阅读说明：本技术 气压调节阀、精密组合阀以及精密组合阀气体余量检测装置 (Air pressure regulating valve, precision combination valve and gas allowance detection device of precision combination valve ) 是由 林剑锋 陈汉斌 于 2021-06-29 设计创作，主要内容包括：本发明公开了一种气压调节阀、精密组合阀以及精密组合阀气体余量检测装置,所述气压调节阀在传动的直动式气压调节阀的基础上,由原有的一个阀芯增加至两个阀芯,且对应地在阀座上开设有两个出气通道。通过调节组件和活动组件调节出气通道的开启和闭合。在进行排气时,两个阀芯都可进行排气,从而提高了气压调节阀所能调节的气压范围,即调节范围,以及调节效率。(The invention discloses an air pressure regulating valve, a precision combination valve and a precision combination valve gas allowance detection device. The opening and closing of the air outlet channel are adjusted through the adjusting assembly and the movable assembly. When exhausting, both valve cores can exhaust, so that the air pressure range, namely the adjusting range, which can be adjusted by the air pressure adjusting valve is improved, and the adjusting efficiency is improved.)

1. An air pressure regulating valve, comprising: the valve core assembly comprises a first valve core, a first spring, a second valve core and a second spring;

the inner cavity of the upper valve seat and the inner cavity of the lower valve seat are provided with a first valve core in a matching way, and the lower valve seat and the lower baffle are provided with a second valve core in an up-and-down matching way;

the upper valve seat and the lower valve seat are provided with a first movable area in the splicing area, and the first valve core can move up and down in the first movable area;

a second movable area is arranged in the area where the lower block baffle is abutted to the lower valve seat, and the second valve core can move up and down in the second movable area;

the first spring is arranged between the first valve core and the inner cavity of the upper valve seat, one end of the first spring is matched with the upper valve seat, and the other end of the second spring is sleeved in the inner cavity of the first valve core;

the second spring is arranged between the second valve core and the lower baffle plate, one end of the second spring is matched with the lower baffle plate, and the other end of the second spring is sleeved in an inner cavity of the second valve core;

an air inlet channel and an air outlet channel are respectively formed in the side edge of the lower valve seat, wherein the air outlet channel comprises a first air outlet channel and a second air outlet channel;

the gas inlet channel is separated from the first gas outlet channel through a first valve core, and the gas inlet channel is separated from the second gas outlet channel through a second valve core;

the first valve core, the second valve core, the first spring and the second spring respectively penetrate through a pull rod assembly;

the upper valve seat is connected with the lower valve seat in an inserting mode, and the lower baffle abuts against the lower valve seat;

the adjusting piece is connected with the pull rod assembly so as to adjust the initial positions of the first valve core and the second valve core through the pull rod assembly.

2. The air pressure regulating valve of claim 1, wherein said regulating member is a regulating cap;

the outer wall of the upper valve seat is provided with a first convex pattern, and the inner wall of the adjusting cap is provided with a buckle matched with the first convex pattern;

the end face of the pull rod assembly abutted to the adjusting cap is polygonal, a polygonal groove matched with the polygon is formed in the inner bottom face of the adjusting cap, and the adjusting cap is matched and connected with the pull rod assembly through the end face and the polygonal groove.

3. The air pressure regulating valve according to claim 1, wherein a first groove is formed in the matching surface of the lower block baffle and the lower valve seat, and the first groove is in interference fit with a first sealing element; and/or the first and/or second light sources,

a second groove is formed in the matching surface of the first valve core and the lower baffle plate, and the second groove is in interference fit with a second sealing element; and/or the first and/or second light sources,

and a third groove is formed in the matching surface of the second valve core and the first valve seat, and the third groove is in interference fit with a third sealing element.

4. The air pressure regulator valve according to claim 1, wherein the intake passage includes an intake throttle opening and an intake passage opening, wherein the intake throttle opening has a smaller inner diameter than the intake passage opening;

the air outlet channel comprises an air outlet throttling port and an air outlet channel port, wherein the inner diameter of the air outlet throttling port is smaller than that of the air outlet channel port.

5. The air pressure regulating valve according to claim 1, wherein the upper valve seat comprises a first valve seat and a second valve seat, the first valve seat is connected with the lower valve seat in a plugging manner, and the second valve seat is fixedly connected with the first valve seat;

aiming at the first valve seat, a first connecting channel is arranged on one surface, which is in contact with the second valve seat, of the first valve seat;

aiming at the second valve seat, a second connecting channel is arranged on one surface, which is in contact with the first valve seat, of the second valve seat;

the first connecting channel corresponds to the second connecting channel and is used for connecting the inner cavity of the first valve seat with the inner cavity of the second valve seat.

6. The air pressure regulating valve of claim 1, wherein the second valve seat comprises an upper gland and an upper air cavity, wherein a side of the upper gland is provided with a balancing passage for connecting with a load balancing device and introducing air into the load balancing device;

the pull rod assembly comprises a middle pull rod, an upper spring, an exhaust valve core, an adjusting piece, a lower spring and an adjusting piston;

the middle pull rod sequentially penetrates through the second spring, the second valve core, the first valve core and the first spring from bottom to top until the middle pull rod is fixedly connected with the adjusting piston in the cavity of the first valve seat;

one end of the lower spring is sleeved with the adjusting piston, and the other end of the lower spring is fixedly connected with the inner surface of the first valve seat;

one end of the adjusting piece is in interference fit with the through hole of the upper gland and is abutted against the upper gland, and the other end of the adjusting piece is sleeved with the upper spring;

one end of the exhaust valve core is sleeved with the upper spring and is opposite to the second connecting channel.

7. The air pressure regulating valve according to claim 6, wherein the exhaust valve core comprises an exhaust top cap, an exhaust steel ball and an exhaust core;

the exhaust core is of a tubular structure, one end of the exhaust core is in interference fit with a second connecting channel, the other end of the exhaust core is provided with the exhaust steel ball, a plurality of through holes are formed in the positions, opposite to the exhaust steel ball, of the exhaust core, and the second connecting channel is separated from the through holes by the exhaust steel ball;

the exhaust top cap is in a bell-shaped shape gradually widening from top to bottom, the inside of the exhaust top cap is opposite to the exhaust steel ball, and the exhaust top cap is sleeved inside the upper spring;

the upper gland is matched with the upper air cavity to form a top cap moving area, the exhaust top cap moves up and down in the top cap moving area, and the outer wall of the exhaust top cap, which is positioned in the top cap moving area, is provided with a plurality of exhaust holes;

when the exhaust top cap moves to contact with the upper gland, the exhaust top cap separates the upper gland from the top cap moving area.

8. The air pressure regulating valve according to claim 1, wherein a sealing gasket is disposed between the exhaust top cap and the upper air chamber, and the outer edge of the sealing gasket is tightly connected to the upper air chamber and the second valve seat, and the inner edge of the sealing gasket is tightly connected to the exhaust core and the first valve seat.

9. A precision combination valve, characterized in that, the middle valve in the precision combination valve is the air pressure adjusting valve according to any one of claims 1 to 8.

10. A gas allowance detection device of a precision combination valve, which is characterized in that the detection device comprises a water tank, a floating plate and the precision combination valve as claimed in claim 9;

the water tank is provided with a transparent part, and the transparent part is provided with scales;

the precise combination valve is fixed on the floating plate;

when the precise combination valve operates, the current gas quantity of the precise combination valve is determined according to the floating plate and the scales.

Technical Field

The present invention relates to a regulating valve, and more particularly, to a gas pressure regulating valve, a precision combination valve, and a gas remaining amount detecting device for a precision combination valve.

Background

The regulating valve is used for all elements of hydraulic and pneumatic systems, such as a power element, a control element, an actuator element, an auxiliary element and the like. The regulating valves are various in types and widely applied to various industries such as engineering machinery, agricultural machinery, metallurgical mining machinery, plastic machinery and the like. The regulating valve is used as a key technology for transmission and control, and is a core technology and a basic component technology which are widely applied in the industrial field.

The air pressure regulating valve is a gas pressure control valve, can perform constant pressure overflow, realizes the control of gas flow on one hand, and can protect the system safety on the other hand. However, the existing relief valve has a small hole, so that the hole is often blocked when the relief valve works for a period of time, and the whole regulating valve cannot achieve the pressure balancing function. In addition, when the input air pressure is strong, the existing small holes cannot effectively deal with the input pressure, and the adjustment efficiency and the adjustment range are limited.

Disclosure of Invention

The invention aims to solve the technical problems that the hole of the existing regulating valve is small, and the existing regulating valve has limitations in pressure balancing efficiency and regulating range, and provides an air pressure regulating valve aiming at the defects of the prior art.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

an air pressure regulating valve, comprising:

the pneumatic control valve comprises a regulating part, an upper valve seat, a lower baffle and a valve core assembly, wherein the valve core assembly comprises a first valve core, a first spring, a second valve core and a second spring;

the inner cavity of the upper valve seat and the inner cavity of the lower valve seat are provided with a first valve core in a matching way, and the lower valve seat and the lower baffle are provided with a second valve core in an up-and-down matching way;

the upper valve seat and the lower valve seat are provided with a first movable area in the splicing area, and the first valve core can move up and down in the first movable area;

a second movable area is arranged in the area where the lower block baffle is abutted to the lower valve seat, and the second valve core can move up and down in the second movable area;

the first spring is arranged between the first valve core and the inner cavity of the upper valve seat, one end of the first spring is matched with the upper valve seat, and the other end of the second spring is sleeved in the inner cavity of the first valve core;

the second spring is arranged between the second valve core and the lower baffle plate, one end of the second spring is matched with the lower baffle plate, and the other end of the second spring is sleeved in an inner cavity of the second valve core;

an air inlet channel and an air outlet channel are respectively formed in the side edge of the lower valve seat, wherein the air outlet channel comprises a first air outlet channel and a second air outlet channel;

the gas inlet channel is separated from the first gas outlet channel through a first valve core, and the gas inlet channel is separated from the second gas outlet channel through a second valve core;

the first valve core, the second valve core, the first spring and the second spring respectively penetrate through a pull rod assembly;

the upper valve seat is connected with the lower valve seat in an inserting mode, and the lower baffle abuts against the lower valve seat;

the adjusting piece is connected with the pull rod assembly so as to adjust the initial positions of the first valve core and the second valve core through the pull rod assembly.

The air pressure regulating valve, wherein the regulating part is a regulating cap;

the outer wall of the upper valve seat is provided with a first convex pattern, and the inner wall of the adjusting cap is provided with a buckle matched with the first convex pattern;

the end face of the pull rod assembly abutted to the adjusting cap is polygonal, a polygonal groove matched with the polygon is formed in the inner bottom face of the adjusting cap, and the adjusting cap is matched and connected with the pull rod assembly through the end face and the polygonal groove.

The air pressure regulating valve is characterized in that a first groove is formed in the matching surface of the lower block baffle and the lower valve seat, and the first groove is in interference fit with a first sealing element; and/or the first and/or second light sources,

a second groove is formed in the matching surface of the first valve core and the lower baffle plate, and the second groove is in interference fit with a second sealing element; and/or the first and/or second light sources,

and a third groove is formed in the matching surface of the second valve core and the first valve seat, and the third groove is in interference fit with a third sealing element.

The air pressure regulating valve, wherein the air inlet passage comprises an air inlet throttle orifice and an air inlet passage orifice, wherein the inner diameter of the air inlet throttle orifice is smaller than that of the air inlet passage orifice;

the air outlet channel comprises an air outlet throttling port and an air outlet channel port, wherein the inner diameter of the air outlet throttling port is smaller than that of the air outlet channel port.

The upper valve seat comprises a first valve seat and a second valve seat, the first valve seat is connected with the lower valve seat in an inserting manner, and the second valve seat is fixedly connected with the first valve seat;

aiming at the first valve seat, a first connecting channel is arranged on one surface, which is in contact with the second valve seat, of the first valve seat;

aiming at the second valve seat, a second connecting channel is arranged on one surface, which is in contact with the first valve seat, of the second valve seat;

the first connecting channel corresponds to the second connecting channel and is used for connecting the inner cavity of the first valve seat with the inner cavity of the second valve seat.

The second valve seat comprises an upper gland and an upper air cavity, wherein a balance channel is arranged on one side of the upper gland and is used for being connected with a load balancing device and guiding air into the load balancing device;

the pull rod assembly comprises a middle pull rod, an upper spring, an exhaust valve core, an adjusting piece, a lower spring and an adjusting piston;

the middle pull rod sequentially penetrates through the second spring, the second valve core, the first valve core and the first spring from bottom to top until the middle pull rod is fixedly connected with the adjusting piston in the cavity of the first valve seat;

one end of the lower spring is sleeved with the adjusting piston, and the other end of the lower spring is fixedly connected with the inner surface of the first valve seat;

one end of the adjusting piece is in interference fit with the through hole of the upper gland and is abutted against the upper gland, and the other end of the adjusting piece is sleeved with the upper spring;

one end of the exhaust valve core is sleeved with the upper spring and is opposite to the second connecting channel.

The air pressure regulating valve, wherein the exhaust valve core comprises an exhaust top cap, an exhaust steel ball and an exhaust core;

the exhaust core is of a tubular structure, one end of the exhaust core is in interference fit with a second connecting channel, the other end of the exhaust core is provided with the exhaust steel ball, a plurality of through holes are formed in the positions, opposite to the exhaust steel ball, of the exhaust core, and the second connecting channel is separated from the through holes by the exhaust steel ball;

the exhaust top cap is in a bell-shaped shape gradually widening from top to bottom, the inside of the exhaust top cap is opposite to the exhaust steel ball, and the exhaust top cap is sleeved inside the upper spring;

the upper gland is matched with the upper air cavity to form a top cap moving area, the exhaust top cap moves up and down in the top cap moving area, and the outer wall of the exhaust top cap, which is positioned in the top cap moving area, is provided with a plurality of exhaust holes;

when the exhaust top cap moves to contact with the upper gland, the exhaust top cap separates the upper gland from the top cap moving area.

The air pressure regulating valve is characterized in that a sealing gasket is arranged between the exhaust top cap and the upper air cavity, the outer edge of the sealing gasket is tightly connected with the upper air cavity and the second valve seat respectively, and the inner edge of the sealing gasket is tightly connected with the exhaust core and the first valve seat respectively.

The invention also provides a precision combination valve, and the intermediate valve in the precision combination valve is the air pressure regulating valve.

The invention also provides a gas allowance detection device of the precise combination valve, which comprises a water tank, a floating plate and the precise combination valve as claimed in claim 9;

the water tank is provided with a transparent part, and the transparent part is provided with scales;

the precise combination valve is fixed on the floating plate;

when the precise combination valve operates, the current gas quantity of the precise combination valve is determined according to the floating plate and the scales.

Has the advantages that: compared with the prior art, the invention provides the air pressure regulating valve, the precision combination valve and the precision combination valve gas surplus detection device. The opening and closing of the air outlet channel are adjusted through the adjusting assembly and the movable assembly. When exhausting, both valve cores can exhaust, so that the air pressure range, namely the adjusting range, which can be adjusted by the air pressure adjusting valve is improved, and the adjusting efficiency is improved.

Drawings

Fig. 1 is a front view of an air pressure regulating valve provided in the present invention.

Fig. 2 is a sectional view of the air pressure regulating valve provided by the present invention in a front view.

Fig. 3 is a right side view of the air pressure regulating valve provided in the present invention.

Fig. 4 is a right-side sectional view of the air pressure regulating valve according to the present invention.

Fig. 5 is an exploded view of the regulator member, the second valve seat and the fitting of the second valve seat chamber of the pneumatic regulator valve provided in the present invention.

Fig. 6 is an exploded view of the first valve seat, the lower valve seat and the chamber internal fittings of the first valve seat and the lower valve seat of the air pressure regulating valve provided by the invention.

Fig. 7 is a schematic connection diagram of the middle pull rod, the first valve core, the second valve core, the first spring and the second spring in the air pressure regulating valve provided by the invention.

Fig. 8 is a schematic structural view of the air pressure regulating valve provided by the present invention between the air bleeding valve core and the upper gland and between the air bleeding valve core and the upper air cavity.

Fig. 9 is an exploded view of an exhaust valve element in the air pressure regulating valve provided by the present invention.

Fig. 10 is an exploded view of the middle pull rod of the air bleed valve core in the air pressure regulating valve provided by the present invention.

FIG. 11 is a schematic view of a precision combination valve provided by the present invention.

Fig. 12 is a schematic view of a gas remaining amount detection device of a precision combination valve according to the present invention.

The meanings marked in the figures:

110, an adjusting cap; 120, a second valve seat; 130, a first valve seat; 121, an upper gland; 122, an upper air cavity; 131, an intermediate valve cavity; 132, intermediate valve upper cover; 200, a lower valve seat; 300, a lower baffle plate; 410, adjusting bolts; 420, spring loading; 430, a lifting nut; 440, an exhaust valve spool; 441, an exhaust top cap; 442, an exhaust steel ball; 443, an exhaust core; 444, a sealing gasket; 445, an exhaust hole; 446, a through hole; 450, a middle pull rod; 460, a lower spring; 470, adjusting the piston; 451, a first fixing member; 451, a first fixing member; 452, a second mount; 453, a movable pull rod; 510, a first spool; 520, a second spool; 530, S1, a first seal; s2, a second seal; s3, a third seal; s4, a first sealing sheet; s5, a second sealing sheet; s6, a piston seal; s7, a fourth seal; 600, a gas saving thimble; 1, a central valve; 2, a main gas source; 3, balancing the air cylinder; 4, automatic cylinder control valve; 5, a load balance adjusting device; 6, an air source outlet pipeline; 7, a pressure gauge; 8, a silencer; 9, a water tank; 10, floating the board; 11, water; 12, a transparent part; 13, graduation; a, a first air outlet channel; b, an air inlet channel; c, a second air outlet channel; d, balancing a channel; e, a first connecting channel; f, a second connecting channel; g, a pressure measuring channel; h, connecting gas channels.

Detailed Description

The present invention provides an air pressure regulating valve, which is described in further detail below with reference to the accompanying drawings and examples, in order to make the objects, technical solutions and effects of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention will be further explained by the description of the embodiments with reference to the drawings.

As shown in fig. 1 to 4, the present embodiment provides an air pressure adjusting valve, which may include an upper valve seat, a lower valve seat 200, and a lower baffle 300, wherein the upper valve seat is connected to the lower valve seat 200 in an inserting manner, and the lower baffle 300 abuts against the lower valve seat 200. The inner cavity of the upper valve seat and the inner cavity of the lower valve seat 200 are provided with a first valve core in a matching way, and the lower valve and the lower baffle 300 are provided with a second valve core in an up-down matching way. The upper and lower seats 200 cooperate to form a first active area in which the first valve element is movable up and down. The lower block baffle 300 cooperates with the lower valve seat 200 to form a second movable region in which the second valve element can move up and down. A first spring is arranged between the first valve core and the inner cavity of the upper valve seat, one end of the first spring is matched with the upper valve seat, and the other end of the first spring is sleeved in the inner cavity of the first valve core. A second spring is also arranged between the second valve core and the lower baffle 300, one end of the second spring is matched with the lower baffle 300, and the other end of the second spring is sleeved in the inner cavity of the second valve core.

An air inlet channel B and an air outlet channel are respectively formed in the side edge of the lower valve seat 200, wherein the air outlet channel comprises a first air outlet channel a and a second air outlet channel C. The air inlet channel is separated from the first air outlet channel A through the first valve core, and the air inlet channel is separated from the second air outlet channel C through the second valve core. The relative positions of the inlet channel, the first outlet channel and the second outlet channel can be freely adjusted, for example, the first outlet channel is positioned on the left side of the side surface where the inlet channel is positioned. In the present embodiment, as shown in fig. 1 to 4, in the present embodiment, the second air outlet channel is located opposite to the air inlet channel, and the first air outlet channel is located on the left side of the side where the air inlet channel is located.

Further, in order to increase the flow rate of the gas, in the present embodiment, the intake passage includes an intake throttle opening and an intake passage opening, wherein the intake throttle opening has an inner diameter smaller than that of the intake passage opening; the air outlet channel comprises an air outlet throttling port and an air outlet channel port, wherein the inner diameter of the air outlet throttling port is smaller than that of the air outlet channel port. Thereby reducing the size of the pneumatic control valve and making it more portable and easier to operate.

The pneumatic control valve also comprises a regulating piece, and the regulating piece is used for regulating the gas in the inner cavity of the pneumatic control valve and sealing the pneumatic control valve. The adjusting piece is abutted against the pull rod assembly and adjusts the relative position of the pull rod assembly. The adjusting piece adjusts the pressure borne by the first valve core and the second valve core through the pull rod assembly.

Further, the conventional adjusting member is in the shape of a handle, and a stem of the handle is exposed outside the pneumatic adjusting valve, so that the adjusting member is easily corroded, particularly, a joint of the stem and the upper valve seat is corroded, and if the adjusting member is set to a pressure value for a long time, the adjusting member is difficult to adjust subsequently. And the material of handle is generally metal, if be stained with liquid in the operation on hand, skid easily, be difficult to control.

Therefore, in the present embodiment, the adjusting member is a cap-like structure, and the present embodiment is referred to as an adjusting cap 110. The outer wall of the upper valve seat is provided with a first convex pattern, and the inner wall of the adjusting cap 110 is provided with a buckle matched with the first convex pattern; the cross section of the pull rod assembly connected with the adjusting cap 110 is polygonal, a polygonal groove matched with the polygon is formed in the inner bottom surface of the adjusting cap 110, and the adjusting cap 110 is matched and connected with the pull rod assembly through the end surface and the polygonal groove. The polygonal groove in this embodiment is a rectangular groove.

The working principle of the embodiment is as follows:

the adjusting piece adjusts the relative position of the pull rod assembly in the inner cavity of the pneumatic adjusting valve, so that the pressure applied to the first valve core and the second valve core is adjusted, and the pressure is the threshold pressure.

The main gas source is connected with the gas inlet channel and inputs gas to the main gas source. When the input pressure on the side of the air inlet channel A rises to exceed the threshold pressure, the air inlet channel is pressed upwards and downwards, the first valve core and the second valve core press the spring and push the spring to the opposite direction based on the pressure of the air flow, so that the first air outlet channel and the second air outlet channel are opened, the air can flow out of the first air outlet channel and the second air outlet channel, and the pressure of the air inlet channel is reduced. Compared with one air outlet channel of the traditional pneumatic regulating valve, the two air outlet channels are arranged in the pneumatic regulating valve, so that the effective cross-sectional area of the air outlet can be larger under the condition of limited volume of the pneumatic regulating valve, the response speed of air exhaust is higher, and the air exhaust flow is larger. Through tests, the pneumatic regulating valve of the embodiment can improve the exhaust flow of 500L/min n.

Furthermore, the first valve core and the second valve core are sleeved on the same pull rod assembly, and the first spring and the second spring surround the pull rod assembly, so that the valve core pull rod controls the first valve core and the second valve core to move on the same vertical plane, and the function of fixing the first valve core and the second valve core is achieved.

Further, the pressure regulation of the regulating part is low in fineness, and accurate pressure regulation is difficult to realize. Therefore, in this embodiment, on the basis of the above-mentioned upper valve seat, the upper valve seat includes the first valve seat 130 and the second valve seat 120, the first valve seat 130 is connected with the lower valve seat 200 in an inserting manner, and the second valve seat 120 is fixedly connected with the first valve seat 130.

The first valve seat 130 includes an intermediate chamber and an intermediate valve upper cover 132, and a region where the intermediate valve upper cover 132 is connected to the second valve seat 120 is provided with a first connection passage. The pull rod assembly includes a center pull rod 450, an upper spring 420, an exhaust valve spool 440, an adjustment assembly, a lower spring 460, and an adjustment piston 470. The middle pull rod 450 sequentially passes through the second spring, the second valve core, the first valve core and the first spring from bottom to top until being fixedly connected with the adjusting piston 470 in the cavity of the first valve seat 130.

The second valve seat 120 includes an upper cover 121 and an upper air chamber 122, and an outer side of the upper cover 121 is provided with a relief, by which the adjusting member is snap-coupled to the upper cover 121. An opening is formed in one surface, which is contacted with the top of the adjusting part, of the upper gland 121, one end of the adjusting component is in interference fit with the opening and is abutted against the inside of the top of the adjusting part, and the other end of the adjusting component is sleeved in the ring of the upper spring 420 and is abutted against the upper surface of the upper spring 420. Thus, when the adjustment member is tightened, the adjustment assembly moves downward under the action of the adjustment member, thereby compressing the upper spring 420.

When the user uses the adjusting piece, the upper spring 420 is extruded once the user screws the adjusting piece, so that no adjustment space exists, and the user can not obviously distinguish whether the adjustment is started or not when the user starts to screw the adjusting piece. Thus, in this embodiment, as shown in FIG. 5, the adjustment assembly includes two parts, an adjustment bolt 410 and a lift nut 430. One end of the adjusting bolt 410 is in interference fit with the opening of the upper gland 121 and abuts against the inside of the top of the adjusting member, and the other end of the adjusting bolt 410 passes through the lifting nut 430. The lifting nut 430 is sleeved on the upper spring 420, and one end of the lifting nut 430 abuts against the upper surface of the upper spring 420. The outer side of the adjusting bolt 410 is provided with a protrusion, and when the adjusting bolt 410 moves, the protrusion moves on the inner wall of the upper gland 121 and the upper surface of the lifting nut 430 to adjust the tightness of the upper spring 420. That is, when the adjusting member is not tightened, the protrusion abuts against the inner wall of the upper cover 121, the upper spring 420 is pressed to a certain extent by the pressure of the lifting nut 430, and the tightness of the adjusting member does not affect the tightness of the upper spring 420. When the adjusting member is gradually tightened, the adjusting bolt 410 moves, the protrusion gradually approaches the lifting nut 430, and the upper spring 420 is further pressed based on the contact surface of the lifting nut 430 and the upper spring 420, so that the pressure of the upper spring 420 can be adjusted by the adjusting member. Therefore, the adjusting piece does not have the adjusting function in the distance from the inner wall of the upper gland 121 to the upper surface of the adjusting nut, so that the adjusting spare time is provided for a user to adjust, and the adjusting nut can be adjusted more conveniently.

The upper air cavity 122 is fixedly connected with the middle valve cover, and a second connecting channel is arranged in a region of the upper air cavity 122 opposite to the first connecting channel, and the second connecting channel is communicated with the inner cavities of the first connecting channel and the second valve seat 120. One end of the upper spring 420 is sleeved with an adjusting assembly, the other end of the upper spring is sleeved with the exhaust valve core 440, one section of the exhaust valve core 440 is sleeved in the ring of the upper spring 420, and the other end of the exhaust valve core is abutted against the upper spring 420 for connection. The upper air chamber 122 is fixedly connected to the upper cover 121 to form an upper air chamber, and the air discharge valve core 440 is located in the upper air chamber and can move up and down based on the upper spring 420 and the air flow from the second connection passage. In contrast, a lower spring 460 and an adjusting piston 470 are disposed in the cavity of the first valve seat 130, one end of the adjusting piston 470 and one end of the lower spring 460 are sleeved, and the other end of the lower spring 460 is fixedly connected to the inner surface of the first valve seat 130. The adjusting piston 470, the lower spring 460 and the intermediate pull rod 450 divide the inner cavity of the first valve seat 130 into two parts, and the two parts are communicated with the second valve seat 120 through the first connecting passage. In order to increase the separation between the upper and lower pressures of the regulating piston 470, the outer wall of the regulating piston 470 is provided with a sealing groove, and a piston seal S6 is disposed in the sealing groove, and the piston seal S6 is in interference connection with the middle valve seat to realize the gas sealing between the upper and lower sides of the regulating piston 470.

The gas inlet passage of the lower valve seat 200 is provided with a first regulation passage, and the second valve seat 120 is provided with a second regulation passage, and gas of the gas inlet passage can enter the inner cavity of the first valve seat 130 based on the first regulation passage and the second regulation passage. Therefore, another portion of the first valve seat 130 is connected to the intake passage through the first regulation passage and the second regulation passage.

One side of the upper gland 121 is provided with a balance passage for connecting with a load balance adjusting device, which inputs gas through the balance passage. Therefore, the pressure applied to the side of the exhaust valve core 440 connected to the upper spring 420 includes the regulated pressure of the regulating member and also includes the gas load pressure caused by the gas input from the load balancing regulating device. In the embodiment, the gas load pressure and the adjusting pressure are both used as the preset pressure, and a user can set the preset pressure through the adjusting piece and the liability balancing device.

As shown in fig. 5, 8 and 9, the exhaust valve core 440 includes an exhaust top cap 441, an exhaust steel ball 442, and an exhaust core 443. The exhaust core 443 is a tubular structure, one end of the exhaust core 443 is in interference fit with the second connecting channel, and the other end of the exhaust core 443 carries the exhaust ball 442. The bearing mode in this embodiment is that the other end of the exhaust core 443 is provided with a slot, and the slot is used for fixing the exhaust steel ball 442. And the exhaust top cap 441 covers the exhaust core 443. The exhaust core 443 is provided with a plurality of through holes 446 at the outer side of the section protruding out of the second connection passage, so that the exhaust ball 442 blocks the through holes 446 from the second connection passage. The edge of the exhaust top cap 441 is provided with a plurality of exhaust holes 445, and the exhaust holes 445 communicate the region where the exhaust core 443 is located with the region formed between the exhaust top cap 441 and the upper cover 121. In addition, the upper gland 121 and the upper air cavity 122 are matched to form a top cap active region, the exhaust top cap 441 can move up and down in the top cap active region, and when the exhaust top cap 441 contacts with the surface of the upper gland 121, the exhaust top cap 441 separates the cavity of the upper gland 121 from the top cap active region.

When a user sets the gas load pressure using the load balancing device and the adjustment member, the load balancing device directs gas into the cavity of the upper gland 121. The exhaust top cap 441 in the top cap active area is moved downward by the regulating member and the gas load pressure to expose the exhaust hole 445 of its surface edge, and the load balancing device is thereby entered into the exhaust hole 445 and is brought into contact with the exhaust core 443 through the exhaust hole 445. The load balancing device continues to introduce gas and depresses the exhaust top cap 441. When the air pressure is maximum, the exhaust top cap 441 is abutted against the surface of the upper air cavity 122. Since the exhaust top cap 441 is in contact with the surface of the upper air cavity 122 several times during the exhaust process, a sealing gasket 444 is disposed between the exhaust top cap 441 and the upper air cavity 122 to reduce the loss of the product and improve the sealing performance. The outer edge of the sealing gasket 444 is tightly connected to the upper air cavity 122 and the second valve seat 120, respectively, and the inner edge of the sealing gasket 444 is tightly connected to the exhaust core 443 and the first valve seat 130, respectively. That is, there is a certain distance between the sealing gasket 444 and the upper air cavity 122, so as to play a role of buffering and prolong the service life of the device.

Further, the first connection channel communicates with a pressure measurement channel for connection with a pressure measurement device for measuring the air pressure above the regulating piston 470.

Further, a gas-saving thimble 600 is further disposed in the upper air cavity 122, and the gas-saving thimble 600 penetrates through the upper air cavity 122.

Further, the lower valve seat 200 is opened with an air connecting channel, wherein the air connecting channel penetrates through the air inlet channel. Two ends of the gas connecting channel can be respectively connected with a gas source gas outlet pipeline, an automatic cylinder control valve or other devices needing gas input.

Further, in order to increase the sealing performance of the pneumatic regulating valve, a plurality of sealing elements are arranged in the pneumatic regulating valve. The lower baffle 300 and the lower valve seat 200 are provided with a first groove on the matching surface, the second valve core and the lower baffle 300 are provided with a second groove on the matching surface, the second valve core and the first valve seat 130 are provided with a third groove on the matching surface, the first sealing element S1 is in interference fit with the first groove, the second sealing element S2 is in interference fit with the second groove, and the third sealing element S3 is in interference fit with the third groove. Further, a fourth seal S7 is provided on the abutting surface of the lower flapper 300 and the lower valve seat 200, so that the lower flapper 300 seals with the lower valve seat 200. Specifically, as shown in fig. 2, 4 and 6, O-rings are preferably used for the first seal S1, the second seal S2 and the third seal S3. Through the interference fit of the sealing piece and the groove, the sealing performance of the pneumatic adjusting valve is better. A first sealing sheet S4 is inserted into the contact surface between the lower valve seat 200 and the upper valve seat, and a second sealing sheet S5 is provided between the intermediate valve upper cover 132 and the intermediate valve chamber 131.

Further, as shown in fig. 6, 7 and 10, in order to facilitate assembly of the first valve spool and the first spring with the intermediate lever 450, the intermediate lever 450 includes a movable lever 453, a first mount 451, and a second mount 452. Wherein, the middle region of the movable pull rod 453 is provided with a projection for abutting against the second valve core and the first valve core, and the projection of the movable pull rod 453 is a shaft-shaped projection in the embodiment. The shaft-shaped bulges are provided with two plane areas, so that the shaft-shaped bulges are convenient to take and place during assembly. The second fixing part 452 and the first fixing part 451 are sleeved with one end of the movable pull rod 453 located in the middle cavity.

In assembling, the lower flapper 300 and the lower valve seat 200 are assembled, and then the second valve core and the second spring are disposed on the lower flapper 300. Then, the movable rod 453 is passed through the second spool and the second spring, and the relative positions of the second spool and the first spool are fixed by the squealer bump, and then the middle valve seat is combined with the lower valve seat 200, and the lower spring 460 is disposed through the movable rod 453 on the middle valve seat. An adjusting piston 470 is sleeved above the lower spring 460. Finally, the first fixing member 451 and the second fixing member 452 are fitted at a position spaced apart from the top surface of the adjusting piston 470. The distance between the first and second securing members 451, 452 and the adjusting piston 470 may be adjusted according to the supported pressure threshold to achieve movement of the adjusting piston 470 between the first securing member 451 and the intermediate bottom surface of the intermediate valve seat.

Further, the air pressure regulating valve in the present embodiment is provided with a plurality of air flow outlets, which can achieve the effect of a combination valve. Compared with the existing combination valve, the air pressure regulating valve can replace a plurality of air pressure regulating valves in the combination valve, so that the simplification of the combination valve is realized. Based on the air pressure regulating valve, the present embodiment further provides a precision combination valve, in which the air pressure regulating valve is used as the center valve 1. Taking the combination valve shown in fig. 11 as an example, the main air source 2 is connected with an air inlet channel pipeline, the balance cylinder 3 is connected with a first air outlet channel pipeline, and the automatic cylinder control valve 4 and the air source outlet pipeline 6 are respectively connected with two ends of an air connecting channel. And the load balancing device 5 is connected with the balancing passage through a pipeline. The muffler 8 is connected to the second outlet passage. The pressure gauge 7 is connected with the pressure measuring channel to realize pressure measurement.

Further, in order to improve the accuracy, the precision combination valve of the embodiment adopts precision machining, such as CNC machining and numerical control turn-milling machining, to replace the original cast parts.

After improvement, the sensitivity of the precision combination valve is improved from the original 0.5% to 0.2%.

Further, in order to realize monitoring of the amount of the gas in the precision combination valve, the present embodiment provides a gas remaining amount detection device of the precision combination valve based on the precision combination valve. The detection device comprises a water tank 9, a floating plate 10 and the precise combination valve. As shown in fig. 12, the water tank 9 is a transparent water tank 9, and the outer wall of the water tank 9 is provided with a scale 13. The water tank 9 is provided with a transparent part 12, and the transparent part 12 is provided with a scale 13. The scale 13 corresponds to the amount of gas in the precision combination valve. The user can see through the transparent portion 12 where the float plate 10 is located in the water tank 9.

The precision combination valve is fixed on the floating plate 10, and the floating plate 10 can sink into the water 11 in the water tank 9 under the gravity action of the precision combination valve and the gas of the combination valve. When the precision combination valve is operated, the weight force borne by the floating plate 10 is smaller and smaller as the amount of gas in the precision combination valve is smaller and smaller, so that the floating plate 10 moves upwards as the precision combination valve is used. During the upward movement, according to the height of the floating plate 10 in the water tank 9, namely the floating plate 10 and the scale 13, the current gas quantity of the precise combination valve can be determined. On one hand, the scale 13 can directly write the gas amount corresponding to different heights, or the scale 13 can only indicate 11 water positions, and on the basis of the obtained 11 water positions, the residual amount of the gas in the precise combination valve is calculated according to the original parameters of the mass, the gas density and the like of the precise combination valve. The floating plate can be made of foam and other materials which can float on the water surface.