CN114646430A

CN114646430A - Test method of double-end-face mechanical seal static pressure operation test bed

Info

Publication number: CN114646430A
Application number: CN202210395620.4A
Authority: CN
Inventors: 邵中魁; 沈小丽; 何朝辉; 盛云庆; 王国军; 柯仙文; 林腾胜
Original assignee: Wenling Institute Of Product Quality Inspection Wenling Institute Of Metrological Verification; Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd
Current assignee: Wenling Institute Of Product Quality Inspection Wenling Institute Of Metrological Verification; Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-06-21

Abstract

The invention relates to a test method of a double-end-face mechanical seal static pressure operation test bed, and belongs to the technical field of detection equipment. The invention comprises a bearing box, a pressure cavity first section, a pressure cavity tail section, a transmission main shaft, a core shaft, a replaceable shaft sleeve, a flange cover, a liquid receiving cavity, a high-pressure cooling tank and the like, wherein the pressure cavity first section is arranged on the bearing box and forms a sealed pressure cavity, the pressure cavity tail section is arranged on the pressure cavity first section and forms a second sealed cavity, one end of the core shaft is matched and positioned with the transmission main shaft through a central taper hole, the other end of the core shaft is supported through a rolling bearing, a set of tested mechanical sealing products and a set of tested mechanical sealing products are simultaneously and oppositely arranged on the core shaft, the sealed pressure cavity and the high-pressure cooling tank are mutually communicated through a pipeline, and the detection tests of the mechanical sealing products with two end surfaces of different sizes can be realized by replacing the replaceable shaft sleeve during working. The invention has the advantages of high running precision of the main shaft, high upper limit of allowable pressure, good circulating temperature control effect, wide range of applicable detection products, convenient operation and maintenance and the like.

Description

Test method of double-end-face mechanical seal static pressure operation test bed

Technical Field

The invention relates to a test bed and a test method, in particular to a test method of a double-end-face mechanical seal static pressure operation test bed, and belongs to the technical field of detection equipment.

Background

The mechanical seal is called end face seal, is a shaft seal device of rotating machinery, mainly comprises a moving ring (rotating ring) and a static ring (static ring), is widely applied to equipment such as centrifugal pumps, centrifuges, reaction kettles, compressors and the like, and has the quality of the mechanical seal as a core part for preventing leakage, which greatly and directly influences the performance and the service life of the equipment. Therefore, the reliability of the mechanical seal is particularly important, and accordingly, the research on the mechanical seal detection technology is also significant.

The mechanical sealing product can be subdivided into a plurality of types such as single-end-face mechanical sealing, double-end-face mechanical sealing and the like according to different structural forms, wherein the double-end-face mechanical sealing is a rotating shaft sealing device widely applied to submersible pump products. The static pressure operation test of the mechanical seal is mainly carried out in the industry aiming at the double-end-face mechanical seal product so as to detect the leakage rate of the mechanical seal product in static and rotating states respectively and judge whether the mechanical seal product is qualified or not according to the leakage rate.

The invention discloses a mechanical seal detection device and a flushing detection process in Chinese patent with publication number CN111238741A, which is published as 06, 05 and 2020. This patent has designed the pump bracket to install the pump case and form the pressure chamber on the bracket, quiet ring is installed on the pump case, the rotating ring is installed on the pump shaft, through the analysis, this patent device exists following several aspects not enough: (1) the pump shaft is only provided with a mechanical seal product to be detected, so that a large axial unbalance force can be generated to damage a detection device, and the detection device is particularly not suitable for detecting high-pressure mechanical seal products (the larger the pressure is, the larger the axial unbalance force is); (2) the end of the pump shaft, which is provided with a mechanical seal product, is suspended without any support, so that large radial circular runout is easily generated when the pump shaft rotates at high speed, the running precision is reduced, and even the reliability of a test result is reduced (the mechanical seal is leaked due to large radial runout of the pump shaft, and the test result is misled); (3) the detection device is lack of a sealing liquid heating or cooling mechanism and cannot actively control the temperature of the sealing liquid; (4) the detection device cannot be suitable for detecting double-end-face mechanical seal products and can only be suitable for detecting conventional single-end-face mechanical seal products, the detection device is poor in universality, parts such as pump shafts and pump shells needing to be correspondingly replaced and adapted to mechanical seal products of different sizes are complex to operate, and the labor intensity is high.

Therefore, according to the actual detection requirements of the double-end mechanical seal industry, the double-end mechanical seal detection device which is small in axial unbalance force, capable of bearing high-pressure test detection, small in main shaft radial run-out, actively controllable in sealing liquid temperature, good in universality and simple and convenient to operate is developed and is used as detection equipment for developing the double-end mechanical seal static pressure running performance test, so that the technical level of the mechanical seal detection equipment is improved, the labor intensity of the mechanical seal detection test is reduced, the standardization of the mechanical seal detection equipment in China is promoted, and the double-end mechanical seal detection device is particularly necessary.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides the test method of the double-end mechanical seal static pressure operation test bed, which has the advantages of reasonable structural design, accurate and reliable test result, good equipment universality, wide application range of detection products, convenient operation and maintenance and capability of effectively reducing the labor intensity of detection tests.

The technical scheme adopted by the invention for solving the problems is as follows: the test method of the double-end-face mechanical seal static pressure operation test bed comprises the double-end-face mechanical seal static pressure operation test bed, wherein the double-end-face mechanical seal static pressure operation test bed comprises a rack, a flat plate, a liquid receiving cavity, a flange cover, a high-pressure cooling tank, a bearing box, a driven belt pulley, a transmission belt, a driving belt pulley, a motor, a replaceable shaft sleeve, a rolling bearing, a mandrel, a transmission main shaft and a pair of tapered roller bearings, the flat plate is installed on the rack, the motor is installed inside the rack, the bearing box is installed on the flat plate, and the high-pressure cooling tank is installed on the flat plate through a bracket and is higher than the bearing box by a certain distance; the transmission main shaft is arranged in the bearing box through a pair of tapered roller bearings; one end of a transmission main shaft is connected with a motor through a driving belt pulley, a driven belt pulley and a transmission belt, the other end of the transmission main shaft is matched and positioned with one end of a mandrel through a central taper hole and is coaxially and fixedly connected through a round nut, and the other end of the mandrel is supported on a flange cover through a rolling bearing; but the coaxial fixed mounting of alternate form axle sleeve is on the dabber, its characterized in that: the double-end-face mechanical seal static pressure operation test bed further comprises a pressure cavity tail section, a pressure cavity head section, a tested static ring seat I, a tested static ring seat II, a tested moving ring and a tested static ring seat, wherein the pressure cavity head section is arranged on the bearing box and enables the pressure cavity head section to be coaxial with a bearing mounting hole of the bearing box; the accompany-testing static ring seat is coaxially fixed on the bearing box, an accompany-testing static ring is arranged in the accompany-testing static ring seat, and an accompany-testing moving ring is fixed on the mandrel and matched with the accompany-testing static ring to form a pair of dynamic seals; the first tested static ring seat is coaxially arranged on the first section of the pressure cavity, the first tested static ring is arranged in the first tested static ring seat, the second tested static ring seat is coaxially arranged on the flange cover, the second tested static ring is arranged in the second tested static ring seat, and the movable ring to be tested is fixed on the replaceable shaft sleeve and matched with the first tested static ring and the second tested static ring to form a pair of double-end-face dynamic seals; the test method of the double-end-face mechanical seal static pressure operation test bed comprises the following specific steps: the first section inner wall of the pressure cavity, the end face of the bearing box, the tested static ring seat, the tested mechanical seal product, the tested static ring seat I and the tested mechanical seal product jointly form a sealed pressure cavity, and the sealed pressure cavity is communicated with the inside of the high-pressure cooling tank through two pipelines which are arranged on the bearing box and are provided with one inlet and one outlet; the inner wall of the tail section of the pressure cavity, the end surface of the head section of the pressure cavity, the first tested static ring seat, the flange cover, the second tested static ring seat and the tested mechanical sealing product form a second sealing cavity together; when the device works, sealing liquid is filled into the sealing pressure cavity by controlling the liquid filling valve and the exhaust valve, sealing oil is filled into the second sealing cavity through the oil filling hole in the tail section of the pressure cavity and the oil filling hole is kept in an open state, the motor drives the transmission main shaft and the mandrel to rotate, the measured movable ring rotates along with the mandrel and forms a pair of measured dynamic seals with the measured static ring, the sealing liquid pressure in the sealing pressure cavity is accurately controlled by controlling the pressurizing valve in the period, and meanwhile, the sealing liquid temperature in the pressure cavity is accurately controlled by controlling the sealing liquid heating device and the cooling coil cooling water flow; the tested mechanical seal product is positioned in the seal oil of the second seal cavity, the end face of the moving ring of the tested moving ring, which is close to the seal pressure cavity, and the tested static ring in the tested static ring seat I form a pair of tested dynamic seals I, the tested dynamic seals I isolate the seal liquid in the seal pressure cavity from the seal oil in the second seal cavity, and the end face of the moving ring of the tested moving ring, which is close to the liquid receiving cavity, and the tested static ring in the tested static ring seat II form a pair of tested dynamic seals II; if the tested dynamic seal at one end of the tested mechanical seal product leaks, sealing liquid in the seal pressure cavity seeps into the second seal cavity to cause the mixed liquid of the sealing liquid and the sealing oil to overflow from the oil injection hole on the tail section of the pressure cavity, if the tested dynamic seal at the other end of the tested mechanical seal product leaks, the sealing oil in the second seal cavity seeps out and flows into the liquid receiving cavity through the flange cover, and therefore whether the tested double-end-face mechanical seal product is qualified or not can be judged according to the product standard by observing whether the leaked liquid seeps out from the oil injection hole and the liquid receiving cavity or not and carrying out weighing measurement or volume measurement on the leaked liquid; and the static pressure operation detection test of each product can be realized only by replacing the replaceable shaft sleeve, the tested static ring seat II and the tested static ring seat I in the face of different specifications and sizes of double-end-face mechanical seal products.

Preferably, the bearing box is provided with a bearing mounting hole for mounting and supporting a transmission main shaft, the bearing box is also provided with a pressure sensor mounting interface and a temperature sensor mounting interface which are directly communicated with the first section of the pressure cavity, and the bearing box is also provided with two pipeline interfaces which are directly communicated with the first section of the pressure cavity and are respectively communicated with the high-pressure cooling tank through an inlet pipeline and an outlet pipeline.

Preferably, the high-pressure cooling tank and the sealing liquid in the first section of the pressure cavity are communicated with each other through two pipelines, a cooling coil for effectively cooling and cooling the sealing liquid and a sealing liquid heating device for effectively heating and warming the sealing liquid are arranged in the cavity in the high-pressure cooling tank, and an exhaust valve, a liquid injection valve, a pressurization valve and a liquid discharge valve which are communicated with the cavity in the tank body are further arranged on the high-pressure cooling tank.

Preferably, the double-end-face mechanical seal static pressure operation test bed further comprises a rotating speed sensor for measuring the rotating speed of the transmission main shaft, and the rotating speed sensor is mounted on the flat plate.

Preferably, the double-end-face mechanical seal static pressure operation test bed further comprises a pressure sensor for measuring the pressure of the sealing liquid in the first section of the pressure cavity, and the pressure sensor is mounted on the bearing box.

Preferably, the double-end-face mechanical seal static pressure operation test bed further comprises a temperature sensor for measuring the temperature of the sealing liquid in the first section of the pressure cavity, and the temperature sensor is mounted on the bearing box.

Preferably, the top of the tail section of the pressure cavity is provided with an oil filling hole, and the bottom of the tail section of the pressure cavity is provided with an oil discharging hole.

Preferably, a bearing mounting through hole is machined in the center of the flange cover.

Compared with the prior art, the invention has the following advantages and effects: (1) one end of the mandrel is matched and positioned with the transmission main shaft through the central taper hole, the other end of the mandrel is supported on the flange cover through the rolling bearing, and the 'simply supported beam' type stable supporting structure effectively reduces radial circular run-out of the mandrel during high-speed operation and improves the overall operation precision of the transmission main shaft and the mandrel, so that the double-end-face mechanical seal static pressure operation test bed has the advantages of high main shaft operation precision and accurate and reliable test results; (2) a set of mechanical seal products for accompanying measurement and a set of mechanical seal products to be measured are simultaneously installed on the mandrel in an opposite direction, so that axial unbalanced force on the transmission main shaft can be effectively counteracted, and the tapered roller bearing for supporting the transmission main shaft can bear larger axial force, therefore, the mechanical seal static pressure operation test bed has the advantages of small axial unbalanced force, high allowable upper limit of pressure and suitability for high-pressure double-end-face mechanical seal product detection; (3) the sealing pressure cavity is communicated with the sealing liquid in the high-pressure cooling tank through a pipeline with one inlet and one outlet, the cooling coil is arranged in the cavity in the high-pressure cooling tank, the cooling coil can effectively cool the sealing liquid based on a thermosiphon principle, and the sealing liquid heating device is also arranged on the high-pressure cooling tank, so that the sealing liquid can be effectively heated, and the mechanical sealing static pressure operation test bed has the advantages of good circulating temperature control effect and capability of accurately controlling the temperature of the sealing liquid; (4) when testing double mechanical seal products with different dimensions, only the replaceable shaft sleeve and two tested static ring seats are required to be replaced by corresponding design, so that product detection tests can be realized, all pipelines communicated with the inside of the seal pressure cavity, the sensor and the like are installed on the bearing box, repeated pipeline disassembly and assembly and parts such as the sensor are not required when replacing the tested mechanical seal products, and therefore the double mechanical seal static pressure operation test bed has the advantages of being good in equipment universality, wide in application range of detection products, convenient to operate and maintain and capable of effectively reducing labor intensity of the detection tests.

Drawings

Fig. 1 is a schematic axial structure diagram of a double-end mechanical seal static pressure operation test bed according to an embodiment of the invention.

Fig. 2 is a schematic sectional structure view of a double-end-face mechanical seal static pressure operation test bed according to an embodiment of the invention.

FIG. 3 is an enlarged view of a portion of a bearing box and a pressure chamber of a double-end mechanical seal static pressure operation test bed according to an embodiment of the present invention.

In the figure: the device comprises a frame 1, a flat plate 2, a liquid receiving cavity 3, a flange cover 4, a pressure cavity tail section 5, a pressure cavity head section 6, a high-pressure cooling tank 7, a bearing box 8, a belt pulley protection cover 9, a rotating speed sensor 10, a pressure sensor 11, a temperature sensor 12, a driven belt pulley 13, a transmission belt 14, a driving belt pulley 15, a motor 16, a replaceable shaft sleeve 17, a measured moving ring 18, a measured static ring seat No. two 19, a rolling bearing 20, a measured static ring seat No. one 21, a measurement accompanying moving ring 22, a measurement accompanying static ring seat 23, a mandrel 24, a tapered roller bearing 25 and a transmission main shaft 26.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Examples are given.

Referring to fig. 1 to 3, the double-end-face mechanical seal static pressure operation test bed of the embodiment includes a frame 1, a flat plate 2, a motor 16, a bearing box 8, a pressure chamber first section 6, a pressure chamber last section 5, a transmission main shaft 26, a tapered roller bearing 25, a mandrel 24, a rolling bearing 20, a replaceable shaft sleeve 17, a flange cover 4, a measured stationary ring seat number one 21, a measured stationary ring seat number two 19, a measured stationary ring seat number two 23, a liquid receiving chamber 3, a high-pressure cooling tank 7, a driving pulley 15, a driven pulley 13, a transmission belt 14, a pulley protection cover 9, a rotation speed sensor 10, a pressure sensor 11, a temperature sensor 12, and various auxiliary components such as valves, pipelines, sealing elements, and fastening elements.

The bearing box 8 in this embodiment is fixedly mounted on the flat plate 2, a bearing mounting through hole is formed in each of the left end face and the right end face of the bearing box 8 and used for mounting and supporting the transmission main shaft 26, three threaded interfaces directly communicated with the pressure chamber head section 6 are further formed in the bearing box 8, the pressure sensor 11, the temperature sensor 12 and the liquid discharge valve are respectively mounted on the threaded interfaces, and the bearing box 8 is further provided with a sealing liquid circulation liquid inlet threaded interface and a sealing liquid circulation liquid outlet threaded interface which are directly communicated with the pressure chamber head section 6 and are respectively communicated with the high-pressure cooling tank 7 through pipelines.

The high-pressure cooling tank 7 in the embodiment is fixedly arranged on the flat plate 2 through a bracket and is higher than the bearing box 8 by a certain distance so as to facilitate thermal circulation based on the thermosiphon principle; a cooling coil is arranged in a cavity in the high-pressure cooling tank 7, a cooling coil water inlet threaded connector and a cooling coil water outlet threaded connector which are respectively communicated with two ends of the internal cooling coil are arranged on the high-pressure cooling tank 7, and the cooling coil can be a copper pipe; the high-pressure cooling tank 7 is additionally provided with a sealing liquid circulating liquid inlet threaded interface communicated with the cavity in the tank body, a sealing liquid circulating liquid outlet threaded interface and corresponding interfaces on the bearing box 8 respectively through pipelines, the high-pressure cooling tank 7 is also provided with a heating device threaded interface communicated with the cavity in the tank body and provided with a sealing liquid heating device, an exhaust threaded interface communicated with the cavity in the tank body and provided with an exhaust valve, a liquid injection threaded interface communicated with the cavity in the tank body and provided with a liquid injection valve, a pressurization threaded interface communicated with the cavity in the tank body and provided with a pressurization valve, a liquid discharge threaded interface communicated with the cavity in the tank body and provided with a liquid discharge valve, and the high-pressure cooling tank 7 is provided with a sealing liquid level observation window; the sealing liquid heating device can be a resistance heating pipe.

The pressure chamber head 6 in this embodiment is fixed to the bearing housing 8 and keeps the pressure chamber head 6 coaxial with the bearing mounting hole of the bearing housing 8.

The pressure cavity tail section 5 in this embodiment is installed on the pressure cavity head section 6 and makes the pressure cavity tail section 5 keep coaxial with the pressure cavity head section 6, and the top of the pressure cavity tail section 5 is provided with an oil filling hole and the bottom is provided with an oil drain hole.

The flange cover 4 in this embodiment is fixed on the pressure chamber tail section 5 and makes the flange cover 4 keep coaxial with the pressure chamber tail section 5, and the processing of flange cover 4 center has the bearing installation through-hole, and still processes the runner through-hole on the flange cover 4 and makes and reveal that sealed oil can flow to connect in the liquid chamber 3 through this runner through-hole.

Connect the liquid chamber 3 in this embodiment to install on blind flange 4 and make and connect liquid chamber 3 to keep coaxial with blind flange 4, connect 3 bottoms in liquid chamber to open to have the through-hole so that reveal during sealed oil flows out to measuring tool, and connect liquid chamber 3 still to process sealed oil and reveal observation window.

The transmission main shaft 26 in this embodiment is installed in the bearing box 8 through a pair of tapered roller bearings 25, one end of the transmission main shaft 26 is connected with the motor 16 through the driven pulley 13, the driving pulley 15 and the transmission belt 14, the other end of the transmission main shaft 26 is matched and positioned with the mandrel 24 through a central taper hole and fastened by a round nut for coaxial fixed connection, and the other end of the mandrel 24 is supported on the flange cover 4 through a rolling bearing 20.

The replaceable shaft sleeve 17 in this embodiment is coaxially and fixedly mounted on the mandrel 24, and the replaceable shaft sleeve 17 adopts a shaft sleeve with a corresponding outer diameter and length according to the specification and the size of a measured double-end-face mechanical seal product.

Accompany and survey quiet ring seat 23 coaxial fixed mounting in this embodiment on bearing box 8, accompany and survey quiet ring seat 23 internally mounted and accompany and survey quiet ring, accompany and survey rotating ring 22 fixed mounting and form a pair of dynamic seal on dabber 24 and accompany and survey quiet ring cooperation.

The coaxial fixed mounting of the quiet ring seat of quilt number one 21 in this embodiment is on pressure chamber first section 6, the quiet ring seat of quilt number one 21 internally mounted of quilt has the quiet ring of quilt number one, the quiet ring seat of quilt number two 19 coaxial fixed mounting of quilt is on flange cover 4, the quiet ring seat of quilt number two 19 internally mounted of quilt is surveyed quiet ring two, but survey rotating ring 18 fixed mounting on alternate form axle sleeve 17 and with survey quiet ring one, the quiet ring two cooperations of quilt form a pair of two terminal surfaces dynamic seal.

Pressure chamber first section 6 and bearing box 8, pressure chamber end section 5 and pressure chamber first section 6, blind flange 4 and pressure chamber end section 5 in this embodiment, connect sap cavity 3 and blind flange 4, accompany and survey quiet ring seat 23 and

bearing box

8, 21 and pressure chamber first section 6 of surveyed quiet ring seat, be surveyed and all install the sealing member when fixed mounting between quiet ring seat No. two 19 and the blind flange 4, select for use O type sealing washer.

The rotation speed sensor 10 in this embodiment is fixed to the plate 2 and measures the rotation speed of the drive spindle 26.

The pressure sensor 11 in this embodiment is mounted on the bearing housing 8 for measuring the pressure of the sealing fluid in the first section 6 of the pressure chamber.

The temperature sensor 12 in this embodiment is mounted on the bearing housing 8 for measuring the temperature of the sealing liquid in the first section 6 of the pressure chamber.

Frame 1 in this embodiment adopts the whole welding frame of steel or aluminum alloy ex-trusions frame, and 1 bottom mount foot stool of frame, 1 all around installation backplate of frame, the inside motor mounting platform that sets up of frame 1.

Dull and stereotyped 2 in this embodiment adopts the casting steel plate, and dull and stereotyped 2 upper surface processes annular escape canal, and dull and stereotyped 2 fixed mounting is in frame 1.

The motor 16 in this embodiment is a variable frequency speed regulating motor, and is installed on a motor installation platform inside the rack 1.

The working principle and the working process of the test of the embodiment are as follows: the inner wall of the first section 6 of the pressure cavity, the end surface of the bearing box 8, the tested static ring seat 23, the tested dynamic ring 22, the first tested static ring seat 21, the tested dynamic ring 18 and the like form a sealed pressure cavity together, meanwhile, the sealing pressure cavity is communicated with the inside of the high-pressure cooling tank 7 through a sealing liquid circulating liquid inlet threaded joint, a sealing liquid circulating liquid outlet threaded joint and corresponding pipelines on the bearing box 8, a thermosiphon effect can be generated between the high-pressure cooling tank 7 and the pressure cavity, so that the sealing liquid in the sealing pressure cavity can automatically perform circulating heat exchange, sealing liquid can be injected into the sealed pressure cavity by controlling a liquid injection valve on the high-pressure cooling tank 7, the sealing pressure in the sealing pressure cavity can be accurately controlled by controlling the pressure valve on the high-pressure cooling tank 7, the temperature of the sealing liquid in the sealing pressure cavity can be accurately controlled by controlling the sealing liquid heating device on the high-pressure cooling tank 7 and the cooling water flow of the cooling coil; the inner wall of the pressure cavity tail section 5, the end surface of the pressure cavity head section 6, the first measured static ring seat 21, the flange cover 4, the second measured static ring seat 19, the measured moving ring 18 and the like jointly form a second sealing cavity, and sealing oil can be injected into the second sealing cavity through an oil injection hole in the pressure cavity tail section 5, so that a mechanical sealing product to be measured is soaked in the sealing oil; when the device works, the sealing pressure cavity is filled with sealing liquid by controlling the liquid injection valve and the exhaust valve, the second sealing cavity is filled with sealing oil by controlling the oil injection hole on the tail section 5 of the pressure cavity and the oil injection hole is kept in an open state, the motor 16 drives the transmission main shaft 26 and the mandrel 24 to rotate, the measured movable ring 22 rotates along with the mandrel 24 and forms a pair of measured dynamic seals with the measured static ring, the sealing liquid pressure in the sealing pressure cavity is accurately controlled by controlling the pressurizing valve during the period, and meanwhile, the sealing liquid temperature in the pressure cavity is accurately controlled by controlling the sealing liquid heating device and the cooling coil cooling running water; the tested mechanical sealing product is positioned in the sealing oil of the second sealing cavity, the end face of the moving ring of the tested moving ring 22, which is close to the sealing pressure cavity, and the tested static ring in the tested static ring seat No. 21 form a pair of tested moving seals I, the tested moving seals I isolate the sealing liquid in the sealing pressure cavity from the sealing oil in the second sealing cavity, and the end face of the moving ring of the tested moving ring 22, which is close to the liquid receiving cavity 3, and the tested static ring in the tested static ring seat No. 19 form a pair of tested moving seals II; if the tested dynamic seal at one end of the tested mechanical seal product leaks, sealing liquid in the seal pressure cavity seeps into the second seal cavity to cause the mixed liquid of the sealing liquid and the sealing oil to overflow from the oil filling hole on the tail section 5 of the pressure cavity, if the tested dynamic seal at the other end of the tested mechanical seal product leaks, the sealing oil in the second seal cavity seeps out and flows into the liquid receiving cavity 3 through the flange cover 4, and therefore whether the tested double-end-face mechanical seal product is qualified or not can be judged according to product standards by observing whether the leaked liquid seeps out from the oil filling hole and the liquid receiving cavity 3 or not and carrying out weighing measurement or volume measurement on the leaked liquid; and the static pressure operation detection test of each product can be realized only by replacing the replaceable shaft sleeve 17 and the tested

static ring seats

19 and 21 facing different specifications and sizes of double-end-face mechanical sealing products.

One end of a mandrel 24 of the double-end-face mechanical seal static pressure operation test bed is matched and positioned with a transmission main shaft 26 through a central taper hole, the other end of the mandrel 24 is supported on a flange cover 4 through a rolling bearing 20, and the 'simply supported beam' type stable supporting structure effectively reduces radial circular runout of the mandrel 24 during high-speed operation and improves the overall operation precision of the transmission main shaft 26 and the mandrel 24, so that the double-end-face mechanical seal static pressure operation test bed has the advantages of high main shaft operation precision, accurate and reliable test results and the like.

In this embodiment, the spindle 24 is simultaneously installed with a set of mechanical seal product to be tested and a set of mechanical seal product to be tested in opposite directions, so that the axial unbalance force on the transmission main shaft 26 can be effectively counteracted, and the tapered roller bearing 25 supporting the transmission main shaft 26 can bear a larger axial force, so that the tapered roller bearing has the advantages of small axial unbalance force, high upper limit of allowable pressure, suitability for high-pressure double-end-face mechanical seal product detection and the like.

Sealing pressure chamber and the sealing liquid in the high pressure cooling jar 7 in this embodiment communicate each other through one advances two pipelines of one play, and install cooling coil in the 7 inside cavities of high pressure cooling jar and can carry out effective cooling to sealing liquid based on the thermosiphon principle, cooling coil chooses the copper pipe for use, still install sealing liquid heating device on the high pressure cooling jar 7 simultaneously and can carry out effective heating to sealing liquid and heat up, consequently, have the circulation temperature control effectual, but advantages such as accurate control sealing liquid temperature.

But this embodiment double mechanical seal static pressure operation test bench only needs corresponding design to change alternate form axle sleeve 17 and surveyed quiet ring seat 19 No. two to the double mechanical seal product test of different size specifications, 21 can realize product detection test by the quiet ring seat of survey, and all with the pipeline of the inside intercommunication of sealed pressure chamber, the sensor etc. are all installed on bearing box 8, need not repeated dismouting pipeline when making to change the surveyed mechanical seal product, spare parts such as sensor, consequently, it is good to have the equipment commonality, it is wide to be suitable for to detect the product scope, the operation maintenance is convenient, can effectively alleviate advantages such as detection test intensity of labour.

In conclusion, the double-end-face mechanical seal static pressure operation test bed and the test method have the advantages of small axial unbalance force, capability of bearing high-pressure test detection, small radial runout of the main shaft, actively controllable temperature of the sealing liquid, good universality, simplicity and convenience in operation and the like, are very suitable for being used as standard detection equipment for carrying out double-end-face mechanical seal static pressure operation performance tests, and can effectively improve the technical level of the mechanical seal detection equipment, reduce the labor intensity of the mechanical seal detection test and promote the standardization of the mechanical seal detection equipment in China.

And will be apparent to those skilled in the art from the foregoing description.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A test method of a double-end-face mechanical seal static pressure operation test bed comprises a double-end-face mechanical seal static pressure operation test bed, the double-end-face mechanical seal static pressure operation test bed comprises a frame (1), a flat plate (2), a liquid receiving cavity (3), a flange cover (4), a high-pressure cooling tank (7), a bearing box (8), a driven belt pulley (13), a transmission belt (14), a driving belt pulley (15), a motor (16), a replaceable shaft sleeve (17), a rolling bearing (20), a mandrel (24), a transmission main shaft (26) and a pair of tapered roller bearings (25), the flat plate (2) is arranged on the rack (1), the motor (16) is arranged in the rack (1), the bearing box (8) is arranged on the flat plate (2), and the high-pressure cooling tank (7) is arranged on the flat plate (2) through a support and is higher than the bearing box (8) by a certain distance; the transmission main shaft (26) is arranged in the bearing box (8) through a pair of tapered roller bearings (25); one end of a transmission main shaft (26) is connected with a motor (16) through a driving belt pulley (15), a driven belt pulley (13) and a transmission belt (14), the other end of the transmission main shaft (26) is matched and positioned with one end of a mandrel (24) through a central taper hole and is coaxially and fixedly connected through a round nut, and the other end of the mandrel (24) is supported on the flange cover (4) through a rolling bearing (20); but substitution axle sleeve (17) coaxial fixed mounting on dabber (24), its characterized in that: the double-end-face mechanical seal static pressure operation test bed further comprises a pressure cavity tail section (5), a pressure cavity head section (6), a tested static ring seat I (21), a tested static ring seat II (19), a tested dynamic ring (18), a tested dynamic ring (22) and a tested static ring seat (23), wherein the pressure cavity head section (6) is installed on the bearing box (8) and enables the pressure cavity head section (6) to be coaxial with a bearing installation hole of the bearing box (8), the pressure cavity tail section (5) is installed on the pressure cavity head section (6) and enables the pressure cavity tail section (5) to be coaxial with the pressure cavity head section (6), the flange cover (4) is installed on the pressure cavity tail section (5) and enables the flange cover (4) to be coaxial with the pressure cavity tail section (5), and the liquid receiving cavity (3) is installed on the flange cover (4) and enables the liquid receiving cavity (3) to be coaxial with the flange cover (4); the accompany-testing static ring seat (23) is coaxially fixed on the bearing box (8), an accompany-testing static ring is arranged in the accompany-testing static ring seat (23), and an accompany-testing moving ring (22) is fixed on the mandrel (24) and matched with the accompany-testing static ring to form a pair of moving seals; the first tested static ring seat (21) is coaxially arranged on the first section (6) of the pressure cavity, the first tested static ring seat (21) is internally provided with a first tested static ring, the second tested static ring seat (19) is coaxially arranged on the flange cover (4), the second tested static ring seat (19) is internally provided with a second tested static ring, and the movable ring (18) to be tested is fixed on the replaceable shaft sleeve (17) and is matched with the first tested static ring and the second tested static ring to form a pair of double-end-face dynamic seals; the test method of the double-end-face mechanical seal static pressure operation test bed comprises the following specific steps: the inner wall of the first section (6) of the pressure cavity, the end face of the bearing box (8), the tested static ring seat (23), the tested mechanical seal product, the tested static ring seat I (21) and the tested mechanical seal product jointly form a sealed pressure cavity, and the sealed pressure cavity is communicated with the inside of the high-pressure cooling tank (7) through two pipelines which are arranged on the bearing box (8) and are arranged in a one-in-one-out mode; a second sealing cavity is formed by the inner wall of the pressure cavity tail section (5), the end surface of the pressure cavity head section (6), the first tested static ring seat (21), the flange cover (4), the second tested static ring seat (19) and the tested mechanical sealing product; when the device works, sealing liquid is filled into a sealing pressure cavity by controlling a liquid filling valve and an exhaust valve, sealing oil is filled into a second sealing cavity through an oil hole in a tail section (5) of the pressure cavity and the oil hole is kept in an open state, a motor (16) drives a transmission main shaft (26) and a mandrel (24) to rotate, a measured movable ring (18) rotates along with the mandrel (24) and forms a pair of measured dynamic seals with a measured static ring, and during the period, the sealing liquid pressure in the sealing pressure cavity is accurately controlled by controlling a pressurizing valve, and meanwhile, the temperature of the sealing liquid in the pressure cavity is accurately controlled by controlling a sealing liquid heating device and cooling coil cooling running water; the tested mechanical sealing product is positioned in the sealing oil of the second sealing cavity, a first tested dynamic seal is formed by a first tested static ring in a first tested static ring seat (21) and a moving ring end surface of a tested moving ring (18) close to the sealing pressure cavity, sealing liquid in the sealed pressure cavity and sealing oil in the second sealing cavity are isolated by the first tested dynamic seal, and a second tested dynamic seal is formed by a second tested static ring in a second tested static ring seat (19) and a moving ring end surface of a tested moving ring (18) close to the liquid receiving cavity (3); if the tested dynamic seal at one end of the tested mechanical seal product leaks, sealing liquid in the sealing pressure cavity seeps into the second sealing cavity to further cause the mixed liquid of the sealing liquid and the sealing oil to overflow from the oil filling hole on the tail section (5) of the pressure cavity, if the tested dynamic seal at the other end of the tested mechanical seal product leaks, sealing oil in the second sealing cavity seeps out and flows into the liquid receiving cavity (3) through the flange cover (4), and therefore whether the tested double-end-face mechanical seal product is qualified or not can be judged according to the product standard by observing whether the leaked liquid seeps out from the oil filling hole and the liquid receiving cavity (3) or not and carrying out weighing measurement or volume measurement on the leaked liquid; and the static pressure operation detection test of each product can be realized only by replacing the replaceable shaft sleeve (17), the tested static ring seat II (19) and the tested static ring seat I (21) facing to the double-end-face mechanical seal products with different specifications and sizes.

2. The method of testing a double mechanical seal hydrostatic run test stand of claim 1, wherein: the bearing box (8) is provided with a bearing mounting hole for mounting and supporting a transmission main shaft (26), the bearing box (8) is also provided with a pressure sensor mounting interface and a temperature sensor mounting interface which are directly communicated with the pressure cavity first section (6), and the bearing box (8) is also provided with two pipeline interfaces which are directly communicated with the pressure cavity first section (6) and are respectively communicated with the high-pressure cooling tank (7) through a pipeline with one inlet and one outlet.

3. The method of testing a double mechanical seal hydrostatic run test stand of claim 1, wherein: sealing liquid in high-pressure cooling tank (7) and pressure chamber first section (6) feeds through each other through one advances two pipelines of going out, and installs in the inside cavity of high-pressure cooling tank (7) and carry out the cooling coil who effectively cools down to sealing liquid and carry out the sealing liquid heating device that effectively heats up to sealing liquid, still installs exhaust valve, notes liquid valve, pressurization valve, the flowing back valve with jar internal cavity intercommunication on this high-pressure cooling tank (7).

4. The method of testing a double mechanical seal hydrostatic run test stand of claim 1, wherein: the double-end-face mechanical seal static pressure operation test bed further comprises a rotating speed sensor (10) used for measuring the rotating speed of the transmission main shaft (26), and the rotating speed sensor (10) is installed on the flat plate (2).

5. The method of testing a double mechanical seal hydrostatic run test stand of claim 1, wherein: the double-end-face mechanical seal static pressure operation test bed further comprises a pressure sensor (11) used for measuring the pressure of the sealing liquid in the first section (6) of the pressure cavity, and the pressure sensor (11) is installed on the bearing box (8).

6. The method of testing a double mechanical seal hydrostatic run test stand of claim 1, wherein: the double-end-face mechanical seal static pressure operation test bed further comprises a temperature sensor (12) used for measuring the temperature of sealing liquid in the first section (6) of the pressure cavity, and the temperature sensor (12) is installed on the bearing box (8).

7. The method of testing a double mechanical seal hydrostatic run test stand of claim 1, wherein: the top of the pressure cavity tail section (5) is provided with an oil filling hole, and the bottom of the pressure cavity tail section is provided with an oil discharging hole.

8. The method of testing a double mechanical seal hydrostatic run test stand of claim 1, wherein: and a bearing mounting through hole is processed in the center of the flange cover (4).