Three-stage pressure reducing valve

Abstract

The utility model discloses a three-stage pressure reducing valve which comprises a valve body, an air inlet connector is arranged on the left side of the valve body, the air inlet connector is connected with an air inlet connector, a first-stage pressure reducing chamber is arranged on the right side of the valve body, and the first-stage pressure reducing chamber is communicated with the air inlet connector. A second-stage pressure reducing chamber is arranged at the lower end of the valve body, and the second-stage pressure reducing chamber is communicated with the first-stage pressure reducing chamber through a first air channel; a third-stage pressure reducing chamber is arranged at the upper end of the valve body and communicates with the second-stage pressure reducing chamber through a second air channel. An air outlet connector is formed in the rear side of the valve body and connected with an air outlet connector, and the air outlet connector communicates with the third-stage pressure reduction chamber through a third air channel. By arranging the three-stage pressure reduction chamber and the elastic elements such as the spring and the disc spring matched with the three-stage pressure reduction chamber, a multi-stage pressure division structure is formed, pressure reduction adjustment of high-pressure gas can be achieved for a long time, and the multi-stage pressure reduction chamber is suitable for scenes with different pressure requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure reducing valve technical field, concretely relates to a three-stage pressure reducing valve. BACKGROUND

[0002] In the field of fluid control, especially in the industrial scene with high requirements for gas pressure stability, the performance of the pressure reducing valve directly affects the system operation precision and reliability. Most of the pressure reducing valves in the prior art adopt single-stage or two-stage pressure reducing mode, and only a single spring or a simple elastic element is used to realize pressure regulation, lacking a coordinated control mechanism for multi-stage pressure division, resulting in narrow pressure regulation range, insufficient precision and difficulty in realizing stable stepwise pressure reduction when facing large fluctuations in gas source pressure, which is easy to cause faults of downstream equipment due to unstable pressure.

[0003] Based on the above situation, the utility model provides a three-stage pressure reducing valve, which can effectively solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model provides a three-stage pressure reducing valve in view of the condition of prior art, overcomes the above defects.

[0005] The utility model realizes by the following technical scheme:

[0006] A three-stage pressure reducing valve, comprising a valve body, a gas inlet is arranged on the left side of the valve body, a gas inlet joint is connected to the gas inlet, a first-stage pressure reducing chamber is arranged on the right side of the valve body, and the first-stage pressure reducing chamber is in communication with the gas inlet; a piston rod is installed in the first-stage pressure reducing chamber, a valve cap is connected to the left end of the piston rod, a compression nut is arranged on the right side of the piston rod, the compression nut is threadedly connected with the valve body, a piston ring and a first spring are sleeved on the outer side of the piston rod, and the two ends of the first spring are respectively in abutment with the piston ring and the end of the piston rod; a second-stage pressure reducing chamber is arranged on the lower end of the valve body, the second-stage pressure reducing chamber is in communication with the first-stage pressure reducing chamber through a first gas channel; a third-stage pressure reducing chamber is arranged on the upper end of the valve body, the third-stage pressure reducing chamber is in communication with the second-stage pressure reducing chamber through a second gas channel; a disc spring is installed in the second-stage pressure reducing chamber and the third-stage pressure reducing chamber, one end of the disc spring is fixedly connected with a disc spring seat, a valve cover is arranged on one side of the disc spring seat, and the valve cover is threadedly connected with the valve body; the other end of the disc spring is in abutment with a disc spring cover, and the disc spring cover is in abutment with an opening and closing thimble; a valve seat is installed at the port of the first gas channel and the second gas channel, and a sealing ring is fixedly installed in the valve seat; a second spring is installed in the first gas channel and the second gas channel, one end of the second spring is in abutment with a steel ball, and the other end of the steel ball is in abutment with the end of the opening and closing thimble; a gas outlet is arranged on the back side of the valve body, a gas outlet joint is connected to the gas outlet, and the gas outlet is in communication with the third-stage pressure reducing chamber through a third gas channel.

[0007] According to the above technical scheme, as a further preferred technical scheme of the above technical scheme, a filter core is internally installed in the air inlet interface, and a left end surface of the filter core and a right end surface of the air inlet joint are mutually attached.

[0008] According to the above technical scheme, as a further preferred technical scheme of the above technical scheme, a pressure regulating screw is threadedly connected to the valve cover outside the three-stage pressure reducing chamber, and a bottom end of the pressure regulating screw and the disc spring seat are in abutment with each other.

[0009] According to the above technical scheme, as a further preferred technical scheme of the above technical scheme, the piston rod has a vent hole inside.

[0010] According to the above technical scheme, as a further preferred technical scheme of the above technical scheme, a process hole is communicated with the second air passage, and a plug is connected to an outer end of the process hole.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0012] The three-stage pressure reducing valve has the advantages of precise pressure regulation, reliable sealing performance, and the like, and is suitable for the industrial field requiring stable low-pressure gas sources. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a cross-sectional structure schematic view of the front view direction of the utility model;

[0014] Figure 2 It is a cross-sectional structure schematic view of the right view direction of the utility model. DETAILED DESCRIPTION

[0015] In order to make the technical personnel in the art better understand the technical scheme of the utility model, the preferred implementation scheme of the utility model is described below in combination with specific implementation examples, but it should be understood that the drawings are only used for exemplary description, and cannot be understood as the limitation of the patent; in order to better illustrate the embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for the technical personnel in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for exemplary description, and cannot be understood as the limitation of the patent.

[0016] The utility model provides a kind of three-stage pressure reducing valve, including valve body 1, the left side of the valve body 1 is provided with air inlet 2, air inlet 3 is connected with the air inlet 2, the right side of the valve body 1 is provided with primary pressure reducing chamber 4, and the primary pressure reducing chamber 4 is interconnected with air inlet 2;Piston rod 5 is installed in the primary pressure reducing chamber 4, the left end of the piston rod 5 is connected with valve cap 6, the right side of the piston rod 5 is provided with compression nut 7, and the compression nut 7 is threadedly connected with valve body 1, the outside of the piston rod 5 is equipped with piston ring 8 and first spring 9, and the two ends of the first spring 9 are respectively mutually abutted with piston ring 8 and the end of piston rod 5;The lower end of the valve body 1 is provided with secondary pressure reducing chamber 10, and the secondary pressure reducing chamber 10 is interconnected with the primary pressure reducing chamber 4 by first air passage 11;The upper end of the valve body 1 is provided with tertiary pressure reducing chamber 12, and the tertiary pressure reducing chamber 12 is interconnected with the secondary pressure reducing chamber 10 by second air passage 13;Disc spring 14 is installed in the secondary pressure reducing chamber 10 and the tertiary pressure reducing chamber 12, one end of the disc spring 14 is fixedly connected with disc spring seat 15, one side of the disc spring seat 15 is provided with valve cover 16, and the valve cover 16 is threadedly connected with valve body 1;The other end of the disc spring 14 is abutted with disc spring cover 17, and the disc spring cover 17 is abutted with open-close needle 18;Valve seat 19 is installed at the port of the first air passage 11 and the second air passage 13, and sealing ring 20 is fixedly installed in the valve seat 19;Second spring 21 is installed in the first air passage 11 and the second air passage 13, one end of the second spring 21 is abutted with steel ball 22, and the other end of the steel ball 22 is mutually abutted with the end of open-close needle 18;The rear side of the valve body 1 is provided with air outlet 23, the air outlet 23 is connected with air outlet 24, and the air outlet 23 is interconnected with the tertiary pressure reducing chamber 12 by third air passage 25.

[0017] The utility model discloses a three-stage pressure reducing chamber and the spring, disc spring and other elastic elements matched with it are arranged, a multistage pressure division structure is formed, high-pressure gas can be regulated for a long time, and different pressure demand scenes are adapted.

[0018] Further, in another embodiment, a filter core 26 is installed in the air inlet 2, and the left end face of the filter core 26 is in close contact with the right end face of the air inlet 3.

[0019] By arranging the filter core 26, impurities in the gas can be intercepted, and the gas passage is prevented from being blocked by impurities, so that the gas flows smoothly and the pressure reduction accuracy is ensured.

[0020] Further, in another embodiment, the valve cover 16 outside the tertiary pressure reducing chamber 12 is threadedly connected with a pressure regulating screw rod 27, and the bottom end of the pressure regulating screw rod 27 is abutted with the disc spring seat 15.

[0021] By setting the pressure regulating screw 27, the disc spring seat 15 can be pushed to move axially by rotating the pressure regulating screw 27, the compression amount of the disc spring 14 is changed, and thus the pressure threshold of the three-stage pressure reducing chamber 12 is adjusted.

[0022] Further, in another embodiment, the inside of the piston rod 5 has a vent hole 51.

[0023] Further, in another embodiment, the second gas passage 13 is communicated with a process hole 28, and the outer end of the process hole 28 is connected with a plug 29.

[0024] By setting the process hole 28, pressure test and air tightness detection can be used in the production assembly process, and debugging and maintenance are facilitated.

[0025] The working principle of one embodiment of the utility model is as follows:

[0026] First, the high-pressure gas enters the gas inlet 2 through the gas inlet connector 3, flows into the first-stage pressure reducing chamber 4 from the left side of the valve body after being filtered by the filter element 26, the high-pressure gas pushes the piston rod 5 to move rightwards, the piston ring 8 sleeved outside the piston rod forms dynamic sealing with the inner wall of the valve body 1, and gas leakage to the non-pressure reducing area is prevented, while the vent hole 51 penetrating through the inside of the piston rod guides part of the gas flow to pass through synchronously, balances the gas flow impact on both sides of the piston rod, and when the gas pressure and the first spring elastic force reach balance, the piston rod stops moving, and the first-stage pressure reducing process is completed.

[0027] The gas after the first-stage pressure reduction needs to flow to the second-stage pressure reducing chamber 10 through the first gas passage 11, and the sealing ring 20 in the valve seat 19 of the first gas passage 11 port is preliminarily sealed, and the gas flow needs to overcome the resistance of the steel ball 22 pushed by the second spring 21 to push away the steel ball and enter the first gas passage; subsequently, the gas enters the second-stage pressure reducing chamber 10 at the lower end of the valve body 1 through the first gas passage, the pressure acts on the internal disc spring 14, the disc spring cover 17 and the open-close center 18 abutting against the disc spring cover 17 are pushed, the disc spring 14 is deformed to store energy, when the gas pressure and the disc spring 14 elastic force reach balance, the open-close center 18 abuts against the steel ball 22, the gas flow is blocked from further input, the pressure of the second-stage pressure reducing chamber 10 is stabilized, and the excess gas flows back to the first-stage pressure reducing chamber 4 through the gas passage to form dynamic balance.

[0028] Then, the gas after the second-stage pressure reduction enters the third-stage pressure reducing chamber 12 at the upper end of the valve body 1 through the second gas passage 13, and the third-stage pressure reducing chamber is reduced again by the disc spring 14 and the open-close center 18 through similar principles, the pressure regulating screw 27 is screwed on the valve cover 16 outside the third-stage pressure reducing chamber, the bottom end of the pressure regulating screw 27 directly abuts against the disc spring seat 15, the pre-tightening force of the disc spring 14 can be accurately adjusted by rotating the pressure regulating screw 27, the fine setting of the output pressure is realized, finally, the stable low-pressure gas after the third-stage pressure reduction flows out from the gas outlet interface 23 at the rear side of the valve body 1 through the gas outlet connector 24 to the downstream equipment through the gas outlet connector 24.

[0029] According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use the utility model of a three-stage pressure reducing valve, and the positive effects described in the utility model can be achieved.

[0030] Unless otherwise specified and limited, in the utility model, if there are terms such as 'length', 'width', 'upper', 'lower', 'front','rear', 'left', 'right','vertical', 'horizontal', 'top', 'bottom', 'inner', 'outer', 'clockwise', 'counterclockwise', 'axial', 'radial', 'circumferential', etc. Indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing the orientation or positional relationship in the utility model are only used for exemplary description, and cannot be understood as a limitation on the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances in combination with the drawings.

[0031] Unless otherwise specified and limited, in the utility model, if there are terms such as'setting', 'connection' and 'connection', they should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, any simple modification, equivalent change made according to the technical essence of the utility model to the above embodiment falls within the protection scope of the utility model.

Claims

1. A three-stage pressure reducing valve, characterized in that: The system includes a valve body (1), an air inlet (2) on the left side of the valve body (1), an air inlet connector (3) connected to the air inlet (2), a primary pressure reducing chamber (4) on the right side of the valve body (1), the primary pressure reducing chamber (4) being interconnected with the air inlet (2); a piston rod (5) is installed inside the primary pressure reducing chamber (4), a valve cap (6) is connected to the left end of the piston rod (5), a clamping nut (7) is provided on the right side of the piston rod (5), the clamping nut (7) being threadedly connected to the valve body (1), and the piston rod (5) being threadedly connected to the valve body (1). A piston ring (8) and a first spring (9) are fitted on the outer side of the piston rod (5). The two ends of the first spring (9) abut against the ends of the piston ring (8) and the piston rod (5), respectively. A secondary pressure reducing chamber (10) is provided at the lower end of the valve body (1). The secondary pressure reducing chamber (10) is connected to the primary pressure reducing chamber (4) through a first air passage (11). A tertiary pressure reducing chamber (12) is provided at the upper end of the valve body (1). The tertiary pressure reducing chamber (12) is connected to the secondary pressure reducing chamber (10) through a second air passage (13). Disc springs (14) are installed inside both the decompression chamber (10) and the third-stage decompression chamber (12). One end of the disc spring (14) is fixedly connected to a disc spring seat (15). A valve cover (16) is provided on one side of the disc spring seat (15), and the valve cover (16) is threadedly connected to the valve body (1). The other end of the disc spring (14) abuts against a disc spring cover (17), and the disc spring cover (17) abuts against an opening and closing pin (18). A valve seat (19) is installed at the port of both the first air passage (11) and the second air passage (13). A sealing ring (20) is fixedly installed inside the valve body (1); a second spring (21) is installed inside the first air passage (11) and the second air passage (13), one end of the second spring (21) abuts against a steel ball (22), and the other end of the steel ball (22) abuts against the end of the opening and closing pin (18); an air outlet (23) is provided on the rear side of the valve body (1), the air outlet (23) is connected to an air outlet connector (24), and the air outlet (23) is connected to the third air passage (25) and the third-stage pressure reducing chamber (12).

2. The three-stage pressure reducing valve according to claim 1, characterized in that: The air intake port (2) is equipped with a filter element (26), and the left end face of the filter element (26) is in contact with the right end face of the air intake connector (3).

3. A three-stage pressure reducing valve according to claim 1, characterized in that: The valve cover (16) on the outside of the three-stage pressure reducing chamber (12) is threadedly connected to a pressure regulating screw (27), and the bottom end of the pressure regulating screw (27) abuts against the disc spring seat (15).

4. A three-stage pressure reducing valve according to claim 1, characterized in that: The piston rod (5) has a vent hole (51) inside.

5. A three-stage pressure reducing valve according to claim 1, characterized in that: The second air passage (13) is connected to a process hole (28), and a plug (29) is connected to the outer end of the process hole (28).

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