阅读说明：本技术 一种气体差压自动切换阀 (Gas differential pressure automatic switching valve ) 是由 王骁诚 李贤勇 林庆旋 陈悟方 王鹤 于 2020-06-16 设计创作，主要内容包括：本发明涉及一种气体差压自动切换阀,包括阀体,所述阀体包括第一端盖、第二端盖、中间阀体以及输出阀体,所述第一端盖与第二端盖位于所述中间阀体的两侧,所述中间阀体的一端开设置有输出口,所述输出阀体与输出口连接,且与中间阀体相通,所述第一端盖和第二端盖与所述中间阀体相通,所述中间阀体的中心设置有阀芯组合体,所述阀芯组合体于中间阀体内轴向运动。本发明的气动差压自动切换阀相对于电磁阀切换阀更加安全的正常工作,在切换过程中不产生任何电火花,安全性更高。且在压差状态下能正常运作切换。本发明的气动差压自动切换阀相对于膜式切换阀,在纯氧气中不易氧气、寿命长、耐压高,克服了膜式切换阀的缺点。(The invention relates to an automatic gas differential pressure switching valve which comprises a valve body, wherein the valve body comprises a first end cover, a second end cover, a middle valve body and an output valve body, the first end cover and the second end cover are positioned on two sides of the middle valve body, an output port is formed in one end of the middle valve body, the output valve body is connected with the output port and communicated with the middle valve body, the first end cover and the second end cover are communicated with the middle valve body, a valve core assembly is arranged in the center of the middle valve body, and the valve core assembly axially moves in the middle valve body. Compared with an electromagnetic valve switching valve, the pneumatic differential pressure automatic switching valve disclosed by the invention can work more safely and normally, does not generate any electric spark in the switching process, and is higher in safety. And can be switched normally under the condition of pressure difference. Compared with a membrane type switching valve, the pneumatic differential pressure automatic switching valve is difficult to be oxidized in pure oxygen, has long service life and high pressure resistance, and overcomes the defects of the membrane type switching valve.)

1. The utility model provides a gas differential pressure automatic switch valve, includes the valve body, its characterized in that: the valve body includes first end cover, second end cover, middle valve body and output valve body, first end cover and second end cover are located the both sides of middle valve body, the delivery outlet has been seted up to the one end of middle valve body, the output valve body is connected with the delivery outlet, and communicates with each other with middle valve body, first end cover and second end cover with middle valve body communicates with each other, the center of middle valve body is provided with the case assembly, the case assembly is axial motion in middle valve body, the case assembly with first end cover forms first cavity, the case assembly with the second end cover forms the second cavity, set up first air inlet and second air inlet in first end cover and the second end cover, first air inlet communicates with each other with first cavity, the second air inlet communicates with each other with the second cavity.

2. The automatic differential gas pressure switching valve according to claim 1, characterized in that: the valve core assembly comprises a left valve core, a left valve core seal, damping steel balls, a damping spring, a right valve core and a right valve core seal, wherein a containing cavity is formed in the middle of a damping seat, the damping steel balls and the damping spring are arranged in the containing cavity, the damping steel balls are located at two ends of the damping spring, the left valve core and the right valve core are fixedly connected with the damping seat, the left valve core and the right valve core are respectively located in a first cavity and a second cavity, central damping rings are arranged at two ends of the valve core assembly, vent holes are formed in the parts, located in the first cavity and the second cavity, of the central damping rings, damping grooves are formed in the central damping rings, and the damping grooves are matched with the damping steel balls for use.

3. The automatic differential gas pressure switching valve according to claim 2, characterized in that: the middle valve body is further provided with a valve seat, one side of the valve seat, which is far away from the output valve body, is formed, and the first end cover and the second end cover are fixedly connected with the valve seat through end cover screws respectively.

4. The automatic differential gas pressure switching valve according to claim 3, characterized in that: a magnetic rod is arranged between the left valve core and the damping seat, a magnetic rod is also arranged between the right valve core and the damping seat, magnetic induction switches are further arranged on the first end cover and the second end cover, and the magnetic induction switches are fixed above the first end cover and the second end cover through fixing screws.

Technical Field

The invention relates to the field of medical equipment, in particular to an automatic gas differential pressure switching valve.

Background

The existing gas switching is mostly electromagnetic valve switching and membrane switching valve. The purpose of switching gas left and right is achieved through the control of the electromagnetic valve, the electromagnetic valve generates heat when being electrified for a long time, electric sparks and coil burnout are likely to be generated, and the electromagnetic valve is not safe in the conveying process of the gas such as oxygen. And the solenoid valve switches and needs to pass through the power, if the outage will lead to unable switching, produces certain influence to hospital's oxygen suppliment safety. The film of the film type switching valve is mostly a rubber cloth curtain film, is easy to oxidize in pure oxygen, has short service life, low pressure resistance and easy cracking and damage, and can generate certain influence on normal oxygen supply of hospitals.

Disclosure of Invention

In view of the above, the present invention provides an automatic differential gas pressure switching valve.

In order to achieve the above purpose, the invention is realized by the following technical scheme:

the invention relates to an automatic switching valve for gas differential pressure, which comprises a valve body, wherein the valve body comprises a first end cover, a second end cover, a middle valve body and an output valve body, the first end cover and the second end cover are positioned at two sides of the middle valve body, one end of the middle valve body is provided with an output port, the output valve body is connected with the output port, and is communicated with the middle valve body, the first end cover and the second end cover are communicated with the middle valve body, the center of the middle valve body is provided with a valve core assembly, the valve core assembly moves axially in the middle valve body, the valve core assembly and the first end cover form a first cavity, the valve core combination and the second end cover form a second chamber, a first air inlet and a second air inlet are arranged in the first end cover and the second end cover, the first inlet port is in communication with the first chamber and the second inlet port is in communication with the second chamber.

The valve core assembly comprises a left valve core, a left valve core seal, damping steel balls, a damping spring, a right valve core and a right valve core seal, wherein a containing cavity is formed in the middle of a damping seat, the damping steel balls and the damping spring are arranged in the containing cavity, the damping steel balls are located at two ends of the damping spring, the left valve core and the right valve core are fixedly connected with the damping seat, the left valve core and the right valve core are respectively located in a first cavity and a second cavity, central damping rings are arranged at two ends of the valve core assembly, vent holes are formed in the parts, located in the first cavity and the second cavity, of the central damping rings, damping grooves are formed in the central damping rings, and the damping grooves are matched with the damping steel balls for use.

The middle valve body is further provided with a valve seat, one side of the valve seat, which is far away from the output valve body, is formed, and the first end cover and the second end cover are fixedly connected with the valve seat through end cover screws respectively.

A magnetic rod is arranged between the left valve core and the damping seat, a magnetic rod is also arranged between the right valve core and the damping seat, magnetic induction switches are further arranged on the first end cover and the second end cover, and the magnetic induction switches are fixed above the first end cover and the second end cover through fixing screws.

The invention has the beneficial effects that: compared with an electromagnetic valve switching valve, the pneumatic differential pressure automatic switching valve disclosed by the invention can work more safely and normally, does not generate any electric spark in the switching process, and is higher in safety. And can be switched normally under the condition of pressure difference. Compared with a membrane type switching valve, the pneumatic differential pressure automatic switching valve is difficult to be oxidized in pure oxygen, has long service life and high pressure resistance, and overcomes the defects of the membrane type switching valve.

Drawings

Fig. 1 is a schematic view of the left side vent structure of the present invention.

Fig. 2 is a schematic diagram of the right side vent structure of the present invention.

Fig. 3 is a schematic diagram of the application of the present invention in a gas switching system.

Reference numerals: 1. a first end cap; 2. an end cap screw; 3. a valve seat; 4. an output port; 5. a central damping ring; 6. a second end cap; 7. sealing the right valve core; 8. a right valve core; 9. a damping seat; 10. damping steel balls; 11. a damping spring; 12. a left valve core; 13. sealing the left valve core; 14. a magnetic induction switch; 15. fixing screws; 16. a magnetic bar; 17. a damping slot; 18. a vent; 19. an intermediate valve body; 20. an output valve body; 21. a first air inlet; 22. a second air inlet; 100. a first chamber; 200. a second chamber.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-2, the present invention is an automatic switching valve with gas differential pressure, comprising a valve body, wherein the valve body comprises a first end cover 1, a second end cover 6, a middle valve body 19 and an output valve body 20, the first end cover 1 and the second end cover 6 are located at two sides of the middle valve body 19, one end of the middle valve body 19 is provided with an output port 4, the output valve body 20 is connected with the output port 4 and communicated with the middle valve body 19, the first end cover 1 and the second end cover 6 are communicated with the middle valve body 19, the center of the middle valve body 19 is provided with a valve core assembly, the valve core assembly axially moves in the middle valve body 19, the valve core assembly and the first end cover 1 form a first chamber 100, the valve core assembly and the second end cover 6 form a second chamber 200, the first end cover 1 and the second end cover 6 are provided with a first gas inlet 21 and a second gas inlet 22, the first air inlet 21 is communicated with the first cavity 100, the second air inlet 22 is communicated with the second cavity 200, the first air inlet 21 is connected with an air supply device, the right air inlet is connected with a right air supply device, and the output valve body 20 is connected with an output pipeline air outlet valve.

The valve core assembly comprises a left valve core 12, a left valve core seal, damping steel balls 10, a damping spring 11, a right valve core 8 and a right valve core seal 7, wherein an accommodating cavity is formed in the middle of a damping seat 9, the damping steel balls 10 and the damping spring 11 are arranged in the accommodating cavity, the damping steel balls 10 are located at two ends of the damping spring 11, the left valve core 12 and the right valve core 8 are fixedly connected with the damping seat 9, the left valve core 12 and the right valve core 8 are respectively located in a first cavity 100 and a second cavity 200, central damping rings 5 are arranged at two ends of the valve core assembly, vent holes 18 are formed in parts, located in the first cavity 100 and the second cavity 200, of the central damping rings 5, damping grooves 17 are formed in the central damping rings 5, and the damping grooves 17 are matched with the damping steel balls 10 for use.

Still be provided with valve seat 3 on the middle valve body 19, valve seat 3 keeps away from one side of output valve body 20 forms, first end cover 1 and second end cover 6 are respectively through end cover screw 2 and valve seat 3 fixed connection.

A magnetic bar 16 is arranged between the left valve core 12 and the damping seat 9, a magnetic bar 16 is also arranged between the right valve core 8 and the damping seat 9, a magnetic induction switch 14 is further arranged on the first end cover 1 and the second end cover 6, the magnetic induction switch 14 is fixed above the first end cover 1 and the second end cover 6 through a fixing screw 15, and the magnetic induction switch is respectively positioned above the first cavity and above the second cavity. After the magnetic induction switch 14 is turned on, an internal coil of the magnetic induction switch generates a small magnetic field, the small magnetic field can attract the magnetic bar 16 to move towards the direction of the magnetic induction switch, namely when the left valve core moves towards the first chamber, the magnetic bar has a promoting effect on the movement of the left valve core, the moving direction of the valve core assembly is dragged, the left valve core can quickly reach a required position, and when the right valve core moves towards the second chamber, the operation is the same.

In the invention, the central damping ring 5 is matched with the damping steel ball 10, the damping spring 11 and the damping seat 9 to form an axial damping system, and only when the resistance of the damping groove 17 in the damping seat 9 is overcome, the valve core assembly can slide left and right in the damping seat 9.

The working principle of the present invention is described with reference to fig. 1 and 2:

the first cavity 100 and the second cavity 200 are divided into two mutually sealed cavities through the valve core assembly, when the pressure of gas entering the first cavity 100 and the second cavity 200 is the same, the area of force application is increased by separating the valve core on the use side from the gas inlet cavity, the area of the valve core on the non-use side entering the gas inlet cavity is relatively small, the generated axial thrust is different, and under the combined action of the axial steep damping force consisting of the central damping ring 5, the damping seat 9, the damping steel ball 10 and the damping spring 11, the valve core assembly is enabled to move in the middle valve body 19.

Switching valve thrust balance formula:

when the left side is ventilated: f_{Left side of}+F_Damping＝F；

When the right side is ventilated: f_{Left side of}＝F_{Right side}+F_Damping。

In the formula: f_{Left side of}＝P_{Left side of}×S_{Left side of}The product of the left gas pressure and the acting area;

F_{right side}＝P_{Right side}×S_{Right side}The product of the right gas pressure and the area of action;

f damp the damping force composed of the damping seat 9, the damping steel ball 10, the damping spring 11 and the like.

If the first air inlet 21 of the first end cover 1 is first fed and the second air inlet 22 of the second end cover 6 is then fed, the valve core assembly is axially moved to the right side by the axial thrust from the left side, the right valve core 8 and the right valve core seal 7 of the valve core assembly move to the right side, so that the second chamber 200 is closed, the right valve core 8 enters the cavity B shown in fig. 2, and the left side force-bearing area S is at this time_{Left side of}Is the whole left valve core, so the right side bears the force area S_{Right side}For gas acting on the area of the end face of the right spool seal 7, S_{Left side of}Greater than S_{Right side}At this time, the left air supply passage is vented. When the left gas is about to use up, the left pressure is reduced, and at the moment, when the thrust of the end surface of the right valve core 8 of the right gas inlet is more than or equal to the superposition of the left axial thrust and the steep damping force, the damping steel balls 10 slide out of the damping grooves 17 on the right side of the central damping ring 5, and enter the smoothing stage, the left steep damping force disappears immediately, the force bearing area of the right valve core 8 at the moment is increased, the central valve core assembly moves leftwards at an accelerated speed, so that the left cavity is closed, the force bearing area on the left side is reduced, at the moment, the left gas supply device cannot give vent gas, the right passage is opened and supplies gas through the valve body, and. The same principle is reversed.

Compared with an electromagnetic valve switching valve, the pneumatic differential pressure automatic switching valve disclosed by the invention can work more safely and normally, does not generate any electric spark in the switching process, and is higher in safety. And can be switched normally under the condition of pressure difference. Compared with a membrane type switching valve, the pneumatic differential pressure automatic switching valve is difficult to be oxidized in pure oxygen, has long service life and high pressure resistance, and overcomes the defects of the membrane type switching valve. Fig. 3 is a schematic diagram of the present invention in practical use.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.