Flow adjustable pneumatic control valve

Abstract

The present invention provides a flow rate adjustable pneumatic control valve, comprising: a valve body: a first radially protruding structure and a second radially protruding structure are arranged at intervals in the valve body cavity; a piston seat: installed in the valve body cavity, radially closing the valve body cavity, and a rod hole is arranged along the axial direction of the piston seat; a piston rod: passing through the rod hole on the piston seat, passing through the through hole of the first radially protruding structure, and capable of passing through the through hole of the second radially protruding structure; an adjusting member is installed thereon; a piston body is arranged along the radial direction of the piston rod, located between the first radially protruding structure and the piston seat: a first elastic member: installed between the first radially protruding structure and the piston body; a valve seat: installed in the valve body cavity, radially closing the valve body cavity, and a valve seat through hole is arranged thereon; a valve core assembly: installed on the valve seat, and the valve core rod passes through the valve seat through hole in the direction away from the piston seat. By arranging an adjusting member on the piston rod to adjust and control the working length of the piston rod, the flow rate can be adjusted to meet the requirements of the flow rate of the pneumatic control valve under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle braking, and relates to a flow adjustable pneumatic control valve. Background Art

[0002] Pneumatic control valves are commonly used in rail vehicle braking control systems to control the on / off or commutation of air circuits. Open / closed (two-position two-way) pneumatic control valves usually adopt a planar cut-off sealing structure with a spool and piston structure.

[0003] The structure of the existing open / closed (two-position two-way) pneumatic control valve has the following deficiencies.

[0004] (1) For an open / closed (two-position two-way) pneumatic control valve, usually its flow rate depends on the internal valve port diameter, and the size of the valve port diameter cannot be adjusted, that is, the traditional pneumatic control valve cannot adjust the flow rate;

[0005] (2) For a pneumatic control valve with a split spool and piston, there is no case where a travel switch is set, that is, the opening and closing state of the valve port cannot be feedback in real time. Summary of the Invention

[0006] The purpose of the present invention is to solve one of the above technical problems, and provide a pneumatic control valve with a flow regulation function.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is:

[0008] A flow adjustable pneumatic control valve, comprising:

[0009] A valve body: forming a valve body cavity, along the radial direction of the valve body cavity, the valve body cavity is provided with a first radially protruding structure and a second radially protruding structure at intervals, and through holes are formed in both protruding structures;

[0010] A piston seat: installed in the valve body cavity, closing the valve body cavity along the radial direction, and a rod hole is provided along the axial direction of the piston seat;

[0011] A piston rod: passing through the rod hole on the piston seat, passing through the through hole of the first radially protruding structure, and can pass through the through hole of the second radially protruding structure during movement; an adjusting member is installed thereon, and the adjusting member can move along the piston rod; a piston body is provided along the radial direction of the piston rod, closing the valve body cavity along the radial direction, located between the first radially protruding structure and the piston seat, and forming a first clearance cavity with the piston seat;

[0012] A first elastic member: installed between the first radially protruding structure and the piston body;

[0013] A valve seat: installed in the valve body cavity, closing the valve body cavity along the radial direction, and provided with a valve seat through hole thereon;

[0014] Spool assembly: Installed on the valve seat, including a spool body and a spool rod provided on the spool body. In the initial state, the spool body closes the through-hole of the second radially protruding structure, and the spool rod passes through the valve seat through-hole in the direction away from the piston seat;

[0015] Travel switch: Set on the side where the spool rod passes through, within the travel range of the spool rod, and can contact the spool rod.

[0016] In some embodiments of the present invention, the pneumatic control valve further includes an end cover, installed on the valve body, on the side close to the valve seat, and the travel switch is installed on the end cover.

[0017] In some embodiments of the present invention, a first air hole is provided on the side wall of the valve body between the first radially protruding structure and the piston body.

[0018] In some embodiments of the present invention, a second air hole is provided on the end cover.

[0019] In some embodiments of the present invention, a pressing plate is provided at the passing end of the spool rod, and the pressing plate can contact the travel switch.

[0020] In some embodiments of the present invention, the second radially protruding structure includes a radial main body end plate and an axial protruding portion, and the axial protruding portion protrudes toward the travel switch side and contacts the spool body.

[0021] In some embodiments of the present invention, the valve seat includes a valve seat groove, the spool body is installed in the valve seat groove and can move along the valve seat groove. A spool spring is provided at the bottom of the valve seat groove, and both ends of the spool spring are respectively in contact with the bottom of the valve seat groove and the spool assembly, and is in a compressed state.

[0022] In some embodiments of the present invention, the spool body includes a main body end plate and an insertion portion provided along the main body end plate. The insertion portion forms an insertion cavity. The main body end plate has a larger radial width relative to the insertion portion. The insertion portion is inserted into the valve seat groove and cooperates with the inner wall of the valve seat groove. A spool rod hole and a vent hole are provided on the main body end plate, and the spool rod passes through the spool rod hole.

[0023] In some embodiments of the present invention, a spool spring is further provided between the main body end plate and the bottom of the valve seat groove, and a part of the spool spring is located in the insertion cavity.

[0024] In some embodiments of the present invention, a dust cover is further included, installed at the opening of the valve body cavity, on the side where the piston rod extends out of the valve body cavity.

[0025] In some embodiments of the present invention, the adjusting member is a nut, installed on the side where the piston rod extends out of the valve body cavity.

[0026] The flow rate adjustable pneumatic control valve provided by the present invention has the beneficial effects that:

[0027] (1) By providing an adjusting member on the piston rod and controlling the working length of the piston rod through the adjusting member, the pneumatic control valve provided by the present invention can achieve adjustable flow rate and meet the requirements of different working conditions for the flow rate of the pneumatic control valve;

[0028] (2) The pneumatic control valve provided by the present invention is provided with a travel switch and a floating valve core rod, which can accurately feedback the opening and closing conditions of the internal passage of the pneumatic control valve in real time, and can avoid the wrong state feedback caused by the jamming of the piston assembly;

[0029] (3) The air guide holes provided in the valve core assembly of the pneumatic control valve provided by the present invention can eliminate the pressure difference on both sides of the valve core, and the valve core is not affected by the axial pressure, which improves the working pressure range of the pneumatic control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1a It is a schematic diagram of the first implementation structure of the flow rate adjustable pneumatic control valve.

[0032] Figure 1b It is a schematic diagram of the second implementation structure of the flow rate adjustable pneumatic control valve.

[0033] Figure 2a It is a schematic diagram of the first implementation structure of the valve body combination.

[0034] Figure 2b It is a schematic diagram of the second implementation structure of the valve body combination.

[0035] Figure 3 It is a schematic diagram of the valve seat and the valve core assembly structure.

[0036] Figure 4 It is a schematic diagram of the valve core body structure.

[0037] Among them:

[0038] 1 - valve body, 101 - form a valve body cavity, 102 - first radial protrusion structure, 103 - second radial protrusion structure, 104 - first air hole;

[0039] 2 - piston seat, 201 - rod hole;

[0040] 3 - piston rod, 301 - nut, 302 - piston body;

[0041] 4 - return spring;

[0042] 5 - valve seat;

[0043] 6 - spool assembly, 601 - spool body, 6011 - main body end plate, 6012 - insertion part, 6013 - ventilation hole, 6014 - valve stem hole, 602 - spool stem, 6021 - pressing plate;

[0044] 7 - travel switch;

[0045] 8 - end cover, 801 - second air hole;

[0046] 901 - first seal, 902 - second seal, 903 - third seal, 904 - fourth seal, 905 - fifth seal, 906 - sixth seal, 907 - seventh seal, 908 - eighth seal, 909 - ninth seal, 910 - tenth seal;

[0047] 10 - spool spring;

[0048] 11 - dust cover;

[0049] 12 - valve port;

[0050] 13 - first snap ring;

[0051] 14 - second snap ring. Detailed implementation manners

[0052] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] It should be noted that when an element is referred to as being "disposed on" or "connected to" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0054] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0055] The present invention provides a pneumatic control valve, which is a cut-off seal (axial seal) and two-position two-way structure.

[0056] Structural reference of the flow rate adjustable pneumatic control valve Figure 1a and Figure 1b, including: valve body 1, piston seat 2, piston rod 3, first elastic member, valve core assembly, etc.

[0057] Valve body 1: Structural reference Figure 2a and Figure 2b , forming a valve body cavity 101. Along the radial direction of the valve body cavity 101, a first radial protruding structure 102 and a second radial protruding structure 103 are arranged at intervals in the valve body cavity 101. Through holes are formed in both protruding structures, and the through holes of the two are opposite to each other. A valve port 12 is provided at the through hole of the second radial protruding structure 103. Reference Figure 1b and Figure 2b , in some embodiments, grooves are provided at both axial ends of the inner wall of the valve body cavity 101 for installing a first elastic retaining ring 13 and a second elastic retaining ring 14.

[0058] Piston seat 2: Fixedly installed in the valve body cavity 101 through a first elastic retaining ring 13, closing the valve body cavity 101 along the radial direction. A rod hole 201 is provided along the axial center line position of the piston seat 2, and the rod hole 201 is opposite to the through hole of the first radial protruding structure 102. A first seal 901 is provided between the piston seat 2 and the inner wall of the valve body cavity 101. Specifically, a seal groove is provided on the outer cylindrical surface of the piston seat 2, and the first seal 901 is installed in the seal groove for installing a sealing ring to seal with the valve body 1.

[0059] Piston rod 3: Passes through the rod hole 201 on the piston seat 2, passes through the through hole of the first radial protruding structure 102, and can pass through the through hole of the second radial protruding structure 103 during movement; an adjusting member is installed thereon, and the adjusting member can move along the piston rod. In this embodiment, the adjusting member is a nut 301, which is installed on one side of the piston rod 3 extending out of the valve body cavity and is threadedly installed on the piston rod 3 outside the valve body; the nut 301 can be rotated to adjust the length of the piston rod 3 extending into the valve body cavity 101; a piston body 302 is arranged along the radial direction of the piston rod 3, which is a flat plate-like structure arranged on the piston rod 3, closing the valve body cavity 101 along the radial direction, located between the first radial protruding structure 102 and the piston seat 2, and forming a first gap cavity with the piston seat 2: This gap cavity is defined as a pre-control cavity P. A second seal 902 is provided between the piston body 302 and the inner wall of the cavity, a third seal 903 is provided between the piston rod 3 and the rod hole 201, and a fourth seal 904 is provided between the piston rod 3 and the through hole of the first radial protruding structure 102.

[0060] Specifically, a seal groove is provided on the outer periphery of the piston body 302, a seal groove is provided at the rod hole 201 of the piston seat 2, and a seal groove is provided at the through hole of the first radial protruding structure 102, respectively for installing corresponding seals.

[0061] First elastic member: Installed between the first radial protruding structure 102 and the piston body 302; a spring is used, defined as a return spring 4. The central axis of the return spring 4 is collinear with the central axis of the piston rod 3.

[0062] Valve seat 5: It is fixedly installed in the valve body cavity 101 through the second elastic retaining ring 14, radially closes the valve body cavity 101, and is provided with a valve seat through-hole thereon; a fifth seal 905 is provided between the valve seat 5 and the inner wall of the valve body cavity 101; a ninth seal 909 is provided between the valve seat 5 and the valve core rod 602. Specifically, a sealing groove is provided on the outer surface of the valve seat 5 for installing the fifth seal 905; a sealing groove is provided on the inner surface of the valve seat through-hole of the valve seat 5 for installing the ninth seal 909.

[0063] Valve core assembly 6: Refer to Figure 3 and Figure 4 , and is installed on the valve seat 5, including a valve core body 601 and a valve core rod 602 provided on the valve core body 601. In the initial state, the valve core body 601 closes the through-hole of the second radially protruding structure 103 (this through-hole is defined as the valve port 12). After the overall movement of the valve core assembly 6, the closing of the valve port 12 can be released; the valve core rod 602 passes through the valve core rod hole 6014 in the direction away from the piston seat 2. A working chamber A is formed between the valve core assembly 6 and the second radially protruding structure 103 and the first radially protruding structure 102. A working chamber B is formed between the valve core assembly 6 and the second radially protruding structure 103 and the valve seat 5. A tenth seal 910 is provided between the valve core body 601 and the valve core rod 602. Specifically, a sealing groove is provided on the inner surface of the valve core rod hole 6014 for installing the tenth seal 910.

[0064] In some embodiments of the present invention, the pneumatic control valve further includes a travel switch 7: It is provided on the side where the valve core rod 602 passes through, within the travel range of the valve core rod 602, and can contact the valve core rod 602.

[0065] The structure of the connection between the valve core assembly 6 and the valve core rod 602 is as follows: The end with a larger diameter of the valve core rod 602 is installed in the valve core rod hole 6014 on the end face of the valve core assembly, and is limited by the end face of the valve core rod hole 6014. The end with a smaller diameter of the valve core rod 602 penetrates the valve core rod hole 6014 on the end face of the valve core assembly 6, and the valve core rod 602 can move axially; when there is a pre-control pressure in the pre-control chamber P, that is, when the piston rod 3 moves to the left, the right end face of the valve core rod 602 is pressed by the piston rod 3, and the piston rod 3 pushes the valve core assembly 6 to move to the left, and the working chambers A and B are communicated, and the travel switch 7 is pressed and the state is switched; when the pre-control pressure is emptied, that is, when the piston rod 3 moves to the right, the valve core assembly 6 moves to the right under the action of the valve core spring 10, and at the same time pushes the valve core rod 602 to move to the right, the working chambers A and B are cut off, and the travel switch 7 is released and the state is switched.

[0066] In order to solve the problem of travel switch installation, in some embodiments of the present invention, the air-controlled valve further includes an end cover 8, which is installed on the valve body 1 and located on a side close to the valve seat 5, and the travel switch 7 is installed on the bottom plane inside the end cover 8. A sixth sealing member 906 is provided at the installation position of the end cover 8 and the valve body 1. Specifically, a sealing groove is provided on the surface of the end cover 8 that matches the valve body 1, for installing the sixth sealing member 906.

[0067] In some embodiments of the present invention, a first air hole 104 is provided on the side wall of the valve body between the first radial protrusion structure and the piston body, and a second air hole 801 is provided on the end cover 8. The first air hole 104 and the second air hole 801 are both breathing holes (open to the atmosphere) for maintaining a constant pressure on one side of the piston body 302 and the valve core rod 602.

[0068] In some embodiments of the present invention, in order to ensure stable triggering of the travel switch 7, a pressure plate 6021 is provided at the protruding end of the valve core rod 602, which is coaxial with the travel switch 7, and the pressure plate 6021 can contact the travel switch 7. The pressure plate 6021 is threadedly mounted on the valve core rod 602, and can be rotated to generate axial movement to adjust the triggering distance between the pressure plate 6021 and the travel switch 7.

[0069] In some embodiments of the present invention, the second radial protrusion structure 103 includes a radial main body end plate and an axial protrusion, and the axial protrusion protrudes toward the travel switch 7 and contacts the seventh sealing member 907 on the end surface of the main body end plate 6011 .

[0070] In some embodiments of the present invention, the valve seat 5 forms a valve seat groove 501 structure, the valve core body 601 is installed in the valve seat groove 501, and can move axially along the valve seat groove 501. A valve core spring 10 is arranged at the bottom of the valve seat groove 501, and the two ends of the valve core spring 10 are respectively in contact with the valve seat 5 and the valve core assembly 6 and are in a compressed state.

[0071] In some embodiments of the present invention, the valve core body 601 includes a main end plate 6011 and an insertion portion 6012 arranged along the main end plate, the insertion portion 6012 forms an insertion cavity, the main end plate 6011 has a larger radial width relative to the insertion portion 6012, the insertion portion 6012 is inserted into the valve seat groove 501 and cooperates with the inner wall of the valve seat groove 501, the main end plate 6011 is provided with a valve core rod hole 6014 and an air vent 6013, and the valve core rod 602 passes through the valve core rod hole 6014.

[0072] The end surface of the main body end plate 6011 is directly in contact with the valve port 12 of the second radial protrusion structure 103 . Sealing material is vulcanized on the end surface of the main body end plate 6011 to form a seventh sealing member 907 that cooperates with the valve port 12 .

[0073] In some embodiments of the present invention, further included is a valve core spring 10 disposed between the main body end plate 6011 and the bottom of the valve seat groove 501. A part of the valve core spring 10 is located in the insertion cavity, and the valve core spring 10 fills the space between the main body end plate 6011 and the bottom of the valve seat groove 501. The central axis of the valve core spring 10 is collinear with the central axis of the valve core rod 602.

[0074] In some embodiments of the present invention, further included is a dust cover 11, which is installed at the opening of the valve body cavity and is located on the side where the piston rod 3 extends out of the valve body cavity 101. The dust cover 11 is used for the overall dust protection of the valve body cavity 1.

[0075] The working principle of the flow - adjustable pneumatic control valve provided by the present invention is as follows.

[0076] Taking the direction shown in the attached drawings as a reference. When a certain pressure of gas is filled into the pre - control cavity P: the piston body 302 is subjected to the gas pressure and moves leftward against the pressure of the return spring 4; the piston rod 3 moves leftward, and after contacting the valve core assembly 6, it pushes the valve core assembly 6 and the valve core rod 602 to move leftward. The valve core spring 10 is compressed, and the valve core assembly 6 is separated from the valve port 12. At this time, the working cavity B and the working cavity A are communicated, and the valve core rod 602 contacts the travel switch 7, and the state of the travel switch 7 is switched, that is, the pneumatic control valve is in the open state.

[0077] Before work, according to needs, by adjusting the position of the adjusting nut 301, the maximum displacement of the piston rod 3 moving leftward can be changed, and further the opening distance between the valve core assembly 6 and the valve port 12 can be changed to achieve flow regulation; by adjusting the axial displacement of the pressing plate 6021 to be equal to the axial displacement of the adjusting nut 301, the accurate output of the travel switch 7 can be ensured.

[0078] When the pressure gas in the pre - control cavity P is emptied: the piston rod 3 moves rightward to the reset position under the elastic force of the return spring 4, and the valve core assembly 6 moves rightward to the reset position under the elastic force of the valve core spring 10. The valve core assembly 6 contacts the second radial protrusion structure 103. At this time, the valve port 12 is closed, the working cavity B and the working cavity A are cut off, the valve core rod 602 disengages from triggering the travel switch 7, and the pneumatic control valve is in the closed state.

[0079] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flow rate adjustable pneumatic control valve, characterized in that, Comprising: Valve body: Forming a valve body cavity, along the radial direction of the valve body cavity, a first radially protruding structure and a second radially protruding structure are spaced apart, and through holes are formed in both protruding structures; Piston seat: Installed in the valve body cavity, closing the valve body cavity along the radial direction, and a rod hole is provided along the axial direction of the piston seat; Piston rod: Passing through the rod hole on the piston seat, passing through the through hole of the first radially protruding structure, and can pass through the through hole of the second radially protruding structure during movement; An adjusting member is installed thereon, and the adjusting member can move along the piston rod; A piston body is provided along the radial direction of the piston rod, closing the valve body cavity along the radial direction, located between the first radially protruding structure and the piston seat, and forming a first clearance cavity with the piston seat; First elastic member: Installed between the first radially protruding structure and the piston body; Valve seat: Installed in the valve body cavity, closing the valve body cavity along the radial direction, and a valve seat through hole is provided thereon; Valve core assembly: Installed on the valve seat, including a valve core body and a valve core rod provided on the valve core body. In the initial state, the valve core body closes the through hole of the second radially protruding structure, and the valve core rod passes through the valve seat through hole in the direction away from the piston seat; When the first clearance cavity is filled with gas, after the piston body is subjected to gas pressure and moves, after contacting the valve core assembly, it pushes the valve core assembly and the valve core rod to move, and the valve core assembly is separated from the through hole of the second radially protruding structure.

2. The flow rate adjustable pneumatic control valve according to claim 1, wherein Further comprising a travel switch: Provided on the side where the valve core rod exits, within the travel range of the valve core rod, and can contact the valve core rod.

3. The flow rate adjustable pneumatic control valve according to claim 2, characterized in that, Further comprising an end cover, installed on the valve body, on the side close to the valve seat, and the travel switch is installed on the end cover.

4. The flow rate adjustable pneumatic control valve according to claim 1 or 2, characterized in that, A pressing plate is provided at the exiting end of the valve core rod, and the pressing plate can contact the travel switch.

5. The flow rate adjustable pneumatic control valve according to claim 1, characterized in that, The second radially protruding structure includes a radial main body end plate and an axial protruding portion, and the axial protruding portion protrudes towards the travel switch side and contacts the valve core body.

6. The flow rate adjustable pneumatic control valve according to claim 1 or 5, characterized in that, The valve seat includes a valve seat groove, the valve core body is installed in the valve seat groove and can move along the valve seat groove, and a valve core spring is provided at the bottom of the valve seat groove.

7. The flow rate adjustable pneumatic control valve according to claim 6, wherein, The valve core body includes a main body end plate and an insertion portion provided along the main body end plate. The insertion portion forms an insertion cavity. The main body end plate has a larger radial width relative to the insertion portion. The insertion portion is inserted into the valve seat groove and cooperates with the inner wall of the valve seat groove. A valve core rod hole and a vent hole are provided on the main body end plate, and the valve core rod passes through the valve core rod hole.

8. The flow rate adjustable pneumatic control valve according to claim 7, characterized in that, Further comprising a valve core spring provided between the main body end plate and the bottom of the valve seat groove. The valve core spring is partially located in the insertion cavity, and both ends respectively contact the bottom of the valve seat groove and the bottom of the insertion cavity of the valve core assembly, and is in a compressed state.

9. The flow rate adjustable pneumatic control valve according to claim 1, characterized in that, Further comprising a dust cover, installed at the orifice of the valve body cavity, on the side where the piston rod extends out of the valve body cavity.

10. The flow rate adjustable pneumatic control valve according to claim 1, characterized in that, The adjusting member is a nut, installed on the side where the piston rod extends out of the valve body cavity.

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