Valve seat sealing structure and valve comprising same

Abstract

The utility model relates to a valve seat sealing structure and a valve comprising the same, and belongs to the technical field of valve sealing. Comprising a valve seat, a mounting groove used for containing a sealing piece is formed in the valve seat, and two opposite slopes are formed on the inner wall of the mounting groove; the sealing jacket is mounted in the mounting groove, and the sealing jacket is provided with an external contact surface which is used for abutting against a valve ball body to form sealing; the elastic piece is arranged in the sealing jacket, and the elastic piece is provided with two abutting parts which abut against the two slopes of the mounting groove respectively; meanwhile, the side wall of the sealing jacket is more tightly pushed to the inner wall of the mounting groove through the sealing force, effective radial auxiliary sealing is formed, the sealing jacket can be prevented from being separated due to the fact that the sealing jacket is tightly attached to the inner wall of the mounting groove, and therefore the sealing performance is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve sealing technical field, concretely relates to a valve seat sealing structure and valve containing the sealing structure. BACKGROUND

[0002] Valve is the indispensable key control element in fluid conveying system, and its sealing performance is directly related to the safety, reliability and economy of the whole system. As the core component of valve, the performance of valve seat sealing structure is the key to determine the grade and application range of valve. In high-end application fields such as petroleum chemical industry, aerospace, nuclear power and deep sea equipment, the valve often needs to work under extremely wide temperature range and huge pressure difference, which puts high requirements on the reliability of valve seat sealing structure.

[0003] At present, the conventional valve seat sealing, such as single elastomer sealing element such as O-ring, has many inherent defects. Because it will be hardened and invalid at low temperature, and it will accelerate aging and produce permanent deformation at high temperature, thereby it is easily extruded from the installation groove and damaged under high pressure working condition, thereby reducing the sealing performance of valve. UTILITY MODEL CONTENTS

[0004] To solve the above technical problems of prior art, the utility model provides a valve seat sealing structure and valve containing the sealing structure.

[0005] In order to realize the above purpose, the utility model adopts the technical scheme that:

[0006] Provide a kind of valve seat sealing structure, comprising:

[0007] Valve seat, the installation groove for accommodating sealing element is set on the valve seat, and the inner wall of the installation groove is formed with two oppositely arranged inclined surfaces;

[0008] Sealing jacket, the sealing jacket is installed in the installation groove, and it has an external contact surface for abutting against the valve ball to form a seal;

[0009] Elastic element, the elastic element is arranged in the interior of the sealing jacket, and it has two abutting portions respectively abutting on the two inclined surfaces of the installation groove;

[0010] Wherein, when the external contact surface is subjected to pressure from the valve ball, the pressure is transmitted to the elastic element via the sealing jacket, and drives the two abutting portions to relatively displace along the respective inclined surfaces, so that the opening of the elastic element expands and generates a sealing force, and the sealing force simultaneously acts on the sealing jacket, so that the sealing jacket is tightly fitted on the valve ball and the inner wall of the installation groove.

[0011] Preferably, the elastic element has:

[0012] connecting portion;

[0013] two elastic arms extending from the connecting portion, an opening being formed between the two elastic arms;

[0014] and two abutting portions respectively formed at the ends of the two elastic arms, the abutting portions being portions for abutting against the inclined surface of the mounting groove.

[0015] Preferably, the sealing jacket has:

[0016] a jacket body;

[0017] a sealing portion formed on the outside of the jacket body and used for contacting the valve ball;

[0018] an inner cavity opened in the inside of the jacket body and used for accommodating the elastic member;

[0019] and two side walls respectively located on the two sides of the inner cavity, the sealing force generated by the expansion of the elastic member being transmitted to the inner wall of the mounting groove through the two side walls.

[0020] Preferably, at least one friction protrusion is integrally formed on the outer wall surface of the two side walls of the sealing jacket.

[0021] Preferably, a positioning groove used for clamping the friction protrusion is opened on the inner wall of the mounting groove at the position corresponding to the friction protrusion.

[0022] Preferably, the sealing jacket is composed of at least two layers of materials with different colors, the outer layer being a working layer and the inner layer being an indicating layer;

[0023] wherein, when the working layer is worn to a predetermined thickness, the indicating layer is exposed to serve as a warning that the sealing jacket needs to be replaced.

[0024] Preferably, the sealing portion has:

[0025] a first lip portion and a second lip portion separated from each other;

[0026] a cavity for accommodating lubricating medium being formed between the first lip portion and the second lip portion.

[0027] Preferably, at least one reinforcing rib is integrally formed on the inner wall of the inner cavity, the reinforcing rib connecting at least two different inner wall surfaces of the inner cavity.

[0028] Preferably, the two elastic arms of the elastic member are of variable cross-section structure, the cross-section thickness or width of which increases or decreases along the length direction thereof.

[0029] The utility model further provides a valve, at least comprising:

[0030] The valve seat sealing structure according to any one of the technical solutions.

[0031] The utility model provides a valve seat sealing structure and contain the valve of this sealing structure, the beneficial effect of the utility model is reflected in:

[0032] Sealing force is through the sealing clamping cover, pushes the outer contact surface more closely to the valve ball, forms a reliable axial main seal, sealing force also pushes the side wall of sealing clamping cover more closely to the inner wall of installation groove simultaneously, forms an effective radial auxiliary seal, and, on the other hand, because of the close fit of sealing clamping cover and installation groove inner wall, sealing clamping cover will also be avoided to separate, thereby guaranteeing the sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The structure diagram of the valve seat sealing structure provided by the utility model is shown in the figure;

[0034] Figure 2 The front view of the sealing clamping cover in the valve seat sealing structure provided by the utility model is shown in the figure;

[0035] Figure 3 The figure is Figure 2 The local enlarged schematic view at A;

[0036] Figure 4 The figure is Figure 2 The local enlarged schematic view at B;

[0037] Figure 5 The figure is Figure 2 The local enlarged schematic view at C.

[0038] Explanation of reference signs:

[0039] 1, valve seat; 2, installation groove; 3, inclined surface; 4, sealing clamping cover; 401, clamping cover body; 402, sealing part; 4021, first lip part; 4022, second lip part; 403, inner cavity; 404, side wall; 5, valve ball; 6, elastic member; 601, abutting part; 602, connecting part; 603, elastic arm; 7, friction protrusion. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0041] Please refer to Figures 1-5As shown in the specific embodiments of the utility model provide, for example, as follows: Figures 1-2 As shown in the embodiment of the utility model provides a valve seat 1 sealing structure, including valve seat 1, install in the sealing jacket 4 of the valve seat 1 in, and the elastic member 6 being arranged in the sealing jacket 4 inside.

[0042] Specifically, the valve seat 1 has an installation groove 2 for installing and positioning the sealing assembly. The inner wall of the installation groove 2 is machined to have two oppositely arranged inclined surfaces 3. The sealing jacket 4 is installed in the installation groove 2. The sealing jacket 4 has an external contact surface for directly contacting the valve ball 5 and forming a main seal. The sealing jacket 4 is made of a high-molecular material with certain wear resistance and chemical corrosion resistance.

[0043] The elastic member 6, for example, a C-shaped or V-shaped spring, is contained in the internal cavity of the sealing jacket 4. The elastic member 6 has two structurally abutting portions 601, which respectively abut against the two inclined surfaces 3 of the inner wall of the installation groove 2 in the assembled state, forming a predetermined fitting relationship.

[0044] When the valve is working, the valve ball 5 is tightly pressed against the external contact surface of the sealing jacket 4 under the pressure of the medium or the driving of the actuator. Thus, the pressure is first transmitted to the elastic member 6 in the sealing jacket 4 through the sleeve body. Under the continuous action of the pressure, the two abutting portions 601 of the elastic member 6 are subjected to a downward and outward component force along the inclined surface 3, so as to be driven to slide and displace slightly along the respective inclined surface 3. Due to the geometric configuration of the elastic member 6, the sliding displacement forces the opening of the elastic member 6 to expand.

[0045] Based on this, the passively expanding elastic member 6 generates an elastic restoring force, which is the sealing force. The sealing force acts on the sealing jacket 4 and produces a double sealing effect: first, the sealing force pushes the external contact surface of the sealing jacket 4 more tightly against the valve ball 5 through the sealing jacket 4, forming a reliable axial main seal; second, the sealing force also pushes the side wall 404 of the sealing jacket 4 more tightly against the inner wall of the installation groove 2, forming an effective radial auxiliary seal. On the other hand, due to the close fit between the sealing jacket 4 and the inner wall of the installation groove 2, the sealing jacket 4 is also prevented from disengaging, thereby ensuring the sealing performance.

[0046] As shown in the specific embodiments of the utility model provide, for example, as follows: Figures 3-5 As shown in a preferred embodiment, the elastic member 6 has a connecting portion 602. For example, in a V-shaped spring embodiment, the connecting portion 602 is the vertex region of the V-shaped spring; in a C-shaped spring embodiment, the connecting portion 602 is the bottom of the circular arc.

[0047] Two elastic arms 603 extend integrally from the connecting portion 602. The two elastic arms 603 are the main functional parts of the elastic member 6 to generate and store elastic energy. In the natural state, an opening with a preset width is formed between the two elastic arms 603. When the elastic member 6 is under pressure, the two elastic arms 603 undergo major bending or elastic deformation, resulting in the expansion of the opening.

[0048] At the free ends of each elastic arm 603 away from the connecting portion 602, an abutting portion 601 is formed, respectively. Through the abutting portion 601, the pressure from the sealing sleeve 4 is applied to the inclined surface 3 of the mounting groove 2 and is decomposed and converted into a force that drives the elastic arm 603 to expand.

[0049] In a preferred embodiment, the sealing sleeve 4 has a sleeve body 401, and a sealing portion 402 is formed on the outer side of the sleeve body 401, particularly on the side facing the valve ball 5. The sealing portion 402 is the working surface for directly contacting the valve ball 5 to form the main seal. An inner cavity 403 is formed in the inside of the sleeve body 401. The shape and size of the inner cavity 403 match those of the elastic member 6, for accommodating and positioning the elastic member 6 during assembly, and providing a preset movement space for the expansion and deformation of the elastic member 6.

[0050] The sleeve body 401 further includes two side walls 404 located on both sides of the inner cavity 403, respectively. When the elastic member 6 in the inner cavity 403 expands due to pressure, the outward elastic restoring force generated by the elastic member 6 directly acts on the two side walls 404. Then, the two side walls 404 uniformly transmit the force to the inner wall of the mounting groove 2, thereby forming a reliable radial auxiliary seal, effectively preventing the medium from leaking from the gap between the sealing member and the mounting groove 2, and being in close contact with the inner wall of the mounting groove 2 to avoid falling off.

[0051] In a preferred embodiment, during the opening and closing of the valve, particularly the ball valve, friction torque is generated between the rotating ball and the stationary sealing sleeve 4. In some cases, the torque may overcome the static friction between the sealing sleeve 4 and the mounting groove 2, causing the entire sealing sleeve 4 to rotate or twist in the mounting groove 2. This abnormal rotation will cause the contact point between the sealing portion 402 and the ball to deviate, resulting in uneven wear, and even leading to seal failure.

[0052] To solve this technical problem, at least one friction protrusion 7 is integrally formed on the outer wall surface of the two side walls 404 of the sealing sleeve 4.

[0053] The friction protrusions 7 can be single or multiple point protrusions, strip protrusions or other geometric shapes capable of increasing friction. After the sealing structure is installed, the friction protrusions 7 will tightly fit or be embedded with the inner wall of the installation groove 2 of the valve seat 1. In this way, the static friction torque and mechanical engagement force between the sealing jacket 4 and the valve seat 1 are greatly improved. Thus, the friction torque generated when the valve ball 5 rotates is far insufficient to drive the sealing jacket 4 to rotate, thereby effectively locking the sealing jacket 4 in the installation groove 2 and ensuring the absolute stability of the sealing point, avoiding abnormal wear and enhancing the long-term working reliability of the sealing structure.

[0054] In a preferred embodiment, a positioning groove for clamping the friction protrusions 7 is formed on the inner wall of the installation groove 2 corresponding to the position of the friction protrusions 7.

[0055] The geometric shape, size and position of the positioning groove match the friction protrusions 7 on the side wall 404 of the sealing jacket 4. During installation, the friction protrusions 7 on the sealing jacket 4 are embedded in the positioning groove of the inner wall of the installation groove 2, forming a mechanical interlocking relationship similar to a key and a key groove.

[0056] In a preferred embodiment, in a conventional sealing structure, the wear of the sealing member occurs inside the valve and is invisible. Maintenance personnel cannot determine the remaining service life and can only replace it periodically (possibly causing waste) or perform passive repair after a leak occurs (possibly causing safety accidents or production interruptions).

[0057] To overcome the above-mentioned defects, the sealing jacket 4 described in the present embodiment is composed of at least two layers of different colors. The outer layer is the working layer and the inner layer is the indicating layer.

[0058] The working layer is the part of the sealing jacket 4 that directly contacts the valve ball 5 and performs the main sealing function, and is usually made of excellent wear-resistant sealing material, and the color is usually the natural color of the material or a conventional industrial color (such as black, white).

[0059] The indicating layer is located below the working layer and is made of a color that is in sharp contrast to the color of the working layer, such as red, yellow or orange.

[0060] During the long-term operation and opening and closing of the valve, the working layer on the outside will gradually wear out due to friction, and its thickness will gradually decrease. When the wear reaches the pre-set safety limit, the working layer is worn out, and the indicating layer below it will be exposed. Therefore, during routine inspection of the equipment, maintenance personnel can visually observe that if the warning color appears at the sealing member position, it can be determined that the sealing jacket 4 has reached the end of its service life, so that the replacement work can be planned.

[0061] In a preferred embodiment, the sealing part 402 has a first lip 4021 and a second lip 4022 separated from each other. The two lips are structurally independent from each other and are arranged axially spaced apart along the valve seat 1, and together form two lines of defense for the sealing. Between the first lip 4021 and the second lip 4022, an annular cavity is formed, which is used to accommodate lubricating medium. During the manufacturing or installation of the sealing, the cavity can be pre-filled with high-performance lubricating grease or other medium.

[0062] In this way, the first lip 4021 and the second lip 4022 form a double-sealing. Even if one of the lips is damaged accidentally or worn out over time, the other lip can take over and continue to maintain effective sealing, thereby preventing sudden leakage accidents.

[0063] On the other hand, the intermediate cavity stores lubricant, which can continuously provide lubrication for the two lips during the long-term operation and frequent opening and closing of the valve, thereby reducing the friction coefficient and wear rate, reducing the operation torque, and prolonging the overall service life of the sealing.

[0064] In a preferred embodiment, at least one reinforcing rib is integrally formed on the inner wall of the inner cavity 403, and the reinforcing rib connects at least two different inner wall surfaces of the inner cavity 403.

[0065] Specifically, the reinforcing rib can be a radial rib extending from the top of the inner cavity 403 (close to the side of the sealing part 402) to the side wall 404 of the inner cavity 403, or a transverse support beam connecting two opposite side walls 404. In terms of spatial layout, it avoids the installation path of the elastic member 6, for example, it can be a plurality of vertical columns distributed in the circumferential direction, and the elastic member 6 is installed in the gap between the vertical columns.

[0066] When the sealing jacket 4 is subjected to pressure from the outside, the reinforcing rib can provide structural support and effectively resist and disperse stress, preventing the jacket body 401 from collapsing and deforming.

[0067] In a preferred embodiment, the two elastic arms 603 of the elastic member 6 are of variable cross-section structure. Specifically, the cross-sectional thickness or width of the elastic arm 603 increases or decreases along its length direction. In a preferred embodiment, the root region of the elastic arm 603 close to the connecting part 602 is thicker, and the end region close to the abutting part 601 is thinner.

[0068] Thus, in the low pressure or initial compression stage, the deformation mainly occurs in the thinner end part of the elastic arm 603. At this time, the elastic member 6 only needs a small pressure to generate sufficient deformation and adhesion force, ensuring high sensitivity and reliable sealing of the seal under low pressure working conditions. In the high pressure or deep compression stage, as the compression stroke increases, the thicker root region of the elastic arm 603 begins to participate in the deformation. At this time, the overall stiffness of the elastic member 6 increases, and a larger support force can be generated, effectively resisting the extrusion force of the high-pressure medium, preventing the seal cartridge 4 from being crushed or extruded.

[0069] The embodiments of the utility model also provide a valve, at least include the valve seat sealing structure as any one of above-mentioned embodiment. It has all beneficial effects above, here no more.

[0070] Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and deformations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A valve seat seal structure, characterized by, The valve seat comprises: a valve seat having a mounting groove for accommodating a sealing member, and the inner wall of the mounting groove is formed with two oppositely arranged inclined surfaces; a sealing jacket installed in the mounting groove, which has an external contact surface for abutting against the valve ball to form a seal; a resilient member arranged inside the sealing jacket, which has two abutting portions respectively abutting against the two inclined surfaces of the mounting groove; wherein when the external contact surface is subjected to pressure from the valve ball, the pressure is transmitted to the resilient member through the sealing jacket, and drives the two abutting portions to relatively displace along the respective inclined surfaces, so that the opening of the resilient member expands and generates a sealing force which simultaneously acts on the sealing jacket to make it tightly fit the valve ball and the inner wall of the mounting groove.

2. The valve seat sealing structure according to claim 1, characterized by The resilient member has: a connecting portion; two resilient arms extending from the connecting portion, and an opening is formed between the two resilient arms; and two abutting portions respectively formed at the ends of the two resilient arms, which are portions for abutting against the inclined surfaces of the mounting groove.

3. The valve seat sealing structure according to claim 2, characterized in that, The sealing jacket has: a jacket body; a sealing portion formed on the outside of the jacket body and used for contacting the valve ball; an inner cavity formed in the inside of the jacket body and used for accommodating the resilient member; and two side walls respectively located on both sides of the inner cavity, through which the sealing force generated when the resilient member expands is transmitted to the inner wall of the mounting groove.

4. The valve seat sealing structure according to claim 3, wherein at least one friction protrusion is integrally formed on the outer wall surface of each of the two side walls of the sealing jacket.

5. The valve seat sealing structure according to claim 4, wherein a positioning groove for clamping the friction protrusion is formed on the inner wall of the mounting groove at a position corresponding to the friction protrusion.

6. The valve seat sealing structure according to claim 5, wherein the sealing jacket is composed of at least two layers of different materials, an outer layer being a working layer and an inner layer being an indicating layer; wherein when the working layer is worn to a predetermined thickness, the indicating layer is exposed to serve as a warning that the sealing jacket needs to be replaced.

7. The valve seat sealing structure according to claim 6, characterized by The sealing portion has: a first lip portion and a second lip portion separated from each other; a cavity for accommodating lubricating medium is formed between the first lip portion and the second lip portion.

8. The valve seat sealing structure according to claim 7, wherein at least one reinforcing rib is integrally formed on the inner wall of the inner cavity, and the reinforcing rib connects at least two different inner wall surfaces of the inner cavity.

9. The valve seat sealing structure according to claim 8, wherein the two resilient arms of the resilient member are of variable cross-section structure, and the cross-sectional thickness or width thereof increases or decreases along the length direction thereof.

10. A valve characterized by, at least comprising: the valve seat sealing structure according to any one of claims 1 to 9.

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