A device for freely adjusting flow rate of valve positioner

Abstract

The present invention discloses a device for a valve positioner with freely adjustable flow rate, comprising: a device body, a first air inlet, a first air outlet, and a throttle rod opening are provided on the surface of the device body, a first air channel connected with the first air outlet and the first air inlet, and a throttle rod channel matched with the throttle rod opening are respectively provided inside the device body, the throttle rod channel is cross-connected with the first air channel, and a connecting port is provided at the cross-connection between the throttle rod channel and the first air channel. The present invention arranges a throttle rod in the throttle rod channel of the device body, a blocking part and a first through hole part are provided on the side surface of the top of the throttle rod, and a second through hole part is provided on the top of the throttle rod, so as to achieve the effect of adjusting the flow rate of the output air source of the valve positioner through the throttle rod through the through hole part and the blocking part.

Description

Technical Field

[0001] The invention relates to the technical field of valve positioners, in particular to a device capable of freely adjusting flow rate for a valve positioner. Background Art

[0002] The valve positioner is the main accessory of the control valve. It uses the valve stem displacement signal as the input feedback measurement signal and the controller output signal as the setting signal for comparison. When there is a deviation between the two, it changes the output signal to the actuator to make the actuator move, thus establishing a one-to-one correspondence between the valve stem displacement and the controller output signal. Therefore, the valve positioner constitutes a feedback control system with the valve stem displacement as the measurement signal and the controller output as the setting signal. The manipulated variable of this control system is the output signal of the valve positioner to the actuator action change.

[0003] Since the electrical conversion module of the valve positioner cannot be directly connected to the air pipe joint, a conversion device is required for connection. The conversion device of the pressure gauge module is a device that is connected to the electrical conversion module of the valve positioner and converts the output and input gas sources of the electrical conversion module to devices that can be connected to the air pipe joint. In the prior art, some of these devices have no throttling structure, while others have throttling structures. Those without throttling structures generally use an external throttling plate for throttling, and the valve positioner pressure gauge module with a throttling structure usually uses a conical throttling rod structure for throttling. In actual use, the method of adding a throttling plate is cumbersome to operate and can only have a fixed flow rate. However, the conical throttling structure cannot effectively adjust the flow rate freely, and since it is mostly fixed by threaded connection, the threads are very easy to get stuck when used for a long time in a more complex outdoor environment, resulting in the problem of being unusable. Summary of the invention

[0004] The object of the present invention is to provide a device for a valve positioner with a freely adjustable flow rate, so as to solve the problem raised in the above-mentioned background technology: in the prior art, some of such devices do not have a throttling structure, while others have a throttling structure. The devices without a throttling structure generally adopt an external throttling plate for throttling, while the valve positioner pressure gauge module with a throttling structure generally adopts a conical throttling rod structure for throttling. In actual use, the method of adding a throttling plate is cumbersome to operate and can only achieve a fixed flow rate. However, the conical throttling structure cannot effectively perform free adjustment and control of the flow rate. Moreover, since a threaded connection and fixing method is mostly adopted, the threads are very likely to get stuck when used for a long time in a relatively complex outdoor environment, resulting in the problem that the throttling cannot be used.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a device for a valve positioner capable of freely adjusting flow, comprising: a device body, a first air inlet, a first air outlet, and a throttle rod opening are provided on the surface of the device body, a first air channel connecting the first air outlet and the first air inlet, and a throttle rod channel matching and communicating with the throttle rod opening are respectively provided inside the device body, the throttle rod channel is cross-connected with the first air channel, and a connecting port is provided at the cross-connection between the throttle rod channel and the first air channel;

[0006] A throttle rod, the throttle rod is arranged in the throttle rod channel, the throttle rod is a cylindrical rod body, a first groove is arranged on the surface of the throttle rod, a sealing ring is arranged in the first groove, the sealing ring is sealed and connected with the inner wall of the throttle rod channel, a blocking part and a first through hole part are arranged on the top side of the throttle rod, a second through hole part is arranged on the top of the throttle rod, the first through hole part is connected with the second through hole part, the first air inlet and the first air outlet, the blocking part and the first through hole part are arranged at the position where the connecting port is located, the blocking part is used to block the connecting port, and the first through hole part is used to connect the connecting port.

[0007] Preferably, a limiting hole opening is further provided on the surface of the device body, and a limiting hole channel matching and communicating with the limiting hole opening is provided inside the device body, and the limiting hole channel is connected with a screw via a thread.

[0008] Preferably, a second groove is further provided on the surface of the throttle rod, and the second groove is arranged at the position where the limiting hole channel is located, and the top end of the screw passes through the limiting hole channel and is clamped in the second groove.

[0009] Preferably, a second air inlet and a second air outlet are further provided on the surface of the device body, and a second air passage connecting the second air inlet and the second air outlet is provided inside the device body.

[0010] Preferably, a first pressure gauge interface and a second pressure gauge interface are also provided on the surface of the device body, the first pressure gauge interface is connected to the first airway, and the second pressure gauge interface is connected to the second airway.

[0011] Preferably, the first air outlet, the second air inlet, the first pressure gauge interface and the second pressure gauge interface are all provided with threads for threaded connection.

[0012] Preferably, the bottom end surface of the throttle rod is provided with a third groove for adjusting the position of the blocking portion and the first through hole portion, and the third groove is exposed to the outer surface of the device body through the throttle rod opening.

[0013] Preferably, a mark for identifying the state of the throttle lever is provided above the throttle lever opening, and when the relative position of the mark and the third groove changes, the state of the throttle lever also changes.

[0014] Preferably, the device body is also provided with a mounting hole for fixing and installing the device body, and there are two or more mounting holes.

[0015] Preferably, a gap is provided between the outer side wall of the throttle rod and the inner side wall of the throttle rod channel, and the gap is between 0.08 mm and 0.12 mm.

[0016] Compared with the prior art, the device for freely adjusting flow rate of a valve positioner disclosed in the present invention has the following beneficial effects:

[0017] 1. A blocking portion and a first through-hole portion are provided on the top side of the throttle rod, a second through-hole portion is provided on the top end of the throttle rod, the first through-hole portion is connected with the second through-hole portion, the first air inlet and the first air outlet, the blocking portion and the first through-hole portion are provided at the position where the connecting port is located, when it is necessary to block the connecting port, the throttle rod is rotated so that the blocking portion on the top side of the throttle rod is rotated to the connecting port, and the blocking portion slowly blocks the connecting port, and when it is necessary to connect the connecting port with the first air passage, the first through-hole portion on the top side of the throttle rod is rotated to the connecting port, and as the throttle rod rotates, the first through-hole portion slowly connects the connecting port with the first air passage, and the throttle rod is rotated so that the blocking portion and the first connecting portion on the top side of the throttle rod respectively block and connect the connecting port, and the blocking portion and the first connecting portion can completely block and connect the connecting port, thereby achieving a better throttling effect and a complete throttling effect.

[0018] 2. A first groove is provided on the surface of the throttle rod, a sealing ring is provided in the first groove, and the sealing ring is sealed and connected to the inner wall of the throttle rod channel, thereby effectively preventing gas or liquid from flowing out of the throttle rod channel, making the throttle rod channel completely sealed and having better sealing performance.

[0019] 3. A second groove is provided on the surface of the throttle rod, and the second groove is provided at the position of the limiting hole channel. The top end of the screw passes through the limiting hole channel and is clamped in the second groove. The throttle rod is supported by the top end of the screw, thereby effectively fixing the position of the throttle rod without affecting the rotational movement of the throttle rod. This structure is not easy to get stuck when used for a long time in a more complex outdoor environment, and effectively prevents the throttle rod from falling off under the impact of ultra-high pressure.

[0020] 4. A mark for identifying the state of the throttle lever is provided above the throttle lever opening. When the relative position of the mark and the third groove changes, the state of the throttle lever also changes. The current rotation state of the throttle lever can be identified by the mark, thereby identifying the current throttling state, which makes it more convenient and quick for users to use.

[0021] 5. By setting a gap between the outer wall of the throttle rod and the inner wall of the throttle rod channel, the gap is between 0.08mm-0.12mm, so that the friction between the outer wall of the throttle rod and the inner wall of the throttle rod channel is smaller, and rotation is more convenient. At the same time, there is a certain gap between the blocking part of the throttle rod and the connecting port, and the connecting port is not completely blocked. In an ultra-high pressure environment, a small amount of air pressure can pass through the gap, thereby preventing the throttle rod from being displaced or damaged due to long-term use in an extreme high-pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the internal structure of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of the device body of the present invention;

[0024] Figure 3 This is a schematic diagram of the throttle rod structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection between the throttle rod and the screw of the present invention;

[0026] Figure 5 This is a schematic diagram of the third groove structure of the present invention;

[0027] Figure 6 It is a three-dimensional schematic diagram of the front structure of the present invention;

[0028] Figure 7 It is a three-dimensional schematic diagram of the back structure of the present invention;

[0029] Figure 8 It is a three-dimensional schematic diagram of the top surface structure of the present invention;

[0030] Fig. 9 It is a three-dimensional schematic diagram of the side structure of the present invention;

[0031] Fig.10 It is a schematic diagram of the side planing line of the present invention;

[0032] Fig.11 The present invention is based on Fig.10 Schematic diagram of the sliced ​​part formed by the sliced ​​line.

[0033] In the figure:

[0034] 10. Device body; 20. First air passage; 30. Throttle rod passage; 40. Limit hole passage; 50. Communication port; 60. Throttle rod; 70. Screw; 80. Second air passage; 90. Mark; 110. Mounting hole;

[0035] 101, first air inlet; 102, first air outlet; 103, throttle lever opening; 104, limit hole opening; 105, second air inlet; 106, second air outlet; 107, first pressure gauge interface; 108, second pressure gauge interface;

[0036] 601, first groove; 602, second groove; 603, sealing ring; 604, blocking portion; 605, first through hole portion; 606, second through hole portion; 607, third groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] See also Figures 1 to 11 In the embodiment of the present invention, the device comprises: a device body 10, a first air inlet 101, a first air outlet 102, and a throttle rod opening 103 are provided on the surface of the device body 10, a first air passage 20 connecting the first air outlet 102 and the first air inlet 101, and a throttle rod passage 30 matching and connecting with the throttle rod opening 103 are respectively provided inside the device body 10, the throttle rod passage 30 is cross-connected with the first air passage 20, and a connecting port 50 is provided at the cross-connection between the throttle rod passage 30 and the first air passage 20;

[0040] like Figure 3-Figure 5As shown, in the embodiment of the present invention, it also includes: a throttle rod 60, the throttle rod 60 is arranged in the throttle rod channel 30, the throttle rod 60 is a cylindrical rod body, a first groove 601 is arranged on the surface of the throttle rod 60, a sealing ring 603 is arranged in the first groove 601, and the sealing ring 603 is sealed and connected with the inner side wall of the throttle rod channel 30. The sealing ring 603 arranged here effectively prevents gas or liquid from flowing out of the throttle rod channel 30, so that the throttle rod channel 330 is completely sealed, and the sealing performance is better;

[0041] Further, a blocking portion 604 and a first through hole portion 605 are provided on the top side of the throttle rod 60, a second through hole portion 606 is provided on the top of the throttle rod 60, the first through hole portion 605 is connected with the second through hole portion 606, the first air inlet 101, and the first air outlet 102, the blocking portion 604 and the first through hole portion 605 are provided at the position where the communication port 50 is located, the blocking portion 604 is used to block the communication port 50, and the first through hole portion 605 is used to connect the communication port 50;

[0042] Further, refer to Figure 5 The bottom end surface of the throttle rod 60 is provided with a third groove 607 for adjusting the position of the blocking portion 604 and the first through hole portion 605. The third groove 607 is exposed to the outer surface of the device body 10 through the throttle rod opening 103. When in use, the third groove 607 is clamped by an external flat screwdriver. When the flat screwdriver is rotated, the throttle rod 60 follows the flat screwdriver to rotate, thereby driving the blocking portion 604 and the first through hole portion 605 set on the top side of the throttle rod 60 to rotate. When the blocking portion 604 rotates to the connecting port 50, the blocking portion 604 blocks the connecting port 50, so that The connecting port 50 is closed. When the first through hole portion 605 rotates to the connecting port 50, the first through hole portion 605 connects the connecting port 50 with the second through hole portion 606, thereby connecting the first through hole portion 605 with the second through hole portion 606, the first air inlet 101, and the first air outlet 102. The second through hole portion 606 is arranged at the top of the throttle rod 60, so that the throttle rod channel 30 and the first air channel 20 are connected in a straight line. The fluid flowing down from the connecting port 50 flows directly from the throttle rod channel 30 to the first air channel 20 in a straight line, and the fluid is smoother. In summary, a better throttling effect and a complete throttling effect are achieved.

[0043] like Figure 1-Figure 2 As shown, the surface of the device body 10 is also provided with a limit hole opening 104, and the device body 10 is provided with a limit hole channel 40 that matches and communicates with the limit hole opening 104. The limit hole channel 40 is connected to the screw 70 through a thread. Figure 4 , Fig.10 , Fig.11 As shown, Fig.11 Based on Fig.10The planed surface structure is planed by the planing line A in the drawing, wherein the surface of the throttle rod 60 is further provided with a second groove 602, and the second groove 602 is arranged at the position where the limiting hole channel 40 is located. The top end of the screw 70 passes through the limiting hole channel 40 and is clamped in the second groove 602, so as to effectively fix the position of the throttle rod without affecting the rotational movement of the throttle rod. The screw connection method is adopted to make the screw 70 more secure and not easy to fall off, and at the same time effectively prevent the throttle rod from falling off under the impact of ultra-high pressure.

[0044] like Figure 1 , Figure 2 , Fig. 9 , Fig.10 As shown, the bottom end surface of the throttle rod 60 is provided with a third groove 607 for adjusting the position of the blocking portion 604 and the first through-hole portion 605. The third groove 607 is exposed to the outer surface of the device body 10 through the throttle rod opening 103. A mark 90 for identifying the state of the throttle rod 60 is provided above the throttle rod opening 103. When the relative position of the mark 90 and the third groove 607 changes, the state of the throttle rod 60 also changes. When the third groove 607 is now in a vertical state with respect to the mark 90, the blocking portion 604 blocks the connecting port 50 to close the connecting port 50. When the third groove 607 is now in a horizontal state with respect to the mark 90, the connecting port 50 is connected with the second through-hole portion 606. The current rotation state of the throttle rod 60 is identified by the mark 90, thereby identifying the current throttling state. The user can identify the current throttling state more conveniently and quickly when using it.

[0045] like Figure 1 , Figure 2 , Figure 6-Figure 9 As shown, the device body 10 is further provided with a mounting hole 110 for fixing and installing the device body 10, and two or more mounting holes 110 are provided. More preferably, one mounting hole 110 is provided at the lower left corner of the device body 10, and the other is provided at the upper right corner of the device body 10, and the mounting holes are used to fix the device body 10 on the external electric valve positioner;

[0046] Furthermore, a second air inlet 105 and a second air outlet 106 are also provided on the surface of the device body 10, and a second air passage 80 connecting the second air inlet 105 and the second air outlet 106 is provided inside the device body 10;

[0047] The surface of the device body 10 is also provided with a first pressure gauge interface 107 and a second pressure gauge interface 108, wherein the first pressure gauge interface 107 is communicated with the first air channel 20, and the second pressure gauge interface 108 is communicated with the second air channel 80, wherein the first air outlet 102, the second air inlet 105, the first pressure gauge interface 107, and the second pressure gauge interface 108 are all provided with threads for threaded connection, the first pressure gauge interface 107 and the second pressure gauge interface 108 are threadedly connected to an external pressure gauge, and the first air outlet 102 and the second air inlet 105 are threadedly connected to an external air pipe;

[0048] Furthermore, a gap is provided between the outer wall of the throttle rod 60 and the inner wall of the throttle rod channel 30, and the gap is between 0.08mm and 0.12mm. By providing the gap, the friction between the outer wall of the throttle rod 60 and the inner wall of the throttle rod channel 30 is smaller, and rotation is more convenient. At the same time, there is a certain gap between the blocking portion 604 of the throttle rod 60 and the connecting port 50, so that the blocking portion 604 does not completely block the connecting port 50. In an ultra-high pressure environment, a small amount of air pressure can pass through the gap, thereby preventing the throttle rod 60 from shifting or being damaged due to long-term use in the extremely high pressure environment.

[0049] When the present invention is actually used, the device body 10 is installed on the external electric valve positioner through the installation hole 110, and the first pressure gauge interface 107 and the second pressure gauge interface 108 are connected to the external pressure gauge through threads, the first air outlet 102 and the second air inlet 105 are connected to the external air pipe through threads, and the first air inlet 101 and the second air outlet 106 are connected to the electrical conversion module of the external electric valve positioner. The gas or liquid flows in from the second air inlet 105, passes through the second air duct 80, and flows from the second air outlet 106 to the electrical conversion module. Block, the gas or liquid after passing through the electrical conversion module flows in from the first air inlet 101, and flows out from the first air outlet 102 through the first air duct 20. When throttling is required, the third groove 607 is clamped by an external screwdriver and rotated to make the third groove 607 rotate to a certain position relative to the mark 90, thereby driving the blocking part 604 to block the connecting port 50 and close the connecting port 50, or the first through hole part 605 is rotated to the connecting port 50, and the first through hole part 605 connects the connecting port 50 with the second through hole part 606, thereby achieving the throttling effect.

[0050] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A device for freely adjusting flow rate of a valve positioner, characterized in that: include: A device body (10), wherein a first air inlet (101), a first air outlet (102), and a throttle rod opening (103) are provided on the surface of the device body (10); a first air passage (20) connecting the first air outlet (102) and the first air inlet (101) and a throttle rod passage (30) matching and connected with the throttle rod opening (103) are provided inside the device body (10); the throttle rod passage (30) and the first air passage (20) are cross-connected, and a connecting port (50) is provided at the cross-connection between the throttle rod passage (30) and the first air passage (20); A throttle rod (60), the throttle rod (60) being arranged in the throttle rod channel (30), the throttle rod (60) being a cylindrical rod body, the surface of the throttle rod (60) being provided with a first groove (601), the first groove (601) being provided with a sealing ring (603), the sealing ring (603) being sealedly connected to the inner side wall of the throttle rod channel (30), the top side of the throttle rod (60) being provided with a blocking portion (604) and a first through hole portion (605), the A second through hole portion (606) is provided at the top end of the throttle rod (60); the first through hole portion (605) is in communication with the second through hole portion (606), the first air inlet (101), and the first air outlet (102); the blocking portion (604) and the first through hole portion (605) are provided at the location where the communication port (50) is located; the blocking portion (604) is used to block the communication port (50); and the first through hole portion (605) is used to communicate with the communication port (50); A second air inlet (105) and a second air outlet (106) are also provided on the surface of the device body (10), and a second air passage (80) communicating with the second air inlet (105) and the second air outlet (106) is provided inside the device body (10); The first air inlet (101) and the second air outlet (106) are connected to an electrical conversion module of an external electrical valve positioner; gas or liquid flows in from the second air inlet (105), passes through the second air channel (80), and flows from the second air outlet (106) to the electrical conversion module; the gas or liquid after passing through the electrical conversion module flows in from the first air inlet (101), passes through the first air channel (20), and flows out from the first air outlet (102); A gap is provided between the outer side wall of the throttle rod (60) and the inner side wall of the throttle rod channel (30), and the gap is between 0.08 mm and 0.12 mm.

2. A device for freely adjusting flow rate of a valve positioner according to claim 1, characterized in that: A limit hole opening (104) is also provided on the surface of the device body (10), and a limit hole channel (40) matching and communicating with the limit hole opening (104) is provided inside the device body (10), and the limit hole channel (40) is connected to the screw (70) via a thread.

3. A device for freely adjusting flow rate of a valve positioner according to claim 2, characterized in that: The surface of the throttle rod (60) is also provided with a second groove (602), and the second groove (602) is arranged at the position where the limiting hole channel (40) is located, and the top end of the screw (70) passes through the limiting hole channel (40) and is clamped in the second groove (602).

4. A device for freely adjusting flow rate of a valve positioner according to claim 1, characterized in that: A first pressure gauge interface (107) and a second pressure gauge interface (108) are also provided on the surface of the device body (10); the first pressure gauge interface (107) is connected to the first air channel (20), and the second pressure gauge interface (108) is connected to the second air channel (80).

5. A device for freely adjusting flow rate of a valve positioner according to claim 4, characterized in that: The first air outlet (102), the second air inlet (105), the first pressure gauge interface (107), and the second pressure gauge interface (108) are all provided with threads for threaded connection.

6. A device for freely adjusting flow rate of a valve positioner according to claim 1, characterized in that: The bottom end surface of the throttle rod (60) is provided with a third groove (607) for adjusting the position of the blocking portion (604) and the first through hole portion (605); the third groove (607) is exposed to the outer surface of the device body (10) through the throttle rod opening (103).

7. A device for freely adjusting flow rate of a valve positioner according to claim 6, characterized in that: A mark (90) for identifying the state of the throttle lever (60) is provided above the throttle lever opening (103); when the relative position of the mark (90) and the third groove (607) changes, the state of the throttle lever (60) also changes.

8. A device for freely adjusting flow rate of a valve positioner according to any one of claims 1 to 7, characterized in that: The device body (10) is also provided with a mounting hole (110) for fixing and installing the device body (10), and two or more mounting holes (110) are provided.

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