WO2016208938A1

WO2016208938A1 - Piston rotating device for deadweight pressure gauge

Info

Publication number: WO2016208938A1
Application number: PCT/KR2016/006569
Authority: WO
Inventors: 강유신; 장수민
Original assignee: 강유신; 장수민
Priority date: 2015-06-23
Filing date: 2016-06-21
Publication date: 2016-12-29
Also published as: CN107667278B; KR101641081B1; CN107667278A

Abstract

The present invention provides a piston rotating device for a deadweight pressure gauge, which is configured to be switched to free rotation after initial rotation is implemented through a driving force, and which can minimize errors in measurement values due to additional friction. The piston rotating device for a deadweight pressure gauge of the present invention comprises: a drive pulley installed on a base and rotated by the rotating force from a motor; a main rotating ring rotatably installed on the lower outer peripheral surface of a main column; a power transferring member for transferring rotating force from the drive pulley to the main rotating ring; a hook rotatably installed on the main rotating ring so as to protrude in a centrifugal force direction and be inserted in a centripetal force direction; an auxiliary rotating ring rotatably installed on the lower outer peripheral surface of the main column, installed on the top of the main rotating ring and projecting toward the bottom surface, and having an actuating pin installed so as to be caught in the direction in which the hook protrudes; and a hook protrusion installed protruding toward the bottom of a flange of the weight bell and installed to be caught in a state in which the hook is maximally protruded.

Description

Piston rotator of deadweight tester

The present invention relates to a piston rotating device of a deadweight tester, and more particularly, to a piston rotating device of a deadweight tester which is initially rotated by a driving force and then converted into free rotation.

In general, the pressure gauge is a mechanism for measuring the pressure of a liquid or gas, and is divided into a liquid pressure gauge, a weight pressure gauge, a mechanical strain gauge, and the like.

The deadweight pressure gauge uses a method of measuring pressure by using a balanced state of force, and is a pressure gauge used as a primary standard (calibration standard or standard pressure generator) in hydraulic and pneumatic measurement.

Deadweight tester measures the pressure by using the equilibrium between the piston and the weight of the weight on it and the pressure of the fluid applied to the cylinder, the standard pressure (P _S ) is calculated by the following equation (1) do.

In Equation 1, P _S represents a standard pressure (unit: Pa), Σ M represents the sum of the weight of the weight loaded on the piston including the piston mass (unit: kg), g is the local gravity acceleration (unit : Represents i) and A represents the reference cross-sectional area (unit: m <2>) of a piston cylinder.

In Equation (1), all other terms except for the "ΣM" factor in the molecular term are values or constants measured from an environment measuring device. In the case of the ΣM term, the combination or the total sum is set differently depending on the magnitude of the pressure (measurement point).

In general, in the case of a deadweight tester, the pressure range (measurement range) is expressed as the cross-sectional area (A) of the piston-cylinder and the sum of the piston and weight of the molecular term (ΣM) in the denominator term of Equation 1 (standard pressure calculation formula). .

For example, when pressure is applied to the pressure medium with a pressure generator or the like, the piston is pushed up, where the force of the medium (pressure) and the cross-sectional area of the piston-cylinder and the force for pressing the piston (F = M * g) At equilibrium, the pressure at this point is the standard pressure (P _S = F / A).

In the above, the mass (M) including the piston is the local gravity acceleration (g) and the force (F) to create a friction with the cylinder due to the mechanical structure. In order to minimize such friction, a method of rotating the piston is used.

Korean Patent Publication Nos. 10-0982284, 10-0284161 and the like disclose a technique for a deadweight type pressure gauge of various ways to rotate the piston.

A pressure gauge that rotates a piston with a driving force using a conventional motor can maintain a quantitative force and a constant rotational speed, but in addition to friction between the piston and the cylinder, the pressure gauge can induce rotation by mechanical contact. Friction occurs, which acts as an obstacle to receiving gravity acceleration (g) during the operation of the deadweight tester, which may increase the error in the generation and maintenance of pressure.

Korean Patent Publication No. 10-0806959 discloses a technique for reducing friction by moving a cylinder up and down. For example, by providing a piezoelectric disk and an elastic body, the thickness of which changes as the power is applied, to provide a structure to reduce the friction by moving the cylinder up and down without rotating the piston.

When the cylinder is moved as described above, the movement distance is inevitably very limited, and it is difficult to obtain a sufficient friction reducing effect.

The present invention is to solve the problems of the prior art as described above, an object of the present invention is to provide a piston rotating device of a deadweight pressure gauge that can minimize the error of the measured value.

In order to solve the above problems, the present inventors initially configured to be rotated by a driving force and then converted to free rotation, thereby minimizing an error in measured values due to additional friction.

According to the piston rotating device of the deadweight type pressure gauge according to an embodiment of the present invention, the driving force is transmitted according to the forward rotation of the motor to rotate the main rotation ring, the front surface of the hook is caught by the operation pin as the main rotation ring rotates Rotation in the direction of the centrifugal force protrudes, the hook is caught on the front of the hook and the weight bell also rotates with the main rotary ring. At this time, the piston pressed in close contact with the weight bell also rotates, and friction between the piston and the cylinder occurs, thereby minimizing the resistance due to friction.

And according to the piston rotation apparatus of the deadweight type pressure gauge according to an embodiment of the present invention, the main rotation ring is rotated in reverse by stopping the forward rotation of the motor and the reverse rotation, the hook is in close contact with the engaging projection and the working pin It is spaced apart from the state, the hook is inserted by rotating in the centripetal direction by the contact of the elastic force and the release pin of the elastic member, the weight bell is switched to the free rotation state.

Therefore, the piston rotation apparatus of the deadweight type pressure gauge according to the embodiment of the present invention is initially rotated by the driving force, but because the free rotation is made in a state of a certain degree of rotation, to maintain a constant rotational speed with a quantitative force It is also possible, of course, to minimize the occurrence of additional friction due to the structural contact between the hook and the hook when driven by an external force.

1 is a cross-sectional view showing a piston rotating device of a deadweight tester according to an embodiment of the present invention.

Figure 2 is a partially enlarged partial cross-sectional perspective view showing a piston rotating device of a deadweight tester according to an embodiment of the present invention.

Figure 3 is a plan view for explaining the operating state of the hook in the piston rotary device of the deadweight type pressure gauge according to an embodiment of the present invention.

The present invention provides a base, a cylindrical main column formed in a state in which a pressure medium moves therein and installed on the base, a cylinder installed inside an upper end of the main column, and sliding inside the cylinder. A piston which can be inserted and installed, a piston cap installed at an upper end of the piston and spaced apart from an upper end of the main pillar, and installed to surround an outer circumferential surface at intervals from the main pillar, and an edge of the piston cap. In the weight-type pressure gauge which is installed to press on the upper surface and comprises a weight bell which is installed on the lower end of the flange for supporting the weight is mounted for measurement,

A drive pulley installed on the base and rotating with the rotational force of the motor,

A main rotation ring rotatably installed on the outer circumferential surface of the lower end of the main pillar,

A power transmission member for transmitting the rotational force of the drive pulley to the main rotation ring;

Hooks rotatably installed in the main rotation ring to protrude in the centrifugal force direction and to be inserted in the centripetal force direction;

An auxiliary rotary ring rotatably installed on an outer circumferential surface of the lower end of the main pillar, installed on an upper portion of the main rotary ring, and provided with an operation pin installed to protrude toward a lower surface and to be caught in a direction in which the hook protrudes;

It relates to a piston rotating device of a pressure gauge including a locking protrusion which is installed to protrude below the flange of the weight bell and is installed to be caught in a state where the hook is protruded to the maximum.

In addition, the present invention is characterized in that to install the two to four at a position corresponding to each other at equal intervals the hook projection, hook and the operation pin.

In addition, the present invention is characterized in that for releasing pins at intervals of 30 to 90 ° in the rear direction of the hook corresponding to the operation pin to the auxiliary rotary ring.

In addition, the present invention is characterized in that the elastic member for applying a force to be inserted into the hook in the direction of the centripetal force to the main rotation ring.

In addition, the present invention is characterized in that the motor is configured to temporarily reverse rotation when the rotation stops in the forward direction.

In addition, the present invention is characterized in that the motor is instantaneously rotated in the reverse direction by using only the power charged in the battery when the power is cut off by connecting the battery in parallel to the power supplied in the forward rotation.

In addition, the present invention detects the reverse rotation time of the motor through the sensor, if the shorter than the predetermined time to supply additional power to increase the reverse rotation time, if longer than the predetermined time to turn off the reverse rotation Characterized in that configured to stop.

Next, a preferred embodiment of the piston rotating device of the deadweight tester according to the present invention will be described in detail with reference to the drawings.

As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Hereinafter, in order to clearly describe the present invention, a detailed description of parts not closely related to the present invention will be omitted. Like reference numerals refer to the same or similar elements throughout the specification, and repeated descriptions thereof will be omitted.

First, as shown in FIGS. 1 and 2, a piston rotating device of a deadweight tester according to an embodiment of the present invention includes a base 10, a main cylinder 20, a cylinder 30, and a piston ( 40), a piston cap 50, and a deadweight pressure gauge including a weight bell (60).

The main pillar 20 is fixedly installed in a standing state on the base 10.

The main pillar 20 is formed in a cylindrical shape having a thickness, and a flow path 24 through which a pressure medium moves is formed therein.

The cylinder 30 is installed inside the upper end of the main pillar 20.

The piston 40 is inserted into the cylinder 30 so as to be slideable.

The piston cap 50 is installed at the upper end of the piston 40.

The piston cap 50 is installed to rotate and move integrally with the piston 40.

The piston cap 50 is installed in a spaced state so as not to generate friction with the upper end of the main pillar (20).

The weight bell 60 is installed to surround the outer circumferential surface of the periodic pillar 20 at intervals from the periodic pillar 20.

The weight bell 60 is formed in a cylindrical shape.

The weight bell 60 is provided with a flange 64 for supporting a weight mounted for measurement to protrude in a ring shape on the outer circumferential surface of the lower end portion.

The upper surface of the weight bell 60 is formed to press the edge of the piston cap 50 from above.

In the deadweight type pressure gauge configured as described above, when the weight is mounted on the weight bell 60, a force pressing downward on the piston cap 50 by the weight of the weight and the weight bell 60 acts, and the piston Vertical force is applied to the cap 50 and the piston 40 to move downward.

The configuration of the base 10, the main column 20, the cylinder 30, the piston 40, the piston cap 50, the weight bell 60 is carried out by applying the configuration of the pressure gauge commonly used Since it is possible, the detailed description is omitted.

Piston rotating device of the deadweight type pressure gauge according to an embodiment of the present invention, as shown in Figures 1 to 3, the drive pulley 120, the main rotary ring 140, the power transmission member 130, The hook 150, the auxiliary rotation ring 160, and comprises a locking protrusion 170.

The drive pulley 120 is rotatably installed on the base 10.

The drive pulley 120 is connected to the shaft of the motor 110 is installed.

The drive pulley 120 is driven and rotated by the rotational force of the motor 110.

The main rotation ring 140 is rotatably installed on the outer peripheral surface of the lower end of the main pillar (20).

For example, the main rotation ring 140 is rotatably installed on the outer circumferential surface of the main pillar 20 through a bearing 190.

The power transmission member 130 performs a function of transmitting the rotational force of the drive pulley 120 to the main rotation ring (140).

The power transmission member 130 can also be configured using a belt.

As the power transmission member 130, it is also possible to use a gear or chain in addition to the belt.

It is also possible to form a belt groove 148 in the main rotation ring 140 so that the power transmission of the belt which is the power transmission member 130 is more reliably made.

The hook 150 is rotatably installed in the main rotation ring 140.

For example, the hook 150 is rotatably installed on the main ring 140 using a hinge pin 156.

The hook 150 is installed to protrude in the centrifugal force direction and to be inserted in the centripetal force direction to the main rotation ring 140.

The main rotating ring 140 is provided with an installation groove 145 into which the hook 150 is inserted, and the size of the installation groove 145 is limited to limit a range in which the hook 150 is rotated in the protruding direction. Set to form.

The auxiliary rotation ring 160 is rotatably installed on the outer peripheral surface of the lower end of the main pillar (20).

For example, the auxiliary rotation ring 160 is rotatably installed on the outer circumferential surface of the main pillar 20 through a bearing 190.

The auxiliary rotation ring 160 is installed at intervals above the main rotation ring 140.

An operation pin 164 is installed on the auxiliary rotation ring 160 to protrude toward the bottom surface and to be caught in the direction in which the hook 150 protrudes.

The locking protrusion 170 is installed to protrude below the flange 64 of the weight bell (60).

The locking protrusion 170 is installed to be caught in a state in which the hook 150 protrudes to the maximum.

The hook 150 is formed so that the front surface 152 in contact with the engaging protrusion 170 and the operation pin 164 is in contact with the radial direction in the state in which the hook 150 protrudes to the maximum.

In the above, the size of the installation groove 145 formed in the main rotation ring 140 is set to limit the state in which the hook 150 protrudes to the maximum (a state in which the front surface 152 coincides with the radial direction).

When the main rotation ring 140 is rotated in the counterclockwise direction as shown in FIG. 3 in the state configured as described above, when the operation pin 164 is caught in contact with the front surface 152 of the hook 150, the hook ( 150 is rotated in a clockwise direction about the hinge pin 156 to protrude from the installation groove 145 of the main rotary ring 140, the engaging projection 170 is the front surface 152 of the hook 150 It becomes in the state which hangs (it shows with solid line in FIG. 3).

The locking protrusion 170, the hook 150, and the operation pin 164 are installed at two to four positions corresponding to each other at equal intervals.

For example, the engaging protrusion 170, the hook 150, and the operation pin 164 may be installed by placing two at intervals of 180 °.

If the hooking protrusion 170 and the hook 150 and the operation pin 164 are arranged at equal intervals as described above, the main rotation ring 140 on the auxiliary rotation ring 160 and the weight bell 60. The rotational force of can be transmitted more reliably by minimizing the shaking.

In addition, the auxiliary rotation ring 160 may be provided with a release pin 166 at an interval of 30 to 90 ° in a direction toward the rear surface 154 of the hook 150 in response to the operation pin 164.

On the rear surface 154 of the hook 150, a locking jaw is formed to catch the release pin 166.

When the main rotation ring 140 is rotated in the clockwise direction as shown in FIG. 3 in the state configured as described above, the release pin 166 is caught on the latching jaw of the rear surface 154 of the hook 150, and the hook 150 ) Rotates counterclockwise around the hinge pin 156 and is inserted into the installation groove 145 of the main rotation ring 140 to a position not in contact with the locking protrusion 170 (dotted line in FIG. 3). ).

In addition, although not shown in the drawing, the main rotation ring 140 may be provided with an elastic member for applying a force to be inserted into the hook 150 in the centripetal force direction.

It is also possible to use a torsion spring as the elastic member.

The outer circumferential surfaces of the main rotating ring 140 and the auxiliary rotating ring 160 are formed to have a sufficiently small diameter so as not to contact the locking protrusion 170.

In the above, the motor 110 may be configured to temporarily reverse rotation in the forward direction.

For example, when the power is cut off by connecting a battery (capacitor, etc.) in parallel to the power supplied in the forward rotation, the motor 110 may be instantaneously rotated in the reverse direction using only the power charged in the battery. It is possible.

Next will be described the operation of the piston rotary device of the deadweight type pressure gauge according to an embodiment of the present invention configured as described above.

First, when the motor 110 is rotated forward, the rotational force of the motor 110 is transmitted to the main rotation ring 140 through the drive pulley 120 and the power transmission member 130, the main rotation ring 140 ) Rotates counterclockwise as shown in FIG. 3. At this time, the auxiliary rotary ring 160 and the weight bell 60 is in a stopped state.

As the main rotation ring 140 in the counterclockwise direction (forward rotation) as described above, the front surface 152 of the hook 150 is caught in contact with the operation pin 164 installed on the auxiliary rotation ring 160, The hook 150 is rotated in the centrifugal force direction (clockwise direction in FIG. 3) around the hinge pin 156 to protrude from the installation groove 145 of the main rotating ring 140, the main rotating ring 140 The auxiliary rotation ring 160 is also rotated together. At this time, the weight bell 60 is in a stopped state.

As the main rotation ring 140 and the auxiliary rotation ring 160 rotates as described above, the front surface 152 of the hook 150 is caught in contact with the engaging protrusion 170 installed on the weight bell 60, The weight bell 60 is also rotated together with the main rotary ring 140. At this time, the piston cap 50 and the piston 40, which are pressed in a close state by the weight bell 60, also rotate together, and motion friction occurs between the piston 40 and the cylinder 30, thereby causing resistance to friction. This is minimized.

When the weight bell 60 is rotated in the above-described process and reaches a rotation speed (RPM) of a desired level (set level), the power supply to the motor 110 is cut off to stop the power of the motor 110. Stop forward rotation.

In addition, the motor 110 is reversely rotated by supplying power in a reverse direction (for example, power charged in a capacitor) to the motor 110.

When the motor 110 is reversely rotated as described above, the main rotation ring 140 received through the driving pulley 120 and the power transmission member 130 in the rotational force of the motor 110 is clockwise as shown in FIG. 3. It will rotate in the reverse direction.

As the main rotary ring 140 rotates in the clockwise direction, the front surface 152 of the hook 150 is spaced apart from the state in close contact with the locking protrusion 170 and the operation pin 164.

When the front surface 152 of the hook 150 is in close contact with the engaging protrusion 170 and the operation pin 164 as described above, the weight bell 60 and the auxiliary rotary ring 160 is the main rotation ring Since the rotational force of the 140 is not transmitted, the weight bell 60 and the auxiliary rotation ring 160 continue to rotate counterclockwise (forward rotation) by inertia.

As the main rotation ring 140 rotates in the clockwise direction as described above, the rear surface 154 of the hook 150 is caught in contact with the release pin 166 installed on the auxiliary rotation ring 160, and the auxiliary rotation Since the ring 160 is rotated in the counterclockwise direction, the release pin 166 pushes the hook 150, and the hook 150 is in the centripetal direction of the hinge pin 156 (FIG. 3). It is rotated in the counterclockwise direction, and the hook 150 is inserted into the installation groove 145 of the main rotation ring 140.

In the auxiliary rotation ring 160 is rotated in the clockwise direction with the main rotation ring 140 by changing the rotation direction as the release pin 166 is caught on the back 154 of the hook 150 (reverse rotation) Done. At this time, the weight bell 60 continues to rotate in the counterclockwise direction (free rotation) by free rotation by inertia is maintained.

Unlike the above, when installing an elastic member such as a torsion spring on the hook 150 instead of the release pin 166, the hook 150 is in close contact with the locking protrusion 170 and the operation pin 164 When spaced apart, the elastic force by the elastic member is applied to the hook 150 so that the hook 150 is rotated in the centripetal force direction (counterclockwise as seen in Figure 3) around the hinge pin 156 (the main rotation ring ( It is inserted into the installation groove 145 of 140.

In the state in which the hook 150 is inserted into the installation groove 145 of the main rotation ring 140, the main rotation ring 140 and the auxiliary rotation ring 160 reverse rotation together, the weight bell No contact is made between the hook protrusion 170 and the hook 150 installed in the 60, and the weight of the weight bell 60 is maintained without the rotational force of the main rotation ring 140 being transmitted.

Therefore, according to the piston rotating device of the deadweight pressure gauge according to an embodiment of the present invention configured and operated as described above, initially the rotation of the weight bell 60 and the piston 40 is rotated by the driving force of the motor 110 It is made of, but because the rotation is made to some extent is made of free rotation, it is also possible to maintain a constant rotational speed with a quantitative force, as well as between the engaging protrusion 170 and the hook 150 when driven by an external force It is possible to minimize the occurrence of additional friction due to the structural contact of.

In the above, a preferred embodiment of a piston rotating device of a deadweight tester according to the present invention has been described, but the present invention is not limited thereto, and various modifications are made within the scope of the claims and the description of the invention and the accompanying drawings. It is possible to do this and this also belongs to the scope of the present invention.

The present invention can be used for a deadweight tester and a device including the same.

Claims

A base and a cylindrical main column which is formed in a state in which a pressure medium moves therein and is installed on the base, a cylinder which is installed inside the upper end of the main column, and a sliding movement is possible inside the cylinder. A piston to be inserted and installed, a piston cap installed at an upper end of the piston and spaced apart from an upper end of the main pillar, and installed to surround an outer circumferential surface at intervals from the main pillar, and an edge of the piston cap at an upper surface thereof. In a weight-type pressure gauge comprising a weight bell which is installed to press and a flange supporting a weight to be mounted for measurement includes a weight bell installed at a lower end thereof.

A drive pulley installed on the base and rotating with the rotational force of the motor,

A main rotation ring rotatably installed on the outer circumferential surface of the lower end of the main pillar,

A power transmission member for transmitting the rotational force of the drive pulley to the main rotation ring;

Hooks rotatably installed in the main rotation ring to protrude in the centrifugal force direction and to be inserted in the centripetal force direction;

An auxiliary rotary ring rotatably installed on an outer circumferential surface of the lower end of the main pillar, installed on an upper portion of the main rotary ring, and provided with an operation pin installed to protrude toward a lower surface and to be caught in a direction in which the hook protrudes;

Protruding under the flange of the weight bell and the piston rotating device of the pressure gauge including a locking projection is installed so as to be caught in a state that the hook protrudes to the maximum.
The method according to claim 1,

The locking projection and the hook and the operating pin is a piston rotary device of the deadweight type pressure gauge to install 2 to 4 at positions corresponding to each other at equal intervals.
The method according to claim 1 or 2,

The auxiliary rotary ring piston rotation device of the deadweight type pressure gauge to install a release pin at an interval of 30 ~ 90 ° in the rear direction of the hook corresponding to the operating pin.
The method according to claim 1 or 2,

Piston rotating device of the pressure-type pressure gauge is installed in the main rotating ring to install an elastic member for applying a force to be inserted in the centripetal force direction to the hook.
The method according to claim 1 or 2,

Wherein the motor is a piston rotating device of the deadweight type pressure gauge which is configured to temporarily reverse rotation when the rotation stops in the forward direction.
The method according to claim 5,

A piston rotating device of a deadweight type pressure gauge configured to rotate a motor instantaneously by using only the power charged in the battery when the power is cut off by connecting the battery in parallel to the power supplied in the forward rotation.
The method according to claim 5,

When the reverse rotation time of the motor is sensed by the sensor, if the shorter than the predetermined time to supply additional power to increase the reverse rotation time, if the longer than the predetermined time configured to stop the reverse rotation by cutting off the power Piston rotators of dynamic manometers.