Air tightness testing device for water pump bearing

Abstract

The utility model discloses a water pump bearing air tightness testing device, which comprises a base and a testing box arranged on the base, the testing box is hollow and forms a liquid cavity, the liquid cavity is filled with testing oil, and the testing box is provided with a testing hole. A mounting assembly which is used for mounting an external water pump bearing to be tested in the testing hole and placing the starting end part of a shaft body of the water pump bearing to be tested into the liquid cavity is detachably connected in the testing hole; one side of the test box is provided with a temperature control assembly used for being in linkage cooperation with the test box to control the temperature of the test oil, a pressurization assembly used for being in linkage cooperation with the test box to change the internal pressure of the liquid cavity, and a driving assembly used for driving an external to-be-tested water pump bearing to operate to simulate the actual operation condition of the bearing. The utility model solves the problem that the traditional water pump bearing air tightness testing device is difficult to simulate the actual operation temperature working condition and pressure working condition of the bearing.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump bearing testing arrangement technical field, concretely is a kind of water pump bearing air tightness testing device. BACKGROUND

[0002] In the actual operation process of water pump, the air tightness of bearing is one of the key factors affecting the performance and service life of water pump, if the air tightness of water pump bearing is not good, it can cause problems such as lubricating oil leakage, external impurities intrusion, and further cause bearing wear, noise increase or even water pump failure. At present, the existing water pump bearing air tightness testing device is usually simple in structure, mainly by filling a certain pressure gas into the bearing interior, and observing whether bubble is generated by immersing bearing in liquid to judge air tightness, however, this traditional testing device has obvious limitations: on the one hand, the traditional testing device is difficult to simulate the temperature condition of bearing actual operation, the bearing will generate heat due to friction and other factors during the working process of water pump, resulting in the temperature of the environment where bearing is located increasing, and the change of temperature will affect the sealing structure of bearing and the physical properties of gas, and further change the air tightness of bearing, but the existing device usually tests at normal temperature, and cannot accurately reflect the air tightness condition of bearing under high temperature operation; on the other hand, the traditional device also cannot effectively simulate the pressure condition of bearing actual operation, the bearing interior can bear different pressure during the working of water pump, and the change of these pressure will affect the stress state of bearing sealing structure, thereby affecting air tightness, however, the pressurizing mode of existing testing device is single, cannot dynamically adjust pressure according to actual operation condition, and is difficult to realize linkage control with temperature condition. SUMMARY

[0003] In view of the deficiencies in the prior art, the utility model provides a kind of water pump bearing air tightness testing device, to solve the problems that traditional water pump bearing air tightness testing device is difficult to simulate the temperature condition and pressure condition of bearing actual operation.

[0004] To achieve the above purpose, the utility model provides a kind of water pump bearing air tightness testing device, including base and the test box being set on base, the test box is hollow and is formed with liquid cavity and is filled with test oil in liquid cavity, test hole is opened in the test box, the installation assembly for installing the external water pump bearing to be tested in test hole and making the shaft body of water pump bearing to be tested to be placed into liquid cavity is detachably connected in test hole, the temperature control assembly for being linked with test box to control test oil temperature is arranged on one side of test box, the pressurizing assembly for being linked with test box to change the pressure inside liquid cavity and the driving assembly for driving external water pump bearing to be tested to run to simulate the actual operation condition of bearing

[0005] The technical scheme has the beneficial effects that: in the above technology, the liquid cavity in the test box is filled with test oil, and a temperature control assembly, a pressurizing assembly and a driving assembly are matched to form a multi-working condition simulation system, compared with the traditional device which can only test under static, normal temperature and normal pressure, the structure can simulate the temperature change, pressure fluctuation and running state of the water pump bearing in actual operation, the temperature control assembly controls the temperature of the test oil to simulate the heating environment of the bearing operation, the pressurizing assembly changes the pressure of the liquid cavity to restore the actual pressure working condition, and the driving assembly drives the bearing to run to detect the dynamic sealing performance, the linkage of the three makes the test closer to the real use scene, accurately finds the air tightness defects, and avoids the one-sidedness of the traditional test.

[0006] The utility model further sets up: the liquid cavity bottom is provided with coil pipe, the coil pipe inside circulation has heat conducting oil, the temperature control assembly includes oil type mould temperature controller for communicating with coil pipe to heat the heat conducting oil and circulate delivery to coil pipe in.

[0007] The technical scheme has the beneficial effects that: in the above technology, the liquid cavity in the test box is filled with test oil, and a temperature control assembly, a pressurizing assembly and a driving assembly are matched to form a multi-working condition simulation system, compared with the traditional device which can only test under static, normal temperature and normal pressure, the structure can simulate the temperature change, pressure fluctuation and running state of the water pump bearing in actual operation, the temperature control assembly controls the temperature of the test oil to simulate the heating environment of the bearing operation, the pressurizing assembly changes the pressure of the liquid cavity to restore the actual pressure working condition, and the driving assembly drives the bearing to run to detect the dynamic sealing performance, the linkage of the three makes the test closer to the real use scene, accurately finds the air tightness defects, and avoids the one-sidedness of the traditional test.

[0008] The utility model further sets up: the driving assembly includes the drive motor and the synchronous disc that are used for with the shaft body end of the water pump bearing to be tested detachable connection of setting on the base, drive motor output and synchronous disc transmission connection have many wedge bands between.

[0009] The beneficial effects of the above technical scheme are: in the above technology, the bearing operation simulation system is constructed through the combination of the driving motor, the synchronous disc and the multi-wedge belt, the driving motor provides power, the power is transmitted to the synchronous disc through the multi-wedge belt, and the bearing to be tested is rotated to simulate the rotating working condition in actual operation, the traditional device lacks operation simulation and cannot detect the air tightness of the sealing structure under dynamic load, and the design can find the problems ignored in static test, such as the offset of the sealing lip during rotation and the leakage caused by the change of the lubricating oil film, the multi-wedge belt transmission is stable and has large friction, can efficiently transmit power, ensures the stability of the bearing rotating speed, the synchronous disc and the end of the bearing shaft body are detachably connected, adapt to bearings of different sizes, improve the flexibility of the device, the base fixes the driving motor, guarantees the stability of the system during operation, makes the test process more reliable, provides an effective means for evaluating the sealing performance of the bearing under dynamic working condition, and comprehensively improves the accuracy and practicality of the air tightness test.

[0010] The utility model further provides: the driving motor is variable frequency three phase asynchronous motor, be provided with frequency converter and time relay on the variable frequency three phase asynchronous motor, the variable frequency three phase asynchronous motor passes through frequency converter control synchronous disc rotating speed, time relay and frequency converter linkage cooperation to control the duration of motor operation under different rotating speed.

[0011] The beneficial effects of the above technical scheme are: in the above technology, the variable frequency three phase asynchronous motor is used, the frequency converter and the time relay are matched, the rotating speed is accurately controlled and the running time is automatically controlled, the frequency converter can flexibly adjust the output frequency of the motor, and then control the rotating speed of the synchronous disc, simulate the rotating speed change of the water pump bearing under different working conditions, such as low load idling speed, high load high speed and the like, and the time relay and the frequency converter are linked, the running time under each rotating speed can be set, the multi-rotating speed cycle test can be automatically completed without manual intervention, the rotating speed of the traditional device is fixed, the actual complex and changeable operating state cannot be simulated, the design can comprehensively detect the air tightness of the bearing under different rotating speeds through dynamic rotating speed adjustment, not only improves the test efficiency, but also more truly restores the actual working state of the bearing, provides detailed data for the sealing reliability of the product under multi-rotating speed working condition, ensures that the water pump bearing has good air tightness under various operating conditions, and enhances the adaptability and stability of the product.

[0012] The utility model further provides: the pressurizing component includes positive pressure system and negative pressure system, be connected with two position three way electromagnetic valve between positive pressure system and negative pressure system to realize positive and negative pressure switching through two position three way electromagnetic valve, two position three way electromagnetic valve and test box intercommunication have pressure control pipeline to change liquid cavity inside pressure, two position three way electromagnetic valve and time relay linkage cooperation to realize positive and negative pressure switching when rotating speed switches.

[0013] The beneficial effects of the above technical scheme are that: in the above technology, a dynamic pressure simulation system is constructed through the positive pressure system, the negative pressure system and the two-position three-way electromagnetic valve, and is linked with the time relay to realize synchronous switching of pressure when the rotating speed is switched, the pressure of the traditional device is single, and the pressure mutation or positive and negative pressure alternation in actual operation cannot be simulated, but the design can switch the positive and negative pressure in real time during the operation of the bearing according to the setting, for example, the pressure fluctuation caused by the start and stop of the water pump and the change of the load, for example, the negative pressure environment can detect the ability of the bearing seal to prevent the invasion of external gas, and the positive pressure can detect the internal medium leakage, the two-position three-way electromagnetic valve is sensitive in switching, the pressure control pipeline ensures the stable regulation of the liquid cavity pressure, and the linkage with the time relay makes the pressure change and the rotating speed adjustment synchronous, which is more close to the real working condition, comprehensively detects the adaptability of the bearing sealing structure under the dynamic pressure change, avoids the test blind area caused by insufficient pressure working condition simulation, provides reliable protection for the sealing performance of the water pump bearing in the complex pressure environment, and improves the stability and durability of the product in actual use; in the above technology, the positive pressure system and the negative pressure system can adopt a pump type pressurizing device such as a pressure pump, and therefore the structure and function thereof will not be described in detail.

[0014] The utility model further sets up: the installation component includes installation cover, the installation cover axle hole is the installation hole for the outside world bearing to be tested installation, the installation cover outer wall is provided with the sealing plate for being attached on the test box outer wall, be provided with the sealing washer between the sealing plate and the test box outer wall, a plurality of installation bolts are detachably connected between the sealing plate and the test box.

[0015] The beneficial effects of the above technical scheme are that: in the above technology, a dynamic pressure simulation system is constructed through the positive pressure system, the negative pressure system and the two-position three-way electromagnetic valve, and is linked with the time relay to realize synchronous switching of pressure when the rotating speed is switched, the pressure of the traditional device is single, and the pressure mutation or positive and negative pressure alternation in actual operation cannot be simulated, but the design can switch the positive and negative pressure in real time during the operation of the bearing according to the setting, for example, the pressure fluctuation caused by the start and stop of the water pump and the change of the load, for example, the negative pressure environment can detect the ability of the bearing seal to prevent the invasion of external gas, and the positive pressure can detect the internal medium leakage, the two-position three-way electromagnetic valve is sensitive in switching, the pressure control pipeline ensures the stable regulation of the liquid cavity pressure, and the linkage with the time relay makes the pressure change and the rotating speed adjustment synchronous, which is more close to the real working condition, comprehensively detects the adaptability of the bearing sealing structure under the dynamic pressure change, avoids the test blind area caused by insufficient pressure working condition simulation, provides reliable protection for the sealing performance of the water pump bearing in the complex pressure environment, and improves the stability and durability of the product in actual use; in the above technology, the positive pressure system and the negative pressure system can adopt a pump type pressurizing device such as a pressure pump, and therefore the structure and function thereof will not be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional view of the utility model;

[0017] Figure 2 It is a partial perspective view of Figure 1

[0018] Figure 3 It is a three-dimensional view of the liquid tank in the utility model;

[0019] Figure 4 It is a partial sectional view of the liquid tank in the utility model. DETAILED DESCRIPTION

[0020] ​The utility model provides a kind of water pump bearing air tightness testing device, including base 1 and be set on the test box 2 of base 1, the test box 2 is hollow and is formed with liquid cavity 21 and liquid cavity 21 is filled with test oil, test hole 22 is opened on the test box 2, test hole 22 is detachably connected with the installation assembly for installing the external water pump bearing to be tested in test hole 22 and makes the shaft body initial end end of water pump bearing to be tested to be placed into liquid cavity 21, the test box 2 side is provided with the temperature control component for being linked with test box 2 to control test oil temperature, the pressurizing component for being linked with test box 2 to change the pressure inside liquid cavity 21 and the driving component for driving external water pump bearing to be tested to run to simulate the actual operation condition of bearing, the bottom of liquid cavity 21 is provided with coil pipe 23, heat conducting oil is circulated in the inside of coil pipe 23, the temperature control component includes oil type mold temperature controller 11 for being communicated with coil pipe 23 to heat the heat conducting oil and then circulate and deliver into coil pipe 23, the driving component includes driving motor 3 being set on base 1 and the synchronous disc 31 for being detachably connected with the shaft body end of water pump bearing to be tested, the driving motor 3 output end and synchronous disc 31 are transmissionally connected with multiple belt 32, the driving motor 3 is variable frequency three-phase asynchronous motor, variable frequency three-phase asynchronous motor is provided with frequency converter and time relay, variable frequency three-phase asynchronous motor controls the rotational speed of synchronous disc 31 by frequency converter, the time relay and frequency converter are linked to control the duration of motor operation under different rotational speed, the pressurizing component includes positive pressure system 12 and negative pressure system 13, two-way three-way electromagnetic valve 14 is connected between positive pressure system 12 and negative pressure system 13 to realize positive and negative pressure switching by two-way three-way electromagnetic valve 14, two-way three-way electromagnetic valve 14 is communicated with pressure control pipeline to change the pressure inside liquid cavity 21, two-way three-way electromagnetic valve 14 and time relay are linked to realize positive and negative pressure switching simultaneously when rotational speed switches, the installation assembly includes installation sleeve 4, the shaft hole of installation sleeve 4 is installation hole for installing external water pump bearing to be tested, the outer peripheral wall of installation sleeve 4 is provided with sealing plate 41 for being attached on the outer wall of test box 2, sealing gasket 42 is arranged between sealing plate 41 and the outer wall of test box 2, a plurality of mounting bolts 43 are detachably connected between sealing plate 41 and test box 2.

[0021] The bearing to be tested in the above-mentioned technology is identified as 5 in the drawings of the specification.

[0022] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, and the person skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed for protection, and the protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A device for testing the airtightness of a water pump bearing, characterized in that: The device includes a base and a test chamber mounted on the base. The test chamber is hollow and contains a liquid cavity filled with test oil. A test hole is provided on the test chamber. An installation assembly is detachably connected to the test hole for mounting an external water pump bearing to be tested in the test hole and placing the beginning end of the bearing shaft into the liquid cavity. A temperature control assembly is provided on one side of the test chamber for controlling the temperature of the test oil, a pressurization assembly for changing the internal pressure of the liquid cavity, and a drive assembly for driving the external water pump bearing to be tested to simulate the actual operating conditions of the bearing.

2. The water pump bearing airtightness testing device according to claim 1, characterized in that: A coil is provided at the bottom of the liquid chamber, and heat transfer oil circulates inside the coil. The temperature control component includes an oil-type mold temperature controller that communicates with the coil to heat the heat transfer oil and then circulate it into the coil.

3. The water pump bearing airtightness testing device according to claim 1, characterized in that: The drive assembly includes a drive motor mounted on a base and a timing disc for detachable connection to the shaft end of the bearing of the water pump under test. A multi-ribbed belt is connected between the output end of the drive motor and the timing disc.

4. The water pump bearing airtightness testing device according to claim 3, characterized in that: The drive motor is a variable frequency three-phase asynchronous motor. The variable frequency three-phase asynchronous motor is equipped with a frequency converter and a time relay. The variable frequency three-phase asynchronous motor controls the speed of the synchronous disk through the frequency converter. The time relay works in conjunction with the frequency converter to control the duration of motor operation at different speeds.

5. The water pump bearing airtightness testing device according to claim 4, characterized in that: The pressurization assembly includes a positive pressure system and a negative pressure system. A two-position three-way solenoid valve is connected between the positive pressure system and the negative pressure system to achieve positive and negative pressure switching. The two-position three-way solenoid valve is connected to the test chamber through a pressure control pipeline to change the internal pressure of the liquid chamber. The two-position three-way solenoid valve is linked with a time relay to achieve positive and negative pressure switching synchronously when the speed changes.

6. The water pump bearing airtightness testing device according to claim 1, characterized in that: The mounting assembly includes a mounting sleeve, the mounting sleeve having a shaft hole for mounting an external water pump bearing to be tested, the outer peripheral wall of the mounting sleeve having a sealing plate for attaching to the outer wall of the test chamber, a sealing gasket between the sealing plate and the outer wall of the test chamber, and a number of mounting bolts detachably connecting the sealing plate and the test chamber.

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