KR101969578B1 - Valve being used as both check valve and electronic expansion valve and having selectable ports, and cooling and heating system - Google Patents

Abstract

The present invention relates to an electronic expansion valve serving as a check valve having a selectable port and an air conditioning and heating system. A main body housing having a first port formed at one side thereof and having a fluid inlet and outlet, a second port formed around a lower side of the first port, a second port through which the fluid enters and exits, and a lower end fastening hole formed at the lower end; A working assembly installed in an upper space in the main body housing and having a lifting and lowering rod; An orifice hole formed in a lower space in the main body housing through a lower end fastening hole and having at least one or more housing through holes formed around a second port and a flow path, an orifice hole formed in an upper end portion and a third port formed in a lower side The orifice hole is opened when the lifting rod is lifted and the orifice hole is opened when the lifting rod is lifted and a flow path is formed between the second or third port and the first port through the opened orifice hole, Performing an orifice assembly; And the second port is provided at an annular spacing space between the upper periphery of the repiece assembly and the inside of the main body housing. When the lifting rod is lowered, the flow through the annular spacing space of the fluid flowing through the first port is blocked, A check valve switching unit which allows a flow through the annular spacing space of the fluid flowing through the housing through-hole through the third port or through the third port, and performs a check valve function; And a port blocking unit installed at a selected one of the second and third ports and blocking the flow of the fluid through the installed port. Also, a cooling / heating system including the same is proposed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic expansion valve and an air conditioning and heating system,

The present invention relates to an electronic expansion valve serving as a check valve having a selectable port and an air conditioning and heating system. Specifically, an electronic expansion valve serving as a check valve having a selectable port capable of performing functions of an electronic expansion valve and a check valve according to a flow direction of a fluid and selecting a port according to an installation position, .

In general, valves are used to block fluid flow or to flow fluid. An expansion valve is a valve for reducing the pressure of a high-pressure fluid to a low pressure. Generally, it is used for discharging a high-temperature and high-pressure refrigerant at a low temperature and a low pressure in a cooling / heating air conditioner such as a high efficiency heat pump, an air conditioner and the like.

The electronic expansion valve of the expansion valve normally controls the degree of opening of the orifice by driving the stepping motor so as to control the refrigerant discharge amount or the inflow amount flowing into the valve chamber in some cases. In the electronic expansion valve, the needle or rod is lifted and lowered by rotation of the built-in step motor to open / close the refrigerant oil / gas inlet / outlet of the orifice. In a step motor, a rotor is driven by a coil to rotate in the forward and reverse directions, and the rotary motion is converted into a vertical motion of the shaft rod or the needle. The needle connected to the shaft rod moves up and down to control the opening degree of the orifice of the electronic expansion valve to control the flow rate of the refrigerant in the valve.

At this time, since the conventional electronic expansion valve has the orifice structure, it is difficult to maintain only the flow of the refrigerant in one direction and to perform the function of the two-way valve.

Therefore, in order to perform the function of the expansion valve in the forward flow and to perform the function of the check valve in the reverse flow, normally two pipes are formed, and each pipe is provided with an expansion valve and a check valve to selectively operate the two pipes .

Korean Utility Model Laid-Open Publication No. 20-1998-0060715 (published on November 5, 1998) Korean Patent Publication No. 10-2005-0037262 (published on April 21, 2005)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide an electronic expansion valve capable of performing a function of an electronic expansion valve and a function of a check valve according to a flow direction of a fluid and having a selectable port An electronic expansion valve serving as a check valve is proposed.

In order to solve the above problems, according to one aspect of the present invention, there is provided a method of manufacturing an ink jet recording head, comprising: forming a first port formed around one side and having a fluid in and out, a second port formed around a lower side than the first port, A body housing having a lower fastening hole; A working assembly installed in an upper space in the main body housing and having a lifting and lowering rod; An orifice hole formed in a lower space in the main body housing through a lower end fastening hole and having at least one or more housing through holes formed around a second port and a flow path, an orifice hole formed in an upper end portion and a third port formed in a lower side The orifice hole is opened when the lifting rod is lifted and the orifice hole is opened when the lifting rod is lifted and a flow path is formed between the second or third port and the first port through the opened orifice hole, Performing an orifice assembly; And the second port is provided at an annular spacing space between the upper periphery of the orifice assembly and the inside of the main body housing to shut off the flow through the annular spaced space of the fluid flowing through the first port when the lifting rod descends, A check valve switching unit that allows a flow through an annular spacing space of the fluid flowing through the housing through hole or through the third port and performs a check valve function; And a port blocking unit installed at a selected one of the second and third ports and blocking the flow of the fluid through the installed port.

At this time, in one example, the check valve switching unit includes: an annular valve seat provided in an annular spacing space between the first port and the second port and having at least one check valve hole penetrating the upper and lower portions along the annular shape; A check valve spring provided around the orifice assembly on the underside of the annular valve seat; And a hermetically sealed portion which is supported at one end by a check valve spring around the orifice assembly and performs shutoff and opening of the check valve hole in accordance with the pressure difference between the upper portion and the lower portion.

In yet another example, the annular valve seat may include an inner side insert hole formed by an inner side facing the upper periphery of the orifice assembly, an annular inner groove formed along the inner side, And the check valve switching unit is inserted into the annular inner groove and inserted into the inner sealing ring and the annular outer groove to maintain the airtightness with the orifice assembly so that the outer sealing ring, .

In addition, at this time, in another example, the main body housing includes a lower end fastening portion provided at the lower end side and having a lower end fastening hole, the other end of the check valve spring is supported on the lower end fastening portion, A center hole passing therethrough, an annular wing portion projecting outward in the horizontal direction and supported by one end of the check valve spring, and a gas tight sheet formed on the upper surface of the annular wing portion to maintain airtightness at the time of lowering the check valve hole.
For example, the orifice assembly may include: an adjuster housing having an orifice hole at the top and disposed in the upper space of the housing through-hole in the orifice housing so that the orifice hole is exposed through the top opening formed in the orifice housing; An orifice spring disposed within the adjuster housing; An orifice adjuster provided in the adjuster housing and elastically supported by an orifice spring, the orifice adjuster opening and closing the orifice hole by being lowered and raised by a pressing force by the descent of the lifting rod and an elastic force of the orifice spring; And a port unit installed at a lower end of the orifice housing and having a flow path used as a third port therein. At this time, at least a part of the periphery of the port unit and the lower periphery of the orifice housing can be fastened to the lower end fastening hole.
In addition, the orifice housing is inserted through the center hole of the airtight holding portion and the inner side insertion hole of the annular valve seat, and the airtightness with the annular valve seat is maintained by the inner sealing ring, and the housing through- You can communicate with me.

According to another example, the annular valve seat may further include a vertical protrusion vertically protruded so as to have an inner diameter larger than an inner side of the inner side, the upper and lower sides of the annular valve seat being stepped, A first annular groove may be formed around the orifice assembly along with the outer surface and a second annular groove may be formed around the orifice assembly with the outer surface of the orifice housing at the lower side of the inner side and the center hole of the airtight portion being lifted and inserted. The operation assembly further includes a rod guide housing having a guide hole penetrating the lifting rod to guide the lifting and lowering of the lifting rod and having a lower end inserted into the first annular groove and at least one flow hole formed around the lifting rod, The head portion protruding in the horizontal direction around the upper end of the lifting rod is caught on the upper peripheral surface of the guide hole and the maximum falling range may be limited.

In another example, the port blocking unit is provided so as to cover the lower opening side of the port unit when the third port is closed.

At this time, in another example, the orifice assembly further includes an assembly connector which is fastened to the lower side of the port unit and a fluid transmission net which is installed at the upper end of the port unit, and the assembly connector is fastened to the external piping when the third port is opened The port unit is fastened to a lower side of the port unit so that the port shutoff unit is installed in a space between the fastening portions with the port unit when the third port is shut off, and the adjuster housing is formed at the lower end to allow the fluid to pass therethrough and supports the lower end of the orifice spring Wherein the orifice adjuster comprises a support portion elastically supported on an upper end of the orifice spring and a support portion supported on an upper side of the support portion, So that the upper end is inserted into the orifice hole It said orifice may be provided to prevent the lower tapered hole portion.

Also, in one example, the actuation assembly comprises: a motor for providing a lifting power of the lifting rod; And a shaft rod having a male thread formed around the shaft and rotating in accordance with the rotation of the motor to move the lift rod up and down. The shaft lift rod is open to the upper side and has a female threaded shaft insertion groove. And is lifted and lowered in a non-rotating manner in accordance with the rotation of the shaft rod inserted into the shaft insertion groove.

At this time, in another example, the upper portion of the lifting rod is formed to project horizontally around the upper end, the lower end of the lifting rod has a downwardly projecting downwardly projecting portion, and the operating assembly includes a motor, a shaft rod, Further comprising: an assembly housing for receiving the upper portion of the rod; a decelerator connected to the motor for decelerating the rotation of the motor to transmit the reduced rotation to a lower shaft rod, the assembly housing having a shaft hole The upper end of the lift rod is received in the lower step space and the rising range of the lifting rod is limited by the step, and the downward-pointed end of the lifting rod receives the lower end of the orifice hole Press the top of the orifice adjuster that closes the orifice hole from the bottom and open the orifice hole All.

Further, in one example, the port blocking unit may be a connector cap for blocking the opening of the pipe connector connected to the second port, or a port cover for blocking the third port.

Next, in order to solve the above-mentioned problem, according to another aspect of the present invention, in an air conditioning system having an electronic expansion valve on a piping, an electronic expansion valve is provided, And an electronic expansion valve serving as a check valve having a selectable port according to one of the check valves.

According to one embodiment of the present invention, the function of the electronic expansion valve and the function of the check valve can be respectively performed according to the flow direction of the fluid.

Accordingly, without forming two pipelines as in the prior art in order to perform the function of the expansion valve and the function of the check valve according to the flow direction of the fluid, the check valve- By using an expansion valve, piping construction can be simplified. Further, the installation cost of the system can be reduced accordingly. In addition, the available ports can be selected according to the installation location, thus the restriction on the installation place is much reduced.

It will be understood by those skilled in the art that various other changes and modifications within the scope of the present invention may be made without departing from the spirit and scope of the invention as defined by the appended claims. It is obvious that it can be derived.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a cross-sectional view schematically showing a cross section of a state in which an electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention performs the function of an electronic expansion valve using a second port. Fig.
1B is a cross-sectional view schematically showing a cross-section of a state in which a check valve is functioning using a second port in an electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention.
FIG. 2A is a cross-sectional view schematically showing a cross-section of a state in which the electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention performs the function of an electronic expansion valve using a third port. FIG.
FIG. 2B is a cross-sectional view schematically showing a cross section of a state in which a check valve is functioning using a third port in an electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention. FIG.
3A is a schematic view illustrating an exploded view of an orifice assembly portion of a check valve and an electronic expansion valve having selectable ports according to one embodiment of the present invention.
FIG. 3B is a schematic view of a port unit and a fluid permeable net in the configuration of the orifice assembly in FIG. 3A.
4 is a view schematically showing the decomposition state of some components of the check valve switching unit and the operation assembly of the electronic expansion valve serving as a check valve having a selectable port according to one example of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the configuration of a first embodiment of the present invention; Fig. In the description, the same reference numerals denote the same components, and a detailed description may be omitted for the sake of understanding of the present invention to those skilled in the art.

In the present specification, when one element forms a coupling relation such as a coupling or coupling or a transmission relation such as transmission or transportation in relation to other elements, there is no 'direct' But also in the form of a coupling relationship or a transferring relation via an intermediary due to a relation of other components between them. The same is true of terms that include the meaning of 'contact' such as 'on', 'above', 'below', or 'below'. In addition, directional terms should be interpreted relative to the reference element.

It should also be noted that, although the present invention may be embodied in the singular, the present invention may be embodied in many other forms without departing from the spirit or scope of the inventions.

Furthermore, the words " comprising, " " comprising ", and the like, and the description of terms derived therefrom, are used in the present specification to indicate the possibility of adding, combining, or combining one or more other elements with the original element And does not exclude the use of the term " comprise ", the word " comprises ", and the words derived therefrom are also intended to be added to the original element or elements in addition to one or more other elements, Shall not preclude the possibility of the addition or combination of one or more of the other elements provided that the original elements or elements do not lose their features, functions and / or properties.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: FIG.

[Electronic expansion valve serving as a check valve having a selectable port]

An electronic expansion valve serving as a check valve having a selectable port according to an aspect of the present invention will be described in detail with reference to the drawings. Here, reference numerals not shown in the drawings to be referred to may be reference numerals in other drawings showing the same configuration. It should be noted that the configurations disclosed in the respective drawings may be omitted or modified in accordance with variations of the embodiments.

1A is a cross-sectional view schematically showing a cross-section of a state in which an electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention performs the function of an electronic expansion valve using a second port, Sectional view schematically showing a cross section of a state in which a check valve is functioning as a check valve using a second port in an electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention, Sectional view schematically showing a cross section of a state in which the electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention performs the function of an electronic expansion valve using a third port, Which performs the function of the check valve by using the third port in the electronic expansion valve serving as the check valve having the selectable port according to the embodiment of the present invention Sectional view schematically showing a cross-section of the wrist. FIG. 3A is a schematic view illustrating an exploded view of an orifice assembly constituent part of an electronic expansion valve serving as a check valve having a selectable port according to an embodiment of the present invention, and FIG. 3B is a cross- And a fluid transmission network. 4 is a view schematically showing the decomposition state of some components of the check valve switching unit and the operation assembly of the electronic expansion valve serving as a check valve having a selectable port according to one example of the present invention.

1A, 1B, 2A and / or 2B, a check valve and electronic expansion valve having a selectable port according to one example comprises a body housing 10, a working assembly 30, an orifice assembly 50, A valve switching unit 70 and a port blocking unit 90. At this time, the main body housing 10 has a first port 10a around one side, a second port 10b around the lower side of the first port 10a, and a lower end fastening hole 13a formed at the lower end. The operation assembly 30 includes a lifting rod 35 which is installed in an upper space in the main body housing 10 and which is operated to move up and down. The orifice assembly 50 is installed in the lower space in the main body housing 10 through the lower end fastening hole 13a. The orifice assembly 50 includes an orifice housing 51 formed with at least one housing through hole 51b surrounding the second port 10b and a flow path, an orifice hole 50a formed in the upper end, 3 port 10c. The orifice assembly 50 blocks the orifice hole 50a when the lifting rod 35 is lifted and opens the orifice hole 50a when the lifting rod 35 is lowered to perform the function of an expansion valve. The expansion valve function is performed by forming a flow path between the second or third port 10b, 10c and the first port 10a through the open orifice hole 50a. And the check valve switching unit 70 is installed in the annular spacing space between the periphery of the orifice assembly 50 and the inside of the main housing 10. [ At this time, the check valve switching unit 70 interrupts the flow through the annular spacing space of the fluid flowing through the first port 10a when the lifting rod 35 descends, and when the lifting rod 35 rises, Through the third through hole 10b or through the housing through hole 51b and through the annular spaced space of the incoming fluid and performs a check valve function. The port blocking unit 90 is installed in a selected one of the second and third ports 10c and blocks the flow of the fluid through the installed port.

Now, each configuration of a check valve-combined electronic expansion valve having a selectable port according to one example of the present invention will be described in detail. Hereinafter, a description will be given of a case where the main body housing 10, the operation assembly 30, the orifice assembly 50, the check valve switching unit 70, and the port And the blocking unit 90 are sequentially examined.

main body housing (10)

1A, 1B, 2A and / or 2B, the main body housing 10 includes a first port 10a formed on one side, a second port 10b formed around the lower side of the first port 10a, And a lower end fastening hole 13a formed in the upper end of the lower end fastening hole 13a. The first port 10a always has fluid in and out, and the second port 10b and the third port 10c can be a passage of fluid only selected one port. That is, the fluid may flow through the path between the first port 10a and the second port 10b, or may flow through the path between the first port 10a and the third port 10c. At this time, when the fluid flows through the path between the first port 10a and the second port 10b or the third port 10c, the electronic expansion valve with the check valve- When the function of the valve can be performed and the fluid flows through the path between the second port 10b or the third port 10c and the first port 10a, by the electronic expansion valve serving as a check valve according to the present invention The function of the check valve can be performed.

For example, the first port 10a and the second port 10b may be formed in different directions, or may be formed in the same or similar directions. And the third port 10c may be formed in the lower end direction of the main body housing 10. [ The position of the second port 10b is lower than that of the first port 10a. At this time, an annular valve seat 71 of a check valve switching unit 70, which will be described later, may be installed between the first port 10a and the second port 10b.

An operation assembly 30 is installed in an upper space in the main body housing 10 and an orifice assembly 50 is installed in a lower space through a lower end fastening hole 13a. For example, the mounting position of the operating assembly 30 may be higher than the position of the first port 10a or may be provided such that, for example, the flow hole 36b formed in the operating assembly 30 corresponds to the position of the first port 10a . The orifice assembly 50 is interchangeably fastened or coupled at the lower end of the body housing 10 so that the housing through hole 51b of the orifice assembly 50 corresponds to the position of the second port 10b The position of the second port 10b can be determined.

In one example, the body housing 10 includes a lower fastening portion 13. The lower end fastening portion 13 is provided on the lower end side of the main body housing 10 and has a lower end fastening hole 13a. For example, at least the lower periphery of the orifice housing 51 of the orifice assembly 50 and at least a portion of the periphery of the port unit 57 are inserted into the lower end fastening hole 13a of the lower end fastening portion 13 and the orifice assembly 50 And can be installed through the lower end fastening hole 13a. For example, the lower end fastening portion 13 is formed by connecting a coupling member 13c to the main body housing body 11 by welding or the like so that the lower end fastening portion body 13a having the inner side surface of the coupling member 13c and the lower end fastening groove 13a 13b may be male and female. At this time, a seal member 13d for sealing can be installed at the end of the lower end of the joint member 13c and the end of the lower end fastening body 13b. For example, the lower protruding periphery of the lower end fastening portion 13 may be fastened by, for example, a screw connection by the assembly connector 59 of the orifice assembly 50. In FIG. 3A, no screw thread is shown on the lower side of the lower fastening portion 13, but a bolt-nut coupling using the assembly connector 59 as a nut may be performed. 1A and 2B, in one example, the port cover 91, which is the port blocking unit 90, closes one end of the third port 10c formed by the inner flow path of the port unit 57, The assembly connector 59 is engaged and fastened on the lower periphery of the lower end fastening portion 13. Thereby, the third port 10c is shut off and the direction of the third port 10c is sealed and airtight.

For example, in one example, the main housing 10 has a housing cap 15, and the housing cap 15 can be coupled to the top of the housing body 11. For example, a screw thread may be formed around the upper end of the housing body 11, which is formed by machining one pipe, so as to be fastened to the inner surface thread of the housing cap 15. [ Alternatively, the joining portion 15a may be fixed and sealed around the upper end of the housing body 11 by welding, for example, brazing or the like, and the housing cap 15 may be screwed onto the joining portion 15a. At this time, a sealing means such as an O-ring or the like may be provided for sealing between the coupling portion 15a and the housing cap 15 to maintain airtightness.

The housing cap 15 of the main body housing 10 is screwed together with not only the upper end of the housing body 11 but also the protruding portion of the assembly housing 34 protruding from the main housing 10, 11, the assembly housing 34, and the housing cap 15, respectively. Thus, the operation assembly 30 can be replaced through disengagement of the housing cap 15, and after the pre-coupling operation assembly 30 of the housing cap 15 is inserted into the housing body 11, The operating assembly 30 can be fixedly coupled to the body housing 10 by screwing the cap 15, for example.

For example, the housing cap 15 is bent to cover the upper end of the main housing 10 and / or the upper end of the actuating assembly 30, and a connector 130, which supplies external power to the motor 31, So that the connecting portion can be formed. At this time, the housing cap 15 may be integrally formed with a connector 130 for supplying external power to the motor 31 in the connecting portion of the housing cap 15.

Referring to FIGS. 1A, 1B, 2A and / or 2B, piping is connected to the first port 10a and the second port 10b of the main body housing 10, or a piping connector 110 for piping connection is provided. Can be formed. The piping connector 110 can be fixed around the main body housing 10 by welding or the like and an electronic expansion valve serving as a check valve having a selectable port on the piping by connecting the piping to the other side of the piping connector 110 Can be installed. For example, referring to FIGS. 2A and 2B, a connector cap 93 is installed as a port blocking unit 90 in an opening of a piping connector 110 connected to a second port 10b, The flow of the fluid can be blocked. At this time, the piping connector 110 may be configured separately from the main housing 10, or may be a part of the main housing 10.

The main body housing 10 may be made of a metal such as copper or iron, or may be made of an alloy material such as stainless steel, copper, or an iron alloy.

For example, the housing body 11 of the body housing 10 may be formed of a single pipe. In this case, the upper and lower ends of the housing body 11 may have the same diameter or different diameters by drawing. For example, the first port 10a and the second port 10b may be formed on the housing body 11 formed of one pipe.

The actuating assembly (30)

Next, referring to Figs. 1A, 1B, 2A and / or 2B, the operation assembly 30 is provided with a lifting rod 35 installed in an upper space in the main body housing 10 and operated to move up and down. The orifice hole 50a of the orifice assembly 50 to be described later is blocked when the lifting rod 35 is lifted and the orifice hole 50a is opened when the lifting rod 35 is lowered. 1A and 2A, when the orifice hole 50a is opened according to the descent of the lifting rod 35, the second port 10b or the third port 10a is opened from the first port 10a through the orifice hole 50a, A charge to the second electrode 10c may be formed. At this time, the electronic expansion valve serving as a check valve having a selectable port according to the present invention operates as an electronic expansion valve.

1B and 2B, when the lifting rod 35 is in the lifted state, the orifice hole 50a of the orifice assembly 50 is shut off and the second port 10b or the third port 10c The orifice hole 50a is detoured from the second port 10b or the third port 10c, that is, from the selected one port, if the pressure of the fluid at the selected one port side is higher than that at the first port 10a side So that a flow path that flows to the first port 10a can be formed. At this time, the electronic expansion valve serving as a check valve having a selectable port according to the present invention operates as a check valve.

For example, the lifting power of the lifting rod 35 is provided by a motor 31 described later, and in one example, the lifting rod 35 is lifted up without rotation and can block and open the orifice hole 50a. The lower end of the lifting rod 35 pushes the upper end of the orifice adjuster 55 inserted into the orifice hole 50a below the orifice hole 50a from the upper side of the orifice hole 50a, Can be opened.

For example, referring to FIG. 4, the lifting rod 35 may include a head portion 35c formed to protrude horizontally around the upper end and a downwardly projecting portion 35b protruding downward. Further, it can be formed as a non-circular structure on the horizontal cut surface of the lifting rod 35. [

For example, in one example, the actuation assembly 30 may further include a motor 31 and a shaft rod 33 in addition to the lifting rod 35. [ At this time, the motor 31 provides the lifting power of the lifting rod 35. The lifting and lowering rod 35 is lifted and lowered in accordance with the rotation of the motor 31, so that the flow path can be blocked and opened. For example, the lifting and lowering of the lifting rod 35 can be performed according to the forward / reverse rotation of the motor 31. [ For example, when the motor 31 rotates in the normal direction, the lifting rod 35 is lowered and the lifting rod 35 can be raised or vice versa when the motor 31 rotates in the reverse direction. At this time, the rotation of the motor 31 can be converted into a rectilinear motion, so that the lifting and lowering rod 35 can be lifted and lowered. For example, the lifting and lowering rod 35 can be lifted and lowered without rotation. For example, the lifting rod 35 is engaged with the shaft rod 33 so that the rotational motion of the shaft rod 33 in accordance with the rotation of the motor 31 can be switched to the upward / downward movement of the lifting rod 35. For example, the motor 31 may be a stepping motor.

The shaft rod 33 rotates in accordance with the rotation of the motor 31. At this time, the lifting and lowering rod 35 can be lifted and lowered in accordance with the rotation of the shaft rod 33. The shaft rod 33 rotates in accordance with the rotation of the motor 31 and lifts the lifting rod 35. At this time, the combination of the shaft rod 33 and the lifting rod 35 converts the rotational motion into a linear motion. For example, a male thread is formed around the shaft rod 33 to form a threaded engagement with the lift rod 35, and the rotation of the shaft rod 33 causes the lift rod 35 to move up and down . At this time, the lifting rod 35 is provided with a shaft insertion groove 35a having an inner thread surface and an open upper side, and the shaft rod 33 inserted into the shaft insertion groove 35a is rotated, (35) can move up and down without rotation. At this time, since the horizontal cutting surface of the lifting rod 35 is formed into a non-circular structure, the lifting and lowering can be performed without rotating.

For example, referring to Figs. 1A, 1B, 2A, 2B and / or 4, the actuating assembly 30 may further comprise a rod guide housing 36. The rod guide housing 36 has a guide hole 36a and at least one flow hole 36b around the guide hole 36a. For example, the guide hole 36a of the rod guide housing 36 penetrates the lifting rod 35 and can guide the lifting and lowering of the lifting rod 35. That is, the guide hole 36a is formed as a non-circular structure on the horizontal cut surface corresponding to the cross-sectional shape of the lifting rod 35, so that the lift of the lifting rod 35 is blocked and only the lifting and lowering can be guided. Thus, the lifting and lowering rod 35 can be lifted and lowered along the guide hole 36a without rotation. For example, when the lifting rod 35 is lowered, the head 35c protruding in the horizontal direction around the upper end of the lifting rod 35 is caught on the upper peripheral surface of the guide hole 36a, and the maximum falling range may be limited .

The fluid that has passed through the orifice hole 50a during the operation of the electronic expansion valve flows through the second port 10b or the third port 10c through the at least one flow hole 36b formed around the rod guide housing 36, The fluid flowing from the second port 10b or the third port 10c flows around the upper portion of the orifice assembly 50 through the flow hole 36b and flows through the check valve switching And can flow toward the first port 10a side through the check valve hole 71a of the unit 70. [

The rod guide housing 36 may also be inserted into the first annular groove formed by the outer circumferential surface of the orifice assembly 50 and the annular valve seat 71 of the check valve switching unit 70 which will be described later. The first annular groove can be formed by the vertical protrusion 71d and the outer peripheral surface of the orifice housing 51 on the upper side of the inner side surface of the annular valve seat 71. [ At this time, the head portion 35c protruding in the horizontal direction around the upper end of the lifting rod 35 when the lifting rod 35 descends is caught on the upper peripheral surface of the guide hole 36a, and the maximum falling range is limited . The limit of the maximum descending range of the lifting rod 35 by the rod guide housing 36 is such that the downwardly protruding portion 35b of the lifting rod 35 exceeds the opening of the orifice hole 50a when the lifting rod 35 is over- It is possible to prevent the result of cutting off the orifice hole 50a. For example, the rod guide housing 36 may be inserted into the lower end portion of the assembly housing 34 to be described later, and form an operation restriction space of the lifting rod 35 together with the assembly housing 34. Although not shown, the rod guide housing 36 and the assembly housing 34 described later may be integrally formed.

Further, in one example, the actuation assembly 30 may further include an assembly housing 34 and a speed reducer 32. The assembly housing 34 can house the motor 31, the shaft rod 33 and at least the top of the lifting rod 35. The decelerator 32 is connected to the motor 31 and decelerates the rotation of the motor 31 to transmit the decelerated rotation to the shaft rod 33 connected to the lower side. 1A, 1B, 2A, 2B, and 4, an upper portion of the lifting rod 35 at least accommodated in the assembly housing 34 includes a head portion 35c formed to protrude horizontally around the upper end thereof. . For example, the assembly housing 34 has a step 34b formed therein so as to form a shaft hole 34a through which the shaft rod 33 penetrates, and the reducer 32 is received in the upper space and the lower space 34d The upper portion of the lifting rod 35, that is, the head portion 35c, can be accommodated in the lifting rod 35 and the lifting rod 35 can be restricted by the step 34b. In addition, the protrusion-shaped step 34b protruding inwardly is provided with the fluid passage hole 34c to allow the upper space and the lower space 34d to communicate with each other, so that the lifting rod 35 can be smoothly moved up. The rod guide housing 36 is screwed to the lower end of the assembly housing 34 and the lower space 34d of the assembly housing 34 and the upper surface of the rod guide housing 36 That is, the head portion 35c, can move up and down. The upper end of the shaft rod 33 is connected to the speed reducer 32 through the shaft hole 34a and the tip portion of the shaft rod 33 protruded downward through the shaft hole 34a is connected to the upper portion of the lift rod 35 The shaft insertion hole 35a can be inserted into the shaft insertion groove 35a.

1A, 1B, 2A, 2B and / or 4, the lower end of the lifting rod 35 may have a downwardly projecting downwardly projecting portion 35b. 1A and 2A, the downwardly projecting portion 35b is formed at the lower end of the orifice hole 50a in accordance with the lowering of the lifting rod 35. In this case, The orifice hole 50a can be opened.

For example, the assembly housing 34 may be hermetically mounted within the body housing 10. The assembly housing 34 may be secured to the interior of the body housing 10 by brazing, for example. At this time, the lower end of the assembly housing 34 is screwed to the rod guide housing 36 to form a space for restricting the elevating operation of the lifting rod 35, and the upper end of the assembly housing 34 is connected to the housing cap 15 and can be hermetically mounted inside the main housing 10. For example, the lower end of the assembly housing 34 is formed with an internal thread on the inner side, and the upper end of the rod guide housing 36 is formed with male threads on the outer side to be screwed.

For example, the assembly housing 34 may be formed to have a stepped shape and become narrower toward the lower side. At this time, the outer diameter of the uppermost end is matched with the inner diameter of the main body housing 10, and the outer diameter of the outer diameter gradually increases between the inserting section of the motor 31 and the inserting section of the speed reducer 32, Can be reduced.

Orifice  The assembly (50)

Next, the orifice assembly 50 will be described with reference to Figs. 1a, 1b, 2a, 2b and / or 3a. The orifice assembly 50 is installed in the lower space in the main body housing 10 through the lower end fastening hole 13a. The orifice assembly 50 includes an orifice housing 51, an orifice hole 50a and a third port 10c. At least one housing through hole 51b is formed around the orifice housing 51 to form a second port 10b and a flow path. For example, the lower periphery of the orifice housing 51 is coupled to the lower end fastening hole 13a. An orifice hole (50a) is formed in the upper end of the orifice assembly (50). For example, although not shown, the upper end of the orifice housing 51 may be covered leaving only the orifice hole 50a, and in another example, the orifice housing 51 may be covered, as in Figures 1a, 1b, 2a and / An orifice hole 50a may be formed at the upper end of the adjuster housing 52 inserted into the orifice hole 52a. Also, the orifice assembly 50 has a third port 10c formed in the lower side thereof.

The orifice housing 51 includes at least one housing through hole 51b and the housing through hole 51b and the orifice hole 50a are formed in the first port 10a and the second port 10b, A flow path between the port 10a and the third port 10c can be formed. At this time, the flow path from the first port 10a to the second port 10b or the third port 10c through the housing through hole 51b and the orifice hole 50a is a check having a selectable port according to the present invention And is a flow path formed when the electronic expansion valve of the combined electronic expansion valve functions. For example, the position of the housing through-hole 51b may be arranged substantially in the same height range as the second port 10b of the main body housing 10. [ The shape of the housing through hole 51b need not be limited to a circular shape, and various shapes are possible.
For example, the orifice housing 51 is inserted through the center hole 75a of the airtight holding portion 75 described later and the inner side insertion hole of the annular valve seat 71, and is inserted into the annular valve seat 71 by the inner sealing ring 72a. The housing through hole 51b can communicate with the inside of the orifice housing 51 by the second port 10b side.

Referring to FIGS. 1B and 2B, the orifice assembly 50 cuts off the orifice hole 50a when the lifting rod 35 is lifted. When the lifting rod 35 is lowered, the orifice hole 50a ). 1A and 2A, the orifice assembly 50 forms a flow path between the second or third ports 10b and 10c and the first port 10a through the opened orifice hole 50a, And functions as a valve. For example, the orifice assembly 50 may be interchangeably inserted into the lower space within the body housing 10. The orifice assembly 50 can be screwed into a lower portion of the main body housing 10 so that the orifice assembly 50 can be inserted and replaced from the lower side of the main body housing 10.

For example, referring to Figures IA, IB, 2A, 2B and / or 3A, in one example, orifice assembly 50 includes an orifice housing 51, an adjuster housing 52, an orifice spring 53, (55) and a port unit (57). Further, in one example, the orifice assembly 50 may further include an assembly connector 59 and a fluid-permeable net 58.

The adjuster housing 52 includes an orifice hole 50a at the top and an orifice hole 50a at the top to expose the orifice hole 50a through the top opening 51a formed in the orifice housing 51, (51b) in the housing through hole (51b). For example, the adjuster housing 52 has a spring support 152 for supporting the lower end of the orifice spring 53 at its lower end. The spring support 152 is formed to allow fluid to pass therethrough. The spring support 152 has an adjuster guide hole 152a for guiding the lift of the orifice adjuster 55. A lower end portion of the orifice adjuster 55 is inserted into the adjuster guide hole 152a to lift up.

An orifice spring (53) is provided in the adjuster housing (52). The orifice spring 53 elastically supports the orifice adjuster 55 within the adjuster housing 52. For example, the other end of the orifice spring 53 is supported by an assembly connector 59 to be described later, and one end supports the orifice adjuster 55.

The orifice adjuster 55 is installed in the adjuster housing 52. At this time, the orifice adjuster 55 is elastically supported by the orifice spring 53 and descends and rises by the pressing force by the descent of the lifting rod 35 and the elastic force of the orifice spring 53, Open and shut off. Referring to FIGS. 1A and 2A, the orifice adjuster 55 is retracted downward when the lifting rod 35 descends to open the orifice hole 50a. Referring to FIGS. 1B and 2B, when the lifting rod 35 is lifted And is lifted by the elastic force of the orifice spring 53 to cut off the orifice hole 50a.

The opening of the orifice hole 50a by the orifice adjuster 55 is stopped by the elastic force of the orifice spring 53 in accordance with the rise of the lifting rod 35 due to the reverse rotation or the forward rotation of the motor 31, Or when the motor 31 is driven off the shaft rod 33 idles and the orifice adjuster 55 is lifted by the elastic force of the orifice spring 53 so that the lift rod 35 It can be pushed up.

In one example, the orifice adjuster 55 may include a support portion 55b and a tapered portion 55a. For example, at this time, the support portion 55b and the tapered portion 55a may be integrally formed. The support portion 55b is resiliently supported at the upper end of the orifice spring 53. The tapered portion 55a includes a conical columnar shape on the upper side of the support portion 55b. When the tapered portion 55a rises, the upper end portion is inserted into the orifice hole 50a and blocks the lower side of the orifice hole 50a. For example, the upper end surface of the tapered portion 55a may be provided with a receiving groove on which the tip of the lifting rod 35 is seated.

For example, the orifice hole 50a is opened and closed when the orifice spring 55 is lowered and lifted by the lowering of the lifting rod 35 and the elastic force of the orifice spring 53, The rotation speed or the forward / reverse rotation speed is controlled and the down / up / down speed of the orifice adjuster 55 can be controlled. Alternatively, the orifice adjuster 55 can be lowered and elevated step by step using a step motor or the like. Also, in one example, the amount of fluid may be adjusted by stepwise adjusting the descending and ascending / descending height of the orifice adjuster 55 in accordance with the step adjustment.

The port unit 57 is installed at the lower end of the orifice housing 51. At this time, the port unit 57 has a flow path used as a third port 10c. At this time, at least a part of the periphery of the port unit 57 and the lower periphery of the orifice housing 51 are fastened to the lower end fastening hole 13a. 1A and 1B, the port blocking unit 90 may be installed to cover the lower opening side of the port unit 57 when the third port 10c is cut off. 2A and 2B, when the third port 10c is opened, the port blocking unit 90, for example, the port cover 91 is not provided on the third port 10c side, and the second port 10b The connector cap 93 may be provided. For example, referring to FIG. 3B, a fluid transmission network 58, which will be described later, may be installed above the port unit 57.

Further, in one example, the orifice assembly 50 may further include an assembly connector 59 and a fluid-permeable net 58. The assembly connector 59 is fastened to the lower side of the port unit 57. At this time, an external piping (not shown) is connected to the assembly connector 59 when the third port 10c is opened. On the other hand, when the third port 10c is shut off, a port shutoff unit 90, for example, a port cover 91, is installed in a space between the assembly connector 59 and the port unit 57. For example, the assembly connector 59 can be screwed to the lower end fastening portion 13 of the body housing 10 while being fastened to the lower side of the port unit 57. As a result, the orifice assembly 50 can be inserted and replaced from the lower side of the main body housing 10.

Referring to FIG. 3B, the fluid transmission net 58 is installed above the port unit 57. The fluid permeable net 58 allows fluid flowing from the third port 10c or fluid flowing to the third port 10c.

The check valve switching unit 70,

Next, the check valve switching unit 70 will be described with reference to Figs. 1A, 1B, 2A and / or 2B. The check valve switching unit 70 is installed in an annular spacing space between the periphery of the orifice assembly 50 and the inside of the main housing 10. [ 1A and 2A, the check valve switching unit 70 blocks the flow through the annular spacing space of the fluid flowing through the first port 10a when the lifting rod 35 descends, When the lifting rod 35 rises, it allows the flow through the annular spacing space of the fluid flowing through the second port 10b or through the housing through-hole 51b through the third port 10c Perform check valve function. At this time, the check valve function is performed when the orifice hole 50a is closed by the lifting rod 35 rising.

For example, in one example, the check valve switching unit 70 may include an annular valve seat 71, a check valve spring 73 and a hermetic seal portion 75. Further, in one example, the check valve switching unit 70 may further include an inner sealing ring 72a and an outer sealing ring 72b. Let's look at each configuration in detail.

1a, 1b, 2a, 2b and / or 4, the annular valve seat 71 is installed in an annular spaced-apart space between the first port 10a and the second port 10b. At least one check valve hole 71a is formed in the annular valve seat 71 so as to pass through the upper and lower portions along the annular shape. For example, the check valve hole 71a may be an annular arc-shaped structure formed along the annular shape, but is not limited thereto. For example, referring to FIG. 4, the check valve hole 71a may be formed in an annular arc shape along the periphery of a vertical protrusion 71d described later.

Further, in one example, the annular valve seat 71 may further include an annular inner groove 71b and / or an annular outer groove 71c. The annular inner groove 71b is formed along the periphery of the orifice assembly 50, for example, along the inner surface facing the outer peripheral surface of the orifice housing 51. [ At this time, the inner side surface of the annular valve seat 71 facing the outer circumferential surface of the orifice housing 51 forms an inner side insertion hole into which the orifice assembly 50 is inserted. The annular outer groove 71c is formed along the outer surface facing the inside of the main housing 10. [ At this time, the inner sealing ring 72a is inserted into the annular inner groove 71b to keep the airtightness with the orifice assembly 50, and the outer sealing ring 72b is inserted into the annular outer groove 71c, And can maintain the confidentiality. The orifice assembly 50 is inserted through the inner side insertion hole formed in the inner surface of the annular valve seat 71.

The annular valve seat 71 is allowed to flow through the second port 10b or the third through hole 51b and the housing through hole 51b in combination with the hermetic seal portion 75 described later To block flow through the annular spacing space of the fluid entering through the first port 10a and to flow through the annular spacing space of the fluid entering through the first port 10a with reference to Figures 1b and 2b.

For example, in one example, the annular valve seat 71 may further include a vertical protrusion 71d. The vertical protrusion 71d is vertically protruded so as to have a larger stepped inner diameter than the inner side surface of the inner surface of the orifice housing 51, which faces the upper and lower sides of the orifice housing 51, respectively. At this time, the vertical protrusion 71d forms a first annular groove around the orifice assembly 50 together with the outer surface of the orifice housing 51 on the inner side, and the outer surface of the orifice housing 51 The second annular groove in which the periphery of the center hole 75a of the airtight holding portion 75 is lifted and inserted can be formed around the orifice assembly 50. [ At this time, the lower end of the rod guide housing 36 may be inserted into the first annular groove. The rod guide housing 36 in which the lower end is inserted into the first annular groove has a guide hole 36a through which the lifting rod 35 penetrates at the upper end to guide the lifting and lowering of the non-rotating shaft.

On the other hand, the check valve spring 73 is installed around the periphery of the orifice assembly 50, e.g., the orifice housing 51, below the annular valve seat 71. For example, the other end of the check valve spring 73 may be supported on the lower end fastening portion 13 of the main body housing 10. [

The hermetic seal portion 75 is supported at one end by a check valve spring 73 around the orifice assembly 50. The hermetic-sealing portion 75 performs blocking and opening of the check valve hole 71a in accordance with the pressure difference between the upper portion and the lower portion with respect to the hermetic-sealing portion 75. At this time, the pressure difference between the upper and lower portions is a difference in which the pressure due to the elastic force of the check valve spring 73 applied under the airtightness maintaining portion 75 is considered together.

For example, in one example, the airtightness maintaining portion 75 includes the center hole 75a, the annular wing portion 75b, and the airtight sheet 75c. At this time, the orifice assembly 50 passes through the center hole 75a. The annular wing portion 75b protrudes outward in the horizontal direction and is supported by one end of the check valve spring 73. The airtight sheet 75c is formed on the upper surface of the annular wing portion 75b to maintain the airtightness at the time of closing the lower portion of the check valve hole 71a.

The port blocking unit (90)

The port blocking unit 90 is installed in a selected one of the second and third ports 10b and 10c and blocks the flow of the fluid through the installed port.

In one example, the port blocking unit 90 is a connector cap 93 for blocking the opening of the piping connector 110 connected to the second port 10b, or a port cover (not shown) for blocking the third port 10c 91).

[Heating and cooling system]

Next, a cooling / heating system according to another embodiment of the present invention will be described in order to solve the above-mentioned problems. An air conditioning system according to one example of the present invention includes an electronic expansion valve on a piping. At this time, the electronic expansion valve may be an electronic expansion valve serving as a check valve having a selectable port according to any one of the embodiments of the above-described aspects of the present invention. The detailed explanation of the electronic expansion valve serving as a check valve having a selectable port is replaced by the above-described explanations. The electronic expansion valve serving as a check valve having a selectable port according to the embodiments of the present invention described above can perform the check valve function as well as the main function of the electronic expansion valve according to the control, The cost can be reduced. Since a piping structure for causing a pipeline that performs an electronic expansion valve function and a pipeline that performs a check valve function to flow through a pipeline and that allows a fluid to flow to any one pipeline under control is well known in the art, According to the present invention, it is possible to reduce the number of conventional parallel pipeline structures to one channel and to provide an electronic expansion valve serving as a check valve having a selectable port according to the present invention on the pipeline. Therefore, a detailed description of the piping structure capable of reducing the number of the two pipelines to one pipeline by including the electronic expansion valve serving as a check valve having the selectable port according to the present invention will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. At this time, various modifications may be obviously implemented according to various combinations of the above-described components by those skilled in the art. That is, various embodiments of the present invention may be embodied in various modified forms according to various combinations of the above-described elements without departing from the essential characteristics of the present invention. Accordingly, the scope of the present invention should be construed in accordance with the invention as set forth in the appended claims, along with various modifications, alternatives, and equivalents by those skilled in the art, as well as the embodiments described above.

10: main body housing 10a: first port
10b: second port 10c: third port
13: lower end fastening part 15: housing cap
30: actuating assembly 31: motor
32: Reducer 33: Shaft rod
34: assembly housing 35: lifting rod
35a: shaft insertion groove 35b: downwardly pointed portion
35c: head portion 36: rod guide housing
36a: guide hole 36b: channel hole
50: Orifice assembly 50a: Orifice hole
51: Orifice housing 51a: opening
51b: housing through hole 52: adjuster housing
53: Orifice spring 55: Orifice adjuster
57: Port unit 58: Fluid transmission network
59: Assembly connector 70: Check valve switching unit
71: annular valve seat 71a: check valve hole
72a: inner sealing ring 72b: outer sealing ring
73: Check valve spring 75:
90: Port blocking unit 91: Port cover
93: Connector cap 110: Piping connector

Claims (11)

A main body housing having a first port formed around one side thereof and having a fluid inlet and outlet, a second port formed around the lower side of the first port, a second port through which the fluid enters and exits, and a lower end fastening hole formed at the lower end;
A working assembly installed in an upper space in the main body housing and having a lifting and lowering rod;
An orifice hole formed in the lower space of the main body housing through the lower end fastening hole and having at least one or more housing through holes for forming the second port and the flow path around the orifice hole, Wherein the orifice hole is closed when the lifting rod is lifted and the orifice hole is opened when the lifting rod is lifted and the lifting rod is opened through the opened orifice hole and between the second or third port and the first port An orifice assembly that functions as an expansion valve by forming a flow path of the expansion valve;
And an annular spaced space between the upper periphery of the orifice assembly and the inside of the main housing for blocking flow through the annular spaced space of the fluid flowing through the first port when the lifting rod is lowered, A check valve switching unit which permits flow through the annular spaced space of the fluid entering through the second port or through the housing through hole when the load rises, ; And
And a port blocking unit installed at a selected one of the second and third ports and blocking the flow of the fluid through the installed port,
Wherein the check valve function is performed when the orifice hole is blocked due to the rise of the lifting rod,
Wherein the check valve switching unit comprises: an annular valve seat provided in the annular spacing space between the first port and the second port and having at least one check valve hole penetrating upper and lower portions along an annular shape; A check valve spring provided around the orifice assembly below the annular valve seat; And a hermetic retaining portion that is supported at one end by the check valve spring around the orifice assembly and performs blocking and opening of the check valve hole in accordance with a pressure difference between the upper portion and the lower portion,
The annular valve seat comprises an inner side insert hole formed by an inner side facing the upper circumference of the orifice assembly, an annular inner groove formed along the inner side, and an annular outer side formed along the outer side facing the inner side of the main housing Grooves,
Wherein the check valve switching unit further comprises an inner sealing ring inserted in the annular inner groove to maintain a hermetic seal with the orifice assembly and an outer sealing ring inserted in the annular outer groove to maintain airtightness with the body housing,
The airtightness maintaining portion includes a center hole through which the orifice assembly passes, an annular wing portion protruding outward in the horizontal direction and supported by one end of the check valve spring, and an airtight portion formed on the upper surface of the annular wing portion, And an airtight sheet for holding the airtight sheet,
The orifice assembly comprising: an adjuster housing having the orifice hole at an upper end thereof and disposed in the space above the housing through hole in the orifice housing so that the orifice hole is exposed through an upper opening formed in the orifice housing; An orifice spring disposed within the adjuster housing; An orifice adjuster provided in the adjuster housing and resiliently supported by the orifice spring, the orifice adjuster being opened and closed by a downward force of the downward movement of the lifting rod and a downward movement of the orifice by the elastic force of the orifice spring; And a port unit installed at a lower end of the orifice housing, the port unit being used as the third port,
At least a part of the periphery of the port unit and the lower periphery of the orifice housing are fastened to the lower end fastening hole,
Wherein the orifice housing is inserted through the center hole of the hermetic holder and the inner side insert hole of the annular valve seat and is sealed by the inner seal ring to the annular valve seat,
And said housing through-hole communicates said second port side with the inside of said orifice housing.
delete delete In claim 1,
Wherein the main body housing includes a lower end fastening portion provided at a lower end side and having a lower end fastening hole,
And the other end of the check valve spring is supported on the lower end fastening portion.
In claim 4,
Wherein the annular valve seat further comprises a vertical protrusion that is vertically protruded to have a larger inner diameter than the inner side of the inner side surface,
The vertical protrusion forms a first annular groove around the orifice assembly along with the outer surface of the orifice housing on the inner side and forms a first annular groove around the center hole of the hermetic holder with the outer surface of the orifice housing A second annular groove to be lifted and inserted is formed around the orifice assembly,
Wherein the operation assembly further comprises a rod guide housing having a guide hole passing through the lifting rod to guide the lifting and lowering of the lifting rod, a lower end inserted into the first annular groove,
Wherein a head portion protruding in a horizontal direction around an upper end of the lifting rod when the lifting rod descends is caught on an upper peripheral surface of the guide hole and a maximum falling range is limited, .
The method according to any one of claims 1, 4 and 5,
And the port blocking unit is installed so as to cover a lower opening side of the port unit when the third port is shut off.
In claim 6,
Wherein the orifice assembly further comprises an assembly connector coupled to a lower side of the port unit and a fluid permeable net disposed at an upper end of the port unit,
Wherein the assembly connector is fastened to the port unit when the third port is opened and the port blocking unit is installed in a space between the fastening portions of the port unit when the third port is closed,
Wherein the adjuster housing includes a spring support portion formed at a lower end portion for allowing the fluid to pass therethrough and supporting a lower end of the orifice spring,
Wherein the spring support portion includes an adjuster guide hole into which a lower end of the orifice adjuster is inserted so as to guide the lift of the orifice adjuster,
Wherein the orifice adjuster includes a support portion elastically supported at an upper end of the orifice spring and a tapered portion formed at an upper side of the support portion in a cylindrical shape and having an upper end inserted into the orifice hole when lifted, The electronic expansion valve serving as a check valve having a selectable port.
The method according to any one of claims 1, 4 and 5,
The operating assembly comprising:
A motor for providing a lifting power of the lifting rod; And
Further comprising: a shaft rod having a male screw thread formed around the shaft and rotating with the rotation of the motor to elevate the lift rod,
Wherein the lift rod has a non-circular structure with a horizontal cut surface opened to an upper side and has a female threaded shaft insertion groove, and is free to lift and lower according to the rotation of the shaft rod inserted into the shaft insertion groove. An electronic expansion valve serving as a check valve.
In claim 8,
The upper portion of the lifting rod is formed to project horizontally around the upper end. The lower end of the lifting rod has a downwardly projecting downwardly protruding portion,
Wherein the operating assembly includes an assembly housing for receiving the motor, the shaft rod, and at least the top of the lift rod, and a reduction gear assembly coupled to the motor, Further comprising a speed reducer,
Wherein the assembly housing is formed with a step to form a shaft hole through which the shaft rod penetrates, the housing housing the reducer in a space above the step, accommodate the upper portion of the lift rod in the step lower space, Limiting the rising range of < RTI ID =
Wherein the downwardly projecting portion pushes the upper end of the orifice adjuster closing the orifice hole at a lower side of the orifice hole in accordance with the descent of the lifting rod, thereby opening the orifice hole.
The method according to any one of claims 1, 4 and 5,
Wherein the port blocking unit is a connector cap for blocking an opening of a piping connector connected to the second port or a port cover for blocking a third port.
In an air conditioning system having an electronic expansion valve on a piping,
Wherein the electronic expansion valve is an electronic expansion valve serving also as a check valve having a selectable port according to any one of claims 1, 4 and 5.

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