A valve with double sealing cover structure

Abstract

The present invention discloses a valve with a double sealing cover structure, comprising a valve body, a driving rod, a sealing component and an elastic component, wherein the sealing component comprises an upper sealing cover and an adjusting cover plate which are relatively fixed to the driving rod, and a lower sealing cover which is movably sleeved on the driving rod and slidably connected to the adjusting cover plate, wherein a first sealing ring is tightly arranged between the lower sealing cover and the adjusting cover plate, and the elastic component comprises a first spring which is arranged between the lower sealing cover and the bottom of the valve body, and a second spring which is arranged between the adjusting cover plate and the bottom of the valve body. By adopting the technical scheme, the relative distance between the upper sealing cover and the lower sealing cover is adjusted by adaptive displacement adjustment between the adjusting cover plate and the lower sealing cover, so as to ensure that the upper and lower sealing covers can realize independent sealing of the upper and lower valve ports by the first spring and the second spring respectively, thereby avoiding gas leakage accidents between the two sealing covers and the two valve ports, improving the sealing performance of the product, and ensuring safe and reliable use.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a valve with a double sealing cover structure. Background Art

[0002] The valve is a device used to control the gas, liquid and gas or liquid containing solid powder in various pipelines and equipment. It can be used to cut off, connect and adjust the gas in the pipeline. It has good control characteristics and closing and sealing performance. It is suitable for various fuel gas pipelines such as city gas, liquefied petroleum gas, natural gas, oxygen, etc. An existing gas valve is mainly composed of a driving mechanism, a moving valve core, a sealing cover, and a valve body of a valve port. The control function of the valve is to rely on the driving mechanism or fluid to drive the valve core to drive the sealing cover to achieve lifting and lowering, thereby opening or closing the valve port. Usually, there is only one valve port on the valve body. In order to increase the flow rate when opening, a common practice is to set a double valve port structure on the valve body. Since the two valve ports are far away from the moving valve core, a driving rod passing through the two valve ports is linked to the moving valve core, and two sealing covers are provided on the driving rod. The two sealing covers are respectively fixed to the driving rod by means of retaining springs. However, due to the difference in the processing dimensions of the parts, the actual installation distance between the two sealing covers is greater than or less than the required distance between the two valve ports. During use, one sealing cover tightly closes one valve port, while a matching gap is generated between the other sealing cover and the other valve port, so that the two sealing covers cannot independently seal the two valve ports, thereby causing gas valve leakage and resulting in a safety accident. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the two sealing covers produce a gap when fitting with the two valve ports due to the difference in processing dimensions, resulting in the two sealing covers being unable to independently seal the two valve ports, thereby causing valve leakage.

[0004] In order to solve the above technical problems, the present invention provides a valve with a double sealing cover structure, comprising:

[0005] A valve body having an upper valve port and a lower valve port opposite to each other;

[0006] A driving rod is reciprocatably disposed in the upper valve port and the lower valve port; and further comprises:

[0007] A sealing assembly, comprising an upper sealing cover and an adjusting cover plate which are relatively fixed to the driving rod and form a linkage fit, and a lower sealing cover which is movably sleeved on the driving rod and connected to the lower side of the adjusting cover plate, wherein the adjusting cover plate is slidable along the axial direction of the driving rod relative to the lower sealing cover and is suitable for entering and exiting the lower valve port, and a first sealing ring is tightly arranged between the lower sealing cover and the adjusting cover plate;

[0008] The elastic component includes a first spring arranged between the lower sealing cover and the bottom of the valve body, and a second spring arranged between the regulating cover plate and the bottom of the valve body; the lower sealing cover is driven by the elastic force applied by the first spring to move up and close at the lower valve port, and the regulating cover plate is driven by the elastic force applied by the second spring to move relative to the lower sealing cover and drive the upper sealing cover to move up and close at the upper valve port.

[0009] As a preferred solution, the lower sealing cover is slidably connected to the adjustment cover plate, and the sliding distance between the lower sealing cover and the adjustment cover plate is the adjustment distance that the upper sealing cover moves relative to the lower sealing cover.

[0010] As a preferred solution, the lower sealing cover is connected to the bottom side of the adjusting cover plate, the lower sealing cover is annular in structure and has a center hole for the driving rod to pass through, so that the second spring abuts against the bottom side of the adjusting cover plate through the center hole.

[0011] As a preferred solution, the first spring is sleeved on the outside of the second spring, one end of the first spring and the second spring are jointly arranged in an annular groove arranged at the bottom of the valve body, the lower sealing cover is correspondingly provided with a first positioning groove connected to the other end of the first spring, and the adjusting cover plate is correspondingly provided with a second positioning groove connected to the other end of the second spring.

[0012] As a preferred solution, the upper sealing cover and the adjusting cover plate are kept in fixed relative position on the driving rod by a connecting structure, and the connecting structure includes: a limit pad fixed to the driving rod and abutting against the top of the upper sealing cover, and a supporting sleeve abutting against the upper sealing cover and the adjusting cover plate, the supporting sleeve is sleeved on the driving rod, and the adjusting cover plate maintains close contact with the supporting sleeve under the action of the second spring, and transmits the elastic force of the second spring to the upper sealing cover through the supporting sleeve.

[0013] As a preferred solution, the upper sealing cover and the adjusting cover plate are respectively provided with two mounting through holes for the driving rod to pass through, the mounting through holes include a first hole portion, a second hole portion and a third hole portion with successively increasing apertures, a limiting step is formed between the second hole portion and the first hole portion, at least one second sealing ring for sealingly connecting the driving rod is provided in the second hole portion, the supporting sleeve is matched and inserted into the third hole portion, so that the second sealing ring is limited and blocked on both sides by the limiting step and the supporting sleeve.

[0014] As a preferred embodiment, the lower sealing cover includes a circular groove opening toward the adjusting cover plate, the adjusting cover plate includes a circular protrusion slidably connected to the circular groove, an outer side of the circular protrusion is formed with an outer connecting wall, an inner connecting wall is formed inside the circular groove and is in sliding contact with the outer connecting wall, and a first sealing ring is arranged between the outer connecting wall and the inner connecting wall.

[0015] As a preferred solution, the center hole of the lower sealing cover is penetrated in the circular groove, the second spring passes through the center hole and abuts against the circular protrusion, and an adjustment gap is formed between the lower sealing cover and the adjustment cover plate.

[0016] As a preferred embodiment, the lower sealing cover includes a first stop surface and a groove bottom surface connected to the upper and lower sides of the inner connecting wall, the adjustment cover plate includes a second stop surface and a raised end surface connected to the upper and lower sides of the outer connecting wall, and the adjustment gap includes a first gap formed between the first stop surface and the second stop surface, and a second gap formed between the groove bottom surface and the raised end surface.

[0017] As a preferred solution, a guide groove extending axially along the drive rod is provided at the bottom of the valve body, a bearing or a sleeve is provided in the guide groove, and the drive rod is inserted into the bearing or the sleeve; a drive mechanism connected to the drive rod is provided at the top of the valve body, and when the drive rod drives the upper sealing cover to move downward to open the upper valve port, the lower sealing cover is pushed downward synchronously by adjusting the cover plate to open the lower valve port.

[0018] The technical solution of the present invention has the following advantages compared with the prior art:

[0019] 1. In the valve with a double sealing cover structure provided by the present invention, when the gas valve is powered off and closed, the lower sealing cover is driven upward by the first spring to close the lower valve port, and the second spring applies a force to the adjusting cover plate to drive the upper sealing cover to close the upper valve port. The lower sealing cover and the adjusting cover plate can move relative to each other along the axial direction of the driving rod, and the adjusting cover plate and the sealing cover form a linkage match through the driving rod. Therefore, if there is an installation distance deviation between the two sealing covers and the two valve ports and a sealing match cannot be formed, the adjusting cover plate and the lower sealing cover will move relative to each other under the action of the spring to achieve the effect of adaptive displacement adjustment, thereby adjusting the upper and lower relative distance between the upper sealing cover and the lower sealing cover, and by providing a first sealing ring between the adjusting cover plate and the lower sealing cover, the sealing property of the connection between the two can be ensured. In this design, the relative distance between the two sealing covers can be adaptively adjusted according to the distance between the two valve ports, ensuring that the upper and lower sealing covers are independently sealed to the upper and lower valve ports by the first spring and the second spring, respectively, thereby avoiding gas leakage accidents between the two sealing covers and the two valve ports, improving the sealing performance of the product, and being safe and reliable to use.

[0020] 2. In the valve with a double sealing cover structure provided by the present invention, the lower sealing cover is designed to be annular and has a center hole for the driving rod to pass through, and the bottom side of the adjusting cover is exposed at the center hole position, so that the second spring abuts against the bottom side of the adjusting cover through the center hole, and a position space is left for the installation connection between the second spring and the adjusting cover through the center hole, so that the lower sealing cover and the adjusting cover can achieve the purpose of relative displacement adjustment under the action of the two springs. This structural arrangement transmits the force of the second spring to the upper sealing cover through the adjusting cover, so as to achieve independent sealing of the upper valve port by the upper sealing cover, and independent sealing of the lower valve port by the lower sealing cover with the help of the force of the first spring.

[0021] 3. In the valve with a double sealing cover structure provided by the present invention, a limit pad is fixedly provided on the driving rod and limited at the top of the upper sealing cover, and a supporting sleeve is arranged between the upper sealing cover and the adjusting cover plate. The supporting sleeve not only limits the relative position and installation distance between the adjusting cover plate and the upper sealing cover, but also plays a role in transmitting movement and force between the adjusting cover plate and the upper sealing cover. According to the second spring, which abuts against the bottom side of the adjusting cover plate, the adjusting cover plate, the supporting sleeve and the upper sealing cover are kept in close connection under the action of the spring force, and the spring force is transmitted from one side of the adjusting cover plate through the supporting sleeve to the upper sealing cover to ensure the pressure when the upper sealing cover closes the upper valve port. In this way, the linkage cooperation of the adjusting cover plate and the upper sealing cover on the driving rod can be realized, and the purpose of relative displacement adjustment between the upper and lower sealing covers can be realized. The installation structure is simple and the cooperation is reliable, thereby improving the performance of the gas valve.

[0022] 4. In the valve with a double sealing cover structure provided by the present invention, the driving rod is passed through two mounting through holes oppositely arranged on the upper sealing cover and the adjusting cover plate. The mounting through hole is designed to be divided into a first hole portion, a second hole portion and a third hole portion with successively increasing apertures, wherein the first hole portion is just adapted to the size of the driving rod, and the third hole portion is adapted to the size of the supporting sleeve. A second sealing ring for sealing and connecting the driving rod is provided in the second hole portion, and then the two ends of the supporting sleeve are respectively inserted into the third hole portions of the two mounting through holes. Such an installation can prevent the second sealing ring from detaching from the mounting through hole, and plays a role in limiting the installation of the second sealing ring in the mounting through hole. In this structural arrangement, at least two second sealing rings are respectively provided in the two mounting through holes, thereby respectively realizing the connection seal between the upper sealing cover and the adjusting cover plate and the driving rod.

[0023] 5. In the valve with a double sealing cover structure provided by the present invention, when the upper and lower sealing covers respectively close the upper and lower valve ports, an adjustment gap is formed through adaptive movement adjustment between the lower sealing cover and the adjustment cover plate. The adjustment gap is designed to exist. With this structural arrangement, the installation distance tolerance requirement between the upper and lower sealing covers and the upper and lower valve ports can be met through the adjustment gap. The adjustment distance of the two sealing covers moving up and down is limited according to the spacing of the adjustment gap, that is, the relative distance between the two sealing covers is adjusted to adapt to the relative distance between the two valve ports, thereby achieving the effect that the two sealing covers can independently seal the two valve ports to prevent gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art are briefly introduced below.

[0025] Figure 1 It is a schematic structural diagram of a valve with a double sealing cover structure in an open state according to the present invention;

[0026] Figure 2 It is a schematic structural diagram of a valve with a double sealing cover structure in a closed state according to the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the valve with double sealing cover structure of the present invention after the valve body is hidden;

[0028] Figure 4 It is a schematic diagram of the connection structure between the lower sealing cover and the adjusting cover plate of the present invention;

[0029] Figure 5 It is a schematic diagram of the installation force of the lower sealing cover and the first spring of the present invention;

[0030] Figure 6 It is a schematic diagram of the installation force of the adjustment cover plate and the second spring of the present invention;

[0031] Figure 7 It is a schematic diagram of the installation structure of the adjustment cover plate and the driving rod of the present invention;

[0032] Figure 8 It is a schematic diagram of the installation structure of the upper sealing cover and the driving rod of the present invention;

[0033] Fig. 9 It is a schematic structural diagram of the mounting through hole of the present invention.

[0034] Explanation of the accompanying drawings: 1. valve body; 11. upper valve port; 12. lower valve port; 13. first spring; 14. second spring; 15. annular groove; 16. guide groove; 17. sliding sleeve; 2. driving rod; 3. upper sealing cover; 31. limit pad; 4. lower sealing cover; 40. center hole; 41. circular groove; 42. inner connecting wall; 43. first stop surface; 44. first positioning groove; 5. adjusting cover plate; 51. circular protrusion; 52. outer connecting wall; 53. second stop surface; 54. second positioning groove; 6. supporting sleeve; 7. first sealing ring; 8. second sealing ring; 9. mounting through hole; 91. first hole portion; 92. second hole portion; 93. third hole portion; 100. adjusting gap. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, 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 the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Example

[0040] The present embodiment is described in detail below with reference to the accompanying drawings:

[0041] This embodiment provides Figure 1-Figure 9A valve with a double sealing cover structure shown in the figure comprises a valve body 1, a driving rod 2, a sealing assembly and an elastic assembly, wherein the valve body 1 is provided with an upper valve port 11 and a lower valve port 12 relative to each other, and the driving rod 2 is reciprocatingly arranged in the upper valve port 11 and the lower valve port 12; the sealing assembly comprises an upper sealing cover 3 and an adjusting cover plate 5 which are relatively fixed to the driving rod 2 and form a linkage fit, and a lower sealing cover 4 which is movably sleeved on the driving rod 2 and connected to the lower side of the adjusting cover plate 5, the adjusting cover plate 5 is slidable relative to the lower sealing cover 4 along the axial direction of the driving rod 2, and is suitable for entering and exiting the lower valve port 12, a first sealing ring 7 is tightly arranged between the lower sealing cover 4 and the adjusting cover plate 5, and a sealing connection between the lower sealing cover 4 and the adjusting cover plate 5 is achieved through the first sealing ring 7; the elastic assembly comprises an upper sealing cover 3 and an adjusting cover plate 5 which are arranged between the lower sealing cover 4 and the valve body 1, and a second spring 14 arranged between the regulating cover plate 5 and the bottom of the valve body 1; this valve includes a driving mechanism for driving the driving rod 2 to move, when the valve is opened, the driving rod 2 drives the upper sealing cover 3 to move downward to open the upper valve port 11 under the drive of the driving mechanism, and pushes the lower sealing cover 4 to move downward synchronously through the regulating cover plate 5 to open the lower valve port 12, thereby realizing the double valve port opening of the valve; and when the valve is closed, the driving mechanism cancels the thrust acting on the driving rod, at this time, the lower sealing cover 4 is driven to move upward and close to the lower valve port 12 under the elastic force applied by the first spring 13, and at the same time, the regulating cover plate 5 is driven to move relative to the lower sealing cover 4 under the elastic force applied by the second spring 14, and drives the upper sealing cover 3 to move upward and close to the upper valve port 11, thereby realizing the double valve port closing of the valve.

[0042] In the above embodiment, when the valve is closed, the lower sealing cover 4 is driven to move upward to close the lower valve port 12 by the first spring 13, and the regulating cover plate 5 is applied with a force by the second spring 14 to drive the upper sealing cover 3 to move upward to close the upper valve port 11. The lower sealing cover 4 and the regulating cover plate 5 can move relative to each other along the axial direction of the driving rod 2, and the regulating cover plate 5 and the upper sealing cover form a linkage through the driving rod 2. Therefore, if there is an installation distance deviation between the two sealing covers and the two valve ports and a sealing fit cannot be formed, the regulating cover plate 5 and the lower sealing cover 4 will move relative to each other under the action of the spring. The movement can realize the effect of adaptive displacement adjustment, so as to adjust the upper and lower relative distance between the upper sealing cover 3 and the lower sealing cover 4, and by providing a first sealing ring 7 between the adjusting cover plate 5 and the lower sealing cover 4, the sealing of the connection between the two can be ensured. In this way, the relative distance between the two sealing covers can be adaptively adjusted according to the distance between the two valve ports, so as to ensure that the upper and lower sealing covers can realize independent sealing of the upper and lower valve ports by the first spring 13 and the second spring 14 respectively, so as to avoid gas leakage accidents between the two sealing covers and the two valve ports, improve the sealing performance of the product, and use it safely and reliably.

[0043] Combine the following Figure 3-Figure 7 The specific arrangement between the lower sealing cover and the adjusting cover plate is described in detail:

[0044] The lower sealing cover 4 is connected to the bottom side of the adjusting cover plate 5. The lower sealing cover 4 is annular in structure and has a center hole 40 for the driving rod 2 to pass through, so that the second spring 14 abuts against the bottom side of the adjusting cover plate 5 through the center hole 40. The center hole 40 leaves space for the installation connection of the second spring 14 and the adjusting cover plate 5, so that the lower sealing cover 4 and the adjusting cover plate 5 can achieve the purpose of relative displacement adjustment under the action of the two springs. It is further preferably arranged that the first spring 13 is sleeved on the outside of the second spring 14, and one ends of the first spring 13 and the second spring 14 are jointly arranged in an annular groove 15 arranged at the bottom of the valve body 1, and the lower sealing cover 4 is correspondingly provided with a first positioning groove 44 connected to the other end of the first spring 13, and the adjusting cover plate 5 is correspondingly provided with a second positioning groove 54 connected to the other end of the second spring 14, and the first positioning groove 44 and the second positioning groove 54 are respectively used to position and connect the first spring 13 and the second spring 14. This structural arrangement transmits the action force of the second spring 14 to the upper sealing cover 3 through the adjusting cover plate 5, so as to realize independent sealing of the upper valve port 11 by the upper sealing cover 3, and the lower sealing cover 4 realizes independent sealing of the lower valve port 12 with the help of the action force of the first spring 13.

[0045] Combination Figure 4-Figure 6As shown, the lower sealing cover 4 is slidably connected with the adjustable cover plate 5, and the diameter of the lower sealing cover 4 is larger than the diameter of the adjustable cover plate 5. When the lower sealing cover 4 blocks the lower valve port 12, the adjustable cover plate 5 enters the lower valve port 12, and the sliding distance between the lower sealing cover 4 and the adjustable cover plate 5 is the adjustment distance of the upper sealing cover 3 relative to the lower sealing cover 4. As a preferred embodiment, the lower sealing cover 4 includes a circular groove 41 with an opening toward the adjustable cover plate 5, and the adjustable cover plate 5 includes a circular protrusion 51 slidably connected to the circular groove 41, and an outer connecting wall 52 is formed on the outer side of the circular protrusion 51, and an inner connecting wall 42 that is in sliding contact with the outer connecting wall 52 is formed in the circular groove 41, and the inner connecting wall 42 and the outer connecting wall 52 are respectively in the shape of annular rings, and a first sealing ring 7 is arranged between the outer connecting wall 52 and the inner connecting wall 42, and specifically, a sealing ring suitable for installing the first sealing ring 7 is arranged on the outer connecting wall 52. Sealing groove, the center hole of the lower sealing cover 4 is penetrated in the circular groove 41, so that the second spring 14 passes through the center hole 40 and abuts against the circular protrusion 51 to realize the elastic connection between the adjusting cover plate 5 and the second spring 14. In this structural setting, the lower sealing cover 4 and the adjusting cover plate 5 are slidably connected through the inner connecting wall 42 and the outer connecting wall 52 to realize relative displacement adjustment, thereby playing a role in adjusting the relative distance between the lower sealing cover 4 and the upper sealing cover 3, and the sealing of the sliding contact between the inner connecting wall 42 and the outer connecting wall 52 is realized through the first sealing ring 7 to avoid air leakage.

[0046] like Figure 4 As shown, when the upper and lower sealing covers close the upper and lower valve ports respectively, an adjustment gap 100 is formed by adaptive movement adjustment between the lower sealing cover 4 and the adjustment cover plate 5. The adjustment gap 100 is designed to exist, and its spacing is within 1 mm. It is further preferably set that the lower sealing cover 4 includes a first stop surface 43 and a groove bottom surface connected to the upper and lower sides of the inner connecting wall 42, and the adjustment cover plate 5 includes a second stop surface 53 and a convex end surface connected to the upper and lower sides of the outer connecting wall 52. The adjustment gap 100 includes a first gap formed between the first stop surface 43 and the second stop surface 53, and a second gap formed between the groove bottom surface and the convex end surface. This structural setting can meet the installation distance tolerance requirements between the upper and lower sealing covers and the upper and lower valve ports by adjusting the gap. The adjustment distance of the two sealing covers moving up and down is limited according to the spacing of the adjustment gap 100, that is, by adjusting the relative distance between the two sealing covers to adapt the relative distance between the two valve ports, so as to achieve the effect that the two sealing covers can independently seal the two valve ports to prevent gas leakage.

[0047] Combine the following Figure 6-Figure 9The specific arrangement of the adjusting cover plate 5 and the upper sealing cover 3 is described in detail:

[0048] The upper sealing cover 3 and the adjusting cover plate 5 are kept in fixed relative position on the driving rod 2 by a connecting structure, and the connecting structure includes: a limiting pad 31 fixed to the driving rod 2 and abutting against the top of the upper sealing cover 3, and a supporting sleeve 6 abutting against the upper sealing cover 3 and the adjusting cover plate 5, the supporting sleeve 6 is sleeved on the driving rod 2, and the adjusting cover plate 5 is kept in close contact with the supporting sleeve 6 under the action of the second spring 14, so that the upper sealing cover 3 is limited between the limiting pad 31 and the supporting sleeve 6, such limiting pad is an aluminum pad and is fixed to the driving rod 2 by a retaining spring, and the supporting sleeve 6 is an aluminum sleeve with a hollow structure. The advantage of such a design is that through the supporting sleeve It not only defines the relative position and installation distance between the adjusting cover plate 5 and the upper sealing cover 3, but also plays the role of transmitting motion and force between the adjusting cover plate and the upper sealing cover. According to the second spring 14, which is in contact with the bottom side of the adjusting cover plate 5, the adjusting cover plate 5, the supporting sleeve 6 and the upper sealing cover 3 are kept in close connection under the action of the spring force, and the elastic force of the second spring 14 is transmitted from one side of the adjusting cover plate to the upper sealing cover 3 through the supporting sleeve to ensure the pressure when the upper sealing cover 3 closes the upper valve port. This arrangement realizes the linkage cooperation between the adjusting cover plate 5 and the upper sealing cover 3 on the driving rod 2, and at the same time can achieve the purpose of relative displacement adjustment between the upper and lower sealing covers. The installation structure is simple, the cooperation is reliable, and the valve performance is improved.

[0049] It is further preferred that the upper sealing cover 3 and the adjusting cover plate 5 are respectively provided with two mounting through holes 9 for the driving rod 2 to pass through, Fig. 9The mounting through hole 9 includes a first hole portion 91, a second hole portion 92 and a third hole portion 93 with successively increasing apertures. A limiting step is formed between the second hole portion 92 and the first hole portion 91. The second hole portion 92 is provided with at least one second sealing ring 8 that is sealingly connected to the driving rod 2. The second sealing ring 8 is sleeved on the driving rod 2 and accommodated in the second hole portion 92. The support sleeve 6 is matched and inserted into the third hole portion 93, so that the second sealing ring 8 is blocked on both sides by the limiting step and the support sleeve 6. The advantage of such a design is that, according to the first hole portion 91 being exactly adapted to the size of the driving rod 2, and the third hole portion 93 being adapted to the size of the supporting sleeve 6, the second sealing ring 8 is arranged in the second hole portion 92 to achieve sealing contact with the driving rod 2, and the two ends of the supporting sleeve 6 are respectively inserted into the third hole portions 93 of the two mounting through holes 9. Such an installation can prevent the second sealing ring 8 from escaping from the mounting through holes 9, and plays a role in limiting the installation of the second sealing ring 8 in the mounting through holes 9. Such a structural arrangement, by respectively arranging the second sealing ring 8 in the mounting through holes of the upper sealing cover 3 and the adjusting cover plate 5, thereby respectively achieving a sealed connection between the upper sealing cover 3 and the adjusting cover plate 5 and the driving rod 2, thereby avoiding gas leakage.

[0050] The valve in this embodiment is a gas valve, which includes a driving mechanism arranged on the top of the valve body and connected to the driving rod 2. This driving mechanism can adopt an electromagnetic driving mechanism composed of a coil structure, a static iron core and a moving iron core, or a cylinder mechanism. When the electromagnetic driving mechanism is energized, it drives the driving rod 2 to move downward, and the driving rod 2 drives the upper sealing cover 3 to move downward to open the upper valve port 11, and pushes the lower sealing cover 4 to move downward synchronously by adjusting the cover plate 5 to open the lower valve port 12. In order to improve the stability and accuracy of the reciprocating motion of the drive rod 2 in the valve body 1, a guide groove 16 extending axially along the drive rod 2 is provided at the bottom of the valve body, and a bearing or a sleeve 17 is provided in the guide groove 16. The drive rod 2 is inserted into the bearing or the sleeve 17. In addition, a bearing or a sleeve 17 for the drive rod 2 to pass through is provided at the top of the valve body 1. This structural setting is conducive to reducing the friction resistance between the drive rod 2 and the valve body 1 through the bearing or the sleeve 17, and also plays a lubricating role, thereby reducing mechanical wear and extending the service life. In addition, the bearing or the sleeve 17 plays a good motion guiding role for the drive rod 2, avoiding the shaking and deviation of the drive rod during the movement, and ensuring the stability and reliability of the movement of the drive rod.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A valve with a double sealing cover structure, comprising: A valve body (1) is provided with an upper valve port (11) and a lower valve port (12) opposite to each other; A driving rod (2) is reciprocatably disposed in the upper valve port (11) and the lower valve port (12); It is characterized by further comprising: A sealing assembly, comprising an upper sealing cover (3) and an adjusting cover plate (5) which are fixed to the driving rod (2) and form a linkage, and a lower sealing cover (4) which is movably sleeved on the driving rod (2) and connected to the lower side of the adjusting cover plate (5); the adjusting cover plate (5) is slidable relative to the lower sealing cover (4) along the axial direction of the driving rod (2) and is suitable for entering and exiting the lower valve port (12); a first sealing ring (7) is tightly arranged between the lower sealing cover (4) and the adjusting cover plate (5); The elastic component comprises a first spring (13) arranged between the lower sealing cover (4) and the bottom of the valve body (1), and a second spring (14) arranged between the regulating cover plate (5) and the bottom of the valve body (1); the lower sealing cover (4) is driven by the elastic force applied by the first spring (13) to move upward and close at the lower valve port (12); the regulating cover plate (5) is driven by the elastic force applied by the second spring (14) to move relative to the lower sealing cover (4) and drive the upper sealing cover (3) to move upward and close at the upper valve port (11); The lower sealing cover (4) comprises a circular groove (41) opening toward the adjusting cover plate (5); the adjusting cover plate (5) comprises a circular protrusion (51) slidably connected to the circular groove (41); an outer connecting wall (52) is formed on the outer side of the circular protrusion (51); an inner connecting wall (42) slidably contacting with the outer connecting wall (52) is formed inside the circular groove (41); and a first sealing ring (7) is provided between the outer connecting wall (52) and the inner connecting wall (42); The center hole of the lower sealing cover (4) is arranged to penetrate the circular groove (41), the second spring (14) passes through the center hole (40) and abuts against the circular protrusion (51), and an adjustment gap (100) is formed between the lower sealing cover (4) and the adjustment cover plate (5).

2. The valve with double sealing cover structure according to claim 1, characterized in that: The lower sealing cover (4) is slidably connected to the adjustment cover plate (5), and the sliding distance between the lower sealing cover (4) and the adjustment cover plate (5) is the adjustment distance of the upper sealing cover (3) moving relative to the lower sealing cover (4).

3. The valve with double sealing cover structure according to claim 1, characterized in that: The lower sealing cover (4) is connected to the bottom side of the adjusting cover plate (5) in a matching manner. The lower sealing cover (4) is an annular structure and has a central hole (40) through which the driving rod (2) can pass, so that the second spring (14) abuts against the bottom side of the adjusting cover plate (5) through the central hole (40).

4. The valve with double sealing cover structure according to claim 3, characterized in that: The first spring (13) is sleeved on the outside of the second spring (14); one end of the first spring (13) and the second spring (14) are jointly arranged in an annular groove (15) arranged at the bottom of the valve body; the lower sealing cover (4) is correspondingly provided with a first positioning groove (44) connected to the other end of the first spring (13); and the regulating cover plate (5) is correspondingly provided with a second positioning groove (54) connected to the other end of the second spring (14).

5. The valve with a double sealing cover structure according to any one of claims 1 to 4, characterized in that: The upper sealing cover (3) and the adjusting cover plate (5) are kept in fixed relative position on the driving rod (2) by a connecting structure, wherein the connecting structure comprises: a limit pad (31) fixed to the driving rod (2) and abutting against the top of the upper sealing cover (3), and a supporting sleeve abutting against the upper sealing cover (3) and the adjusting cover plate (5), wherein the supporting sleeve is sleeved on the driving rod (2), and the adjusting cover plate (5) is kept in close contact with the supporting sleeve (6) under the action of a second spring (14).

6. The valve with double sealing cover structure according to claim 5, characterized in that: The upper sealing cover (3) and the regulating cover plate (5) are respectively provided with two mounting through holes (9) for the driving rod (2) to pass through, the mounting through hole (9) comprising a first hole portion (91), a second hole portion (92) and a third hole portion (93) with successively increasing hole diameters, a limiting step is formed between the second hole portion (92) and the first hole portion (91), at least one second sealing ring (8) is provided in the second hole portion (92) for sealingly connecting the driving rod (2), the supporting sleeve (6) is matched and inserted into the third hole portion (93), so that the two sides of the second sealing ring (8) are limited and blocked by the limiting step and the supporting sleeve (6).

7. The valve with a double sealing cover structure according to any one of claims 1 to 4, characterized in that: The lower sealing cover (4) comprises a first stop surface (43) connected to the upper and lower sides of the inner connecting wall (42) and a groove bottom surface, the adjustment cover plate (5) comprises a second stop surface (53) connected to the upper and lower sides of the outer connecting wall (52) and a raised end surface, and the adjustment gap (100) comprises a first gap formed between the first stop surface (43) and the second stop surface (53), and a second gap formed between the groove bottom surface and the raised end surface.

8. The valve with double sealing cover structure according to claim 1, characterized in that: The bottom of the valve body (1) is provided with a guide groove (16) extending axially along the drive rod (2), a bearing or a sliding sleeve (17) is provided in the guide groove (16), and the drive rod (2) is inserted into the bearing or the sliding sleeve (17).

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