Middle opening sealing structure for emergency cut-off valve

Abstract

The utility model relates to the technical field of emergency cut-off valves, and provides a middle opening sealing structure for an emergency cut-off valve, which comprises a valve body provided with an inner cavity, and a valve shaft rotatably arranged in the inner cavity and used for controlling a valve core to block or cancel blocking of the valve body; the first movable disc slidably sleeves the valve shaft and is positioned at one end, far away from the valve core, of the inner cavity; the sealing piece is arranged at the end, away from the valve element, of the first movable disc, and after the first movable disc slides, the sealing piece abuts against the valve body in a sealed mode. The second moving disc slidably sleeves the valve shaft and is positioned at one end, far away from the valve core, of the first moving disc; the two ends of the first elastic piece act on the first movable disc and the second movable disc respectively. By means of the technical scheme, the problems that in the prior art, a middle opening of an emergency cut-off valve is low in sealing performance, and when the valve is opened and closed, part of media can flow out to the outside are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency cut-off valves, in particular to a center port sealing structure for emergency cut-off valves. Background Art

[0002] The emergency shut-off valve is an important safety device, widely used in gas and liquid delivery systems, especially in systems that deliver flammable, explosive or toxic media. Its main function is to quickly close the valve automatically or manually to cut off the flow of fluid when an abnormal situation or emergency is detected, thereby preventing the accident from further expanding and protecting personnel safety and property from damage.

[0003] The middle seal of the emergency shut-off valve refers to the sealing structure located inside the valve body, between the valve shaft and the valve body. When the emergency shut-off valve is closed, the middle seal is the key to ensure that the valve completely cuts off the flow of fluid. In the prior art, the middle seal of the emergency shut-off valve is low, and when the valve is opened and closed, some of the medium will flow out to the outside. Utility Model Content

[0004] The utility model provides a middle port sealing structure for an emergency shut-off valve, which solves the problem in the related art that the middle port sealing of the emergency shut-off valve is low and part of the medium flows out to the outside when the valve is opened and closed.

[0005] The technical solution of the utility model is as follows:

[0006] A center-mouth sealing structure for an emergency shut-off valve comprises a valve body, wherein the valve body has an inner cavity, a valve shaft is rotatably arranged in the inner cavity, and the valve shaft is used to control the valve core to block or cancel the blocking of the valve body;

[0007] A first movable disk, slidably sleeved on the valve shaft, wherein the first movable disk is located at an end of the inner cavity away from the valve core;

[0008] The sealing member is arranged at one end of the first movable disk away from the valve core. After the first movable disk slides, the sealing member is in sealing contact with the valve body.

[0009] Optionally, it also includes:

[0010] A second movable disk, slidably sleeved on the valve shaft, the second movable disk being located at an end of the first movable disk away from the valve core;

[0011] The first elastic member has two ends acting on the first movable plate and the second movable plate respectively. The first elastic member is used to provide a force for the first movable plate to move away from the second movable plate. The sealing member is arranged on the first movable plate through the second movable plate and the first elastic member.

[0012] Optionally, the valve body further comprises a reflux cavity, wherein the reflux cavity is connected to the inner cavity; and further comprises:

[0013] The filling piece is arranged between the first movable plate and the second movable plate and is used for absorbing the medium. When the first movable plate approaches the second movable plate, the filling piece is squeezed.

[0014] Optionally, it also includes:

[0015] A ball core is slidably disposed at one end of the reflux chamber close to the valve core, and after the ball core slides, the reflux chamber is blocked or unblocked;

[0016] The second elastic member has two ends acting on the ball core and the reflux cavity respectively, and the second elastic member is used to provide the ball core with a force to block the reflux cavity.

[0017] Optionally, it also includes:

[0018] The guide plate group has several groups, and the guide plate groups are arrayed and distributed in the reflux chamber at intervals. Each guide plate group has two guide plate bodies that are inclined and symmetrically arranged in the reflux chamber, and the guide plate bodies point to the valve core.

[0019] Optionally, it also includes:

[0020] A fixed disk is arranged on the valve shaft, and the fixed disk is in sealing cooperation with an end of the inner cavity away from the sealing member, and the sealing member is used to be in sealing cooperation with the fixed disk after sliding.

[0021] Optionally, the fixing plate has a plurality of circumferentially distributed snap-in grooves; the sealing member further comprises:

[0022] A connecting plate, arranged on the second movable plate;

[0023] There are a plurality of clamping platforms, which are circumferentially distributed on the connecting disk. After the second movable disk slides, the clamping platforms are sealed and matched with the clamping grooves.

[0024] Optionally, the sealing member further comprises:

[0025] There are a plurality of sealing rings, and a plurality of the sealing rings are axially distributed on the plurality of the clamping platforms, respectively, and the sealing rings are used for interference fit with the clamping grooves.

[0026] Optionally, it also includes:

[0027] A butterfly spring, with two ends acting on the connecting disk and the second movable disk respectively, and the butterfly spring is used to provide a force for the sealing component to move away from the fixed disk.

[0028] The working principle and beneficial effects of the utility model are:

[0029] When the closure is closed, the closure will open after the closure is closed and the seal will be turned off. In the event of a leak in the closure, the seal will be turned off after the closure is closed. This will cause the closure to close and the seal will be turned off. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0031] Figure 1 This is a partial cross-sectional structural diagram of the utility model

[0032] Figure 2 for Figure 1 A schematic diagram of the local enlarged structure at position I in the middle;

[0033] Figure 3 for Figure 1 A schematic diagram of the local enlarged structure at II in the middle;

[0034] Figure 4 for Figure 1 A schematic diagram of the local enlarged structure at III in the middle;

[0035] Figure 5 for Figure 2 Schematic diagram of the local enlarged structure at IV in the middle.

[0036] In the figure: 1. valve body; 101. inner cavity; 102. reflux cavity; 2. valve shaft; 3. first movable disk; 4. sealing member; 401. connecting disk; 402. clamping platform; 403. sealing ring; 5. second movable disk; 6. first elastic member; 7. filling member; 8. ball core; 9. second elastic member; 10. guide plate group; 1001. guide plate body; 1002. guide channel; 1003. blocking space; 11. fixed disk; 1101. clamping groove; 12. butterfly spring. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0038] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0039] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] like Figure 1~Figure 5 As shown, this embodiment proposes a center-mouth sealing structure for an emergency shut-off valve, including a valve body 1, the valve body 1 having an inner cavity 101, a valve shaft 2 rotatably disposed in the inner cavity 101, the valve shaft 2 being used to control the valve core to block or cancel the blocking of the valve body 1; a first movable disk 3 is slidably sleeved on the valve shaft 2, the first movable disk 3 is located at one end of the inner cavity 101 away from the valve core; a sealing member 4 is disposed at one end of the first movable disk 3 away from the valve core, and after the first movable disk 3 slides, the sealing member 4 is in sealing contact with the valve body 1.

[0042] In this embodiment, the valve body 1 is the basic structure of the emergency shut-off valve. The valve body 1 has an inner cavity 101, and the inner cavity 101 can accommodate the valve shaft 2 and the valve core. The valve shaft 2 and the valve core are the core operating components of the emergency shut-off valve. The valve core is controlled to open or block the valve body 1 by rotating the valve shaft 2. When the medium in the valve body 1 leaks, the medium will flow to the connection between the valve shaft 2 and the valve body 1, which will cause the pressure at the connection between the valve shaft 2 and the valve body 1 to increase. Under the action of the high-pressure medium, the first movable disk 3 moves downward along the length direction of the valve shaft 2, driving the seal 4 to move downward, so that the seal 4 is pressed against the end of the inner cavity 101 away from the valve core under the action of the high-pressure medium and the first movable disk 3, reducing the possibility of medium leakage to the outside, and improving the sealing of the middle mouth of the emergency shut-off valve.

[0043] Optionally, it also includes: a second movable disk 5 is slidably sleeved on the valve shaft 2, and the second movable disk 5 is located at the end of the first movable disk 3 away from the valve core; both ends of the first elastic member 6 act on the first movable disk 3 and the second movable disk 5 respectively, and the first elastic member 6 is used to provide a force for the first movable disk 3 to move away from the second movable disk 5, and the sealing member 4 is arranged on the first movable disk 3 through the second movable disk 5 and the first elastic member 6.

[0044] Please refer to Figure 1 and Figure 2 In this embodiment, when the medium in the valve body 1 leaks, the medium will flow to the connection between the valve shaft 2 and the valve body 1, which will cause the pressure at the connection between the valve shaft 2 and the valve body 1 to increase. Under the action of the high-pressure medium, the first movable disk 3 moves downward along the length direction of the valve shaft 2, driving the second movable disk 5 to move downward, so that the sealing member 4 moves downward. Under the action of the high-pressure medium, the first movable disk 3 and the second movable disk 5, the sealing member 4 presses against the end of the inner cavity 101 away from the valve core. The provision of the second movable disk 5 improves the sealing performance. Even if the first movable disk 3 fails, under the action of the high-pressure medium, the second movable disk 5 can still slide downward, so that the sealing member 4 presses against the end of the inner cavity 101 away from the valve core.

[0045] Optionally, the valve body 1 further has a reflux chamber 102 , which is connected to the inner chamber 101 ; and further includes: a filling piece 7 filled and arranged between the first movable disk 3 and the second movable disk 5 for absorbing the medium, and when the first movable disk 3 approaches the second movable disk 5 , the filling piece 7 is squeezed.

[0046] Please refer to Figure 2 In this embodiment, when the medium is a liquid medium and leakage occurs, the filler 7 can absorb a part of the medium. When the first movable plate 3 moves downward, the filler 7 is subjected to extrusion force, and the absorbed part of the medium is squeezed into the reflux chamber 102, and then the medium flows back into the valve body 1 along the reflux chamber 102. It should be noted that the reflux chamber 102 should be provided with a backflow prevention and flow guide structure, so that the medium squeezed out by the filler 7 after being pressurized can smoothly flow back into the valve body 1.

[0047] Optionally, it also includes: the ball core 8 is slidably set at one end of the reflux chamber 102 close to the valve core, and after the ball core 8 slides, the reflux chamber 102 is blocked or unblocked; the two ends of the second elastic member 9 act on the ball core 8 and the reflux chamber 102 respectively, and the second elastic member 9 is used to provide the ball core 8 with force to block the reflux chamber 102.

[0048] Please refer to Figure 1 and Figure 4In this embodiment, after the medium squeezed out by the filling member 7 flows into the reflux chamber 102 after being pressurized, the medium pushes the ball core 8 upward, and the second elastic member 9 is subjected to upward pressure, pulling the ball core 8, so that the ball core 8 stops blocking the reflux chamber 102, and the medium can flow back into the valve body 1. When the medium in the reflux chamber 102 generates a reverse flow, the second elastic member 9 is subjected to downward pressure, pushing the ball core 8, so that the ball core 8 blocks the reflux chamber 102, reducing the possibility of the medium generating a reverse flow.

[0049] Optionally, it also includes: the guide plate group 10 has several groups, and the several groups of guide plate groups 10 are arrayed and distributed in the reflux chamber 102 at intervals, and each group of guide plate groups 10 has two guide plate bodies 1001 inclined and symmetrically arranged in the reflux chamber 102, and the guide plate bodies 1001 point to the valve core.

[0050] Please refer to Figure 2 and Figure 5 In this embodiment, the guide plate groups 10 are arranged in an array and at intervals in the reflux chamber 102, so as to guide the flow direction of the medium in the reflux chamber 102. Each guide plate group 10 has two symmetrical and inclined guide plate bodies 1001, and a guide channel 1002 is formed between the two symmetrical and inclined guide plate bodies 1001. The flow direction of the guide channel 1002 points to the valve core, which plays a role in guiding the flow of the medium; a blocking space 1003 is formed between two adjacent guide plate bodies 1001 on the same side of the reflux chamber 102 in the longitudinal direction, which plays a blocking role when the medium generates a reverse flow, and can intercept part of the medium in the blocking space 1003.

[0051] Optionally, it also includes: a fixed disk 11 is arranged on the valve shaft 2, the fixed disk 11 is sealed with an end of the inner cavity 101 away from the sealing member 4, and the sealing member 4 is used to seal with the fixed disk 11 after sliding.

[0052] Please refer to Figure 1 and Figure 3 In this embodiment, the fixed disk 11 is arranged on the valve shaft 2, and the inner cavity 101 of the fixed disk 11 is sealed at one end away from the seal 4. When the first movable disk 3 slides under pressure, it drives the seal 4 to slide, and the seal 4 slides and seals with the fixed disk 11. The setting of the fixed disk 11 can not only support the seal 4 but also seal with the seal 4, thereby enhancing the sealing performance and reducing the occurrence of leakage of the medium. At the same time, when the seal 4 is damaged, the fixed disk 11 can still seal the valve body 1 and also play a double sealing role.

[0053] Optionally, the fixed disk 11 has a plurality of circumferentially distributed snap-in grooves 1101; the seal 4 also includes: a connecting disk 401 is arranged on the second movable disk 5; there are a plurality of snap-in platforms 402, and the plurality of snap-in platforms 402 are circumferentially distributed on the connecting disk 401, and after the second movable disk 5 slides, the snap-in platforms 402 are sealed and matched with the snap-in grooves 1101.

[0054] Optionally, the sealing member 4 further includes: a plurality of sealing rings 403 , and a plurality of sealing rings 403 are axially distributed on the plurality of clamping platforms 402 , respectively, and the sealing rings 403 are used for interference fit with the clamping grooves 1101 .

[0055] Please refer to Figure 3 In this embodiment, after the seal 4 slides, the engaging platform 402 on the seal 4 enters into the engaging groove 1101 on the fixed disk 11, and the engaging platform 402 and the engaging groove 1101 form a sealing fit through the interference fit between the sealing ring 403 and the engaging groove 1101. The setting of the engaging groove 1101 and the engaging platform 402 provides a fixing and locking point between the seal 4 and the fixed disk 11, so that the seal 4 and the fixed disk 11 can be accurately and stably sealed. When the engaging platform 402 enters into the engaging groove 1101, the sealing ring 403 on each engaging platform 402 respectively interferes with several engaging grooves 1101 on the fixed disk 11, forming a multi-point seal, which enhances the tightness of the seal and maintains a good sealing effect even under pressure changes or vibrations.

[0056] Optionally, it further includes: two ends of a butterfly spring 12 act on the connecting disk 401 and the second movable disk 5 respectively, and the butterfly spring 12 is used to provide a force to keep the sealing member 4 away from the fixed disk 11 .

[0057] In this embodiment, when the second movable plate 5 slides downward, the disc spring is pressed downward, so that the sealing member 4 slides downward, and the sealing member 4 and the fixed plate 11 are sealed and matched.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A center-mouth sealing structure for an emergency shut-off valve, comprising a valve body (1), wherein the valve body (1) has an inner cavity (101), a valve shaft (2) is rotatably disposed in the inner cavity (101), and the valve shaft (2) is used to control the valve core to block or cancel the blockage of the valve body (1), characterized in that: Also includes: A first movable disk (3) is slidably mounted on the valve shaft (2), wherein the first movable disk (3) is located at an end of the inner cavity (101) away from the valve core; The sealing member (4) is arranged at an end of the first movable disk (3) away from the valve core, and after the first movable disk (3) slides, the sealing member (4) is in sealing contact with the valve body (1).

2. The middle port sealing structure for an emergency shut-off valve according to claim 1, characterized in that: Also includes: A second movable disk (5) is slidably sleeved on the valve shaft (2), and the second movable disk (5) is located at an end of the first movable disk (3) away from the valve core; A first elastic member (6), two ends of which act on the first movable plate (3) and the second movable plate (5) respectively, the first elastic member (6) is used to provide a force for the first movable plate (3) to move away from the second movable plate (5), and the sealing member (4) is arranged on the first movable plate (3) through the second movable plate (5) and the first elastic member (6).

3. The middle port sealing structure for an emergency shut-off valve according to claim 2, characterized in that: The valve body (1) further comprises a reflux chamber (102), wherein the reflux chamber (102) is connected to the inner chamber (101); and further comprises: A filling piece (7) is arranged between the first movable plate (3) and the second movable plate (5) and is used to absorb a medium. When the first movable plate (3) approaches the second movable plate (5), the filling piece (7) is squeezed.

4. The middle port sealing structure for an emergency shut-off valve according to claim 3, characterized in that: Also includes: A ball core (8) is slidably disposed at one end of the reflux chamber (102) close to the valve core, and after the ball core (8) slides, it blocks or cancels the blocking of the reflux chamber (102); The second elastic member (9) has two ends respectively acting on the ball core (8) and the reflux chamber (102), and the second elastic member (9) is used to provide the ball core (8) with a force to block the reflux chamber (102).

5. The middle port sealing structure for an emergency shut-off valve according to claim 4, characterized in that: Also includes: The guide plate group (10) comprises a plurality of groups, wherein the plurality of guide plate groups (10) are arrayed and spaced apart in the reflux chamber (102), and each group of the guide plate group (10) comprises two guide plate bodies (1001) which are inclined and symmetrically arranged in the reflux chamber (102), and the guide plate bodies (1001) point toward the valve core.

6. The middle port sealing structure for an emergency shut-off valve according to claim 2, characterized in that: Also includes: A fixed disk (11) is arranged on the valve shaft (2), the fixed disk (11) is sealingly matched with an end of the inner cavity (101) away from the sealing member (4), and the sealing member (4) is used to seal with the fixed disk (11) after sliding.

7. The middle port sealing structure for an emergency shut-off valve according to claim 6, characterized in that: The fixing disk (11) has a plurality of circumferentially distributed snap-in grooves (1101); the sealing element (4) further comprises: A connecting disk (401) is arranged on the second movable disk (5); The clamping platforms (402) are in plurality, and the plurality of clamping platforms (402) are circumferentially distributed on the connecting disk (401). After the second movable disk (5) slides, the clamping platforms (402) are sealed and matched with the clamping grooves (1101).

8. The middle port sealing structure for an emergency shut-off valve according to claim 7, characterized in that: The sealing member (4) further comprises: There are a plurality of sealing rings (403), and a plurality of the sealing rings (403) are axially distributed on the plurality of the clamping platforms (402), respectively. The sealing rings (403) are used for interference fit with the clamping grooves (1101).

9. The middle port sealing structure for an emergency shut-off valve according to claim 7, characterized in that: Also includes: The butterfly spring (12) has two ends respectively acting on the connecting disk (401) and the second movable disk (5), and the butterfly spring (12) is used to provide a force to move the sealing component (4) away from the fixed disk (11).

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