Isolated two-position three-way valve
阅读说明:本技术 一种隔离式两位三通阀 (Isolated two-position three-way valve ) 是由 朱崇涛 李健 何海涛 刘岳 孙晓伟 马道远 查雄权 姚少君 于 2020-08-25 设计创作,主要内容包括:本发明公开了一种隔离式两位三通阀,包括阀体以及封装于阀体中的阀芯、复位弹簧、活塞和顶杆,阀体内部设置有介质腔和控制腔,阀体的壳体上设置有控制口、排口和3个流体介质接口;阀芯和复位弹簧均封装于介质腔中,活塞封装于控制腔中,顶杆的两端分别连接阀芯和活塞,活塞通过顶杆推动阀芯,使阀门打开或关闭。本发明提供的隔离式两位三通阀,内部结构简单,使用气压(或液压)配合复位弹簧作为阀门动作的驱动力,推动活塞运动。在活塞上设置弹簧蓄能密封圈,实现控制腔的动密封。在介质腔与流体作用腔之间设置隔离腔,实现介质隔离,并且在介质腔与流体作用腔发生泄漏时引走泄漏的流体,能防止介质互串。(The invention discloses an isolated two-position three-way valve which comprises a valve body, a valve core, a reset spring, a piston and a mandril, wherein the valve core, the reset spring, the piston and the mandril are packaged in the valve body; the valve core and the return spring are both packaged in the medium cavity, the piston is packaged in the control cavity, two ends of the ejector rod are respectively connected with the valve core and the piston, and the piston pushes the valve core through the ejector rod to open or close the valve. The isolated two-position three-way valve provided by the invention has a simple internal structure, and uses air pressure (or hydraulic pressure) to be matched with the return spring as the driving force of the valve action to push the piston to move. And a spring energy storage sealing ring is arranged on the piston to realize dynamic sealing of the control cavity. An isolation cavity is arranged between the medium cavity and the fluid action cavity to realize medium isolation, and leaked fluid is guided away when the medium cavity and the fluid action cavity are leaked, so that the media can be prevented from being mutually crossed.)
1. The utility model provides a two three-way valves of isolated, its characterized in that: including the valve body, and encapsulate in case, reset spring, piston and the ejector pin in the valve body, wherein:
a medium cavity and a control cavity are arranged in the valve body, and the medium cavity is communicated with the control cavity through a ejector rod hole; a control port, a discharge port and 3 fluid medium interfaces are arranged on the shell of the valve body; the control port and the discharge port are respectively communicated with the control cavity; the 3 fluid medium interfaces are respectively a fluid inlet, a fluid outlet and a discharge port, and the 3 fluid medium interfaces are respectively communicated with the medium cavity;
the valve core and the return spring are both packaged in the medium cavity; the piston is packaged in the control cavity, a first sealing ring is arranged between the piston and the control cavity, and the control cavity is divided into an isolation cavity communicated with the discharge port and a fluid action cavity communicated with the control port through the piston and the first sealing ring;
the ejector rod is arranged in the ejector rod hole in a penetrating mode, and two ends of the ejector rod are connected with the valve core and the piston respectively; the valve core is driven by the ejector rod and is switched between two states of conducting the fluid inlet and the fluid outlet and conducting the fluid inlet and the drain outlet;
and a second sealing ring is arranged between the ejector rod and the ejector rod hole, and the medium cavity and the control cavity are isolated into two independent cavities through the ejector rod and the second sealing ring.
2. The isolated two-position, three-way valve of claim 1, wherein: the first sealing ring is a spring energy storage sealing ring; the second sealing ring is a spring energy storage sealing ring.
3. The isolated two-position, three-way valve of claim 1, wherein: the valve body comprises a valve seat and end covers positioned at two ends of the valve seat, and the discharge port and the control port are respectively arranged on the two end covers.
4. An isolated two-position three-way valve according to claim 3, wherein: and a third sealing ring is arranged between the valve seat and the end cover provided with the control port.
5. An isolated two-position three-way valve according to any one of claims 1 to 4, wherein: the core body of the valve core is a stepped shaft, and the middle part of the stepped shaft is provided with a positioning step for mounting the return spring; the core body is connected with the ejector rod, and the end faces of the two ends of the core body are respectively used for plugging the fluid outlet and the discharge outlet.
6. An isolated two-position three-way valve according to claim 5, wherein: the valve body is provided with a guide shaft protruding towards the medium cavity, and the discharge port is arranged in the guide shaft; the end part of the guide shaft is provided with a boss, the opening of the discharge port is positioned on the table top of the boss, and the end face of one end of the core body is tightly attached to the table top of the boss so as to seal the discharge port.
7. The isolated two-position, three-way valve of claim 6, wherein: the valve core comprises the core body and a guide sleeve, and the guide sleeve is sleeved on the guide shaft and can axially move along the guide shaft; the reset spring is sleeved on the guide sleeve and is positioned through the positioning step.
8. The isolated two-position, three-way valve of claim 7, wherein: more than 2 medium flow through holes are uniformly formed in the guide sleeve along the circumferential direction, and the discharge port is communicated with the medium cavity through the medium flow holes.
9. An isolated two-position three-way valve according to claim 5, wherein: and a fourth sealing ring is arranged between the core body and the valve body, and the fourth sealing ring is positioned on the end part of the core body connected with the ejector rod.
10. An isolated two-position three-way valve according to claim 9, wherein: and a circle of bulges are arranged on the part of the valve body, which is in contact with the core body, and when the core body is in contact with the valve body and blocks the fluid outlet, the bulges compress the fourth sealing ring.
Technical Field
The application belongs to the technical field of valves, concretely relates to two three-way valves of isolated.
Background
The two-position three-way valve is widely applied to the fields of petrochemical industry and ferrous metallurgy, and has the main structure that three fluid medium interfaces are arranged on a valve body, a valve cavity communicated with the three fluid medium interfaces is arranged inside the valve body, a movable valve core is arranged in the valve cavity, and the on-off of channels between different interfaces on the valve body is controlled by changing the position of the valve core. The valve core moves under the action of injected high-pressure fluid, and if the control fluid is gas, the valve is in a pneumatic control type; if the control fluid is liquid, the valve is in a hydraulic control type.
The problems of valve core damage and medium leakage frequently occur in the use process of the existing two-position three-way valve, and the application of the two-position three-way valve in the high-end industrial field is limited.
Disclosure of Invention
In order to solve the technical problem, the invention provides an isolated two-position three-way valve which has long service life and can prevent a working medium and a control fluid from being mutually connected.
The technical scheme adopted for achieving the purpose of the invention is that the isolated two-position three-way valve comprises a valve body, and a valve core, a return spring, a piston and an ejector rod which are packaged in the valve body, wherein:
a medium cavity and a control cavity are arranged in the valve body, and the medium cavity is communicated with the control cavity through a ejector rod hole; a control port, a discharge port and 3 fluid medium interfaces are arranged on the shell of the valve body; the control port and the discharge port are respectively communicated with the control cavity; the 3 fluid medium interfaces are respectively a fluid inlet, a fluid outlet and a discharge port, and the 3 fluid medium interfaces are respectively communicated with the medium cavity;
the valve core and the return spring are both packaged in the medium cavity; the piston is packaged in the control cavity, a first sealing ring is arranged between the piston and the control cavity, and the control cavity is divided into an isolation cavity communicated with the discharge port and a fluid action cavity communicated with the control port through the piston and the first sealing ring;
the ejector rod is arranged in the ejector rod hole in a penetrating mode, and two ends of the ejector rod are connected with the valve core and the piston respectively; the valve core is driven by the ejector rod and is switched between two states of conducting the fluid inlet and the fluid outlet and conducting the fluid inlet and the drain outlet;
and a second sealing ring is arranged between the ejector rod and the ejector rod hole, and the medium cavity and the control cavity are isolated into two independent cavities through the ejector rod and the second sealing ring.
Optionally, the first sealing ring is a spring energy storage sealing ring; the second sealing ring is a spring energy storage sealing ring.
Optionally, the valve body includes a valve seat and end covers located at two ends of the valve seat, and the discharge port and the control port are respectively disposed on the two end covers.
Optionally, a third sealing ring is arranged between the valve seat and the end cover provided with the control port.
Optionally, the core body of the valve core is a stepped shaft, and the middle part of the stepped shaft is provided with a positioning step for mounting the return spring; the core body is connected with the ejector rod, and the end faces of the two ends of the core body are respectively used for plugging the fluid outlet and the discharge outlet.
Optionally, a guide shaft protruding towards the medium cavity is arranged on the valve body, and the discharge port is arranged in the guide shaft; the end part of the guide shaft is provided with a boss, the opening of the discharge port is positioned on the table top of the boss, and the end face of one end of the core body is tightly attached to the table top of the boss so as to seal the discharge port.
Optionally, the valve core comprises the core body and a guide sleeve, and the guide sleeve is sleeved on the guide shaft and can axially move along the guide shaft; the reset spring is sleeved on the guide sleeve and is positioned through the positioning step.
Optionally, the guide sleeve is uniformly provided with more than 2 medium flow through holes along the circumferential direction, and the discharge port is communicated with the medium cavity through the medium flow through holes.
Optionally, a fourth sealing ring is arranged between the core body and the valve body, and the fourth sealing ring is located at the end part of the core body connected with the ejector rod.
Optionally, a circle of protrusions is arranged on a portion of the valve body, which is in contact with the core, and when the core is in contact with the valve body to block the fluid outlet, the protrusions compress the fourth sealing ring.
According to the technical scheme, the isolated two-position three-way valve comprises a valve body, a valve core, a return spring, a piston and a push rod, wherein the valve core, the return spring, the piston and the push rod are packaged in the valve body, a cavity in the valve body comprises a medium cavity for working fluid medium circulation and a control cavity for controlling fluid action, a push rod hole for installing the push rod is formed between the medium cavity and the control cavity, and after the push rod is installed, the medium cavity and the control cavity are isolated into two independent cavities through the push rod and a second sealing ring, so that isolation between the working medium and the control fluid is realized.
Compared with the existing two-position three-way valve, when the valve core is driven by high-pressure control fluid, the high-pressure control fluid directly acts on the valve core, and the direct impact of the high-pressure control fluid is easy to damage the valve core.
The piston is packaged in the control cavity and sealed through the first sealing ring, so that the control cavity is divided into an isolation cavity and a fluid action cavity, the isolation cavity is arranged between the medium cavity and the fluid action cavity, and on one hand, the isolation cavity plays a role in isolating a medium; on the other hand, when the medium cavity and the fluid action cavity are leaked, the leaked working medium or control fluid can be guided away through the discharge port, and therefore mutual media crossing is prevented.
Compared with the prior art, the isolated two-position three-way valve provided by the invention has the advantages that the piston and the ejector rod are arranged to be in contact with a control fluid medium, so that direct impact of the control fluid on the valve core is avoided, and the valve core is prevented from being damaged by direct impact; the isolation cavity is arranged to isolate the working medium from the control fluid, and the leaked medium can be guided away when the working medium or the control fluid leaks, so that the media are prevented from being mutually crossed. The key parts in the isolated two-position three-way valve are not easy to damage, so that the service life is long, the isolation of internal media is good, and the valve is favorable for application in the high-precision industrial field.
Drawings
FIG. 1 is a full-sectional structural view of an isolated two-position three-way valve in a state of conduction at a drain outlet according to an embodiment of the present invention;
fig. 2 is a full-section structural diagram of the isolated two-position three-way valve in the outlet conduction state in the embodiment of the invention.
Description of reference numerals: 100-an isolated two-position three-way valve; 10-valve body, 11-valve seat, 12a/12 b-end cover, 13-guide shaft, 14-boss and 15-bulge; 20-valve core, 21-core body, 22-guide sleeve, 23-positioning step and 24-medium circulation hole; 30-a return spring; 40-ejector pin; 50-a piston; 60-a media chamber; 70-control chamber, 71-isolation chamber, 72-fluid action chamber; 80-ejector pin holes; 91-first seal ring, 92-second seal ring, 93-third seal ring, 94-fourth seal ring.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
An isolated two-position three-
the
The structure of the
The casing of the
Referring to fig. 1 and 2, the
Referring to fig. 1, in order to prevent the control fluid from leaking, a
The
In the isolated two-position three-
In order to realize effective blocking and prevent medium leakage or pressure release, a
In order to realize effective blocking, and prevent medium leakage or pressure release, a
The
The isolated two-position three-way valve provided by the embodiment of the invention can adopt any one of the following working forms: 1. the working medium is liquid; 2. the working medium is gas; 3. the working medium is gas; 4. the working medium of the hydraulic control valve is liquid.
Taking a first working form of 'pneumatic control valve, working medium is liquid' as an example, the working principle of the isolated two-position three-way valve provided by the embodiment of the invention is as follows:
A. when high-pressure gas in the valve pneumatic control port F leaks out, the
B. When the high-pressure gas in the valve pneumatic control port F is pressurized, the high-pressure gas pushes the
Application example:
in the liquid rocket engine, valves with different functions are needed to control the circulation of propellant, cut off and reverse so as to control the working state of the rocket engine. Compared with a two-position two-way valve (stop valve), the two-position three-way valve is relatively complex in structure and relatively high in failure rate, so that the two-position three-way valve is less applied to a low-temperature engine, and generally one stop valve is installed on each passage. This is one of the factors that limit the application of two-position three-way valves in cryogenic engines.
The second factor limiting the application of the two-position three-way valve in the low-temperature engine is the sealing form of the valve, and the traditional liquid rocket engine valve adopts an O-shaped rubber sealing ring (normal-temperature propellant) and a metal corrugated pipe (low-temperature propellant) as the dynamic sealing form of the traditional liquid rocket engine valve. The O-shaped rubber sealing ring is difficult to be used for low-temperature propellants at present, the pressure application range is narrow, and the O-shaped rubber sealing ring has the advantages of simple structure and is the most common normal-temperature sealing form; the metal corrugated pipe has the advantages that zero leakage can be achieved, but for valves with high medium pressure and large size, the metal corrugated pipe is difficult to manufacture, high in production cost, long in period, large in structural space and less in application to two-position three-way valves.
The isolated two-position three-way valve provided by the embodiment of the invention can be perfectly applied to liquid rocket engines and other low-temperature engines. On one hand, the isolated two-position three-way valve provided by the embodiment of the invention has a simple internal structure, and the valve core is not directly contacted with a control fluid, so that the fault rate is low. On the other hand, in the isolated two-position three-way valve provided by the embodiment of the invention, the two key sealing rings are both spring energy storage sealing rings, and compared with an O-shaped rubber sealing ring, the spring energy storage sealing ring can be used in a higher pressure range and a wider temperature range, especially on a low-temperature liquid rocket engine and on ultra-low-temperature valves such as liquid hydrogen, liquid methane, liquid oxygen and the like; compared with a metal corrugated pipe sealing structure, the high-pressure metal corrugated pipe sealing structure can solve the problems of high development difficulty, long production period and high cost of the high-pressure metal corrugated pipe, occupies a smaller space structure, and can reduce the whole volume and weight of the valve.
In addition, when the isolated two-position three-way valve provided by the embodiment of the invention is applied to liquid rocket engines and other low-temperature engines, one two-position three-way valve plays the role of two stop valves, so that one valve is saved, and members such as pipelines, joints, connections and the like are saved, which is very important for load reduction of aircrafts and aerospace equipment.
Through the embodiment, the invention has the following beneficial effects or advantages:
1) according to the isolated two-position three-way valve provided by the invention, the piston and the ejector rod are arranged to be in contact with a control fluid medium, so that direct impact of the control fluid on the valve core is avoided, and the valve core is prevented from being damaged by direct impact. The key parts in the isolated two-position three-way valve are not easy to damage, so that the service life is long, the isolation of internal media is good, and the valve is favorable for application in the high-precision industrial field.
2) The isolated two-position three-way valve provided by the invention can meet the requirement of a liquid rocket engine on the two-position three-way valve, save the number of valves and optimize a system pipeline; the problems of narrow temperature application range, high-pressure large-size development difficulty, long production period and high cost of the traditional two-position three-way valve are solved.
3) The isolated two-position three-way valve provided by the invention has a simple internal structure, and uses air pressure (or hydraulic pressure) to be matched with the spring as the driving force of the valve action to push the piston to move. And a spring energy storage sealing ring is arranged on the piston to realize dynamic sealing of the control cavity. An isolation cavity is arranged between the medium cavity and the fluid action cavity to realize medium isolation, and leaked fluid is guided away when the medium cavity and the fluid action cavity are leaked, so that the media can be prevented from being mutually crossed.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
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