Pneumatic control proportioning valve

Abstract

The invention relates to the technical field of pressure regulating valves, in particular to a pneumatic control proportional regulating valve which mainly solves the technical problem that an existing pressure regulating valve is small in pressure regulating range. The regulating valve comprises a valve shell, a valve cover and a valve element, a mounting opening is formed in one end of the valve shell, an overflow opening is formed in the other end of the valve shell, and two connecting openings are formed in the side wall of the valve shell; the valve cover is hermetically fixed at the mounting port and is provided with a control gas inlet; the valve element is arranged in an inner cavity of the valve shell and is in a stepped shaft shape, the large-diameter shaft section is close to the valve deck, and the small-diameter shaft section is far away from the valve deck. According to the regulating valve, the existing spring is replaced by the control gas, the output pressure of the working fluid can be regulated by regulating the pressure intensity of the control gas, the regulating range is larger, the regulation is more stable, the control precision is higher, and the regulating valve is particularly suitable for a hydraulic system with a larger pressure regulating range and a higher precision requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure regulating valves, and in particular to a gas-controlled proportional regulating valve. Background Art

[0002] In the hydraulic system, the system pressure needs to be adjusted by a pressure regulating valve.

[0003] Currently, common pressure regulating valves include direct-acting and pilot-operated types. Both valves achieve pressure regulation by adjusting the balance between spring force and the hydraulic pressure at the valve inlet. However, due to the limited pressure regulation range of the spring, only a narrow pressure regulation range can be achieved without changing the spring, making it difficult to apply to hydraulic systems with a wide pressure regulation range. Summary of the Invention

[0004] In order to overcome the technical defect of the existing pressure regulating valve in that the pressure regulating range is relatively small, the present invention provides an air-controlled proportional regulating valve.

[0005] The air-controlled proportional regulating valve provided by the present invention comprises: The valve housing is a cylindrical structure with a mounting port formed at one end and an overflow port formed at the other end. The side wall of the valve housing is provided with two coaxially arranged connecting ports, the axes of the connecting ports intersecting and perpendicular to the axis of the cylindrical structure; a valve cover, which is sealed and fixed to the mounting port and is provided with a control air inlet communicating with the inner cavity of the valve housing; The valve core is placed in the inner cavity of the valve housing. The valve core is in the shape of a stepped shaft, and the large-diameter shaft section is close to the valve cover, and the small-diameter shaft section is away from the valve cover. The large-diameter shaft section is slidably sealed on the inner wall of the valve housing and forms a control air cavity between the large-diameter shaft section and the valve cover. The free end of the small-diameter shaft section is set to be conical and used to insert into the overflow port. The stepped surface formed by the large-diameter shaft section and the small-diameter shaft section serves as a pressure surface and is located on the same side of the connecting port as the valve cover.

[0006] Optionally, both connecting ports are fixed with connecting pipes, and the connecting pipes are coaxially arranged with the connecting ports.

[0007] Optionally, the connecting pipe is provided with a connecting flange, and the connecting flange has a plurality of connecting holes evenly distributed along the circumference. The connecting pipe is also sleeved with a first sealing ring, and the first sealing ring is located on a side of the connecting flange away from the connecting port.

[0008] Optionally, the valve cover is provided with a second sealing ring, and when the valve cover is fixed to the mounting port, the second sealing ring abuts against the inner wall of the mounting port to achieve sealing between the valve cover and the mounting port.

[0009] Optionally, the inner wall of the mounting port is provided with an annular groove, the annular groove is coaxial with the mounting port, and the annular groove has a plurality of avoidance notches evenly distributed along the circumference and extending to the end face of the mounting port, a plurality of blocks are protruding from the side wall of the valve cover corresponding to the avoidance notches, and when the valve cover is fixed to the mounting port, the blocks are located on the side of the second sealing ring close to the end face of the mounting port, the valve housing is provided with a pressure block for pressing the valve cover, and the pressure block has a working state of pressing the valve cover and an avoidance state of detaching from the valve cover to avoid disassembly of the valve cover.

[0010] Optionally, the large-diameter shaft section is sleeved with a third sealing ring, and the third sealing ring abuts against the inner wall of the valve housing to achieve sealing between the large-diameter shaft section and the valve housing.

[0011] Optionally, the valve core further includes an extended shaft segment, which is located on a side of the large-diameter shaft segment away from the small-diameter shaft segment, and a diameter of the extended shaft segment is larger than a diameter of the large-diameter shaft segment.

[0012] Optionally, the extended shaft section is sleeved with a fourth sealing ring, and the fourth sealing ring abuts the inner wall of the valve housing to achieve sealing between the extended shaft section and the valve housing. A connecting hole is opened on the valve housing, and one end of the connecting hole is connected to the closed area surrounded by the valve core, valve housing, the third sealing ring and the fourth sealing ring, and the other end is connected to the outside world.

[0013] Optionally, a pipe joint is further provided on the side wall of the valve housing, and the pipe joint is connected to the area between the two connecting ports.

[0014] Optionally, a mounting seat is further provided on the side wall of the valve housing, and the mounting seat is used to achieve installation and fixation of the valve housing.

[0015] The technical solution provided by the present invention has the following advantages compared with the prior art: The pneumatic proportional control valve provided by the present invention has control gas and working fluid acting on both sides of the valve core respectively. When the product of the control gas pressure and the corresponding pressure surface of the valve core is greater than the product of the output working fluid pressure and the corresponding pressure surface of the valve core, the valve core is inserted into the overflow port. At this time, the control valve is in a closed state, and the pressure of the output working fluid is equal to the pressure of the input working fluid. Since the two pressure surfaces of the valve core are also fixed in area after the structure is determined, the valve core can be moved away from the overflow port by reducing the pressure of the control gas, thereby gradually increasing the gap between the valve core and the overflow port, and then gradually reducing the pressure of the output working fluid until the valve core is balanced again, thereby achieving the regulation of the output working fluid pressure, that is, the regulation of the output pressure. This control valve uses control gas instead of the existing spring. The output pressure of the working fluid can be regulated by regulating the pressure of the control gas. The regulation range is larger, the regulation is more stable, and the control accuracy is higher. It is particularly suitable for hydraulic systems with a large pressure regulation range and high precision requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic cross-sectional view of a pneumatic proportional control valve according to an embodiment of the present invention is shown; Figure 2 A top view of a pneumatic proportional control valve according to an embodiment of the present invention is shown; Figure 3 A schematic diagram showing the cross-sectional structure of a valve housing according to an embodiment of the present invention; Figure 4 It shows a front view of the valve housing in an embodiment of the present invention; Figure 5 express Figure 4 Cross-sectional view at AA in the middle; Figure 6 A left side view of the valve housing according to an embodiment of the present invention is shown; Figure 7 A top view of a valve housing according to an embodiment of the present invention is shown; Figure 8 A schematic diagram showing the cross-sectional structure of a valve cover according to an embodiment of the present invention; Figure 9 A schematic diagram of the cross-sectional structure of the valve core in an embodiment of the present invention is shown.

[0019] In the picture: 100, valve housing; 110, mounting port; 120, overflow port; 130, connection port; 140, connecting pipe; 141, connecting flange; 142, connecting hole; 143, first sealing ring; 150, annular groove; 151, avoidance notch; 160, pressure block; 170, communicating hole; 180, pipe joint; 190, mounting seat; 200, valve cover; 210, control air inlet; 220, second sealing ring; 230, clamping block; 240, positioning groove; 300, valve core; 310, large-diameter shaft section; 320, small-diameter shaft section; 330, control air cavity; 340, third sealing ring; 350, extended shaft section; 360, fourth sealing ring. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0021] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms based on specific circumstances.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] The following combination Figures 1 to 9 Specific embodiments of the present invention are described in detail.

[0024] This embodiment provides a pneumatic proportional control valve, including a valve housing 100 , a valve cover 200 and a valve core 300 .

[0025] The valve housing 100 is a cylindrical structure with an installation port 110 formed at one end and an overflow port 120 formed at the other end. Two coaxially arranged connecting ports 130 are provided on the side wall of the valve housing 100. The axis of the connecting port 130 intersects and is perpendicular to the axis of the cylindrical structure.

[0026] Specifically, both connection ports 130 are secured with connecting pipes 140, which are coaxially arranged with the connection ports 130. The securing structure of the connecting pipes 140 and the connection ports 130 is not limited, and may be welded or screwed. Regardless of the structure, the connection between the connecting pipes 140 and the connection ports 130 must be sealed to prevent leakage. During use, one connecting pipe 140 serves as an inlet pipe connected to the system piping, while the other serves as an outlet pipe connected to the system piping.

[0027] More specifically, connecting pipe 140 is provided with a connecting flange 141 having a plurality of connecting holes 142 evenly distributed along its circumference. A first sealing ring 143 is also sleeved on connecting pipe 140, located on the side of connecting flange 141 away from connecting port 130. Connecting pipe 140 is connected to the system pipeline via connecting flange 141, and a seal is achieved between connecting pipe 140 and the system pipeline via first sealing ring 143. Of course, the connection structure between connecting pipe 140 and the system pipeline is not limited to this. For example, the end of connecting pipe 140 may also be provided with threads, so that connecting pipe 140 and the system pipeline are screwed together.

[0028] In detail, a positioning groove for clamping the first sealing ring 143 is provided on the connecting pipe 140 to prevent the first sealing ring 143 from axial displacement.

[0029] It should be noted that existing pressure regulating valves are generally installed in the bypass and are not suitable for the needs of the main line. This embodiment uses the design of structures such as the connecting pipe 140, the connecting flange 141 and the first sealing ring 143 to enable the regulating valve to be directly installed on the system main line.

[0030] Furthermore, a mounting seat 190 is provided on the side wall of the valve housing 100 , and the mounting seat 190 is used to achieve installation and fixation of the valve housing 100 .

[0031] Specifically, four mounting seats 190 are provided, and the mounting seats 190 are designed as threaded seats. When in use, the regulating valve of this embodiment can be fixed to an external structure using fasteners such as screws. Of course, the number and structure of the mounting seats 190 are not limited to this. For example, two mounting seats 190 can be provided, and the mounting seats 190 are designed as snap-fit ​​structures, which can be snap-fitted to the external structure when in use.

[0032] The valve cover 200 is sealed and fixed to the mounting opening 110 and is provided with a control air inlet 210 communicating with the inner cavity of the valve housing 100 .

[0033] Specifically, the control air inlet 210 is an independent structure welded to the valve cover 200. A through hole is provided in the valve cover 200 to connect the control air inlet 210 with the inner cavity of the valve housing 100. During use, the control air inlet 210 is connected to an external air supply pipe. Of course, the form of the control air inlet 210 is not limited to this. For example, a hole can be directly opened in the valve cover 200 to serve as the control air inlet 210, and an external air supply pipe can be directly inserted into the hole during use.

[0034] Specifically, the valve cover 200 is sleeved with a second sealing ring 220 , and when the valve cover 200 is fixed to the mounting opening 110 , the second sealing ring 220 abuts against the inner wall of the mounting opening 110 to achieve sealing between the valve cover 200 and the mounting opening 110 .

[0035] More specifically, a positioning groove for clamping the second sealing ring 220 is provided on the valve cover 200 to prevent the second sealing ring 220 from axial displacement.

[0036] Specifically, the inner wall of the mounting port 110 is provided with an annular groove 150, the annular groove 150 is coaxial with the mounting port 110, and the annular groove 150 is evenly distributed along the circumference with a plurality of avoidance notches 151 extending to the end face of the mounting port 110, and a plurality of blocks 230 are protruding from the side wall of the valve cover 200 corresponding to the avoidance notches 151, and when the valve cover 200 is fixed to the mounting port 110, the blocks 230 are located on the side of the second sealing ring 220 close to the end face of the mounting port 110, and the valve housing 100 is provided with a pressing block 160 for pressing the valve cover 200, and the pressing block 160 has a working state of pressing the valve cover 200 and an avoidance state of being separated from the valve cover 200 to avoid disassembly of the valve cover 200. During installation, first place the clamping block 230 corresponding to the avoidance notch 151, then push the valve cover 200 axially into the valve housing 100 so that the clamping block 230 contacts the bottom of the annular clamping groove 150. Then, rotate the valve cover 200 circumferentially so that the clamping block 230 engages the area adjacent to the avoidance notch 151, and finally, tighten the valve cover 200 using the pressing block 160. This structure is easy to assemble and disassemble, and is more conducive to the replacement of the valve cover 200 and the valve core 300. Of course, the connection structure between the valve cover 200 and the installation port 110 is not limited to this. For example, the valve cover 200 can also be screwed into the installation port 110 and sealed by the second sealing ring 220.

[0037] More specifically, the pressing block 160 can be detachably fixed to the valve housing 100 by means of screws, buckles, magnetism, or the like.

[0038] More specifically, in order to improve the positioning effect of the pressure block 160 on the valve cover 200, this embodiment provides a positioning groove 240 adapted to the pressure block 160 on the end face of the valve cover 200. The pressure block 160 is placed in the positioning groove 240, which can not only axially press the valve cover 200, but also limit the circumferential rotation of the valve cover 200.

[0039] Among them, the valve core 300 is placed in the inner cavity of the valve housing 100, the valve core 300 is in the shape of a stepped shaft, and the large diameter shaft section 310 is close to the valve cover 200, and the small diameter shaft section 320 is away from the valve cover 200. The large diameter shaft section 310 is slidably sealed on the inner wall of the valve housing 100 and forms a control air cavity 330 between the valve cover 200. The free end of the small diameter shaft section 320 is set to be conical and used to insert into the overflow port 120. The stepped surface formed by the large diameter shaft section 310 and the small diameter shaft section 320 serves as a pressure surface and is located on the same side of the connecting port 130 as the valve cover 200.

[0040] Specifically, the large-diameter shaft section 310 is sleeved with a third sealing ring 340 , and the third sealing ring 340 abuts against the inner wall of the valve housing 100 to achieve sealing between the large-diameter shaft section 310 and the valve housing 100 .

[0041] More specifically, a positioning groove for clamping the third sealing ring 340 is provided on the large-diameter shaft section 310 to prevent the third sealing ring 340 from axial displacement.

[0042] Furthermore, the valve core 300 includes an extended shaft section 350, which is located on the side of the large-diameter shaft section 310 away from the small-diameter shaft section 320. The extended shaft section 350 has a larger diameter than the large-diameter shaft section 310. Because the area of ​​the end surface of the valve cover 200 corresponding to the control air cavity 330 directly determines the required control air pressure range, and the larger this area, the lower the required control air pressure, the valve core 300 of this embodiment is provided with the extended shaft section 350 to increase this area, thereby reducing the required control air pressure.

[0043] Specifically, the extended shaft section 350 is sleeved with a fourth sealing ring 360, which abuts the inner wall of the valve housing 100 to achieve a seal between the extended shaft section 350 and the valve housing 100. The valve housing 100 is provided with a connecting hole 170. One end of the connecting hole 170 connects to the enclosed area surrounded by the valve core 300, the valve housing 100, the third sealing ring 340, and the fourth sealing ring 360, while the other end of the connecting hole 170 is connected to the outside world. The fourth sealing ring 360 cooperates with the third sealing ring 340 to achieve a double seal between the valve core 300 and the valve housing 100, achieving a more effective sealing effect. The fourth sealing ring 360 also prevents control air from entering the gap between the valve core 300 and the valve housing 100, thereby ensuring valve control accuracy.

[0044] It should be noted that the connection hole 142 is a process hole and has two functions: first, it can facilitate the installation of the fourth sealing ring 360; second, it can also prevent the gas pressure in the aforementioned closed area from being too high, which affects the control accuracy of the valve.

[0045] More specifically, a positioning groove for clamping the fourth sealing ring 360 is provided on the extension shaft section 350 to prevent the fourth sealing ring 360 from axial displacement.

[0046] It's easy to understand that the area between the two connection ports 130 forms the control fluid chamber, where the fluid pressure equals the pressure of the output working fluid. When the valve core 300 is stable, the product of the control air pressure and the corresponding pressure-bearing surface of the valve core 300 equals the product of the output working fluid pressure and the corresponding pressure-bearing surface of the valve core 300.

[0047] Specifically, a pipe joint 180 is further provided on the side wall of the valve housing 100, and the pipe joint 180 is communicated with the area between the two connection ports 130. A pressure sensor or a pressure gauge can be connected to the pipe joint 180 to measure the fluid pressure.

[0048] The working principle of the air-controlled proportional control valve in this embodiment is as follows: During installation, connect the two connecting pipes 140 to the system pipelines and connect the control air inlet 210 to the control air source; When the regulating valve needs to be closed: When the pressure of the control gas is increased so that the product of the control gas pressure and the corresponding pressure surface of the valve core 300 is greater than the product of the working fluid pressure and the corresponding pressure surface of the valve core 300, the valve core 300 is inserted into the overflow port 120. At this time, the regulating valve is in the closed state, and the pressure of the output working fluid is equal to the pressure of the input working fluid. When the regulating valve needs to be opened: The pressure of the control gas is reduced so that the product of the control gas pressure and the corresponding pressure surface of the valve core 300 is less than the product of the working fluid pressure and the corresponding pressure surface of the valve core 300. The valve core 300 moves away from the overflow port 120, thereby gradually increasing the gap between the valve core 300 and the overflow port 120, and further reducing the pressure of the output working fluid until the valve core 300 is balanced again. In this way, the output working fluid pressure is regulated, that is, the output pressure is regulated. The required pressure of the control gas is determined according to the area ratio of the two pressure-bearing surfaces of the valve core 300 in combination with the required output pressure, thereby achieving precise control of the actual output pressure through the control gas.

[0049] It should be noted that the area ratio of the two pressure-bearing surfaces of the valve core 300 is divided into 1:1, 1.2:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1 and the like. Regulating valves with different area ratios can be selected according to the actual control air pressure and fluid pressure range required by the system.

[0050] It should be noted that the systems mentioned above include but are not limited to hydraulic systems.

[0051] The above description is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be included in the scope of protection of the claims.

Claims

1. A pneumatic proportional control valve, characterized in that: include: The valve housing (100) is a cylindrical structure with a mounting port (110) formed at one end and an overflow port (120) formed at the other end. Two coaxially arranged connecting ports (130) are provided on a side wall of the valve housing (100), and the axes of the connecting ports (130) intersect and are perpendicular to the axis of the cylindrical structure. A valve cover (200) is sealed and fixed to the mounting opening (110) and is provided with a control air inlet (210) communicating with the inner cavity of the valve housing (100); A valve core (300) is placed in the inner cavity of the valve housing (100), the valve core (300) is in the shape of a stepped shaft, and the large-diameter shaft section (310) is close to the valve cover (200), and the small-diameter shaft section (320) is away from the valve cover (200), the large-diameter shaft section (310) is slidably sealed on the inner wall of the valve housing (100) and forms a control air cavity (330) between the large-diameter shaft section (310) and the valve cover (200), the free end of the small-diameter shaft section (320) is set to be conical and is used to insert into the overflow port (120), the stepped surface formed by the large-diameter shaft section (310) and the small-diameter shaft section (320) serves as a pressure surface and is located on the same side of the connecting port (130) as the valve cover (200).

2. The pneumatic proportional control valve according to claim 1, characterized in that: The two connecting ports (130) are both fixed with connecting pipes (140), and the connecting pipes (140) are coaxially arranged with the connecting ports (130).

3. The pneumatic proportional control valve according to claim 2, characterized in that: The connecting pipe (140) is provided with a connecting flange (141), and the connecting flange (141) has a plurality of connecting holes (142) evenly distributed along the circumference. The connecting pipe (140) is also sleeved with a first sealing ring (143), and the first sealing ring (143) is located on a side of the connecting flange (141) away from the connecting port (130).

4. The pneumatic proportional control valve according to claim 1, characterized in that: The valve cover (200) is sleeved with a second sealing ring (220), and when the valve cover (200) is fixed to the mounting opening (110), the second sealing ring (220) abuts against the inner wall of the mounting opening (110) to achieve sealing between the valve cover (200) and the mounting opening (110).

5. The pneumatic proportional control valve according to claim 4, characterized in that: The inner wall of the mounting port (110) is provided with an annular groove (150), the annular groove (150) is coaxial with the mounting port (110), and the annular groove (150) is uniformly distributed along the circumference with a plurality of avoidance notches (151) extending to the end face of the mounting port (110), a plurality of clamping blocks (230) are protruding on the side wall of the valve cover (200) corresponding to the avoidance notches (151), and when the valve cover (200) is fixed to the mounting port (110), the clamping blocks (230) are located on a side of the second sealing ring (220) close to the end face of the mounting port (110), the valve housing (100) is provided with a pressing block (160) for pressing the valve cover (200), and the pressing block (160) has a working state of pressing the valve cover (200) and a avoiding state of being separated from the valve cover (200) to avoid disassembly of the valve cover (200).

6. The pneumatic proportional control valve according to claim 1, characterized in that: The large-diameter shaft section (310) is sleeved with a third sealing ring (340), and the third sealing ring (340) abuts against the inner wall of the valve housing (100) to achieve sealing between the large-diameter shaft section (310) and the valve housing (100).

7. The pneumatic proportional control valve according to claim 6, characterized in that: The valve core (300) further comprises an extended shaft section (350), wherein the extended shaft section (350) is located on a side of the large-diameter shaft section (310) away from the small-diameter shaft section (320), and the diameter of the extended shaft section (350) is larger than the diameter of the large-diameter shaft section (310).

8. The pneumatic proportional control valve according to claim 7, characterized in that: The extended shaft section (350) is sleeved with a fourth sealing ring (360), and the fourth sealing ring (360) abuts against the inner wall of the valve housing (100) to achieve sealing between the extended shaft section (350) and the valve housing (100). The valve housing (100) is provided with a connecting hole (170), one end of the connecting hole (170) is connected to a closed area surrounded by the valve core (300), the valve housing (100), the third sealing ring (340) and the fourth sealing ring (360), and the other end is connected to the outside.

9. The air-controlled proportional control valve according to any one of claims 1 to 8, characterized in that: A pipe joint (180) is further provided on the side wall of the valve housing (100), and the pipe joint (180) is in communication with the area between the two connection ports (130).

10. The air-controlled proportional control valve according to any one of claims 1 to 8, characterized in that: A mounting seat (190) is further provided on the side wall of the valve housing (100), and the mounting seat (190) is used to achieve installation and fixation of the valve housing (100).

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