Drain valve device for the weighing container of a liquid flow standard device

Abstract

The drain valve device of the weighing container of the liquid flow standard device of the present invention is composed of a valve device, a valve stem transmission device, and a bracket. The valve stem transmission device is composed of a transmission pneumatic cylinder, an electric control valve, a lifting plate, a supporting plate, and a swing bolt. The piston rod of the transmission pneumatic cylinder drives the lifting plate to move upward, and the lifting plate drives the supporting plate to move upward together with the swing bolt. The supporting plate drives the valve stem to move upward through the clamping plate at the upper end of the valve stem to open the valve; when the piston rod of the transmission pneumatic cylinder moves downward, the valve stem moves downward under the action of the compression spring to close the valve. The structure is simple, easy to manufacture, and easy to install and use. When the electronic scale is calibrated, the swing bolt of the valve stem transmission device is opened, the valve device is disconnected from the transmission pneumatic cylinder, and the weighing container / measuring device can be conveniently and quickly removed from the electronic scale.

Description

Technical Field

[0001] The present invention relates to a drain valve device of a weighing container / measuring device of a mass method liquid flow standard device. Background Art

[0002] The mass method liquid flow standard device is a device used to detect the accuracy of liquid flow meters. It uses a high-precision electronic scale to weigh the liquid flowing into the weighing container through the instrument under test over a period of time, thereby calculating the volume or mass of the liquid for comparison and determination of the accuracy of the instrument under test.

[0003] In order to ensure the accuracy of the electronic scale of the mass method liquid flow standard device, the electronic scale needs to be calibrated. When calibrating the electronic scale, the weighing container / measuring device placed on the electronic scale must be removed first, and then the accuracy of the electronic scale must be verified and calibrated.

[0004] Currently, the weighing containers / measuring instruments used in mass-method liquid flow standard devices use pneumatic ball valves or pneumatic butterfly valves as drain valves. According to relevant regulations, the drain time of a weighing container should be no longer than 240 seconds. Larger weighing containers / measuring instruments require correspondingly larger drain valves, which increase their weight and occupy the effective range of the electronic scale. Smaller weighing containers / measuring instruments also have the added weight of the drain valve's solenoid valve, electrical wiring, and air supply piping, which can affect the accuracy of the electronic scale. Regular calibration of the electronic scale requires removing the pneumatic valve, or its electrical wiring and air supply piping, to remove the weighing container, making regular calibration of the electronic scale very inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and provide a drain valve device for a weighing container / measuring device of a mass method liquid flow standard device, so as to facilitate the rapid removal of the weighing container from the electronic scale and facilitate the calibration of the electronic scale.

[0006] The drain valve device of the weighing container of the liquid flow standard device of the present invention is composed of a valve device, a valve stem transmission device and a bracket.

[0007] The valve device consists of a valve body, a valve cover, a valve cover sealing gasket, a valve cover center hole sealing ring, a compression spring, a valve stem, a valve stem base upper plate, a valve stem base lower plate, and a valve port sealing plate.

[0008] The valve body is a three-way pipe valve body, the middle pipe opening of the valve body is the liquid inlet, the lower pipe opening is the liquid outlet, and the upper pipe opening is the valve stem pipe opening. Flanges are respectively provided on the middle pipe opening, the lower pipe opening and the upper pipe opening of the valve body; the valve cover is sealed and fixedly connected to the upper pipe opening flange of the valve body through the valve cover sealing gasket and screws, the valve stem is installed in a sliding fit with the valve cover center hole and is sealed by the valve cover center hole sealing ring, the lower end of the valve stem is a ball head, and the upper plate of the valve stem base and the lower plate of the valve stem base are screwed The nails are fixed together, and the upper plate of the valve stem base and the lower plate of the valve stem base rotate and fit the ball head at the lower end of the valve stem to be contained in the inner center part thereof, and the valve port sealing plate is fixedly connected and installed on the lower end surface of the valve stem base lower plate, and a compression spring is set on the valve stem between the upper plate of the valve stem base and the valve cover, and a boss ring valve port seat is opened on the center hole of the inner end surface of the flange of the lower end pipe of the valve body, and the lower end surface of the valve port sealing plate cooperates with the boss valve port seat to close the liquid outlet under the pressure of the compression spring.

[0009] The valve stem transmission device is composed of a transmission hydraulic cylinder or a pneumatic cylinder, an electric control valve, a lifting plate, a supporting plate, and a movable bolt.

[0010] The bracket is fixedly installed on the ground; the cylinder body of the transmission hydraulic cylinder or pneumatic cylinder is vertically fixedly installed on the bracket, and a lifting plate is fixedly connected and installed on the front end head of the piston rod of the transmission hydraulic cylinder or pneumatic cylinder, and multiple movable bolts are hingedly connected on the circumference of the outer edge of the support plate. A movable bolt slot is opened on the outer edge of the lifting plate corresponding to each movable bolt. The lifting plate and the support plate are connected by a movable bolt 25. The upper end of the valve stem passes through the center hole of the support plate, and a clamping plate is fixedly connected to the upper end of the valve stem. The clamping plate is below the lower end surface of the lifting plate, that is, the upper end surface of the clamping plate does not contact the inner end surface of the lifting plate.

[0011] The piston rod of the transmission hydraulic cylinder or pneumatic cylinder drives the lifting plate to move upward, and the lifting plate drives the supporting plate to move upward through the movable bolt. The supporting plate drives the valve stem to move upward through the clamping plate at the upper end of the valve stem to open the valve; when the piston rod of the transmission hydraulic cylinder or pneumatic cylinder moves downward, the valve stem moves downward under the action of the compression spring to close the valve.

[0012] The present invention has a simple structure, is easy to manufacture, and is convenient to install and use. It is lightweight, and the drainage speed of the drain valve device meets the requirements of relevant regulations. When removing a weighing container or measuring instrument from an electronic scale for calibration, the swing bolt of the valve stem transmission device is opened to disconnect the support plate from the lifting plate, and the valve device from the transmission hydraulic cylinder or pneumatic cylinder, allowing the weighing container or measuring instrument to be quickly and easily removed from the electronic scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The drain valve device of the weighing container of the liquid flow standard device of the present invention is composed of a valve device 1, a valve stem transmission device 2, and a bracket 3.

[0015] The valve device 1 is composed of a valve body 11, a valve cover 12, a valve cover sealing gasket 13, a valve cover center hole sealing ring 14, a compression spring 15, a valve stem 16, a valve stem base upper plate 17, a valve stem base lower plate 18, and a valve port sealing plate 19.

[0016] The valve body 11 is a three-way pipe valve body, the middle pipe opening of the valve body 11 is the liquid inlet pipe opening, the lower pipe opening is the liquid outlet pipe opening, and the upper pipe opening is the valve stem pipe opening. Flanges 11a, 11b, and 11c are respectively provided on the middle pipe opening, the lower pipe opening, and the upper pipe opening of the valve body 11; the valve cover 12 is sealed and fixedly connected to the upper pipe opening flange 11c of the valve body 11 by a valve cover sealing gasket 13 and screws, the valve stem 16 is slidably fitted with the center hole of the valve cover 12, and is sealed by the valve cover center hole sealing ring 14, the lower end of the valve stem 16 is a ball head 161, and the valve stem base upper plate 17 and the valve stem base lower plate 18 are screwed together. The nails are fixed together, and the valve stem base upper plate 17 and the valve stem base lower plate 18 rotate and fit the ball head 161 at the lower end of the valve stem 16 to be contained in the inner center part thereof. The valve port sealing plate 19 is fixedly connected and installed on the lower end surface of the valve stem base lower plate 18 by screws. A compression spring 15 is set on the valve stem 16 between the valve stem base upper plate 17 and the valve cover 12. A boss ring valve port seat 11b' is provided on the center hole of the inner end surface of the pipe orifice flange 11b at the lower end of the valve body 11. Under the pressure of the compression spring 15, the lower end surface of the valve port sealing plate 19 cooperates with the boss valve port seat 11b' to close the liquid outlet.

[0017] The valve stem transmission device 2 is composed of a transmission pneumatic cylinder 21 , an electric control valve 22 of the pneumatic cylinder 21 , a lifting plate 23 , a supporting plate 24 , and a swing bolt 25 .

[0018] The bracket 3 is fixedly installed on the ground; the cylinder body 211 of the transmission pneumatic cylinder 21 is vertically fixedly installed on the bracket 3, and the lifting plate 23 is fixedly connected and installed on the front end head of the piston rod 212 of the transmission pneumatic cylinder 21 by threaded cooperation, and a plurality of movable bolts 25 are hingedly connected on the circumference of the outer edge of the support plate 24. A movable bolt slot 231 is provided on the outer edge of the lifting plate 23 corresponding to each movable bolt 25. The lifting plate 23 and the support plate 24 are connected by the movable bolts 25. The upper end of the valve stem 16 passes through the center hole of the support plate 24, and a clamping plate 162 is fixedly connected to the upper end of the valve stem 16 by screws. The clamping plate 162 is below the lower end surface of the lifting plate 23, that is, the upper end surface of the clamping plate 162 does not contact the inner end surface of the lifting plate 23.

[0019] The piston rod 212 of the transmission liquid pneumatic cylinder 21 drives the lifting plate 23 to move upward, and the lifting plate 23 drives the supporting plate 31 to move upward through the movable bolt 25. The supporting plate 24 drives the valve stem 16 to move upward through the clamping plate 162 at the upper end of the valve stem 16 to open the valve; when the piston rod 212 of the transmission pneumatic cylinder 21 moves downward, the valve stem 16 moves downward under the action of the compression spring 15 to close the valve.

[0020] The valve stem base upper plate 17 and the valve stem base lower plate 18 of the present invention are fixed together by screws, and the valve stem base upper plate 17 and the valve stem base lower plate 18 rotatably fit and contain the ball head 161 at the lower end of the valve stem 16 therein, which is simple and convenient to manufacture and assemble, and can prevent the lower end pipe port flange 11b of the valve body 11 from generating vertical deviation when being welded to the valve body 11, that is, the boss ring valve port seat 11b' on the lower end pipe port flange 11b has a vertical deviation from the valve stem 16, which causes the valve port sealing plate 19 and the boss ring valve port seat 11b' to have a loose sealing fit.

[0021] The valve of the present invention is opened by the valve stem transmission device 2, and the valve is closed by the compression spring 15 acting on the valve stem 16 to naturally descend. The valve is closed by the pressure of the compression spring 15 and the hydraulic pressure of the weighing container / measuring device. Compared with the pneumatic ball valve or pneumatic butterfly valve used in the prior art, the valve has better reliability and longer service life.

[0022] When the valve of the present invention is in the closed state, that is, when the pneumatic cylinder piston rod 212 is extended, the valve stem transmission device 2 is completely separated from the valve device 1 and has no contact. The weight of the valve stem transmission device 2 will not be applied to the electronic scale, and will not affect the accuracy of weighing the weighing container / measuring device on the electronic scale.

Claims

1. A drain valve device for a liquid flow standard device weighing a container, characterized in that It consists of a valve device, a valve stem transmission device, and a bracket; The valve device consists of a valve body, a valve cover, a valve cover gasket, a valve cover center hole sealing ring, a compression spring, a valve stem, a valve stem base upper plate, a valve stem base lower plate, and a valve port sealing plate; The valve body is a three-way pipe valve body, the middle pipe opening of the valve body is the liquid inlet, the lower pipe opening is the liquid outlet, and the upper pipe opening is the valve stem pipe opening. Flanges are respectively provided on the middle pipe opening, the lower pipe opening and the upper pipe opening of the valve body; the valve cover is sealed and fixedly connected to the upper pipe opening flange of the valve body through the valve cover sealing gasket and screws, the valve stem is installed in a sliding fit with the valve cover center hole and is sealed by the valve cover center hole sealing ring, the lower end of the valve stem is a ball head, and the upper plate of the valve stem base and the lower plate of the valve stem base are screwed The valve stem is fixedly connected together by nails, and the upper plate of the valve stem base and the lower plate of the valve stem base rotate and fit the ball head at the lower end of the valve stem into the center part thereof. The valve port sealing plate is fixedly connected and installed on the lower end surface of the valve stem base lower plate. A compression spring is set on the valve stem between the upper plate of the valve stem base and the valve cover. A boss ring valve port seat is opened on the center hole of the inner end surface of the flange of the lower end pipe of the valve body. Under the pressure of the compression spring, the lower end surface of the valve port sealing plate cooperates with the boss ring valve port seat to close the liquid outlet. The valve stem transmission device is composed of a transmission hydraulic cylinder or a pneumatic cylinder, an electric control valve, a lifting plate, a supporting plate, and a movable bolt; The bracket is fixedly installed on the ground; the cylinder body of the transmission hydraulic cylinder or pneumatic cylinder is vertically fixedly installed on the bracket; the lifting plate is fixedly connected and installed on the front end head of the piston rod of the transmission hydraulic cylinder or pneumatic cylinder through threaded cooperation; a plurality of movable bolts are hingedly connected on the circumference of the outer edge of the supporting plate; a movable bolt slot is opened on the outer edge of the lifting plate corresponding to each movable bolt; the lifting plate and the supporting plate are connected by the movable bolts; the upper end of the valve stem passes through the center hole of the supporting plate; a clamping plate is fixedly connected to the upper end of the valve stem; the clamping plate is below the lower end surface of the lifting plate, that is, the upper end surface of the clamping plate does not contact the inner end surface of the lifting plate; The piston rod of the transmission hydraulic cylinder or pneumatic cylinder drives the lifting plate to move upward, and the lifting plate drives the supporting plate to move upward through the movable bolt. The supporting plate drives the valve stem to move upward through the clamping plate at the upper end of the valve stem to open the valve; when the piston rod of the transmission hydraulic cylinder or pneumatic cylinder moves downward, the valve stem moves downward under the action of the compression spring to close the valve.

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