Flange clamp, test device and test system based on valve reliability test

Abstract

The present invention belongs to the technical field of valve reliability test, and specifically relates to a flange clamp, a test device and a test system based on valve reliability test. The present invention includes a flange seat and a flange ring installed on the flange seat; the flange rings are three coaxial sleeves and form a rotation fit with each other; the mating surfaces of two adjacent flange rings are radially recessed with mating grooves, so that the mating grooves can be matched to form an assembly hole for fixing the valve flange by relying on the relative rotation of the two adjacent flange rings; among the three flange rings, when the mating grooves of two of the mating flange rings are combined to form the assembly hole, the mating grooves of the other two mating flange rings are staggered. The present invention can realize the fixing requirements of valves of multiple specifications and sizes with one machine for multiple uses, thereby effectively expanding the breadth of use of a single valve reliability test device.

Description

Technical Field

[0001] The invention belongs to the technical field of valve reliability test, and in particular relates to a flange clamp, a test device and a test system based on valve reliability test. Background Art

[0002] The valve reliability test is used to assess the overall performance of the valve. Through the test, the reliability times of the valve can be obtained, the opening and closing torque of the valve and the dynamic torque during the opening and closing process can be measured, and the damage of each sealing component, valve stem and valve stem nut can be checked. The existing valve reliability test device is improved on the basis of the prototype of the valve housing strength tester, and is divided into two types: hydraulic top pressure type and hydraulic holding pressure type, so as to target valves of different types and different connection forms respectively. The above-mentioned traditional valve reliability test device is applicable to a single type of valve structure and a narrow range of valve size specifications. Due to the limitation of the hydraulic installation method, the valve reliability test under hot working conditions cannot be performed. In addition, since the test error of the traditional single-range torque sensor is much larger than the instrument calibration error when performing a small torque test, the test result has no reference value; and although the dual-range torque sensor can switch the test range to the small range gear when the motor test system performs a small torque test to ensure accurate measurement accuracy, the existing domestic dual-range torque sensor technology is not mature and the cost is high. Therefore, it is urgent to solve. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a flange clamp based on valve reliability testing, which can be used for multiple purposes to meet the fixing requirements of valves of various specifications and sizes, thereby effectively expanding the use of a single valve reliability testing device.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A flange clamp based on valve reliability test, characterized in that it includes a flange seat and a flange ring installed on the flange seat; the flange rings are three coaxially sleeved and rotatably matched with each other; matching grooves are radially recessed at the matching surfaces of two adjacent flange rings, so that the matching grooves can be matched to form an assembly hole for fixing the valve flange by relying on the relative rotation of the two adjacent flange rings; among the three flange rings, when the matching grooves at two of the matching flange rings are combined to form the assembly hole, the matching grooves at the other two matching flange rings are staggered.

[0006] Preferably, the flange ring comprises an inner flange ring, a middle flange ring and an outer flange ring which are arranged in sequence from the inside to the outside in radial direction; the mating groove is a U-shaped groove and is 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 assembly hole formed by the combination has a waist-shaped hole shape with the hole length extending radially along the flange ring.

[0007] Preferably, a semicircular groove is recessed on the top surface of the flange seat, and a semicircular rod-shaped pressure arm is hinged at the notch on one side of the semicircular groove; when the cantilever end of the pressure arm is fixed to the notch on the other side of the semicircular groove, the pressure arm and the semicircular groove are combined to form a positioning hole for coaxially pressing and fixing the outer flange ring, and the inner flange ring, the middle flange ring and the outer flange ring are all split in half, and their split surfaces coincide with the axis of the positioning hole; a turntable is rotatably matched at the inner annular surface of the inner flange ring, and matching grooves for forming assembly holes are also arranged at the outer edge of the turntable and the outer annular surface of the inner flange ring.

[0008] 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 each component can form a guide rail mating relationship through the clamping of the annular ridges and the annular grooves.

[0009] Preferably, radially from the inside to the outside, the number of assembly holes formed by the combination of matching grooves evenly distributed on the outer edge of the turntable and the outer ring surfaces of each flange ring are 4, 8, and 12 respectively; circumferentially of the middle flange ring, the first matching groove, the fourth matching groove, the eighth matching groove and the twelfth matching groove on the outer ring surface of the middle flange ring all penetrate the middle flange ring body, thereby being connected with the first matching groove, the third matching groove, the fifth matching groove and the seventh matching groove on the inner ring surface, thereby cross-dividing the middle flange ring into a four-equal structure.

[0010] Preferably, the flange seat includes a base and a plumb plate arranged vertically on the base, and the semicircular groove is arranged on the top of the plumb plate; the plumb plate is hinged to the top surface of the base through a horizontal hinge seat with an adjustable hinge angle, and the axis of the horizontal hinge seat is parallel to the axis of the positioning hole.

[0011] Preferably, a supporting plate is fitted onto the inner surface of the vertical plate, and the top surface of the supporting plate constitutes a supporting surface for supporting the outer edge of the flange of the valve from bottom to top.

[0012] Preferably, a test device using the flange clamp is characterized in that: there are two groups of flange clamps; a drive head for twisting the valve handle between the two groups of flange clamps is arranged directly above the two groups of flange clamps, and the bottom end of the drive head is recessed with a slot for snapping into the valve handle; the test device also includes a servo motor, and the output end of the servo motor is selectively connected to the first reducer and the second reducer through a coupling, the second reducer is a two-speed reducer, and there is a difference in the reduction ratio of the first reducer and the second reducer; the top end of the drive head is selectively connected to the output end of one of the reducers, so as to achieve the rotation action by relying on the servo motor; an angle encoder and a torque sensor are arranged at the drive head.

[0013] Preferably, the two sets of flange clamps are slidably assembled on the work surface through a horizontal transverse track, so that the two sets of flange clamps can produce coaxial approaching and separating movements along the horizontal transverse track; the horizontal transverse track is a T-shaped slide, and a slider is provided at the flange seat to form a guide rail sliding matching relationship with the horizontal transverse track; the horizontal transverse track slide rail is matched on the longitudinal sliding guide rail, so that the horizontal transverse track and the longitudinal sliding guide rail are combined to form a cross-adjustable slide rail system.

[0014] Preferably, a test system using the test device is characterized in that it includes a pressure loading component; a medium interface for connecting the inlet and outlet of the pressure loading component is arranged at the axis of the flange clamp, and a sealing member is arranged at the medium interface so that the valve cavity forms a sealed cavity, and 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 switch valve V6, the seventh switch valve V7, the water tank, the first switch valve V1, the water pump, the check valve, the second switch valve V2, the booster container, the fifth switch valve V5, the second pressure sensor P2 and the The second temperature sensor T2 then enters the medium interface at the second set of flange clamps; the two ends of the booster pump are respectively connected to the water tank and the inlet end of the second switch 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 booster container, so that the medium can be connected to the outlet end of the fifth switch valve V5 after passing through the third switch valve V3, the preheating container and the fourth switch valve V4 in sequence; one end of the cold test pipeline is connected to the outlet end of the sixth switch valve V6, so that the medium can be connected to the water tank after passing through the eighth switch valve V8, the cooling module and the ninth switch valve V9 in sequence.

[0015] The beneficial effects of the present invention are:

[0016] 1) Abandoning the traditional single flange clamp that can only match a single valve's one-to-one installation and fixing structure, a rotatable flange ring system is adopted to use the assembly hole formed by the natural matching grooves of two adjacent flange rings, thereby actually forming a multi-circle variable assembly hole structure from the inside out. Each circle of assembly holes can match valves of corresponding specifications and sizes, so that one machine can be used for multiple purposes to meet the fixing needs of valves of multiple specifications and sizes, and ultimately effectively expand the breadth of use of a single valve reliability test device.

[0017] What is more noteworthy is that, on the one hand, since the flange rings can be rotated at any angle relative to each other and adjusted at any angle, it is possible to assemble assembly holes for valves that are suitable for different standard systems such as American standards, national standards, and ship standards; on the other hand, due to the rotatability of each flange ring, when one circle of assembly holes is formed, the matching grooves of other circles will be in a misaligned state and unable to form assembly holes, thereby greatly ensuring the structural strength and working stability of the entire flange assembly surface.

[0018] At this point, 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 compatible with the installation of valves of different standards, different calibers and pressure levels to the maximum extent, and can even install the valve at any angle. By utilizing the rotation characteristics of the flange ring, the handwheel can finally 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.

[0019] 2) In actual design, the flange ring is at least three layers, including the inner flange ring, the middle flange ring and the outer flange ring, so as to realize the forming requirement of at least two circles of assembly holes. Considering that even in the same layer of assembly holes, valves of different specifications and sizes may be installed within a certain margin, the final assembly holes should be waist-shaped holes to reserve sufficient margin to realize the adaptability of assembly requirements.

[0020] 3) Furthermore, when the flange rings rotate relative to each other, how to ensure that the adjacent flange rings are connected to each other and not easily disconnected is a factor to be considered. In actual design, the present invention preferably adopts the mutual clamping of grooves and edges, thereby achieving the axial limit and circumferential guide functions of adjacent flange rings to ensure the reliability of the equipment.

[0021] 4) During actual assembly, the flange rings can be directly assembled as a whole by means of thermal expansion of the bearing, etc.; or, as described in the present invention, a split flange ring can be used in combination with a flange seat with a detachable pressure arm, thereby achieving the purpose of sequential placement and assembly of the flange rings, thereby improving the convenience and flexibility of operation.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the flange clamp;

[0027] Figure 2 for Figure 1 Exploded diagram of the structure;

[0028] Figure 3 and Figure 4 This is the usage status diagram of the flange ring;

[0029] Figure 5 A schematic diagram of the three-dimensional structure of one embodiment of the test device;

[0030] Figure 6 for Figure 5 The assembly position diagram of the two sets of flange clamps in FIG.

[0031] Figure 7 This is the piping layout diagram of the test system.

[0032] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0033] a-valve

[0034] 10-flange seat 11-semicircular groove 12-pressure arm

[0035] 13-base 14-plumb plate 15-horizontal hinge seat 16-support plate

[0036] 21-outer flange ring 22-middle flange ring 23-inner flange ring 24-matching groove

[0037] 25-turntable 26-medium interface

[0038] 31- annular ridge 32- annular groove 40- driving head 50- servo motor

[0039] 61- horizontal sliding track 61a- horizontal slide 62- longitudinal sliding guide rail

[0040] 71- water tank 72- water pump 73- booster container 74- booster pump

[0041] 75- preheating container 76- cooling module DETAILED DESCRIPTION

[0042] For ease of understanding, here we combine Figure 1-7The specific structure and working mode of the present invention are further described as follows:

[0043] The specific structure of the present invention is as follows Figure 1-7 As shown, its main structure includes a flange clamp, a work surface for mounting the flange clamp, a cross-adjusting slide rail system on the work surface, a valve drive control component located above the flange clamp, and a corresponding pressure loading control component, etc. Among them:

[0044] Flange clamp structure reference Figure 1-4 and Figure 6 As shown, 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 increased or decreased as appropriate, and three layers are the best, which can adapt to valves a of different specifications and sizes to the greatest extent.

[0045] exist Figure 1-4 It can be seen that the flange ring forms an inner flange ring 23, a middle flange ring 22 and an outer flange ring 21 from the inside to the outside; to ensure the rotation of the flange ring, an annular ridge 31 and an annular groove 32 are arranged between the inner ring surface of the outer flange ring 21, the inner ring surface and the outer ring surface of the middle flange ring 22, and the outer ring surface of the inner flange ring 23, so that the axial deviation of the three-layer flange ring is limited by the guide rail cooperation between the annular ridge 31 and the annular groove 32, and the relative rotation function of each flange ring is ensured. 16 U-shaped matching grooves 24 are arranged on the inner ring surface of the outer flange ring 21; and to ensure the strength of the flange ring, the matching grooves 24 are not evenly distributed across the center line, but are arranged 7.5 degrees counterclockwise with the center line, so as to reasonably distribute the 16 grooves. 16 matching grooves 24 are arranged on the outer ring surface of the middle flange ring 22 to match the corresponding grooves at the outer flange ring 21, forming the required outer 16 waist-shaped assembly holes. The inner ring surface of the middle flange ring 22 is provided with 8 matching grooves 24, so as to match the 8 matching grooves 24 provided on the outer ring surface of the inner flange ring 23, thereby forming the required 8 waist-shaped assembly holes in the middle layer. Figure 3-4 In the embodiment, a rotating disk 25 is coaxially penetrated at the inner flange ring 23, a medium interface 26 is arranged at the axis of the rotating disk 25, and four matching grooves 24 are recessed at the outer edge of the rotating disk 25, so as to match the four matching grooves 24 at the inner flange ring 23 to form four inner waist-shaped assembly holes. Considering that the middle flange ring 22 has the function of connecting the upper and lower parts, there are too many matching grooves 24 arranged on it, so two of the matching grooves 24 arranged symmetrically on the axis can be designed as through grooves to optimize the layout.

[0046] During operation, the turntable 25 can be rotated to fit on the inner ring surface of the inner flange ring 23, or it can form an integral structure with the inner flange ring 23. When the valve a needs to be fixed, the two ends of the valve a can be clamped by cooperating with each other by two sets of flange clamps. At the same time, by reasonably adjusting the position of the flange ring at the flange clamp, the bolt fixing function of the flange surfaces at both ends of the valve a can be realized. When reliability testing is required in a simulated medium working environment, a threaded interface-shaped medium interface 26 can be arranged at the center of the outer end surface of the turntable 25 and connected to the test pipeline. The sealing groove and the sealing blind plate can be used to ensure the sealing at the center of the inner end surface.

[0047] Since the three layers of flange rings at the flange clamp can be rotated at any angle relative to each other, 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 of different standard systems such as American standard, national standard, and ship standard.

[0048] In actual use, such as Figure 3-4 The flange rings shown need to be assembled on the flange seat 10. The appearance of the flange seat 10 is shown in FIG. Figure 1-2 As shown, it includes a base 13 and a plumb plate 14 arranged vertically on the base 13. A semicircular groove 11 is recessed on the top of the plumb plate 14, and a semicircular arc rod-shaped pressure arm 12 hinged at a notch on one side of the semicircular groove 11 is used to achieve the combination effect. Figure 2 The positioning holes shown in the figure are provided to facilitate installation of the flange rings. The outer flange ring 21 and the positioning holes can also be provided with Figure 2 The cooperation of the annular ridge 31 and the annular groove 32 ensures the rotation state of the two. To ensure the convenient disassembly and assembly of the flange ring, the outer flange ring 21 and the inner flange ring 23 can be arranged as a half-split structure; of course, the middle flange ring 22 is a four-part body, so it naturally forms a split structure.

[0049] like Figure 1 and Figure 6 As shown, the base 13 and the plumb plate 14 are hinged to each other through a horizontal hinge seat 15, so that the angle of the plumb plate 14 can be adjusted from 0° to 90°; even the horizontal hinge seat 15 itself can be designed as a plumb height adjustable mechanism through waist-shaped hole adjustment and other methods, so as to achieve the adjustment function of the positioning hole height; of course, this function can also be achieved by adding gaskets and other methods. At the same time, a support plate 16 is set on the inner side of the plumb plate 14 facing the other group of flange clamps, and the support plate 16 relies on the waist-shaped hole to achieve the adjustable function of the plumb height, so as to achieve the effect of adjusting the valve center height. Through the above adjustment, the present invention can adapt to the installation of straight-through valves, angle valves and non-standard valves with inconsistent flange inlet and outlet center lines.

[0050] from Figure 6It can be seen that a cross-adjustable slide rail system is arranged between the base 13 and the work platform, that is, it includes a horizontal lateral track 61 and a longitudinal sliding guide rail 62. For the horizontal lateral track 61, the present invention relies on the guide block 12 with rollers to be slidably assembled on the horizontal lateral track 61; on the other hand, it utilizes the inherent characteristics of the horizontal lateral track 61 as a T-slot workbench to achieve conventional fastening between the base 13 and the horizontal lateral track 61 through the cooperation of bolts and nuts. Considering that the size of the roller is larger than the notch of the T-slot-shaped horizontal slide groove 61a, it can be as follows Figure 6 As shown, a through hole is arranged partially in the horizontal slide groove 61a to facilitate the assembly of the guide block 12; of course, the guide block 12 can also be directly inserted from the end of the horizontal transverse track 61 to achieve assembly, which will not be repeated 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 with the top surface or upper surface of the horizontal transverse track 61. At the same time, a longitudinal sliding guide rail 62 can also be arranged under the horizontal transverse track 61. It can be considered to rely on a longitudinal motor and a threaded screw to achieve a reciprocating pushing effect on the horizontal transverse track 61. Of course, it can also be matched with a linear drive source such as a piston cylinder to cooperate to achieve the purpose of XY-axis double-action sliding for valve a.

[0051] On the basis of the above structure, two sets of valve drive control components can be arranged on the work surface 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.

[0052] The active valve drive is relatively simple. In actual design, electric actuators, pneumatic actuators, electro-hydraulic actuators, etc. can be added as appropriate to achieve functions such as power supply of different parameters, adjustment of feedback analog output, and provision of different air pressures, thereby achieving pneumatic, electric and hydraulic drive effects for the active valve. This is relatively conventional and will not be elaborated here.

[0053] like Figure 5As 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., a second reducer, a coupling, a torque sensor, an angle encoder, etc., so as to realize the accurate measurement of the full-range torque range of the device within the large range of "0-1T-10T-100T". The servo motor 50 can realize the switching connection with the first reducer and the two-speed reducer through an electromagnetic coupling. When the drive head 40 needs to accurately output the large torque of the device range interval "10T-100T" for testing, the servo motor 50 is connected to the first reducer through an electromagnetic coupling; when the drive head 40 needs to accurately output the conventional torque of the device range interval "1T-10T" for measurement, the servo motor 50 is connected to the two-speed reducer through an electromagnetic coupling, and at this time, the internal input shaft of the two-speed reducer is connected to the planetary gear and the output shaft of the drive head 40. Even when the valve under test needs the drive head 40 to accurately output a small torque of "0-1T" within the measuring range for measurement, the servo motor 50 is connected to the dual-speed reducer through an electromagnetic coupling, and the internal switching system of the dual-speed reducer disconnects the input shaft from the gear and directly connects it to the output shaft of the drive head 40 to achieve dual-speed switching, and the reduction ratio is 1 at this time. Of course, the structure and operation mode of the dual-speed reducer and the first reducer are conventional technologies, so their working principles will not be described in detail.

[0054] Further, the present invention also provides Figure 7 The pressure loading assembly shown includes a water tank 71, a booster pump 74, a water pump 72, a booster container 73, a preheating container 75, a cooling module 76 and corresponding pressure sensors and temperature sensors. During operation, the medium enters the medium interface 26 at the second group of flange clamps 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 switch valve V6, the seventh switch valve V7, the water tank 71, the first switch valve V1, the water pump 72, the check valve, the second switch valve V2, the boosting container 73, the fifth switch valve V5, the second pressure sensor P2 and the second temperature sensor T2; the two ends of the boosting pump 74 are respectively connected to the water tank 71 and the inlet end of the second switch 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 boosting container 73, so that the medium can be connected to the outlet end of the fifth switch valve V5 after passing through the third switch valve V3, the preheating container 75 and the fourth switch valve V4 in sequence; one end of the cold test pipeline is connected to the outlet end of the sixth switch valve V6, so that the medium can be connected to the water tank 71 after passing through the eighth switch valve V8, the cooling module 76 and the ninth switch valve V9 in sequence.

[0055] During actual testing, the pressure loading assembly can be used in conjunction with the aforementioned test device to perform valve reliability testing in cold and hot states, as follows:

[0056] Cold reliability test process:

[0057] 1. Before the test, the valve under test is in a 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 booster container 73 through the water pump 72, and the booster pump 74 is started for boosting. After the pressure in the booster container 73 rises to the test pressure P, the fifth valve V5 is opened. At this time, the pressure before the valve under test is P, and the pressure after the valve is 0, and the valve is in a closed state under full pressure difference.

[0058] 2. The tested valve is opened, the fifth valve V5 is closed, the sixth valve V6 and the seventh valve V7 are opened, the tested valve is depressurized, and the medium is circulated back to the water tank 71. Then, the sixth valve V6 and the seventh valve V7 are closed, and the tested valve remains in the open state; the fifth valve V5 is opened, and the pressure in the valve cavity rises to 60%P of the test pressure, and the tested valve begins to close.

[0059] 3. After the valve under test is closed, a test cycle is completed, and then steps 1 and 2 are repeated in sequence until the test number is reached and the test ends.

[0060] Thermal reliability test process:

[0061] a. Before the test begins, the valve under test is in a closed state. After the test begins, 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 pressurized container 73 through the water pump 72. The booster pump 74 is started to increase the pressure, and the pressure in the pressurized container 73 is raised to the test pressure P. The fifth valve V5 is always kept closed, 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 before the valve under test is P, and the pressure after the valve is 0, and it is in a closed state under the full pressure difference.

[0062] b. The tested valve 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 is always closed. The tested valve is depressurized, and the medium is circulated back to the water tank 71 through the cooling module 76. Then, the sixth valve V6, the eighth valve V8, and the ninth valve V9 are closed, and the tested valve is still kept in the open state; the fourth valve V4 is opened, and the pressure in the valve cavity rises to 60% P of the test pressure, and the test temperature T is maintained, and the tested valve begins to close.

[0063] c. After the valve under test is closed, a test cycle is completed, and then steps a and b are repeated in sequence until the test number is reached and the test ends.

[0064] Of course, it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0065] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0066] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A flange clamp based on valve reliability test, characterized by: It comprises a flange seat (10) and a flange ring mounted on the flange seat (10); the flange rings are three coaxially sleeved and rotatably matched with each other; matching grooves (24) are radially recessed at the matching surfaces of two adjacent flange rings, so that the matching grooves (24) can be matched to form an assembly hole for fixing the valve flange by relying on the relative rotation of the two adjacent flange rings; among the three flange rings, when the matching grooves (24) at two of the matching flange rings are combined to form the assembly hole, the matching grooves (24) at the other two matching flange rings are staggered.

2. The flange clamp based on valve reliability test according to claim 1 is characterized in that: The flange ring comprises an inner flange ring (23), a middle flange ring (22) and an outer flange ring (21) which are arranged in order from the inside to the outside in radial direction; the matching groove (24) is in the form of a U-shaped groove and is respectively 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 assembled hole formed by the combination is in the form of a waist-shaped hole with a hole length extending radially along the flange ring.

3. The flange clamp based on valve reliability test according to claim 2 is characterized in that: The top surface of the flange seat (10) is concavely provided with a semicircular groove (11), and a semicircular rod-shaped pressure arm (12) is hingedly connected to a notch on one side of the semicircular groove (11); when the cantilever end of the pressure arm (12) is fixed to the notch on the other side of the semicircular groove (11), the pressure arm (12) and the semicircular groove (11) are combined to 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 half-split structures, and their split surfaces coincide with the axis of the positioning hole; a turntable (25) is rotatably matched at the inner annular surface of the inner flange ring (23), and a matching groove (24) for forming an assembly hole is also arranged at the outer edge of the turntable (25) and the outer annular surface of the inner flange ring (23).

4. The flange clamp based on valve reliability test according to claim 3 is characterized in that: Annular ridges (31) and annular grooves (32) are 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 matching surfaces of each component can form a guide rail matching relationship through the clamping of the annular ridges (31) and the annular grooves (32).

5. The flange clamp based on valve reliability test according to claim 2, 3 or 4, characterized in that: From the inside to the outside in the radial direction, the number of assembly holes formed by the evenly distributed matching grooves (24) on the outer edge of the rotating disk (25) and the outer annular surfaces of each flange ring are 4, 8, and 12 respectively; in the circumferential direction of the middle flange ring (22), the first matching groove, the fourth matching groove, the eighth matching groove, and the twelfth matching groove on the outer annular surface of the middle flange ring (22) all penetrate the ring body of the middle flange ring (22), thereby being connected with the first matching groove, the third matching groove, the fifth matching groove, and the seventh matching groove on the inner annular surface, thereby cross-dividing the middle flange ring (22) into a four-equal structure.

6. The flange clamp based on valve reliability test according to claim 3 or 4, characterized in that: The flange seat (10) comprises a base (13) and a plumb plate (14) arranged vertically on the base (13), the semicircular groove (11) being arranged at the top end of the plumb plate (14); the plumb plate (14) is hinged to the top surface of the base (13) via a horizontal hinge seat (15) having an adjustable hinge angle, and the axis of the horizontal hinge seat (15) is parallel to the axis of the positioning hole.

7. The flange clamp based on valve reliability test according to claim 6 is characterized in that: A support plate (16) is fitted onto the inner surface of the vertical plate (14), and the top surface of the support plate (16) forms a support surface for supporting the outer edge of the flange of the valve from bottom to top.

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