Axial-flow type stop check valve

Abstract

The invention designs an axial flow type stop check valve which comprises a valve body, a support, an anti-rotation cover, a large gear, a thrust roller pin assembly, a rod nut, a positioning sleeve, a valve rod, an end cover, a flow guide sleeve, a spring, a valve clack, a driving rod gear and the like, and is characterized in that the neck height of the valve body is reduced, and the rotary motion of the driving rod gear is converted into the linear motion of the valve rod; the overall height of the valve is reduced to the maximum extent; and the valve upper maintenance space is reduced. The valve rod is matched with the valve clack and the rectangular groove of the anti-rotation cover through keys, so that the movement track of the valve clack is unique, abrasion between the valve clack and the valve body is prevented from being aggravated due to self-rotation in the opening and closing process, and the service life of a sealing face is prolonged. A thrust roller pin assembly is arranged between the large gear and the friction face of the support, abrasion caused by rotation is reduced, and the service life of the gear is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of axial flow check valves, and in particular to an axial flow stop check valve. Background Art

[0002] As a type of valve that plays a key role in the pipeline system, the axial flow stop check valve works according to the size and direction of the medium flow to achieve the opening and closing control of the valve. It is a kind of self-controlled valve. In the current common valve design, the structure of the stop check valve is mostly straight-through. This straight-through structure has some obvious disadvantages. First of all, the distance between its end flanges is relatively large, which directly leads to the increase of the overall height of the valve. The increase in the height of the valve further increases the structural package size of the entire valve, and the corresponding weight will also increase. In actual application scenarios, this will bring many inconveniences. For example, in some installation environments with limited space, the oversized size may make installation difficult or even impossible. Moreover, the larger structural package size and weight will also cause certain troubles in transportation and handling, increasing the relevant costs and difficulties.

[0003] In addition, since the disc and the valve body sealing contact surface will constantly interact during the long-term use of the valve, and this rotational wear is more prominent in the straight-through structure, long-term rotational wear will significantly shorten the service life of the sealing surface. As the wear of the sealing surface intensifies, the sealing performance gradually decreases, and eventually internal leakage will occur. Internal leakage will not only affect the normal working efficiency of the valve, but may also cause medium leakage, polluting the surrounding environment, and even in the case of some special media, it may cause safety accidents, bringing potential risks and hazards to production and life. Summary of the invention

[0004] Based on the above-mentioned technical problems that the traditional stop check valve has a large end flange spacing and a high valve height, which will make the structural packaging size and weight larger, the maintenance space limited, and the valve flap and the valve body sealing contact surface will be subjected to long-term rotational wear, which will shorten the service life of the sealing surface and cause internal leakage, an axial flow stop check valve is provided. The present invention optimizes the structure of the drive rod gear and the large gear, and the valve stem is assembled horizontally to reduce the overall height of the valve; the valve flap and the valve stem are designed with grooves, and after being installed with keys, the valve flap can be prevented from rotating itself during the opening and closing process, increasing the wear time with the valve body and extending the service life of the sealing surface. By placing a thrust needle roller assembly, wear is reduced and the service life of the gear is increased.

[0005] The technical means adopted by the present invention are as follows:

[0006] An axial flow stop check valve, comprising: a valve body, a bracket, an anti-rotation cover, a large gear, a thrust needle roller assembly, a rod nut, a positioning sleeve, a valve stem, an end cover, a guide sleeve, a spring, a valve disc, and a drive rod gear;

[0007] The bracket and the valve body are connected by threads and then tightened by welding;

[0008] The anti-rotation cover is embedded in the left end of the bracket and fixed by bolts, the large gear is embedded in the left end of the bracket, and the thrust needle roller assembly is placed in the gap of the friction surface;

[0009] The spline at the right end of the nut is placed in cooperation with the spline inside the large gear, the positioning sleeve is inserted into the protruding shaft position on the left side of the nut, the valve stem is inserted into the positioning sleeve through the spline cooperation, and the right side is limited by the anti-rotation cover through the key cooperation.

[0010] Furthermore, the end cover is embedded in the positioning sleeve and fixed by welding, and the guide sleeve is screwed into the left end of the bracket through threads and fixed by welding.

[0011] Furthermore, a spring is inserted into the protruding shaft position on the right side of the valve disc, and a key is used to cooperate with the left end of the valve stem to limit the position, so as to adjust the position of the valve disc so that it reaches the optimal position with the sealing surface of the valve body.

[0012] Furthermore, the drive rod gear penetrates into the valve body, and the lower end gear is assembled with the large gear. The large gear is driven to rotate by rotating the drive rod gear, thereby driving the linear motion of the valve stem and the valve disc, so as to reduce the height of the valve body neck, minimize the overall height of the valve, and reduce the installation and use space of the valve.

[0013] Furthermore, grooves are processed on the valve disc and the valve stem, and the grooves are installed by key cooperation to fix the valve disc circumferentially so that the movement trajectory of the valve disc is unique. The rectangular grooves of the valve stem, the valve disc and the anti-rotation cover are key-coordinated to control the smoothness of the contact surface of the relative running parts, thereby controlling the valve stem to make a straight and smooth movement.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. An axial flow stop check valve provided by the present invention places a thrust needle roller assembly in the gap between the friction surface of the large gear and the bracket, which greatly reduces the wear caused by the rotation of the gear. The thrust needle roller assembly can provide good rolling support and lubrication when the large gear rotates, reduces the friction coefficient, and reduces the generation of friction heat, thereby effectively extending the service life of the large gear. This not only reduces the frequency of valve maintenance and component replacement, reduces maintenance costs, but also ensures the stability of the transmission performance of the valve during long-term use, and ensures that the valve can continuously and accurately control the flow of the medium.

[0016] 2. The axial flow stop check valve provided by the present invention has grooves machined on the valve disc and the valve stem and is installed by key matching, so that the valve disc is fixed circumferentially, and the movement trajectory of the valve disc is unique. This design avoids unnecessary wear of the valve disc and the valve body sealing pair due to its own rotation during the opening and closing process. The service life of the sealing surface is extended, the internal leakage problem caused by the wear of the sealing surface is reduced, and the sealing performance and working reliability of the valve are improved. At the same time, the cost and maintenance workload of frequent replacement of seals due to sealing failure are also reduced.

[0017] 3. The axial flow stop check valve provided by the present invention converts the rotational motion of the drive rod gear into the linear motion of the valve stem by modifying the structure of the drive rod gear and the large gear, thereby reducing the height of the valve body neck and the overall height of the valve to the maximum extent. This design requires less space for the valve to be installed, and is particularly suitable for places with limited space, such as some narrow pipe wells or equipment rooms. The valve can be installed more conveniently without changing the pipeline layout, which improves the flexibility and adaptability of the installation and also leaves more space for the layout of other equipment or pipelines.

[0018] 4. The axial flow stop check valve provided by the present invention has an optimized design of the overall structure of the valve, which enables maintenance personnel to more conveniently approach various components during maintenance. The reduced valve body neck height and reasonable component layout provide more space for the operation of maintenance tools, making it convenient for maintenance personnel to perform maintenance work such as disassembly and replacement of components. The maintenance time and difficulty are reduced, the maintenance efficiency is improved, and the equipment downtime caused by maintenance is reduced, thereby improving production efficiency and economic benefits.

[0019] Based on the above reasons, the present invention can be widely promoted in the technical field of axial flow check valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of an axial flow stop check valve in a fully open state according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic structural diagram of an axial flow stop check valve in a fully closed state in an embodiment of the present invention;

[0023] Figure 3It is a schematic diagram of the manual closing structure of an axial flow stop check valve in an embodiment of the present invention.

[0024] In the figure: 1. valve body; 2. bracket; 3. anti-rotation cover; 4. large gear; 5. thrust needle roller assembly; 6. rod nut; 7. positioning sleeve; 8. valve stem; 9. end cover; 10. guide sleeve; 11. spring; 12. valve disc; 13. drive rod gear. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] like Figures 1 to 2 As shown, an axial flow stop check valve comprises: a valve body 1, a bracket 2, an anti-rotation cover 3, a large gear 4, a thrust needle roller assembly 5, a rod nut 6, a positioning sleeve 7, a valve stem 8, an end cover 9, a guide sleeve 10, a spring 11, a valve disc 12, and a drive rod gear 13;

[0033] The bracket 2 is connected to the valve body 1 by threaded connection and then welded and fixed;

[0034] The anti-rotation cover 3 is embedded in the left end of the bracket 2 and fixed by bolts, the large gear 4 is embedded in the left end of the bracket 2, and the thrust needle roller assembly 5 is placed in the friction surface gap;

[0035] The spline at the right end of the rod nut 6 is placed in cooperation with the spline inside the large gear 4, the positioning sleeve 7 is inserted into the protruding shaft position on the left side of the rod nut 6, the valve stem 8 is inserted into the positioning sleeve 7 through the spline cooperation, and the right side is limited by the anti-rotation cover 3 through the key cooperation.

[0036] Furthermore, the end cover 9 is embedded in the positioning sleeve 7 and fixed by welding, and the guide sleeve 10 is screwed into the left end of the bracket 2 by means of threads and fixed by welding.

[0037] Furthermore, the spring 11 is inserted into the protruding shaft position on the right side of the valve flap 12, and the position of the valve flap 12 is adjusted to reach the optimal position with the sealing surface of the valve body 1 through a key to limit the position with the left end of the valve stem 8.

[0038] Furthermore, the driving rod gear 13 penetrates into the valve body 1, and the lower end gear is assembled with the large gear 4. The large gear 4 is driven to rotate by rotating the driving rod gear 13, thereby driving the linear motion of the valve stem 8 and the valve disc 12, so as to reduce the neck height of the valve body 1, minimize the overall height of the valve, and reduce the installation and use space of the valve.

[0039] like Figure 2 As shown, in the initial stage of valve closing, the valve disc 12 accelerates toward the valve body 1 under the combined action of the spring 11 force and the medium force, so that the valve disc 12 can be quickly closed and the damage to the upstream pipeline caused by the large amount of medium backflow can be reduced. Grooves are processed on the anti-rotation cover 3, the valve stem 8, and the valve disc 12. The grooves are installed by key matching to fix the valve disc 12 circumferentially so that the movement trajectory of the valve disc 12 always falls within the lead of the valve stem 8, thereby preventing the valve disc 12 from rotating itself during the opening and closing process, increasing the wear time with the valve body 1, extending the service life of the sealing surface, and improving the valve sealing performance.

[0040] Furthermore, grooves are machined on the valve disc 12 and the valve stem 8, and the grooves are installed by key cooperation to fix the valve disc 12 circumferentially so that the movement trajectory of the valve disc 12 is unique. The valve stem 8 and the valve disc 12 and the rectangular groove of the anti-rotation cover 3 are key-coordinated to control the smoothness of the contact surface of the relative running parts, thereby controlling the valve stem 8 to make a straight and smooth movement.

[0041] like Figure 3 As shown, in the stage of manually closing the valve, the hand wheel is turned counterclockwise, the driving rod gear 13 drives the large gear 4 and the rod nut 6 to rotate, and the valve stem 8 moves toward the valve disc 12. The valve disc 12 realizes the slow closing function under the joint action of the spring 11 and the valve stem 8. The friction surface between the large gear 4 and the bracket 2 is lubricated by the thrust needle roller assembly 5, which reduces the wear caused by rotation and improves the service life of the gear.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An axial flow stop check valve, characterized in that: include: Valve body, bracket, anti-rotation cover, large gear, thrust needle roller assembly, rod nut, positioning sleeve, valve stem, end cover, guide sleeve, spring, valve disc, drive rod gear; The bracket and the valve body are connected by threads and then tightened by welding; The anti-rotation cover is embedded in the left end of the bracket and fixed by bolts, the large gear is embedded in the left end of the bracket, and the thrust needle roller assembly is placed in the gap of the friction surface; The spline at the right end of the nut is placed in cooperation with the spline inside the large gear, the positioning sleeve is inserted into the protruding shaft position on the left side of the nut, the valve stem is inserted into the positioning sleeve through the spline cooperation, and the right side is limited by the anti-rotation cover through the key cooperation.

2. An axial flow stop check valve according to claim 1, characterized in that: The end cover is embedded in the positioning sleeve and fixed by welding, and the guide sleeve is screwed into the left end of the bracket through threads and fixed by welding.

3. The axial flow stop check valve according to claim 1, characterized in that: A spring is inserted into the protruding shaft position on the right side of the valve disc, and a key is used to cooperate with the left end of the valve stem to limit the position, so as to adjust the position of the valve disc so that it reaches the optimal position with the sealing surface of the valve body.

4. The axial flow stop check valve according to claim 1, characterized in that: The drive rod gear penetrates into the valve body, and the lower end gear is assembled with the large gear. The large gear is driven to rotate by rotating the drive rod gear, thereby driving the valve stem and the valve disc to move linearly, so as to reduce the height of the valve body neck, minimize the overall height of the valve, and reduce the installation and use space of the valve.

5. The axial flow stop check valve according to claim 1, characterized in that: Grooves are machined on the valve disc and the valve stem, and the grooves are installed by key cooperation to fix the valve disc circumferentially so that the movement trajectory of the valve disc is unique. The rectangular grooves of the valve stem, the valve disc and the anti-rotation cover are key-coordinated to control the smoothness of the contact surface of the relative running parts, thereby controlling the valve stem to move in a straight line and smoothly.

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