WO2019011345A1

WO2019011345A1 - Novel dual-sealing dome valve

Info

Publication number: WO2019011345A1
Application number: PCT/CN2018/099540
Authority: WO
Inventors: 俞爱华; 俞杰; 梅一开
Original assignee: 江苏艮德电力设备有限公司
Priority date: 2017-07-13
Filing date: 2018-08-09
Publication date: 2019-01-17
Also published as: CN107202174B; CN107202174A

Abstract

A novel dual-sealing dome valve, comprising a valve body (100), a valve element (200), a valve seat (300), and a valve deck (400), and further comprising a gland (600), wherein one end of the gland is connected to the valve deck (400), and the other end extends out of the inner side face (401) of the valve deck (400) to form a limiting surface (601) and then extends downwards to abut against an outer end face of the valve element when the dome valve is closed, thereby forming a sealing channel (M); a sealing assembly (700), comprising a piston (701) and a sealing gland (702) which are provided in the sealing channel (M) and can move in the sealing channel (M); and an air source channel (800), which extends from an opening of the valve deck (400) to the sealing channel (M) to form an air channel allowing air to flow in and out. By using a metal material to achieve sealing, more reliable performance and a longer service life compared with traditional sealing can be obtained. By means of air source control, air in the piston (701) is exhausted preferentially, so that the valve can be opened after the pressure between the valve element (200) and the piston (701) is reduced, abrasion due to opening of the valve is reduced, the service life of the valve is prolonged, the maintenance period is further shortened, and energy is saved.

Description

A new type of double seal form dome valve

Technical field

The invention belongs to the technical field of valve bodies and relates to a novel double-sealed form dome valve.

Background technique

Ordinary ball valve seals mainly rely on the preload or fluid pressure, the valve seat and the ball are pressed and the valve seat material is elastically plastically deformed to achieve sealing. Since the valve body and the ball body are made of metal material, the valve seat is made of soft non-metal material. When the ball valve is used in a cold or hot working environment, the thermal expansion and contraction are inconsistent due to the different materials of the valve seat and the valve body. Causes leakage of the ball valve during operation or failure of valve opening and closing. The dome valve is the most effective material conveying valve that can be quickly opened and closed in the world. It is also the most important valve used in the international coal-fired power plant ash conveying system, and it is used in the system operation for partitioning and connection. The electric discharge dust hopper and the warehouse pump are cut off, used as the warehouse pump exhaust valve, the delivery discharge door for the unit warehouse pump, the ash storage switching dome valve, the ash storage discharge dome valve and the like. The blanking dome valve causes the ash accumulation in the ash bucket to be quantitatively dropped into the bin pump, and each hopper bucket pump is equipped with a blanking dome valve. Once the dome valve fails, if the treatment is not timely, the ash can not be discharged, the level in the ash bucket is getting higher and higher, and the alarm will be sent after the level gauge is over. Seriously, the ash bucket can be cracked or the electric field can be cut off. It may even cause a unit outage accident. The existing patented structure of the dome valve uses airbag inflation and spherical surface combination to achieve sealing and blocking medium circulation. Since the airbag seal requires gas to expand to achieve the fit with the spherical surface, the innate factor determines that the material and life of the airbag cannot reach the renewal effect of using the industrial ore (the airbag is worn, and the soft material is easily weak and broken under high temperature environment). Even if the airbag is replaced with a fluororubber material, since the medium in the duct is a particulate matter, it is easy to damage the airbag. Due to the poor industrial and mining conditions in many occasions of the power plant, the airbag type soft-sealed dome valve on the market has a short service life in use, and the airbag is required to be replaced in a short period, which is inconvenient for production and maintenance.

The inventor's previously filed application CN201610229392.8 documents a dome valve with a clamped sealing member between the dome valve piston and the sealing gland, which pushes the movement of the piston and the sealing gland by air pressure, The sealing member held between the two is in contact with the valve core to achieve sealing, and the sealing member is sealed with a hard pad (for example, engineering plastic), which has more reliable performance and life than the conventional sealing, but the material is compared with the metal. The material is more prone to wear, and when the dome valve is closed from the open position to the open position, the existing dome valve is synchronized with the opening of the ball valve, so that the sealing surface is easily broken, and the air pressure existing in the piston makes the sealing member There is a pressure of contact with the valve core, which increases the wear of the sealing member, thereby reducing its life.

Summary of the invention

The purpose of this section is to summarize some aspects of the embodiments of the invention and to briefly describe some preferred embodiments. The simplifications or omissions may be made in this section as well as in the description of the invention and the invention, and the scope of the invention is not to be construed as limiting the scope of the invention.

The present invention has been made in view of the above or the problems existing in existing dome valves.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel double seal form dome valve of soft and hard seal exhaust which achieves the purpose of cutting the medium by moving the soft and hard seal piston seat to contact the spool.

In order to solve the above problems, the solution is as follows: a novel double seal form dome valve including a valve body, a valve core, a valve seat and a valve cover, the valve core being connected to a shaft member, the shaft member rotating to drive the valve The core moves to open or close the dome valve; the gland has one end connected to the valve cover, and the other end extends beyond the inner side of the valve cover to form a limiting surface, and extends downward to abut when the dome valve is closed An outer end surface of the spool, forming a sealing passage; and a gas source passage extending from the bonnet opening to the sealing passage to form an intake and exhaust passage, and a sealing assembly including a piston and a sealing gland, Disposed in the sealing passage, the piston is made of a metal material and is movable in the sealing passage, and the range of motion is farthest against the limiting surface, and recently touches the outer end surface.

A preferred embodiment of the novel double seal form dome valve according to the present invention, wherein: the piston and the sealing gland are disposed separately, and the sealing gland passes through the connecting member and the piston Connected.

A preferred embodiment of the novel double-sealed form dome valve according to the present invention, wherein: the piston is provided with a concave passage, and the sealing gland and the concave passage form a notch limit space, and A sealing member is disposed in the limiting space, and a portion of the sealing member protruding from the notch interferes with the outer end surface.

A preferred embodiment of the novel double seal form dome valve according to the present invention, further comprising: a gas source control unit comprising a support assembly, a reversing valve, a communication assembly and an air control assembly; a shaft member connection, wherein the reversing valve is disposed, one end of the reversing valve is in communication with the air source passage, and the other end of the reversing valve is connected to the air control assembly through the communication component, and the gas A control assembly controls the switch of the reversing valve.

A preferred embodiment of the novel double seal form dome valve according to the present invention, wherein: the air control assembly further comprises a gas source interface and a control valve, and a passage interface disposed on one end of the reversing valve is passed through the conduit a piston interface connection, the piston interface is connected to the air source passage, and the other end is connected to the air source flow interface through the communication component; the air source interface is disposed at an upper end of the reversing valve, the control valve After the cam is in contact with the cam, the air source is turned on to the inside of the interface to complete the opening and closing of the air source flow to the interface and the reversing valve.

A preferred embodiment of the novel double-sealed form dome valve according to the present invention, wherein: a lower limit projection is disposed at a lower end of the valve cover, and the sealing assembly is at the limiting surface and the limiting protrusion The movement creates a seal.

A preferred embodiment of the novel double seal form dome valve according to the present invention, wherein: the shaft member includes an upper shaft and a lower shaft, and the upper shaft and the lower shaft are connected to the valve core through a turntable .

A preferred embodiment of the novel double seal form dome valve according to the present invention, wherein: the valve cover is a boss structure, and the air source passage extends from the side of the boss structure and then extends to the The bottom of the boss structure is in communication with the sealed passage.

A preferred embodiment of the novel double-sealed form dome valve according to the present invention, wherein: a lower portion of the piston protrudes into a portion to be in contact with an outer end surface of the valve body, and the sealing gland is The lower end portion is in contact with the outer end surface of the valve body, and the lower end of the piston is further provided with an open groove near the abutting portion.

As a preferred embodiment of the novel double-sealed form dome valve according to the present invention, the piston is made of stellite alloy and has a friction coefficient of 0.18 to 0.20.

Advantageous Effects of Invention: The present invention provides a novel double-sealed form dome valve of a hard-sealed exhaust gas, which achieves the purpose of cutting a medium by moving the soft and hard-sealed piston valve seat to contact with the valve core. The use of metal materials (surfacing welder) has a more reliable performance and longevity than conventional seals, greatly reducing the number of post-maintenances and thus reducing costs. The piston enters and exits the exhaust port, and the exhaust port is evenly distributed, which can effectively inflate and exhaust quickly, so that the air pressure at each point in the piston is kept uniform during the inflation process, and the dome valve is quickly operated. By gas source control, the gas in the piston is preferentially eliminated, the pressure between the valve core and the piston can be reduced, and then the valve is opened, which reduces the wear and tear on the valve opening, increases the service life, further reduces the maintenance period, and saves energy. At the same time, through the mutual interference structure provided between the sealing gland and the outer end surface of the valve core, in the process of opening and closing the valve, the outer end surface of the valve core can be scraped, thereby ensuring good sealing performance.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any inventive labor. among them:

1 is a schematic view showing the overall structure of a novel double-sealed dome valve according to a first embodiment of the present invention;

2 is an enlarged schematic view showing a partial structure of a novel double-sealed dome valve of the embodiment shown in FIG. 1 according to the present invention;

3 is a cross-sectional view and a partially enlarged structural view of a novel double-sealed dome valve according to another embodiment of the present invention;

Figure 4 is a schematic view showing the structure of a seal of a novel double-sealed dome valve according to the first embodiment of the present invention;

Figure 5 is a cross-sectional structural view of the gas source passage in an embodiment of the present invention;

6 is a cross-sectional structural view showing a novel double-sealed dome valve according to still another embodiment of the present invention, wherein a sealing assembly is omitted;

Figure 7 is a cross-sectional structural view showing a novel double seal type dome valve of the embodiment shown in Figure 6;

8 is a schematic view showing the overall structure of a gas source control unit in a novel double-sealed dome valve according to still another embodiment of the present invention;

9 is a schematic enlarged structural view of a gas source interface in the embodiment shown in FIG. 8 according to the present invention;

10 is a schematic structural view of an air control assembly of a novel double seal form dome valve according to the embodiment shown in FIG. 8;

Figure 11 is a schematic view showing the structure of removing a cam in the air control assembly of a novel double-sealed dome valve according to the embodiment shown in Figure 10;

12 is a schematic view showing the structure of a channel interface of a novel double-sealed dome valve according to an embodiment of the present invention.

Detailed ways

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims.

In the following description, numerous specific details are set forth in order to provide a full understanding of the present invention, but the invention may be practiced in other ways than those described herein, and those skilled in the art can do without departing from the scope of the invention. The invention is not limited by the specific embodiments disclosed below.

In addition, "an embodiment" or "an embodiment" as used herein refers to a particular feature, structure, or characteristic that can be included in at least one implementation of the invention. The appearances of the "in one embodiment", "a" or "an"

Secondly, the present invention will be described in detail in conjunction with the accompanying drawings. When the embodiments of the present invention are described in detail, for the convenience of description, the sectional view of the structure of the device will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, and should not be used here. Limit the scope of protection of the invention. In addition, the actual three-dimensional dimensions of length, width and depth should be included in the actual production.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Example 1:

As shown in Fig. 1, Fig. 1 shows a schematic view of the main structure of a novel double seal form dome valve. Dome valves are often used on gas-solid two-phase injection or delivery pipes and tanks for shut-off or shut-off. The novel double seal form dome valve in this embodiment includes a valve body 100, a valve body 200 disposed inside the valve body 100, an annular valve seat 300, and a valve cover 400 disposed on the valve seat 300. The spool 200 is fixedly coupled to the shaft member 500 by screws, and the shaft member 500 moves the spool 200 by rotation to realize opening or closing of the novel double-sealed dome valve. In order to better realize the sealing of the novel double seal form dome valve, referring to FIG. 2 and FIG. 3, in this embodiment, the novel double seal form dome valve further includes a gland 600 with one end and a bonnet. 400 is fixedly connected by screws, and the other end extends beyond the inner side surface 401 of the valve cover 400 to form a limiting surface 601, and extends downward to abut the outer end surface 201 of the valve body 200 when the novel double sealing form dome valve is closed, forming a seal. Channel M, which ultimately serves to seal the seal assembly 700 when the medium is cut off for a new dual seal form dome valve. The seal assembly 700 indicated herein is disposed within the seal passage M and is movable within the seal passage M, the range of motion being most far to the limit surface 601 of the gland 600, most recently resisting the outer end surface 201 of the spool 200. The sealing assembly 700 includes a piston 701 and a sealing gland 702. The piston 701 and the sealing gland 702 are separately disposed. The sealing gland 702 is fixedly connected to the piston 701 through the connecting member 703. Synchronous piston movement is performed in the sealed passage M. Further, a certain portion of the lower end of the piston 701 protrudes into contact with the outer end surface 201 of the valve body 200, and when the novel double seal form dome valve is in the closed position, the portion extending from the lower end of the sealing gland 702 and the spool The outer end faces 201 of the cylinders 200 are in contact with each other, and the outer end surface 201 of the valve body 200 is rotated during the opening or closing of the valve body 200, and the mutually incompatible portions during the rotation process are in contact with each other due to contact and relative movement. The material remaining on the outer end surface 201 of the valve body 200 can be scraped off, thereby functioning as a scraping material, and the novel double-sealed form dome valve has better sealing performance.

In this embodiment, the material of the piston 701 is made of a special material, which is made of stellite alloy surfacing. The stellite alloy is a hard alloy which is resistant to various types of wear and corrosion and high temperature oxidation, that is, Commonly referred to as cobalt chromium tungsten (molybdenum) alloy or cobalt-based alloy, stellite alloy is based on cobalt, containing a considerable amount of nickel, chromium, tungsten and a small amount of alloys such as molybdenum, niobium, tantalum, titanium and niobium. Elements, and occasionally iron-containing alloys, which can be made into welding wire according to the composition of the alloy. The powder is used for hard surface surfacing, thermal spraying, spray welding, etc., and can also be used for casting and forging parts and powder metallurgy parts. In the present embodiment, it is made by surfacing welding, and has high temperature and corrosion resistance, and the friction coefficient of the piston 701 finally obtained is between 0.18 and 0.20. Preferably, the piston 701 having a contact surface with the outer end surface 201 of the valve body 200 has a smoothness of 0.4 μm to 0.8 μm, and the outer end surface 201 of the valve body 200 which is in contact with the piston 701 has a smoothness of 0.4 μm to 0.8. Mm. In this way, the sealing can be better completed, and the material wear caused by the conflict is reduced, thereby reducing the number of repairs, prolonging the service life, saving cost and energy.

During this process, the spool 200 does not make any contact with the valve body 100. Of course, in this embodiment, the novel dual seal form dome valve is also provided with a gas source passage 800 that extends from the opening of the bonnet 400 to the passage of the seal passage M to form intake and exhaust. Preferably, as shown in FIG. 4, when the valve cover 400 is a boss structure, the air source passage 800 is opened from the side surface of the boss structure and then extends to the bottom of the boss structure to communicate with the sealing passage M, and In order to balance the inflation setting, the air source passage 800 is set to two channels that are vertically symmetrical. Thus, when the external air source is inflated into the novel double-sealed dome valve through the air source passage 800, the shaft member 500 drives the spool 200 to rotate 90° to cut off the medium passage. At this time, the seal assembly 700 is forced by the air pressure. The sealing assembly 700 resists sealing to the outer end surface 201 of the valve core 200, and isolates various shapes of particles in the gap. The new double-sealed dome valve is completely closed; when the new double-sealed dome valve is opened, the sealing channel M is closed. The compressed air (or nitrogen) is released from pressure, and is retracted by itself, and then the spool 200 is rotated 90° to the open position. Since the spool 200 is not in contact with the seal assembly 700, the opening of the novel double-sealed dome valve is realized. Moreover, the opening and closing torque is small and the wear is small, thereby improving the service life and greatly reducing the maintenance cost and time.

Example 2:

As shown in FIGS. 5 and 6, and referring to FIGS. 1 to 4, the novel double-sealed form dome valve in this embodiment includes a valve body 100, and a valve body 200 disposed inside the valve body 100. The annular valve seat 300 and the valve cover 400 disposed on the valve seat 300, wherein the valve core 200 is fixedly coupled to the shaft member 500 by screws, and the shaft member 500 moves the spool 200 by rotation to realize a novel double seal form. The dome valve is opened or closed. Here, in order to better realize the opening and closing of the novel double seal form dome valve, the shaft member 500 includes an upper shaft 501 and a lower shaft 502, and the upper shaft 501 and the lower shaft 502 are connected to the spool 200 through the arm disc 503. Thereby, the movement of the spool 200 is achieved. In order to better realize the sealing of the novel double seal form dome valve, referring to FIG. 2 and FIG. 3, in this embodiment, the novel double seal form dome valve further includes a gland 600 with one end and a bonnet. 400 is fixedly connected by screws, and the other end extends beyond the inner side surface 401 of the valve cover 400 to form a limiting surface 601, and extends downward to abut the outer end surface 201 of the valve body 200 when the novel double sealing form dome valve is closed, forming a seal. Channel M, which ultimately serves to seal the seal assembly 700 when the medium is cut off for a new dual seal form dome valve. In this embodiment, there is actually a limit structure, that is, a limiting protrusion 402 disposed at the lower end of the valve cover 400, the limiting protrusion 402 can limit the range of motion of the sealing assembly 700 and prevent sealing. The assembly 700 is "shed" such that the seal assembly 700 moves between the stop face 601 and the limit projection 402 to form a seal. The seal assembly 700 indicated herein is disposed within the seal passage M and is movable within the seal passage M, the range of motion being most far to the limit surface 601 of the gland 600, most recently resisting the outer end surface 201 of the spool 200. In order to better achieve the sealing and prevent the leakage of the gas after the inflation, a soft seal is also provided in the embodiment. Specifically, a limited space is provided at the connection end of the piston 701 and the sealing gland 702, which is the piston 701. A concave channel is provided, and the concave channel is limited by the sealing gland 702 of the connecting end to form a limiting space with a notch, and the sealing member S is disposed in the limiting space, and the sealing member S is limited by the sealing gland 702 In the limiting space, the portion of the sealing member S protruding from the notch in the limiting space is in contact with the outer end surface 201 of the valve body 200, and the outer end surface 201 is softly sealed to form a soft and hard seal with the hard seal of the piston 701. The combined double seal is formed. Of course, in the embodiment, the manner of limiting the space between the concave passage and the sealing gland 702 to form a limiting space is preferred, and other forms may be used. For example, the piston 701 is directly disposed to receive the sealing member. The limiting space of the S, and the limiting space does not interact with the sealing gland 702, and can directly limit the sealing member S to the limiting space with the notch, and the protruding portion and the outer end surface 201 are in contact with each other. The sealing member S is a special soft material sealing ring, and when the new double sealing form dome valve is in operation, the hard valve seat will be damaged if the card is stuck to the metal tubular object, and the valve can still achieve zero leakage. Therefore, it can be combined with the sealing member 700 of the hard material to form a soft and hard joint double seal form, thereby improving the sealing performance of the dome valve, for example, the material is fluororubber, and the fluororubber refers to the carbon atom of the main chain or the side chain. A synthetic polymeric elastomer containing a fluorine atom; the introduction of a fluorine atom imparts excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and weather resistance to the rubber, further preventing leakage of the material, and is located at the dome The joint between the valve body 100 of the valve, the valve seat 300, the valve cover 400 and the gland 600 is provided with a rubber ring to enhance the sealing performance between the joints of the components, thereby improving the sealing performance of the dome valve. Preferably, the piston 701 is made of a metal alloy and is sealed with the outer end surface 201 of the valve body 200 to form a seal, so that the sealing effect is better. Seal assembly 700 includes a piston 701 and a sealing gland 702. Preferably, the piston 701 and the sealing gland 702 are separately disposed, and the sealing gland 702 is fixedly connected to the piston 701 through the connecting member 703. The sealing gland 702 is not in contact with the outer end surface 201 of the valve body 200, and when the novel double sealing form dome valve is in the closed position, the portion extending from the lower end of the sealing gland 702 and the outer end surface 201 of the valve body 200 are mutually In contrast, during the process of opening or closing the spool 200, since the outer end surface 201 of the spool 200 is rotated, the mutually incompatible portions during the rotation can remain in the spool due to contact and relative movement. The material of the outer end surface 201 of the 200 is scraped off, thereby functioning as a scraping material to ensure a better sealing performance of the novel double-sealed dome valve. Preferably, the piston 701 and the sealing gland 702 are connected by eight connecting members 703, wherein the connecting member 703 is a bolt, and eight bolts are evenly distributed on the side of the sealing gland 702 to form a circumference for fastening. the goal of.

In this embodiment, the material of the piston 701 is made of a special material, which is made of stellite alloy surfacing. The stellite alloy is a hard alloy which is resistant to various types of wear and corrosion and high temperature oxidation, that is, Commonly referred to as cobalt chromium tungsten (molybdenum) alloy or cobalt-based alloy, stellite alloy is based on cobalt, containing a considerable amount of nickel, chromium, tungsten and a small amount of alloys such as molybdenum, niobium, tantalum, titanium and niobium. Elements, and occasionally iron-containing alloys, which can be made into welding wire according to the composition of the alloy. The powder is used for hard surface surfacing, thermal spraying, spray welding, etc., and can also be used for casting and forging parts and powder metallurgy parts. In the present embodiment, it is made by surfacing welding, and has high temperature and corrosion resistance, and the friction coefficient of the piston 701 finally obtained is between 0.18 and 0.20. Preferably, the piston 701 having a contact surface with the outer end surface 201 of the valve body 200 has a smoothness of 0.4 μm to 0.8 μm, and the outer end surface 201 of the valve body 200 which is in contact with the piston 701 has a smoothness of 0.4 μm to 0.8. Mm. In this way, the sealing can be better accomplished and the material wear caused by the conflict can be reduced, thereby reducing the number of repairs, prolonging the service life, saving cost and energy.

As described above, in the above description of the working state of the novel double-sealed dome valve, it is not difficult to find that the novel double-sealed form dome valve has the valve core 200 and the valve body 100 when the valve is opened or closed during material conveying. There is no direct contact between them, which effectively solves the hard friction between each other, prolongs the service life of the valve core 200, and strengthens the new double-sealed form of the dome valve by using the rigid sealing assembly 700 for sealing. At the same time of sealing, the service life of the new double-sealed dome valve is also extended as a whole, which greatly meets the needs of the production process and ensures the safety of the person and equipment.

Example 3:

As shown in FIGS. 5 and 6, and referring to FIGS. 1 to 4, the novel double-sealed form dome valve in this embodiment includes a valve body 100, and a valve body 200 disposed inside the valve body 100. The annular valve seat 300 and the valve cover 400 disposed on the valve seat 300, wherein the valve core 200 is fixedly coupled to the shaft member 500 by screws, and the shaft member 500 moves the spool 200 by rotation to realize a novel double seal form. The dome valve is opened or closed. Here, in order to better realize the opening and closing of the novel double seal form dome valve, the shaft member 500 includes an upper shaft 501 and a lower shaft 502, and the upper shaft 501 and the lower shaft 502 are connected to the spool 200 through the arm disc 503. Thereby, the movement of the spool 200 is achieved. In order to better realize the sealing of the novel double seal form dome valve, referring to FIG. 2 and FIG. 3, in this embodiment, the novel double seal form dome valve further includes a gland 600 with one end and a bonnet. 400 is fixedly connected by screws, and the other end extends beyond the inner side surface 401 of the valve cover 400 to form a limiting surface 601, and extends downward to abut the outer end surface 201 of the valve body 200 when the novel double sealing form dome valve is closed, forming a seal. Channel M, which ultimately serves to seal the seal assembly 700 when the medium is cut off for a new dual seal form dome valve. In this embodiment, there is actually a limit structure, that is, a limiting protrusion 402 disposed at the lower end of the valve cover 400, the limiting protrusion 402 can limit the range of motion of the sealing assembly 700 and prevent sealing. The assembly 700 is "shed" such that the seal assembly 700 moves between the stop face 601 and the limit projection 402 to form a seal. The seal assembly 700 indicated herein is disposed within the seal passage M and is movable within the seal passage M, the range of motion being most far to the limit surface 601 of the gland 600, most recently resisting the outer end surface 201 of the spool 200. In order to better achieve the sealing and prevent leakage of gas after inflation, a sealing member S is provided between the sealing assembly 700 and the inner side surface 401 of the valve cover 400 and the ring side surface 602 of the gland 600, which is made of a special soft material. The sealing ring, and when the new double-sealed dome valve is in operation, it will damage the hard valve seat when it is stuck to the metal tubular object, and the valve can still achieve zero leakage. Therefore, it can be combined with the hard material sealing assembly 700. The combination of soft and hard combined double sealing forms improves the sealing performance of the dome valve, for example, the material is fluororubber, and the fluororubber refers to a synthetic polymeric elastomer containing fluorine atoms on the carbon atoms of the main chain or side chains; The introduction of the rubber imparts excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and weather resistance to the rubber, further preventing the leakage of the material. Preferably, the piston 701 is made of a metal alloy and is sealed with the outer end surface 201 of the valve body 200 to form a seal, so that the sealing effect is better. Seal assembly 700 includes a piston 701 and a sealing gland 702. Preferably, the piston 701 and the sealing gland 702 are separately disposed, and the sealing gland 702 is fixedly connected to the piston 701 through the connecting member 703. And when the novel double seal form dome valve is in the closed position, the portion of the lower end of the seal gland 702 extends against the outer end surface 201 of the valve body 200, and the valve core 200 is in the process of opening or closing due to the valve. The outer end surface 201 of the core 200 is rotated, and the mutually incompatible portions during the rotation process can scrape off the material remaining on the outer end surface 201 of the valve body 200 due to the contact and relative movement, thereby scraping the material. The utility model ensures that the novel double-sealed dome valve has better sealing performance. At the same time, in the embodiment, as shown in FIG. 3, a certain portion of the lower end of the piston 701 protrudes into contact with the outer end surface 201 of the valve body 200. And the lower end portion of the sealing gland 702 and the outer end surface 201 of the valve body 200 are in contact with each other, and the lower end of the piston 701 is further provided with an opening groove 701a near the abutting portion, and the opening groove 701a is disposed as a buffer during the scraping process. The function of the material prevents the ball valve from suddenly jumping during the operation, thereby causing certain damage to the ball valve, reducing the service life of the ball valve and increasing the maintenance cost of the product. Preferably, the piston 701 and the sealing gland 702 are connected by eight connecting members 703, and the eight connecting members 703 are evenly distributed on the side of the sealing gland 702 to form a circumference for fastening purposes.

In the present embodiment, in order to solve the problem that the spool 200 is opened and synchronized with the piston exhausting process, when the valve needs to be opened, the existing dome valve has its exhaust gas and the spool 200 opened synchronously, due to the presence of the piston. The air pressure is so easy to pull the sealing surface. Therefore, the air source control unit 900 is further included in the embodiment, and the preferential exhaust in the piston 701 can be realized before the valve core 200 is opened, so that there is no pressure in the piston 701, that is, there is no piston between the piston 701 and the spool 200. Extrusion, when the pressure relief is completed, the valve core 200 is opened, there will be no wear between the two, and the service life of the dome valve is increased due to the loss of the opening of the valve core 200. specific,

Referring to Figures 7-10, the dome valve further includes a gas source control unit 900 including a support assembly 901, a reversing valve 902, a communication assembly 903, an air control assembly 904, and a gas source assembly 905, specifically, a valve A support assembly 901 is disposed on the end frame of the body 100. The air source control unit 900 is fixedly connected to the valve body 100 through the bolt of the support assembly 901. The air supply assembly 905 is fixed on the support assembly 901, and the air source assembly 905 can generate different gases. The source, in this embodiment, is preferably disposed on the support assembly 901, such as an air pump or an air compressor, such as an air pump, that is, an "air pump", which removes air from an enclosed space or adds air from the enclosed space; It is divided into electric air pump, manual air pump and foot air pump; electric air pump power-powered air pump generates air pressure by continuously compressing air through electric power; its working principle is: the engine drives the air pump crankshaft through two V-belts to drive the piston Pumping, the gas is introduced into the air reservoir through the air guiding tube, and on the other hand, the gas cylinder is introduced into the air pump through an air guiding tube. The pressure regulating valve controls the air pressure in the air reservoir. When the air pressure in the air reservoir does not reach the pressure set by the pressure regulating valve, the gas entering the pressure regulating valve from the air reservoir cannot open the pressure regulating valve; When the air pressure in the air cylinder reaches the pressure set by the pressure regulating valve, the gas entering the pressure regulating valve from the air reservoir opens the pressure regulating valve, enters the air passage in the air pump and communicates with the pressure regulating valve, and controls the air pump through the air passage. The air inlet is normally open, so that the air pump operates at an empty load to reduce the power loss and protect the air pump; when the air pressure in the air reservoir is lower than the pressure set by the pressure regulating valve due to the loss, the valve in the pressure regulating valve Returning the position by the return spring, disconnecting the control air path of the air pump, and the air pump restarts the air pumping again. In this cycle, a gas source of different air pressure can be generated to be supplied to the reversing valve 902; and the reversing valve 902 is fixed at The support assembly 901 has one end connected to the piston 701 and the other end communicating with the air control assembly 904. Further, the passage interface 902a disposed on one end of the reversing valve 902 is connected to the piston interface R through a conduit, and the piston interface R communicates with the air source. Channel 80 0, the other end thereof is connected to the air control unit 904 through the communication unit 903, and the air control unit 904 controls the switch of the reversing valve 902. The reversing valve 902 in this embodiment is a pneumatic reversing valve. In the directional control valve, according to the direction of action of the airflow in the valve, it can be divided into a one-way type control valve and a reversing type control valve, such as a pneumatic control reversing valve. The gas pressure is used to move the main spool to change the flow direction of the gas. According to different control methods, it is divided into three types: pressure control, pressure relief control and differential pressure control. Pressurization control means that the applied control signal pressure is gradually Ascending, when the air pressure increases to the operating pressure of the spool, the main valve is reversed; the pressure relief control means that the applied air pressure signal pressure is reduced, and when it is reduced to a certain pressure value, the main valve is changed. The differential pressure control is to make the main spool reversing under the action of the pressure difference between the two ends, and the pneumatically controlled reversing valve is divided into two main forms: the cut-off type and the spool type according to the main valve structure. The method can be divided into air pressure control, electromagnetic control two mechanical control, manual control and time control; according to the switching position of the valve and the number of pipeline ports, it can be divided into several several-way valves; the pneumatic reversing valve in this embodiment passes different The air source enters to change the main spool of the reversing valve 902 Movement, changing the flow direction of the gas therein, achieving preferential discharge of the gas source in the reversing valve 902. And the communication component 903 on the other end of the reversing valve 902 is connected to the air control component 904. The communication component 903 described herein is preferred as a connection between the rigid pipe or the hose and the corresponding outer joint. The structure is connected to the gas, and the output end of the reversing valve 902 is connected to the piston port 701 through the air pipe to the piston 701. The piston port R is connected to the vertical port A on the air source passage 800 to pass the air source. The vertical port A is guided to the horizontal port B, and then the piston 701 is inflated, and the exhausting process is first passed through the horizontal port B, and then the vertical port A is discharged to discharge the gas.

Further, the air control component 904 in this embodiment further includes a gas source interface 904a, a control valve 904b, a gas source flow direction interface 904c, and a cam 904d. Specifically, the gas source interface 904a is an interface for providing a gas source, and the air pressure generated by the compressed air. Provided by an air compressor or an air pump, using compressed air to realize a gas source of different pressures; in this embodiment, the air source interface 904a further includes a gas source interface in two states: an open source interface 904a-1 and a gas shut-off The source interface 904a-2 is respectively a gas source corresponding to the two states of the valve core 200 open and closed, and is input into the reversing valve through the gas source in different states to change the operation of the main spool, thereby realizing the operation in the reversing valve 902. The reversing switch achieves the purpose of gas reversal. And the air source interface 904a is connected to the air source flow to the interface 904c through the joint and the hose, and the air source enters the air source flow into the interface 904c by the air source interface 904a, and the air source flow direction interface 904c includes the first interface 904c-1 and the second The interface 904c-2, wherein the first interface 904c-1 is in communication with the air source interface 904a through a right angle joint, and the second interface 904c-2 is connected to the intake end of the reversing valve 902, and the control valve is connected between the two interfaces. The control of the 904b is inter-operated. In order to achieve synchronization between the control valve 904b and the spool 200, a cam 904d corresponding to the control valve 904b is disposed on the rotating shaft connected to the spool 200, so that when the spool 200 rotates, the cam 904d and the same Synchronous rotation occurs to the corresponding position, which is in conflict with the control valve 904b, triggering the switch. At this time, the connected air source flows to the two interfaces on the interface 904c, and the gas flows from the air source to the interface 904c into the reversing valve 902, and the reversing valve 902 The exhaust end is connected to the piston 701 through the piston interface R, and then the piston 701 is inflated and sealed, which is the process of the piston 701 intake. When the spool 200 needs to be opened, in order to solve the problem that the spool 200 and the piston 701 are synchronized, a control signal is given at this time, and by switching the air source, the air source enters the reversing valve 902, and the reversing valve 902 The main spool is opened, and the gas in the piston 701 is preferentially discharged from the reversing valve 902 to achieve the purpose of pressure relief. When the pressure is released, the valve core 200 is opened, and between the spool 200 and the piston 701. There is no air pressure, that is, there is no pressing force, so the wear between the two is reduced, and the piston 701 is also made of a metal alloy, which further improves the service life, reduces the number of maintenance, and saves energy. In the present embodiment, the pressure sealing process is: first, after the air pump or the air compressor generates the air source of different air pressures, the air source enters the closed air source interface 904a-2, and the air source interface 904a connects the air source to the interface 904c, That is, the air supply source interface 904a-2 is in communication with the first interface 904c-1 through the conduit and the joint. Therefore, after the air source enters the first interface 904c-1, the first interface 904c-1 is coupled to the control valve 904b by the cam 904d. The second interface 904c-2 is electrically connected. The air source enters the intake end of the reversing valve 902 from the second interface 904c-2, and the output end thereof is connected to the piston interface R through the conduit, enters the air source passage 800, and pushes the piston. The movement of 701 seals the dome valve; and the process of releasing pressure is that the control signal gives a pressure relief signal, and the other gas source enters the open source interface 904a-1 and enters the reversing valve 902, thereby reversing The main spool of the valve 902 is operated to open the valve of the reversing valve 902. When the valve of the dome valve needs to be opened, the air source simultaneously enters the reversing valve, and the air source can reach the condition that the ventilation valve 902 is opened. Pressure, so the reversing valve 902 opens, the air source inside the piston To the pressure valve in the emptying-free pressure between the piston 701 and the ball valve element, thus achieving zero air pressure between the spool 200 and the piston 701 is turned on, reducing wear and tear.

Of course, in this embodiment, the reversing valve 902 is also provided with a pressure gauge and a pipe capable of controlling the switching speed of the valve, and a valve feedback annunciator is disposed at the end of the control valve 904b, and the pressure gauge passes through the sensitive components in the table (Bordon) The elastic deformation of the tube, the bellows, and the bellows is transmitted to the pointer by the conversion mechanism of the movement inside the watch, causing the pointer to rotate to display the pressure, and at the same time increasing the speed of the pipe control switching valve switch, which can not only feedback The pressure parameters to valve 902 provide better monitoring of the process and provide protection for the components within the valve. The valve feedback annunciator, feedback the valve's degree of switching back, after the comparison operation, automatically determine the optimal position of the valve opening, to achieve the best state of work.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any technical person skilled in the art within the technical scope disclosed by the present invention, the technical solution according to the present invention Equivalent substitutions or modifications of the inventive concept are intended to be included within the scope of the invention.

Claims

A novel double seal form dome valve comprising a valve body (100), a valve core (200), a valve seat (300) and a valve cover (400), the valve core (200) being coupled to the shaft member (500) Rotating the shaft member (500) to move the valve core (200) to open or close the dome valve; the gland (600) has one end connected to the valve cover (400) and the other end beyond The inner side surface (401) of the bonnet (400) forms a limiting surface (601) and extends downward to abut the outer end surface (201) of the valve core (200) when the dome valve is closed to form a sealed passage (M). And a gas source passage (800) extending from the opening of the bonnet (400) to the sealing passage (M) to form an intake and exhaust passage, characterized in that:

A sealing assembly (700), including a piston (701) and a sealing gland (702), disposed in the sealing passage (M), the piston (701) being made of a metal material and capable of being in the sealing passage (M) The inner motion, the range of motion is farthest to the limit surface (601), and most recently the outer end surface (201).
The novel double seal form dome valve according to claim 1, wherein said piston (701) and said seal gland (702) are separately disposed, said seal gland (702) The piston (701) is connected by a connector (703).
The novel double seal form dome valve according to claim 1 or 2, wherein the piston (701) is provided with a concave passage, and the seal gland (702) and the concave passage are formed with a gap. a limiting space, and a sealing member (S) is disposed in the limiting space, and a portion of the sealing member (S) protruding from the notch interferes with the outer end surface (201).
A novel double seal form dome valve according to claim 3, further comprising a gas source control unit (900) including a support assembly (901), a reversing valve (902), and a communication assembly (903) And air control components (904);

The support assembly (901) is coupled to the shaft member (500), and the reversing valve (902) is disposed thereon, and one end of the reversing valve (902) is in communication with the air source passage (800). The other end thereof is connected to the air control assembly (904) through the communication assembly (903), and the air control assembly (904) controls the switching of the reversing valve (902).
A novel double seal form dome valve according to claim 4, wherein said pneumatic control assembly (904) further includes a gas source interface (904a) and a control valve (904b),

a passage interface (902a) provided on one end of the reversing valve (902) is connected to a piston interface (R) through a conduit, the piston interface (R) is connected to the air source passage (800), and the other end passes the The communication component (903) is connected to the air source flow interface (904c); the air source interface (904a) is disposed at an upper end of the reversing valve (902), and the control valve (904b) is coupled to the cam (904d) After the conflict, the air source is turned on to the inside of the interface (904c) to complete the opening and closing of the air source flow between the interface (904c) and the reversing valve (902).
A novel double seal form dome valve according to any one of claims 1, 2, 4 or 5, characterized in that the lower end of the valve cover (400) is provided with a limit projection (402), the sealing assembly ( 700) moving between the limiting surface (601) and the limiting protrusion (402) to form a seal.
A novel double seal form dome valve according to claim 6 wherein said spindle member (500) includes an upper shaft (501) and a lower shaft (502), said upper shaft (501) and said The lower shaft (502) is coupled to the spool (200) via a turntable (503).
The novel double seal form dome valve according to claim 7, wherein the valve cover (400) is a boss structure, and the air source passage (800) is opened from the side of the boss structure. A bottom portion extending to the boss structure is in communication with the sealing passage (M).
A novel double seal form dome valve according to claim 7 or 8, wherein a lower end of said piston (701) projects a certain portion with an outer end surface (201) of said valve body (200) Contacting, and the lower end portion of the sealing gland (702) and the outer end surface (201) of the valve core (200) are in contact with each other, and the lower end of the piston (701) is further provided with an open groove near the abutting portion ( 701a).
A novel double seal form dome valve according to claim 9, wherein said piston (701) is made of stellite alloy and has a coefficient of friction of from 0.18 to 0.20.