Sealing device of efficient stop valve, efficient stop valve and fluid control system

Abstract

The utility model discloses a sealing device of a high-efficiency stop valve, the high-efficiency stop valve and a fluid control system, the stop valve comprises a valve seat, a valve core and a valve rod, the sealing device comprises a sealing groove arranged on the sealing surface of the valve core along the circumferential direction; one end of the spring is fixed in the sealing groove; the inflatable rubber sliding block is sleeved on the valve core in a sliding manner and is fixed at the other end of the spring; the inflatable inner core is located in the inflatable rubber sliding block; and the inflating and deflating structure is communicated with the inflating inner core and is used for inflating or deflating the inflating inner core. The inflatable rubber sliding block soft sealing technology is adopted, sealing materials and structural configuration are optimized, the sealing performance between the valve element and the valve seat is enhanced, the reliability and the sealing grade of the valve are effectively improved, meanwhile, the leakage risk of the stop valve is reduced, a tiny gap between metal sealing faces is avoided through the inflatable soft sealing structure, and the service life of the stop valve is prolonged. And the problem of sealing surface erosion caused by the cavitation phenomenon can be reduced.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a sealing device for a high-efficiency shut-off valve, as well as a high-efficiency shut-off valve and a fluid control system. Background Technology

[0002] A valve is a pressure piping component used to change the cross-sectional area of ​​a pipeline and the direction of medium flow, controlling the pressure, flow rate, and temperature of the transported medium. Valves have a wide range of applications and are an indispensable part of industrial pipeline accessories and equipment.

[0003] A gate valve is a common industrial valve, named for its ability to effectively cut off or regulate fluid flow. In piping systems, gate valves are primarily used to control fluid flow, enabling opening, closing, or regulation of the flow rate. Its main components include the valve core, valve seat, and valve stem. The valve core is typically disc-shaped and located inside the pipe, changing the fluid flow state by raising, lowering, or rotating the valve stem. When the valve core is fully raised, the valve is fully open, allowing smooth fluid flow; when the valve core is fully closed, the fluid is completely blocked; and in the intermediate position, flow regulation is achieved.

[0004] Compared to some other valve types, gate valves may have poorer sealing performance, especially when fully closed. In applications involving high-temperature, high-pressure, or highly corrosive fluids, the risk of leakage may still exist. Conversely, soft-seal gate valves, unlike traditional hard-seal gate valves with their harder sealing surfaces, are prone to wear and tear over time, leading to decreased sealing performance. Furthermore, hard seals cannot adapt to changes in medium temperature, resulting in leakage due to thermal expansion and contraction. Additionally, the high torque required in high-temperature and high-pressure environments increases the burden on the actuator, potentially causing mechanical failure. Utility Model Content

[0005] The purpose of this application is to provide a sealing device for a high-efficiency shut-off valve, as well as a high-efficiency shut-off valve and a fluid control system, to solve the problem of high leakage risk due to the contact seal between the valve core and the valve seat in related technologies.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] In a first aspect, a sealing device for a high-efficiency gate valve is provided, the gate valve comprising a valve seat, a valve core, and a valve stem, the sealing device comprising:

[0008] A sealing groove is formed on the sealing surface of the valve core along the circumferential direction;

[0009] A spring, one end of which is fixed inside the sealing groove;

[0010] An inflatable rubber slider is slidably fitted onto the valve core and fixed to the other end of the spring;

[0011] The inflatable inner core is located inside the inflatable rubber slider and is placed around the valve core in a ring-shaped distribution structure.

[0012] An inflation / deflation structure is connected to the inflatable inner core and is used to inflate or deflate the inflatable inner core.

[0013] Optionally, the valve seat is provided with a valve seat hole for the valve stem to pass through, the valve core is located in the valve seat and fixedly connected to the valve stem, and the valve core moves up and down with the valve stem.

[0014] Optionally, the inflatable rubber slider is annular.

[0015] Optionally, the valve stem has an external thread, and the valve core has an internal thread, with the external thread and the internal thread engaging.

[0016] Optionally, the length of the spring in its natural state is 2mm-5mm.

[0017] Optionally, the inflation / deflation structure includes an air passage that is connected to the inflation core, and the air passage is located on the valve core and valve stem.

[0018] Optionally, the inflation / deflation structure further includes an air pump, which is connected to the air passage.

[0019] In a second aspect, a high-efficiency shut-off valve is provided, including the sealing device described in the first aspect.

[0020] Thirdly, a fluid control system is provided, including the high-efficiency shut-off valve described in the second aspect.

[0021] The fluid control system includes:

[0022] A control module, connected to the air pump, is used to adjust the sealing state of the shut-off valve;

[0023] The sensing unit is used to detect pressure changes or sealing status before and after the shut-off valve.

[0024] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0025] As can be seen from the above embodiments, this application adopts an inflatable rubber slider soft seal. The soft sealing material forms a buffer layer when the valve core and valve seat come into contact, avoiding hard contact between metal seals, reducing the wear rate, and has good elasticity. When the valve is closed, it can completely fill the sealing gap to prevent media leakage.

[0026] This application can adaptively adjust during use, avoid hard contact between metal seals, compensate for wear caused by friction, and keep the gate valve in a good sealing state for a long time. It can also compensate for the slight deformation of the sealing surface caused by thermal expansion and contraction, and is suitable for high temperature and high pressure and low temperature and low pressure working conditions.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0029] Figure 1 This is a schematic diagram of a traditional gate valve.

[0030] Figure 2 This is a schematic diagram of the shut-off valve provided in an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram showing the position of the inflatable rubber slider when the shut-off valve is opened, as provided in an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram showing the position of the inflatable rubber slider when the shut-off valve is closed, as provided in an embodiment of the present invention.

[0033] Reference numerals: 1. Valve seat; 2. Valve core; 3. Valve stem; 4. Inflatable rubber slider; 5. Spring; 6. Sealing groove; 7. Inflatable inner core; 8. Air passage. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0035] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] Figure 1This is a schematic diagram of a traditional gate valve. The gate valve includes a valve seat 1, a valve core 2, and a valve stem 3. The valve seat 1 has a valve seat 1 hole for the valve stem 3 to pass through. The valve core 2 is located inside the valve seat 1 and is fixedly connected to the valve stem 3. The valve core 2 moves up and down with the valve stem 3 to realize the functions of opening and closing the gate valve and regulating flow. When the traditional valve core 2 contacts the valve seat 1, stress concentration in the corner area may prevent the sealing surface from completely fitting, resulting in insufficient local sealing pressure and thus a risk of leakage. Uneven sealing pressure distribution leads to poor sealing performance in some areas, especially under high pressure or low differential pressure conditions, making micro-leakage prone to occur. Due to thermal expansion and contraction, the sealing surface of the valve core 2 may undergo slight deformation, further reducing sealing performance.

[0037] To address the shortcomings of traditional gate valves, the present invention improves upon this by changing the traditional centralized sealing method and using an inflatable rubber slider 4 to ensure the sealing performance of the gate valve in the closed state.

[0038] refer to Figures 2-4 This invention provides a sealing device for a high-efficiency shut-off valve, which may include:

[0039] The valve core 2 is provided with a sealing groove 6, a spring 5, an inflatable rubber slider 4, an inflatable inner core 7, and an inflation / deflation structure. The sealing groove 6 is formed on the sealing surface of the valve core 2 along the circumferential direction. One end of the spring 5 is fixed inside the sealing groove 6. The inflatable rubber slider 4 is slidably sleeved on the valve core 2 and fixed to the other end of the spring 5. The inflatable inner core 7 is located inside the inflatable rubber slider 4 and is placed around the valve core 2 in a ring-shaped distribution structure. The inflation / deflation structure is connected to the inflatable inner core 7 and is used to inflate or deflate the inflatable inner core 7.

[0040] Initially, the spring 5 is extended under the gravity of the inflatable rubber slider 4. When the valve body is in a sealed state, one ring of the inflatable rubber slider 4 adheres to the wall of the valve seat 1 under the action of the spring 5 to achieve a soft seal. When the valve body is in an open state, one ring of the inflatable rubber slider 4 is slightly pushed out of the sealing groove 6 under the action of the spring 5. The inflatable inner core 7 is located inside the inflatable rubber slider 4 and is connected to the inflation / deflation structure. When the valve body is in a sealed state, the inflatable inner core 7 is inflated, causing the inflatable rubber slider 4 to expand slightly and adhere to the wall of the valve seat 1 to further form an adaptive seal. This application uses the inflatable rubber slider 4 for soft sealing, which improves the sealing performance between the valve core 2 and the valve seat 1, reduces the system cost, and reduces the leakage risk of the valve.

[0041] In one embodiment, the valve stem 3 has an external thread, and the valve seat 1 has an internal thread, with the external thread and the internal thread engaging with each other.

[0042] Specifically, the pitch of the external thread and the internal thread is no greater than 5mm. Since the valve stem 3 has only a short vertical stroke, a smaller pitch is generally chosen. A pitch exceeding 5mm will not affect the valve's sealing, but it will cause interference during rotation, i.e., rotation will be obstructed.

[0043] In one embodiment, the inflatable rubber slider 4 is annular and can fit tightly against the valve seat 1 when closed.

[0044] In one embodiment, the spring has a length of 2mm-5mm in its natural state.

[0045] In one embodiment, the inflation / deflation structure includes an air passage that is connected to the inflation core and is located on the valve core and valve stem.

[0046] In one embodiment, the inflation / deflation structure further includes an air pump connected to the air passage.

[0047] Figure 3 This is a cross-sectional view of the shut-off valve when it is open. In the open state, spring 5 is in the extended state.

[0048] Figure 4 This is a cross-sectional view of the shut-off valve when it is closed. The inflatable rubber slider 4 is in contact with the wall of the valve seat 1 under the action of the spring 5 and the inflatable inner core 7. When the valve is closed, the inflatable rubber slider 4 is tightly in contact with the wall of the valve seat 1 under the action of the spring 5 and the inflatable inner core 7, thus achieving a seal of the entire flow channel. Using this sealing method greatly reduces the risk of leakage of the shut-off valve.

[0049] This application also provides a high-efficiency shut-off valve, including the sealing device described above.

[0050] This application also provides a fluid control system, including the aforementioned high-efficiency shut-off valve.

[0051] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0052] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A sealing device for a high-efficiency stop valve, said stop valve comprising a valve seat, a valve core and a valve stem, characterized in that, The sealing device comprises: a sealing groove opened on the sealing surface of the valve core in the circumferential direction; a spring fixed at one end in the sealing groove; an inflatable rubber sliding block slidably sleeved on the valve core and fixed at the other end of the spring; an inflatable inner core located in the inflatable rubber sliding block, placed around the valve core in a ring-shaped distribution structure; an inflation and deflation structure connected to the inflatable inner core for inflating or deflating the inflatable inner core.

2. The sealing device of claim 1, wherein The valve seat is provided with a valve seat hole for the valve rod to pass through, the valve core is located in the valve seat and fixedly connected with the valve rod, and the valve core moves up and down with the valve rod.

3. The sealing device of claim 1, wherein The inflatable rubber sliding block is in the shape of a circular ring.

4. The sealing device of claim 1, wherein The valve rod has external threads, and the valve core has internal threads, and the external threads and the internal threads are engaged.

5. The sealed device of claim 1, wherein, The length of the spring in the natural state is 2-5 mm.

6. The sealed device of claim 1, wherein, The inflation and deflation structure comprises an air passage, the air passage is connected to the inflatable inner core, and the air passage is opened on the valve core and the valve rod.

7. The sealing device of claim 6, wherein The inflation and deflation structure further comprises an air pump, and the air pump is connected to the air passage.

8. A high performance stop valve characterized by, The sealing device of claim 1 is included.

9. A fluid control system characterized by, The high-efficiency stop valve of claim 8 is included.

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