Testing system based on valve reliability test

Abstract

The invention belongs to the technical field of valve reliability tests, and particularly relates to a test system based on a valve reliability test. The device comprises a flange clamp, a driving head and a pressure loading assembly, wherein the flange clamp comprises a flange seat and a flange ring mounted on the flange seat; the three flange rings are coaxially connected in a sleeved mode and are in rotation fit with one another. Matching grooves are formed in the matching faces of every two adjacent flange rings in the radial direction in a concave mode, and therefore the matching grooves can be folded to form assembling holes used for fixing valve flanges by means of relative rotation of the two adjacent flange rings. In the three flange rings, when the matching grooves in the positions of two matched flange rings are combined to form the assembly hole, the matching grooves in the positions of the other two matched flange rings are staggered. According to the invention, the reliability of the valve can be tested under the hot working condition and the cold working condition.

Description

[0001] This invention is a divisional application of the application with the application number CN202210637807.0 and the application name "Test System, Test Device and Test System Based on Valve Reliability Test". The filing date of the original application is June 7, 2022. Technical Field

[0002] This invention belongs to the technical field of valve reliability tests, and particularly relates to a test system based on valve reliability tests. Background Art

[0003] Valve reliability tests are used to assess the overall performance of valves; through tests, the reliability times of valves can be obtained, the opening and closing torques of valves can be measured, and the dynamic torque during the opening and closing process can be measured. The damage conditions of various sealing components, valve stems, and valve stem nuts can be inspected. Existing valve reliability test devices are improved based on the prototype of valve housing strength testing machines and are divided into two types: hydraulic top-pressing type and hydraulic clamping type to respectively target different types and different connection forms of valves. The valve structure types applicable to the above-mentioned traditional valve reliability test devices are single, and the range of valve size specifications is relatively narrow. Limited by the hydraulic installation method, valve reliability tests under hot conditions cannot be carried out. In addition, when a traditional single-range torque sensor is used for small torque tests, the test error is much larger than the instrument calibration error, resulting in the test results having no reference value; although a dual-range torque sensor can switch the test range to a small range gear when the motor test system conducts small torque tests to ensure accurate measurement accuracy, the current domestic dual-range torque sensor technology maturity is not high and the cost is high. Therefore, it is urgent to solve. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned deficiencies of the prior art and provide a test system based on valve reliability tests, which can realize the fixed requirements of valves with multiple specifications and sizes with one machine, so as to effectively expand the application breadth of a single valve reliability test device; and through cooperation with the test device, the valve reliability tests under hot and cold conditions can be realized.

[0005] To achieve the above purpose, this invention adopts the following technical solutions:

[0006] A test system based on valve reliability tests, characterized in that: it includes two groups of flange clamps; directly above the two groups of flange clamps, there is a driving head for twisting the valve handle between the two groups of flange clamps. A card slot for clamping the valve handle is recessed at the bottom end of the driving head; the test device also includes a servo motor, and the output end of the servo motor is communicatively connected to the first reducer and the second reducer through a coupling. The second reducer is a two-speed reducer, and there are differences in the reduction ratios of the first reducer and the second reducer; the top end of the driving head is selectively connected to the output end of one of the reducers, so as to realize the rotation action by relying on the servo motor; an angle encoder and a torque sensor are arranged at the driving head.

[0007] The flange clamp includes a flange seat and a flange ring installed on the flange seat; the flange rings are three coaxially sleeved and rotatably mated with each other; at the mating surfaces of adjacent two flange rings, mating grooves are radially recessed, so that the mating grooves can be aligned to form an assembly hole for fixing the valve flange by the relative rotation of the adjacent two flange rings; among the three flange rings, when the mating grooves at two mutually mating flange rings form the assembly hole, the mating grooves at the other two mutually mating flange rings are staggered from each other.

[0008] It includes a pressure loading component; at the axis of the flange clamp, there is a medium interface for communicating the inlet and outlet of the pressure loading component. A seal is provided at the medium interface so that the valve cavity forms a sealed cavity. The medium passes through the valve cavity, the medium interface at the first group of flange clamps, the first pressure sensor P1, the first temperature sensor T1, the sixth switching valve V6, the seventh switching valve V7, the water tank, the first switching valve V1, the water pump, the check valve, the second switching valve V2, the pressurizing container, the fifth switching valve V5, the second pressure sensor P2 and the second temperature sensor T2 and then enters the medium interface at the second group of flange clamps; both ends of the booster pump are communicatively connected to the water tank and the inlet end of the second switching valve V2 respectively; the test system also includes a cold test pipeline and a hot test pipeline; one end of the hot test pipeline is communicatively connected to the outlet of the pressurizing container, so that the medium can sequentially pass through the third switching valve V3, the preheating container and the fourth switching valve V4 and then be communicatively connected to the outlet end of the fifth switching valve V5; one end of the cold test pipeline is communicatively connected to the outlet end of the sixth switching valve V6, so that the medium can sequentially pass through the eighth switching valve V8, the cooling module and the ninth switching valve V9 and then be communicatively connected to the water tank.

[0009] Preferably, the flange rings include an inner flange ring, a middle flange ring and an outer flange ring arranged in sequence from inside to outside in the radial direction; the mating grooves are U-shaped grooves and are correspondingly located on the outer ring surface of the inner flange ring, the inner ring surface of the middle flange ring, the outer ring surface of the middle flange ring and the inner ring surface of the outer flange ring, so that the assembled hole formed by combination has a waist-shaped hole shape with the hole length extending along the radial direction of the flange ring.

[0010] Preferably, a semi-circular groove is recessed in the top surface of the flange seat, and a pressing arm in the shape of a semi-circular arc rod is hinged at one side notch of the semi-circular groove; when the cantilever end of the pressing arm is fixed at the other side notch of the semi-circular groove, the pressing arm and the semi-circular groove jointly form a positioning hole for coaxially pressing and fixing the outer flange ring. The inner flange ring, the middle flange ring and the outer flange ring are all split structures in half, and their split surfaces coincide with the axis of the positioning hole; a turntable is rotatably fitted at the inner ring surface of the inner flange ring, and mating grooves for forming assembly holes are also arranged at the outer edge of the turntable and the outer ring surface of the inner flange ring.

[0011] Preferably, annular ridges and annular grooves are correspondingly arranged between the positioning hole and the outer flange ring, between the three flange rings, and between the inner flange ring and the turntable, so that the mating surfaces of all components can form a guide rail mating relationship through the clamping of the annular ridges and annular grooves.

[0012] Preferably, radially from the inside to the outside, the number of assembly holes formed by the mating grooves uniformly distributed at the outer edge of the turntable and the outer ring surfaces of each flange ring are 4, 8, and 12 respectively; in the circumferential direction of the middle flange ring, the first mating groove, the fourth mating groove, the eighth mating groove, and the twelfth mating groove on the outer ring surface of the middle flange ring all penetrate through the ring body of the middle flange ring, so as to communicate with the first mating groove, the third mating groove, the fifth mating groove, and the seventh mating groove at the inner ring surface, thereby cross-splitting the middle flange ring into a four-equal structure.

[0013] Preferably, the flange seat includes a base and a vertical plate vertically arranged on the base, and the semi-circular groove is provided at the top end of the vertical plate; the vertical plate is hinged to the top surface of the base through a horizontally hinged seat with an adjustable hinge angle, and the axis of the horizontally hinged seat is parallel to the axis of the positioning hole.

[0014] Preferably, a support plate is installed in a fitting manner on the inner side plate surface of the vertical plate, and the top surface of the support plate constitutes a support surface for supporting the flange outer edge of the valve from bottom to top.

[0015] Preferably, both groups of flange clamps are slidably assembled on the workbench surface through horizontal translation tracks, so that the two groups of flange clamps can perform coaxial approaching and separating actions along the horizontal translation tracks; the horizontal translation track is a T-shaped slide, and a slider is provided at the flange seat to form a guide rail sliding fit relationship with the horizontal chute at the horizontal translation track; the horizontal translation track is slidably fitted on the longitudinal sliding guide rail, so that the horizontal translation track and the longitudinal sliding guide rail jointly form a cross-adjustment slide rail system.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1) Abandoned the traditional single-to-single installation and fixation structure where a single flange clamp can only match a single valve. Instead, a rotatable flange ring system was adopted. By using the assembly holes formed by the natural alignment of the mating grooves at adjacent two flange rings, a multi-turn variable assembly hole structure was actually formed from the inside out. Each turn of the assembly holes can match valves of corresponding specifications, thus realizing the fixation requirements for valves of multiple specifications with a single machine, and ultimately effectively expanding the usage breadth of a single valve reliability test device.

[0018] More notably, on the one hand, since each flange ring can rotate relative to each other at any angle and can be adjusted at any angle, assembly holes can be assembled to fit valves of different standard systems such as American Standard, National Standard, and Ship Standard. On the other hand, due to the rotatability of each flange ring, when one turn of the assembly holes is formed, the mating grooves of other turns will be in a misaligned state where assembly holes cannot be formed, thus greatly ensuring the structural strength and working stability of the entire flange assembly surface.

[0019] Thus far, the present invention can be compatible with the installation of multiple types of valves at the same time. Through the rotation of each flange ring, it can also be maximally compatible with the installation of valves of different standards, different calibers, and pressure grades. Even after the valve is installed at any angle, by utilizing the rotation characteristics of the flange ring, the handwheel can ultimately be perpendicular to the center of the flow channel and vertically upward, so as to ensure the authenticity, accuracy, and reliability of the measured operating torque, with remarkable results.

[0020] 2) During actual design, the flange ring is at least three layers, that is, including an inner flange ring, a middle flange ring, and an outer flange ring, so as to meet the forming requirements of at least two turns of assembly holes. Considering that even for the same layer of assembly holes, valves of different specifications may be installed within a certain margin, the finally formed assembly holes should be waist-shaped holes to reserve sufficient margin to achieve adaptable assembly requirements.

[0021] 3) Further, when each flange ring rotates relative to each other, how to ensure that adjacent flange rings are both connected to each other and not easily separated is a factor that needs to be considered. During actual design, the present invention preferably adopts the mutual clamping of grooves and ridges, thus realizing the axial limit and circumferential guiding functions of adjacent flange rings to ensure the reliability of equipment use.

[0022] 4) During actual assembly, the flange rings can be integrally assembled directly through methods such as heat expansion of bearings; or as described in the present invention, split flange rings can be used, combined with a flange seat with a detachable pressing arm, thus achieving the purpose of sequentially placing and assembling each flange ring, so as to improve the convenience and flexibility in operation.

[0023] 5) The middle flange ring is connected with the corresponding assembly holes to form a four-part structure. This four-part structure not only makes the middle flange ring naturally form a split structure for quick disassembly and assembly, but also solves the problem that too many independent matching grooves cannot be placed in the middle flange ring due to the distribution of 4, 8, and 12 standard flanges under limited volume, and ensures the compactness of the overall volume, achieving multiple goals at one stroke.

[0024] 6) In actual design, the horizontal hinged seat realizes the angle adjustment function of the plumb plate to improve the convenience of valve installation; the support plate can play a good role in positioning the valve or supporting the valve whether it is during valve installation or testing.

[0025] 7) The present invention can realize automatic switching between servo motors and different reducers through couplings such as electromagnetic couplings, etc., which solves the problem that the existing single-range torque sensor has large measurement errors under small torques, and the dual-range torque sensor technology is not mature and expensive. If necessary, even the same reducer itself can adopt a dual-speed operation mode, thereby further expanding its application.

[0026] 8) The present invention is also provided with a preheating container, an electric heating system and a separate cold test pipeline. Together with the aforementioned test device, the valve reliability test under hot and cold conditions can be realized, and the practicality can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the flange clamp;

[0028] Figure 2 for Figure 1 Exploded diagram of the structure;

[0029] Figure 3 and Figure 4 This is the usage status diagram of the flange ring;

[0030] Figure 5 A schematic diagram of the three-dimensional structure of one embodiment of the test device;

[0031] Figure 6 for Figure 5 The assembly position diagram of the two sets of flange clamps in FIG.

[0032] Figure 7 This is the piping layout diagram of the test system.

[0033] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0034] a-valve

[0035] 10-flange seat 11-semicircular groove 12-pressure arm

[0036] 13 - Base 14 - Plumb board 15 - Horizontal hinge seat 16 - Support plate

[0037] 21 - Outer flange ring 22 - Middle flange ring 23 - Inner flange ring 24 - Fitting groove

[0038] 25 - Turntable 26 - Medium interface

[0039] 31 - Annular convex rib 32 - Annular groove 40 - Driving head 50 - Servo motor

[0040] 61 - Horizontal translation track 61a - Horizontal chute 62 - Longitudinal sliding guide rail

[0041] 71 - Water tank 72 - Water pump 73 - Pressure - increasing container 74 - Pressure - increasing pump

[0042] 75 - Pre - heating container 76 - Cooling module Detailed implementation mode

[0043] For ease of understanding, in combination with Figures 1-7 , the specific structure and working mode of the present invention are further described as follows:

[0044] The specific structure of the present invention is as shown in Figures 1-7 . Its main structure includes a flange clamp, a workbench surface for installing the flange clamp, a cross - adjustment slide rail system located on the workbench surface, a valve drive control component located above the flange clamp, and a corresponding pressure loading control component, etc. Among them:

[0045] The structure of the flange clamp refers to Figures 1-4 and Figure 6 . It includes a flange seat 10 and three layers of flange rings assembled on the flange seat 10. Of course, in actual design, the number of flange rings can be appropriately increased or decreased. Taking three layers as the optimal, it can adapt to valves a of different specifications and sizes to the greatest extent.

[0046] In Figures 1-4As can be seen, the flange ring forms an inner flange ring 23, a middle flange ring 22, and an outer flange ring 21 from the inside out. To ensure the rotary movement of the flange ring, annular ridges 31 and annular grooves 32 are correspondingly arranged between the inner ring surface of the outer flange ring 21, the inner and outer ring surfaces of the middle flange ring 22, and the outer ring surface of the inner flange ring 23. Thus, through the guide rail cooperation between the annular ridges 31 and the annular grooves 32, the axial offset of the three-layer flange ring is restricted, and the relative rotary function of each flange ring is ensured. Sixteen U-shaped mating grooves 24 are provided at the inner ring surface of the outer flange ring 21. To ensure the strength of the flange ring, these mating grooves 24 are not evenly distributed across the center line but are arranged at a 7.5-degree counterclockwise rotation from the center line to reasonably distribute the 16 grooves. Sixteen mating grooves 24 are provided at the outer ring surface of the middle flange ring 22 to match the corresponding grooves at the outer flange ring 21, forming 16 waist-shaped assembly holes in the outer layer. Eight mating grooves 24 are arranged at the inner ring surface of the middle flange ring 22 to match the eight mating grooves 24 provided at the outer ring surface of the inner flange ring 23, forming eight waist-shaped assembly holes in the middle layer. In Figures 3-4 Inside, a turntable 25 is also coaxially inserted through the inner flange ring 23. A medium interface 26 is arranged at the center of the turntable 25. Four mating grooves 24 are recessed at the outer edge of the turntable 25, thus matching with the four mating grooves 24 at the inner flange ring 23 to form four waist-shaped assembly holes in the inner layer. Considering that the middle flange ring 22 has the function of connecting the upper and lower parts and has too many mating grooves 24, two of the axially symmetrically arranged mating grooves 24 can be designed in the form of through grooves to achieve the optimization of the layout.

[0047] During operation, the turntable 25 can rotate and fit on the inner ring surface of the inner flange ring 23 or form an integral structure with the inner flange ring 23. When it is necessary to fix the valve a, the two ends of the valve a can be clamped by the cooperation of two groups of flange clamps. At the same time, by reasonably adjusting the position of the flange ring at the flange clamp, the function of bolt-fixing the flange surfaces at both ends of the valve a can be achieved. When it is necessary to conduct a reliability test under the simulated medium working environment, a threaded interface-shaped medium interface 26 can be considered to be arranged at the center of the outer end face of the turntable 25 and connected to the test pipeline. The center of the inner end face can be sealed by a sealing groove and a sealing blind plate.

[0048] Since the three-layer flange rings at the flange clamp can rotate at any angle relative to each other, and even the turntable 25 and the inner flange ring 23 can be adjusted at any angle, it can effectively adapt to the installation of valves in different standard systems such as American Standard, National Standard, and Ship Standard.

[0049] In actual use, as Figures 3-4 shown, the respective flange rings need to be assembled on the flange seat 10. The outer shape of the flange seat 10 refers to Figures 1-2As shown, it includes a base 13 and a plumb plate 14 vertically arranged on the base 13. A semi-circular groove 11 is recessed at the top of the plumb plate 14, and the combined effect is achieved by a semi-circular arc rod-shaped pressing arm 12 hinged at one side notch of the semi-circular groove 11. In the combined state, positioning holes as shown in Figure 2 are formed on the plumb plate 14 for installing each flange ring. The outer flange ring 21 and the positioning hole can also be ensured to have a rotational state through the cooperation of the annular convex rib 31 and the annular groove 32 as shown in Figure 2 . To ensure the convenient disassembly and assembly of the flange ring, the outer flange ring 21 and the inner flange ring 23 can both be arranged as a split structure; of course, since the middle flange ring 22 is a quartered body itself, it naturally forms a split structure.

[0050] As shown in Figure 1 and Figure 6 , the base 13 and the plumb plate 14 are hinged to each other through a horizontal hinge seat 15, and the angle adjustment of the plumb plate 14 from 0° to 90° can be realized; even the horizontal hinge seat 15 itself can be designed as a vertically adjustable height mechanism through methods such as adjustment by kidney-shaped holes to realize the adjustment function of the height of the positioning hole; of course, this function can also be realized by adding gaskets and other means. At the same time, a support plate 16 is arranged on the inner side of the plumb plate 14 facing the other set of flange clamps. The support plate 16 realizes the adjustable function of the vertical height through the cooperation of kidney-shaped holes to achieve the adjustment effect of the valve center height. Through the above adjustments, the present invention can be adapted to the installation of straight-through valves, angle valves, and non-standard valves with inconsistent centerlines of flange inlets and outlets.

[0051] As can be seen from Figure 6 , a cross-adjustment slide rail system is arranged between the base 13 and the working platform, that is, it includes a horizontal transverse movement track 61 and a longitudinal sliding guide rail 62. For the horizontal transverse movement track 61, on the one hand, the present invention relies on a guide block 12 with rollers to be slidably assembled on the horizontal transverse movement track 61; on the other hand, it utilizes the inherent characteristics of the horizontal transverse movement track 61 as a T-slot workbench, and realizes the conventional fastening between the base 13 and the horizontal transverse movement track 61 through the cooperation of bolts and nuts. Considering that the roller size is larger than the notch of the T-slot-shaped horizontal chute 61a, it can be as shown in Figure 6A through hole is partially arranged in the horizontal chute 61a as shown to facilitate the assembly of the guide block 12. Of course, the guide block 12 can also be directly inserted into the horizontal traversing track 61 from the end, and the assembly method will not be elaborated here. Considering the displacement sensitivity of the flange clamp, a sliding pad can also be arranged at the bottom surface of the base 13 of the flange clamp to ensure a sliding fit relationship with the top surface or the upper surface of the horizontal traversing track 61. At the same time, a longitudinal sliding guide rail 62 can be arranged below the horizontal traversing track 61. It can be considered to rely on a longitudinal motor and a threaded lead screw to achieve the reciprocating pushing effect on the horizontal traversing track 61. Of course, a linear stroke drive source such as a piston cylinder can also be matched to cooperate to achieve the purpose of double-axis sliding of the XY axis for the valve a.

[0052] Based on the above structure, two sets of valve drive control components can be arranged on the workbench of the present invention. One set of valve drive control components is used for manual valve drive, and the other set can be used for active valve drive.

[0053] The active valve drive is relatively simple. During actual design, an electric actuator, a pneumatic actuator, an electro-hydraulic actuator, etc. can be added as appropriate to achieve functions such as power supply with different parameters, adjustment feedback analog output, and providing different air pressures, so as to achieve the pneumatic, electric, and hydraulic drive effects of the active valve. This part is relatively conventional and will not be elaborated here.

[0054] As Figure 5 shown, the valve drive control component of the manual valve drive part is composed of a servo motor 50, a first reducer, a two-speed reducer (i.e., the second reducer), a coupling, a torque sensor, an angle encoder, etc. to achieve the accurate measurement of the full-range torque range within a large range of "0 - 1T - 10T - 100T" of the device. The servo motor 50 can be switched and connected to the first reducer and the two-speed reducer through an electromagnetic coupling. When a large torque in the range of "10T - 100T" of the device range needs to be accurately output at the drive head 40 for testing, the servo motor 50 is connected to the first reducer through the electromagnetic coupling. When the drive head 40 needs to accurately output the conventional torque in the range of "1T - 10T" of the device range for measurement, the servo motor 50 is connected to the two-speed reducer through the electromagnetic coupling. At this time, the input shaft inside the two-speed reducer is connected to the planetary gear and the output shaft of the drive head 40. Even when the valve to be measured requires the drive head 40 to accurately output a small torque in the range of "0 - 1T" within the range, the servo motor 50 is connected to the two-speed reducer through the electromagnetic coupling. The internal switching system of the two-speed reducer disconnects the input shaft from the gear and directly connects it to the output shaft of the drive head 40 to achieve two-speed switching. At this time, the reduction ratio is 1. Of course, the structures and operating methods of the two-speed reducer and the first reducer are all conventional technologies, so their working principles will not be elaborated.

[0055] Furthermore, the present invention also provides asFigure 7 The pressure loading component shown includes a water tank 71, a booster pump 74, a water pump 72, a pressure boosting container 73, a preheating container 75, a cooling module 76, and corresponding pressure sensors and temperature sensors, etc. During operation, the medium passes through the valve cavity of valve a, the medium interface 26 at the first group of flange clamps, the first pressure sensor P1, the first temperature sensor T1, the sixth switching valve V6, the seventh switching valve V7, the water tank 71, the first switching valve V1, the water pump 72, the check valve, the second switching valve V2, the pressure boosting container 73, the fifth switching valve V5, the second pressure sensor P2, and the second temperature sensor T2, and then enters the medium interface 26 at the second group of flange clamps; both ends of the booster pump 74 are respectively connected to the water tank 71 and the inlet end of the second switching valve V2; the test system also includes a cold test pipeline and a hot test pipeline; one end of the hot test pipeline is connected to the outlet of the pressure boosting container 73, so that the medium can sequentially pass through the third switching valve V3, the preheating container 75, and the fourth switching valve V4 and then be connected to the outlet end of the fifth switching valve V5; one end of the cold test pipeline is connected to the outlet end of the sixth switching valve V6, so that the medium can sequentially pass through the eighth switching valve V8, the cooling module 76, and the ninth switching valve V9 and then be connected to the water tank 71.

[0056] During actual testing, the above pressure loading component can cooperate with the aforementioned test device to perform valve reliability tests under cold and hot conditions, specifically as follows:

[0057] Cold state reliability test process:

[0058] 1. Before the test starts, the valve under test is in the closed state. After the test starts, the first valve V1 and the second valve V2 are opened in sequence, and the water in the water tank 71 is transported to the pressure boosting container 73 through the water pump 72, and the booster pump 74 is started for boosting. After the pressure in the pressure boosting container 73 rises to the test pressure P, the fifth valve V5 is opened. At this time, the pressure in front of the valve under test is P, and the pressure behind the valve is 0, and it is in the closed state under the full pressure difference.

[0059] 2. The valve under test is opened, the fifth valve V5 is closed, the sixth valve V6 and the seventh valve V7 are opened, and the valve under test is depressurized, and the medium circulates back to the water tank 71. Immediately afterwards, the sixth valve V6 and the seventh valve V7 are closed, and the valve under test remains in the open state; the fifth valve V5 is opened, and when the pressure in the valve cavity rises to 60%P of the test pressure, the valve under test starts to close.

[0060] 3. After the valve under test is closed, one test cycle is completed, and then the operations in steps 1 and 2 are continued and repeated in sequence until the test times are reached and the test ends.

[0061] Hot state reliability test process:

[0062] a. Before the test starts, the valve under test is in the closed state. After the test starts, the first valve V1 and the second valve V2 are opened in sequence, and the water in the water tank 71 is conveyed to the pressurization container 73 through the water pump 72. The pressurization pump 74 is started for pressurization until the pressure in the pressurization container 73 rises to the test pressure P. The fifth valve V5 remains closed all the time, and the third valve V3 is opened. The medium enters the preheating container 75, and the electric heating is turned on. After reaching the test pressure P and the test temperature T, the fourth valve V4 is opened. At this time, the pressure in front of the valve under test is P, and the pressure behind the valve is 0, and it is in the closed state under the full pressure difference.

[0063] b. The valve under test is opened, the fourth valve V4 is closed, the sixth valve V6, the eighth valve V8, and the ninth valve V9 are opened, and the seventh valve V7 remains closed all the time. The valve under test is depressurized, and the medium circulates back to the water tank 71 through the cooling module 76. Immediately afterwards, the sixth valve V6, the eighth valve V8, and the ninth valve V9 are closed, and the valve under test remains in the open state; the fourth valve V4 is opened. When the pressure in the valve cavity rises to 60%P of the test pressure and the test temperature T is maintained, the valve under test starts to close.

[0064] c. After the valve under test is closed, a test cycle is completed, and then the operations in steps a and b are continued and repeated in sequence until the test is ended after reaching the number of tests.

[0065] Of course, for those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0066] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0067] The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A test system for valve reliability tests, characterized in that: It includes two sets of flange clamps; a driving head (40) for twisting the valve handle between the two sets of flange clamps is arranged directly above the two sets of flange clamps. A card slot for engaging the valve handle is recessed at the bottom end of the driving head (40); this test device also includes a servo motor (50). The output end of the servo motor (50) is selectively connected to a first reduction gear and a second reduction gear through a coupling. The second reduction gear is a two-speed reduction gear, and there are differences in the reduction ratios of the first reduction gear and the second reduction gear; the top end of the driving head (40) is selectively connected to the output end of one of the reduction gears, so as to realize the rotation action by relying on the servo motor (50); an angle encoder and a torque sensor are arranged at the driving head (40). The flange clamp includes a flange seat (10) and a flange ring installed on the flange seat (10); the flange rings are three coaxially sleeved and forming a rotary fit with each other; at the mating surface of adjacent two flange rings, mating grooves (24) are radially recessed, so that an assembly hole for fixing the valve flange can be formed by the alignment of the mating grooves (24) due to the relative rotation of the adjacent two flange rings; among the three flange rings, when the mating grooves (24) at two mutually mating flange rings form the assembly hole, the mating grooves (24) at the other two mutually mating flange rings are staggered from each other. It includes a pressure loading component; a medium interface (26) for connecting the inlet and outlet of the pressure loading component is arranged at the axis of the flange clamp. A seal is arranged at the medium interface (26) so that the valve cavity forms a sealed cavity. The medium passes through the valve cavity, the medium interface (26) at the first group of flange clamps, the first pressure sensor P1, the first temperature sensor T1, the sixth switching valve V6, the seventh switching valve V7, the water tank (71), the first switching valve V1, the water pump (72), the check valve, the second switching valve V2, the pressurizing container (73), the fifth switching valve V5, the second pressure sensor P2 and the second temperature sensor T2 and then enters the medium interface (26) at the second group of flange clamps; both ends of the booster pump (74) are respectively connected to the water tank (71) and the inlet end of the second switching valve V2; this test system also includes a cold test pipeline and a hot test pipeline; one end of the hot test pipeline is connected to the outlet of the pressurizing container (73), so that the medium can sequentially pass through the third switching valve V3, the preheating container (75) and the fourth switching valve V4 and then be connected to the outlet end of the fifth switching valve V5; one end of the cold test pipeline is connected to the outlet end of the sixth switching valve V6, so that the medium can sequentially pass through the eighth switching valve V8, the cooling module (76), the ninth switching valve V9 and then be connected to the water tank (71).

2. The test system for valve reliability tests according to claim 1, characterized in that: The flange ring includes an inner flange ring (23), a middle flange ring (22) and an outer flange ring (21) arranged in sequence from inside to outside in the radial direction; the mating groove (24) is in the shape of a U-shaped groove and is correspondingly located on the outer ring surface of the inner flange ring (23), the inner ring surface of the middle flange ring (22), the outer ring surface of the middle flange ring (22) and the inner ring surface of the outer flange ring (21), so that the shape of the assembled hole formed by combination is in the shape of a kidney-shaped hole with the hole length extending along the radial direction of the flange ring.

3. The test system for valve reliability tests according to claim 2, characterized in that: The top surface of the flange seat (10) is recessed with a semi-circular groove (11), and a pressing arm (12) in the shape of a semi-circular arc rod is hinged at one side notch of the semi-circular groove (11); when the cantilever end of the pressing arm (12) is fixed at the other side notch of the semi-circular groove (11), the pressing arm (12) and the semi-circular groove (11) jointly form a positioning hole for coaxially pressing and fixing the outer flange ring (21). The inner flange ring (23), the middle flange ring (22) and the outer flange ring (21) are all split structures in half, and their split surfaces coincide with the axis of the positioning hole; a turntable (25) is rotatably fitted on the inner ring surface of the inner flange ring (23), and fitting grooves (24) for forming assembly holes are also arranged at the outer edge of the turntable (25) and the outer ring surface of the inner flange ring (23).

4. The test system for valve reliability tests according to claim 3, characterized in that: Annular ridges (31) and annular grooves (32) are correspondingly arranged between the positioning hole and the outer flange ring (21), between the three flange rings, and between the inner flange ring (23) and the turntable (25), so that the mating surfaces of each component can form a guide rail mating relationship through the clamping of the annular ridges (31) and the annular grooves (32).

5. The test system for valve reliability tests according to claim 2 or 3 or 4, characterized in that: Radially from the inside to the outside, the number of assembly holes formed by the combined fitting grooves (24) evenly distributed on the outer edge of the turntable (25) and the outer ring surfaces of each flange ring are 4, 8, and 12 respectively; in the circumferential direction of the middle flange ring (22), the first fitting groove, the fourth fitting groove, the eighth fitting groove, and the twelfth fitting groove on the outer ring surface of the middle flange ring (22) all penetrate through the ring body of the middle flange ring (22), so as to communicate with the first fitting groove, the third fitting groove, the fifth fitting groove, and the seventh fitting groove on the inner ring surface, thereby cross-splitting the middle flange ring (22) into a four-equal structure.

6. The test system for valve reliability tests according to claim 3 or 4, characterized in that: The flange seat (10) includes a base (13) and a vertical plate (14) vertically arranged on the base (13), and the semi-circular groove (11) is arranged at the top end of the vertical plate (14); the vertical plate (14) is hinged to the top surface of the base (13) through a horizontally hinged seat (15) with an adjustable hinge angle, and the axis of the horizontally hinged seat (15) is parallel to the axis of the positioning hole.

7. The test system for valve reliability tests according to claim 6, characterized in that: A support plate (16) is installed in a fitting manner on the inner side plate surface of the vertical plate (14), and the top surface of the support plate (16) constitutes a support surface for supporting the flange outer edge of the valve from bottom to top.

8. The test system for valve reliability tests according to claim 1, characterized in that: Both groups of flange clamps are slidably assembled on the workbench surface through a horizontal transverse movement track (61), so that the two groups of flange clamps can perform coaxial approaching and separating actions along the horizontal transverse movement track (61); the horizontal transverse movement track (61) is a T-shaped slide table, and a slider is arranged at the flange seat (10) to form a guide rail sliding fit relationship with the horizontal chute (61a) at the horizontal transverse movement track (61); the horizontal transverse movement track (61) is slidably fitted on the longitudinal sliding guide rail (62), so that the horizontal transverse movement track (61) and the longitudinal sliding guide rail (62) jointly form a cross-adjustable slide rail system.

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