Valve position indicating mechanism of check valve

Abstract

The utility model relates to the technical field of check valves, in particular to a check valve position indicating mechanism, a check valve comprises a valve body, a shaft rod, a valve clack assembly and an executing mechanism arranged on the outer side of the valve body, the shaft rod is rotatably connected with the valve body, the end portion of the shaft rod extends out of the valve body to be connected with the executing mechanism, and the valve clack assembly is located in the valve body and fixedly connected with the shaft rod. The valve position indicating device is characterized in that the valve position indicating mechanism comprises a first support, an indicating shaft and an indicating component, the first support is detachably connected with the outer side of the valve body, the indicating component is fixedly installed on the first support, one end of the indicating shaft is detachably connected with the shaft rod, and the other end of the indicating shaft penetrates through the first support to be connected with the input end of the indicating component. According to the steam extraction check valve, the indicating shaft is detachably connected with the shaft rod, the valve position indicating mechanism can be additionally arranged on the basis of an existing check valve structure, and the problem that an existing steam extraction check valve cannot synchronously feed back the actual opening angle of the valve clack assembly is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of check valves, in particular to a check valve position indicating mechanism. Background Art

[0002] In order to feedback the opening and closing position of the valve, the existing extraction steam check valve usually installs a circular indicator plate on the piston rod of the actuator. This structure can transmit the action signal of the actuator, but cannot provide real-time feedback on the action of the valve disc.

[0003] A travel switch plate and a travel switch are installed on the actuator, and the travel switch is triggered by the action of the indicator plate to transmit the action signal of the actuator. However, the existing travel switch structure can only feedback the opening and closing position of the actuator, but cannot feedback the opening and closing action of the valve disc, nor can it display the real-time opening position of the valve disc. For the existing steam extraction check valve, it is difficult for users to judge the actual opening angle of the valve;

[0004] When installing a valve position indicating mechanism on a check valve that has been put into use in a pipeline, the portion of the shaft extending out of the valve body is only sufficient to install a linkage assembly connected to the drive mechanism. Therefore, if the valve position indicating mechanism is to be installed, the shaft must be removed and replaced with a shaft of a suitable length before the installation can be completed. Therefore, it is urgent to design a check valve position indicating mechanism to solve the above problem. Utility Model Content

[0005] The utility model aims to provide a check valve position indicating mechanism, which solves the problem that the above-mentioned existing indicating structure cannot synchronously feedback the actual opening angle of the valve disc.

[0006] In order to solve the above technical problems, the utility model provides a check valve position indicating mechanism, the check valve comprises a valve body, a shaft, a valve flap assembly and an actuator arranged on the outside of the valve body, the shaft is rotatably connected to the valve body, and the end portion thereof extends out of the valve body and is connected to the actuator, the valve flap assembly is located in the valve body and fixedly connected to the shaft, the actuator is connected to the shaft, the valve position indicating mechanism comprises a first bracket, an indicating shaft and an indicating component, the first bracket is detachably connected to the outside of the valve body, the indicating component is fixedly mounted on the first bracket, one end of the indicating shaft is detachably connected to the shaft, and the other end passes through the first bracket and is connected to the input end of the indicating component.

[0007] Furthermore, the indicating shaft and the shaft rod are connected via threads.

[0008] Furthermore, an outer stud screwed with the shaft rod is fixed at one end of the indicating shaft, and a connecting column connected to the indicating component is fixed at the other end.

[0009] Furthermore, the indication shaft and the shaft rod are connected via an anti-rotation assembly, and the anti-rotation assembly includes an anti-rotation plate and a first limiting groove and a second limiting groove respectively arranged on opposite sides of the shaft rod and the indication shaft, the anti-rotation plate is Z-shaped, one end of the anti-rotation plate is embedded in the first limiting groove, and the other end is embedded in the second limiting groove, and a first through hole for the external stud to pass through is provided in the middle of the anti-rotation plate.

[0010] Furthermore, the first bracket is an L-shaped bracket consisting of a horizontal plate and a vertical plate fixed on the horizontal plate, the horizontal plate is fixed on the actuator, the indicating component is fixed on the vertical plate, the vertical plate has a second through hole, and the indicating shaft passes through the second through hole and is connected to the input end of the indicating component.

[0011] Furthermore, the indicating component includes a signal return device, and an input end of the signal return device cooperates with an end of the indicating shaft close to the first bracket.

[0012] Furthermore, the indicating component comprises a valve position sensor, which is a 4-20mA valve position sensor having a first pointer, and an input end of the valve position sensor cooperates with an end of the indicating shaft close to the first bracket.

[0013] Furthermore, the indicating component includes a second pointer and an angle indicating unit, one end of the second pointer is fixedly connected to the indicating shaft, and the other end constitutes the indicating end, the angle indicating unit is fixedly connected to the valve body, and the angle indicating unit includes a scale line arranged outside the valve body and used to indicate the rotation angle of the indicating end.

[0014] Furthermore, a position detection unit is fixedly provided on one side of the actuator, a trigger part is fixedly provided on the top of the output shaft of the actuator, the trigger part is a trigger plate, and the trigger part is used to trigger the detection point of the position detection unit, the position detection unit includes a second bracket, a first position detection switch and a second position detection switch, the second bracket and the first bracket are respectively fixedly provided on both sides of the actuator, the first position detection switch and the second position detection switch are fixedly provided on the second bracket, and are respectively provided on both sides of the trigger plate.

[0015] Furthermore, the indicating shaft is a heat insulating member.

[0016] The beneficial effects of the utility model are as follows: the valve position indicating mechanism of the utility model rotates synchronously with the valve flap assembly through the indicating shaft, and the indicating component is installed on the cylinder body of the actuator through a bracket, the structure is simple, the indicating shaft can be installed on the input end of the shaft rod and the actuator, and the other end of the shaft rod does not need to extend out of the valve body to connect the valve position indicating mechanism, thereby reducing the risk of valve body leakage; at the same time, the valve position indicating mechanism of the utility model can be installed on the basis of the existing check valve structure through the detachable connection between the indicating shaft and the shaft rod, thereby solving the problem that the existing steam extraction check valve cannot synchronously feedback the actual opening angle of the valve flap assembly;

[0017] The first bracket is detachably connected to the valve body or the actuator, and the other end of the indicating shaft passes through the first bracket and is detachably connected to the indicating component, thereby meeting the installation requirements of different indicating components;

[0018] The indicating shaft is connected to the shaft rod through an anti-rotation assembly, and the outer stud of the indicating shaft passes through the anti-rotation sheet of the anti-rotation assembly and is connected to the shaft rod. The anti-rotation sheet is Z-shaped, one end of which is matched with the first limiting groove on the shaft rod, and the other end is matched with the second limiting groove on the indicating shaft, thereby effectively preventing the indicating shaft and the shaft rod from rotating in the opposite direction, preventing the indicating shaft from falling off and causing the valve indicating mechanism to be damaged, and also preventing the indicating shaft from loosening and causing the valve indicating mechanism to indicate inaccurately;

[0019] Compared with using a shaft rod with better heat transfer effect to directly connect with the indicating component, the present application uses an indicating shaft with heat insulation function to connect with the indicating component, which reduces the damage of the high-temperature medium in the valve body to the indicating component. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a right side view of a check valve position indicating mechanism with a feedback device installed in one embodiment of the utility model;

[0022] Figure 2 It is a partially enlarged front view of a check valve position indicating mechanism installed with a feedback device in one embodiment of the utility model;

[0023] Figure 3 It is a right side view of a check valve position indicating mechanism installed with a valve position sensor in another embodiment of the utility model;

[0024] Figure 4It is a partial front view of a check valve position indicating mechanism installed with a valve position sensor in another embodiment of the utility model;

[0025] Figure 5 It is a partial enlarged front view of a check valve position indicating mechanism installed with a valve position sensor in another embodiment of the utility model;

[0026] Figure 6 It is a structural diagram of a check valve position indicating mechanism equipped with a valve position sensor in another embodiment of the utility model;

[0027] Figure 7 It is a right side view of a check valve position indicating mechanism installed with a second pointer and an angle indicating unit in yet another embodiment of the utility model;

[0028] In the figure: 1-valve body, 2-shaft, 3-valve disc assembly, 4-actuator, 5-linkage assembly, 6-valve position indicating mechanism, 7-limiting member, 8-anti-rotation assembly, 9-position detection unit, 10-trigger part, 21-first limiting groove, 41-output shaft, 61-first bracket, 62-indicating shaft, 63-indicating component, 81-anti-rotation sheet, 91-second bracket, 92-first position detection switch, 93-second position detection switch, 621-external stud, 622-connecting column, 623-second limiting groove, 631-first pointer, 632-second pointer, 633-angle indicating unit. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings of the utility model specification to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In a specific embodiment of the present invention, Figure 1-7As shown, a check valve position indicating mechanism is specifically disclosed. The check valve comprises a valve body 1, a shaft 2, a valve flap assembly and an actuator 4 arranged on the outside of the valve body 1. The shaft 2 is rotatably connected to the valve body 1, and its end extends out of the valve body 1 and is connected to the actuator 4. The valve flap assembly is located in the valve body 1 and is fixedly connected to the shaft 2. The actuator 4 is connected to the shaft 2 through a linkage assembly 5. The linkage assembly 5 is preferably a rotating rod. One end of the rotating rod has an open groove. The output shaft 41 of the actuator 4 passes through the open groove. A limit nut located on the upper side of the open groove is fixed on the output shaft 41. The other end of the rotating rod is fixedly sleeved on the shaft 2. The actuator 4 is a cylinder drive device. The valve position indicating mechanism 6 comprises a first bracket 61, an indicating shaft 62 and an indicating component 63. The indicating shaft 62 is a heat insulating member. The heat insulating member has a heat dissipation groove or the heat insulating member is provided with the heat dissipation groove. The heat piece is made of hard heat-insulating material. Compared with the shaft 2 with better heat transfer effect directly connected to the indicating component 63, the present application adopts the indicating shaft 62 with heat insulation function to connect with the indicating component 63, which reduces the damage of the high-temperature medium in the valve body 1 to the indicating component 63. The first bracket 61 is detachably connected to the outer side of the valve body 1, and the indicating component 63 is fixedly mounted on the first bracket 61. Preferably, the first bracket 61 is an L-shaped bracket composed of a horizontal plate and a vertical plate fixed on the horizontal plate. The horizontal plate is fixedly mounted on the cylinder body of the cylinder drive device by bolts. The indicating component 63 is fixed on the vertical plate. The vertical plate has a second through hole. The indicating shaft 62 passes through the second through hole and is connected to the input end of the indicating component 63. One end of the indicating shaft 62 is detachably connected to the shaft 2, and the other end passes through the first bracket 61 and is connected to the input end of the indicating component 63. Preferably, the indicating shaft 62 and the shaft 2 are connected by threads.

[0031] An outer stud 621 screwed with the shaft rod 2 is fixed at one end of the indicating shaft 62 , and a connecting column 622 connected to the indicating component 63 is fixed at the other end.

[0032] The indicating shaft 62 is connected to the shaft rod 2 through an anti-rotation assembly 8, which includes an anti-rotation sheet 81 and a first limiting groove 21 and a second limiting groove 623 respectively arranged on opposite sides of the shaft rod 2 and the indicating shaft 62. The anti-rotation sheet 81 is Z-shaped, one end of the anti-rotation sheet 81 is embedded in the first limiting groove 21, and the other end is embedded in the second limiting groove 623. A first through hole is provided in the middle of the anti-rotation sheet 81 for the outer stud 621 to pass through.

[0033] According to one embodiment of the utility model, the indicating component 63 includes a signal return device, the input end of the signal return device cooperates with the end of the indicating shaft 62 close to the first bracket 61, and a card slot for inserting the input end of the signal return device is provided in the connecting column 622 of the indicating shaft 62. The card slot can be processed into an optical slot, a threaded slot, or a limit slot, depending on actual usage requirements.

[0034] According to another embodiment of the utility model, the indicating component 63 includes a valve position sensor, which is a 4-20mA valve position sensor having a first pointer 631. The input end of the valve position sensor cooperates with one end of the indicating shaft 62 close to the first bracket 61. One end of the first pointer 631 is fixedly mounted on the indicating shaft 62, and the other end cooperates with the sensing point in the valve position sensor for indication.

[0035] According to another embodiment of the utility model, the indicating component 63 includes a second pointer 632 and an angle indicating unit 633, one end of the second pointer 632 is fixedly connected to the indicating shaft 62, and the other end constitutes the indicating end, a limit member 7 is provided on the outer side of the second pointer 632, and the limit member 7 is inserted in the slot at the end of the connecting column 622 of the indicating shaft 62, the angle indicating unit 633 is fixedly connected to the valve body 1, and the angle indicating unit 633 includes scale lines arranged outside the valve body 1 and used to indicate the rotation angle of the indicating end, the scale lines are preferably angle scale lines, and a plurality of angle lines are arranged on the angle scale lines, and the starting scale line of the angle line is the angle when the valve flap assembly is fully closed, and the ending scale line is the angle when the valve flap assembly is fully open.

[0036] A position detection unit 9 is fixedly provided on one side of the actuator 4 , and a trigger part 10 is fixedly provided on the top of the output shaft 41 of the actuator 4 . The trigger part 10 is a trigger plate and is used to trigger the detection point of the position detection unit 9 .

[0037] The position detection unit 9 includes a second bracket 91, a first position detection switch 92 and a second position detection switch 93. The second bracket 91 and the first bracket 61 are respectively fixedly arranged on both sides of the actuator 4. The first position detection switch 92 and the second position detection switch 93 are fixedly arranged on the second bracket 91, and are respectively arranged on both sides of the trigger plate. In this embodiment, the first position detection switch 92 and the second position detection switch 93 are limit switches, which can be respectively arranged above and below the trigger plate, or can be proximity switches, which are arranged on the upper and lower sides or left and right sides of the trigger plate.

[0038] The workflow of this utility model:

[0039] The process of adding a valve position indicating mechanism to a check valve in normal use is as follows: install the first bracket 61 on the body of the actuator 4, fix the actuator 4 to the outer wall of the valve body 1 below the shaft 2, fix one end of the rotating rod to the shaft 2, and sleeve the other end on the output shaft 41 of the actuator 4, and install a trigger part 10 at the end of the output shaft 41, install the second bracket 91 to one side of the output shaft 41 of the actuator 4, and be located on one side of the trigger part 10, and measure the positions of the first position detection switch 92 and the second position detection switch 93 on the second bracket 91, and install the two on the second bracket 91, so that the indicating end of the trigger part 10 is located between the first position detection switch 92 and the second position detection switch 93;

[0040] The anti-rotation plate 81 is initially a straight plate. The middle part of the anti-rotation plate 81 is flush with the end of the shaft 2, and one end is bent and placed in the first limiting groove 21 on the shaft 2. The outer stud 621 at the end of the indicating shaft 62 passes through the first through hole on the anti-rotation plate 81 and continues to be screwed into the end of the shaft 2. The other end of the anti-rotation plate 81 is bent and placed in the second limiting groove 623 on the indicating shaft 62. The connecting column 622 of the indicating shaft 62 passes through the first through hole on the first bracket 61 and extends out. The indicating component 63 is installed on the extended connecting column 622 of the indicating shaft 62, and it is fixed to the first bracket 61 by fasteners, thereby completing the installation work, thereby solving the problem that the existing check valve cannot be equipped with a valve position indicating mechanism, and at the same time can also meet the installation conditions of various valve position indicating mechanisms.

[0041] After the installation is completed, the normal working process of the check valve is:

[0042] The output shaft 41 of the actuator 4 rises upward or retracts downward, and the trigger part 10 at the upper end of the output shaft 41 senses the second position detection switch 93 or the first position detection switch 92, and the second position detection switch 93 or the first position detection switch 92 sends the sensing signal to the control unit connected thereto, so that the monitoring room can obtain the lifting and lowering conditions of the actuator 4.

[0043] The output shaft 41 of the actuator 4 rises upward, and the limit nut no longer limits the rotating rod, and the end of the rotating rod away from the shaft 2 can move up and down relative to the output shaft 41. When the medium passes through, the medium pushes the valve flap assembly to open, or when the medium flow rate decreases, the valve flap assembly drives the valve flap assembly to close by its own weight, thereby driving the shaft 2 and the input end of the feedback device (here the feedback device can be replaced by the first pointer 631 of the valve position sensor or the second pointer 632 of the indicating component 63) to rotate synchronously, so that the valve flap assembly fits or separates from the valve seat of the valve body 1. At the same time, the feedback device or the valve position sensor sends the sensing signal to the control unit connected to the two, and the control unit sends the feedback data and the detection data to the monitoring room, so that the opening and opening and closing conditions of the valve flap assembly can be understood in real time, which effectively solves the problem that the existing indicating structure cannot synchronously feedback the actual opening angle of the valve flap assembly.

[0044] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A check valve position indicating mechanism, the check valve comprising a valve body (1), a shaft (2), a valve flap assembly and an actuator (4) arranged outside the valve body (1), the shaft (2) being rotatably connected to the valve body (1), and an end of the shaft (2) extending out of the valve body (1) and connected to the actuator (4), the valve flap assembly being located inside the valve body (1) and fixedly connected to the shaft (2), and the actuator (4) being connected to the shaft (2), characterized in that: The valve position indicating mechanism (6) comprises a first bracket (61), an indicating shaft (62) and an indicating component (63); the first bracket (61) is detachably connected to the outer side of the valve body (1); the indicating component (63) is fixedly mounted on the first bracket (61); one end of the indicating shaft (62) is detachably connected to the shaft rod (2); and the other end passes through the first bracket (61) and is connected to an input end of the indicating component (63).

2. A check valve position indicating mechanism according to claim 1, characterized in that: The indicating shaft (62) is connected to the shaft rod (2) via threads.

3. A check valve position indicating mechanism according to claim 2, characterized in that: An outer stud (621) screwed with the shaft (2) is fixed to one end of the indicating shaft (62), and a connecting column (622) connected to the indicating component (63) is fixed to the other end.

4. A check valve position indicating mechanism according to claim 3, characterized in that: The indicating shaft (62) is connected to the shaft rod (2) via an anti-rotation assembly (8), the anti-rotation assembly (8) comprising an anti-rotation plate (81) and a first limiting groove (21) and a second limiting groove (623) respectively arranged on opposite sides of the shaft rod (2) and the indicating shaft (62), the anti-rotation plate (81) being Z-shaped, one end of the anti-rotation plate (81) being embedded in the first limiting groove (21), and the other end being embedded in the second limiting groove (623), and a first through hole for the outer stud (621) to pass through is provided in the middle of the anti-rotation plate (81).

5. A check valve position indicating mechanism according to claim 1, characterized in that: The first bracket (61) is an L-shaped bracket consisting of a transverse plate and a longitudinal plate fixed on the transverse plate, the transverse plate is fixed on the actuator (4), the indicating component (63) is fixed on the longitudinal plate, the longitudinal plate has a second through hole, and the indicating shaft (62) passes through the second through hole and is connected to the input end of the indicating component (63).

6. A check valve position indicating mechanism according to claim 1, characterized in that: The indicating component (63) comprises a signal returner, and an input end of the signal returner cooperates with an end of the indicating shaft (62) close to the first bracket (61).

7. A check valve position indicating mechanism according to claim 1, characterized in that: The indicating component (63) comprises a valve position sensor, which is a 4-20mA valve position sensor having a first pointer (631), and an input end of the valve position sensor cooperates with an end of the indicating shaft (62) close to the first bracket (61).

8. A check valve position indicating mechanism according to claim 1, characterized in that: The indicating component (63) comprises a second pointer (632) and an angle indicating unit (633), one end of the second pointer (632) is fixedly connected to the indicating shaft (62), and the other end constitutes an indicating end, the angle indicating unit (633) is fixedly connected to the valve body (1), and the angle indicating unit (633) comprises a scale line arranged outside the valve body (1) and used to indicate the rotation angle of the indicating end.

9. A check valve position indicating mechanism according to claim 1, characterized in that: A position detection unit (9) is fixedly arranged on one side of the actuator (4); a trigger portion (10) is fixedly arranged on the top of the output shaft (41) of the actuator (4); the trigger portion (10) is a trigger plate; the trigger portion (10) is used to trigger a detection point of the position detection unit (9); the position detection unit (9) comprises a second bracket (91), a first position detection switch (92) and a second position detection switch (93); the second bracket (91) and the first bracket (61) are fixedly arranged on both sides of the actuator (4), respectively; the first position detection switch (92) and the second position detection switch (93) are fixedly arranged on the second bracket (91) and are respectively arranged on both sides of the trigger plate.

10. A check valve position indicating mechanism according to claim 1, characterized in that: The indicating shaft (62) is a heat insulating member.

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