the previous process, and place the lower housing 4 in the tooling positioning hole; S8.2: Apply a uniform circle of D271 glue on the inner wall of the hole of the impeller 9, and pay attention that the glue does not drip; S8.3: Place the impeller 9 with the convex surface facing up on the tooling punch, and pay attention to keep it close to the punch plane. Drop products should be put into the defective product box; S8.4: Start stamping using the servo press. After stamping is completed, wait for the punch to fully reset, then take out the workpiece and check it; S8.5: Keep a gap of 1 ± 0.4 mm between the impeller 9 and the lower housing 4, and use a plug gauge of 0.6 mm through / 1.4 mm not go to conduct a full inspection. Do not rotate the bearing 1 to prevent scratching. Check two places on the lower housing 4 near the flow channel outlet, and mark blue inspection points on the impeller 9. Defective products should be marked with a red pen at the defective place and put into the yellow box. During sampling inspection, six blades of the impeller 9 need to be sampled for monitoring to ensure a gap of 1 ± 0.4 mm.

[0057] It should be noted that in step S7, the model of the servo press is T7832, its press-fitting pressure is 300 - 1500 kg, and the press-fitting position is 96.5 ± 0.05 mm.

[0058] The implementation of this step can accurately install the impeller 9 on the pump shaft 2, ensure an appropriate gap between the impeller 9 and the lower housing 4, guarantee the flow rate and head performance of the water pump, and at the same time avoid friction or collision between the impeller 9 and the lower housing 4, which may affect the operation efficiency and service life of the water pump. By precise gap control, the hydraulic performance of the water pump is optimized.

[0059] S9: Refer to Figure 8, Check that the impeller 9 is not missing, has a qualified inspection mark, install the lower housing 4 onto the tooling positioning posts, then install the special-shaped sealing ring 10, note that it needs to be fully snapped into the groove of the lower housing 4, then install the thermostat 11 and the two positioning pins, manually rotate it after putting it into the hole to ensure correct placement, check that there is no omission of the qualified mark on the lower housing 4, then install the water pump cover 12, use an electric screwdriver to tighten the screws, take out the product and check according to the requirements of the inspection items, mark the defective products with a red pen at the defective part and put them into the yellow box.

[0060] It should be noted that the screws should be free of burrs and slipping, there should be no wobbling in the fit between the lower housing 4 and the water pump cover 12, the gaps should be uniform, the special-shaped sealing ring 10 should be ensured to be fully snapped into the groove of the lower housing 4, without abnormalities such as distortion, material shortage, foreign objects, looseness, and large gaps, the appearance around the special-shaped sealing ring 10 should be ensured to be free of bumps and scratches, without foreign objects adhering, the appearance of the installation surface should be free of cracks, breakage, and burrs, and the installation surface should be free of bumps from being bumped.

[0061] The implementation of this step can improve the overall sealing structure of the water pump, prevent the medium from leaking from the connection between the lower housing 4 and the water pump cover 12, and at the same time, by installing the thermostat 11 and the positioning pins, ensure the stable operation of the water pump under different working conditions, enhance the heat dissipation performance and positioning accuracy of the water pump, and ensure the reliability of the assembly quality by controlling the tightening torque of the screws and the mating state of the components.

[0062] S10: Use the airtightness detector 13 to detect the airtightness between the water seal 8 and the lower housing 4 to ensure that the leakage rate ≤ 2 ml / min.

[0063] Refer to Figure 9 and Figure 10 , specifically, S10 includes the following steps: S10.1: Install the water pump on the clamping mechanism 14 and press the detection button; S10.2: The clamping mechanism 14 clamps the workpiece, and the airtightness detector 13 starts to detect the airtightness between the water seal 8 and the lower housing 4; S10.3: When the detection is completed and the leakage rate ≤ 2 ml / min, the airtightness detector 13 prompts qualified, make a qualified mark point and then loosen the clamping; S10.4: When the detection is completed and the leakage rate is out of tolerance, the airtightness detector 13 prompts unqualified, mark the defective products with a red pen at the dotting place on the equipment and put them into the yellow box.

[0064] It should be noted that a first cavity 121 is integrally formed at the position of the water pump cover 12 close to the impeller 9. In step S10, before detection, the first cavity 121 is blocked, and the test pressure of the airtightness detector 13 is 145.5 - 154.5 kpa, preferably 150 kpa, to detect the airtightness between the water seal 8 and the lower housing 4. In addition, the inflation time of the airtightness detector 13 is 3 s, the stabilization time is 100 s, and the test time is 5 s.

[0065] In this step, the airtightness of the water seal 8 can be strictly detected to ensure that there is no leakage at the water seal 8 during the operation of the water pump, guarantee the normal operation and service life of the water pump, and effectively control the product quality by setting clear leakage amount standards.

[0066] S11: Use the airtightness detector 13 to detect the airtightness between the special-shaped sealing ring 10 and the lower housing 4 and the water pump cover 12 respectively, and ensure that the leakage amount ≤ 1 ml / min.

[0067] Specifically, S11 includes the following steps: S11.1: Install the water pump on the clamping mechanism 14 and press the detection button; S11.2: The clamping mechanism 14 clamps the workpiece, and the airtightness detector 13 starts to detect to detect the airtightness between the cover special-shaped sealing ring 10 and the lower housing 4 and the water pump cover 12 respectively; S11.3: When the detection is completed, ensure that the leakage amount ≤ 1 ml / min, the airtightness detector 13 prompts qualified, make a qualified marking point and then loosen; S11.4: Check that there is no omission in the marking of the qualified products. When the detection is completed and the leakage amount exceeds the standard, the airtightness detector 13 prompts unqualified, and the defective products are marked with a red pen at the lower housing 4 and put into the yellow box.

[0068] It should be noted that the space formed between the water seal 8 and the oil seal 6 is the second cavity 41. In step S11, before detection, the first cavity 121 and the second cavity 41 are blocked simultaneously, and pressure is applied to each of the first cavity 121 and the second cavity 41. The test pressure of the airtightness detector 13 is 145.5 - 154.5 kpa, preferably 150 kpa, to detect the airtightness between the cover special-shaped sealing ring 10 and the lower housing 4 and the water pump cover 12 respectively. If the leakage amount ≤ 1 ml / min, it means that the cover special-shaped sealing ring 10 has poor sealing. In addition, the inflation time of the airtightness detector 13 is 3 s, the stabilization time is 120 s, and the test time is 5 s.

[0069] The implementation of this step can comprehensively detect the airtightness of the entire water pump, ensure that all sealing parts meet the design requirements, prevent medium leakage and entry of external impurities, guarantee the stable operation and high-performance performance of the water pump under various working conditions, and ensure the consistency and reliability of product quality through comprehensive detection.

[0070] Finally, it should be noted that the water seal 8 prevents water from leaking through the gap between the pump shaft 2 and the lower housing 4, and the impeller 9 is responsible for the hydraulic performance of the water pump. The two work together to ensure that the water pump neither leaks nor can achieve the expected flow rate and head during the liquid transportation process, improving the overall performance and working efficiency of the water pump.

[0071] The embodiment of the present application also discloses an assembly device for a water pump, including a clamping mechanism 14. The clamping mechanism 14 is installed on the airtight detector 13. The clamping mechanism 14 includes a detection table 141, a clamping table 142, a positioning table 143, and multiple groups of pressing components 144. The detection table 141 is installed on the airtight detector 13. The clamping table 142 is horizontally installed on the top of the detection table 141. The positioning table 143 is horizontally installed on the top of the clamping table 142. Multiple groups of pressing components 144 are all installed on the top of the clamping table 142. Multiple groups of pressing components 144 are distributed around the positioning table 143, and the pressing components 144 are used to press the water pump positioned on the positioning table 143. In this embodiment, there are three groups of pressing components 144.

[0072] Place the end of the water pump with the shaft pin 3 facing downwards on the positioning table 143, so that the end of the pump shaft 2 of the water pump, the protruding part of the water pump, and the protruding part of the shaft pin 3 are positioned in the positioning grooves on the positioning table 143, and insert two engine-side positioning pins 5 into the positioning holes on the positioning table 143 to achieve the preliminary positioning of the water pump. Then, press the side of the water pump away from the positioning table 143 through multiple groups of pressing components 144 to fix the water pump, and then detect the airtightness of the water pump through the airtight detector 13.

[0073] Preferably, the pressing component 144 includes a cylinder 1441, a lower pressing block 1442, a hinge piece 1443, and a pressing block 1444. The cylinder 1441 is vertically fixed on the top of the clamping table 142. The lower pressing block 1442 is hinged to the end of the piston rod of the cylinder 1441. The two ends of the hinge piece 1443 are respectively hinged to the lower pressing block 1442 and the outer shell of the cylinder 1441, and the pressing block 1444 is installed at the end of the lower pressing block 1442 close to the positioning table 143 when the lower pressing block 1442 presses down.

[0074] After initially positioning the water pump on the positioning table 143, the piston rod of the air cylinder 1441 extends. Since the pressing block is hinged to the end of the piston rod of the air cylinder 1441, and both ends of the hinge piece 1443 are respectively hinged to the lower pressing block 1442 and the outer shell of the air cylinder 1441, the end of the lower pressing block 1442 far from the air cylinder 1441 will press down, so as to drive the pressing block 1444 to press down. Thus, the pressing blocks 1444 of multiple sets of pressing assemblies 144 press different positions of the water pump, enabling the water pump to be stably positioned on the positioning table 143, which is convenient for subsequent detection of the air tightness of the water pump.

[0075] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for assembling a water pump, characterized in that: The following steps are involved: S1: Install the bearing (1) onto the pump shaft (2) and press fit it, ensuring that the bearing (1) and the pump shaft (2) are perpendicular, the gap is uniform, and there is no deformation or damage; S2: Install the shaft pin (3) into the pin hole of the pump shaft (2) and press fit it to ensure that the shaft pin (3) is not damaged or deformed; S3: Install the pump shaft (2) onto the lower housing (4) and press fit it, making sure that the bearing (1) is flush with the lower housing (4) without deformation or damage; S4: Install the engine side positioning pin (5) onto the lower housing (4) and press fit it, ensuring that the engine side positioning pin (5) is perpendicular to the lower housing (4) and has no deformation or damage; S5: Install the oil seal (6) and the outer sealing ring (7) onto the lower housing (4) and press fit them, ensuring that the oil seal (6) and the end surface of the lower housing (4) are within ±0.5 mm and are not damaged or deformed; S6: Use an airtightness detector (13) to detect the airtightness between the oil seal (6), the outer sealing ring (7) and the cavity formed by the engine to ensure that the leakage is ≤10ml; S7: Install the water seal (8) onto the lower housing (4) and press fit it, ensuring that the edge of the water seal (8) is in close contact with the mounting end surface of the lower housing (4) without any gap or deformation; S8: Install the impeller (9) onto the lower housing (4) and press fit it, ensuring that there is a gap of 1±0.4 mm between the impeller (9) and the lower housing (4), and that there is no damage or deformation; S9: Install the special-shaped sealing ring (10), thermostat (11), positioning pin and water pump cover (12) onto the lower housing (4), and use an electric screwdriver to tighten the screws to ensure that the lower housing (4) and the water pump cover (12) fit together without shaking and with an even gap; S10: Use an airtightness detector (13) to detect the airtightness between the water seal (8) and the lower housing (4) to ensure that the leakage is ≤ 2 ml / min; S11: Use an airtightness detector (13) to detect the airtightness between the special-shaped sealing ring (10) and the lower housing (4) and the water pump cover (12) to ensure that the leakage amount is ≤1 ml / min.

2. A method for assembling a water pump according to claim 1, characterized in that: Step S2 includes the following steps: S2.1: Press the clamp locking lever, insert the end of the pump shaft (2) with the pin hole into the clamp, loosen the locking lever, rotate the pump shaft (2), and the positioning pin of the locking lever is inserted into the pin hole of the pump shaft (2), and then it is automatically locked, and the pump shaft (2) cannot rotate; S2.2: Place the shaft pin (3) vertically into the fixture positioning hole and ensure that it is installed in place without tilting; S2.3: After that, stamping begins. After stamping is completed, the workpiece is taken out and inspected; S2.4: Use a checker to check the length of the shaft pin (3) protruding from the pump shaft (2). For qualified products, mark the shaft pin (3) at both ends to indicate the connection between the shaft pin (3) and the pump shaft (2).

3. A method for assembling a water pump according to claim 1, characterized in that: Step S5 includes the following steps: S5.1: Install the oil seal (6) to the oiling fixture with the opening facing inwards, and push it to the bottom to fit the fixture to limit the position; S5.2: Hold the oil seal (6) and press the oil squeeze switch. After the oil seal (6) rotates one circle, slowly remove it and check that the inner cavity of the oil seal (6) is evenly filled with oil all around, without any accumulation or local lack of oil. S5.3: Install the oil seal (6) on the guide sleeve with the opening facing downwards, and roll it on the stamp pad for two circles to apply the oil, ensuring that the outer ring of the oil seal (6) is evenly coated with oil; S5.4: Insert the guide sleeve into the end of the pump shaft (2), and use the rubber sleeve to push the oil seal (6) to the bottom. After completion, remove the guide sleeve and place it in a fixed position; S5.5: Place the lower housing (4) at the tooling location, press the start button, and start stamping. After stamping is completed, take out the workpiece for inspection, and mark the defective parts of the defective products. S5.6: Test the pressing effect. Rotate the pump shaft (2) one circle forward and one circle backward. The rotation should be smooth without any jamming. Install the outer sealing ring (7) into the lower housing (4).

4. A method for assembling a water pump according to claim 1, characterized in that: Step S6 includes the following steps: S6.1: The pump shaft (2) rotates one circle forward and one circle backward. The rotation should be smooth without any jamming. Turn over the lower housing (4) and check that the oil seal (6) is not installed upside down. S6.2: The lower cover with the shaft pin (3) facing downward is placed in the tooling positioning hole; S6.3: Press the start button, the tooling clamps the workpiece, and starts testing to test the air tightness between the oil seal (6), the outer sealing ring (7) and the cavity formed by the engine to ensure that the leakage is ≤10ml; S6.4: When the test is completed, the airtightness detector (13) indicates that it is qualified, and the tooling is automatically loosened; when the test is completed, if the leakage exceeds the tolerance, the airtightness detector (13) indicates that it is unqualified, and a mark is made on the defective part.

5. The method for assembling a water pump according to claim 1, characterized in that: Step S7 includes the following steps: S7.1: The pump shaft (2) rotates one circle forward and one circle backward. The rotation is required to be smooth without any jamming. S7.2: With one end of the lower housing (4) with the shaft pin (3) facing downward, align the engine side positioning pin (5) with the tooling positioning hole and place it flat; S7.3: The water seal (8) is placed on the punch with the small end facing upwards, and the gap between the edge of the water seal (8) and the punch is even and there is no obvious tilt; S7.4: Start stamping. After stamping is completed, remove the workpiece and check whether the water seal (8) and the lower shell (4) are matched. The edge of the water seal (8) must be close to the installation end surface of the lower shell (4). Be careful not to rotate the bearing (1) to prevent scratches. The lower shell (4) must not be cracked.

6. The method for assembling a water pump according to claim 1, characterized in that: Step S8 includes the following steps: S8.1: Place the lower housing (4) in the tooling positioning hole; S8.2: Apply a circle of glue evenly on the inner wall of the impeller (9) hole, making sure that the glue does not drip; S8.3: Place the impeller (9) with the convex surface facing upwards on the punch, making sure it is close to the punch surface. Any dropped parts should be placed in a defective part box. S8.4: Start stamping. After stamping is completed, wait for the punch to be completely reset, take out the workpiece and inspect it; S8.5: The gap between the impeller (9) and the lower housing (4) is 1±0.2mm. Use a plug gauge with a 0.6mm pass / 1.4mm stop to perform a full inspection. Do not rotate the bearing (1) to prevent scratches. Check the lower housing (4) at two locations near the flow channel outlet.

7. The method for assembling a water pump according to claim 1, characterized in that: Step S10 includes the following steps: S10.1: Install the water pump on the clamping mechanism (14) and press the detection button; S10.2: The clamping mechanism (14) clamps the workpiece, and the airtightness detector (13) starts to detect the airtightness between the water seal (8) and the lower housing (4); S10.3: When the test is completed and the leakage volume is ≤2ml / min, the airtightness detector (13) indicates that it is qualified, and the qualified mark is marked and the clamp is released; S10.4: After the test is completed, if the leakage exceeds the tolerance, the airtightness detector (13) indicates failure.

8. The method for assembling a water pump according to claim 1, characterized in that: Step S11 includes the following: S11.1: Install the water pump on the clamping mechanism (14) and press the detection button; S11.2: The clamping mechanism (14) clamps the workpiece, and the airtightness detector (13) starts to detect the airtightness between the cover body special-shaped sealing ring (10) and the lower housing (4) and the water pump cover (12); S11.3: When the test is completed, the airtightness detector (13) indicates that the test is qualified, and the qualified mark is marked and the device is released; S11.4: Check that all points on qualified products are not missed. When the test is completed and the leakage exceeds the tolerance, the airtightness detector (13) indicates failure.

9. A water pump assembly device, applied to a water pump assembly method according to any one of claims 1 to 8, characterized in that: The invention comprises a clamping mechanism (14) arranged on an airtightness detector (13) and used for clamping a water pump. The clamping mechanism (14) comprises a detection platform (141) arranged on the airtightness detector (13), a clamping platform (142) arranged on the detection platform (141), a positioning platform (143) arranged on the clamping platform (142) and used for positioning one end of the water pump close to the shaft pin (3), and a plurality of groups of pressing components (144) arranged on the clamping platform (142) and used for pressing the water pump.

10. The water pump assembly device according to claim 9, characterized in that: The clamping assembly (144) comprises a cylinder (1441) arranged on a clamping platform (142), a lower pressing block (1442) hinged on a piston rod of the cylinder (1441), a hinged plate (1443) hinged between the lower pressing block (1442) and a housing of the cylinder (1441), and a clamping block (1444) arranged on the lower pressing block (1442) and used for clamping the water pump.

Images