Valve clack combined limiting structure suitable for small-caliber check valve

Abstract

The utility model relates to the technical field of valves, in particular to a valve clack combined limiting structure suitable for a small-caliber check valve. The left limiting block and the right limiting block are cast on the arc-shaped top face of a valve clack of the check valve and are adjacent, the protruding block is cast on the lower side face of a rocker of the check valve, and after the valve clack and the rocker are assembled in the check valve, the protruding block is located between the left limiting block and the right limiting block. The horizontal sections of the left limiting block and the right limiting block are approximately trapezoidal structures, the height is consistent with that of the first machining plane of the valve clack, and the top is designed to be oblique angles consistent with the lower side arc slope of the rocker. The height setting requirement is that the fit clearance with the valve clack is larger than the sum of the casting tolerance and the movable clearance of the valve clack, and the top is designed to be an oblique angle consistent with the circular arc slope of the top face of the valve clack. After the left limiting block, the right limiting block and the convex block are assembled, the contact surface is plane contact. The limiting device has the advantages that the limiting function is achieved without increasing the number of parts, and meanwhile negative effects on casting and machining are avoided.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve disc combination limiting structure suitable for small-diameter check valves. Background Technology

[0002] During the assembly of a check valve, the sealing pairs need to be ground and matched to ensure sealing performance after compression. If the valve disc undergoes significant rotational displacement during valve opening and closing, the original sealing pair assembly will fail. Therefore, a set of limiters is required to maintain the relative position between the valve body and the valve disc.

[0003] In the industry, the typical limit-positioning assembly uses two limit cylinders cast / welded onto the valve disc, clamped on both sides of the rocker arm connecting the valve disc for limiting movement. This structure has the following problems:

[0004] Question 1. Large-diameter check valves generally use a limiting cylinder cast on the valve disc, but the gap between the middle frustum of the small-diameter valve disc and the limiting cylinder is too small to be machined.

[0005] Question 2. Drilling holes in the valve disc after machining and welding the cylindrical pin to fix it is feasible, but on the one hand, it will increase the number of parts, and on the other hand, the complicated process is not economical for small-diameter valves. Utility Model Content

[0006] The main purpose of this utility model is to provide a valve disc combination limiting structure suitable for small-diameter check valves, so as to effectively solve the problems of difficult processing and numerous procedures for small-diameter check valves mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a valve disc assembly limiting structure suitable for small-diameter check valves, comprising a left limiting block and a right limiting block cast adjacent to the arc-shaped top surface of the check valve disc, and a protrusion cast on the lower side of the check valve rocker arm. After the valve disc and rocker arm are assembled inside the check valve, the protrusion is located between the left limiting block and the right limiting block.

[0008] Preferably, the horizontal cross-sections of the left and right limit blocks are approximately trapezoidal structures, with their heights matching the first machining plane of the valve disc, and their tops designed with an angle that matches the slope of the lower arc of the rocker arm.

[0009] Preferably, the horizontal cross-section of the protrusion on the lower side of the rocker arm is rectangular, and the height setting requirement is that the clearance between the rocker arm and the valve disc is greater than the sum of the casting tolerance and the valve disc movement clearance. The top is designed with an angle that matches the slope of the arc on the top surface of the valve disc.

[0010] Preferably, the contact surfaces of the left limiting block, the right limiting block and the protrusion after assembly should be planar contact.

[0011] The height of the left and right limit blocks on the valve disc is designed to be consistent with the first machining plane of the valve disc, so as to avoid the influence of the limit blocks on the machining of the water platform and ensure the maximum space utilization rate by meeting the requirements of the slope.

[0012] Combining the valve disc with the rocker arm ensures the valve disc's limiting function while making full use of existing space and avoiding manufacturing complexity and resource waste. This greatly facilitates the standardized production of small-diameter valves.

[0013] The beneficial effects of this utility model are that it achieves the limiting function without increasing the number of parts, and at the same time does not have a negative impact on casting and processing. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the three-dimensional structure of the valve disc of this utility model.

[0015] Appendix Figure 2 This is a three-dimensional structural diagram of the rocker arm of this utility model.

[0016] Appendix Figure 3 This is the main view of the valve disc and rocker assembly structure of this utility model.

[0017] Appendix Figure 4 This is a top view of the valve disc and rocker assembly structure of this utility model.

[0018] Appendix Figure 5 This is a cross-sectional view of the check valve structure according to an embodiment of this utility model.

[0019] Appendix Figure 1 —In part 5, valve disc 1, left limit block 2, right limit block 3, protrusion 4, rocker arm 5, and check valve 6. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Appendix Figure 1 As shown in Figure 5, a valve disc assembly limiting structure suitable for small-diameter check valves includes a left limiting block 2 and a right limiting block 3 cast adjacent to the arc-shaped top surface of the valve disc 1 of the check valve, and a protrusion 4 cast on the lower side of the rocker arm 5 of the check valve. After the valve disc 1 and the rocker arm 5 are assembled in the check valve 6, the protrusion 4 is located between the left limiting block 2 and the right limiting block 3.

[0022] The horizontal cross-sections of the left limit block 2 and the right limit block 3 are approximately trapezoidal structures, with their heights matching the first machining plane of the valve disc 1. The tops are designed with an angle that matches the slope of the lower arc of the rocker arm 5.

[0023] The horizontal cross-section of the protrusion 4 on the lower side of the rocker arm 5 is rectangular. The height setting requirement is that the clearance between the rocker arm and the valve disc is greater than the sum of the casting tolerance and the valve disc movement clearance. The top is designed with an angle that matches the slope of the arc on the top surface of the valve disc.

[0024] The contact surfaces of the left limiting block 2, right limiting block 3 and protrusion 4 after assembly should be planar contact.

[0025] The height of the left limiting block 2 and the right limiting block 3 on the valve disc is designed to be consistent with the first machining plane of the valve disc 1, so as to avoid the influence of the limiting blocks on the machining of the water platform and ensure the maximum space utilization rate in terms of slope requirements.

[0026] Combining the valve disc with the rocker arm ensures the valve disc's limiting function while making full use of existing space and avoiding manufacturing complexity and resource waste. This greatly facilitates the standardized production of small-diameter valves.

[0027] Beneficial effects: 1. Reduces the number of parts required for processing, thus reducing inventory and other overhead; 2. Avoids unnecessary processing steps (positioning, drilling, welding), reducing labor costs, and significantly saving time through mechanized production; 3. Achieving valve disc limiting will not negatively impact casting or processing.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A valve disc assembly limiting structure suitable for small-diameter check valves, characterized in that: It includes a left limiting block and a right limiting block cast adjacent to the arc-shaped top surface of the check valve disc, and a protrusion cast on the lower side of the check valve rocker arm. After the valve disc and rocker arm are assembled inside the check valve, the protrusion is located between the left limiting block and the right limiting block.

2. The valve disc assembly limiting structure suitable for small-diameter check valves according to claim 1, characterized in that: The horizontal cross-sections of the left and right limit blocks are approximately trapezoidal, with their heights matching the first machined plane of the valve disc. The tops are designed with an angle that matches the slope of the arc on the lower side of the rocker arm.

3. The valve disc assembly limiting structure suitable for small-diameter check valves according to claim 1, characterized in that: The horizontal cross-section of the protrusion on the lower side of the rocker arm is rectangular. The height setting requirement is that the clearance between the rocker arm and the valve disc is greater than the sum of the casting tolerance and the valve disc movement clearance. The top is designed with an angle that matches the slope of the arc on the top surface of the valve disc.

4. The valve disc combination limiting structure suitable for small-diameter check valves according to claim 1, characterized in that: The contact surfaces of the left and right limit blocks and the protrusions after assembly should be planar.

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