Valve durability experiment equipment

Abstract

The invention relates to the technical field of low-temperature valve testing, in particular to valve durability experiment equipment which comprises a base plate, a constant-temperature movable bin and a constant-temperature fixed bin, the base plate serves as an assembly foundation of the constant-temperature fixed bin, the constant-temperature movable bin and the constant-temperature fixed bin are oppositely arranged, and the constant-temperature movable bin is combined with the constant-temperature fixed bin in a butt joint mode after being subjected to driving force. A closed cavity is formed between the two; a clamping ring used for restraining the position of the to-be-tested valve is arranged in the constant-temperature movable bin, and the clamping ring moves synchronously after driving force is applied to the to-be-tested valve. According to the invention, the constant-temperature movable bin and the constant-temperature fixed bin which are mutually butted and combined are designed as a test environment of a valve to be tested, and after the constant-temperature movable bin and the constant-temperature fixed bin are closed, refrigeration equipment such as a low-temperature refrigerator is used for manufacturing cold air and inputting the cold air into the closed cavity, so that the purpose of cooling the test environment is achieved; the experiment efficiency of the durability experiment of the low-temperature valve is effectively improved, the cost is reduced, and the experiment requirements of conventional low-temperature valves are met.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic valve testing, and particularly to an experimental device for the durability performance of valves. Background Art

[0002] Valves can be divided into high-temperature valves, normal-temperature valves, cryogenic valves, etc. according to the working temperature. A cryogenic valve refers to a valve whose conveying medium temperature is in the range of -40°C to -196°C. Common cryogenic valves include cryogenic butterfly valves, cryogenic gate valves, cryogenic ball valves, cryogenic globe valves, cryogenic check valves, cryogenic throttle valves, etc.

[0003] In the prior art, when conducting durability performance experiments on cryogenic valves with an applicable temperature range of -196°C and below, liquid nitrogen is generally used to cool them down. However, when conducting performance experiments on cryogenic valves with an applicable temperature range higher than -80°C, there are many limitations in using liquid nitrogen for cooling. On the one hand, the refrigeration temperature of liquid nitrogen far exceeds the applicable temperature of such valves. On the other hand, using liquid nitrogen for cooling requires special operation skills and safety measures, and the production, storage, and transportation costs of liquid nitrogen are relatively high. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems in the related art to some extent. For this purpose, the object of the present invention is to provide an experimental device for the durability performance of valves, which conducts durability performance experiments on cryogenic valves used in non-extreme environments to improve the experimental efficiency and reduce costs.

[0005] To achieve the above object, the first aspect embodiment of the present invention provides an experimental device for the durability performance of valves, including: a substrate, a constant-temperature moving chamber, and a constant-temperature fixed chamber. The constant-temperature fixed chamber uses the substrate as an assembly basis. The constant-temperature moving chamber and the constant-temperature fixed chamber are arranged opposite to each other. After the constant-temperature moving chamber is subjected to a driving force, it is docked and combined with the constant-temperature fixed chamber to form a sealed cavity between the two.

[0006] A clamping ring for restricting the position of the valve to be tested is arranged inside the constant-temperature moving chamber. After applying a driving force to the valve to be tested, the clamping ring moves synchronously.

[0007] Sealing plugs and temperature sensors are arranged at the positions corresponding to the inlets and outlets of the valve to be tested inside the constant-temperature fixed chamber. The sealing plugs are used to convey the medium to the valve to be tested, and at least one sealing plug is tightly abutted against the port of the valve to be tested after being subjected to a driving force. A flow sensor and a pressure sensor are also arranged at the sealing plug.

[0008] Locking and sealing components and cooling components are provided on both sides of the constant-temperature movable bin and the constant-temperature fixed bin. Among them, the locking and sealing components are used to apply pressure to the constant-temperature movable bin after the constant-temperature movable bin and the constant-temperature fixed bin are combined together to improve the sealing performance after the docking of the constant-temperature movable bin and the constant-temperature fixed bin; the cooling components are used to input cold air into the closed cavity formed by the constant-temperature movable bin and the constant-temperature fixed bin to reduce the temperature of the cavity.

[0009] According to an embodiment of the present invention, a first slide rail is installed above the substrate, and a sliding plate is installed at the bottom of the constant-temperature movable bin. The sliding plate is slidably connected to the first slide rail through a first slider at its bottom.

[0010] According to an embodiment of the present invention, a spring column and a bracket are embedded on the surface of the constant-temperature movable bin facing the constant-temperature fixed bin. The spring column is vertically arranged compared with the horizontally arranged substrate. One end of the bracket is slidably sleeved on the spring column, and the other end of the bracket extends towards the constant-temperature fixed bin and is connected with the clamping ring. The clamping ring slides along the direction of the spring column under the action of a driving force.

[0011] According to an embodiment of the present invention, the sealing plug head includes a base, a transition sleeve and a frustum arranged in sequence from bottom to top. The three are an integral hollow structure, and the outer diameters of the transition sleeve and the frustum gradually decrease from bottom to top; a plurality of gaskets are also sleeved outside the transition sleeve and the frustum.

[0012] According to an embodiment of the present invention, a plurality of guide rods are installed above the substrate corresponding to the position of the constant-temperature fixed bin, and the tops of the guide rods are connected with a cover plate;

[0013] Two of the sealing plug heads are symmetrically arranged inside the constant-temperature fixed bin in a mirror image manner. A first hydraulic cylinder is installed at the cover plate. The output end of the first hydraulic cylinder sequentially penetrates through the cover plate and the top of the constant-temperature fixed bin and then extends downward and is connected with one of the sealing plug heads.

[0014] According to an embodiment of the present invention, the locking and sealing component includes a first base and a second hydraulic cylinder installed on the top of the first base. The position of the second hydraulic cylinder corresponds to the position of the constant-temperature movable bin after the docking combination of the constant-temperature movable bin and the constant-temperature fixed bin. The output end of the second hydraulic cylinder is connected with an extrusion head, and the extrusion head has a trapezoidal structure.

[0015] According to an embodiment of the present invention, the cooling component includes a second base and a mounting plate installed on the top of the second base. The mounting plate is horizontally arranged. One end of the mounting plate is installed with a second electric push rod. A second slide rail is arranged above the mounting plate. The output end of the second electric push rod is connected with a second slider, and the second slider is slidably connected to the second slide rail;

[0016] The top of the second slider is connected with a fixing frame. Both ends of the fixing frame are respectively provided with a hollow shaft motor and a sealing plate. The output shaft of the hollow shaft motor is a hollow output shaft, and the hollow output shaft penetrates through the sealing plate. Through holes are respectively formed in two sides of the constant temperature bin corresponding to the position of the hollow output shaft. The sealing plate is used to block the through holes during the refrigeration process, and the hollow output shaft is used to input the cold air manufactured by an external refrigeration device into the interior of the constant temperature bin.

[0017] According to an embodiment of the present invention, two limiting plates are arranged on one side of the sealing plate facing the constant temperature bin. The two limiting plates are symmetrically arranged about the hollow output shaft, and a limiting member is arranged between the two limiting plates;

[0018] The limiting member is in threaded connection with the hollow output shaft. The outer wall of the limiting member is respectively attached to the corresponding limiting plates. The surface of the end of the hollow output shaft extending into the constant temperature bin is smooth, and a return spring is arranged between the end of the limiting plate and the limiting member.

[0019] According to an embodiment of the present invention, the limiting member includes a movable seat. Limiting strips are arranged on the inner wall of the limiting plate. Limiting grooves are formed in the movable seat corresponding to the positions of the limiting strips, and the limiting grooves are slidably connected with the limiting strips;

[0020] One side of the movable seat facing the constant temperature bin is recessed inward, and two rollers are symmetrically arranged about the hollow output shaft at the recessed part;

[0021] Both sides of the movable seat are rotatably connected with side plates, torsion springs are arranged at the rotation joints, and guiding grooves are respectively formed at the top and bottom of the side plates.

[0022] According to an embodiment of the present invention, a fixing plate and a movable plate are sequentially arranged from top to bottom between two adjacent guide rods. Both ends of the movable plate are slidably sleeved on the guide rods. An electric push rod I is installed at the bottom of the fixing plate, the output end of the electric push rod I is connected with the movable plate, a vacuum pump is installed at the bottom of the movable plate, the air inlet of the vacuum pump faces downward, and a through pipe communicating with the inner cavity of the constant temperature bin is arranged at the position of the constant temperature bin corresponding to the vacuum pump.

[0023] The valve durability performance experimental equipment according to the embodiment of the present invention designs a thermostatic moving chamber and a thermostatic fixed chamber that are mutually docked and combined as the test environment for the valve to be tested. After the thermostatic moving chamber and the thermostatic fixed chamber are closed, a refrigeration device such as a low-temperature refrigerator is used to manufacture cold air and input it into the sealed cavity to achieve the purpose of cooling the test environment. At the same time, a limiting member is also provided to limit the valve to be tested, ensuring that the sealing plug can accurately dock with the inlet and outlet of the valve to be tested, effectively improving the experimental efficiency of the durability performance experiment of this type of low-temperature valve used in non-extreme environments and reducing the experimental cost. It has the advantages of high experimental efficiency and simple operation, and meets the experimental requirements of conventional types of low-temperature valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the three-dimensional structural view of an embodiment of the present invention Figure 1 ;

[0025] Figure 2 is the side view of an embodiment of the present invention;

[0026] Figure 3 is the three-dimensional structural schematic diagram of the thermostatic moving chamber in an embodiment of the present invention Figure 1 ;

[0027] Figure 4 is the three-dimensional structural schematic diagram of the thermostatic moving chamber in an embodiment of the present invention Figure 2 ;

[0028] Figure 5 is the three-dimensional structural schematic diagram of the locking and sealing assembly in an embodiment of the present invention;

[0029] Figure 6 is the three-dimensional structural schematic diagram of the interior of the thermostatic fixed chamber in an embodiment of the present invention;

[0030] Figure 7 is the three-dimensional structural schematic diagram of the cooling assembly in an embodiment of the present invention;

[0031] Figure 8 is the three-dimensional structural schematic diagram of the fixing frame, hollow shaft motor, sealing plate and limiting member in an embodiment of the present invention;

[0032] Figure 9 is the three-dimensional structural schematic diagram of the limiting member in an embodiment of the present invention;

[0033] Figure 10 is the three-dimensional structural schematic diagram of the sealing plug in an embodiment of the present invention;

[0034] Figure 11 is the three-dimensional structural view of an embodiment of the present invention Figure 2 .

[0035] In the figure: 1. Substrate; 11. First slide rail; 12. First slider; 13. Support leg; 14. Guide rod; 141. Fixed plate; 142. Movable plate; 143. First electric push rod; 144. Vacuum pump; 15. Cover plate; 2. Constant temperature movable chamber; 21. Slide plate; 22. Pull rod; 23. Spring column; 24. Bracket; 25. Snap ring; 26. Sealing strip; 3. Constant temperature fixed chamber; 31. Sealing groove; 32. Connecting pipe; 4. Locking and sealing assembly; 41. First base; 42. Second hydraulic cylinder; 43. Extrusion head; 5. Cooling component; 51. Second base; 52. Mounting plate; 53. Second electric push rod; 54. Second slide rail; 55. Second slider; 56. Fixed frame; 57. Hollow shaft motor; 571. Hollow output shaft; 572. Output port; 58. Sealing plate; 581. Limiting plate; 582. Limiting strip; 59. Limiting part; 591. Movable seat; 592. Limiting groove; 593. Roller; 594. Side plate; 6. Sealing plug head; 61. Base; 62. Transition sleeve; 63. Frustum; 64. Washer; 7. First hydraulic cylinder; 8. Output pipe; 9. Input pipe. Detailed implementation mode

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0037] The valve durability performance test equipment of the embodiments of the present invention will be described below with reference to the drawings.

[0038] As Figure 1 and Figure 2 shown, a valve durability performance test equipment includes a substrate 1, a constant temperature movable chamber 2 and a constant temperature fixed chamber 3. The constant temperature fixed chamber 3 takes the substrate 1 as an assembly basis. The constant temperature movable chamber 2 and the constant temperature fixed chamber 3 are arranged opposite to each other. After the constant temperature movable chamber 2 is subjected to a driving force, it is docked and combined with the constant temperature fixed chamber 3 to form a sealed cavity therebetween. Inside the constant temperature movable chamber 2, there is a snap ring 25 for restricting the position of the valve to be tested. After applying a driving force to the valve to be tested, the snap ring 25 is displaced synchronously. At the bottom of the substrate 1, there are support legs 13 for lifting the substrate 1 to a certain height.

[0039] Inside the constant temperature fixed chamber 3, at the positions corresponding to the inlets and outlets of the valve to be tested, there are sealing plug heads 6 and temperature sensors. The sealing plug heads 6 are used to convey media to the valve to be tested, and at least one sealing plug head 6 is tightly abutted against the port of the valve to be tested after being subjected to a driving force. A flow sensor and a pressure sensor are also arranged at the sealing plug head 6.

[0040] On both sides of the constant-temperature movable bin 2 and the constant-temperature fixed bin 3, there are provided a locking and sealing assembly 4 and a cooling assembly 5. Among them, the locking and sealing assembly 4 is used to apply pressure to the constant-temperature movable bin 2 after the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 are combined together, so as to improve the sealing performance after the docking of the constant-temperature movable bin 2 and the constant-temperature fixed bin 3; the cooling assembly 5 is used to input cold air into the closed cavity formed by the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 to reduce the temperature of the cavity.

[0041] According to the above technical solution, when conducting an experiment on the valve to be tested, first, the valve to be tested is clamped with the snap ring 25 to make the directions of the inlet and outlet of the valve to be tested consistent with the direction of the internal sealing plug 6 of the constant-temperature fixed bin 3. Then, the constant-temperature movable bin 2 is driven to move towards the constant-temperature fixed bin 3 until the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 are docked and combined together; the position of the constant-temperature movable bin 2 is further restricted by the locking and sealing assembly 4 to ensure that the cavity formed between the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 has good tightness. At this time, the axis of the inlet and outlet of the valve to be tested is collinear with the axis of the sealing plug 6. The sealing plug 6 can be driven to closely close the inlet and outlet of the valve to be tested, and cold air is manufactured by an external refrigeration device and input into the closed cavity by the cooling assembly 5 to reduce the temperature of the cavity. When the temperature sensor monitors that the temperature of the cavity has reached the predetermined temperature, a medium is conveyed to the inlet of the valve to be tested through the sealing plug 6, and the medium is discharged through the outlet of the valve to be tested. During the process, the performance of the valve is monitored in real time by a flow sensor and a pressure sensor. After a period of monitoring, it is judged whether the performance of the valve is qualified according to the sensor data.

[0042] This technical solution designs the mutually docked and combined constant-temperature movable bin 2 and constant-temperature fixed bin 3 as the test environment for the valve to be tested. After the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 are closed, a refrigeration device is used to manufacture cold air and input it into the closed cavity, so as to achieve the purpose of cooling the test environment, effectively improving the experimental efficiency of the durability performance experiment of this type of low-temperature valve used in a non-extreme environment and reducing the experimental cost. It has the advantages of high experimental efficiency and simple operation, and meets the experimental requirements of conventional types of low-temperature valves.

[0043] Specifically, the external refrigeration device can be a low-temperature air conditioner.

[0044] In some embodiments of the present invention, as Figure 1 shown, two first slide rails 11 are installed in parallel above the substrate 1. The bottom of the constant-temperature movable bin 2 is provided with a slide plate 21. The slide plate 21 is slidably connected to the first slide rail 11 through a first slider 12 at its bottom. A pull rod 22 is also installed on the side of the slide plate 21.

[0045] Specifically, according to the different driving methods of the constant-temperature movable bin 2, its usage methods also vary. It can either be manually pushed or pulled by hand through the pull rod 22 to move the sliding plate 21 and the constant-temperature movable bin 2, or a driving source such as a cylinder or a motor screw rod can be used to drive the sliding plate 21 and the constant-temperature movable bin 2 to move along the first slide rail 11. The docking design of the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 not only facilitates the installation and removal of the valve to be tested, but also the open structure after separation is beneficial for the staff to analyze the deficiencies of the equipment and is conducive to iterative improvement.

[0046] In some embodiments of the present invention, as Figure 4 shown, on the side of the constant-temperature movable bin 2 facing the constant-temperature fixed bin 3, a spring column 23 and a bracket 24 are embedded and installed. The spring column 23 is vertically arranged compared to the horizontally arranged base plate 1. One end of the bracket 24 is slidably sleeved on the spring column 23, and the other end of the bracket 24 extends towards the constant-temperature fixed bin 3 and is connected with a clamping ring 25. Among them, both the spring column 23 and the clamping ring 25 are made of stainless steel or copper alloy. After being subjected to a vertical driving force, the clamping ring 25 and the bracket 24 will slide along the direction of the spring column 23. Since the valve to be tested is generally of a cylindrical structure, an arc-shaped groove is provided on the clamping ring 25, and the outer wall of the valve to be tested is clamped through the arc-shaped groove of the clamping ring 25 to fix the valve to be tested.

[0047] It should be noted that in this embodiment, after the valve to be tested is clamped with the clamping ring 25, the whole valve to be tested is in a vertical state with respect to the base plate 1, and the inlet and outlet of the valve to be tested are located at its top and bottom respectively.

[0048] In some embodiments of the present invention, as Figure 4 、 Figure 6 shown, a closed sealing strip 26 is provided at the edge of the docking surface of the constant-temperature movable bin 2, and a sealing groove 31 is provided at the edge of the docking surface of the constant-temperature fixed bin 3. The sealing strip 26 is made of silica gel and still has good ductility at low temperatures. When the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 are docked, the fitting of the sealing strip 26 and the sealing groove 31 can improve the sealing performance of the closed cavity and is beneficial for the rapid reduction of the temperature in the cavity.

[0049] In some embodiments of the present invention, as Figure 2 、 Figure 5As shown, the locking and sealing assembly 4 includes a first base 41 and a second hydraulic cylinder 42 installed on the top of the first base 41. The output end of the second hydraulic cylinder 42 is connected with an extrusion head 43, and the extrusion head 43 is in a trapezoidal structure; the position of the second hydraulic cylinder 42 corresponds to the position of the constant-temperature moving bin 2 after the constant-temperature moving bin 2 and the constant-temperature fixed bin 3 are docked and combined, and the stroke direction of the output end of the second hydraulic cylinder 42 intersects and is perpendicular to the moving direction of the constant-temperature moving bin 2. Specifically, in this embodiment, both the constant-temperature moving bin 2 and the constant-temperature fixed bin 3 are three-dimensional structures that are narrower at the top and wider at the bottom. After the constant-temperature moving bin 2 and the constant-temperature fixed bin 3 are docked and combined, the second hydraulic cylinders 42 on both sides of the constant-temperature moving bin 2 are activated. The output end of the second hydraulic cylinder 42 drives the extrusion head 43 to move towards the constant-temperature moving bin 2, and the inclined surface of the extrusion head 43 abuts against the outer wall of the constant-temperature moving bin 2. As the output end of the second hydraulic cylinder 42 further moves, the extrusion head 43 will gradually restrict and define the position of the constant-temperature moving bin 2 until the output end of the second hydraulic cylinder 42 cannot move. At this time, the position of the constant-temperature moving bin 2 is completely locked, and the tightness between the constant-temperature moving bin 2 and the constant-temperature fixed bin 3 is better.

[0050] In some embodiments of the present invention, as Figure 2 , Figure 6 shown, a total of four guide rods 14 are installed above the substrate 1 corresponding to the positions on both sides of the constant-temperature fixed bin 3. The top of the guide rod 14 is connected with a cover plate 15, and a first hydraulic cylinder 7 is installed at the cover plate 15. And two sealing plugs 6 are symmetrically arranged inside the constant-temperature fixed bin 3 in a mirror image. Since the inlets and outlets of the valve to be tested face upward and downward respectively after being clamped with the snap ring 25, the ends of the two sealing plugs 6 are also arranged oppositely. The output end of the first hydraulic cylinder 7 sequentially penetrates through the cover plate 15 and the top of the constant-temperature fixed bin 3 and then extends downward and is connected with the upper sealing plug 6, and the other sealing plug 6 is installed at the bottom of the constant-temperature fixed bin 3.

[0051] Specifically, after the constant-temperature moving bin 2 and the constant-temperature fixed bin 3 are docked and combined, the snap ring 25 and the valve to be tested are exactly located between the upper and lower sealing plugs 6. By driving the upper sealing plug 6 to move downward through the first hydraulic cylinder 7, when the sealing plug 6 abuts against the inlet of the valve to be tested, the upper sealing plug 6 will further squeeze the valve to be tested to make it displace downward, so that the outlet of the valve to be tested abuts against the lower sealing plug 6. At this time, the snap ring 25 and the bracket 24 will synchronously displace downward along the spring column 23 until the upper and lower sealing plugs 6 are hermetically connected to the inlets and outlets of the valve to be tested.

[0052] In some embodiments of the present invention, as Figure 6 , Figure 10As shown, the sealing plug 6 includes a base 61, a transition sleeve 62, and a frustum 63 arranged in sequence from bottom to top. The three are an integral hollow structure, and a through hole is provided at the top of the frustum 63. The outer diameters of the transition sleeve 62 and the frustum 63 gradually decrease from bottom to top, so as to facilitate adapting to the size changes of different valve inlets and outlets when the sealing plug 6 is docked with the inlets and outlets of the valve to be tested. When docking, the top end of the frustum 63 will first extend into the valve inlet and outlet, and then according to the caliber size of the inlet and outlet, the bottom end of the frustum 63 or the transition sleeve 62 will closely abut against the valve inlet and outlet; A plurality of gaskets 64 are also sleeved outside the transition sleeve 62 and the frustum 63. The gaskets 64 are also made of silica gel, further improving the sealing effect between the sealing plug 6 and the inlets and outlets of the valve to be tested.

[0053] It should be noted that, as Figure 2 、 Figure 11 shown, an input pipe 9 is connected to the sealing plug 6 above the constant temperature bin 3. The input pipe 9 is used to input the medium into the valve to be tested, while an output pipe 8 is connected to the sealing plug 6 below the constant temperature bin 3. The output pipe 8 is used to receive the medium flowing out through the valve to be tested. Among them, the input pipe 9 is a flexible pipe because the sealing plug 6 above has a need for vertical movement.

[0054] In some embodiments of the present invention, as Figure 2 、 Figure 6 、 Figure 7 shown, the cooling component 5 includes a second base 51 and a mounting plate 52 mounted on the top of the second base 51. The mounting plate 52 is horizontally arranged. One end of the mounting plate 52 is provided with a second electric push rod 53. A second slide rail 54 is arranged above the mounting plate 52. The output end of the second electric push rod 53 is connected with a second slider 55. The second slider 55 is slidably connected with the second slide rail 54. The top of the second slider 55 is connected with a fixing frame 56. After the second electric push rod 53 is started, the second slider 55 drives the fixing frame 56 to move towards the constant temperature bin 3.

[0055] A hollow shaft motor 57 and a sealing plate 58 are respectively arranged at both ends of the fixing frame 56. The rotating shaft of the hollow shaft motor 57 is a hollow output shaft 571. Threads are provided on the surface of the hollow output shaft 571. One end of the hollow output shaft 571 penetrates through the sealing plate 58 and extends a certain distance towards the constant temperature bin 3. Through holes are respectively penetrated at the positions corresponding to the hollow output shaft 571 on both sides of the constant temperature bin 3. As the second electric push rod 53 pushes the fixing frame 56 to move, the end of the hollow output shaft 571 will be inserted into the constant temperature bin 3 through the through hole. After the hollow output shaft 571 is inserted in place, the sealing plate 58 can be used to block the above through hole during the refrigeration process. The hollow shaft motor 57 is synchronously started, and the hollow output shaft 571 continuously rotates and inputs the cold air manufactured by the external refrigeration equipment into the constant temperature bin 3 during the rotation process.

[0056] In some embodiments of the present invention, as Figure 8 shown, the port where the hollow output shaft 571 extends into the interior of the constant temperature chamber 3 remains closed, and an output port 572 is provided on the side surface of the hollow output shaft 571. The output port 572 is used to input cold air into the interior of the constant temperature chamber 3. This is because if the cold air blows directly on the surface of the valve to be tested through the port of the hollow output shaft 571, it may cause the local temperature of the valve to be too low, resulting in a temperature gradient and problems such as low-temperature seizure, such as deformation of the non-metallic valve seat and seal failure. In addition, it may also cause uneven cooling of the valve surface, affecting the accuracy of the test results. Therefore, through research, in this embodiment, the cold air is filled into the space gradually from other directions through the output port 572 on the side surface of the hollow output shaft 571, which can make the valve and its surrounding environment reach a relatively uniform temperature, reduce the temperature gradient, and reduce the risk of low-temperature seizure, and can also more accurately evaluate the low-temperature performance of the valve. At the same time, since the hollow output shaft 571 keeps rotating during the process of extending into the constant temperature chamber 3, the direction of the output port 572 is also constantly changing, and the cold air is input into the interior of the sealed cavity along the circumferential direction, thereby accelerating the spread speed of the cold air in the sealed cavity and improving the cooling effect.

[0057] It should be noted that although most of the valves to be tested are cylindrical structures, the weights at both ends of different types of valves are different, which may cause the valve to be tested to swing around the snap ring 25 when it is clamped by the snap ring 25, that is, the whole valve to be tested is inclined relative to the sealing plug 6. Therefore, in some embodiments of the present invention, a limiting member 59 is further provided to further limit the position of the valve to be tested and prevent it from swinging.

[0058] As Figure 7 、 Figure 8 shown, two limiting plates 581 are provided on the side of the sealing plate 58 facing the constant temperature chamber 3. The length of the limiting plates 581 is the same as the extension length of the hollow output shaft 571 extending into the constant temperature chamber 3, and the two limiting plates 581 are symmetrically arranged with respect to the hollow output shaft 571. A limiting member 59 is provided between the two limiting plates 581. The outer wall of the limiting member 59 is respectively in contact with the inner wall of the corresponding limiting plate 581. The surface of the end of the hollow output shaft 571 extending into the constant temperature chamber 3 is smooth, that is, no thread is formed, and a return spring is provided between the end of the limiting plate 581 and the limiting member 59.

[0059] As Figure 9 shown, the limiting member 59 includes a movable seat 591. The middle part of the movable seat 591 is threadedly connected to the hollow output shaft 571. A limiting strip 582 is provided on the inner wall of the limiting plate 581. A limiting groove 592 is provided at the position of the movable seat 591 corresponding to the limiting strip 582. The limiting groove 592 is slidably connected to the limiting strip 582. After starting the hollow shaft motor 57, as the hollow output shaft 571 rotates, the movable seat 591 will move along the hollow output shaft 571.

[0060] One side of the movable seat 591 facing the constant-temperature fixed bin 3 is recessed inward, and two rollers 593 are symmetrically arranged about the hollow output shaft 571 in the recessed part. Both rollers 593 are made of silica gel. Both sides of the movable seat 591 are rotatably connected with side plates 594, and torsion springs are arranged at the rotation joints. A certain distance is left between the two side plates 594. Guide grooves are formed at the top and bottom of the side plates 594, and the guide grooves are concave inclined grooves.

[0061] When the valve to be tested swings after being clamped with the snap ring 25, at this time, after the constant-temperature movable bin 2 and the constant-temperature fixed bin 3 are docked and combined, the fixed frame 56 can be pushed integrally towards the constant-temperature fixed bin 3 by the electric push rod two 53 until the hollow output shaft 571 and the limit plate 581 are inserted into the sealed cavity, and the sealing plate 58 blocks the through hole on the side of the constant-temperature fixed bin 3. At this time, there is still a certain distance between the end of the hollow output shaft 571 and the valve to be tested; start the hollow shaft motor 57 synchronously. During the rotation of the hollow output shaft 571, the movable seat 591 is driven to move towards the valve to be tested, and the return spring is compressed until the movable seat 591 moves to the end of the hollow output shaft 571. During this process, because the surface of the end of the hollow output shaft 571 here is smooth, after the movable seat 591 is pushed to its end by the hollow output shaft 571, on the one hand, at this time, the side plates 594 on both sides of the movable seat 591 are flipped after abutting against the surface of the valve to be tested, and the two flipped side plates 594 hold the outer wall of the valve to be tested under the action of the torsion spring, and the rollers 593 abut against the surface of the valve to be tested, and the hollow shaft motors 57 on both sides apply relative pressures at the same time to firmly constrain the position of the valve to be tested and constrain the whole valve to be tested to keep vertical; on the other hand, because the movable seat 591 moved to the end of the hollow output shaft 571 is not threadedly connected with the hollow output shaft 571, the hollow output shaft 571 can rotate normally, so that the direction of the output port 572 rotates circumferentially. After the position of the valve to be tested is vertically limited by the limiting member 59, the hydraulic cylinder one 7 can be normally started, and the sealing plug head 6 above will push the valve to be tested to move downward. At this time, the limiting member 59 will ensure that the valve to be tested remains stable and does not swing during the vertical movement. The guide grooves formed at the top and bottom of the side plates 594 can ensure that the side plates 594 cross the uneven positions on the surface of the valve to be tested and avoid the side plates 594 from abutting against certain positions on the surface of the valve to be tested. The rollers 593 keep rotating during the contact with the valve to be tested and guide the valve to be tested to move downward until the inlet and outlet of the valve to be tested are both tightly connected with the sealing plug head 6;

[0062] At the end of the test, reverse the rotation direction of the hollow output shaft 571. At this time, under the compression and thrust of the return spring, the movable seat 591 exits from the smooth end of the surface of the hollow output shaft 571 and is re-threaded with the threaded part on the surface of the hollow output shaft 571. At this time, the movable seat 591 is separated from the valve; at the same time, the fixed frame 56 can also be reset integrally by the second electric push rod 53, and the hollow shaft motor 57 and the hollow output shaft 571 move synchronously to the outside of the constant temperature bin 3, which also plays a role in releasing the valve.

[0063] It should be noted that although the snap ring 25 may swing when fixing this type of valve with different head and tail weights, due to its simple snap connection structure, the installation process of the valve to be tested before the test and the removal process of the valve after the test are both relatively convenient, thus improving the experimental efficiency. Moreover, since the valve itself will still have a relatively low temperature after the test, if a more complex fixing structure is set to fix the valve, not only the efficiency is low and the process is complex, but also it may cause harm to the user during the process of removing the valve.

[0064] In some embodiments of the present invention, as Figure 11 shown, a fixing plate 141 and a movable plate 142 are sequentially arranged from top to bottom between two adjacent guide rods 14. The two ends of the movable plate 142 are slidably sleeved on the guide rods 14. An electric push rod 143 is installed at the bottom of the fixing plate 141, and the output end of the electric push rod 143 is connected to the movable plate 142. A vacuum pump 144 is installed at the bottom of the movable plate 142, and the air inlet of the vacuum pump 144 faces downward. A through pipe 32 communicating with the inner cavity of the constant temperature bin 3 is arranged at the position of the constant temperature bin 3 corresponding to the vacuum pump 144, and a pipe cap is generally hermetically connected to the through pipe 32.

[0065] Before injecting cold air into the sealed cavity formed by the constant temperature moving bin 2 and the constant temperature bin 3, the pipe cap can be opened, and then the electric push rod 143 is started to drive the movable plate 142 to move downward until the air inlet of the vacuum pump 144 is inserted into the through pipe 32. After using a soft film to wrap the connection part between the two, the vacuum pump 144 can be started to exhaust the air in the sealed cavity. By pumping out the air, the number of gas molecules in the sealed cavity is reduced, and the thermal resistance of heat conduction and convection is reduced, so that the cold air can contact and cool the sealed cavity and the valve to be tested inside it more quickly, providing favorable conditions for the subsequent cooling of the sealed cavity by the cold air.

[0066] It should be noted that after the vacuum pump 144 pumps air for a period of time, the vacuum pump 144 needs to be reset, and the through pipe 32 is blocked with a pipe cap. At this time, the airtightness of the sealed cavity is better, and a higher cooling efficiency can be achieved.

[0067] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0069] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A valve durability performance test device, comprising a base plate (1), a constant temperature moving chamber (2) and a constant temperature fixed chamber (3), characterized in that: The constant temperature fixed chamber (3) uses the base plate (1) as an assembly basis, the constant temperature movable chamber (2) and the constant temperature fixed chamber (3) are arranged relative to each other, and the constant temperature movable chamber (2) is connected and assembled with the constant temperature fixed chamber (3) after being acted upon by a driving force, so that a closed cavity is formed between the two. A clamping ring (25) for restraining the position of the valve to be tested is arranged inside the constant temperature moving chamber (2), and the clamping ring (25) is displaced synchronously after a driving force is applied to the valve to be tested; Sealing plugs (6) and temperature sensors are arranged at positions corresponding to the inlet and outlet of the valve to be tested inside the constant temperature fixed chamber (3), the sealing plugs (6) being used to convey the medium to the valve to be tested, and at least one sealing plug (6) is tightly abutted against the port of the valve to be tested after being acted upon by a driving force, and a flow sensor and a pressure sensor are also arranged at the sealing plug (6); A locking sealing component (4) and a cooling component (5) are provided on both sides of the constant temperature moving chamber (2) and the constant temperature fixed chamber (3), wherein the locking sealing component (4) is used to apply pressure to the constant temperature moving chamber (2) after the constant temperature moving chamber (2) and the constant temperature fixed chamber (3) are combined together to improve the sealing performance of the constant temperature moving chamber (2) and the constant temperature fixed chamber (3) after they are connected; and the cooling component (5) is used to input cold air into the closed cavity formed by the constant temperature moving chamber (2) and the constant temperature fixed chamber (3) to reduce the temperature of the cavity.

2. The valve durability performance test equipment according to claim 1, characterized in that: A slide rail (11) is installed above the base plate (1), and a slide plate (21) is installed at the bottom of the constant temperature dynamic chamber (2). The slide plate (21) is slidably connected to the slide rail (11) via a slider (12) at the bottom thereof.

3. The valve durability performance test equipment according to claim 1, characterized in that: A spring column (23) and a bracket (24) are embedded and installed on a side of the constant temperature moving chamber (2) facing the constant temperature fixed chamber (3); the spring column (23) is vertically arranged compared to the horizontally arranged base plate (1); one end of the bracket (24) is slidably sleeved with the spring column (23); the other end of the bracket (24) extends toward the constant temperature fixed chamber (3) and is connected to the snap ring (25); the snap ring (25) slides along the direction of the spring column (23) after being acted upon by a driving force.

4. The valve durability performance test equipment according to claim 1, characterized in that The sealing plug (6) includes a base (61), a transition sleeve (62) and a cone (63) which are arranged in sequence from bottom to top. The three are an integrated hollow structure, and the outer diameters of the transition sleeve (62) and the cone (63) gradually decrease from bottom to top; a plurality of gaskets (64) are also sleeved on the outside of the transition sleeve (62) and the cone (63).

5. The valve durability performance test equipment according to claim 1, characterized in that: A plurality of guide rods (14) are installed above the base plate (1) at positions corresponding to the constant temperature chamber (3), and a cover plate (15) is connected to the top of the guide rods (14); Two of the sealing plugs (6) are arranged in a mirror-symmetrical manner inside the constant temperature chamber (3), and a hydraulic cylinder (7) is installed on the cover plate (15). The output end of the hydraulic cylinder (7) passes through the cover plate (15) and the top of the constant temperature chamber (3) in sequence, then extends downward and is connected to one of the sealing plugs (6).

6. The valve durability performance test equipment according to claim 1, characterized in that: The locking seal assembly (4) comprises a base one (41) and a hydraulic cylinder two (42) mounted on the top of the base one (41); the position of the hydraulic cylinder two (42) corresponds to the position of the constant temperature movable chamber (2) after the constant temperature movable chamber (2) and the constant temperature fixed chamber (3) are docked and assembled; the output end of the hydraulic cylinder two (42) is connected to an extrusion head (43); the extrusion head (43) is in a trapezoidal structure.

7. The valve durability performance test equipment according to claim 1, characterized in that: The cooling component (5) comprises a second base (51) and a mounting plate (52) mounted on the top of the second base (51), the mounting plate (52) being arranged horizontally, a second electric push rod (53) being mounted on one end of the mounting plate (52), a second slide rail (54) being arranged above the mounting plate (52), a second slide rail (55) being connected to the output end of the second electric push rod (53), and the second slide rail (55) being slidably connected to the second slide rail (54); The top of the slider 2 (55) is connected to a fixing frame (56), and the two ends of the fixing frame (56) are respectively provided with a hollow shaft motor (57) and a sealing plate (58), the output shaft of the hollow shaft motor (57) is a hollow output shaft (571), and the hollow output shaft (571) passes through the sealing plate (58), and through holes are opened on both sides of the constant temperature fixed chamber (3) corresponding to the positions of the hollow output shaft (571), and the sealing plate (58) is used to block the above-mentioned through holes during the refrigeration process, and the hollow output shaft (571) is used to input the cold air produced by the external refrigeration equipment into the interior of the constant temperature fixed chamber (3).

8. The valve durability performance test equipment according to claim 7, characterized in that: Two limit plates (581) are arranged on one side of the sealing plate (58) facing the constant temperature and fixed chamber (3); the two limit plates (581) are arranged mirror-symmetrically with respect to the hollow output shaft (571); and a limit member (59) is arranged between the two limit plates (581); The limiting member (59) is threadedly connected to the hollow output shaft (571), and the outer walls of the limiting member (59) are respectively fitted with the limiting plates (581) at corresponding positions. The surface of one end of the hollow output shaft (571) extending into the constant temperature chamber (3) is smooth, and a return spring is arranged between the end of the limiting plate (581) and the limiting member (59).

9. The valve durability performance test equipment according to claim 8, characterized in that: The limiting member (59) comprises a movable seat (591), a limiting strip (582) is arranged on the inner wall of the limiting plate (581), a limiting groove (592) is provided on the movable seat (591) corresponding to the position of the limiting strip (582), and the limiting groove (592) is slidably connected to the limiting strip (582); The movable seat (591) is recessed inwardly on one side facing the constant temperature fixed chamber (3), and two rollers (593) are arranged at the recessed part in a mirror-symmetrical manner with respect to the hollow output shaft (571); Both sides of the movable seat (591) are rotatably connected to side plates (594), and a torsion spring is provided at the rotatable connection. The top and bottom of the side plates (594) are formed with guide grooves.

10. The valve durability performance test equipment according to claim 5, characterized in that: A fixed plate (141) and a movable plate (142) are arranged in sequence from top to bottom between two adjacent guide rods (14), and both ends of the movable plate (142) are slidably sleeved with the guide rods (14). An electric push rod (143) is installed at the bottom of the fixed plate (141), and the output end of the electric push rod (143) is connected to the movable plate (142). A vacuum pump (144) is installed at the bottom of the movable plate (142), and the air inlet of the vacuum pump (144) faces downward. A through pipe (32) connected to the inner cavity of the constant temperature and fixed chamber (3) is arranged at a position of the constant temperature and fixed chamber (3) corresponding to the vacuum pump (144).

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