Low-temperature emergency cut-off valve with non-return structure

Abstract

The utility model discloses a low-temperature emergency cut-off valve with a non-return structure, relates to the field of low-temperature emergency cut-off valves, and aims to solve the problem that a pipeline welding connection non-return valve and the low-temperature emergency cut-off valve are material-consuming, time-consuming and labor-consuming. The rod body is located in the outer cavity, a sealing valve clack aligned with the through hole is fixedly arranged at the tail end of the rod body, and an integrated non-return mechanism aligned with the through hole is fixedly installed on the inner wall of the inner cavity, so that the effects that pipelines do not need to be welded, time and materials are saved, and internal media are prevented from flowing back through the double-sealing through hole are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of low temperature emergency cut-off valve, specifically to a low temperature emergency cut-off valve with check structure. BACKGROUND

[0002] Emergency cut-off valve is also called safety cut-off valve, which can be quickly closed or opened when encountering an emergency to avoid accidents. Emergency cut-off valve has excellent technical performance, low load loss and high reliability. It is suitable for flammable gases such as coal gas, natural gas and liquefied petroleum gas, and is widely used in low-temperature tank cars, tank containers, gas stations and low-temperature medium pipeline systems. At present, low-temperature emergency cut-off valves are needed to cooperate with check valves during low-temperature medium storage and transportation.

[0003] For example, Figure 1 The existing low-temperature emergency cut-off valve often needs to be specially welded with a pipeline for connection when used with a check valve.

[0004] The existing technical solution has the following defects: pipeline welding is time-consuming and laborious, and needs to be inspected after welding, so a high-integration valve with integrated check valve and low-temperature emergency cut-off valve is needed. INVENTION CONTENTS

[0005] The utility model aims at providing a low temperature emergency cut-off valve with check structure.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model discloses a cut-off valve body, the cut-off valve body is sequentially provided with upper cover, sleeve and valve body from top to bottom, the sleeve both ends are fixedly connected with upper cover and valve body setting, the sleeve is slidably wrapped with the rod body in the wall, the valve body is separated and is provided with the partition plate in the inside, the partition plate is divided and is provided with the inner chamber and the outer chamber, the partition plate is penetrated and is provided with the through -hole that communicates the inner chamber and the outer chamber, the rod body is located in the outer chamber and the end fixedly set up with the sealing valve flap that aligns the through -hole, the inner chamber wall is fixedly installed with the integrated check mechanism that aligns the through -hole.

[0008] By adopting the technical scheme, in actual use, the upper cover part is provided with a rotating handle or a special air hole, so that the rod body can be driven by the air pressure or the rotating handle, the cut-off valve body is generally used for filling liquefied petroleum gas or other canned transport medium, and in the use process, when the medium needs to be filled, the rod body is directly driven upward by the air pressure device or the rotating handle, so that the sealing valve disc is away from the through hole. Since the integrated check valve mechanism is a one-way flow structure, the medium injection is not hindered during filling. When the filling is completed, the integrated check valve mechanism can effectively seal the through hole under the pressure in the inner cavity to prevent the backflow of the internal medium. In combination with the sealing valve disc at the end of the rod body, the through hole on both sides can be effectively sealed, so that the integrated setting does not need to weld a pipeline, time and materials are saved, the through hole is double-sealed, and the overall sealing effect of the low-temperature emergency cut-off valve is effectively improved.

[0009] Further, the check valve mechanism includes a guide cylinder fixedly arranged on the inner wall of the inner cavity, the guide cylinder is arranged in alignment with the sealing valve disc at the end of the through hole, a check valve disc is slidably arranged in the guide cylinder in alignment with the through hole, and a sliding cylinder sliding along the guide cylinder is fixedly arranged at one end of the check valve disc close to the guide cylinder.

[0010] By adopting the technical scheme, during the filling process, the sealing valve disc on one side of the through hole is already in an open state, and the pressure in the outer cavity is greater than that in the inner cavity. Under the action of the pressure difference between the inner cavity and the outer cavity, the check valve disc is also away from the through hole, and the through hole on both sides is smoothly opened, so that the medium flows, and the filling is smoothly completed. After the filling is stopped, the pressure in the outer cavity gradually decreases, and the pressure in the inner cavity slowly exceeds that in the outer cavity. At this time, the check valve disc is continuously close to the through hole under the action of the medium flow, and then tightly seals the through hole under the action of the pressure in the inner cavity, so that the backflow of the medium is prevented.

[0011] Further, the sliding cylinder is internally provided with a compression spring fixedly connected with the check valve disc.

[0012] By adopting the technical scheme, the compression spring always applies a pressure to the sliding cylinder towards the through hole, so that the check valve disc can be effectively driven to be close to the through hole after the filling operation is completed. Compared with the operation of simply relying on the medium flow to drive the check valve disc to be close to the through hole for backflow sealing, the backflow time is shorter, and the loss of the medium is smaller. When the medium content in the inner cavity is small and the pressure is low, the check valve disc can also effectively seal the through hole, and has good working stability.

[0013] Further, one side of the sealing valve disc and the check valve disc close to the through hole is provided with a sealing groove, the sealing groove is filled with a sealing ring, and the outer wall of the through hole on both sides is fixedly provided with a sealing convex ring in abutment with the sealing ring.

[0014] By adopting the technical scheme, the sealing ring is generally made of elastic material, the sealing groove is convenient for arrangement of the sealing ring, and the sealing convex ring tightly abuts against the sealing ring to make the sealing ring deformed to completely fill the gap between the sealing groove and the sealing convex ring in the closed state of the valve, thereby improving the sealing performance of the sealing valve disc.

[0015] In conclusion, the beneficial technical effects of the utility model are as follows:

[0016] 1. The integrated check mechanism, guide cylinder and check valve disc are integrated without the need of welding pipeline, thereby saving time and material and improving the overall sealing effect of the low-temperature emergency shut-off valve.

[0017] 2. The compression spring is adopted, the check time is shorter, the medium loss is smaller, and the check valve disc can effectively seal the through hole when the medium content in the inner cavity is small and the pressure is low, thereby having good working stability.

[0018] 3. The sealing convex ring, sealing ring and sealing groove are adopted, thereby further improving the sealing performance of the through hole by the valve discs on both sides of the through hole. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the utility model and constitute a part of the specification, and do not constitute a limitation on the utility model. In the drawings:

[0020] Figure 1 is a schematic view of an existing valve structure;

[0021] Figure 2 is a schematic view of the overall structure of the utility model;

[0022] Figure 3 is a schematic view of the overall structure of the utility model;

[0023] Figure 4 is an enlarged schematic view of the valve body structure in the utility model.

[0024] In the drawings, 1 is an upper cover, 2 is a sleeve, 3 is a valve body, 31 is a partition plate, 32 is an inner cavity, 33 is an outer cavity, 34 is a through hole, 4 is a rod body, 41 is a sealing valve disc, 5 is an integrated check mechanism, 51 is a guide cylinder, 52 is a check valve disc, 53 is a sliding cylinder, 55 is a compression spring, 6 is a sealing convex ring, 61 is a sealing groove, and 62 is a sealing ring. DETAILED DESCRIPTION

[0025] The utility model will be further described in detail below in combination with the drawings.

[0026] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0027] Please refer to Figures 1-4 The present application provides the technical solutions:

[0028] The cut-off valve body is sequentially provided with an upper cover 1, a sleeve 2 and a valve body 3 from top to bottom, the sleeve 2 is fixedly connected with the upper cover 1 and the valve body 3 at both ends, the sleeve 2 is slidingly wrapped with a rod body 4, the valve body 3 is internally partitioned with a partition plate 31, the partition plate 31 divides the valve body 3 into an inner cavity 32 and an outer cavity 33, the partition plate 31 is provided with a through hole 34 penetratingly formed and communicating the inner cavity 32 and the outer cavity 33, the rod body 4 is located in the outer cavity 33 and fixedly provided at the end with a sealing valve flap 41 aligned with the through hole 34, an integrated check mechanism 5 aligned with the through hole 34 is fixedly installed on the inner wall of the inner cavity 32, in actual use, the upper cover 1 is provided with a rotating handle or a special gas hole, so that the rod body 4 can be driven by the pneumatic device or the rotating handle, the cut-off valve body is generally used for filling liquefied petroleum gas or other canned transportation medium, in the use process, when the medium needs to be filled, the pneumatic device or the rotating handle is directly controlled to drive the rod body 4 to move upward, so that the sealing valve flap 41 is away from the through hole 34, since the integrated check mechanism 5 is a one-way flow structure, the medium injection will not be hindered during filling, and when the filling is completed, the integrated check mechanism 5 can effectively seal the through hole 34 under the pressure in the inner cavity 32, so as to prevent the backflow of the internal medium, in combination with the sealing valve flap 41 at the end of the rod body 4, the two sides of the through hole 34 can be effectively sealed, so as to achieve the integrated setting without welding pipeline, save time and materials, double seal the through hole 34, and effectively improve the overall sealing effect of the low-temperature emergency cut-off valve.

[0029] The check valve mechanism includes a guide cylinder 51 fixedly installed on the inner wall of the inner cavity 32. The end of the guide cylinder 51 is aligned with the sealing valve disc 41 at a distance from the through hole 34. The middle of the guide cylinder 51 is slidably equipped with a check valve disc 52 aligned with the through hole 34. A sliding cylinder 53 is fixedly installed at the end of the check valve disc 52 near the guide cylinder 51 and slides along the guide cylinder 51. During the filling process, the sealing valve disc 41 on one side of the through hole 34 is already in the open state, and the pressure in the outer cavity 33 is greater than the pressure in the inner cavity 32. Under the action of the pressure difference between the inside and outside, the check valve disc 52 also moves away from the through hole 34. Both sides of the through hole 34 are opened smoothly, which facilitates the flow of the medium and achieves the effect of smooth filling. After the filling stops, the pressure in the outer cavity 33 gradually decreases, and the pressure in the inner cavity 32 slowly exceeds the pressure in the outer cavity 33. At this time, the check valve disc 52 is driven by the medium flow to continuously approach the through hole 34, and then tightly seals the through hole 34 under the action of the pressure in the inner cavity 32, thereby preventing the medium from flowing back.

[0030] The sliding cylinder 53 has a built-in compression spring 55 that is fixedly connected to the check valve disc 52. The compression spring 55 always applies a pressure toward the through hole 34 to the sliding cylinder 53. After the filling operation is completed, it can effectively drive the check valve disc 52 closer to the through hole 34. Compared with the operation of simply relying on the flow of the medium to drive the check valve disc 52 closer to the through hole 34 for check sealing, the check time is shorter and the amount of medium loss is smaller. When the medium content in the inner cavity 32 is small and the pressure is low, it can also ensure that the check valve disc 52 effectively seals the through hole 34, and has good working stability.

[0031] A sealing groove 61 is provided on the side of the sealing valve disc 41 and the check valve disc 52 near the through hole 34. The sealing groove 61 is filled with a sealing ring 62. Sealing protrusions 6 are fixedly provided on the outer walls of both sides of the through hole 34 to cooperate with and abut against the sealing ring 62. The sealing ring 62 is generally made of elastic material. The sealing groove 61 facilitates the placement of the sealing ring 62. When the valve is closed, the sealing protrusions 6 firmly abut against the sealing ring 62, causing it to deform and completely fill the gap between the sealing groove 61 and the sealing protrusions 6, thereby improving the sealing performance of the sealing valve disc 41.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. A low-temperature emergency shut-off valve with a check structure, comprising, from top to bottom, an upper cover (1), a sleeve (2) and a valve body (3), characterized in that: The sleeve (2) is fixedly connected with the upper cover (1) and the valve body (3) at both ends, the sleeve (2) is slidably wrapped with the inner wall of the rod body (4), the valve body (3) is divided into the inner cavity (32) and the outer cavity (33) by the partition plate (31), the partition plate (31) is provided with the through hole (34) penetrating through the partition plate (31) and connecting the inner cavity (32) and the outer cavity (33), the rod body (4) is located in the outer cavity (33) and the sealing valve (41) is fixedly arranged at the end of the rod body (4) and aligned with the through hole (34), and the integrated check mechanism (5) is fixedly installed on the inner wall of the inner cavity (32) and aligned with the through hole (34).

2. A cryogenic emergency shut-off valve with non-return structure according to claim 1, characterized in that: The check mechanism includes the guide cylinder (51) fixedly arranged on the inner wall of the inner cavity (32), the guide cylinder (51) is arranged at the end of the guide cylinder (51) and aligned with the sealing valve (41) through the through hole (34), the check valve (52) is slidably arranged in the guide cylinder (51) and aligned with the through hole (34), and the check valve (52) is fixedly arranged at one end of the check valve (52) close to the guide cylinder (51) and the sliding cylinder (53) is arranged along the guide cylinder (51).

3. A cryogenic emergency shut-off valve with non-return structure according to claim 2, characterized in that: The sliding cylinder (53) is provided with the compression spring (55) fixedly connected with the check valve.

4. A cryogenic emergency shut-off valve with non-return structure according to claim 3, characterized in that: The sealing groove (61) is arranged on one side of the sealing valve (41) and the check valve (52) close to the through hole (34), the sealing groove (61) is filled with the sealing ring (62), and the sealing convex ring (6) is fixedly arranged on the outer wall of the through hole (34) and abuts against the sealing ring (62).

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