Control valve for differential pressure transmitter

Abstract

The utility model discloses a control valve for a differential pressure transmitter, and belongs to the technical field of control valves. A control valve is installed on the differential pressure transmitter and comprises a valve rod, a threaded rod is fixed to the top end of the valve rod, an installation plate is arranged on the control valve, the threaded rod is arranged in the installation plate, a protection frame is installed on the top face of the installation plate, a protection plate is matched with the protection frame, and a motor is installed in the installation plate. The control valve is mounted in the butt joint pipe, the differential pressure transmitter and the control valve are provided with the mounting plates, and the cylinder at the bottom end of the driven gear is connected with the second bearing to rotate, so that the valve rod at the bottom end of the second bearing can drive the valve block to rotate in the butt joint pipe, and automatic control is achieved; a threaded rod at the bottom end of the rotating handle can be connected with the valve rod to rotate in a first bearing in a first circular ring, and manual rotation of a valve block on the valve rod in a butt joint pipe is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a control valve for a differential pressure transmitter. Background Art

[0002] The differential pressure transmitter is a typical self-balancing detection instrument. It is a device used to measure the liquid level, flow and pressure of liquid, gas or steam. Differential pressure transmitters and pressure transmitters are commonly used sensor devices in industrial process control, but there are obvious differences between the two. The differential pressure transmitter is mainly used to measure the differential pressure in the fluid and calculate the flow rate or liquid level through the differential pressure value. The differential pressure transmitter requires a stable flow input during operation and ensures its flow output by installing a control valve.

[0003] During use, water flow will corrode some mechanical components and cause them to rust, shortening the service life of the mechanical components. If the processor fails, it will be inconvenient to control the closing of the valve, and the valve body cannot be closed by manual control in the short term, which is inconvenient to use. Utility Model Content

[0004] The purpose of the utility model is to provide a control valve for a differential pressure transmitter. When a motor fails, the handle is held and rotated, so that the threaded rod at the bottom end of the handle can be connected to the valve stem and rotated on the first bearing inside the first ring, thereby realizing manual rotation of the valve block on the valve stem inside the docking pipe.

[0005] The utility model is realized through the following technical solutions:

[0006] The utility model is a control valve for a differential pressure transmitter, comprising a differential pressure transmitter, a control valve mounted on the differential pressure transmitter, the control valve comprising a valve stem, a threaded rod fixed to the top of the valve stem, a mounting plate arranged on the control valve, the threaded rod arranged inside the mounting plate, a protective frame mounted on the top surface of the mounting plate, the protective plate fitted on the protective frame, a motor mounted inside the mounting plate, a driving gear mounted on the output shaft of the motor, the driving gear meshingly connected to a driven gear, a cylinder mounted on the bottom end of the driven gear, an internal thread arranged on the inner ring of the cylinder, the threaded rod fitted through the internal thread of the cylinder, a second bearing mounted on the bottom end of the cylinder, the second bearing arranged on the top end of the valve stem, a threaded barrel mounted on the top end of the valve stem, the threaded barrel arranged inside the second bearing, and the bottom end of the threaded barrel fitted with the threaded barrel.

[0007] Furthermore, a butt joint pipe is provided on the top surface of the differential pressure transmitter, a delivery pipe is connected to the butt joint pipe, and a control valve is provided inside the butt joint pipe.

[0008] Furthermore, a first bearing is installed on the bottom end of the valve stem, a first ring is installed on the outer ring of the first bearing, and the first ring is installed on the top surface of the differential pressure transmitter.

[0009] Furthermore, a valve block is arranged on the valve stem, and the valve stem and the valve block are arranged inside the butt joint pipe.

[0010] Furthermore, one end of the threaded rod extends to the outside of the driven gear and the protective plate, and the driven gear is arranged inside the protective frame and the protective plate.

[0011] Furthermore, a turning handle is installed on the top end of the threaded rod.

[0012] The utility model has the following beneficial effects:

[0013] The utility model is provided with a control valve installed inside the butt joint, and a mounting plate is installed on the differential pressure transmitter and the control valve. The cylinder at the bottom end of the driven gear is connected to the second bearing for rotation, so that the valve stem at the bottom end of the second bearing can drive the valve block to rotate inside the butt joint, thereby realizing automatic control. When the motor fails, the handle is rotated by hand, so that the threaded rod at the bottom end of the handle can be connected to the first bearing inside the first ring for rotation of the valve stem, thereby realizing manual rotation of the valve block on the valve stem inside the butt joint.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the differential pressure transmitter and the control valve;

[0016] Figure 2 It is a structural diagram of the control valve;

[0017] Figure 3 Schematic diagram of the internal structure of the butt joint pipe;

[0018] Figure 4 Schematic diagram of the internal structure of the control valve.

[0019] In the figure: 1. Differential pressure transmitter; 101. Docking pipe; 102. Delivery pipe; 2. Control valve; 201. Valve stem; 202. First bearing; 203. First ring; 204. Valve block; 205. Threaded rod; 206. Turn handle; 3. Mounting plate; 301. Protective frame; 302. Protective plate; 303. Motor; 304. Driving gear; 305. Driven gear; 306. Cylinder; 307. Second bearing; 308. Threaded cylinder. DETAILED DESCRIPTION

[0020] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-4 The utility model provides a technical solution: a control valve for a differential pressure transmitter, comprising a differential pressure transmitter 1, a docking pipe 101 is arranged on the top surface of the differential pressure transmitter 1, a delivery pipe 102 is arranged on the docking pipe 101, a control valve 2 is installed on the differential pressure transmitter 1, the control valve 2 comprises a valve stem 201, a threaded rod 205 is fixed on the top end of the valve stem 201, the control valve 2 is arranged inside the docking pipe 101, a first bearing 202 is installed at the bottom end of the valve stem 201, a first ring 203 is installed on the outer ring of the first bearing 202, the first ring 203 is installed on the top surface of the differential pressure transmitter 1, a valve block 204 is arranged on the valve stem 201, the valve stem 201 and the valve block 204 are arranged inside the docking pipe 101, and the valve block 204 can control and discharge the liquid flow inside the docking pipe 101.

[0022] A mounting plate 3 is provided on the control valve 2, and a protective frame 301 is installed on the top surface of the mounting plate 3, and a protective plate 302 is matched on the protective frame 301. A motor 303 is installed inside the mounting plate 3, and a driving gear 304 is installed on the output shaft of the motor 303. The driving gear 304 is meshed with a driven gear 305, and a cylinder 306 is installed at the bottom end of the driven gear 305. The inner ring of the cylinder 306 is provided with an internal thread, and the threaded rod 205 is matched through the internal thread of the cylinder 306. A second bearing 307 is installed at the bottom end of the cylinder 306, and the second bearing 307 is provided at the top end of the valve stem 201. When the driven gear 305 rotates, the cylinder 306 at the bottom end of the driven gear 305 is connected to the second bearing 307 to rotate, so that the valve stem 201 at the bottom end of the second bearing 307 can drive the valve block 204 to rotate inside the docking pipe 101, thereby realizing automatic control.

[0023] A threaded barrel 308 is installed at the top of the valve stem 201, and the threaded barrel 308 is arranged inside the second bearing 307. The bottom end of the threaded rod 205 cooperates with the threaded barrel 308. The threaded rod 205 is arranged inside the mounting plate 3. One end of the threaded rod 205 extends to the outside of the driven gear 305 and the protective plate 302. The driven gear 305 is arranged inside the protective frame 301 and the protective plate 302. A turning handle 206 is installed at the top of the threaded rod 205. When the motor 303 fails, the turning handle 206 is rotated by hand, so that the threaded rod 205 at the bottom end of the turning handle 206 can be connected to the valve stem 201 to rotate in the first bearing 202 inside the first ring 203, thereby realizing manual rotation of the valve block 204 on the valve stem 201 inside the docking pipe 101.

[0024] When using the control valve to control the flow rate of various types of fluids of the differential pressure transmitter, the delivery pipe 102 is connected to the delivery pipes of various types of fluids. When in use, the motor 303 is started so that the driving gear 304 of the output shaft of the motor 303 engages with the driven gear 305 to rotate, and the cylinder 306 at the bottom end of the driven gear 305 is connected to the valve stem 201 through the second bearing 307 and rotates inside the docking pipe 101, so that the valve block 204 on the valve stem 201 can automatically control the valve inside the docking pipe 101, and the turning handle 206 is turned to connect the threaded rod 205 at the bottom end of the turning handle 206 with the threaded cylinder 308. The turning handle 206 is manually turned to ensure that the valve stem 201 and the valve block 204 at the bottom end of the threaded cylinder 308 can rotate in the docking pipe 101, thereby realizing manual operation of the valve and completing the use of the control valve.

[0025] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A control valve for a differential pressure transmitter, comprising a differential pressure transmitter (1), a control valve (2) mounted on the differential pressure transmitter (1), and characterized in that: The control valve (2) comprises a valve stem (201), a threaded rod (205) is fixed on the top of the valve stem (201), a mounting plate (3) is provided on the control valve (2), the threaded rod (205) is provided inside the mounting plate (3), a protective frame (301) is provided on the top surface of the mounting plate (3), a protective plate (302) is fitted on the protective frame (301), a motor (303) is provided inside the mounting plate (3), a driving gear (304) is provided on the output shaft of the motor (303), and the driving gear (304) is meshed with the driven gear ( 305), a cylinder (306) is installed at the bottom end of the driven gear (305), an inner ring of the cylinder (306) is provided with an internal thread, and the threaded rod (205) is matched with the internal thread of the cylinder (306), a second bearing (307) is installed at the bottom end of the cylinder (306), the second bearing (307) is arranged at the top end of the valve stem (201), a threaded cylinder (308) is installed at the top end of the valve stem (201), the threaded cylinder (308) is arranged inside the second bearing (307), and the bottom end of the threaded rod (205) is matched with the threaded cylinder (308).

2. A control valve for a differential pressure transmitter according to claim 1, characterized in that: A butt joint pipe (101) is provided on the top surface of the differential pressure transmitter (1), a delivery pipe (102) is connected to the butt joint pipe (101), and the control valve (2) is provided inside the butt joint pipe (101).

3. A control valve for a differential pressure transmitter according to claim 1, characterized in that: A first bearing (202) is installed at the bottom end of the valve stem (201), a first ring (203) is installed on the outer ring of the first bearing (202), and the first ring (203) is installed on the top surface of the differential pressure transmitter (1).

4. A control valve for a differential pressure transmitter according to claim 3, characterized in that: A valve block (204) is provided on the valve stem (201), and the valve stem (201) and the valve block (204) are arranged inside the butt joint pipe (101).

5. The control valve for a differential pressure transmitter according to claim 1, characterized in that: One end of the threaded rod (205) extends to the outside of the driven gear (305) and the protective plate (302), and the driven gear (305) is arranged inside the protective frame (301) and the protective plate (302).

6. A control valve for a differential pressure transmitter according to claim 5, characterized in that: A turning handle (206) is installed on the top end of the threaded rod (205).

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