A device for testing the pressure drop characteristics of a regulating valve

Abstract

The utility model relates to governing valve, specifically is a kind of governing valve pressure drop characteristic testing device, comprising: test board, the top of test board is provided with two mutually symmetrical clamping components left and right, the top of test board is placed with valve body, the opposite face of two clamping components is mutually close, and finally adhere to the both ends of valve body, the opposite face of two clamping components is connected with air inlet end and exhaust end respectively, air inlet end and exhaust end are communicated with the both ends of valve body by clamping component;The clamping component includes the clamping plate of sliding connection in the top of test board, the top of test board is also slidingly connected with two left and right adhering plates.The utility model has the beneficial effect that after testing end and valve body are removed, can be under the elastic restoring force of reset spring, so that adhering plate seals the outside of gas injection hole on the surface of gas injection head again, to effectively avoid the condition that dust contacts gas injection hole and then pollutes valve body.

Description

Technical Field

[0001] This utility model relates to the field of valve body testing technology, specifically to a device for testing the pressure drop characteristics of a regulating valve. Background Technology

[0002] Control valves belong to the control valve series. Their main function is to regulate parameters such as pressure, flow rate, and temperature of the medium. They are the final control element in the process loop.

[0003] In the automatic control of modern factories, regulating valves play a very important role. The production of these factories depends on the correct distribution and control of the flowing medium. Whether it is energy exchange, pressure reduction or simple container feeding, these controls all rely on regulating valves to assist in their implementation.

[0004] As is well known, before fluid enters the valve body through the pipeline, it flows into the valve body only through the gap between the edge of the valve core end face and the valve body inlet. This results in a small flow area at the inlet, whereas the flow area within the pipeline is larger. Therefore, when the fluid flows between these two points, a pressure drop and increased flow resistance occur. The pressure drop performance of a control valve is crucial to its operating environment and function, especially when the flow rate and velocity of the fluid after passing through the valve body are required to be high. The pressure drop characteristics of the control valve are needed to ensure the regulating ratio after the fluid passes through the control valve. Current control valve pressure drop testing devices require sealing both ends of the valve body and injecting media for pressure drop testing. This requires the valve body plug to have a nozzle for injecting media. Since the plug is exposed, the nozzle is also exposed. Over time, dust and other pollutants in the air will inevitably accumulate on the nozzle, contaminating it. After sealing the valve body, the media will carry dust into the valve body, contaminating the valve core and increasing wear or even damage to the valve body.

[0005] Therefore, it is necessary to develop a pressure drop characteristic testing device for regulating valves to address the shortcomings of existing technologies. Utility Model Content

[0006] This invention addresses the technical problems existing in the prior art by providing a device for testing the pressure drop characteristics of a regulating valve.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A pressure drop characteristic testing device for a regulating valve includes: a test platform, on the top of which are two symmetrical clamping components, a valve body is placed on the top of the test platform, the facing surfaces of the two clamping components are close to each other and finally fit against both ends of the valve body, and the facing back surfaces of the two clamping components are respectively connected to an air inlet end and an air outlet end, and the air inlet end and the air outlet end are connected to both ends of the valve body through the clamping components. The clamping assembly includes a clamping plate slidably connected to the top of the test platform. The top of the test platform also has two slidably connected left and right mating plates located between the opposing surfaces of the two clamping plates. Each clamping plate and mating plate corresponds to one another. An injection head is fixedly connected to the side of the clamping plate closest to the mating plate. The mating plate is sealed and fitted onto the outer surface of the injection head. The outer surface of the injection head has several injection holes that fit against the inner side of the mating plate. A return spring is provided outside the injection head, abutting against and connected between the clamping plate and the mating plate. A limit rod is movably fitted inside the clamping plate. One end of the limit rod is connected to the mating plate. A connecting seat is fixedly connected to the side of the clamping plate away from the mating plate. The air inlet and exhaust ends are connected to the clamping plate through corresponding connecting seats.

[0008] The beneficial effects of this utility model are as follows: Under the constraint of the return spring, the bonding plate can slide relative to the clamping plate along the outer surface of the air injection head. After the two clamping components clamp and adhere tightly to the valve body, the air injection hole can be exposed due to the sliding of the bonding plate. Through the cooperation of the air injection hole and the air injection head, air can be easily injected into the valve body sealed at both ends to test the pressure drop performance of the valve body. At the same time, after the test is completed and the valve body is removed, the bonding plate can be sealed again on the outside of the air injection hole on the surface of the air injection head under the elastic restoring force of the return spring, thereby effectively preventing dust from contacting the air injection hole and thus contaminating the valve body.

[0009] Furthermore, the bonding plate slides along the outer surface of the air injection head and eventually exposes the outer end of the air injection hole; the air injection head has a cavity structure, with several air injection holes evenly distributed on the outer surface of the bonding plate, one end of the air injection hole is connected to the air inlet end and the air outlet end through the air injection head and the connecting seat, and the other end of the air injection hole is connected to one end of the valve body.

[0010] Furthermore, the limiting rod is composed of a tapered section and a cylindrical section, wherein the cylindrical section is slidably sleeved inside the clamping plate, one end of the cylindrical section passes through the clamping plate and is fixedly connected to the bonding plate, and the other end of the cylindrical section passes through the clamping plate and is connected to one end of the tapered section. The outer circumferential diameter of the tapered section near the clamping plate is smaller than the outer circumferential diameter of its other end.

[0011] Due to the cylindrical section, in conjunction with the air injection head, the bonding plate can move smoothly relative to the clamping plate on the top of the test bench. Then, under the elastic restoring force of the return spring and the supporting force of the valve body, the bonding plate moves back and forth smoothly, thereby ensuring the sealing effect on the outer end of the air injection hole on the outer surface of the air injection head.

[0012] Furthermore, the outer diameter of the air injection hole is smaller than the thickness of the bonding plate. When the tapered section of the limiting rod is fully attached to the clamping plate, the bonding plate and the side of the air injection head away from the clamping plate are flush with each other. At this time, the outer end of the air injection hole is completely sealed and attached to the inner side of the bonding plate.

[0013] Due to the conical section, the movement range of the bonding plate relative to the clamping plate can be limited by the cooperation of the cylindrical section and the constraint of the clamping plate. This ensures that when the bonding plate moves back and forth, it can fully expose the outer end of the air injection hole so that it can connect with one end of the valve body, while also completely sealing the outer end of the air injection hole to achieve the effect of protection.

[0014] Furthermore, a positioning component is provided in the middle of the test platform, located below the valve body between the two clamping components and the two clamping components. The two ends of the positioning component extend to both sides of the test platform, and the upper ends of the two ends of the positioning component extend to the top of the test platform and are respectively connected to the bottom of the two clamping plates. The test platform is also provided with symmetrical linkage components located on the front and rear sides of the positioning component. The two ends of the linkage components are connected to the front and rear ends of the two clamping plates. Several supports are provided at the bottom of the test platform, and the outer surface of the supports is rough.

[0015] Furthermore, the positioning component includes a slide groove formed on the top of the test platform, with two sliders slidingly engaged inside the slide groove. The inner wall of the slide groove and the outer surface of the sliders are both smooth. The top of the sliders passes through the slide groove and extends to the top of the test platform, and is fixedly connected to the bottom of a corresponding clamping plate.

[0016] The clamping plate facilitates the movement of the slider while also restricting it, allowing the corresponding clamping assembly to slide smoothly along the top of the test bench, thus ensuring a tight fit between the two ends of the valve body.

[0017] Furthermore, a positioning rod is inserted inside the slider, and helical teeth are provided on the outer surface of the positioning rod and one side of the inner wall of the slider. The arc length of the arc surface where the helical teeth are located is less than half of the circumference of the outer surface of the positioning rod and the inner wall of the slider. The outer surface of the positioning rod is connected to the inner wall of the slider through the helical teeth.

[0018] Due to the arrangement of the helical teeth, the two positioning rods can slide rapidly relative to the outside of the slider when engaged on the non-helical tooth side between the positioning rod and the slider. At the same time, rotating the slider so that its outer surface contacts and meshes with the helical teeth inside the positioning rod can restrict the movement of the positioning rod, thereby keeping the two positioning rods and the two clamping components connected to their tops relatively stationary, thus clamping the valve body and achieving a rapid clamping effect.

[0019] Furthermore, the two ends of the positioning rod pass through the slider and the groove and extend to both sides of the test platform, and are fixedly connected with knobs. The two ends of the positioning rod are rotatably connected to the two ends of the test platform through bearings. The top of the slider is provided with a slot, and the bottom of the bonding plate is slidably engaged with the inside of the slot.

[0020] Furthermore, the linkage assembly includes a linkage groove formed on the top of the test bench. A linkage gear is rotatably connected to the middle of the linkage groove via a bearing. Two linkage rods, symmetrical about the center of the linkage gear, are arranged inside the linkage groove. The opposing surfaces of the two linkage rods are respectively meshed and connected to the front and rear sides of the outer surface of the linkage gear. One end of the linkage rod is away from the linkage gear, passes through the linkage groove and extends to the top of the test bench, and is fixedly connected to the front and rear sides of the bottom of a corresponding clamping plate.

[0021] Due to the linkage gear, the two linkage rods can move synchronously relative to each other under the constraint of the linkage groove. This allows the two clamping components connected to them to move synchronously relative to each other. As a result, moving either clamping component can make the two clamping components slide synchronously and quickly relative to each other or in opposite directions, effectively improving clamping or disassembly efficiency.

[0022] Furthermore, the interior of the linkage groove is fitted with a sealing cover located above the linkage gear and linkage rod from top to bottom. The top of the sealing cover is flush with the top of the test platform. Two sliding cavities are provided on the front and rear sides of the sealing cover, symmetrical about the axis of the linkage gear. One end of the linkage rod passes through the sliding cavity and extends to the top of the test platform.

[0023] The sealing cover protects the linkage gears and linkage rods inside the linkage slot, and with the cooperation of the sliding cavity, ensures that one end of the linkage rod can extend through the sliding cavity to the top of the test platform and connect with a corresponding clamping plate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front view of the present invention; Figure 3 This is a schematic diagram of the positioning rod of this utility model; Figure 4 This is a sectional view of the front of the present invention; Figure 5 for Figure 4 A partial schematic diagram of the middle limit rod; Figure 6 This is a cross-sectional view of the top of the slide groove of this utility model.

[0025] The attached diagram lists the components represented by each number as follows: 1. Test stand; 2. Clamping assembly; 21. Clamping plate; 22. Adhesive plate; 23. Air injection head; 24. Air injection hole; 25. Return spring; 26. Limiting rod; 27. Connecting seat; 3. Air inlet end; 4. Air outlet end; 5. Positioning assembly; 51. Slide groove; 52. Slider; 53. Positioning rod; 54. Helical gear; 55. Knob; 56. Slot; 6. Linkage assembly; 61. Linkage groove; 62. Linkage gear; 63. Linkage rod; 64. Sealing cover; 65. Slide cavity; 7. Bracket. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0029] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0030] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0031] Example like Figures 1 to 6 As shown, a pressure drop characteristic testing device for a regulating valve includes: a test bench 1, two symmetrical clamping components 2 are provided on the top of the test bench 1, a valve body is placed on the top of the test bench 1, the opposing surfaces of the two clamping components 2 are close to each other and finally fit against the two ends of the valve body, the opposing back surfaces of the two clamping components 2 are respectively connected to an air inlet end 3 and an air outlet end 4, and the air inlet end 3 and the air outlet end 4 are connected to the two ends of the valve body through the clamping components 2; The clamping assembly 2 includes a clamping plate 21 slidably connected to the top of the test bench 1. Two mating plates 22 are also slidably connected to the top of the test bench 1, located between the facing surfaces of the two clamping plates 21. The clamping plates 21 and mating plates 22 correspond one-to-one. An air injection head 23 is fixedly connected to the side of the clamping plate 21 closest to the mating plate 22. The mating plate 22 is sealed and fitted onto the outer surface of the air injection head 23. Several air injection holes 24 are provided on the outer surface of the air injection head 23, fitting against the inner side of the mating plate 22. A return spring 25 is provided on the outside of the air injection head 23, abutting against and connected between the clamping plate 21 and the mating plate 22. A limit rod 26 is movably fitted inside the clamping plate 21. One end of the limit rod 26 is connected to the mating plate 22, and the side of the clamping plate 21 away from the mating plate 22 is fixed. The valve body is connected by a connecting seat 27. The air inlet end 3 and the exhaust end 4 are connected to the clamping plate 21 through the corresponding connecting seat 27. Under the restriction of the return spring 25, the bonding plate 22 can slide relative to the clamping plate 21 along the outer surface of the air injection head 23. After the two clamping components 2 clamp and adhere tightly to the valve body, the air injection hole 24 can be exposed due to the sliding of the bonding plate 22. Through the cooperation of the air injection hole 24 and the air injection head 23, air can be easily injected into the valve body sealed at both ends to test the pressure drop performance of the valve body. At the same time, when the test is completed and the valve body is removed, the bonding plate 22 can be used again to seal the outside of the air injection hole 24 on the surface of the air injection head 23 under the elastic restoring force of the return spring 25, thereby effectively preventing dust from contacting the air injection hole 24 and contaminating the valve body.

[0032] Place the valve body on the test bench 1. Move one of the clamping plates 21, and with the cooperation of the two linkage components 6, the other clamping plate 21 will move synchronously with it, so that the two clamping components 2 will move closer to each other synchronously until the two clamping plates 21 slide along the outer surface of the air injection head 23 under the support of the two ends of the valve body and compress the return spring 25 relative to the clamping plate 21, so that the outer end of the air injection hole 24 is exposed. Then rotate the knob 55 to make the helical teeth 54 on the outer surface of the positioning rod 53 mesh with the helical teeth 54 on the inner wall of the slider 52 to fix the two clamping components 2. At this point, an external air pump can be connected to inject air into the valve body through the air inlet 3 and the air outlet 4 to complete the pressure drop test of the valve body.

[0033] The bonding plate 22 slides along the outer surface of the air injection head 23 and eventually exposes the outer end of the air injection hole 24. The air injection head 23 has a cavity structure, and several air injection holes 24 are evenly distributed on the outer surface of the bonding plate 22. One end of the air injection hole 24 is connected to the air inlet end 3 and the air outlet end 4 through the air injection head 23 and the connecting seat 27, and the other end of the air injection hole 24 is connected to one end of the valve body.

[0034] The limiting rod 26 consists of a conical section and a cylindrical section. The cylindrical section is slidably sleeved inside the clamping plate 21. One end of the cylindrical section passes through the clamping plate 21 and is fixedly connected to the bonding plate 22. The other end of the cylindrical section passes through the clamping plate 21 and is connected to one end of the conical section. The outer diameter of the conical section near the clamping plate 21 is smaller than the outer diameter of its other end. Due to the cylindrical section, with the cooperation of the air injection head 23, the bonding plate 22 can move smoothly relative to the clamping plate 21 along the top of the test platform 1. Then, under the elastic restoring force of the return spring 25 and the holding force of the valve body, the bonding plate 22 moves smoothly back and forth, thereby ensuring the sealing effect on the outer end of the air injection hole 24 on the outer surface of the air injection head 23.

[0035] Wherein, the outer diameter of the air injection hole 24 is smaller than the thickness of the bonding plate 22. When the tapered section of the limiting rod 26 is fully attached to the clamping plate 21, the side of the bonding plate 22 and the air injection head 23 away from the clamping plate 21 are flush with each other. At this time, the outer end of the air injection hole 24 is completely sealed and attached to the inner side of the bonding plate 22. Due to the setting of the tapered section, the movement range of the bonding plate 22 relative to the clamping plate 21 can be limited by the cooperation of the cylindrical section and the restriction of the clamping plate 21. This ensures that when the bonding plate 22 moves back and forth, the outer end of the air injection hole 24 can be fully exposed so that it can be connected to one end of the valve body. At the same time, the outer end of the air injection hole 24 can be completely blocked to achieve the effect of protecting it.

[0036] The test bench 1 has a positioning component 5 located in the middle of the two clamping components 2 and below the valve body between them. The two ends of the positioning component 5 extend to the two sides of the test bench 1, and the upper ends of the two ends of the positioning component 5 extend to the top of the test bench 1 and are respectively connected to the bottom of the two clamping plates 21. The test bench 1 also has a linkage component 6 located on the front and rear sides of the positioning component 5 and symmetrical to each other. The two ends of the linkage component 6 are connected to the front and rear ends of the two clamping plates 21. The bottom of the test bench 1 has several supports 7, and the outer surface of the supports 7 is rough.

[0037] The positioning component 5 includes a slide groove 51 on the top of the test bench 1. Two sliders 52 are slidably engaged inside the slide groove 51. The inner wall of the slide groove 51 and the outer surface of the sliders 52 are smooth. The top of the sliders 52 passes through the slide groove 51 and extends to the top of the test bench 1, and is fixedly connected to the bottom of a corresponding clamping plate 21. Due to the setting of the clamping plate 21, the sliders 52 can be moved easily, and the sliders 52 can also be used to restrict the sliders 52, so that they can drive the corresponding clamping component 2 to slide smoothly along the top of the test bench 1, thereby ensuring that it can fit tightly against both ends of the valve body.

[0038] The slider 52 has a positioning rod 53 inside. Both the outer surface of the positioning rod 53 and one side of the inner wall of the slider 52 are provided with helical teeth 54. The arc length of the arc surface containing the helical teeth 54 is less than half the circumference of the outer surface of the positioning rod 53 and the inner wall of the slider 52. The outer surface of the positioning rod 53 is connected to the inner wall of the slider 52 through the helical teeth 54. Due to the helical teeth 54, the two positioning rods 53 can slide rapidly relative to the outside of the slider 52 with the cooperation of the non-helical teeth 54 side between the positioning rod 53 and the slider 52. Simultaneously, rotating the slider 52 so that its outer surface contacts and engages with the helical teeth 54 inside the positioning rod 53 restricts the movement of the positioning rods 53. This keeps the two positioning rods 53 and the two clamping components 2 connected to their tops relatively stationary, thereby clamping the valve body and achieving a rapid clamping effect.

[0039] The positioning rod 53 has two ends that pass through the slider 52 and the groove 51 and extend to both sides of the test platform 1, and is fixedly connected to the knob 55. The two ends of the positioning rod 53 are rotatably connected to the two ends of the test platform 1 through bearings. The top of the slider 52 has a slot 56, and the bottom of the bonding plate 22 is slidably engaged in the inside of the slot 56.

[0040] The linkage component 6 includes a linkage groove 61 located on the top of the test bench 1. A linkage gear 62 is rotatably connected to the middle of the linkage groove 61 via a bearing. Inside the linkage groove 61 are two linkage rods 63 arranged symmetrically about the center of the linkage gear 62. The opposing surfaces of the two linkage rods 63 are respectively meshed and connected to the front and rear sides of the outer surface of the linkage gear 62. One end of the linkage rod 63 is away from the linkage gear 62, passes through the linkage groove 61, extends to the top of the test bench 1, and is fixedly connected to the front and rear sides of the bottom of a corresponding clamping plate 21. Due to the setting of the linkage gear 62, under the constraint of the linkage groove 61, the two linkage rods 63 can move synchronously relative to each other, thereby enabling the two clamping components 2 connected to them to move synchronously relative to each other. This achieves the goal that moving either clamping component 2 can cause the two clamping components 2 to slide synchronously and quickly relative to each other or in opposite directions, effectively improving the clamping or disassembly efficiency.

[0041] Inside the linkage groove 61, a sealing cover 64 is fitted from top to bottom above the linkage gear 62 and linkage rod 63. The top of the sealing cover 64 is flush with the top of the test bench 1. Two sliding cavities 65 are provided on the front and rear sides of the sealing cover 64, symmetrical about the axis of the linkage gear 62. One end of the linkage rod 63 passes through the sliding cavity 65 and extends to the top of the test bench 1. Due to the setting of the sealing cover 64, the linkage gear 62 and linkage rod 63 inside the linkage groove 61 can be protected. Moreover, with the cooperation of the sliding cavity 65, it can be ensured that one end of the linkage rod 63 can extend through the sliding cavity 65 to the top of the test bench 1 and connect with a corresponding clamping plate 21.

[0042] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A device for testing the pressure drop characteristics of a regulating valve, characterized in that: include: Test bench (1), the top of the test bench (1) is provided with two symmetrical clamping components (2), the top of the test bench (1) is provided with a valve body, the facing surfaces of the two clamping components (2) are close to each other and finally fit against the two ends of the valve body, the facing back surfaces of the two clamping components (2) are respectively connected to the air inlet (3) and the exhaust (4), the air inlet (3) and the exhaust (4) are connected to the two ends of the valve body through the clamping components (2); The clamping assembly (2) includes a clamping plate (21) slidably connected to the top of the test platform (1). The top of the test platform (1) is also slidably connected to two mating plates (22) located between the opposing surfaces of the two clamping plates (21). The two clamping plates (21) and the mating plates (22) correspond one-to-one. An injection head (23) is fixedly connected to the side of the clamping plate (21) closest to the mating plate (22). The mating plate (22) is sealed and fitted onto the outer surface of the injection head (23). The outer surface of the injection head (23) has an opening that fits against the mating plate (23). 22) Several air injection holes (24) on the inner side, and a return spring (25) is provided on the outside of the air injection head (23) to support the clamping plate (21) and the bonding plate (22). A limit rod (26) is movably sleeved inside the clamping plate (21). One end of the limit rod (26) is connected to the bonding plate (22). A connecting seat (27) is fixedly connected to the side of the clamping plate (21) away from the bonding plate (22). The air inlet (3) and the air outlet (4) are connected to the clamping plate (21) through the corresponding connecting seat (27).

2. The pressure drop characteristic testing device for a regulating valve according to claim 1, characterized in that: The bonding plate (22) slides along the outer surface of the air injection head (23) and eventually exposes the outer end of the air injection hole (24); the air injection head (23) is a cavity structure, and a number of air injection holes (24) are evenly distributed on the outer surface of the bonding plate (22). One end of the air injection hole (24) is connected to the air inlet end (3) and the air outlet end (4) through the air injection head (23) and the connecting seat (27), and the other end of the air injection hole (24) is connected to one end of the valve body.

3. The pressure drop characteristic testing device for a regulating valve according to claim 1, characterized in that: The limiting rod (26) is composed of a conical section and a cylindrical section. The cylindrical section is slidably sleeved inside the clamping plate (21). One end of the cylindrical section passes through the clamping plate (21) and is fixedly connected to the bonding plate (22). The other end of the cylindrical section passes through the clamping plate (21) and is connected to one end of the conical section. The outer diameter of the conical section near the clamping plate (21) is smaller than the outer diameter of its other end.

4. The pressure drop characteristic testing device for a regulating valve according to claim 3, characterized in that: The outer diameter of the air injection hole (24) is smaller than the thickness of the bonding plate (22). When the tapered section of the limiting rod (26) is fully attached to the clamping plate (21), the bonding plate (22) and the side of the air injection head (23) away from the clamping plate (21) are flush with each other. At this time, the outer end of the air injection hole (24) is completely sealed and attached to the inner side of the bonding plate (22).

5. The pressure drop characteristic testing device for a regulating valve according to claim 1, characterized in that: The test bench (1) is provided with a positioning component (5) located in the middle of the two clamping components (2) and below the valve body between them. The two ends of the positioning component (5) extend to both sides of the test bench (1). The upper ends of the two ends of the positioning component (5) extend to the top of the test bench (1) and are respectively connected to the bottom of the two clamping plates (21). The test bench (1) is also provided with a linkage component (6) located on the front and rear sides of the positioning component (5) and symmetrical to each other. The two ends of the linkage component (6) are connected to the front and rear ends of the two clamping plates (21). The bottom of the test bench (1) is provided with several supports (7). The outer surface of the supports (7) is rough.

6. The pressure drop characteristic testing device for a regulating valve according to claim 5, characterized in that: The positioning component (5) includes a slide groove (51) opened on the top of the test platform (1). Two sliders (52) are slidably engaged inside the slide groove (51). The inner wall of the slide groove (51) and the outer surface of the sliders (52) are smooth. The top of the sliders (52) passes through the slide groove (51) and extends to the top of the test platform (1), and is fixedly connected to the bottom of a corresponding clamping plate (21).

7. The pressure drop characteristic testing device for a regulating valve according to claim 6, characterized in that: A positioning rod (53) is inserted inside the slider (52). The outer surface of the positioning rod (53) and one side of the inner wall of the slider (52) are provided with helical teeth (54). The arc length of the arc surface where the helical teeth (54) are located is less than half of the circumference of the outer surface of the positioning rod (53) and the inner wall of the slider (52). The outer surface of the positioning rod (53) is connected to the inner wall of the slider (52) through the helical teeth (54).

8. The pressure drop characteristic testing device for a regulating valve according to claim 7, characterized in that: The two ends of the positioning rod (53) pass through the slider (52) and the groove (51) and extend to both sides of the test platform (1), and are fixedly connected with knobs (55). The two ends of the positioning rod (53) are rotatably connected to the two ends of the test platform (1) through bearings. The top of the slider (52) is provided with a slot (56), and the bottom of the bonding plate (22) is slidably engaged in the inside of the slot (56).

9. The pressure drop characteristic testing device for a regulating valve according to claim 5, characterized in that: The linkage assembly (6) includes a linkage groove (61) opened on the top of the test bench (1). A linkage gear (62) is rotatably connected to the middle of the linkage groove (61) via a bearing. Two linkage rods (63) are arranged inside the linkage groove (61) and are symmetrical about the center of the linkage gear (62). The opposing surfaces of the two linkage rods (63) are respectively meshed and connected to the front and rear sides of the outer surface of the linkage gear (62). One end of the linkage rod (63) is away from the linkage gear (62), and passes through the linkage groove (61) and extends to the top of the test bench (1), and is fixedly connected to the front and rear sides of the bottom of a corresponding clamping plate (21).

10. The pressure drop characteristic testing device for a regulating valve according to claim 9, characterized in that: The inside of the linkage groove (61) is fitted with a sealing cover (64) above the linkage gear (62) and linkage rod (63) from top to bottom. The top of the sealing cover (64) is flush with the top of the test bench (1). Two sliding cavities (65) are provided on the front and rear sides of the sealing cover (64) with respect to the axis of the linkage gear (62). One end of the linkage rod (63) passes through the sliding cavity (65) and extends to the top of the test bench (1).

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