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CN106763934B - Double-drive quick-closing lifting type non-return and stop combined valve - Google Patents

Double-drive quick-closing lifting type non-return and stop combined valve Download PDF

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Publication number
CN106763934B
CN106763934B CN201611181688.3A CN201611181688A CN106763934B CN 106763934 B CN106763934 B CN 106763934B CN 201611181688 A CN201611181688 A CN 201611181688A CN 106763934 B CN106763934 B CN 106763934B
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China
Prior art keywords
valve
steam inlet
auxiliary
control valve
piston
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CN201611181688.3A
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Chinese (zh)
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CN106763934A (en
Inventor
吕建清
时晓云
吕亦秋
张兴祥
张根泉
韩惠国
陆施嘉
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JIAXING EXPERT MACHINE TECHNIQUE CO LTD
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JIAXING EXPERT MACHINE TECHNIQUE CO LTD
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Publication of CN106763934A publication Critical patent/CN106763934A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)
  • Lift Valve (AREA)

Abstract

The utility model provides a double-drive quick-closing lifting check and stop combined valve, which comprises a valve body, a valve rod and a valve disc, wherein a steam inlet cavity, a valve disc seat and a steam outlet cavity are arranged in the valve body; the method is characterized in that: the device also comprises a steam inlet pipe, an auxiliary piston, a main driving device and an auxiliary control valve, wherein the main driving device is connected with the valve rod; the auxiliary piston is fixed on the valve rod or connected with the main driving device, the auxiliary piston is positioned in the valve body and forms an auxiliary chamber with the valve body, the auxiliary chamber is provided with a steam outlet, and the auxiliary chamber is communicated with the steam inlet cavity through the steam inlet pipe; the auxiliary control valve comprises an auxiliary driving device and a control valve, wherein the auxiliary driving device controls the control valve to act and enables the control valve to be switched between a position for conducting the steam inlet pipe and a position for conducting the steam outlet. The utility model has simple structure, reasonable design, high closing speed and good sealing performance.

Description

Double-drive quick-closing lifting type non-return and stop combined valve
Technical Field
The utility model relates to a double-drive quick-closing lifting check and stop combined valve, and belongs to the field of valve and pipeline engineering design.
Background
The check valve (also called as check valve) is a valve for preventing the medium from flowing backward by automatically opening and closing a valve disc by the flow of the medium itself. The check valve is an automatic valve, and has the main functions of preventing medium from flowing backwards, preventing reverse accident of turbine, pump and driving motor, and preventing medium leakage of pipeline and container. The check valve may also be used on a line to provide makeup to auxiliary systems where the pressure may rise above the system pressure.
Shut-off valves, which are forced-closure and sealing valves, require that pressure be applied to the valve disc to force the sealing surface against leakage when the valve is closed. The opening and closing piece of the stop valve is a valve disc, the sealing surface of the valve disc is a plane or a conical surface, and the valve disc moves linearly along the center line of the valve seat. The valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like. Thus, a shut-off valve of this type is very suitable for shut-off or regulation and throttling. The valve rod of the valve has relatively short opening or closing stroke, has very reliable cutting function, and is very suitable for regulating flow rate due to the proportional relation between the change of the valve seat through hole and the stroke of the valve disc.
In order to achieve the two technical and safety function targets of on-off control and medium backflow prevention on pipelines such as steam supply and water supply, the existing check valve and stop valve technologies have respective technical defects, and a check valve (lifting or swing type) and a (lifting type) stop valve are generally arranged in series to respectively meet two different functional requirements, so far, various textbooks, design manuals and pipeline design conveniences recommended by professional standards are adopted. This way of arranging a non-return valve and a shut-off valve in series has the following drawbacks: 1. the two valves are arranged, so that the installation and maintenance are very inconvenient, when the device is used, the two valves are required to be controlled respectively, the operation and the control are inconvenient, and the overall cost of the device is increased; 2. two sets of valves are arranged, and the pressure loss of the air flow is delta P Valve group ＝ΔP Check valve +ΔP Stop valve When the device runs for a long time, the lost energy consumption is considerable, and a large amount of energy is wasted; 3. because the power parameter and the volume parameter of the driving device of the existing valve are in a direct proportion relation, but the proportion relation between the volume of the driving device and the volume of the valve cannot be increased without limit, the closing speed serving as an important performance index of the valve and the sealing performance after closing show an opposite corresponding relation with the flow and the pressure of the valve fluid working medium.Within the usual accepted limits, it is necessary to provide an actuation device which is several times larger than the valve volume, as long as the pressure of the valve fluid working medium is slightly higher. Under the condition of two parameters of high flow rate and high pressure of valve fluid working medium, the technical method for simply increasing the volume of the driving device is not feasible, reliable and economical.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide the lifting type non-return and stop combined valve which is reasonable in structural design, high in closing speed, good in sealing performance and low in cost and is driven by two pairs of gears to be closed quickly.
The utility model solves the problems by adopting the following technical scheme: the double-drive quick-closing lifting check and stop combined valve comprises a valve body, a valve rod and a valve disc, wherein a steam inlet cavity, a valve disc seat and a steam outlet cavity are arranged in the valve body; the method is characterized in that: also comprises a steam inlet pipe, an auxiliary piston, a main driving device and an auxiliary control valve,
the main driving device is connected with the valve rod and controls the valve rod to actuate;
the auxiliary piston is fixed on the valve rod or connected with the main driving device, the auxiliary piston is positioned in the valve body and forms an auxiliary chamber with the valve body, the auxiliary chamber is provided with a steam outlet, and the auxiliary chamber is communicated with the steam inlet cavity through the steam inlet pipe;
the auxiliary control valve comprises an auxiliary driving device and a control valve, the auxiliary driving device controls the control valve to act and enables the control valve to be switched between a position for conducting the steam inlet pipe and a position for conducting the steam outlet, when the steam inlet pipe is conducted, the steam outlet is closed by the control valve, the auxiliary chamber is communicated with the steam inlet cavity through the steam inlet pipe, the pressure of the auxiliary chamber and the pressure of the steam inlet cavity are balanced, when the steam outlet is conducted, the steam inlet pipe is cut off by the control valve, and the steam outlet is conducted.
The control valve is provided with a sealing surface and a steam inlet passage, when the steam outlet is conducted, the steam inlet passage is cut off from the steam inlet pipe, and when the steam inlet pipe is conducted, the steam outlet is pressed by the sealing surface of the control valve, and the steam inlet pipe is communicated with the steam inlet passage.
The steam inlet pipe comprises a first pipeline and a second pipeline, wherein one end of the first pipeline is communicated with the auxiliary chamber, the other end of the first pipeline corresponds to the control valve, one end of the second pipeline is communicated with the steam inlet chamber, the other end of the second pipeline corresponds to the control valve, when the control valve is at a position for conducting the steam outlet, the control valve is used for blocking one ends corresponding to the first pipeline and the second pipeline respectively, and at the position for conducting the steam inlet pipe, the first pipeline, the steam inlet passage and the second pipeline are conducted.
The main driving device is a driving cylinder and comprises a first cylinder body, a first piston rod, a first main piston and a first spring, wherein the first main piston is arranged in the first cylinder body and is connected with the first piston rod, the first spring is arranged in the first cylinder body, two ends of the first spring respectively prop against the first main piston and the first cylinder body and enable the first spring to keep pretightening force on the first piston rod, and a first oil cavity is formed in the first cylinder body at the other side of the first main piston relative to the first spring.
The auxiliary driving device is a driving cylinder and comprises a second cylinder body, a second piston rod, a second main piston and a second spring, wherein the second main piston is arranged in the second cylinder body, the second piston rod is connected with the second main piston, the control valve is fixed on the second piston rod and can move under the driving of the second piston rod, so that the control valve is switched between a position for conducting the steam inlet pipe and a position for conducting the steam outlet, and two ends of the second spring respectively prop against the second main piston and the second cylinder body and keep pretightening force on the second piston rod by the second spring.
The utility model also includes a locking structure disposed on the valve stem and cooperating with the valve flap.
The valve rod is provided with a limiting surface, the locking structure is a nut and is connected to the valve rod in a threaded manner, and the valve disc is arranged between the limiting surface and the locking structure.
Compared with the prior art, the utility model has the following advantages and effects: the valve has the advantages of simple structure, reasonable design, higher valve closing speed and better valve sealing performance when the reverse airflow and the forward airflow are closed.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic sectional view of a double-drive quick-closing lift check and shutoff combined valve in embodiment 1.
Fig. 2 is a schematic sectional structure of a double-drive quick-closing lift check and shutoff combined valve in embodiment 2.
Detailed Description
The present utility model will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present utility model and not limited to the following examples.
Example 1.
Referring to fig. 1, the double-drive quick-closing lift check and stop combined valve of the present embodiment includes a valve body 1, a valve stem 4, a valve disc 2, an intake pipe 5, an auxiliary piston 34, a main driving device 3, and an auxiliary control valve.
In this embodiment, the valve body 1 is provided with a steam inlet chamber 11, a valve disc seat 12 and a steam outlet chamber 13, the valve disc 2 is arranged on the valve rod 4 and is located in the valve body 1, the valve disc 2 has an open position and a closed position, and can be switched between the open position and the closed position, so as to control the opening and closing of the valve body 1, when in the closed position, the valve disc 2 covers the valve disc seat 12 and intercepts the valve disc seat 12, and when in the open position, the valve disc 2 is lifted relative to the valve disc seat 12 and enables fluid to pass through the valve disc seat 12. The valve disc seat 12 is provided with a flow passage, and the valve disc 2 closes the valve body by cutting off the flow passage.
The main driving device 3 in this embodiment is connected to the valve stem 4 and controls the actuation of the valve stem 4. The main driving device 3 in this embodiment may be a cylinder structure, an oil cylinder structure, a motor feeding structure, or the like, and may be configured to perform the operation of the valve rod 4.
The auxiliary piston 34 in this embodiment is fixed on the valve rod 4 or connected with the main driving device 3, the auxiliary piston 34 is located in the valve body 1 and forms an auxiliary chamber 14 with the valve body 1, the auxiliary chamber 14 is provided with a steam outlet 141, the auxiliary chamber 14 is communicated with the steam inlet cavity 11 through the steam inlet pipe 5, and when the auxiliary chamber 14 is communicated with the steam inlet cavity 11, the pressure of the auxiliary chamber 14 and the pressure of the steam inlet cavity 11 reach balance.
The auxiliary control valve in this embodiment includes an auxiliary driving device 8 and a control valve 7, the auxiliary driving device 8 controls the control valve 7 to operate and makes the control valve 7 switch between a position where the steam inlet pipe 5 is conducted and a position where the steam outlet 141 is conducted, when the steam inlet pipe 5 is conducted, the steam outlet 141 is closed by the control valve 7, the auxiliary chamber 14 communicates with the steam inlet chamber 11 through the steam inlet pipe 5, the auxiliary chamber 14 balances the pressure of the steam inlet chamber 11, when the steam outlet 141 is conducted, the steam inlet pipe 5 is cut off by the control valve 7, and the steam outlet 141 is conducted. When the exhaust port 141 is open, the auxiliary chamber 14 is connected to the atmospheric pressure or the water drain pipe, and the pressure of the auxiliary chamber 14 is equal to the atmospheric pressure or the pressure in the water drain pipe.
The control valve 7 in this embodiment has a sealing surface 71 and a steam inlet passage 72, and in the position of the conducting steam outlet 141, the steam inlet passage 72 is shut off from the steam inlet pipe 5, and in the position of the conducting steam inlet pipe 5, the steam outlet 141 is pressed by the sealing surface 71 of the control valve 7, and the steam inlet pipe 5 communicates with the steam inlet passage 72.
The specific structure of the steam inlet pipe 5 in this embodiment includes a first pipeline 51 and a second pipeline 52, where one end of the first pipeline 51 is communicated with the auxiliary chamber 14, the other end of the first pipeline corresponds to the control valve 7, one end of the second pipeline 52 is communicated with the steam inlet chamber 11, the other end of the second pipeline corresponds to the control valve 7, when the control valve 7 is at the position of conducting the steam outlet 141, the control valve 7 blocks one ends corresponding to the first pipeline 51 and the second pipeline 52, and when the steam inlet pipe 5 is conducted, the first pipeline 51, the steam inlet passage 72 and the second pipeline 52 are conducted, i.e. the positions of the first pipeline 51, the steam inlet passage 72 and the second pipeline 52 correspond, and when the steam inlet passage 72 is misplaced with the first pipeline 51 and the second pipeline 52, the steam inlet pipe 5 is blocked.
Preferably, the main driving device 3 in this embodiment is a driving cylinder, and includes a first cylinder 31, a first piston rod 32, a first main piston 33, and a first spring 35, where the first main piston 33 is disposed in the first cylinder 31 and connected to the first piston rod 32, the first spring 35 is disposed in the first cylinder 31, two ends of the first spring 35 respectively abut against the first main piston 33 and the first cylinder 31 and keep the first spring 35 pre-tightening the first piston rod 32, and a first oil cavity 36 is formed on the other side of the first main piston 33 opposite to the first spring 35 in the first cylinder 31, and control over the first main piston 33 is achieved by injecting or draining oil into or from the first oil cavity 36. First oil chamber 36 is introduced with a fluid medium, the pressure of first oil chamber 36 is increased, the fluid force applied to first main piston 33 is larger than the force of first spring 35, first main piston 33 moves upward, and first piston rod 32 and valve rod 4 are driven to move upward synchronously. When first oil chamber 36 is empty, first oil chamber 36 pressure drops, first main piston 33 is subjected to a fluid force less than the force of the first spring, first main piston 33 has a downward movement condition, and first piston rod 32, valve stem 4 and valve disc 2 are driven synchronously downward, and valve disc 2 obtains a closing driving force from main driving device 3.
Preferably, the auxiliary driving device 8 in this embodiment is a driving cylinder, and includes a second cylinder 81, a second piston rod 82, a second main piston 83 and a second spring 84, where the second main piston 83 is disposed in the second cylinder 81, the second piston rod 82 is connected to the second main piston 83, and the control valve 7 is fixed on the second piston rod 82 and can be driven by the second piston rod 82 to move, so that the control valve 7 is switched between a position where the steam inlet pipe 5 is conducted and a position where the steam outlet 141 is conducted, and two ends of the second spring 84 respectively abut against the second main piston 83 and the second cylinder 81, and the second spring 84 maintains a pre-tightening force on the second piston rod 82. The control principle of the auxiliary drive 8 is substantially the same as that of the main drive 3 and will not be described here again.
The positional relationship in the present embodiment is merely a positional relationship in the drawings, and does not represent a position at the time of actual use.
The advantages of this embodiment are:
in this embodiment an auxiliary piston 34 is provided, but the position of this piston is different from existing valves and also from the common manner seen in valve design manuals, domestic major professional valve manufacturer samples. In this embodiment, the auxiliary piston 34 is arranged at one side of the steam inlet chamber 11 of the valve, and below the valve disc 2. The auxiliary piston 34 forms a pneumatic drive under the pressure of the inlet chamber 11 and the pressure of the auxiliary chamber 14, the auxiliary piston 34 together with the main drive 3 powering the quick closing of the valve disc 2. And the higher the pressure of the inlet chamber 11 is, the larger the power is obtained, and other valves are limited due to the pressure of control/power fluid medium, and the diameter size of the power cylinder cannot be amplified limitlessly, so that under the condition of high flow and high pressure, various problems are caused by insufficient power of an actuating mechanism. In short, under the working condition that the high pressure and the large flow rate occur in the fluid medium conveyed by the valve, the dual-drive quick-closing lifting check and stop combined valve in the embodiment shows the valve performance which is improved simultaneously along with the increase of the pressure of the fluid medium, and other valves serving as comparison objects show the valve performance which tends to be reduced along with the increase of the pressure of the fluid medium.
The dual-drive quick-closing lifting check and stop combined valve in the embodiment is provided with a steam outlet 141 and a connecting pipeline 5, when the steam outlet 141 of the auxiliary chamber 14 is opened, the pressure of the auxiliary chamber 14 is reduced to the ambient atmospheric pressure or the time of the pressure of the low-pressure drain pipe is less than or equal to 0.1S, and when the air is exhausted, the auxiliary piston 34 can be quickly downwards under the action of the pressure of the fluid in the steam inlet cavity 11.
This embodiment has the advantage of reduced vapor pressure loss compared to the conventional form of a check valve and a shut-off valve in series. Conventionally, the vapor pressure loss: ΔP Valve group ＝ΔP Check valve +ΔP Stop valve 。
Pressure drop coefficient of lifting check valve= (lifting) pressure drop coefficient of stop valve, therefore, the pressure loss of the novel valve based on lifting check valve is as follows: Δpdnew valve=Δpdutvalve. From this follows: the Δp new valve- Δp valve group=Δp check valve, i.e. the lifting double-drive quick-closing lifting check and stop combined valve of the embodiment can reduce the pressure loss of one check valve if replacing the traditional two-valve serial arrangement mode, and has considerable economic and energy-saving environmental benefits of energy conservation and consumption reduction brought by long-term operation.
In addition, the two valves are changed into one valve, so that the installation, maintenance and operation control are more convenient, and the equipment cost is reduced.
Technical advantages of the double-drive quick-closing lifting check and stop combination valve in the present embodiment
During the 0.9S time after the auxiliary chamber 14 pressure drops to ambient atmospheric or low pressure hydrophobic tube media pressure:
valve disc 2 closing power = main drive 3 power + pressure of the outlet chamber 13 x valve disc 2 area + (auxiliary piston 34 area-valve disc 2 area) × (inlet chamber pressure-atmospheric pressure or drain tube medium pressure).
Whereas the combined lift check and shut-off valve with auxiliary piston 34 of the present embodiment is the subject of comparison of a shut-off valve or check valve with dual drive quick shut-off, their maximum effect of auxiliary piston only balances the resistance force of the pressure against the valve disc, the closing speed of the valve disc and the sealing of the valve disc only depend on the spring force of the valve power cylinder.
Another key problem is that the closing function and the sealing performance after closing of other stop valves or check valves, which are the comparison objects of the lifting type check and stop combined valves with the dual driving and quick closing in the present embodiment, can only be adapted to the situation that pressure exists in a single direction, specifically, the stop valve has pressure on the steam outlet side of the valve, and the valve disc is likely to be re-opened when the pressure exists on the steam inlet side of the valve; the check valve has pressure on the steam inlet side of the valve, and the valve disc can be opened again under the condition that the pressure on the steam outlet side is not available, so that the check valve can meet the full-working-condition operation requirement that the pressure can exist in both directions only by combining a stop valve with the check valve; in the lifting type non-return and stop combined valve with double driving and quick closing in the embodiment, after the valve is closed, the pressure existing in the steam inlet cavity 11 or the steam outlet cavity 13 can not only reopen the valve disc 2, but also provide acting force consistent with the force direction of the main driving device spring 35, so that the valve disc 2 is ensured to obtain enough sealing specific pressure, and the sealing performance of the valve disc 2 is effectively ensured.
In summary, the dual-drive quick-closing lifting check and stop combined valve in the embodiment has two advantages, namely a direct advantage of a single-valve full-working-condition closing speed advantage and a single-valve full-working-condition sealing performance advantage.
Operation and control of double-drive quick-closing lifting check and stop combination valve in embodiment
(1) Opening of valves
In operation, the steam outlet 141 of the auxiliary chamber 14 is closed, the connecting pipeline 5 is conducted, the auxiliary chamber 14 establishes pressure, namely, the auxiliary chamber 14 and the steam inlet cavity 11 are balanced in pressure, the auxiliary piston 34 is balanced in pressure up and down, the first piston rod 32 of the main driving device 3 is lifted, the valve disc 2 is lifted along the valve rod 4 against self gravity under the action of the air inlet pressure of the steam inlet cavity 11 and the driving action of the valve rod 4, and the valve is opened.
(2) Closing of valves
The steam outlet 141 of the auxiliary chamber 14 is opened, the connecting pipeline 5 is cut off, the pressure of the auxiliary chamber 14 is reduced to the ambient atmospheric pressure or the pressure of low-pressure drain pipe steam, the time is less than 0.1 second, the valve rod 4 rapidly drives the valve disc 2 to complete closing action under the combined action of the force of the main driving device spring 35 and the pressure of the auxiliary piston 34, and the valve closing time is less than or equal to 1S.
If the pressure of the valve steam outlet cavity 13 is larger than the pressure of the steam inlet cavity 11 under the normal or emergency shutdown condition, namely, the initial stage of the steam flow backward flow phenomenon occurs, the valve disc 2 can also generate a quick closing action independent of the valve rod 4 under the action of reverse steam flow and the self gravity of the valve disc 2, and the valve disc is expressed as a common lifting check valve function.
(3) Sealing after downstream closing
The valve is closed in the case of medium pressure in the downstream direction, if the medium pressure continues to exist, the pressure is equal to the atmospheric pressure or the drain pipe pressure because the auxiliary chamber 14 below the auxiliary piston 34 is emptied, and at this time, the surplus part of the upper part of the auxiliary piston 34, which is counteracted by the medium pressure acting on the valve disc 2, is added with the pretightening force of the main driving device spring 35, so that the valve reaches the sealing standard.
(4) Sealing after reverse steam flow is closed
In this embodiment, when the medium pressure exists in the reverse airflow direction, the valve disc 2 is closed, and the sealing condition of the valve disc 2 is better because the medium acting force applied to the valve disc 2 is the same as the pretightening force direction of the main driving device spring 35, so that the sealing standard can be achieved, and the leakage problem does not exist because the medium pressure does not exist in the steam inlet cavity 11 above the auxiliary piston 34.
(5) Sealing under normal steam supply working condition
In the normal operating state of the valve disc 2 open and supplying steam along the air flow, the steam outlet 141 of the auxiliary chamber 14 is blocked, and no additional leakage problem exists.
In this embodiment, the direction of the air flow refers to the direction from the air inlet chamber 11 to the flow channel 12 and then to the air outlet chamber 13, and the direction of the air flow refers to the direction from the air outlet chamber 13 to the flow channel 12 and then to the air inlet chamber 11.
The control of the oil cylinder in this embodiment is related art, and will not be described here again.
The lifting type non-return and stop combined valve capable of being quickly closed by lifting double driving in the embodiment is applicable to various pipe networks, such as pressure pipelines, tap water pipe networks and the like, the application range of the lifting type non-return and stop combined valve is basically consistent with the application range of the non-return valve, namely, the lifting type non-return and stop combined valve capable of being quickly closed by lifting double driving in the embodiment can be used for replacing the non-return valve, and the application range is quite wide. The device is particularly suitable for pipelines with larger pressure in a steam turbine.
The term "double drive" in the present utility model refers to the force provided by the main drive 3 and the auxiliary drive together.
Example 2.
Referring to fig. 2, the basic structure of the dual-drive quick-closing lift check and stop combination valve in this embodiment is the same as that of embodiment 1, except that this embodiment further includes a locking structure 9, and the locking structure 9 is disposed on the valve stem 4 and cooperates with the valve flap 2.
The valve rod 4 in this embodiment is provided with a limiting surface 41, the locking structure 9 is a nut and is in threaded connection with the valve rod 4, the valve clack 2 is arranged between the limiting surface 41 and the locking structure 9, and the valve clack 2 can be locked with the locking structure through the limiting surface 41, so that the combination valve can be used as a stop valve. The stop surface 41 can also be replaced by a nut.
The foregoing description of the utility model is merely exemplary of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions, without departing from the scope of the utility model as defined in the accompanying claims.

Claims (5)

1. A dual-drive quick-closing lifting backstop and stop combined valve comprises a valve body, a valve rod and a valve disc, wherein a steam inlet cavity, a valve disc seat and a steam outlet cavity are arranged in the valve body; the method is characterized in that: also comprises a steam inlet pipe, an auxiliary piston, a main driving device and an auxiliary control valve,
the main driving device is connected with the valve rod and controls the valve rod to actuate;
the auxiliary piston is fixed on the valve rod or connected with the main driving device, the auxiliary piston is positioned in the valve body and forms an auxiliary chamber with the valve body, the auxiliary chamber is provided with a steam outlet, and the auxiliary chamber is communicated with the steam inlet cavity through the steam inlet pipe;
the auxiliary control valve comprises an auxiliary driving device and a control valve, the auxiliary driving device controls the control valve to act and enables the control valve to switch between a position for conducting the steam inlet pipe and a position for conducting the steam outlet, when the steam inlet pipe is conducted, the steam outlet is closed by the control valve, the auxiliary chamber is communicated with the steam inlet cavity through the steam inlet pipe, the pressure of the auxiliary chamber and the pressure of the steam inlet cavity are balanced, when the steam outlet is conducted, the steam inlet pipe is cut off by the control valve, and when the steam outlet is conducted, the steam outlet is conducted;
the control valve is provided with a sealing surface and a steam inlet passage, when the steam outlet is conducted, the steam inlet passage is cut off from the steam inlet pipe, and when the steam inlet pipe is conducted, the steam outlet is pressed by the sealing surface of the control valve, and the steam inlet pipe is communicated with the steam inlet passage;
the steam inlet pipe comprises a first pipeline and a second pipeline, wherein one end of the first pipeline is communicated with the auxiliary cavity, the other end of the first pipeline corresponds to the control valve, one end of the second pipeline is communicated with the steam inlet cavity, the other end of the second pipeline corresponds to the control valve, when the control valve is at the position of conducting the steam outlet, the control valve blocks one ends corresponding to the first pipeline and the second pipeline respectively, and at the position of conducting the steam inlet pipe, the first pipeline, the steam inlet passage and the second pipeline are conducted.
2. The dual-drive quick-closing, lifting check and shutoff combination valve of claim 1, wherein: the main driving device is a driving cylinder and comprises a first cylinder body, a first piston rod, a first main piston and a first spring, wherein the first main piston is arranged in the first cylinder body and connected with the first piston rod, the first spring is arranged in the first cylinder body, two ends of the first spring respectively prop against the first main piston and the first cylinder body and enable the first spring to keep pretightening force on the first piston rod, and a first oil cavity is formed in the first cylinder body at the other side of the first main piston relative to the first spring.
3. The dual-drive quick-closing, lifting check and shutoff combination valve of claim 1, wherein: the auxiliary driving device is a driving cylinder and comprises a second cylinder body, a second piston rod, a second main piston and a second spring, wherein the second main piston is arranged in the second cylinder body, the second piston rod is connected with the second main piston, and the control valve is fixed on the second piston rod and can move under the driving of the second piston rod, so that the control valve is switched between a position for conducting the steam inlet pipe and a position for conducting the steam outlet, and two ends of the second spring are respectively propped against the second main piston and the second cylinder body, and the second spring keeps pretightening force on the second piston rod.
4. The dual-drive quick-closing, lifting check and shutoff combination valve of claim 1, wherein: the valve further comprises a locking structure which is arranged on the valve rod and matched with the valve clack.
5. The dual-drive quick-closing, lifting check and shutoff combination valve of claim 4, wherein: the valve rod is provided with a limiting surface, the locking structure is a nut and is in threaded connection with the valve rod, and the valve disc is arranged between the limiting surface and the locking structure.
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CN107061764B (en) * 2017-06-13 2019-05-21 北京艾迪西暖通科技有限公司 Moment shut-off valve
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