KR101635420B1 - A variable air volume control device on the venturi type - Google Patents

A variable air volume control device on the venturi type Download PDF

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Publication number
KR101635420B1
KR101635420B1 KR1020160026294A KR20160026294A KR101635420B1 KR 101635420 B1 KR101635420 B1 KR 101635420B1 KR 1020160026294 A KR1020160026294 A KR 1020160026294A KR 20160026294 A KR20160026294 A KR 20160026294A KR 101635420 B1 KR101635420 B1 KR 101635420B1
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KR
South Korea
Prior art keywords
shaft
opening
housing
coupled
closing
Prior art date
Application number
KR1020160026294A
Other languages
Korean (ko)
Inventor
김종석
Original Assignee
서진공조 주식회사
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Priority to KR1020160026294A priority Critical patent/KR101635420B1/en
Application granted granted Critical
Publication of KR101635420B1 publication Critical patent/KR101635420B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H21/00—Gearings comprising primarily only links or levers, with or without slides
    • F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
    • F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H21/00—Gearings comprising primarily only links or levers, with or without slides
    • F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
    • F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
    • F16H21/18—Crank gearings; Eccentric gearings
    • F16H21/22—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric
    • F16H21/32—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric with additional members comprising only pivoted links or arms
    • F24F11/04—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/12—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of sliding members

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The present invention relates to a venturi-shaped variable air volume control unit, comprising: a housing, wherein a venturi part is formed on an inner circumferential face; an opening and closing member which consists of a shaft installed on the center inside the housing through a support, and an opening and closing adjustment cone coupled to the shaft to adjust an opening and closing degree of the venturi part; an actuator fixed and coupled to an outer periphery of the housing such that a rotary axis is installed on and connected to the support in a state of penetrating the housing; and an interworking transfer part installed and connected between the shaft and the rotary axis to transfer rotary force of the rotary axis by converting into rectilinear motion. Accordingly, the opening and closing degree of the venturi part is adjustable by the opening and closing adjustment cone by moving the shaft forward and backward in accordance with normal and reverse rotation operation of the actuator.

Description

[0001] The present invention relates to a variable air volume control device having a venturi shape,

The present invention relates to a variable air volume regulating device having a venturi shape, and more particularly, to a variable air volume regulating device having a venturi shape, and more particularly, It is possible to prevent the gap from being formed by matching the size of the operating hole with the diameter of the pivot shaft and also to have the airtightness and the excellent heat insulating performance as well as the noise reduction, It is possible to easily convert and transmit the rotational force of the rotary shaft to the linear motion of the shaft by the interlocking transmitting portion composed of the elevating guide, the elevating and lowering engaging portion, and the operating link, And to enhance durability and interlockability through auxiliary operating means assisting the operation of the operating link And a function type air conditioner having a venturi shape in which a malfunction does not occur even in long-term use.

Generally, the air supplied to the air conditioning and special laboratory is supplied to the room through the variable air volume regulator.

However, since the conventional variable air volume regulator can not effectively induce effective air, there is a problem in that it can not supply comfortable air suited to a change in the room temperature, and there is a drawback that more energy than necessary is consumed.

In order to solve such a conventional drawback, the present applicant has filed a "Variable air volume control device" of Korean Utility Model Registration No. 20-0376799, but the above-mentioned conventional technique has been used in practice and as a result, As a result, the lubrication performance of the hinge-coupled portion is lowered, resulting in noise and an inaccurate operation due to a decrease in airtightness, resulting in malfunction.

Accordingly, there has been a demand for a variable air volume controller which does not cause noise and malfunction as well as smooth operation. As a part of this, the present applicant has developed a "variable air volume controller" of Korean Patent Registration No. 10-0911156.

Korean Patent Registration No. 10-0911156 (Jul. 31, 2009) "Variable air volume regulator" - Seojin Air Conditioning Co., Ltd.

However, the above-mentioned conventional "variable air volume regulator" is configured to move the inner shaft in the forward and backward direction by a link that rotates with respect to the hinge axis in a state of being coupled to the rod moving back and forth in accordance with the operation of an actuator installed outside, There is a problem that a space for moving a link that rotates with respect to a hinge axis is required, and thus an operation hole into which a link is inserted must be formed in a large size.

That is, in order to operate the link, the size of the operation hole has to be large, so that the operation noise is reduced, the airtightness is maintained, and the heat insulation is not smooth.

Further, there is also a problem that the volume of the product becomes large due to the operating space occupation of the rod operating in the forward and backward directions and the link interlocked by the rod by the actuator.

Thus, the applicant of the present invention is able to prevent the problem of the product from being used for a long time, as well as to make the product compact and compact, to reduce the operating noise, to keep the airtightness and heat insulation smooth A variable air volume control device having a venturi shape has been developed.

An object of the present invention is to make it possible to make the opening and closing movement of the opening and closing member controlling the degree of opening and closing of the venturi part through the interlocking transmission part connected to the pivot shaft so that the size of the operating hole formed in the housing is adjusted to the diameter of the pivot shaft, And it is an object of the present invention to provide a variable air volume control apparatus having a venturi shape capable of not only reducing noise but also maintaining airtightness and excellent heat insulation performance.

It is another object of the present invention to provide a variable air volume control apparatus having a venturi shape in which a product can be manufactured and installed in a compact manner by providing a pivot shaft of the actuator inside the housing.

In addition, according to the present invention, it is possible to easily convert and transmit the rotational force of the rotary shaft to the linear motion of the shaft by the interlocking transmitting portion composed of the elevating guide, the elevating and lowering engaging portion and the operating link, And it is an object of the present invention to provide a variable air volume control device having a venturi shape that improves durability and interlockability through auxiliary operation means assisting the operation of the operation link, so that malfunction does not occur even when used for a long time.

According to an aspect of the present invention, there is provided a portable terminal comprising: a housing having a venturi portion formed on an inner circumferential surface thereof; An opening / closing member formed of a shaft installed at an inner center of the housing through a support member, and an opening / closing adjusting cone coupled to the shaft to adjust an opening / closing degree of the venturi unit; An actuator fixedly coupled to an outer periphery of the housing such that the pivot shaft is connected to the supporter in a state of passing through the housing; And an interlocking transmission unit connected between the shaft and the pivot shaft for converting the rotational force of the pivot shaft into a linear motion of the shaft and transmitting the linear motion to the front and rear of the shaft according to forward and reverse rotation of the actuator, A variable air volume regulating device having a venturi shape characterized by being able to control the degree of opening and closing of the venturi by the regulating cone.

Since the variable air volume adjusting device having the venturi shape of the present invention can move the back and forth movement of the opening and closing member that controls the degree of opening and closing of the venturi portion through the interlocking transmission portion connected to the pivoting shaft, It is possible to prevent the gap from being formed in accordance with the diameter of the rotary shaft. This makes it possible to maintain the airtightness and the excellent heat insulation performance as well as reduce the noise.

In addition, since the rotation axis of the actuator is installed inside the housing, the present invention can be manufactured in a compact manner, so that it is advantageous in manufacturing and installing the product.

In addition, according to the present invention, it is possible to easily convert and transmit the rotational force of the rotary shaft to the linear motion of the shaft by the interlocking transmitting portion composed of the elevating guide, the elevating and lowering engaging portion and the operating link, It is possible to improve the durability and interlockability through the auxiliary operation means for assisting the operation of the operation link, so that it is a useful invention that does not cause malfunction even for long time use.

Brief Description of the Drawings Fig. 1 is an operating state in which an opening and closing member is moved back and forth in accordance with the driving of an actuator of the present invention to adjust opening and closing degrees of a venturi portion. Fig.
2 is a schematic view showing a cross section of a variable air volume regulator having a venturi shape according to the present invention.
3 is a perspective view showing a state in which the opening and closing member of the present invention is combined with the pivot shaft and the interlocking transmitting portion.
Fig. 4 is a partially enlarged view showing the essential part of Fig. 3; Fig.

Hereinafter, the structure of the present invention will be described.

1 to 4, the present invention relates to a variable air volume adjusting device 100 having a venturi shape that can maintain a constant air volume by adjusting an input amount of outside air, and includes a venturi unit 15 on an inner circumferential surface, (10); A shaft 23 provided at the center of the inside of the housing 10 through a support 21 and an opening and closing adjusting cone 25 coupled to the shaft 23 to adjust the degree of opening and closing of the venturi 15. [ An opening and closing member (20); An actuator 30 fixedly coupled to the outer periphery of the housing 10 so as to be connected to the supporter 21 in a state where the pivot 31 passes through the housing 10; And an interlocking transmission unit 40 connected between the shaft 23 and the rotary shaft 31 for converting the rotary force of the rotary shaft 31 into linear motion of the shaft 23 and transmitting the linear motion, Backward movement of the shaft 23 in accordance with the forward and reverse rotation of the opening / closing control cone 25 to adjust the open / closed degree of the venturi portion 15 by the opening / closing control cone 25.

Hereinafter, the variable air volume adjusting apparatus 100 having the venturi shape of the present invention will be described in more detail.

First, the housing 10 is formed as a cylindrical body with an inlet 11 formed at a front side on one side thereof and an outlet 13 formed at the rear side of the housing 10, and between the inlet 11 and the outlet 13, that is, The venturi portion 15 is formed to have a smaller diameter than the inlet 11 and the outlet 13.

Further, it is preferable that the housing 10 further includes a conventional filler 17 which serves as noise reduction and heat insulation.

The operation hole 19 is formed in the housing 10 so as to penetrate the inside and outside of the housing 10 so that the rotation shaft 31 of the actuator 30 can be inserted and inserted into the housing 10. Since the rotary shaft 31 rotates in place, it can be formed to have the same size as the diameter of the rotary shaft 31, thereby effectively preventing the internal noise and heat from leaking to the outside, that is, , Space required for the operation is not required, so that it is possible to make the product compact and easy to install.

Secondly, the opening / closing member 20 is provided inside the housing 10 to adjust the opening / closing degree of the venturi portion 15 as described above. In order to adjust the opening / closing degree of the venturi portion 15, A support 21 for installing the linearly moving shaft 23 is installed in the passage 11 side passage and the passage 13 side passage respectively and each support base 21 is provided with a through hole (21a) is formed.

The shaft 23 is provided with an interlocking transmission portion 40 at the end of the shaft 23 for coupling the rotation of the actuator 30 to the linear motion transmitting portion 40. [ And a fastening hole (23a) to which the fastening member (23) is fastened.

The shaft 23 is formed with an opening and closing adjusting cone 25 which is fixedly installed near the center of the shaft 23 through a normal snap ring or the like. A hollow body which is fitted in the inner circumference of the hemispherical portion and the conical portion, and a hollow body which is joined to the front of the hemispherical portion, A plunger inserted into a rear end of the body, and a spring or a double spring provided between the cap and the plunger, so that a detailed description thereof will be omitted.

Thirdly, the actuator 30 is fixedly coupled to the outer periphery of the housing 10 to linearly move the opening and closing member 20 in the forward and backward directions using the rotational force of the rotary shaft 31, The actuator 30 constitutes a pivot 31 inserted into the housing 10 through an operation hole 19 formed in the housing 10 and connected to a support 21 on one side, It is preferable to use a conventional bracket so that it can be easily fixed to the outer periphery of the main body 10.

The rotary shaft 31 of the actuator 30 must be rotatably coupled to the support 21. The rotary shaft 31 is provided with a coupling groove 33a And a coupling hole 22a in which the coupling hole 33 is inserted is formed in the support base 21 so as to be easily achieved. The rotation shaft 31 fitted in the coupling hole 22a of the support table 21 can be pivotally coupled only by fastening the snap ring S to the coupling groove 33a.

Fourth, the interlocking transmission unit 40 is connected between the shaft 23 and the rotary shaft 31 to convert the rotary force of the rotary shaft 31 into a linear motion of the shaft 23, The elevation guide 44, the elevation coupling portion 45, and the operation link 47. Hereinafter, the detailed structure of the interlocking transmission portion 40 will be described in detail.

The elevation guide 44 serves to convert the rotational force of the rotary shaft 31 into a rectilinear motion of the shaft 23 and to transmit the rectilinear motion of the shaft 23 to the elevation opening 41 And an opening for insertion and operation of the shaft 23 is formed in the hatch 41 for this purpose.

A guide hole 42 is formed at both sides of the elevation opening 41 to connect the elevation coupling portion 45 to the coupling hole 23a formed in the shaft 23. The guide hole 42 has a rotational force The elevation opening 41 is moved up and down in accordance with the rotation of the pivot shaft 31 and the operation of linearly moving the shaft 23 in the forward and backward directions is performed do.

A first fastening protrusion 43 for coupling the operating link 47 is formed at one side of the elevating opening 41. The first fastening protrusion 43 is connected to the operating link 47 through a normal snap ring, And the first fastening protrusion 43 is formed on the outer periphery of the first fastening protrusion 43 so that the snap ring is fastened.

The lifting engagement portion 45 is configured to be engaged with the guide hole 42 of the elevation guide 44 so as to be coupled to one end of the shaft 23, that is, the fastening hole 23a, A coupling shaft 45a fitted into the coupling hole 23a and the guide hole 42 and a normal coupling member 45b coupled to an end of the coupling shaft 45a to prevent separation of the coupling shaft 45a, .

Here, the fastening member 45b may be easily formed as a snap ring and fastened to the fastening groove formed at the end of the fastening shaft 45a.

The operation link 47 is fixed to the rotary shaft 31 at one side and rotatably coupled to the first fastening protrusion 43 at the other side so that the elevation guide 44 is rotatably supported on the rotary shaft 31 of the operating link 47. To this end, a coupling step 35 is further formed at an end of the pivot shaft 31, It is preferable that the coupling hole portion 47a having a shape corresponding to the coupling step 35 is further included.

In this configuration, one end of the actuating link 47 having the engaging step 35 inserted therein is engaged with the supporting step 21, that is, the engaging support portion The shaft 23 can be stably installed in the vicinity of the shaft 22 in accordance with the guide of the lifting engagement portion 45 coupled to the guide hole 42 of the elevation guide 44. [ ) Can be smoothly performed.

It is preferable that the interlocking transmission unit 40 further includes auxiliary operation means 49 for assisting the operation of the operation link 47. Such auxiliary operation means 49 may be formed on the support 21 A second fastening protrusion 49b formed on the elevating opening 41 so as to be symmetrical with the first fastening protrusion 43 on the basis of the guide hole 42 and a second fastening protrusion 49b formed on one side of the interlocking protrusion 49a And the other end is connected to the second fastening protrusion 49b to facilitate the operation of the operating link 47. According to this, It is possible to obtain an operational effect that the malfunction does not occur.

The coupling between the cooperating protrusion 49a and the auxiliary coupling 49c coupled to the first coupling protrusion 49b may be such that the both sides of the auxiliary coupling 49c can be pivoted through a coupling such as a normal snap ring.

Hereinafter, the operation of the preferred embodiment of the present invention will be described.

First, when the permissible air flow rate is set in the control unit (not shown), the rotation shaft 31 is rotated by the driving of the actuator 30, and the interlocking transmission unit 40 is rotated clockwise Or counterclockwise to linearly move the shaft 23 in the forward and backward directions.

That is, the operating link 47 fixedly coupled to the rotating shaft 31 rotates relative to the rotating shaft 31 and thereby the elevating guide 44 rotatably coupled to the other side of the operating link 47, And the shaft 23 coupled to the elevation guide 44 linearly moves in the forward and backward directions as the elevation guide 44 is rotated.

Therefore, the air flow rate can be adjusted by adjusting the interval between the opening / closing member 25 and the venturi unit 15, that is, the opening / closing degree of the opening / closing member 20.

In the above operation, the auxiliary operation means 49 assisting the operation of the operation link 47 assists the rotation operation of the elevation guide 44 to enhance the durability and interlockability, so that a malfunction occurs even for a long time of use Since the rotary shaft 31 rotating by the actuator 30 rotates in place so that the operating hole 19 of the housing 10 can be manufactured in accordance with the diameter of the rotary shaft 31, And the heat can be prevented from leaking to the outside through the clearance between the operating hole (19) and the rotating shaft (31).

After the air volume is set as described above, air is introduced from the inlet 11 of the housing 10 and discharged to the outlet 13. When the air volume is higher than the set air pressure, So that the opening / closing control cone 25 is pushed rearward to adjust the air volume.

This airflow control is achieved by expansion and contraction of a cap and a plunger provided on the opening / closing control cone 25, and a double spring provided on the cap and the plunger, so that absorption and dispersion of low or high pressure are possible, So that the variable air volume control can be facilitated.

10: Housing 11: Inlet 13: Outlet 15: Venturi 17: Filler 19:
20: opening and closing member 21: support base 21a: through hole 22a: engaging hole 22: engaging support portion 23: shaft 23a: engaging hole 25:
30: Actuator 31: Pivot shaft 33: Fastening hole 33a: Fastening groove S: Snap ring 35:
The present invention relates to an elevator for an elevator for an elevator car which is provided with an elevator for elevating and lowering an elevator car, Cooperating projection 49b: second fastening projection 49c: auxiliary link
100: Variable air volume control with venturi shape.

Claims (5)

A housing 10 having a venturi portion 15 formed on an inner peripheral surface thereof;
A shaft 23 provided at the center of the inside of the housing 10 through a support 21 and an opening and closing adjusting cone 25 coupled to the shaft 23 to adjust the degree of opening and closing of the venturi 15. [ An opening and closing member (20);
An actuator 30 fixedly coupled to the outer periphery of the housing 10 so as to be connected to the supporter 21 in a state where the pivot 31 passes through the housing 10;
A guide hole 42 formed at one side of the elevation opening 41 and formed at one side of the elevation opening 41; A lifting and lowering engaging portion 45 which is engaged with and engaged with the guide hole 42 of the elevating guide 44 so as to be coupled to one end of the shaft 23; And the other side is rotatably coupled to the first fastening protrusion 43 so as to rotate the elevating guide 44 about the rotating shaft 31 And an operation link 47 for guiding the shaft 23 in the forward and backward directions according to the guide of the lifting and engaging part 45 coupled to the guide hole 42 of the elevation guide 44. [ ),
The opening and closing degree of the venturi portion 15 can be controlled by the opening and closing control cone 25 by forward and backward movement of the shaft 23 in accordance with forward and reverse rotation of the actuator 30, A variable air volume control device.
2. The actuator according to claim 1, wherein a coupling hole (33a) is formed at an end of the rotary shaft (31) of the actuator (30)
The support base (21) further includes a coupling support (22) having a coupling hole (22a) in which a coupling hole (33) is fitted,
Wherein the rotation shaft (31) is rotatably coupled to the support base (21) by a snap ring (S) fastened to the engagement groove (33a).
delete 2. The apparatus according to claim 1, wherein an end of the rotation shaft (31) further comprises a coupling step (35)
A coupling hole portion 47a having a shape corresponding to the coupling step 35 is further formed on one side of the operating link 47 formed in the interlocking transmission portion 40,
Wherein one side of the operating link 47 in which the engaging step 35 is fitted is provided adjacent to one side of the supporter 21 so as to be engaged by the engaging step 47 and the engaging hole 47a. Variable air volume control with shape.
2. The apparatus according to claim 1, wherein the interlocking transmission portion (40)
An interlocking protrusion 49a formed on the support 21;
A second fastening protrusion 49b formed on the elevating opening 41 so as to be symmetrical with respect to the first fastening protrusion 43 with respect to the guide hole 42;
An auxiliary operation means 49 constituted by an auxiliary link 49c whose one side is coupled to the interlocking projection 49a and the other side is coupled to the second fastening protrusion 49b to assist the operation of the operation link 47 And a variable air amount adjusting device having a venturi shape.
KR1020160026294A 2016-03-04 2016-03-04 A variable air volume control device on the venturi type KR101635420B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101884306B1 (en) * 2018-01-15 2018-08-01 서진공조주식회사 A device that adjusts the air volume by adjusting the damper installed on the body by the venturi differential pressur
KR102101655B1 (en) * 2019-10-21 2020-04-17 서진공조(주) Control system of venturi type variable air volume unit and method of the same
CN113879850A (en) * 2021-11-03 2022-01-04 山东联达制药有限公司 Intelligent medicine material transferring method and transferring device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001208415A (en) * 2000-01-26 2001-08-03 Matsushita Electric Ind Co Ltd Wind direction changing apparatus for air conditioner
KR100911156B1 (en) 2009-02-24 2009-08-06 서진공조 주식회사 Variable air volume regulation valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001208415A (en) * 2000-01-26 2001-08-03 Matsushita Electric Ind Co Ltd Wind direction changing apparatus for air conditioner
KR100911156B1 (en) 2009-02-24 2009-08-06 서진공조 주식회사 Variable air volume regulation valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101884306B1 (en) * 2018-01-15 2018-08-01 서진공조주식회사 A device that adjusts the air volume by adjusting the damper installed on the body by the venturi differential pressur
KR102101655B1 (en) * 2019-10-21 2020-04-17 서진공조(주) Control system of venturi type variable air volume unit and method of the same
CN113879850A (en) * 2021-11-03 2022-01-04 山东联达制药有限公司 Intelligent medicine material transferring method and transferring device
CN113879850B (en) * 2021-11-03 2022-05-03 山东联达制药有限公司 Intelligent medicine material transferring method and transferring device

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