Stop valve

Abstract

The stop valve comprises a valve body, the two ends of the valve body are communicated with an inner cavity of the valve body, and a positioning table is formed at the joint of a large-diameter cavity and a small-diameter cavity of the valve body; an outer hexagonal structure, a large-diameter end connecting structure and a small-diameter end connecting structure are arranged on the outer wall of the valve body; a valve element is installed in the valve body, a spring is arranged between the valve element and the positioning table, the valve element comprises a sliding sleeve part and a core rod part, the core rod part is located in the center of the sliding sleeve part, and a hollow structure is arranged on the sliding sleeve and located on the periphery of the core rod part. The core rod part comprises a main body section and a conical section, a liquid passing hole is formed in the conical section, a conical surface part is arranged on the conical section, and a baffle piece is arranged at an opening of the large-diameter cavity of the valve body. According to the invention, the valve core composed of the core rod part and the sliding sleeve part is used as an independent part and is convenient to assemble, and when oil flows from the large-diameter cavity to the small-diameter cavity, if the pressure of an external pipeline of the small-diameter cavity is suddenly relieved, the conical surface part of the valve core and the valve body are tightly pressed, so that a large amount of oil is prevented from passing through, small-flow oil is allowed to pass through, and a safety protection effect is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic valves, and particularly relates to a cut-off valve. BACKGROUND

[0002] The safety valve is an important part of the oil cylinder of the lifting equipment, and is mainly used for avoiding uncontrollable descent of the oil cylinder when the oil pipe suddenly bursts to prevent safety accidents. However, the existing safety cut-off valve mainly adopts a valve body with different inner diameter cavity sections, and a combined valve core part is arranged in the valve body. The valve body and the valve core are difficult to manufacture, the machining precision is not good, the internal parts are not easy to assemble, the spring for controlling the action of the valve core is prone to be stuck, and the conventional one-way valve as the safety valve can only cut off the oil passage connected with the oil cylinder when the oil pipe suddenly bursts, so that the oil cylinder stops immediately, and the lifting equipment may lift the goods in the air and cannot be conveniently unloaded. Therefore, the existing cut-off valve needs to be optimized and designed. SUMMARY

[0003] Therefore, the application aims to overcome the defects in the prior art, and provides a cut-off valve which is low in processing difficulty, convenient to assemble, can block a large amount of oil when the oil pipe suddenly bursts, and allows small-flow oil to pass, thereby effectively playing a safety protection role.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0005] The cut-off valve comprises a valve body, both ends of the valve body are in communication with an inner cavity of the valve body, a positioning table is formed at a joint between a large-diameter cavity and a small-diameter cavity of the valve body, and the positioning table is provided with a chamfer; an outer hexagonal structure is arranged on the outer wall of the valve body, a large-diameter end connecting structure and a small-diameter end connecting structure are respectively arranged on both sides of the outer hexagonal structure; a valve core is arranged in the valve body, a spring is arranged between the valve core and the positioning table, the valve core comprises a sliding sleeve part and a core rod part, the core rod part is arranged at the center of the sliding sleeve part, and a hollow structure is arranged on the sliding sleeve part at a position outside the core rod part; the core rod part comprises a main body section and a tapered section arranged at the free end of the main body section, a liquid passing hole for connecting the large-diameter cavity and the small-diameter cavity is arranged on the tapered section, a tapered surface part matched with the chamfer on the positioning table is arranged on the tapered section, and a blocking piece is arranged at the opening of the large-diameter cavity of the valve body.

[0006] Further, the liquid inlet of the liquid passing hole is arranged close to the joint between the tapered section and the main body section, and the liquid outlet of the liquid passing hole is arranged at the center of the core rod part.

[0007] Further, a first groove is arranged at the joint between the large-diameter end connecting structure and the outer hexagonal structure, and a first sealing ring is arranged in the first groove.

[0008] Further, a second groove is arranged at the joint between the small-diameter end connecting structure and the outer hexagonal structure, and a second sealing ring is arranged in the second groove.

[0009] Further, the large-diameter end connecting structure and the small-diameter end connecting structure are both external thread structures.

[0010] Further, the valve body inner wall is provided with a finish section matched with the spool, and the length of the finish section is 1 / 2-1 / 2 of the total length of the valve body.

[0011] Further, the external diameter of the large-diameter end connecting structure is smaller than that of the small-diameter end connecting structure.

[0012] Further, the barrier piece is an elastic hole retainer.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] The valve core composed of the core rod part and the spool part is an independent part and can be conveniently installed in the valve body. When the oil flows from the small-diameter cavity to the large-diameter cavity, the valve core does not work. When the oil flows from the large-diameter cavity to the small-diameter cavity, the pressure difference between the small-diameter cavity and the large-diameter cavity suddenly increases to overcome the spring force and push the valve core to move to the small-diameter cavity side. The valve core conical surface part is pressed against the valve body to cut off the oil in the pipeline and only leave a small hole in the valve core to block the large flow of oil while allowing the small flow of oil to pass, effectively playing a safety protection role. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and serve as an aid in explaining the present application. The schematic embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0016] Fig. 1 It is a structural schematic diagram of the present application;

[0017] Fig. 2 It is a structural schematic diagram of the valve body part in the present application;

[0018] Fig. 3 It is a structural schematic diagram of the valve core part in the present application;

[0019] Fig. 4 It is a schematic diagram of the core rod part of the valve core in the present application. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., 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, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] A shut-off valve, such as Figs. 1 to 4 As shown, the valve includes a valve body 1, with both ends communicating with the internal cavity of the valve body. A positioning platform 4 is formed at the junction of the large-diameter cavity 2 and the small-diameter cavity 3. The positioning platform has a chamfer, which is used to cooperate with the valve core to cut off the oil flow in the pipeline. The outer wall of the valve body has an external hexagonal structure 6, and on both sides of the external hexagonal structure are a large-diameter end connection structure 7 and a small-diameter end connection structure 8, respectively. The external hexagonal structure allows for easy screwing of the shut-off valve, or it can be fixed with clamps for easy connection to pipelines or valve blocks. A valve core is installed inside the valve body, and a spring 9 is provided between the valve core and the positioning platform.

[0025] The valve core includes a sliding sleeve portion 10 and a core rod portion 11. The core rod portion is located at the center of the sliding sleeve portion. A hollow structure 12 is provided on the sliding sleeve at the periphery of the core rod portion. While the core rod portion is connected and fixed to the sliding sleeve, it can also ensure that the oil passes through the sliding sleeve portion. The core rod portion includes a main body section 13 and a conical section 14 at the free end of the main body section. The conical section facing the sliding sleeve has a larger surface area, that is, a larger surface area to withstand oil pressure. The valve core has a lower starting pressure and can be more sensitive to changes in oil pressure at the moment of oil pipe rupture, and the valve core has a faster response speed.

[0026] The conical section is provided with a liquid passing hole 15 for connecting the large-diameter cavity and the small-diameter cavity, and is provided with a conical surface part 16 matched with the chamfer on the positioning platform, and the large-diameter cavity of the valve body is provided with a blocking part 5. As an example, the blocking part is an elastic blocking ring for hole, which can limit the sliding sleeve part of the valve core and ensure that the valve core is always kept in the valve body.

[0027] The liquid inlet 17 of the liquid passing hole (towards the sliding sleeve side) is arranged near the joint of the conical section and the main body section, and the liquid outlet 18 of the liquid passing hole (away from the sliding sleeve side) is at the center of the core rod part. It should be noted that the oil liquid inlet direction of the liquid inlet and the oil liquid outlet direction of the liquid outlet are both according to the oil liquid movement direction when the valve core plays a role of cutting off the pipeline oil liquid. In the present application, only the part matched with the sliding sleeve of the inner wall of the valve body needs to be provided with a finish machining section, and the length of the finish machining section only needs to be 1 / 2-1 / 2 of the total length of the valve body, thereby reducing the machining difficulty of the valve body.

[0028] Generally, the large-diameter end connecting structure and the small-diameter end connecting structure both adopt external thread structures. The external diameter of the large-diameter end connecting structure is smaller than that of the small-diameter end connecting structure. The large-diameter end connecting structure is provided with a first groove at the joint with the external hexagonal structure, and a first sealing ring 19 is installed in the first groove. The small-diameter end connecting structure is provided with a second groove at the joint with the external hexagonal structure, and a second sealing ring 20 is installed in the second groove.

[0029] The present application has reasonable structure, the valve core composed of the core rod part and the sliding sleeve part can be conveniently installed in the valve body, and when the oil liquid flows from the small-diameter cavity to the large-diameter cavity, it is equivalent to a passage, and the valve core does not play a role. When the oil liquid flows from the large-diameter cavity to the small-diameter cavity, when the pipeline connected with the small-diameter cavity suddenly unloads (such as pipe explosion), the pressure difference between the two sides of the small-diameter cavity and the large-diameter cavity suddenly becomes large, the spring force is overcome to push the valve core to move to the small-diameter cavity side, the conical surface part of the valve core is pressed against the valve body (the positioning platform thereon), the pipeline oil liquid is cut off, and only a small hole of the valve core is left, which blocks the passage of a large amount of oil liquid while allowing the passage of a small amount of oil liquid, effectively playing a safety protection role, that is, in specific application, when the oil pipe suddenly bursts, the present cut-off valve can cut off the oil path connected with the oil cylinder, allow a small amount of oil liquid to pass through the cut-off valve through the liquid passing hole, and the oil cylinder slowly retracts, so that the lifting equipment slowly falls down when lifting the goods in the air, thereby greatly improving the safety.

[0030] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A shut-off valve, characterized in that: The valve body includes a valve body with both ends communicating with the inner cavity of the valve body. A positioning platform is formed at the junction of the large-diameter cavity and the small-diameter cavity, and the positioning platform has a chamfer. The outer wall of the valve body has an external hexagonal structure, and a large-diameter end connection structure and a small-diameter end connection structure are respectively provided on both sides of the external hexagonal structure on the outer wall of the valve body. A valve core is installed in the valve body, and a spring is provided between the valve core and the positioning platform. The valve core includes a sliding sleeve part and a core rod part. The core rod part is located at the center of the sliding sleeve part, and a hollow structure is provided on the sliding sleeve at the periphery of the core rod part. The core rod part includes a main body section and a conical section at the free end of the main body section. The conical section has a liquid passage hole for connecting the large-diameter cavity and the small-diameter cavity. The conical section has a conical surface that matches the chamfer on the positioning platform. A baffle is provided at the opening of the large-diameter cavity of the valve body.

2. A shut-off valve according to claim 1, characterized in that: The liquid inlet of the liquid passage is located near the junction of the conical section and the main body section, and the liquid outlet of the liquid passage is located at the center of the core rod.

3. A shut-off valve according to claim 1, characterized in that: The large-diameter end connection structure is provided with a first groove at the junction with the external hexagonal structure, and a first sealing ring is installed in the first groove.

4. A shut-off valve according to claim 1, characterized in that: A second groove is provided at the junction of the small-diameter end connection structure and the external hexagonal structure, and a second sealing ring is installed in the second groove.

5. A shut-off valve according to claim 1, characterized in that: Both the large-diameter end connection structure and the small-diameter end connection structure adopt an external thread structure.

6. A shut-off valve according to claim 1, characterized in that: The inner wall of the valve body is provided with a precision-machined section that mates with the sliding sleeve. The length of the precision-machined section is 1 / 2 to 1 / 2 of the total length of the valve body.

7. A shut-off valve according to claim 1, characterized in that: The outer diameter of the large-diameter end connection structure is smaller than the outer diameter of the small-diameter end connection structure.

8. A shut-off valve according to claim 1, characterized in that: The partition is a perforated elastic retaining ring.

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