CN203643093U - A test device for sealing performance of liquid lubricated mechanical seal - Google Patents

Abstract

A testing apparatus for seal performance of liquid lubrication mechanical seal includes a sealing device, a drive device, an auxiliary device and a testing device. The sealing device includes a sealing chamber having a sealing liquid inlet and a sealing liquid outlet; a moving assembly mounted in the sealing chamber; and a static assembly mounted in the sealing chamber. The drive device includes a support, a motor, a synchronous pulley, a synchronous belt, a rotating shaft and a bearing housing. The testing device includes a drive rod, a pressure transducer, a thermocouple sensor, an electronic balance and a computer. The testing apparatus for seal performance of liquid lubrication mechanical seal can automatically collect all kinds of seal transverse plane friction torques, seal transverse plane temperature rises and seal transverse plane leakage rate accurately and conveniently. The testing apparatus for seal performance of liquid lubrication mechanical seal is low in vibration and noise, and compact in structure. It is convenient to dismounting and assembling. The testing apparatus is convenient to mount, dismount and fold in half. The testing apparatus has a three-fulcrum structure, and overcomes a disadvantage of large vibration of the experiment table support of a traditional two -fulcrum seal experiment apparatus or a weighing cantilever beam seal experiment apparatus in a high speed running condition.

Description

A test device for sealing performance of liquid lubricated mechanical seal

technical field

The utility model relates to a testing device for the sealing performance of a liquid lubricated mechanical seal. the

Background technique

Among the currently known mechanical seal test devices, most of them are two fulcrums or cantilever beam seal test devices. The rotating main shaft and the motor use a coupling to transmit power. If the alignment is not good, the shaft end will swing and The vibration is very large, which will seriously affect the accurate measurement of the performance parameters of the mechanical seal; in addition, the bearing box of the traditional sealing device is an integral structure, which requires casting process, which is time-consuming and labor-intensive. The measurement of traditional mechanical seal friction torque is mostly obtained by installing a torque meter between the motor and the bearing box. The test data includes the friction torque of the bearing in the bearing box and the viscous resistance between the lubricating oil and the shaft. Although this value can be obtained by Part of the test calibration is eliminated, but on the one hand, it increases the workload of the test. More importantly, during the long-term test process, the temperature of the bearing box rises, causing the shaft to expand due to heat, and its value is difficult to estimate quantitatively. Therefore, the existing mechanical seal test system is too much affected by the bearing box, and cannot accurately evaluate the seal friction performance, especially for the non-contact mechanical seal with the pressure flow groove on the end face, the order of magnitude of the friction torque itself is relatively small, if there is the above With so many unknown factors that are difficult to evaluate, its friction performance is difficult to accurately evaluate. the

Contents of the invention

In order to solve the problems of large vibration, difficult centering, and difficulty in accurately measuring the friction torque of the sealing end face when the traditional sealing experiment device is running at high speed, the utility model provides a novel and accurate method for measuring the friction torque, which can conveniently adjust the shaft speed and the sealing chamber It is a liquid lubricated mechanical seal with low body pressure, small vibration, simple centering, installation and disassembly, and automatic collection of sealing performance parameters. the

A liquid lubricated mechanical seal sealing performance device according to the utility model is characterized in that it includes a sealing device, a driving device, an auxiliary device, and a testing device, and the sealing device includes a sealing cavity with a sealing liquid inlet and outlet . A dynamic assembly and a static assembly installed in the sealed cavity, the dynamic assembly includes a dynamic ring seat, an experimental sealing dynamic ring, and an auxiliary sealing dynamic ring, and the experimental sealing dynamic ring and the auxiliary sealing dynamic ring are installed on the shaft of the rotating shaft Put it on; the static assembly includes a static ring end cover, an auxiliary static ring end cover, an experimental sealing static ring and an auxiliary sealing static ring. The experimental static ring and the auxiliary sealing static ring are respectively connected to the two sides of the sealing cavity The static ring end cover and the auxiliary static ring end cover at the end are fixed, and the end surface contact surface of the experimental sealing static ring and the experimental sealing dynamic ring, the auxiliary sealing static ring and the auxiliary sealing dynamic ring The end face contact surfaces are all located inside the sealed cavity; the static ring end cover and the auxiliary static ring end cover are respectively fixed on the first bearing seat and the second bearing seat; the experimental sealing static ring There is a leak port and a temperature measuring hole on the top;

The drive device includes a bracket, a motor, a synchronous pulley, a synchronous belt, a rotating shaft and a bearing housing, the motor is fixed on the bracket, and the output shaft of the motor is connected to the rotating shaft passing through the bearing housing through the synchronous belt pulley and the synchronous belt ; The motor is connected with the computer through the motor frequency converter;

The auxiliary device includes a compressor, a high-pressure pipe, a liquid storage tank and a circulation pump, the compressor is connected to the liquid storage tank through a high-pressure pipe, and the inlet and outlet of the liquid storage tank are connected to the liquid storage tank through a high-pressure pipe and a circulation pump. The inlet and outlet of the sealed cavity are connected;

The test device includes a dowel, a pressure sensor, a thermocouple sensor, an electronic balance and the above-mentioned computer, one end of the dowel is fixed on the sealed cavity, and the other end is connected to the bottom of the sealed cavity. The pressure sensors are in contact with each other; the thermocouple sensor is located at the temperature measuring hole of the static ring of the experiment; the pressure sensor, thermocouple sensor and electronic balance are respectively connected to the computer. the

A sealing structure composed of two sets of dynamic components and static components is installed in the sealed cavity. the

The two ends of the bearing box are installed with a second bearing seat and a third bearing seat, and the rotating shaft passes through the second bearing and is installed on the bearings of the second bearing seat and the third bearing seat. the

The temperature measurement hole on the back of the static ring of the experimental seal is 1mm away from the sealing end face. the

The sealing cavity is connected with the static ring sealing end cover and the auxiliary static ring sealing end cover through bolts to form a detachable structure. the

The first bearing seat, the second bearing seat, and the third bearing seat are fixed on two horizontal slide rails by screws, and the horizontal central axis of the sealed cavity coincides with the central axis of the rotating shaft . the

A control valve is set on the high-pressure pipe. the

Utilize the device described in the utility model to carry out following operations:

1) Add sealing medium to the liquid storage tank, start the compressor to supply pressure to the sealing pressure, start the circulation pump to realize the circulation of the sealing medium in the sealing cavity, and the pressure of the sealing medium is controlled by the compressor;

2) Measure the temperature of the end face: start the motor, the motor drives the moving components to rotate, insert a thermocouple sensor into the test hole on the static seal ring of the experiment, the thermocouple sensor transmits the real-time monitored temperature signal to the computer, and the computer performs the temperature signal received. Analytical processing;

3) Measure the leakage rate: under the action of the pressure difference on the end face of the mechanical seal, the sealing medium will leak to the outside through the end face, and the leaked sealing medium will be collected by the connecting pipe and then introduced into the measuring container, and placed in the precision of one ten-thousandth of a gram Above the electronic analytical balance, the electronic analytical balance is connected to the computer with a data line, and the data is read at a fixed time interval, and the leakage rate can be obtained by weighing the mass of the liquid in the container within a fixed time;

4) Measuring friction torque: the sealing chamber is connected to the dowel rod, and the other end of the dowel rod is in vertical contact with the pressure sensor. During the test, the friction torque on the end face of the mechanical seal will be balanced with the torque generated by the force measured by the pressure sensor to obtain the pressure The distance between the sensor and the shaft can be used to obtain the friction torque (M) of a set of sealing structures, namely:

M=0.5×F×R

Among them, M represents the friction torque; F represents the pressure of the dowel bar on the pressure sensor; R represents the vertical distance between the central axis of the sealed cavity and the force sensor, and 0.5 represents the use of two sets of the same sealing structure during the test. the

Working principle: The motor is fixed on the bracket by bolts, and the motor and the rotating shaft are connected by a synchronous pulley and a synchronous belt. The speed of the motor can be adjusted by computer or manually. There are two sets of the same dynamic and static components in the sealed cavity. On the one hand, this arrangement can automatically balance the axial force in the sealing chamber; on the other hand, the average value of the data measured during the test can be used to measure the sealing performance more accurately; the sealing end surface measured in the experiment Leakage rate, end face temperature, and end face friction torque are all the sealing performance parameters of the seal; before the experiment, first add the sealing medium to the liquid storage tank, then start the compressor to supply pressure to the sealing pressure, and start the circulating pump to realize the sealing medium in the sealing chamber. The internal circulation, the pressure of the sealing medium can be controlled by the compressor; the motor is started during the experiment, and the motor drives the shaft to rotate through the belt and pulley. Under the action of the pressure difference on the end face of the mechanical seal, the sealing medium will leak through the end face to the outside, The leaked liquid is collected through a conduit and then flows into a container placed on an electronic analytical balance. The leak rate of the seal can be obtained by weighing the mass of the liquid in the container within a fixed period of time; Measured in the ring hole; when the moving component rotates, the friction torque between the seal end faces will be balanced with the torque on the outer end of the dowel rod, and the product of the force measured by the pressure sensor and the force arm is the resultant friction of the two mechanical seals Torque (M=F×R); the data measured by the pressure sensor, thermocouple sensor and electronic balance can be collected and processed by the computer to obtain the sealing performance parameters of the tested mechanical seal. the

The beneficial effects of the utility model are: 1) This experimental device can measure the leakage rate, end surface temperature and friction torque of various liquid lubricated mechanical end seals online; 2) The traditional sealing experimental device cannot accurately measure the friction torque, and this experimental device adopts a The new method of measuring the friction torque can obtain the friction torque between the sealing end faces more accurately; 3) The pressure and speed in this experimental device can be adjusted conveniently, and can be used for contact mechanical seals and non-contact mechanical seals under different operating conditions. Experimental research on sealing; 4) This experimental device adopts a three-point structure, which overcomes the shortcomings of the traditional two-point or cantilever beam type sealing experimental device when the test bench vibrates at high speed; 5) The motor of this experimental device follows the shaft through The synchronous pulley is connected with the synchronous belt, which overcomes the problem of difficult centering when the motor and the shaft are connected through a coupling in the traditional sealing device. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

FIG. 2 is a partially enlarged view of FIG. 1 . the

FIG. 3 is a partially enlarged view of FIG. 2 . the

Fig. 4 is a left view of the liquid mechanical seal experimental device. the

Figure 5 is a schematic diagram of the friction torque test (M represents the friction torque; F represents the pressure of the dowel rod on the pressure sensor; R represents the vertical distance between the central axis of the sealed cavity and the force sensor). the

Detailed ways

Further illustrate the utility model below in conjunction with accompanying drawing

Refer to attached picture:

Embodiment 1 A liquid-lubricated mechanical seal sealing performance device described in the utility model includes a sealing device 1, a driving device 2, an auxiliary device 3, and a testing device 4. The sealing device 1 includes a seal liquid inlet and outlet The sealed cavity 11, the moving assembly 12 and the static assembly 13 installed in the sealing cavity, the moving assembly 12 includes the moving ring seat 121, the experimental sealing moving ring 122, the auxiliary sealing moving ring 123, the experimental sealing moving ring The ring 122 and the auxiliary sealing dynamic ring 123 are installed on the shaft sleeve 251 of the rotating shaft 25; the static assembly 13 includes a static ring end cover 131, an auxiliary static ring end cover 132, an experimental sealing static ring 133 and an auxiliary sealing static ring 134, The experimental sealing static ring 133 and the auxiliary sealing static ring 134 are respectively fixed to the static ring end caps 131 and the auxiliary static ring end caps 132 at both ends of the sealing cavity 11, and the experimental sealing static ring 133 is connected to the The contact surface of the end surface of the experimental sealing dynamic ring 122, the contact surface of the auxiliary sealing static ring 134 and the end surface of the auxiliary sealing dynamic ring 123 are all located inside the sealing cavity 11; The ring end cover 131 and the auxiliary static ring end cover 132 are respectively fixed on the first bearing seat 14 and the second bearing seat 261; the experimental sealing static ring 133 is provided with a leakage port 1311 and a temperature measuring hole 1312;

Described driving device 2 comprises support 21, motor 22, synchronous pulley 23, synchronous belt 24, rotating shaft 25 and bearing box 26, and described motor 22 is fixed on the support 21, and the output shaft of described motor 22 passes through synchronous pulley 23 and synchronous belt 24 are connected with the rotating shaft 25 that runs through bearing housing 26; Described motor 22 is connected with computer 43 by motor frequency converter;

The auxiliary device 3 includes a compressor 31, a high-pressure pipe 32, a liquid storage tank 33 and a circulating pump 34, the compressor 31 is connected with the liquid storage tank 33 through a high-pressure pipe 32, and the inlet and outlet of the liquid storage tank 33 Connect with the inlet and outlet of the sealed cavity 11 through the high-pressure pipe 32 and the circulation pump 34;

Described test device 4 comprises dowel bar 41, pressure sensor 42, thermocouple sensor, electronic balance and above-mentioned computer 43, and described dowel bar 41 one end is fixed on the sealed cavity 11, and the other end is positioned at described The pressure sensor 42 below the sealed chamber 11 is in contact; the thermocouple sensor is located at the temperature measuring hole 1232 of the experimental sealed static ring 123; the pressure sensor 42, the thermocouple sensor and the electronic balance are respectively connected to the The computer 43 is connected. the

A sealing structure composed of two sets of moving components 12 and static components 13 is installed in the sealed cavity 11 . the

The two ends of the bearing box 26 are equipped with a second bearing seat 261 and a third bearing seat 262 with bearings, and the rotating shaft 25 is installed through the bearings of the second bearing seat 261 and the third bearing seat 262 . the

The temperature measuring hole 1331 on the back of the experimental sealing static ring 133 is 1 mm away from the sealing end face. the

The sealing cavity 11 is connected with the sealing end cover of the experimental static sealing ring 133 and the sealing end cover of the auxiliary sealing static ring 134 through bolts, forming a detachable structure. the

The first bearing seat 14, the second bearing seat 261, and the third bearing seat 262 are fixed on two horizontal slide rails 27 by screws, and the horizontal central axis of the sealed cavity 11 is connected to the The central axes of the rotating shafts 25 coincide. the

A control valve 321 is provided on the high-pressure pipe 32 . the

Working principle: the motor 22 is fixed on the bracket 21 by bolts, the motor 22 and the rotating shaft 25 are connected by a synchronous pulley 23 and a synchronous belt 24, the speed of the motor 22 can be adjusted by a computer 43 or manually, and the sealed cavity 11 is equipped with two The sealing structure composed of the same moving assembly 12 and static assembly 13, on the one hand, this arrangement can automatically balance the axial force in the sealing chamber, on the other hand, the average value of the data measured during the test can be more accurate The sealing performance was measured; the sealing end face leakage rate, end face temperature, and end face friction torque measured in the experiment are the sealing performance parameters of the seal; before the experiment, first add the sealing medium to the liquid storage tank, and then start the compressor to supply pressure to the sealing pressure , start the circulating pump to realize the circulation of the sealing medium in the sealing chamber, the pressure of the sealing medium can be controlled by the compressor; start the motor during the experiment, the motor drives the shaft to rotate through the belt and pulley, under the action of the pressure difference on the end face of the mechanical seal, The sealing medium will leak to the outside through the end face, and the leaked liquid will flow into the container placed on the electronic analytical balance after being collected through the conduit, and the sealing leakage rate can be obtained by weighing the mass of the liquid in the container within a fixed time; The liter can be measured by inserting the thermocouple sensor into the test static ring hole; when the moving component rotates, the friction torque between the sealing end faces will be balanced with the torque on the outer end of the dowel rod, and the force measured by the pressure sensor and the force arm The product of the two mechanical seals is the combined frictional moment (M=F×R); the data measured by the pressure sensor, thermocouple sensor and electronic balance can be collected and processed by the computer to obtain the sealing performance parameters of the tested mechanical seal. the

Embodiment 2 utilizes the device described in embodiment 1 to carry out the following operations:

1) Add sealing medium to the liquid storage tank, start the compressor to supply pressure to the sealing pressure, start the circulating pump to realize the circulation of the sealing medium in the sealing chamber, and the pressure of the sealing medium is controlled by the compressor;

2) Measure the temperature of the end face: start the motor, the motor drives the moving components to rotate, insert a thermocouple sensor into the test hole on the static seal ring of the experiment, the thermocouple sensor transmits the real-time monitored temperature signal to the computer, and the computer performs the temperature signal received. Analytical processing;

3) Leakage rate measurement: Under the action of the pressure difference on the end face of the mechanical seal, the sealing medium will leak to the outside through the end face, and the leaked sealing medium will be collected by the connecting pipe and then introduced into the measuring container, and placed in a measuring container with an accuracy of one ten thousandth of a gram. Above the electronic analytical balance, the electronic analytical balance is connected to the computer with a data line, and the data is read at a fixed time interval, and the leakage rate can be obtained by weighing the mass of the liquid in the container within a fixed time;

4) Measuring friction torque: the sealing chamber is connected to the dowel rod, and the other end of the dowel rod is in vertical contact with the pressure sensor. During the test, the friction torque on the end face of the mechanical seal will be balanced with the torque generated by the force measured by the pressure sensor to obtain the pressure The distance between the sensor and the shaft can be used to obtain the friction torque (M) of a set of sealing structures, namely:

M=0.5×F×R

Among them, M represents the friction torque; F represents the pressure of the dowel bar on the pressure sensor; R represents the vertical distance between the central axis of the sealed cavity and the force sensor, and 0.5 represents the use of two sets of the same sealing structure during the test. the

The content described in the embodiments of this specification is only an enumeration of the realization forms of the utility model concept. The protection scope of the utility model should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the utility model also includes Those skilled in the art can conceive equivalent technical means according to the utility model concept. the

Claims (6)

1. the proving installation of a liquid lubrication mechanical seal sealing property, it is characterized in that: comprise packoff, drive unit, servicing unit, proving installation, described packoff comprises with the seal chamber of sealing liquid import and export, is arranged on the moving assembly in seal chamber, quiet assembly, described moving assembly comprises rotating seat, experiment moving sealing ring, auxiliary seal rotating ring, and described experiment moving sealing ring, auxiliary seal rotating ring are arranged on the axle sleeve of rotating shaft; Described quiet assembly comprises stationary ring end cap, auxiliary stationary ring end cap, experiment stationary seal ring and auxiliary seal stationary ring, described experiment stationary ring, described auxiliary seal stationary ring are fixed with stationary ring end cap and the auxiliary stationary ring end cap at seal chamber two ends respectively, and the end contact face of the end contact face of described experiment stationary seal ring and described experiment moving sealing ring, described auxiliary seal stationary ring and described auxiliary seal rotating ring is all positioned at described seal chamber inside; Described stationary ring end cap and described auxiliary stationary ring end cap are separately fixed on clutch shaft bearing seat, the second bearing seat; On described experiment stationary seal ring, have and connect leak and thermometer hole;

Described drive unit comprises support, motor, synchronous pulley, Timing Belt, rotating shaft and bearing housing, and described motor is fixed on support, and the output shaft of described motor is connected with the rotating shaft that runs through bearing housing with Timing Belt by synchronous pulley; Described motor is connected with computing machine by motor inverter;

Described servicing unit comprises compressor, high-voltage tube, fluid reservoir and ebullator, and described compressor is connected with fluid reservoir by high-voltage tube, and described fluid reservoir is imported and exported by high-voltage tube and ebullator and is connected with the import and export of described seal chamber;

Described proving installation comprises transmission rod, pressure transducer, thermocouple sensor, electronic balance and above-mentioned computing machine, and described transmission rod one end is fixed on seal chamber, the other end contacts with the pressure transducer that is positioned at described seal chamber below; Described thermocouple sensor is positioned at the thermometer hole place of described experiment stationary ring; Described pressure transducer, thermocouple sensor and electronic balance is connected with described computing machine respectively.

2. proving installation as claimed in claim 1, is characterized in that: the hermetically-sealed construction that the moving assembly of two covers and quiet assembly composition are installed in described seal chamber.

3. proving installation as claimed in claim 2, it is characterized in that: the second bearing seat and the 3rd bearing seat with bearing installed at the two ends of described bearing housing, and described rotating shaft runs through on the bearing that is arranged on the second bearing seat and the 3rd bearing seat by the second described bearing.

4. proving installation as claimed in claim 3, is characterized in that: the thermometer hole at the described experiment stationary seal ring back side is extremely from seal face 1mm.

5. proving installation as claimed in claim 4, is characterized in that: described seal chamber is connected with stationary ring end cover and auxiliary stationary ring end cover by bolt, forms detachable type structure.

6. proving installation as claimed in claim 5, it is characterized in that: described clutch shaft bearing seat and the second described bearing seat, the 3rd described bearing seat are fixed by screws on two articles of horizontal slide rails, and the horizontal middle spindle of seal chamber overlaps with the central shaft of described rotating shaft.

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