Pneumatic control valve with backflow prevention function

Abstract

The utility model relates to the technical field of pneumatic control valves, in particular to an anti-backflow pneumatic control valve, which comprises a valve body, a pneumatic chamber, a valve rod and a valve core, a valve seat matched with the valve rod is further arranged in the valve body, and the anti-backflow pneumatic control valve is characterized in that an inlet is arranged on one side of the valve body, a cavity channel is arranged on the other side of the valve body, a discharge port is connected onto the cavity channel, and the valve core is arranged in the valve body. A baffle ring is arranged in the cavity channel, a set of pistons are further arranged in the cavity channel in a sliding mode, and a spring is arranged between one end of each piston and the end of the cavity channel. Through the arrangement of the baffle ring, the piston, the spring, the chock plug, the threaded sleeve and other structures, when the pressure of a medium at one end of the inlet is large, the medium can smoothly flow into the valve body from the inlet and flow out from the discharge port, and when the pressure of a medium at one end of the discharge port is large, the medium cannot flow back into the valve body from one end of the discharge port. The effect of preventing media from flowing back is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic control valve technical field, specifically, relate to a kind of with the pneumatic control valve of backflow prevention. BACKGROUND

[0002] Pneumatic control valve is with compressed gas as power source, with cylinder as actuator, and with the help of valve positioner, converter, solenoid valve, position valve, gas tank, gas filter and other accessories to drive valve.

[0003] The existing pneumatic control valve usually does not have the function of preventing medium backflow, when normally used, the medium pressure on the side of the inlet is higher, at this time, the medium will flow into the valve from the side of the inlet, and flow out from the outlet of the valve body, and when the medium pressure on the outlet is higher, the medium will backflow from the outlet to the valve, and flow out from the inlet of the valve body, at this time, the backflowing medium may cause damage to the equipment connected to the valve body. SUMMARY

[0004] The utility model provides a kind of with the pneumatic control valve of backflow prevention, solve the technical problem that pneumatic control valve does not have the function of preventing medium backflow in prior art.

[0005] In view of the above problems, the technical scheme provided by the utility model is:

[0006] A kind of with the pneumatic control valve of backflow prevention, including valve body, pneumatic chamber, valve stem and valve core, the inside of valve body is also provided with the valve seat matched with the valve stem, characterized by, one side of the valve body is provided with inlet, the other side of the valve body is provided with cavity, the cavity is connected with outlet, the inside of the cavity is provided with barrier ring, the inside of the cavity is also slidably provided with a group of pistons, the one end of the piston is provided with spring between the end of the cavity, the other end of the piston is fixedly connected with the plug for plugging the barrier ring.

[0007] Further, the inner surface of the barrier ring and the outer surface of the plug are mutually matched arc structures.

[0008] Further, the end of the cavity is provided with a threaded sleeve, the threaded sleeve is internally threadedly connected with a bolt, one end of the bolt extends into the inner end of the cavity and is connected with a contact plate, and the two ends of the spring are in contact between the contact plate and the piston.

[0009] Further, the valve body is made of cast iron, and an electroplated corrosion-resistant layer is arranged on the surface of the valve body.

[0010] Further, the surface of the outlet and the inlet is provided with an identification arrow.

[0011] Further, a filter screen is installed on the outside of the inlet.

[0012] Compared with the prior art, the utility model discloses the beneficial effects are: through the setting of the baffle ring, piston, spring, plug and the structure such as the screw bush, when the medium pressure of one end of the inlet is bigger, it can flow from the inlet to the valve body and from the discharge port, and when the medium pressure of one end of the discharge port is bigger, it cannot flow back to the valve body from one end of the discharge port, realize the medium backflow prevention effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be needed to use the drawings in the embodiment briefly introduced, should understand, the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0014] Fig. 1 It is the overall structure schematic diagram of the utility model;

[0015] Fig. 2 It is the structure schematic diagram of the cavity and the discharge port in the utility model;

[0016] Fig. 3 It is the sectional view of the utility model;

[0017] Fig. 4 It is the split structure schematic diagram of the cavity and the piston in the utility model.

[0018] In the drawing: 1, valve body;2, pneumatic chamber;3, valve stem;4, valve core;5, valve seat;6, inlet;7, cavity;8, discharge port;9, baffle ring;10, piston;11, spring;12, plug;13, screw bush;14, bolt;15, abutment plate;16, identification arrow;17, filter screen. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clearly, the following will be combined with the drawings in the utility model embodiment, and the technical scheme in the utility model embodiment is clearly and completely described, obviously, the described embodiment is a part of the embodiment of the utility model, instead of all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by ordinary skilled person in the art without making the creative labor belong to the scope of the utility model protection.

[0020] The following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but merely represents the preferred embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the application.

[0021] Please refer to Figs. 1-4 The application discloses a backflow-proof pneumatic regulating valve, which comprises a valve body 1, a pneumatic chamber 2, a valve rod 3 and a valve core 4. The valve body 1 is internally provided with a valve seat 5 matched with the valve rod 3. The pneumatic chamber 2 drives the valve rod 3 to move up and down by charging or discharging air to the top end of the valve core 4, so as to adjust the distance between the valve rod 3 and the valve seat 5, thereby controlling the opening and closing and the opening degree of the regulating valve. One side of the valve body 1 is provided with an inlet 6, and the other side of the valve body 1 is provided with a cavity 7. The cavity 7 is connected with an outlet 8. The end portions of the inlet 6 and the outlet 8 are used for being connected with external pipelines. The cavity 7 is internally provided with a blocking ring 9, which is located at the front side of the outlet 8. The cavity 7 is internally further provided with a group of pistons 10, which can slide horizontally in the cavity 7. A spring 11 is arranged between one end of the piston 10 and the end portion of the cavity 7. The other end of the piston 10 is fixedly connected with a plug 12 used for blocking the blocking ring 9, which can generate an elastic pushing action to the left of the piston 10. Under the action, the plug 12 is always subjected to the left action force and abuts against the blocking ring 9, thereby being capable of blocking the blocking ring 9.

[0022] The end of the inlet port 6 and the outlet port 8 is connected to an external pipeline, when the medium pressure at one end of the inlet port 6 is large, the medium will flow into the valve body 1 through the inlet port 6, and from the valve body 1 into the cavity 7, when the medium flowing into the cavity 7 from the valve body 1 contacts the left side of the plug 12, the left side of the plug 12 will be subjected to the pressure of the medium, at this time the plug 12 will move to the right under the action of the pressure and move away from one side of the blocking ring 9, at the same time the piston 10 will also move to the right under the action of the plug 12, so that the spring 11 is compressed under stress, because the plug 12 is pushed away from the blocking ring 9 by the pressure of the medium at this time, the plug 12 no longer blocks the blocking ring 9, and then the medium can flow out from the outlet port 8 through the blocking ring 9, and when the medium pressure at one end of the outlet port 8 is large, the medium will flow into the cavity 7 from the outlet port 8, at this time the left side of the plug 12 is no longer subjected to the pressure, the piston 10 will move to the left under the action of the elastic force of the spring 11, and drive the plug 12 to move to the left and approach the blocking ring 9, when the plug 12 abuts against the blocking ring 9, it can block the blocking ring 9, the medium flowing into the cavity 7 cannot enter the valve body 1 through the blocking ring 9, in summary, when the medium pressure at one end of the inlet port 6 is large, it can smoothly flow into the valve body 1 from the inlet port 6 and flow out from the outlet port 8, and when the medium pressure at one end of the outlet port 8 is large, it cannot flow back from one end of the outlet port 8 into the valve body 1, achieving the effect of preventing medium backflow.

[0023] Further, please refer to Figs. 1-4 , the inner surface of the blocking ring 9 and the outer surface of the plug 12 are arc-shaped structures that fit each other, when the plug 12 abuts against the blocking ring 9 to block it, the gap between the arc-shaped contact surfaces of the plug 12 and the blocking ring 9 is small, so that they can fit each other more tightly, thereby ensuring the blocking effect of the plug 12 on the blocking ring 9.

[0024] Further, please refer to Figs. 1-4 , the end of the cavity 7 is provided with a threaded sleeve 13, the threaded sleeve 13 is internally threaded connected with a bolt 14, one end of the bolt 14 extends into the inner end of the cavity 7 and is connected with an abutting plate 15, the two ends of the spring 11 abut between the abutting plate 15 and the piston 10, by rotating the bolt 14, it can move to the inside or outside of the cavity 7 under the driving action of the threaded sleeve 13, thereby adjusting the distance between the abutting plate 15 and the piston 10, and adjusting the compression length of the spring 11 therebetween, so that the user can adjust the elastic force of the spring 11 on the piston 10 according to the needs, improving the applicability of the structure.

[0025] Further, the valve body 1 is made of cast iron, which has high strength and is not easy to deform under the action of the pressure of the medium, and its surface is provided with an electroplated corrosion-resistant layer to avoid rusting of the whole valve body 1, further ensuring its service life.

[0026] Further, please refer to Figs. 1-4 The surface of the outlet 8 and the inlet 6 is provided with an identification arrow 16, which indicates the flow direction of the medium, avoiding the user from installing in error to cause the inlet 6 and the outlet 8 to be reversed.

[0027] Further, please refer to Figs. 1-4 The outer side of the inlet 6 is provided with a filter screen 17, and the medium flows into the valve body 1 through the filter screen 17 and is filtered by the filter screen 17, so that the impurities in the medium are intercepted outside, avoiding the impurities from entering the valve body 1 to cause blockage.

[0028] The above is only the preferred embodiment of the present application, and is not used to limit the present application, and for those skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pneumatic regulating valve with anti-backflow, comprising a valve body (1), a pneumatic chamber (2), a valve stem (3) and a valve core (4), the inside of the valve body (1) is further provided with a valve seat (5) matched with the valve stem (3), characterized in that, One side of the valve body (1) is provided with an inlet (6), the other side of the valve body (1) is provided with a cavity (7), the cavity (7) is connected with an outlet (8), the inside of the cavity (7) is provided with a blocking ring (9), the inside of the cavity (7) is also provided with a group of pistons (10) which are slidably arranged, the one end of the piston (10) is provided with a spring (11) between the end of the cavity (7), the other end of the piston (10) is fixedly connected with a plug (12) which is used for blocking the blocking ring (9).

2. The pneumatic control valve with backflow prevention according to claim 1, characterized in that The inner surface of the blocking ring (9) and the outer surface of the plug (12) are mutually matched arc structures.

3. The anti-backflow pneumatic control valve according to claim 1, wherein The end of the cavity (7) is provided with a screw sleeve (13), the inside of the screw sleeve (13) is threadedly connected with a bolt (14), the one end of the bolt (14) extends into the inner end of the cavity (7) and is connected with a resisting plate (15), the two ends of the spring (11) abut against the resisting plate (15) and the piston (10).

4. The anti-backflow pneumatic control valve according to claim 1, wherein The valve body (1) is made of cast iron and is provided with an electroplated anticorrosive layer on the surface.

5. The anti-backflow pneumatic control valve according to claim 1, wherein The surface of the outlet (8) and the inlet (6) is provided with a mark arrow (16).

6. The anti-backflow pneumatic control valve according to claim 1, wherein The outside of the inlet (6) is mounted with a filter screen (17).

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