Test method of double mechanical seal static pressure operation test bench

Abstract

The present invention relates to a test method for a double-end mechanical seal static pressure operation test bench, which belongs to the technical field of detection equipment. The present invention includes a bearing box, a pressure chamber first section, a pressure chamber tail section, a transmission main shaft, a core shaft, a replaceable sleeve, a flange cover, a liquid receiving chamber, a high-pressure cooling tank, etc. The pressure chamber first section is installed on the bearing box and constitutes a sealed pressure chamber, the pressure chamber tail section is installed on the pressure chamber first section and constitutes a second sealed chamber, one end of the core shaft is positioned with the transmission main shaft through a central cone hole, and the other end of the core shaft is supported by a rolling bearing. A set of accompanying test products and a set of tested mechanical seal products are installed on the core shaft at the same time, and the sealed pressure chamber and the high-pressure cooling tank are connected to each other through a pipeline. During operation, the detection test of double-end mechanical seal products of different sizes can be realized by replacing the replaceable sleeve. The present invention has the advantages of high spindle operation accuracy, high upper limit of allowable pressure, good cycle temperature control effect, wide range of applicable detection products, and convenient operation and maintenance.

Description

Technical Field

[0001] The invention relates to a test bench and a test method, in particular to a test method of a double-end mechanical seal static pressure operation test bench, and belongs to the technical field of detection equipment. Background Art

[0002] Mechanical seals, also known as end seals, are a type of shaft sealing device for rotating machinery. They are mainly composed of a dynamic ring (rotating ring) and a static ring (stationary ring). They are widely used in centrifugal pumps, centrifuges, reactors, compressors and other equipment. As a core component to prevent leakage, the quality of mechanical seals directly affects the performance and service life of these equipment to a large extent. Therefore, the reliability of mechanical seals is particularly important, and the corresponding research on mechanical seal detection technology is also of great significance.

[0003] Mechanical seal products can be divided into single-end mechanical seals, double-end mechanical seals and other types according to different structural forms. Double-end mechanical seals are a kind of rotary shaft seal device widely used in submersible pump products. The industry mainly conducts mechanical seal static pressure operation tests for double-end mechanical seal products to detect the leakage of mechanical seal products in both static and rotating states and judge whether the mechanical seal products are qualified based on this.

[0004] A Chinese patent with publication date of June 5, 2020 and publication number CN111238741A discloses an invention patent entitled "A mechanical seal detection device and flushing detection process". The patent designs a pump bracket and installs the pump casing on the bracket to form a pressure chamber. The static ring is installed on the pump casing and the dynamic ring is installed on the pump shaft. After analysis, the patent device has the following deficiencies: (1) Only the mechanical seal product to be tested is installed on the pump shaft, which will generate a large axial unbalanced force and thus damage the detection device. It is especially not suitable for high-pressure mechanical seal product testing (the greater the pressure, the greater the axial unbalanced force); (2) The end of the pump shaft where the mechanical seal product is installed is suspended in the air without any support. When the pump shaft rotates at high speed, it is easy to generate large radial circular runout, reduce the operation accuracy, and even reduce the reliability of the test results (large radial runout of the pump shaft will cause the mechanical seal to leak and mislead the test results); (3) The detection device lacks a sealing liquid heating or cooling mechanism and cannot actively control the sealing liquid temperature; (4) The detection device cannot be used for double-end mechanical seal product testing, but can only be used for conventional single-end mechanical seal product testing. In addition, the detection device has poor versatility. For mechanical seal products of different sizes, it is necessary to replace the corresponding pump shaft, pump casing and other parts, which is cumbersome and labor-intensive.

[0005] Therefore, according to the actual testing needs of the double-face mechanical seal industry, it is particularly necessary to develop a double-face mechanical seal testing device with small axial unbalanced force, ability to withstand high-pressure testing, small spindle radial runout, active and controllable sealing liquid temperature, good versatility, and easy operation as a testing equipment for conducting static pressure operation performance tests of double-face mechanical seals, in order to improve the technical level of mechanical seal testing equipment, reduce the labor intensity of mechanical seal testing, and promote the standardization of mechanical seal testing equipment in my country. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a test method for a double-end mechanical seal static pressure operation test bench which has a reasonable structural design, accurate and reliable test results, good equipment versatility, a wide range of applicable products for testing, convenient operation and maintenance, and can effectively reduce the labor intensity of testing.

[0007] The technical solution adopted by the present invention to solve the above-mentioned problem is: the test method of the double-end mechanical seal static pressure operation test bench includes the double-end mechanical seal static pressure operation test bench, the double-end mechanical seal static pressure operation test bench includes a frame, a plate, a liquid receiving chamber, a flange cover, a high-pressure cooling tank, a bearing box, a driven pulley, a transmission belt, a driving pulley, a motor, a replaceable sleeve, a rolling bearing, a core shaft, a transmission main shaft and a pair of tapered roller bearings, the plate is installed on the frame, the motor is installed inside the frame, the bearing box is installed on the plate, the high-pressure cooling tank is installed on the plate through a bracket and is higher than the bearing box by a certain distance; the transmission main shaft is connected to the plate by a pair of tapered roller bearings. The bearing is installed in the bearing box; one end of the transmission main shaft is connected to the motor through the driving pulley, the driven pulley and the transmission belt, the other end of the transmission main shaft is positioned with one end of the core shaft through the center cone hole and is coaxially fixedly connected with a round nut, and the other end of the core shaft is supported on the flange cover through a rolling bearing; the replaceable sleeve is coaxially fixedly installed on the core shaft, characterized in that: the double-end mechanical seal static pressure operation test bench also includes a pressure chamber tail section, a pressure chamber head section, a measured static ring seat No. 1, a measured static ring seat No. 2, a measured dynamic ring, a measured accompanying dynamic ring and a measured accompanying static ring seat, the pressure chamber head section is installed on the bearing box and keeps the pressure chamber head section coaxial with the bearing mounting hole of the bearing box, the pressure chamber head section is installed on the bearing box, and the pressure chamber head section is kept coaxial with the bearing mounting hole of the bearing box. The tail section of the force chamber is installed on the first section of the pressure chamber and keeps the tail section of the pressure chamber coaxial with the first section of the pressure chamber, the flange cover is installed on the tail section of the pressure chamber and keeps the flange cover coaxial with the tail section of the pressure chamber, and the liquid receiving chamber is installed on the flange cover and keeps the liquid receiving chamber coaxial with the flange cover; the accompanying static ring seat is coaxially fixed on the bearing box, and the accompanying static ring is installed inside the accompanying static ring seat, and the accompanying dynamic ring is fixed on the core shaft and cooperates with the accompanying static ring to form a pair of dynamic seals; the measured static ring seat No. 1 is coaxially installed on the first section of the pressure chamber, and the measured static ring No. 1 is installed inside the measured static ring seat No. 1, and the measured static ring seat No. 2 is coaxially installed on the flange cover, and the measured static ring No. 2 is installed inside the measured static ring seat No. 2. The dynamic ring is fixed on the replaceable shaft sleeve and cooperates with the static ring 1 and the static ring 2 to be tested to form a pair of double-end dynamic seals; the specific steps of the test method of the double-end mechanical seal static pressure operation test bench are as follows: the inner wall of the first section of the pressure chamber, the end face of the bearing box, the static ring seat to be tested, the mechanical seal product to be tested, the static ring seat No. 1 to be tested, and the mechanical seal product to be tested together constitute a sealed pressure chamber, and the sealed pressure chamber is connected to the inside of the high-pressure cooling tank through two inlet and outlet pipelines installed on the bearing box; the inner wall of the tail section of the pressure chamber, the end face of the first section of the pressure chamber, the static ring seat No. 1 to be tested, the flange cover, the static ring seat No. 2 to be tested, and the mechanical seal product to be tested together constitute a second sealed chamber;During operation, the sealing liquid is filled into the sealing pressure chamber by controlling the injection valve and the exhaust valve, and the sealing oil is filled into the second sealing chamber through the oil injection hole on the tail section of the pressure chamber and the oil injection hole is kept in an open state. The motor drives the transmission main shaft and the core shaft to rotate, and the measured dynamic ring rotates with the core shaft and forms a pair of measured dynamic seals with the measured static ring. During this period, the sealing liquid pressure in the sealing pressure chamber is accurately controlled by controlling the pressurization valve, and the sealing liquid temperature in the pressure chamber is accurately controlled by controlling the sealing liquid heating device and the cooling coil cooling water. The measured mechanical seal product is in the sealing oil of the second sealing chamber, and the measured dynamic ring is close to the dynamic ring end face of the sealing pressure chamber to form a pair of measured dynamic seals with the measured static ring one in the measured static ring seat one. The measured dynamic seal one isolates the sealing liquid in the sealing pressure chamber from the sealing oil in the second sealing chamber, and the measured dynamic ring is close to the dynamic ring of the liquid receiving chamber. The end face and the tested static ring 2 in the tested static ring seat 2 form a pair of tested dynamic seal 2; if the tested dynamic seal 1 at one end of the tested mechanical seal product leaks, the sealing liquid in the sealing pressure chamber will seep into the second sealing chamber, causing the mixture of sealing liquid and sealing oil to overflow from the oil filling hole on the tail section of the pressure chamber; if the tested dynamic seal 2 at the other end of the tested mechanical seal product leaks, the sealing oil in the second sealing chamber will seep out and flow into the liquid receiving chamber through the flange cover. Therefore, by observing whether there is leakage in the oil filling hole and the liquid receiving chamber and weighing or volume measuring them, it can be determined whether the tested double-end mechanical seal product is qualified according to the product standard; and for double-end mechanical seal products of different specifications and sizes, it is only necessary to replace the replaceable shaft sleeve and the tested static ring seat 2 and the tested static ring seat 1 to realize the static pressure operation test of each product. ;

[0008] Preferably, the bearing box of the present invention is provided with a bearing mounting hole for mounting a supporting transmission main shaft, the bearing box is also provided with a pressure sensor mounting interface and a temperature sensor mounting interface directly connected to the first section of the pressure chamber, and the bearing box is also provided with two pipeline interfaces directly connected to the first section of the pressure chamber and are connected to the high-pressure cooling tank through two pipelines, one inlet and one outlet, respectively.

[0009] Preferably, the high-pressure cooling tank of the present invention is connected to the sealing liquid in the first section of the pressure chamber by two pipelines, one inlet and one outlet, and a cooling coil for effectively cooling the sealing liquid and a sealing liquid heating device for effectively heating the sealing liquid are installed in the internal cavity of the high-pressure cooling tank. The high-pressure cooling tank is also equipped with an exhaust valve, a liquid injection valve, a pressurizing valve and a liquid discharge valve connected to the internal cavity of the tank body.

[0010] Preferably, the double-end mechanical seal static pressure operation test bench of the present invention further comprises a speed sensor for measuring the rotation speed of the transmission main shaft, and the speed sensor is installed on the flat plate.

[0011] Preferably, the double-end mechanical seal static pressure operation test bench of the present invention further comprises a pressure sensor for measuring the sealing liquid pressure in the first section of the pressure chamber, and the pressure sensor is mounted on the bearing box.

[0012] Preferably, the double-end mechanical seal static pressure operation test bench of the present invention further comprises a temperature sensor for measuring the temperature of the sealing liquid in the first section of the pressure chamber, and the temperature sensor is mounted on the bearing box.

[0013] Preferably, the tail section of the pressure chamber of the present invention has an oil filling hole at the top and an oil drain hole at the bottom.

[0014] Preferably, a bearing mounting through hole is processed in the center of the flange cover of the present invention.

[0015] Compared with the prior art, the present invention has the following advantages and effects: (1) One end of the core shaft is positioned with the transmission main shaft through the central tapered hole, and the other end of the core shaft is supported on the flange cover through a rolling bearing. The "simply supported beam" type stable support structure effectively reduces the radial circular runout of the core shaft during high-speed operation and improves the overall operation accuracy of the transmission main shaft and the core shaft. Therefore, the double-end mechanical seal static pressure operation test bench has the advantages of high spindle operation accuracy and accurate and reliable test results; (2) A set of accompanying mechanical seal products and a set of mechanical seal products to be tested are installed on the core shaft at the same time, which can effectively offset the axial unbalanced force on the transmission main shaft, and the tapered roller bearing supporting the transmission main shaft can withstand a large axial force. Therefore, the mechanical seal static pressure operation test bench has the advantages of small axial unbalanced force, high upper limit of allowable pressure, and can be applied to the detection of high-pressure double-end mechanical seal products; (3) The sealing pressure chamber and the sealing liquid in the high-pressure cooling tank are connected through the sealing pressure chamber. The two inlet and outlet pipes are interconnected, and a cooling coil is installed in the internal cavity of the high-pressure cooling tank. Based on the thermal siphon principle, the sealing liquid can be effectively cooled and cooled. At the same time, a sealing liquid heating device is installed on the high-pressure cooling tank to effectively heat the sealing liquid. Therefore, the mechanical seal static pressure operation test bench has the advantages of good circulation temperature control effect and accurate control of the sealing liquid temperature; (4) When testing double-end mechanical seal products of different sizes, it is only necessary to design and replace the replaceable shaft sleeve and the two static ring seats to be tested to realize the product inspection test, and all the pipes, sensors, etc. connected to the inside of the sealing pressure chamber are installed on the bearing box, so that when replacing the mechanical seal product to be tested, there is no need to repeatedly disassemble and install pipes, sensors and other parts. Therefore, the double-end mechanical seal static pressure operation test bench has the advantages of good equipment versatility, a wide range of applicable test products, convenient operation and maintenance, and can effectively reduce the labor intensity of inspection and testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the axonometric structure of a double-end mechanical seal static pressure operation test bench according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic cross-sectional structure diagram of a double-end mechanical seal static pressure operation test bench according to an embodiment of the present invention.

[0018] Figure 3 It is a schematic enlarged view of the partial cross-sectional structure of the bearing box and the pressure chamber part of the double-end mechanical seal static pressure operation test bench according to an embodiment of the present invention.

[0019] In the figure: frame 1, plate 2, liquid receiving chamber 3, flange cover 4, pressure chamber tail section 5, pressure chamber head section 6, high-pressure cooling tank 7, bearing box 8, pulley protection cover 9, speed sensor 10, pressure sensor 11, temperature sensor 12, driven pulley 13, transmission belt 14, driving pulley 15, motor 16, replaceable sleeve 17, measured dynamic ring 18, measured static ring seat No. 2 19, rolling bearing 20, measured static ring seat No. 1 21, accompanied measured dynamic ring 22, accompanied measured static ring seat 23, core shaft 24, tapered roller bearing 25, transmission main shaft 26. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0021] Example

[0022] See also Figures 1 to 3 The double-end mechanical seal static pressure operation test bench of this embodiment includes a frame 1, a plate 2, a motor 16, a bearing box 8, a pressure chamber first section 6, a pressure chamber tail section 5, a transmission main shaft 26, a tapered roller bearing 25, a core shaft 24, a rolling bearing 20, a replaceable sleeve 17, a flange cover 4, a measured static ring seat No. 1 21, a measured static ring seat No. 2 19, a test accompanying static ring seat 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 speed sensor 10, a pressure sensor 11, a temperature sensor 12 and various valves, pipelines, seals, fasteners and other auxiliary components.

[0023] The bearing box 8 in this embodiment is fixedly installed on the flat plate 2. A bearing installation through hole is respectively provided on the left and right end surfaces of the bearing box 8 for installing the supporting transmission main shaft 26. The bearing box 8 is also provided with three threaded interfaces directly connected to the first section 6 of the pressure chamber and respectively installed with a pressure sensor 11, a temperature sensor 12, and a drain valve. The bearing box 8 is also provided with a sealing liquid circulation inlet threaded interface and a sealing liquid circulation outlet threaded interface directly connected to the first section 6 of the pressure chamber, and are respectively connected to the high-pressure cooling tank 7 through pipelines.

[0024] The high-pressure cooling tank 7 in this embodiment is fixedly mounted on the flat plate 2 by a bracket and is higher than the bearing box 8 by a certain distance, so as to facilitate the heat circulation based on the thermal siphon principle; a cooling coil is installed in the internal cavity of the high-pressure cooling tank 7, and a cooling coil water inlet threaded interface and a cooling coil water outlet threaded interface respectively connected to the two ends of the internal cooling coil are opened on the high-pressure cooling tank 7, and a copper tube can be used for the cooling coil; the high-pressure cooling tank 7 is also provided with a sealing liquid circulation inlet threaded interface and a sealing liquid circulation outlet threaded interface connected to the internal cavity of the tank body, and they are respectively connected to the corresponding ones on the bearing box 8 through pipelines. In addition, the high-pressure cooling tank 7 is provided with a heating device threaded interface connected to the internal cavity of the tank body and a sealing liquid heating device is installed, an exhaust threaded interface connected to the internal cavity of the tank body and an exhaust valve is installed, an injection threaded interface connected to the internal cavity of the tank body and an injection valve is installed, a pressurizing threaded interface connected to the internal cavity of the tank body and a pressurizing valve is installed, a drain threaded interface connected to the internal cavity of the tank body and a drain valve is installed, and the high-pressure cooling tank 7 is designed with a sealing liquid level observation window; the sealing liquid heating device can choose a resistive heating tube.

[0025] In this embodiment, the first section 6 of the pressure chamber is fixed on the bearing box 8 so that the first section 6 of the pressure chamber remains coaxial with the bearing mounting hole of the bearing box 8 .

[0026] In this embodiment, the pressure chamber tail section 5 is installed on the pressure chamber head section 6 and keeps the pressure chamber tail section 5 coaxial with the pressure chamber head section 6, and an oil filling hole is opened at the top of the pressure chamber tail section 5 and an oil discharge hole is opened at the bottom.

[0027] The flange cover 4 in this embodiment is fixed on the tail section 5 of the pressure chamber and keeps the flange cover 4 coaxial with the tail section 5 of the pressure chamber. A bearing mounting through hole is processed at the center of the flange cover 4, and a flow channel through hole is also processed on the flange cover 4 so that the leaked sealing oil can flow out into the liquid receiving chamber 3 through the flow channel through hole.

[0028] The liquid receiving chamber 3 in this embodiment is installed on the flange cover 4 and keeps the liquid receiving chamber 3 coaxial with the flange cover 4. A through hole is opened at the lowest point of the bottom of the liquid receiving chamber 3 to allow the leaked sealing oil to flow out into the metering tool, and the liquid receiving chamber 3 is also processed with a sealing oil leakage observation window.

[0029] 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 to 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 positioned with the core shaft 24 through the center tapered hole and is coaxially fixedly connected by fastening with a round nut. The other end of the core shaft 24 is supported on the flange cover 4 through a rolling bearing 20.

[0030] The replaceable sleeve 17 in this embodiment is coaxially fixedly mounted on the core shaft 24. The replaceable sleeve 17 has a sleeve with a corresponding outer diameter and length according to the specifications of the double-end mechanical seal product to be tested.

[0031] The accompanying static ring seat 23 in this embodiment is coaxially fixedly installed on the bearing box 8, and an accompanying static ring is installed inside the accompanying static ring seat 23. The accompanying dynamic ring 22 is fixedly installed on the core shaft 24 and cooperates with the accompanying static ring to form a pair of dynamic seals.

[0032] The measured static ring seat No. 1 21 in this embodiment is coaxially fixedly installed on the first section 6 of the pressure chamber, the measured static ring seat No. 1 21 has the measured static ring 1 installed inside, the measured static ring seat No. 2 19 is coaxially fixedly installed on the flange cover 4, the measured static ring seat No. 2 19 has the measured static ring 2 installed inside, the measured dynamic ring 18 is fixedly installed on the replaceable shaft sleeve 17 and cooperates with the measured static rings 1 and 2 to form a pair of double-end dynamic seals.

[0033] In this embodiment, sealing components should be installed when fixing and installing between the pressure chamber first section 6 and the bearing box 8, the pressure chamber tail section 5 and the pressure chamber first section 6, the flange cover 4 and the pressure chamber tail section 5, the liquid receiving chamber 3 and the flange cover 4, the accompanying static ring seat 23 and the bearing box 8, the measured static ring seat No. 1 21 and the pressure chamber first section 6, and the measured static ring seat No. 2 19 and the flange cover 4, and O-rings are used.

[0034] The rotation speed sensor 10 in this embodiment is fixed on the flat plate 2 and is used to measure the rotation speed of the transmission main shaft 26 .

[0035] The pressure sensor 11 in this embodiment is installed on the bearing box 8 and is used to measure the sealing liquid pressure in the first section 6 of the pressure chamber.

[0036] The temperature sensor 12 in this embodiment is installed on the bearing box 8 and is used to measure the temperature of the sealing liquid in the first section 6 of the pressure chamber.

[0037] The frame 1 in this embodiment is a steel integrally welded frame or an aluminum alloy profile frame, a foot base is installed at the bottom of the frame 1, a guard plate is installed around the frame 1, and a motor installation platform is arranged inside the frame 1.

[0038] The flat plate 2 in this embodiment is made of a cast thick steel plate, an annular drainage groove is processed on the upper surface of the flat plate 2, and the flat plate 2 is fixedly mounted on the frame 1.

[0039] The motor 16 in this embodiment is a variable frequency speed regulating motor, which is installed on the motor mounting platform inside the frame 1.

[0040] The working principle of this embodiment and the working process of the test are as follows: the inner wall of the first section 6 of the pressure chamber, the end face of the bearing box 8, the accompanying test static ring seat 23, the accompanying test dynamic ring 22, the tested static ring seat No. 1 21, the tested dynamic ring 18, etc. together constitute a sealed pressure chamber, and at the same time, the sealed pressure chamber is connected to the interior of the high-pressure cooling tank 7 through the sealing liquid circulation inlet threaded interface, the sealing liquid circulation outlet threaded interface and the corresponding pipeline on the bearing box 8. A thermal siphon effect will be generated between the high-pressure cooling tank 7 and the pressure chamber, so that the sealing liquid in the sealed pressure chamber will automatically circulate and exchange heat. The sealing liquid can be injected into the sealed pressure chamber by controlling the injection valve on the high-pressure cooling tank 7, and the sealing liquid in the sealed pressure chamber can be accurately controlled by controlling the pressurization valve on the high-pressure cooling tank 7. Pressure, by controlling the sealing liquid heating device on the high-pressure cooling tank 7 and the cooling water of the cooling coil, the sealing liquid temperature in the sealing pressure chamber can be accurately controlled; the inner wall of the pressure chamber tail section 5, the end face of the pressure chamber head section 6, the measured static ring seat No. 1 21, the flange cover 4, the measured static ring seat No. 2 19, the measured dynamic ring 18, etc. together constitute a second sealing chamber, and sealing oil can be injected into the second sealing chamber through the oil filling hole on the pressure chamber tail section 5, so that the measured mechanical seal product is immersed in the sealing oil; when working, the sealing liquid is filled into the sealing pressure chamber by controlling the injection valve and the exhaust valve, and the sealing oil is filled into the second sealing chamber through the oil filling hole on the pressure chamber tail section 5 and the oil filling hole is kept in an open state, and the motor 16 drives the transmission main shaft 26 and the core shaft 24 to rotate The tested dynamic ring 22 rotates with the core shaft 24 and forms a pair of tested dynamic seals with the tested static ring. During this period, the sealing liquid pressure in the sealing pressure chamber is accurately controlled by controlling the pressurizing valve, and the sealing liquid temperature in the pressure chamber is accurately controlled by controlling the sealing liquid heating device and the cooling coil cooling water. The tested mechanical seal product is in the sealing oil of the second sealing chamber, and the tested dynamic ring 22 is close to the dynamic ring end face of the sealing pressure chamber and forms a pair of tested dynamic seals with the tested static ring one in the tested static ring seat No. 1 21. The tested dynamic seals isolate the sealing liquid in the sealing pressure chamber from the sealing oil in the second sealing chamber, and the tested dynamic ring 22 is close to the dynamic ring end face of the liquid receiving chamber 3 and forms a pair of tested dynamic seals with the tested static ring two in the tested static ring seat No. 2 19. If the tested mechanical seal product is in the sealing oil of the second sealing chamber, the tested dynamic ring 22 is close to the dynamic ring end face of the liquid receiving chamber 3 and forms a pair of tested dynamic seals with the tested static ring two in the tested static ring seat No. 2 19. If the tested dynamic seal at one end of the sealing product leaks, the sealing liquid in the sealing pressure chamber will seep into the second sealing chamber, thereby causing the mixture of sealing liquid and sealing oil to overflow from the oil filling hole on the tail section 5 of the pressure chamber. If the tested dynamic seal at the other end of the tested mechanical sealing product leaks, the sealing oil in the second sealing chamber will seep out and flow into the liquid receiving chamber 3 through the flange cover 4. Therefore, by observing whether there is leakage liquid seeping out of the oil filling hole and the liquid receiving chamber 3 and weighing or volumetrically measuring them, it can be determined whether the tested double-end mechanical seal product is qualified according to the product standard; and for double-end mechanical seal products of different specifications and sizes, it is only necessary to replace the replaceable shaft sleeve 17 and the tested static ring seats 19 and 21 to realize the static pressure operation detection test of each product.

[0041] One end of the core shaft 24 of the double-end mechanical seal static pressure operation test bench described in this embodiment is positioned by cooperating with the transmission main shaft 26 through the central tapered hole, and the other end of the core shaft 24 is supported on the flange cover 4 through the rolling bearing 20. The "simply supported beam" type stable support structure effectively reduces the radial circular runout of the core shaft 24 during high-speed operation and improves the overall operation accuracy of the transmission main shaft 26 and the core shaft 24. Therefore, it has the advantages of high spindle operation accuracy and accurate and reliable test results.

[0042] In this embodiment, a set of accompanying mechanical seal products and a set of tested mechanical seal products are installed on the core shaft 24 in opposite directions, which can effectively offset the axial unbalanced force on the transmission main shaft 26, and the tapered roller bearing 25 supporting the transmission main shaft 26 can withstand a large axial force. Therefore, it has the advantages of small axial unbalanced force, high upper limit of allowable pressure, and can be applied to high-pressure double-end mechanical seal product testing.

[0043] The sealed pressure chamber in this embodiment is connected to the sealing liquid in the high-pressure cooling tank 7 through two pipes, one inlet and one outlet, and a cooling coil is installed in the internal cavity of the high-pressure cooling tank 7, which can effectively cool the sealing liquid based on the thermal siphon principle. The cooling coil is made of copper tube. At the same time, a sealing liquid heating device is also installed on the high-pressure cooling tank 7 to effectively heat the sealing liquid. Therefore, it has the advantages of good circulation temperature control effect and precise control of the sealing liquid temperature.

[0044] The double-end mechanical seal static pressure operation test bench of this embodiment only needs to design and replace the replaceable shaft sleeve 17 and the tested static ring seat No. 2 19 and the tested static ring seat No. 1 21 to realize product detection and testing when testing double-end mechanical seal products of different sizes and specifications, and all pipelines, sensors, etc. connected to the inside of the sealing pressure chamber are installed on the bearing box 8, so that there is no need to repeatedly disassemble and assemble pipelines, sensors and other parts when replacing the tested mechanical seal product. Therefore, it has the advantages of good equipment versatility, a wide range of applicable detection products, convenient operation and maintenance, and can effectively reduce the labor intensity of detection and testing.

[0045] In summary, the double-face mechanical seal static pressure operation test bench and test method of this embodiment have the advantages of small axial unbalanced force, ability to withstand high-pressure test and detection, small spindle radial runout, active and controllable sealing liquid temperature, good versatility, and easy operation. It is very suitable as a standard testing equipment for conducting double-face mechanical seal static pressure operation performance tests, which will effectively improve the technical level of mechanical seal testing equipment, reduce the labor intensity of mechanical seal testing, and promote the standardization of mechanical seal testing equipment in my country.

[0046] Through the above description, those skilled in the art can already implement it.

[0047] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A test method for a double-end mechanical seal static pressure operation test bench, comprising a double-end mechanical seal static pressure operation test bench, the double-end mechanical seal static pressure operation test bench comprising a frame (1), a plate (2), a liquid receiving chamber (3), a flange cover (4), a high-pressure cooling tank (7), a bearing box (8), a driven pulley (13), a transmission belt (14), a driving pulley (15), a motor (16), a replaceable sleeve (17), a rolling bearing (20), a core shaft (24), a transmission main shaft (26) and a pair of tapered roller bearings (25), the plate (2) being mounted on the frame (1), the motor (16) being mounted inside the frame (1), and the bearing box (8) being mounted on the frame (1). On a plate (2), a high-pressure cooling tank (7) is mounted on the plate (2) through a bracket and is higher than a bearing box (8) by a certain distance; a transmission main shaft (26) is mounted in the bearing box (8) through a pair of tapered roller bearings (25); one end of the transmission main shaft (26) is connected to a motor (16) through a driving pulley (15), a driven pulley (13) and a transmission belt (14); the other end of the transmission main shaft (26) is positioned with one end of a core shaft (24) through a central tapered hole and is coaxially fixedly connected with a round nut; the other end of the core shaft (24) is supported on a flange cover (4) through a rolling bearing (20); a replaceable sleeve (17) is coaxially fixedly mounted on the core shaft (24), characterized in that: The double-end mechanical seal static pressure operation test bench also includes a pressure chamber tail section (5), a pressure chamber head section (6), a first static ring seat (21) to be tested, a second static ring seat (19) to be tested, a moving ring (18) to be tested, a moving ring (22) to be tested, and a static ring seat (23) to be tested. The pressure chamber head section (6) is mounted on the bearing box (8) so that the pressure chamber head section (6) remains coaxial with the bearing mounting hole of the bearing box (8). The pressure chamber tail section (5) is mounted on the pressure chamber head section (6) so that the pressure chamber tail section (5) remains coaxial with the pressure chamber head section (6). The flange cover (4) is mounted on the pressure chamber tail section (5) so that the flange cover (4) remains coaxial with the pressure chamber tail section (5). , the liquid receiving chamber (3) is mounted on the flange cover (4) and the liquid receiving chamber (3) is kept coaxial with the flange cover (4); the accompanying static ring seat (23) is coaxially fixed on the bearing box (8), the accompanying static ring seat (23) has an accompanying static ring installed inside, the accompanying dynamic ring (22) is fixed on the core shaft (24) and cooperates with the accompanying static ring to form a pair of dynamic seals; the measured static ring seat No. 1 (21) is coaxially mounted on the first section (6) of the pressure chamber, the measured static ring seat No. 1 (21) has a measured static ring No. 1 installed inside, the measured static ring seat No. 2 (19) is coaxially mounted on the flange cover (4), the measured static ring seat No. 2 (19) has a measured static ring No. 2 installed inside, and the measured dynamic ring (18) is fixed on the replaceable The replaceable shaft sleeve (17) cooperates with the tested static ring No. 1 and the tested static ring No. 2 to form a pair of double-end face dynamic seals; the specific steps of the test method of the double-end face mechanical seal static pressure operation test bench are as follows: the inner wall of the pressure chamber first section (6), the end face of the bearing box (8), the accompanying static ring seat (23), the accompanying mechanical seal product, the tested static ring seat No. 1 (21), and the tested mechanical seal product together constitute a sealed pressure chamber, and the sealed pressure chamber is connected to the inside of the high-pressure cooling tank (7) through two inlet and outlet pipelines installed on the bearing box (8); the inner wall of the pressure chamber tail section (5), the end face of the pressure chamber first section (6), the tested static ring seat No. 1 (21), the flange cover (4), and the tested static ring Seat No. 2 (19) and the tested mechanical seal product together form a second sealing chamber; when working, the sealing liquid is filled into the sealing pressure chamber by controlling the liquid injection valve and the exhaust valve, and the sealing oil is filled into the second sealing chamber through the oil injection hole on the tail section (5) of the pressure chamber and the oil injection hole is kept in an open state, the motor (16) drives the transmission main shaft (26) and the core shaft (24) to rotate, the tested dynamic ring (18) rotates with the core shaft (24) and forms a pair of tested dynamic seals with the tested static ring, during which the pressure of the sealing liquid in the sealing pressure chamber is accurately controlled by controlling the pressurizing valve, and the temperature of the sealing liquid in the pressure chamber is accurately controlled by controlling the sealing liquid heating device and the cooling water of the cooling coil;The mechanical seal product to be tested is in the sealing oil of the second sealing chamber, the dynamic ring end face of the dynamic ring (18) to be tested close to the sealing pressure chamber forms a pair of dynamic seals to be tested one with the static ring one to be tested in the static ring seat number one (21) to be tested, the dynamic seal one to be tested isolates the sealing liquid in the sealing pressure chamber from the sealing oil in the second sealing chamber, the dynamic ring end face of the dynamic ring (18) to be tested close to the liquid receiving chamber (3) forms a pair of dynamic seals to be tested two with the static ring two to be tested in the static ring seat number two (19) to be tested; if the dynamic seal one to be tested at one end of the mechanical seal product to be tested leaks, the sealing liquid in the sealing pressure chamber will seep into the second sealing chamber, thereby causing the sealing liquid and the sealing oil to mix. The combined liquid overflows from the oil filling hole on the tail section (5) of the pressure chamber. If the second dynamic seal under test at the other end of the tested mechanical seal product leaks, the sealing oil in the second sealing chamber will seep out and flow into the liquid receiving chamber (3) through the flange cover (4). Therefore, by observing whether there is leakage from the oil filling hole and the liquid receiving chamber (3) and weighing or volume measuring the leakage, it can be determined whether the tested mechanical seal product is qualified according to the product standard; and for double-end mechanical seal products of different specifications and sizes, it is only necessary to replace the replaceable shaft sleeve (17) and the tested static ring seat No. 2 (19) and the tested static ring seat No. 1 (21) to realize the static pressure operation test of each product. ; 2. The test method of the double-end mechanical seal static pressure operation test bench according to claim 1 is characterized in that: The bearing box (8) is provided with a bearing mounting hole for mounting a supporting 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 connected to the first section (6) of the pressure chamber. The bearing box (8) is also provided with two pipeline interfaces which are directly connected to the first section (6) of the pressure chamber and are respectively connected to the high-pressure cooling tank (7) through two pipelines, one inlet and one outlet.

3. The test method of the double-end mechanical seal static pressure operation test bench according to claim 1 is characterized in that: The high-pressure cooling tank (7) is connected to the sealing liquid in the first section (6) of the pressure chamber via two pipelines, one for inlet and one for outlet, and a cooling coil for effectively cooling the sealing liquid and a sealing liquid heating device for effectively heating the sealing liquid are installed in the internal cavity of the high-pressure cooling tank (7). The high-pressure cooling tank (7) is also equipped with an exhaust valve, a liquid injection valve, a pressurizing valve, and a liquid discharge valve that are connected to the internal cavity of the tank body.

4. The test method of the double-end mechanical seal static pressure operation test bench according to claim 1 is characterized by: The double-end mechanical seal static pressure operation test bench also includes a rotation speed sensor (10) for measuring the rotation speed of the transmission main shaft (26); the rotation speed sensor (10) is mounted on the flat plate (2).

5. The test method of the double-end mechanical seal static pressure operation test bench according to claim 1 is characterized by: The double-end mechanical seal static pressure operation test bench also includes a pressure sensor (11) for measuring the pressure of the sealing liquid in the first section (6) of the pressure chamber, and the pressure sensor (11) is installed on the bearing box (8).

6. The test method of the double-end mechanical seal static pressure operation test bench according to claim 1 is characterized by: The double-end mechanical seal static pressure operation test bench also includes a temperature sensor (12) for measuring the temperature of the sealing liquid in the first section (6) of the pressure chamber, and the temperature sensor (12) is installed on the bearing box (8).

7. The test method of the double-end mechanical seal static pressure operation test bench according to claim 1 is characterized by: The tail section (5) of the pressure chamber is provided with an oil filling hole at the top and an oil drain hole at the bottom.

8. The test method of the double-end mechanical seal static pressure operation test bench according to claim 1 is characterized by: A bearing mounting through hole is machined at the center of the flange cover (4).

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