A slow-opening valve

Abstract

The application discloses a slow-opening valve, which comprises a valve body with a valve cavity, an air inlet and an air outlet which are arranged on the valve body and communicate with the valve cavity, a valve rod which is slidably arranged in the valve cavity, a floating piston which is movably arranged above the valve rod, and the valve cavity is divided into a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber by the floating piston and the valve rod, the valve rod has an initial position, a slow-opening position and a working position, when the valve rod is located at the initial position, the third chamber is isolated from the fourth chamber, and the fourth chamber is isolated from the fifth chamber, when the valve rod is located at the slow-opening position, the third chamber is communicated with the fourth chamber, and when the valve rod is located at the working position, the fourth chamber is communicated with the fifth chamber. Compared with the traditional multi-valve core assembly structure, the number of parts is reduced, the assembly process is simplified, and the production efficiency is improved. Moreover, the trigger pressure value of the slow-opening valve can be adjusted by adjusting the valve assembly, so that the slow-opening valve can adapt to the pressure requirements of different pneumatic systems.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pneumatic components, in particular to a slow-opening valve. BACKGROUND

[0002] The slow-opening valve (also known as soft-opening valve or slow-opening valve) is a key pneumatic component for realizing safety protection function in a pneumatic system. The structure of the slow-opening valve usually comprises an air inlet and an air outlet, and the air inlet and the air outlet are connected through a slow-opening air path and a working air path respectively. The slow-opening air path is provided with a throttling device, and the working air path is provided with a one-way communication device for communicating the path. In the initial stage of starting the pneumatic system, since the working pressure is not stable, when the air inlet of the slow-opening valve is connected to the air, the air inlet and the air outlet need to be communicated through the slow-opening air path, so that the pressure of the air outlet can be slowly increased. When the pressure of the air outlet rises to the trigger pressure value (trigger pressure value: a set pressure value, generally half of the pressure of the air inlet), the one-way communication device in the path of the working air path will automatically communicate, so as to make the pressure of the air outlet quickly rise to the same pressure as the air inlet, and thus the slow-opening valve completes the starting task and enters the working state.

[0003] For example, a kind of electric control type stable starting valve disclosed in Chinese utility model patent (authorized announcement number: CN206159549U) includes valve body, valve cover, valve seat, first valve core assembly, second valve core assembly and regulating valve assembly, valve cover and valve seat are respectively arranged at the two ends of valve body, first chamber and second chamber are formed between valve body and valve cover, third chamber is formed between valve body and valve seat;First valve core assembly is arranged in first chamber, second valve core assembly is arranged in second chamber;Valve cover is provided with pilot seat, fourth chamber is formed between pilot seat and valve cover, pilot seat is provided with gas guide hole communicated with fourth chamber, pilot seat and valve cover cooperate to form control gas channel, pilot seat is provided with electromagnetic pilot head for controlling the communication or cut-off of gas guide hole and control gas channel. Its structure is simple and reasonable, easy to install, high in action sensitivity, strong in sealing performance, long in service life and stable and reliable in working performance.

[0004] However, the electric control type stable starting valve disclosed in the above prior art is provided with first valve core assembly and second valve core assembly inside, and the two are assembled in first chamber and second chamber respectively. The complex structure design of the double valve core assembly, on the one hand, significantly increases the technical difficulty of production and assembly, leading to complicated assembly process and increased time consumption, directly reducing the overall production efficiency. On the other hand, the design of the double assembly requires additional investment of more material cost and processing cost, which greatly increases the manufacturing cost of the product, and is not conducive to the improvement of market competitiveness.

[0005] Therefore, it is necessary to improve the prior art. SUMMARY

[0006] The present application aims at the defects and deficiencies of the prior art, and provides a slow-opening valve, which has reduced parts and simplified assembly process compared with the traditional multi-valve core assembly structure, effectively improving production efficiency and reducing cost.

[0007] To achieve the above object, the present application adopts the following technical scheme:

[0008] A slow-opening valve, comprising a valve body with a valve cavity, the valve body being provided with an air inlet and an air outlet respectively communicating with the valve cavity, a valve rod being slidably arranged in the valve cavity, a floating piston being movably arranged above the valve rod, the valve cavity being divided into a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber by the floating piston and the valve rod, the fourth chamber always communicating with the air inlet, and the fifth chamber always communicating with the air outlet, the valve body being provided with a pilot gas path for connecting the air inlet and the first chamber, a slow-opening gas path for connecting the third chamber and the air outlet, and a drive gas path for connecting the slow-opening gas path and the second chamber, the valve rod being movable relative to the valve cavity between an initial position, a slow-opening position and a working position, the third chamber being isolated from the fourth chamber and the fourth chamber being isolated from the fifth chamber when the valve rod is in the initial position, the third chamber being communicated with the fourth chamber when the valve rod is in the slow-opening position, and the fourth chamber being communicated with the fifth chamber when the valve rod is in the working position, the valve rod being moved from the initial position to the slow-opening position when the air inlet is communicated with the first chamber through the pilot gas path, so that the second chamber is communicated with the air inlet, and then the valve rod is moved from the slow-opening position to the working position, a first spring being arranged in the valve cavity to make the valve rod always have a tendency to move to the initial position.

[0009] Further, the floating piston cooperates with the inner wall of the valve cavity to isolate the first chamber and the second chamber, and a fixed piston is further fixedly arranged at the upper end of the valve rod, the fixed piston cooperates with the inner wall of the valve cavity to isolate the second chamber and the third chamber.

[0010] Further, the outer peripheral wall of the valve rod is provided with a first protruding ring and a second protruding ring, the first protruding ring cooperates with the inner wall of the valve cavity to isolate the third chamber and the fourth chamber when the valve rod is in the initial position, and the second protruding ring cooperates with the inner wall of the valve cavity to isolate the fourth chamber and the fifth chamber, the first protruding ring is disengaged from the sealing cooperation with the inner wall of the valve cavity when the valve rod is in the slow-opening position, the third chamber is communicated with the fourth chamber, and then the slow-opening gas path is communicated with the air inlet, the second protruding ring is disengaged from the sealing cooperation with the inner wall of the valve cavity when the valve rod is in the working position, the fourth chamber is communicated with the fifth chamber, and then the air outlet is communicated with the air inlet.

[0011] Further, the slow-opening valve further comprises a pilot valve, the pilot gas path comprises a pilot inlet gas path for connecting the air inlet and the pilot valve, and a pilot outlet gas path for connecting the first chamber and the pilot valve.

[0012] Further, the pilot valve is an electromagnetic valve, when the pilot valve loses power, the pilot inlet gas path and the pilot outlet gas path are in a disconnected state; when the pilot valve is powered, the pilot inlet gas path and the pilot outlet gas path are in a connected state.

[0013] Further, the valve body comprises a valve body and a pilot seat, the pilot valve is arranged in the pilot seat, an adjusting chamber is formed in the pilot seat, and an adjusting valve assembly is arranged in the adjusting chamber, the adjusting valve assembly is used for adjusting the trigger pressure value of the slow-opening valve.

[0014] Further, the adjusting valve assembly comprises an adjusting piston, a second spring and an adjusting valve needle, the adjusting chamber is connected to the slow-opening gas path through an adjusting gas path, the drive gas path comprises a first drive gas path for connecting the pilot outlet gas path and the adjusting chamber, and a second drive gas path for connecting the adjusting chamber and the second chamber; the adjusting piston has a first position and a second position, when the adjusting piston is located at the first position, the first drive gas path and the second drive gas path are disconnected, when the adjusting piston is located at the second position, the first drive gas path and the second drive gas path are connected; the second spring is arranged between the adjusting piston and the adjusting valve needle, so that the adjusting piston always has a tendency to move to the first position; the adjusting valve needle can be screwed in and out relative to the adjusting chamber.

[0015] Further, the second chamber and the pilot outlet gas path are connected through an exhaust gas path, and a one-way check valve is arranged on the exhaust gas path, so that the gas can only flow from the second chamber to the pilot outlet gas path.

[0016] Further, the upper end of the valve body is provided with a convex rib, the convex rib is provided with a plurality of notches, and the second drive gas path and the second chamber are connected through the notches.

[0017] Further, the slow-opening gas path comprises a slow-opening inlet gas path and a slow-opening outlet gas path, and an adjusting screw for controlling the gas flow is arranged at the connection position of the slow-opening inlet gas path and the slow-opening outlet gas path.

[0018] After the above structure is adopted, the present application has the following beneficial effects:

[0019] (1) A slow-opening valve, comprising a valve body having a valve cavity, the valve body is respectively provided with an air inlet and an air outlet which are communicated with the valve cavity, a valve rod is slidably arranged in the valve cavity, a floating piston is movably arranged above the valve rod, the valve cavity is divided into a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber by the floating piston and the valve rod, the valve rod has an initial position, a slow-opening position and a working position, when the valve rod is located at the initial position, the third chamber and the fourth chamber, and the fourth chamber and the fifth chamber are isolated, when the valve rod is located at the slow-opening position, the third chamber and the fourth chamber are communicated, when the valve rod is located at the working position, the fourth chamber and the fifth chamber are communicated, when the air inlet is communicated with the first chamber through a pilot gas path, the valve rod moves from the initial position to the slow-opening position, the third chamber and the fourth chamber are communicated, and then the valve rod moves from the slow-opening position to the working position, the fourth chamber and the fifth chamber are communicated, a first spring is arranged in the valve cavity, so that the valve rod always has a tendency to move to the initial position, compared with the traditional multi-valve core assembly structure, the number of parts is greatly reduced, the assembly process is significantly simplified, and double optimization can be realized in the production link: on the one hand, the simplification of the number of parts reduces the comprehensive cost of material procurement, inventory management and processing manufacturing; on the other hand, the simplification of the assembly process effectively shortens the production cycle, reduces the manual operation link and potential errors, so that the overall production efficiency is significantly improved, and finally the double goals of cost reduction and efficiency increase are achieved, and a more optimal solution is provided for large-scale production.

[0020] (2) A slow-opening valve, the valve body comprises a valve body and a pilot seat, the pilot valve is arranged in the pilot seat, an adjusting cavity is formed in the pilot seat, an adjusting valve assembly is arranged in the adjusting cavity, the adjusting valve assembly is used for adjusting the size of the trigger pressure value of the slow-opening valve, and the adjusting valve assembly comprises an adjusting piston, a second spring and an adjusting valve needle. The size of the trigger pressure value of the slow-opening valve can be adjusted and controlled through the adjusting valve assembly, so that the slow-opening valve can adapt to the pressure requirements of different pneumatic systems, and the application scenarios and working condition adaptability of the slow-opening valve are significantly expanded. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application, the drawings needed in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a whole structure schematic diagram of the present application;

[0023] Figure 2 It is a whole structure cross section of the present application Figure One;

[0024] Figure 3 is the overall structure of the present application Figure Two ;

[0025] Figure 4 is the overall structure of the present application Figure Three ;

[0026] Figure 5 is the overall structure of the present application Figure Four ;

[0027] Figure 6 is the overall structure of the present application Figure Five ;

[0028] Figure 7 is the overall structure of the present application Figure One ;

[0029] Figure 8 is the overall structure of the present application Figure Two ;

[0030] Figure 9 is the overall structure of the present application Figure Three ;

[0031] Figure 10 is the overall structure of the present application

[0032] Figure 11 is the overall structure of the present application

[0033] Figures 1 to 11 is the overall structure of the present application

[0034] 1, valve body; 11, valve cavity; 111, first chamber; 112, second chamber; 113, third chamber; 114, fourth chamber; 115, fifth chamber; 12, inlet; 13, outlet; 14, valve body; 141, convex rib; 142, notch; 143, valve cover; 144, valve seat; 1441, exhaust passage; 15, pilot seat; 151, adjusting cavity; 2, valve stem; 21, fixed piston; 22, first convex ring; 221, first sealing ring; 23, second convex ring; 231, second sealing ring; 3, floating piston; 4, first spring; 5, pilot valve; 6, adjusting valve assembly; 61, adjusting piston; 62, second spring; 63, adjusting valve needle; 7, adjusting screw; 8, pressure gauge; 9, manual adjusting screw rod; 10, pilot gas path; 101, pilot inlet gas path; 102, pilot outlet gas path; 20, slow opening gas path; 201, slow opening inlet gas path; 202, slow opening outlet gas path; 30, drive gas path; 301, first drive gas path; 302, second drive gas path; 40, adjusting gas path; 50, exhaust gas path; 501, one-way check valve. DETAILED DESCRIPTION

[0035] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical characteristics. Thus, a feature with the "first", "second" designation can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of the term "plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0038] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, if there is a description of the first feature "on" or "under" the second feature and the like, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0040] It should be noted that if an element is referred to as "fixed to" or "disposed to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0042] As Figures 1 to 11As shown, a slow-opening valve comprises a valve body 1 having a valve cavity 11, the valve body 1 is respectively provided with an air inlet 12 and an air outlet 13 which are communicated with the valve cavity 11, a valve rod 2 is slidably arranged in the valve cavity 11, a floating piston 3 is movably arranged above the valve rod 2, the valve cavity 11 is divided into a first chamber 111, a second chamber 112, a third chamber 113, a fourth chamber 114 and a fifth chamber 115 by the floating piston 3 and the valve rod 2, the fourth chamber 114 is always communicated with the air inlet 12, and the fifth chamber 115 is always communicated with the air outlet 13; the valve body 1 is provided with a pilot gas path 10 for communicating the air inlet 12 and the first chamber 111, a slow-opening gas path 20 for communicating the third chamber 113 and the air outlet 13, and a driving gas path 30 for communicating the slow-opening gas path 20 and the second chamber 112; the valve rod 2 can move relative to the valve cavity 11 between an initial position, a slow-opening position and a working position; when the valve rod 2 is located at the initial position, the third chamber 113 is isolated from the fourth chamber 114, and the fourth chamber 114 is isolated from the fifth chamber 115; when the valve rod 2 is located at the slow-opening position, the third chamber 113 is communicated with the fourth chamber 114, and when the valve rod 2 is located at the working position, the fourth chamber 114 is communicated with the fifth chamber 115; when the air inlet 12 is communicated with the first chamber 111 through the pilot gas path 10, the valve rod 2 moves from the initial position to the slow-opening position, so that the second chamber 112 is communicated with the air inlet 12, and then the valve rod 2 moves from the slow-opening position to the working position; a first spring 4 is arranged in the valve cavity 11, so that the valve rod 2 always has a tendency to move to the initial position. The floating piston 3 cooperates with the inner wall of the valve cavity 11 to isolate the first chamber 111 and the second chamber 112; a fixed piston 21 is further fixedly arranged at the upper end of the valve rod 2, and the fixed piston 21 cooperates with the inner wall of the valve cavity 11 to isolate the second chamber 112 and the third chamber 113. The outer peripheral wall of the valve rod 2 is respectively provided with a first convex ring 22 and a second convex ring 23; when the valve rod 2 is located at the initial position, the first convex ring 22 cooperates with the inner wall of the valve cavity 11 to isolate the third chamber 113 from the fourth chamber 114, and the second convex ring 23 cooperates with the inner wall of the valve cavity 11 to isolate the fourth chamber 114 from the fifth chamber 115; when the valve rod 2 is located at the slow-opening position, the first convex ring 22 is disengaged from the sealing cooperation with the inner wall of the valve cavity 11, the third chamber 113 is communicated with the fourth chamber 114, and then the slow-opening gas path 20 is communicated with the air inlet 12; when the valve rod 2 is located at the working position, the second convex ring 23 is disengaged from the sealing cooperation with the inner wall of the valve cavity 11, the fourth chamber 114 is communicated with the fifth chamber 115, and then the air outlet 13 is communicated with the air inlet 12.

[0043] Based on the above embodiment, the application wants to provide a slow opening valve, comprising a valve body 1 with a valve cavity 11, the valve body 1 is respectively provided with an air inlet 12 and an air outlet 13 which are communicated with the valve cavity 11, a valve rod 2 is slidably arranged in the valve cavity 11, a floating piston 3 is movably arranged above the valve rod 2, the valve cavity 11 is divided into a first chamber 111, a second chamber 112, a third chamber 113, a fourth chamber 114 and a fifth chamber 115 by the floating piston 3 and the valve rod 2, the valve rod 2 has an initial position, a slow opening position and a working position, when the valve rod 2 is located at the initial position, the third chamber 113 and the fourth chamber 114, the fourth chamber 114 and the fifth chamber 115 are all isolated, when the valve rod 2 is located at the slow opening position, the third chamber 113 and the fourth chamber 114 are communicated, when the valve rod 2 is located at the working position, the fourth chamber 114 and the fifth chamber 115 are communicated; when the air inlet 12 is communicated with the first chamber 111 through a pilot gas path 10, the valve rod 2 is moved from the initial position to the slow opening position, the third chamber 113 and the fourth chamber 114 are communicated, so that the second chamber 112 is communicated with the air inlet 12, and then the valve rod 2 is moved from the slow opening position to the working position, the fourth chamber 114 and the fifth chamber 115 are communicated; a first spring 4 is arranged in the valve cavity 11, so that the valve rod 2 always has a tendency to move to the initial position. Compared with the traditional multi-valve core assembly structure, the number of parts is greatly reduced, the assembly process is significantly simplified, and double optimization is realized in the production link: on the one hand, the simplification of the number of parts reduces the comprehensive cost of material procurement, inventory management and processing manufacturing; on the other hand, the simplification of the assembly process effectively shortens the production cycle, reduces the manual operation link and potential errors, thereby significantly improving the overall production efficiency, finally achieving the dual goals of cost reduction and efficiency improvement, and providing a better solution for large-scale production.

[0044] As another preferred embodiment of the application, the slow opening valve further comprises a pilot valve 5, the pilot gas path 10 comprises a pilot inlet gas path 101 for communicating the air inlet 12 and the pilot valve 5, and a pilot outlet gas path 102 for communicating the first chamber 111 and the pilot valve 5. The pilot valve 5 is an electromagnetic valve, when the pilot valve 5 loses power, the pilot inlet gas path 101 and the pilot outlet gas path 102 are in a disconnected state; when the pilot valve 5 is powered on, the pilot inlet gas path 101 and the pilot outlet gas path 102 are in a connected state, that is, the pilot gas path 10 is communicated. The upper end of the valve body 14 is provided with a protruding rib 141, the protruding rib 141 is provided with a plurality of notches 142, the second drive gas path 302 and the second chamber 112 are communicated through the notches 142. The slow opening gas path 20 comprises a slow opening inlet gas path 201 and a slow opening outlet gas path 202, an adjusting screw 7 for controlling the gas flow is arranged at the communication position of the slow opening inlet gas path 201 and the slow opening outlet gas path 202.

[0045] In this embodiment, when air is supplied through the air inlet 12 and the pilot valve 5 is not energized, the valve stem 2 is in its initial position, such as... Figure 2 As shown, at this time, the third chamber 113 and the fourth chamber 114 are isolated, and the fourth chamber 114 and the fifth chamber 115 are isolated. When the pilot valve 5 is energized, the pilot inlet gas path 101 and the pilot outlet gas path 102 are connected, that is, the pilot gas path 10 is open, and the gas in the pilot inlet gas path 101 flows into the pilot outlet gas path 102. After entering the pilot outlet gas path 102, the gas is divided into two paths. One path of gas enters the first drive gas path 301, at which time the first drive gas path 301 is blocked by the adjusting piston 61; the other path of gas enters the first chamber 111 from the pilot outlet gas path 102. The floating piston 3 moves downward under the pressure of the gas. The floating piston 3 pushes the valve stem 2 to overcome the elastic force of the first spring 4 and moves from the initial position to the soft start position, as shown. Figure 3 As shown, at this time, the third chamber 113 and the fourth chamber 114 are connected, that is, the first convex ring 22 is disengaged from the inner wall of the valve chamber 11 and the sealing fit is broken. The gas enters the slow-opening intake air passage 201 through the air inlet 12, the third chamber 113 and the fourth chamber 114. After entering the slow-opening intake air passage 201, the gas is divided into two paths. One path flows from the slow-opening intake air passage 201 and the slow-opening outlet air passage 202 into the outlet 13, so that the pressure at the outlet 13 can rise slowly. The other path flows from the regulating air passage 40 into the regulating chamber 151, such as... Figure 7 and Figure 8 As shown, this causes the adjusting piston 61 to move from the first position to the second position against the elastic force of the second spring 62, as... Figure 9 As shown, at this time, the second driving air passage 302 is connected to the first driving air passage 301. The gas in the first driving air passage 301 enters the second chamber 112 through the second driving air passage 302 and the notch 142 of the rib 141. Under the pressure of the gas, the valve stem 2 further overcomes the elastic force of the first spring 4 and moves downward, causing the valve stem 2 to move from the slow-opening position to the working position. At this time, the second convex ring 23 disengages from the sealing fit with the inner wall of the valve cavity 11, that is, the fourth chamber 114 and the fifth chamber 115 are connected, and the air outlet 13 is connected to the air inlet 12. Figure 4 As shown, this causes the pressure at the outlet 13 to rise rapidly to the same pressure as the inlet 12, at which point the slow-opening valve completes its startup task and enters the working state.

[0046] In a further embodiment, such as Figure 4 As shown, the pilot seat 15 is equipped with a manual adjusting screw 9 for manually controlling the connection and disconnection of the pilot intake air passage 101 and the pilot exhaust air passage 102. When the pilot valve 5 fails to work properly, the pilot intake air passage 101 and the pilot exhaust air passage 102 are connected or disconnected by manually adjusting the screw 9.

[0047] In further embodiments, as shown in Figure 2 a first sealing ring 221 is arranged between the first convex ring 22 and the inner wall of the valve cavity 11, and the first sealing ring 221 is configured to improve the air tightness between the first convex ring 22 and the inner wall of the valve cavity 11; a second sealing ring 231 is arranged between the second convex ring 23 and the inner wall of the valve cavity 11, and the second sealing ring 231 is configured to improve the air tightness between the second convex ring 23 and the inner wall of the valve cavity 11.

[0048] As another preferred embodiment of the present application, the valve body 1 comprises a valve body 14 and a pilot seat 15, the pilot valve 5 is arranged in the pilot seat 15, an adjusting cavity 151 is formed in the pilot seat 15, and an adjusting valve assembly 6 is arranged in the adjusting cavity 151, the adjusting valve assembly 6 is configured to adjust the trigger pressure value of the slow opening valve. The adjusting valve assembly 6 comprises an adjusting piston 61, a second spring 62, and an adjusting valve needle 63, the adjusting cavity 151 is connected to the slow opening gas path 20 through an adjusting gas path 40, the drive gas path 30 comprises a first drive gas path 301 for connecting the pilot outlet gas path 102 and the adjusting cavity 151, and a second drive gas path 302 for connecting the adjusting cavity 151 and the second cavity 112; the adjusting piston 61 has a first position and a second position, when the adjusting piston 61 is in the first position, the first drive gas path 301 is disconnected from the second drive gas path 302, and when the adjusting piston 61 is in the second position, the first drive gas path 301 is connected to the second drive gas path 302; the second spring 62 is arranged between the adjusting piston 61 and the adjusting valve needle 63, so that the adjusting piston 61 always has a tendency to move to the first position; and the adjusting valve needle 63 can be screwed in and out relative to the adjusting cavity 151.

[0049] In the present embodiment, as shown in Figure 9 the adjusting valve assembly 6 can be used to adjust the trigger pressure value of the slow opening valve, specifically, when the adjusting valve needle 63 is screwed in relative to the adjusting cavity 151, the second spring 62 is compressed by the adjusting valve needle 63, so that when the adjusting piston 61 moves from the first position to the second position, a greater elastic force needs to be overcome, so that the trigger pressure value increases; on the contrary, when the adjusting valve needle 63 is screwed out relative to the adjusting cavity 151, so that when the adjusting piston 61 moves from the first position to the second position, a smaller elastic force needs to be overcome, so that the trigger pressure value decreases. By adjusting the trigger pressure value of the slow opening valve through the adjusting valve assembly 6, the slow opening valve can adapt to the pressure requirements of different pneumatic systems, significantly expanding the application scenarios and working condition adaptability of the slow opening valve.

[0050] As another preferred scheme of the present application, the second chamber 112 is provided with an exhaust gas path 50 between the second chamber 112 and the pilot exhaust gas path 102, and a one-way check valve 501 is arranged on the exhaust gas path 50, so that the gas can only flow from the second chamber 112 to the pilot exhaust gas path 102. The upper end of the valve body 14 is provided with a valve cover 143, and the lower end of the valve body 14 is provided with a valve seat 144, and the pilot seat 15 is arranged above the valve cover 143. The valve seat 144 is provided with an exhaust passage 1441 for communicating the fifth chamber 115 with the atmosphere, and when the valve rod 2 is in the initial position, the exhaust passage 1441 is in an open state, and when the valve rod 2 is in the slow opening position or the working position, the exhaust passage 1441 is blocked by the valve rod 2. In the present embodiment, as shown in Figure 3 the one-way check valve 501 is arranged to make the gas flow only from the second chamber 112 to the pilot exhaust gas path 102, so as to realize the exhaust of the second chamber 112; and when the pilot valve 5 is powered on, the pilot inlet gas path 101 and the pilot exhaust gas path 102 are communicated, and when the gas enters the first chamber 111, the one-way check valve 501 can prevent the gas from entering the second chamber 112. Through the structure design, the first chamber 111 and the second chamber 112 are both exhausted by the pilot valve 5, and the separate gas inlet of the first chamber 111 and the second chamber 112 can be realized. In the present embodiment, the first chamber 111 and the second chamber 112 are both exhausted by the pilot valve 5, and specifically, as shown in Figure 4 when the pilot valve 5 is powered off, the gas in the first chamber 111 enters the chamber of the pilot valve 5 through the pilot exhaust gas path 102; the gas in the second chamber 112 flows into the exhaust gas path 50, at this time, the one-way check valve 501 is opened under the action of the gas pressure, the gas in the exhaust gas path 50 flows into the pilot exhaust gas path 102, and then enters the chamber of the pilot valve 5, and then the gas in the chamber of the pilot valve 5 continuously flows along the gap between the pilot valve core and the pilot valve body, and flows into the inner cavity of the pilot static iron core, and finally is exhausted from the exhaust port of the pilot valve 5 into the atmosphere, at this time, the valve rod 2 is restored to the initial position under the elastic force of the first spring 4, and the gas in the fifth chamber 115 is exhausted from the exhaust passage 1441.

[0051] As another preferred scheme of the present application, the valve body 14 is further provided with a pressure gauge 8 communicated with the gas outlet 13. In the present embodiment, as shown in Figure 1As shown, the pressure gauge 8 has the key function of monitoring and feeding back pressure data in real time, intuitively presents the pressure value of the gas through the dial scale or digital display, helps the operator to judge whether the slow-opening valve is in normal working state, and ensures that the pressure fluctuates within a safe and stable range; in a further preferred embodiment, when the system pressure abnormally rises or falls, the pressure gauge 8 can send an early warning signal in time, so that the technical personnel can quickly troubleshoot the fault and avoid equipment damage or safety accidents caused by out-of-control pressure; in addition, the pressure gauge 8 also provides an accurate basis for equipment debugging, maintenance and optimization of operating parameters, and by analyzing the pressure change trend, the opening speed and pressure output of the slow-opening valve can be accurately adjusted to improve the system operation efficiency and reliability.

[0052] Obviously, the above embodiments are only examples for clearly illustrating, but not limit the embodiments. For those skilled in the field, based on the above description, other different forms of changes or variations can also be made. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A slow-opening valve, comprising a valve body (1) having a valve cavity (11), wherein the valve body (1) is provided with an air inlet (12) and an air outlet (13) communicating with the valve cavity (11), a valve stem (2) is slidably disposed within the valve cavity (11), and a floating piston (3) is movably disposed above the valve stem (2), characterized in that: The valve cavity (11) is separated into a first chamber (111), a second chamber (112), a third chamber (113), a fourth chamber (114) and a fifth chamber (115) by a floating piston (3) and a valve stem (2), the fourth chamber (114) is always communicated with an air inlet (12), and the fifth chamber (115) is always communicated with an air outlet (13); the valve body (1) is provided with a pilot gas path (10) for communicating the air inlet (12) and the first chamber (111), a slow start gas path (20) for communicating the third chamber (113) and the air outlet (13), and a driving gas path (30) for communicating the slow start gas path (20) and the second chamber (112); The valve stem (2) can move relative to the valve cavity (11) between an initial position, a slow start position and a working position; When the valve stem (2) is located at the initial position, the third chamber (113) is isolated from the fourth chamber (114), and the fourth chamber (114) is isolated from the fifth chamber (115); When the valve stem (2) is located at the slow start position, the third chamber (113) is communicated with the fourth chamber (114), and when the valve stem (2) is located at the working position, the fourth chamber (114) is communicated with the fifth chamber (115); When the air inlet (12) is communicated with the first chamber (111) through the pilot gas path (10), the valve stem (2) is moved from the initial position to the slow start position, so that the second chamber (112) is communicated with the air inlet (12), and then the valve stem (2) is moved from the slow start position to the working position; a first spring (4) is arranged in the valve cavity (11) to make the valve stem (2) always have a tendency to move to the initial position.

2. A slow open valve according to claim 1, characterised in that: The floating piston (3) cooperates with the inner wall of the valve cavity (11) to isolate the first chamber (111) and the second chamber (112); the upper end of the valve stem (2) is further fixedly provided with a fixed piston (21), and the fixed piston (21) cooperates with the inner wall of the valve cavity (11) to isolate the second chamber (112) and the third chamber (113).

3. A slow open valve according to claim 1, wherein: The outer peripheral wall of the valve stem (2) is respectively provided with a first convex ring (22) and a second convex ring (23), when the valve stem (2) is located at the initial position, the first convex ring (22) cooperates with the inner wall of the valve cavity (11) to isolate the third chamber (113) from the fourth chamber (114), and the second convex ring (23) cooperates with the inner wall of the valve cavity (11) to isolate the fourth chamber (114) from the fifth chamber (115); when the valve stem (2) is located at the slow start position, the first convex ring (22) is disengaged from the sealing cooperation with the inner wall of the valve cavity (11), the third chamber (113) is communicated with the fourth chamber (114), and then the slow start gas path (20) is communicated with the air inlet (12); when the valve stem (2) is located at the working position, the second convex ring (23) is disengaged from the sealing cooperation with the inner wall of the valve cavity (11), the fourth chamber (114) is communicated with the fifth chamber (115), and then the air outlet (13) is communicated with the air inlet (12).

4. A slow open valve according to claim 1, wherein: The slow-opening valve further comprises a pilot valve (5), the pilot gas path (10) comprises a pilot inlet gas path (101) for connecting the air inlet (12) and the pilot valve (5), and a pilot outlet gas path (102) for connecting the first chamber (111) and the pilot valve (5).

5. A slow open valve according to claim 4, characterised in that: The pilot valve (5) is an electromagnetic valve, when the pilot valve (5) is de-energized, the pilot inlet gas path (101) and the pilot outlet gas path (102) are in a disconnected state; when the pilot valve (5) is energized, the pilot inlet gas path (101) and the pilot outlet gas path (102) are in a connected state.

6. A slow open valve according to claim 4, wherein: The valve body (1) comprises a valve body (14) and a pilot seat (15), the pilot valve (5) is arranged in the pilot seat (15), the pilot seat (15) is formed with an adjusting chamber (151), and an adjusting valve assembly (6) is arranged in the adjusting chamber (151), and the adjusting valve assembly (6) is used for adjusting the trigger pressure value of the slow-opening valve.

7. A slow open valve according to claim 6, characterised in that: The adjusting valve assembly (6) comprises an adjusting piston (61), a second spring (62) and an adjusting valve needle (63), the adjusting chamber (151) is connected to the slow-opening gas path (20) through an adjusting gas path (40), the drive gas path (30) comprises a first drive gas path (301) for connecting the pilot outlet gas path (102) and the adjusting chamber (151), and a second drive gas path (302) for connecting the adjusting chamber (151) and the second chamber (112); the adjusting piston (61) has a first position and a second position, when the adjusting piston (61) is located at the first position, the first drive gas path (301) and the second drive gas path (302) are disconnected, when the adjusting piston (61) is located at the second position, the first drive gas path (301) and the second drive gas path (302) are connected; the second spring (62) is arranged between the adjusting piston (61) and the adjusting valve needle (63), so that the adjusting piston (61) always has a tendency to move to the first position; the adjusting valve needle (63) can be screwed in and out relative to the adjusting chamber (151).

8. A slow open valve according to claim 7, characterised in that: The second chamber (112) and the pilot outlet gas path (102) are provided with an exhaust gas path (50), and a one-way check valve (501) is arranged on the exhaust gas path (50), so that gas can only flow from the second chamber (112) to the pilot outlet gas path (102).

9. A slow open valve according to claim 7, wherein: The upper end of the valve body (14) is provided with a convex rib (141), the convex rib (141) is provided with a plurality of notches (142), and the second drive gas path (302) and the second chamber (112) are connected through the notches (142).

10. A slow open valve according to claim 1, characterized in that: The slow-opening gas path (20) comprises a slow-opening inlet gas path (201) and a slow-opening outlet gas path (202), and an adjusting screw (7) for controlling the flow of gas is arranged at the connection position of the slow-opening inlet gas path (201) and the slow-opening outlet gas path (202).

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