WO2019124940A1 - Electronic expansion valve and cooling/heating system - Google Patents

Abstract

The present invention relates to an electronic expansion valve and a cooling/heating system. According to an example, proposed is an electronic expansion valve comprising: a body housing having a first port; an operation assembly installed inside the body housing, the operation assembly comprising an operation housing having a guide hole, a rotation driving portion, and an elevating rod which receives rotation power from the rotation driving portion and accordingly moves upward/downward without rotating so as to penetrate the guide hole; and a replaceable orifice unit installed on the lower portion of the operation assembly such that the same can be replaced through the lower end of the body housing, the replaceable orifice unit comprising an orifice housing which exposes an orifice hole and an orifice set which opens/closes the orifice hole inside the orifice housing according to downward and upward movements of the elevating rod such that an expansion valve function is performed, wherein the operation housing has an upward/downward movement constraint space formed in the upper portion of the guide hole, and the operation assembly further comprises an upward movement limit adjusting element installed in the upward/downward movement constraint space so as to adjust the upward movement limiting height of the elevating rod.

Description

Electronic expansion valve and heating and cooling system

The present invention relates to an electronic expansion valve and a cooling / heating system. Specifically, the present invention relates to an orifice replacement type electronic expansion valve, and a cooling and heating system using the same.

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. In the electronic expansion valve, the 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 stepper motor, the rotor is driven by the coil and rotates in the forward and reverse directions, and the rotary motion is converted into upward and downward movement of the rod or needle to open the orifice.

A technique for replacing an orifice of an electronic expansion valve has been proposed so that it can be applied to various fluid and pipe pressure characteristics. At this time, various orifice assemblies may be replaced to adapt to various fluid and piping pressure characteristics, and the orifice through height or protrusion height of the adjuster or needle for shutting off and opening the orifice depending on the orifice assembly may be changed. Accordingly, although the range of the lifting section of the rod or needle that vertically moves up and down in order to open and shut off the orifice must be changed, the conventional techniques have to be repeatedly used for a long period of time in a fixed range of the lifting section.

 Depending on the orifice assembly to be replaced, the precision of the control of the electronic expansion valve may deteriorate if it is repeatedly used for a long time without adjusting the range of the elevation range.

In order to solve the above-described problems, the present invention proposes an electronic expansion valve capable of adjusting an ascent height so as to have an appropriate range of elevation intervals in accordance with replacement of an orifice in an orifice replaceable electronic expansion valve.

According to one aspect of the present invention, there is provided a portable terminal comprising: a main body housing having a first port formed around the main body; An operation housing provided in the main body housing and having a guide hole therein, a rotation drive unit installed in an upper space of the operation housing, and a lift and rotation unit installed in a lower portion of the rotation drive unit, receiving rotation power of the rotation drive unit, An actuating assembly including a rod; And an orifice housing which is provided in the lower portion of the operation assembly in the body housing to be replaceable through the lower end of the body housing and which functions to expose the orifice hole at the upper center and the expansion valve, Wherein the actuating housing is provided with a rising / restricting space at an upper portion of the guide hole, and the actuating assembly is installed in a space for restricting the lifting / lowering of the lift rod, And an elevation limit adjuster for adjusting the elevation limit height.

In this case, in one example, the rotation drive unit includes a shaft rod that rotates in accordance with rotation of the motor and the motor and has a thread formed around the shaft, the lift hole has a non-circular horizontal cross- The shaft rod is provided with a rod engaging groove to which the shaft rod is screwed, so that it can be lifted and lowered in a non-rotating manner in accordance with the rotation of the shaft rod fastened to the rod engaging groove. The elevation limit adjuster includes a height adjusting portion formed along the edge and screwed to the inner circumferential surface of the enlarged elevation restraint space at the upper end of the guide hole, a ceiling portion defining the elevation limit of the elevating rod and a shaft portion formed at the center of the ceiling portion. A rod through hole may be provided.

At this time, in another example, the height adjusting portion has a plurality of adjusting grooves formed from the lower side to the upper side along the edge, and the operating housing has a plurality of through-holes penetrating the outside of the operating housing, The elevation limit height can be adjusted by rotating the elevation limit adjuster through the adjustment groove exposed through the through-hole.

In this case, in one example, the operating housing includes a guide housing having a guide hole formed therein and having at least one first flow hole communicating with a first port around a lower side of the guide hole, The driving unit housing has protrusions protruding from a lower inner circumferential surface of the driving unit housing to limit the elevation height of the elevation limit adjuster and form a rising and restraining space together with the upper end of the guide housing. .

Further, in one example, the rotation driving unit may further include a speed reducer connected to the motor and configured to decelerate the rotation of the motor to transmit the reduced rotation to the shaft rod. The hoisting rods are protruded in the horizontal direction around the upper end, A load body disposed in the lower elevating and holding space, a rod body connected to a lower portion of the load head and having a non-circular horizontal cross-sectional structure, and a downwardly projecting portion projecting downward from a lower end of the rod body.

In another example, the electronic expansion valve is provided with an internal sealing ring on the inner side facing the upper circumference of the replaceable orifice unit, which is installed in an annular spaced-apart space between the upper periphery of the replaceable orifice unit and the inside of the main housing, And an annular unit that maintains the airtightness of the annular spacing space when the hole is opened. In addition, the lower end fastening portion may be provided at the lower end of the main body housing, and the lower end fastening portion may have a lower end hole through which the replaceable orifice unit is supported.

At this time, in one example, the main body housing further includes a second port formed around the lower side of the first port, and at least one second flow path hole communicating with the second port may be formed around the orifice housing.

The annular unit is an annular check valve unit that blocks fluid flow through the annular spacing space when the lifting rod is lowered and performs a check valve function by allowing fluid flow through the annular spacing space when the lifting rod is lifted, The unit includes an annular valve seat provided at an annular spacing space between the first port and the second port and provided with at least one check valve hole penetrating the upper and lower portions along the annular shape, And a check valve spring provided around the replaceable orifice unit at the lower side of the check valve unit for elastically supporting the check valve unit, wherein the inner seal ring is provided in the inside of the annular valve seat And can be provided on the side surface.

At this time, in another example, the annular valve seat may include an outer sealing ring that is hermetic with the body housing on the outer surface, a first annular groove formed around the upper end of the interchangeable orifice unit, Further comprising a lower end step extending from the lower end of the upper end step and the lower end of the inner side to form a second annular groove along with the circumference of the replaceable orifice unit, The check valve portion is formed to protrude in an annular shape so as to be pierced by the replaceable orifice unit and to be supported by the check valve spring. The check valve spring and the check valve spring are integrally formed in the first annular groove. An annular valve body in which the upper portion is raised and lowered by the upper and lower pressure difference and is inserted into the second annular groove, It is formed on the projecting portion and including a sealing sheet to maintain airtightness when the check valve blocks the hole, the other end of the check valve spring can be supported on the bottom of the fastening part.

In another example, the orifice set includes an adjuster housing inserted into the orifice housing above the second flow path hole and having an orifice hole at the upper end thereof, and a tapered head. In accordance with the descent of the lift rod, An orifice adjuster for lowering the downwardly projecting tip portion and the head upper portion against each other and lowering by an elastic force and opening and closing the orifice hole in the adjuster housing, a head of the orifice adjuster around the adjuster rod connected to the head of the orifice adjuster in the adjuster housing An orifice spring disposed at a rear end of the adjuster housing and having an adjuster guide hole penetrating the adjuster rod and supporting the orifice spring, the orifice housing having an opening at the upper end thereof, To expose the orifice holes of the adjuster housing inserted into the adjuster housing.

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 according to one of the first and second embodiments.

According to one embodiment of the present invention, the lift height can be adjusted so that the orifice replacement type electronic expansion valve has an appropriate range of the lift range in accordance with the replacement of the orifice.

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.

1 is a cross-sectional view schematically showing an electronic expansion valve according to one embodiment of the present invention.

2 is a cross-sectional view schematically showing an electronic expansion valve according to another embodiment of the present invention.

3 is a view schematically showing an exploded state of the electronic expansion valve according to FIG.

4A and 4B are cross-sectional views schematically showing an electronic expansion valve according to another embodiment of the present invention.

5 is a schematic view of a rising limit adjuster which is a part of an electronic expansion valve according to an embodiment of the present invention.

6 is a view schematically showing an operation housing or a guide housing which is a part of an electronic expansion valve according to an embodiment of the present invention.

7 is a view schematically showing a disassembled state of an operation assembly and an annular check valve unit which are a part of an electronic expansion valve according to one embodiment of the present invention.

8A and 8B are views schematically showing a replaceable orifice unit, which is a part of an electronic expansion valve according to one embodiment of the present invention.

According to one embodiment of the present invention, there is provided an apparatus comprising: a body housing having a first port formed around the body; An operation housing provided in the main body housing and having a guide hole therein, a rotation drive unit installed in an upper space of the operation housing, and a lift and rotation unit installed in a lower portion of the rotation drive unit, receiving rotation power of the rotation drive unit, An actuating assembly including a rod; And an orifice housing which is provided in the lower portion of the operation assembly in the body housing to be replaceable through the lower end of the body housing and which functions to expose the orifice hole at the upper center and the expansion valve, Wherein the actuating housing is provided with a rising / restricting space at an upper portion of the guide hole, and the actuating assembly is installed in a space for restricting the lifting / lowering of the lift rod, And an elevation limit adjuster for adjusting the elevation limit height.

According to another embodiment of the present invention, an air conditioning system having an electronic expansion valve according to an embodiment of the present invention described above on a pipeline is proposed.

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.

The drawings referred to in this specification are examples for explaining an embodiment of the present invention, and shapes, sizes, thicknesses, and the like may be exaggerated or reduced for effective description of technical features.

[Electronic expansion valve]

An electronic expansion valve according to an embodiment 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.

FIG. 1 is a cross-sectional view schematically showing an electronic expansion valve according to one embodiment of the present invention, FIG. 2 is a cross-sectional view schematically showing an electronic expansion valve according to another embodiment of the present invention, 4A and 4B are cross-sectional views schematically showing an electronic expansion valve according to another embodiment of the present invention, and Fig. 5 is a cross-sectional view schematically showing one embodiment 6 is a schematic view of an operating housing or a guide housing which is a part of an electronic expansion valve according to an embodiment of the present invention , Fig. 7 schematically shows the disassembled state of the operating assembly and the annular check valve unit, which is a part of the electronic expansion valve according to one embodiment of the present invention And Figs. 8A and 8B are views schematically showing the replaceable orifice unit, which is a part of the electronic expansion valve according to one embodiment of the present invention.

In this case, the electronic expansion valve of Fig. 1 is closed, the electronic expansion valve of Figs. 2 and 4a is in an open state, and the electronic expansion valve of Fig. 4b is shut off And a check valve function is performed. The function of the electronic expansion valve according to the present embodiment can be variously implemented by applying the blocking and opening of the valves shown in Figs. 1, 2, 4a and 4b, respectively.

An electronic expansion valve according to one example will be described with reference to Figs. 1 to 4B. The electronic expansion valve according to one example includes a body housing 10, a working assembly 30 and a replaceable orifice unit 50. The main body housing 10 has a first port 10a formed around it. The actuation assembly 30 is installed in the body housing 10. The operation assembly 30 includes an operation housing 31 having a guide hole 131a therein, a rotation drive unit 33 installed in an upper space of the operation housing 31, and a rotation drive unit 33 And a lifting rod 35 that receives the rotational power of the rotary drive unit 33 and penetrates through the guide hole 131a and moves up and down without rotation. The replaceable orifice unit 50 is installed in the lower portion of the operating assembly 30, for example, under the lifting rod 35, in the body housing 10 interchangeably through the lower end of the body housing 10. At this time, the replaceable orifice unit 50 includes an orifice housing 51 for exposing the orifice hole 50a at the upper center, and an orifice housing 51 for opening and closing the orifice housing 51 in accordance with the lifting and lowering of the lifting rod 35, And an orifice set 53 for opening and closing the orifice hole 50a. In the embodiment of the present invention, the actuating housing 31 is formed with a rising / restricting space 31c at an upper portion of the guide hole 131a, and the actuating assembly 30 is installed in the elevating and restricting space 31c, And a rising limit adjuster 37 for adjusting the height of the rising limit of the lift limiter 35. 1 to 4B, the electronic expansion valve according to another example may further include an annular unit 70, 70 '. For example, referring to Figures 2 to 4b, the annular unit 70, 70 'may be an annular check valve unit 70'.

The respective constitutions of the electronic expansion valve will be described in detail. Hereinafter, the main body housing 10, the operating assembly 30 and the replaceable orifice unit 50, which are the basic constitution of the electronic expansion valve according to one example, will be described first, and then the annular units 70 and 70 ' Specifically, we will look at it.

The body housing (10)

The main body housing 10 will be described with reference to Figs. 1 to 4B. The main body housing 10 has a first port 10a formed around it. Referring to FIGS. 1 to 4B, in one example, the main body housing 10 may further include a second port 10b formed around the lower side of the first port 10a. Although not shown, the main body housing 10 is connected to the lower end opening of a later-described replaceable orifice unit 50 without the second port 10b, for example, through the orifice port unit 55 shown in Fig. 4B, Function may be performed. The first port 10a serves as an outlet side port when the expansion valve function is performed in the electronic expansion valve according to one embodiment of the present invention. Referring to FIGS. 2 to 4B, in the electronic expansion valve according to another embodiment, It can serve as inlet port when valve function is performed. In one example, when the second port 10b is provided, the second port 10b may be an inlet port in one embodiment of an expansion valve function, and in another embodiment, And can act as an outlet port. In one example, when the second port 10b is not provided, the opening of the orifice port unit 55 provided at the lower end opening of the replaceable orifice unit 50, for example, the lower end opening, And may serve as an outlet side port of the check valve when the check valve function also serves as the check valve function.

A replaceable orifice unit 50 is installed inside the body housing 10 with the operation assembly 30 installed therein and through the lower end opening of the body housing 10. For example, the replaceable orifice unit 50 may be inserted into the main body housing 10 through a lower end hole 13a formed in the lower end fastening portion 13 at the lower end of the main body housing 10. For example, the mounting position of the operating assembly 30 may be such that the position of the first port 10a is higher than that of the first port 10a, or that the first flow hole 231a formed in the operating assembly 30 corresponds to the position of the first port 10a, for example. Can be installed.

For example, when the second port 10b is provided, the first port 10a and the second port 10b can be formed in different directions or in the same direction, and the installation height is different at this time. Since the replaceable orifice unit 50 is replaceably fastened or engaged at the lower end of the main housing 10, the second flow hole 51b of the replaceable orifice unit 50 corresponds to the position of the second port 10b The position of the second port 10b can be determined. For example, between the positions of the first port 10a and the second port 10b, an annular unit 70 to an annular valve seat 71 described later may be installed.

For example, in one example, the lower end fastening portion 13 may be provided at the lower end of the main body housing 10. The lower end fastening portion 13 may have a lower end hole 13a through which the replaceable orifice unit 50 passes. 2, 3 and 4a, the lower end fastening portion 13 is formed with threads on the inner surface of the coupling member 113 welded to the inner side of the main body housing body 11 to the body 11 And can be screwed to the replaceable orifice unit 50. At this time, a hermetic member 13b for hermetic sealing may be provided at the joint portion.

For example, the main body housing 10 can be coupled to the upper end of the housing body 11 while keeping the housing cap 15 hermetic. Or when the driving unit housing 31b to be described later is engaged with the upper end of the housing body 11 so as to be coupled to the housing body 15, the circumference of the protruding portion of the housing body 11 and the driving unit housing 31b is simultaneously tightened, Can be maintained. For example, replacement of the operating assembly 30 may be possible through the top of the housing body 11 after disengagement of the housing cap 15. For example, a connector 133a for supplying external power to the motor 33a may be provided at an upper center portion of the housing cap 15. 3, the housing cap 15 includes a first cap 15a fastened to a coupling member 115 to be welded or fastened to an upper end of the housing body 11 and a second cap 15a fastened to the upper end of the first cap 15a. And a second cap 15b covering the installed connector 133a. A sealing member 115a for maintaining airtightness between the first cap 15a and the upper joining member 115 of the housing body 11 and a sealing member 115b for maintaining the airtightness between the upper end of the first cap 15a and the connector 133a And a member 115b.

The first port 10a of the main body housing 10 or the first port 10a and the second port 10b may be connected to each other or may be formed with a piping connector 110 for piping connection. For example, referring to FIG. 4B, a connector cap 110a is installed at an opening of a piping connector 110 connected to a second port 10b to block the flow of fluid through the second port 10b, So that the fluid can flow through the opening of the orifice port unit 55 of the orifice unit 50. 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.

In addition, the main body housing 10 may be made of a metal such as copper, iron, or an alloy material. For example, the material of the main housing 10 may be a copper material or a copper alloy material.

The actuating assembly (30)

Next, the operation assembly 30 will be described in detail with reference to Figs. 1 to 4B. The actuating assembly 30 is installed in the body housing 10, for example in the upper space in the body housing 10. [ At this time, the actuating assembly 30 includes an actuating housing 31, a rotary drive 33, and a lifting rod 35. The operation housing 31 has a guide hole 131a therein. The rotation drive portion 33 is installed in the upper space of the operation housing 31. The lifting and lowering rod 35 is installed at a lower portion of the rotation driving part 33 and receives the rotational power of the rotation driving part 33 to pass through the guide hole 131a and to lift and lower it without rotation. In an embodiment of the present invention, the actuating assembly 30 further includes a lift limit adjuster 37 that adjusts the elevation limit height of the lift rod 35.

Hereinafter, the operation and configuration of the lifting rod 35, the configuration of the operating housing 31, the operation and configuration of the rotary drive 33, and the elevation limit adjuster 37 will be described in detail.

The orifice hole 50a of the replaceable orifice unit 50 to be described later is shut off when the lifting rod 35 is lifted and the orifice hole 50a are opened. When the lifting rod 35 is lowered, the electronic expansion valve according to the present invention operates as an expansion valve. For example, in one example, referring to Figs. 2 to 4B, when the lifting rod 35 is in an elevated state, the orifice hole 50a of the replaceable orifice unit 50 is shut off and the first port 10a Is higher than the pressure of the fluid below the annular check valve unit 70 'described below, the annular check valve unit 70' is opened by bypassing the orifice hole 50a, and the electronic expansion valve according to one embodiment is opened And operates as a check valve.

7, in one example, the elevating rod 35 is formed in a non-circular horizontal cross-sectional structure so that the guide hole inserting portion corresponds to the guide hole 131a, so that the rotational force transmitted to the elevating rod 35 Resistance and can be made to be a non-rotating lift. 1 to 4B, the lifting rod 35 is provided at its upper end with a rod locking groove 35a to which a shaft rod 33c is screwed. The shaft rod 33c, which is fastened to the rod locking groove 35a, 33c.

For example, in one example, referring to Figs. 1 to 4B and Fig. 7, the lifting rod 35 may further include a load head 35b, a rod body 35c and a downwardly projecting portion 35d. The load head 35b protrudes in the horizontal direction around the upper end and is disposed in the lift restraint space 31c below the ceiling portion 37b of the lift limit adjuster 37 described later. Referring to FIG. 7, the rod body 35c is connected to the lower portion of the load head 35b and has a non-circular horizontal cross-sectional structure. The downwardly projecting portion 35d protrudes downward from the lower end of the rod body 35c. The downwardly projecting portion 35d of the lifting rod 35 comes into contact with the end of the head 153b of the orifice adjuster 53b passing through the orifice hole 50a of the replaceable orifice unit 50 at the time of descending and the orifice adjuster The orifice hole 50a can be opened by pushing downward the head 153b of the first and second bosses 53a and 53b.

Next, the construction of the operating housing 31 will be described. The operation housing 31 has a guide hole 131a therein. At this time, the lifting rod 35 passes through the guide hole 131a and moves up and down without rotation. The upper end of the lifting rod 35 such as the load head 35b is disposed in the upper space of the guide hole 131a and the body 35c of the lifting rod 35 passes through the guide hole 131a, The lower end of the guide portion 35, for example, the downwardly projecting portion 35d protrudes to the lower portion of the guide hole 131a. In the upper space of the operation housing 31, a rotation drive part 33 is provided.

For example, the guide hole 131a may be formed as a non-circular structure on the horizontal cut surface corresponding to the cross-sectional shape of the body 35c of the lifting rod 35. [ Thus, the guide hole 131a interrupts the rotation of the lifting rod 35 and guides only the lifting and lowering. The lifting and lowering rod 35 can be lifted up and down along the guide hole 131a.

The upper end of the guide hole 131a is in contact with the upper end of the lifting rod 35 when the lifting rod 35 is lowered. 35 are engaged with each other and the maximum falling range is limited. The limit of the maximum falling range of the lifting rod 35 by the guide housing 31a is such that the downwardly projecting portion 35d of the lifting rod 35 moves beyond the opening of the orifice hole 50a, It is possible to prevent the result of cutting off the hole 50a.

Referring to FIG. 1, for example, the operation housing 31 may have a cover 31d at the lower end thereof and a guide hole 131a formed on the cover 31d. 2 to 4B, 6 and 7, the operation housing 31 includes a guide housing 31a and a guide hole 131a formed in the guide housing 31a.

2 to 4B, 6 and 7, the actuating housing 31 includes a guide hole 131a extending downwardly around the first port 10a of the body housing 10, And the first flow path hole 231a. 1, since the operating housing 31 is not extended to the lower side of the guide hole 131a, the fluid can flow through the first port 10a without the first flow hole 231a. 2 to 4B, 6 and 7, a first flow-through hole 231a is provided to allow fluid, which has exited through the orifice hole 50a, to flow through the first flow-through hole 231a in the operating housing 31, (10a). ≪ / RTI > Fluid flow in the opposite direction is also possible.

6, in one example, the operating housing 31 includes an enlarged ascending and anringing space 31c at the upper end of the guide hole 131a and a plurality of through-hole adjusting holes 31c passing through the outside of the operating housing 31. [ (331a). At this time, the elevation limit height can be adjusted by rotating the elevation limit adjuster 37 through the adjusting groove 137a of the elevation limit adjuster 37 exposed through the through-hole adjusting hole 331a.

For example, referring to Figs. 2 to 4B, in one example, the actuating housing 31 may be provided with a guide housing 31a and a drive housing 31b. At this time, a guide hole 131a is formed in the guide housing 31a. The guide housing 31a has at least one first flow hole 231a. That is, at least one first flow path hole 231a communicating with the first port 10a is formed around the lower side of the guide hole 131a. At this time, the lifting rod 35 is inserted into the guide housing 31a through the guide hole 131a. For example, the lower end of the guide housing 31a may be fastened to the upper end of the annular unit 70, 70 ', e.g., the annular fastening valve unit 70'.

For example, referring to FIG. 6, in one example, the guide housing 31a may include a plurality of through-hole adjusting holes 331a penetrating through the elevated and fixed space 31c and the outside of the operating housing 31. [ The through-hole adjusting hole 331a is formed on the lower portion of the annular region and the outer periphery of the upper end portion of the guide housing 31a in the horizontal direction to have a '' 'shape on one side of the cross section as shown in FIG. 6, ) Is fastened to the inner surface of the enlarged portion of the upper end, the adjusting groove 137a of the upper limit adjuster 37 can be exposed through the lower portion of the upper enlarged portion. 6, the guide housing 31a includes a guide hole 131a, a lower end portion constituting the guide hole 131a, a lower end portion constituting the guide hole 131a, and an upper end portion constituting the upper circumference of the guide hole 131a. . At this time, the horizontal side of the through-hole adjusting hole 331a is formed by the upper end of the lower end of the guide housing 31a at the inner side in the guide hole direction and passes through the lower portion of the annular region enlarged in the horizontal direction of the upper end of the guide housing 31a Further, the vertical side of the through-hole adjusting hole 331a may be formed at a predetermined height, which is perpendicular to the circumferential direction, around the upper end of the guide housing 31a, and the inner upper surface may be formed on one side of the guide groove 31a.

For example, the number of the through-hole adjusting holes 331a may be equal to or less than the number of the adjusting grooves 137a. For example, when the circumferential direction is taken as a reference, the width of each through-hole adjusting hole 331a may be wider than that of each of the adjusting grooves 137a, and the through-hole adjusting hole 331a may be formed smaller than the number of the adjusting grooves 137a. Since the width of each through-hole adjusting hole 331a is wide with respect to the circumferential direction, the tool can be inserted into the adjusting groove 137a through the exposed space to easily rotate the elevation limit adjuster 37 and adjust the height.

The drive housing 31b is fastened to the upper end of the guide housing 31a and houses a rotation drive part 33 therein. The upper end of the guide housing 31a is enlarged at the upper end of the guide hole 131a and can form the lower part of the up / down restraint space 31c described later. For example, the drive housing 31b may protrude from the lower inner circumferential surface to limit the elevation height of the elevation limit adjuster 37 and form the elevation restraint space 31c together with the upper end of the guide housing 31a.

Next, the rotation drive unit 33 will be described. In one example, referring to Figs. 1 to 4B, the rotation drive unit 33 may include a motor 33a and a shaft rod 33c. The shaft rod 33c rotates in accordance with the rotation of the motor 33a and lifts the lift rod 35. The shaft rod 33c is screwed around the elevating rod 35 and receives the rotational force of the motor 33a to move the elevating rod 35 up and down.

For example, the shaft rod 33c passes through a rod through hole 37c formed in the upper center of the elevation limit adjuster 37 and is screwed to the rod engaging groove 35a of the lifting rod 35 to be fastened .

For example, the lifting and lowering of the lifting rod 35 can be performed according to the forward / reverse rotation of the motor 33a. For example, when the motor 33a rotates in the forward direction, the lifting rod 35 is lowered, and when the motor 33a rotates in the reverse direction, the lifting rod 35 can be raised or vice versa. For example, the motor 33a may be a stepping motor. The lifting rod 35 is engaged with the shaft rod 33c so that the rotational motion of the shaft rod 33c due to the rotation of the motor 33a can be switched to the vertical movement of the lifting rod 35. [

In one example, the rotation driving unit 33 may further include a speed reducer 33b connected to the motor 33a and decelerating the rotation of the motor 33a to transmit the reduced rotation to the shaft rod 33c.

Next, the rise limit adjuster 37 will be described in detail. In an embodiment of the present invention, the actuating assembly 30 further includes a lift limit adjuster 37 that adjusts the elevation limit height of the lift rod 35. The operating housing 31 forms a rising and restraining space 31c at the upper portion of the guide hole 131a and the rising limit adjuster 37 is provided in the ascending and anringing space 31c.

The electronic expansion valve according to the present invention includes the replaceable orifice unit 50. The through height or the protrusion height of the orifice adjuster 53b passing through the orifice hole 50a in the orifice unit is the same as that of the replaceable orifice unit 50, And the like. The electronic expansion valve including the replaceable orifice unit 50 must be able to change various orifice units smoothly, so that the limit of the height of the lift of the lifting rod 35 is preferably set to the maximum. At this time, when the through hole or protrusion height of the orifice adjuster 53b is changed to a lower interchangeable orifice unit 50, the up / down rod 35 keeps rising following the rotation of the motor even after the orifice hole 50a is shut off . The lower end of the lifting rod 35 can not directly push the upper end of the orifice adjuster 53b blocking the orifice hole 50a in accordance with the rotation of the motor even when the lifting rod 35 is loaded, 53b. If this process is repeated, the precision of control of the electronic expansion valve may be deteriorated.

To solve this problem, the actuating assembly 30 may be provided with a lift limit adjuster 37 as in the embodiment of the present invention. Accordingly, an appropriate ascending section can be set according to the replaceable orifice unit 50 to be replaced. Further, according to continuous use of the electronic expansion valve, the remaining motor rotation is repeated after reaching the limit of the lifting section, so that the control of the lifting section can be loosened. The loosening of the limit range of the lifting section finely depending on the repeated use may occur not only when the operation control is performed with resistance against rotation but also when the operation control is performed with the lifting distance. In this case, in the embodiment of the present invention, the control accuracy of the electronic expansion valve can be improved through adjustment of the lift height even if the lift limit range is loosened by adjusting the lift height through the lift limit adjuster 37.

For example, referring to FIGS. 1 to 4B and 5, the elevation limit adjuster 37 may include a height adjusting portion 37a, a ceiling portion 37b, and a rod through hole 37c. The height adjusting portion 37a is formed along the edge and is screwed to the inner circumferential surface of the elevated and constrained space 31c expanded at the upper end of the guide hole 131a. For example, referring to FIG. 5, in one example, the height adjusting portion 37a may include a plurality of adjusting grooves 137a formed from the lower side to the upper side along the edge. At this time, the adjusting grooves 137a may be exposed through the plurality of through-hole adjusting holes 331a formed in the operating housing 31, for example, the guide housing 31a. The elevation limit height can be adjusted by rotating the elevation limit adjuster 37 through the adjustment groove 137a exposed through the through-hole adjusting hole 331a. For example, the number of the through-hole adjusting holes 331a formed in the guide housing 31a may be equal to or less than the number of the adjusting grooves 137a formed in the height adjusting portion 37a, and may be reduced, for example. The number of the through-hole adjusting holes 331a is small, and the width of the through-hole adjusting holes 331a is wider than the angle adjusting grooves 137a with respect to the circumferential direction. For example, six adjusting grooves 137a are formed along the circumferential direction, and the through-hole adjusting holes 331a are formed in four, and the circumferential widths are formed to be wider, but are not limited thereto. For example, the adjusting grooves 137a may be formed at regular intervals along the circumferential direction of the height adjusting portion 37a.

The ceiling portion 37b defines a rising limit of the lifting rod 35. [ The ceiling portion 37b is spaced apart from the upper enlarged portion of the guide hole 131a of the operating housing 31, for example, the guide housing 31a to limit the height of the rising height. The rod through hole 37c is formed at the center of the ceiling portion 37b and penetrated by the shaft rod 33c.

The exchangeable orifice unit 50

Next, a replaceable orifice unit 50 will be described with reference to Figs. 1 to 4B, 8A and 8B. The replaceable orifice unit 50 is installed in the lower portion of the operating assembly 30, for example, under the lifting rod 35, in the body housing 10 interchangeably through the lower end of the body housing 10. At this time, the replaceable orifice unit 50 includes an orifice housing 51 and an orifice set 53. The orifice housing (51) exposes the orifice hole (50a) at the upper center. An orifice set (53) is provided in the orifice housing (51). The orifice set 53 opens and closes the orifice hole 50a in the orifice housing 51 in accordance with the descent and elevation of the lifting rod 35 so that the expansion valve function is performed.

The replaceable orifice unit 50 shown in Figs. 1 to 4b, 8a and 8b can be combined with the constructions of the other drawings according to the embodiment to constitute the electronic expansion valve according to one example of the present invention.

The orifice housing 51 and the orifice set 53, and further the orifice port unit 55 will be described.

For example, the orifice housing 51 may have an orifice hole 50a directly at the upper center portion or may surround the adjuster housing 53a with the orifice hole 50a to expose the orifice hole 50a. For example, as shown in Figures 1 and 8a, an orifice hole 50a may be formed directly in the center of the orifice housing 51, or may be exposed to the outside of the orifice housing 51, as shown in Figures 2-4b and 8b. The orifice hole 50a can be exposed through the opening 51a formed in the upper center. 2 to 4B and 8B, the upper opening 51a of the orifice housing 51 exposes the orifice hole 50a of the adjuster housing 53a inserted inside the orifice housing 51. In Fig.

Referring to Figures 1 to 4b, 8a and 8b, in one example, the orifice housing 51 is provided with at least one second flow hole 51b around the second port 10b of the body housing 10 . For example, when the main body housing 10 does not have the second port 10b, the fluid flows through the lower end opening of the replaceable orifice unit 50, so that the second flow path hole 51b may not be provided. For example, referring to FIGS. 1 to 4A, since the lower end opening of the replaceable orifice unit 50 is blocked, the second port 10b and the fluid can flow through the second flow hole 51b provided in the orifice housing 51 Can be exchanged. For example, the position of the second flow hole 51b may be arranged in a substantially same height range as the second port 10b of the main body housing 10, but is not limited thereto.

Next, the orifice set 53 will be described. Referring to Figures 2 to 4B, in one example, the orifice set 53 may include an adjuster housing 53a, an orifice adjuster 53b, an orifice spring 53c, and a spring support 53d. The adjuster housing 53a is inserted into the orifice housing 51 on the upper side of the second flow hole 51b and an orifice hole 50a is formed on the upper side. For example, the orifice hole 50a of the adjuster housing 53a may be exposed through the top opening 51a formed in the orifice housing 51. [ For reference, an orifice hole 50a is formed on the orifice housing 51 without the adjuster housing 53a in FIG.

Referring to FIGS. 1 to 4B, the orifice adjuster 53b has a tapered head 153b. When the lifting rod 35 is lowered, the downward-pointed end portion 35d and the upper end of the head abut against each other, Lt; / RTI > The orifice hole 50a is opened and closed as the orifice adjuster 53b descends and rises. In Fig. 1, an orifice adjuster 53b is provided in the orifice housing 51, and in Figs. 2 to 4b an orifice adjuster 53b is provided in the adjuster housing 53a. The opening of the orifice hole 50a by the orifice adjuster 53b is stopped by the elastic force of the orifice spring 53c in accordance with the rise of the lifting rod 35 due to the reverse rotation or forward rotation of the motor 33a, (53b) can be raised and blocked. For example, the orifice adjuster 53b may include an adjuster rod 253b and a head 153b. The head 153b includes a conical columnar shape on the upper side of the adjuster rod 253b so that the upper end of the head 153b 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 head 153b may be provided with a receiving groove on which the downwardly projecting portion 35d of the lifting rod 35 is seated.

Referring to Figures 1 to 4b, the orifice spring 53c is configured to pivot the lower portion of the head 153b of the orifice adjuster 53b around the adjuster rod 253b connected to the head 153b of the orifice adjuster 53b, do. At this time, the orifice spring 53c is installed in the orifice housing 51 in Fig. 1 and in the adjuster housing 53a in Figs. 2 to 4b.

Referring to Figs. 2 to 4B, the spring support portion 53d is provided at the rear end of the adjuster housing 53a and supports the orifice spring 53c. In Fig. 1, the orifice spring 54 carries out the role of supporting the orifice spring 53c. 2 to 4B, the spring support 53d may have an adjuster guide hole 153d through which the adjuster rod 253b penetrates. In Figs. 2 to 4B, the spring support 53d is formed so that fluid can pass therethrough.

Next, the configurations added to the replaceable orifice unit 50 according to the embodiment will be described. For example, at the lower end of the orifice housing 51, an orifice cap 54 may be provided as shown in FIGS. The orifice cap (54) closes the bottom opening of the orifice housing (51). The orifice housing 51 is fastened on the orifice cap 54 and the orifice cap 54 is mounted on the lower end hole 13a of the lower end fastening portion 13 of the main housing 10, Can be screwed together. At this time, the orifice cap 54 can be rotated to fasten the replaceable orifice unit 50 to the lower end hole 13a or to separate the lower end hole 13a from the lower end hole 13a. For example, when the orifice cap 54 is fastened to the lower end hole 13a of the lower end fastening portion 13, a sealing member may be provided between the lower end fastening portion 13 and the air tightness. For example, as shown in FIGS. 2 to 3, the orifice cap 54 is formed with a tool insertion groove at the lower end thereof, such as a hexagon wrench or the like, which is inserted into the tool insertion groove or formed with a bolt head at the lower end as shown in FIG. The coupling or release with the lower end fastening portion 13 can be performed while turning the head.

Referring to Figs. 4A and 4B, the replaceable orifice unit 50 may further include an orifice port unit 55. Fig. The orifice port unit 55 has a port flow path 55a formed therein. The port flow path 55a of the orifice port unit 55 can form one flow path of the electronic expansion valve according to one embodiment of the present invention. For example, as shown in FIG. 4B, when the second port 10b is shut off, the fluid can flow through the port flow path 55a of the orifice port unit 55. The orifice port unit 55 is installed at the lower end of the orifice housing 51. For example, at least a part of the periphery of the orifice housing unit 51 and the periphery of the orifice port unit 55 may be fastened to the lower end hole 13a of the lower end fastening portion 13 of the main body housing 10.

Referring to FIG. 4A, a port cap 55c for blocking the port flow path 55a of the orifice port unit 55 may be provided. Referring to FIG. 4B, when the photo-channel 55a is opened, the connector cap 110a may be provided on the second port 10b side.

For example, referring to FIGS. 4A and 4B, in one example, the orifice port unit 55 may further include an orifice connector 155 that is fastened to the lower side of the orifice port unit 55. In FIG. 4A, the orifice connector 155 may be provided to fix the port cap 55c, and in FIG. 4B, the orifice connector 155 may be provided to connect the other pipe to the photoflow path 55a. 4A and 4B, the orifice connector 155 is fastened to the lower side of the orifice port unit 55 and is screwed into the lower end fastening portion 13 of the body housing 10 and is connected to the replaceable orifice unit 50 And can be fixed to the lower end of the main body housing 10.

Referring to Figures 2 to 4B, in one example, the orifice port unit 55 may further include a fluid permeable net 55b. The fluid permeable net 55b is provided on the upper side of the orifice port unit 55. The fluid permeable net 55b allows fluid flowing from the photo-channel 55a or fluid exiting to the photo-flow channel 55a.

The annular units 70, 70 'to the annular check valve unit 70'

Next, the annular units 70, 70 'to the annular check valve unit 70' will be described with reference to Figs. 1 to 4B. In one example, the electronic expansion valve may further include an annular unit 70, 70 '. The annular units 70 and 70 'are installed in annular spaced spaces between the upper periphery of the replaceable orifice unit 50 and the inside of the main housing 10. The annular unit 70, 70 'has an inner sealing ring 72a on the inner side facing the upper circumference of the replaceable orifice unit 50 and is capable of maintaining the airtightness of the annular spacing space when opening the orifice hole 50a have.

In Fig. 1, the annular unit 70 is merely to maintain the airtightness of the annular spacing space and can not perform the same check valve function as the annular check valve unit 70 'shown in Figs. 2 to 4B. Although not shown, the annular unit 70 shown in Fig. 1 is provided in place of the annular check valve unit 70 'in the electronic expansion valve shown in Figs. 2 to 4B, so that the electronic expansion valve functions as a simple expansion valve function . ≪ / RTI >

Referring to Figs. 2 to 4B, the annular unit 70, 70 'may be an annular check valve unit 70'. At this time, the annular check valve unit 70 'interrupts the fluid flow through the annular spacing space when the lifting rod 35 is lowered, permits fluid flow through the annular spacing space when the lifting rod 35 is lifted, Can be performed. The check valve function is performed when the orifice hole 50a is closed by the lifting rod 35 rising.

For example, referring to FIGS. 2-4b, in one example, the annular check valve unit 70 'may include an annular valve seat 71, a check valve portion 75, and a check valve spring 73. Referring to Figs. 2 to 4B and 7, the annular valve seat 71 is installed in an annular spacing space between the first port 10a and the second port 10b. At least one check valve hole (71a) passing through the upper and lower portions along the annular shape of the annular valve seat (71) is formed. For example, the check valve hole 71a may be an annular arc-shaped structure formed along the annular shape, but is not limited thereto. At this time, the inner sealing ring 72a may be provided on the inner surface of the annular valve seat 71.

Referring to Figs. 2 to 4B, in one example, the annular valve seat 71 may further include an outer sealing ring 72b and an upper end step portion 71b. Further, in one example, the annular valve seat 71 may further include a lower end step portion 71c. The outer sealing ring 72b is hermetically sealed to the body housing 10 on the outer surface of the annular valve seat 71. The upper step portion 71b is enlarged at the upper end portion of the inner side surface of the annular valve seat 71 to form a first annular groove 171b together with the upper end portion of the replaceable orifice unit 50. [ For example, at this time, the lower end of the operating housing 31, for example, the lower end of the guide housing 31a, may be inserted into the first annular groove 171b. At this time, at least one first flow path hole 231a communicating with the first port 10a is formed around the operation housing 31 to the guide housing 31a.

The lower stepped portion 71c is bent at the lower end of the inner surface of the annular valve seat 71 and extended to form the second annular groove 171c together with the periphery of the replaceable orifice unit 50. [ For example, at this time, the upper end of the check valve portion 75 can be inserted into the second annular groove 171c when the check valve spring 73 is lifted.

Next, the check valve unit 75 will be described. 2 to 4B, the check valve unit 75 is installed at the lower end of the check valve hole 71a and performs shutoff and opening of the check valve hole 71a in accordance with the difference in pressure between the upper and lower sides. The upper and lower pressure difference is a pressure difference in which the pressure due to the elastic force of the check valve spring 73 is considered together.

For example, referring to Figs. 2 to 4B, in one example, the check valve portion 75 may include an annular valve body 75a and a sealing sheet 75b. The annular valve body 75a is formed so as to protrude in the annular shape around the periphery thereof so as to be penetrated by the replaceable orifice unit 50 and supported by the check valve spring 73. The annular valve body 75a ascends and descends by the check valve spring 73 and the upper and lower pressure differentials. For example, the upper end portion of the annular valve body 75a can be inserted into the second annular groove 171c when lifted. The sealing sheet 75b is formed on the annular protruding portion of the annular valve body 75a to maintain airtightness when the check valve hole 71a is closed.

2 to 4B, the check valve spring 73 is installed around the replaceable orifice unit 50 at the lower side of the check valve unit 75 and elastically supports the check valve unit 75. For example, the other end of the check valve spring 73 may be supported on the lower end fastening portion 13.

[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 according to any one of the embodiments of the above-described invention. The specific description of the electronic expansion valve is replaced by the foregoing description. The electronic expansion valve according to the embodiments of the present invention can perform the check valve function as well as the main function of the electronic expansion valve according to the control. Therefore, it is possible to simplify the piping configuration in the cooling and heating system, Can be saved. 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 the conventional parallel pipe structure to one channel and to provide the electronic expansion valve according to the present invention on the pipe. Therefore, a detailed description of the piping structure capable of reducing the two pipelines to one piping so as to include the electronic expansion valve 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.

The present invention relates to an electronic expansion valve and an air conditioning and heating system, and is industrially applicable to the field of air conditioning technology.

Claims (10)

1. A body housing having a first port formed around the body; A rotation driving unit installed in the upper space of the operation housing, and a rotation driving unit installed in the lower part of the rotation driving unit, passing through the guide hole, receiving rotation power of the rotation driving unit, An actuating assembly including a lifting rod for non-rotating lift; And an orifice housing which is provided at a lower portion of the operating assembly in the main housing to be replaceable through the lower end of the main housing and which exposes an orifice hole at an upper center thereof, And a replaceable orifice unit including an orifice set for opening and closing the orifice hole in the orifice housing, the electronic expansion valve comprising:

   The operation housing has an elevation restraint space formed on the upper portion of the guide hole,

   Wherein the actuating assembly further comprises an elevation limit adjuster installed in the elevation restraint space for adjusting the elevation limit height of the elevation rod.
2. In claim 1,

   Wherein the rotation drive unit includes a motor and a shaft rod that rotates in accordance with rotation of the motor and has a thread formed around the shaft,

   The hoistway has a non-circular horizontal cross-sectional structure with a guide hole inserting portion corresponding to the guide hole, and a rod engaging groove to which the shaft rod is screwed at an upper end thereof. The shaft engaging groove is engaged with the rotation of the shaft rod, And then,

   The elevation limit adjuster includes a height adjusting portion formed along the edge and screwed to the inner circumferential surface of the elevated and constrained space enlarged at the upper end of the guide hole, a ceiling portion defining a rising limit of the elevating rod, And a rod through hole through which the rod penetrates.
3. In claim 2,

   The height adjusting portion has a plurality of adjusting grooves formed from the bottom to the top along the edge,

   Wherein the operation housing further includes a plurality of through-hole adjusting holes penetrating the elevated and fixed space expanded from the upper end of the guide hole and the outside of the operating housing,

   And the elevation limit height is adjusted by rotating the elevation limit adjuster through the adjustment groove exposed through the through-hole.
4. In claim 3,

   Wherein the operation housing includes a guide housing having a guide hole formed therein and having at least one first flow hole communicating with the first port around a lower side of the guide hole, And a driving unit housing coupled to an upper end of the guide housing,

   Wherein the drive housing has protrusions protruding from a lower inner circumferential surface to limit the elevation height of the elevation limit adjuster and form the elevation restraint space together with the upper end of the guide housing.
5. In claim 3,

   The rotation driving unit may further include a speed reducer connected to the motor and configured to decelerate rotation of the motor to transmit reduced rotation to the shaft rod,

   The load lifting rod having a rod body protruding horizontally around an upper end thereof and disposed in the upward / downward restraint space of the lower portion of the ceiling portion of the upper limit adjuster, a rod body connected to a lower portion of the load head, Further comprising a downwardly projecting portion protruding downward from a lower end of the rod body.
6. The method according to any one of claims 1 to 5,

   And an inner sealing ring provided on an inner side surface of the replaceable orifice unit facing an upper side of the replaceable orifice unit and provided in an annular spacing space between an upper side of the replaceable orifice unit and the inside of the main body housing, Further comprising an annular unit that maintains the airtightness of the space,

   Wherein a lower end fastening portion is provided at a lower end of the main body housing, and the lower end fastening portion has a lower end hole through which the replaceable orifice unit is supported.
7. In claim 6,

   Wherein the main housing further comprises a second port formed around a lower side of the first port, at least one second flow hole communicating with the second port is formed around the orifice housing,

   Wherein the annular unit is an annular check valve unit that blocks fluid flow through the annular spacing space when the lifting rod is lowered and permits fluid flow through the annular spacing space when the lifting rod is lifted,

   The annular check valve unit includes 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 the upper and lower portions along an annular shape, And a check valve spring installed around the check valve unit and surrounding the check valve unit to elastically support the check valve unit, Including,

   And the inner sealing ring is provided on the inner surface of the annular valve seat.
8. In claim 7,

   The annular valve seat includes an outer sealing ring that is hermetically sealed to the body housing on an outer surface, an upper step portion that is expanded at an upper end of the inner surface to form a first annular groove with the upper end of the replaceable orifice unit, Further comprising a lower step portion extending stepwise from the lower side of the inner side surface to form a second annular groove together with the circumference of the replaceable orifice unit,

   Wherein a lower end of the operating housing is inserted into the first annular groove and at least one first flow hole communicating with the first port is formed around the lower side of the guide hole,

   The check valve unit is formed to protrude in an annular shape around the check valve unit, the check valve unit being pierced by the replaceable orifice unit and supported by the check valve spring. The check valve unit is configured to ascend and descend by the check valve spring and the upper and lower pressure differentials, An annular valve body inserted into the annular groove and a sealing sheet formed on the annular protruding portion of the annular valve body to maintain airtightness when the check valve hole is closed,

   And the other end of the check valve spring is supported on the lower end fastening portion.
9. In claim 6,

   Wherein the main housing further comprises a second port formed around a lower side of the first port, at least one second flow hole communicating with the second port is formed around the orifice housing,

   The orifice set includes an adjuster housing inserted into the orifice housing above the second flow path hole and having an orifice hole formed at an upper end thereof and a tapered head. When the lift rod is lowered, An orifice adjuster for lowering the downwardly projecting tip portion and the head upper portion against each other and descending and rising by elastic force and opening and closing the orifice hole in the adjuster housing and around the adjuster rod connected to the head of the orifice adjuster in the adjuster housing; An orifice spring for elastically supporting a lower portion of the head of the orifice adjuster and a spring support portion provided at a rear end of the adjuster housing and having an adjuster guide hole through which the adjuster rod penetrates and supporting the orifice spring,

   Wherein the orifice housing is formed with an opening at its upper end to expose the orifice hole of the adjuster housing inserted therein.
10. In an air conditioning system having an electronic expansion valve on a piping,

    Wherein the electronic expansion valve is an electronic expansion valve according to any one of claims 1 to 5.

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