WO2011129529A1

WO2011129529A1 - Expansion valve for a vehicle air-conditioning unit

Info

Publication number: WO2011129529A1
Application number: PCT/KR2011/001751
Authority: WO
Inventors: 이건호; 이용주; 박희천
Original assignee: 학교법인 두원학원; 주식회사 두원전자
Priority date: 2010-04-15
Filing date: 2011-03-14
Publication date: 2011-10-20
Also published as: KR101077691B1; KR20110115417A

Abstract

The present invention provides an expansion valve for a vehicle air-conditioning unit, which throttles a refrigerant introduced from a condenser in order to supply the throttled refrigerant to an evaporator, and which controls an aperture by means of a refrigerant introduced from the evaporator and discharged into a compressor. The expansion valve for a car air-conditioning unit comprises: a valve main body which includes first to fourth ports, a throttle channel throttling a refrigerant introduced through the first port and discharged into the second port, a first internal channel in communication with the throttle channel and with the first port to allow a refrigerant introduced through the first port to be discharged into the throttle channel, a second internal channel in communication with the third and the fourth ports to allow a refrigerant introduced through the third port to be discharged into the fourth port, and a through hole formed vertically to pass through the first and second internal channels; a valve part which includes a needle inserted into the through hole to be movable in a vertical direction and a sleeve coupled to one end of the needle to adjust an aperture of the throttle channel according to the movement of the needle; a driving part coupled to the valve main body to vertically move the needle by a refrigerant introduced through the third port; and an elastic member to which the needle is inserted and coupled to allow the needle to be inclined vertically. Accordingly, unstable vibrations of the needle are prevented, thus enabling the expansion valve to stably operate.

Description

Expansion valve for vehicle air conditioner

The present invention relates to an expansion valve for an air conditioner of a vehicle, and more particularly, to an expansion valve for an air conditioner of a vehicle that can prevent hunting of a needle.

In general, an automobile is provided with an air conditioner for providing a comfortable ride to the occupants by maintaining the indoor temperature at an appropriate state by heating or cooling the inside and outside air to enter or circulate into the interior of the vehicle. Such a vehicle air conditioner includes a cooling device for cooling the interior of a vehicle, and a heating device for heating the interior of the vehicle. The cooling device is configured to cool the interior of a vehicle by heat exchange between the evaporator and the indoor and outdoor periods while the heat exchange medium discharged by the driving of the compressor is circulated back to the compressor through the condenser, the receiver dryer, the expansion valve, and the evaporator. In contrast, the heating device is configured to heat the interior of the vehicle by introducing coolant into the heater core and exchanging heat with the outdoor air.

Recently, the L-type expansion valve is widely used as the expansion valve. Referring to FIG. 1, the L-type expansion valve 1 includes a valve body 10, a first bracket 15, and a second bracket 16. The valve body 10 has a rectangular columnar shape. The first bracket 15 serves to mount the condenser outlet pipe 11 and the compressor inlet pipe 14 to the valve body 10, and the second bracket 16 has an evaporator inlet pipe 12 and It serves to mount the evaporator outlet pipe 13 to the valve body (10).

Here, although not shown, the expansion valve (1) is connected to the condenser flow path and the condenser flow path for throttling the refrigerant flowing from the condenser outlet pipe (11) inside the valve body (10), the condenser outlet Internal flow paths communicating with the pipe 11 are formed, respectively. The expansion valve 1 includes a driving part deformed by the refrigerant and a valve part connected to the driving part and installed on the internal flow path to control an opening degree of the throttling flow path, wherein the valve part flows through the throttling flow path. And a needle coupled to the sleeve and moved by the drive unit.

However, the conventional expansion valve 10 has a problem in that a hunting phenomenon occurs in which the needle unstablely vibrates due to a phenomenon in which the driving part reacts sensitively to the coolant temperature change or irregular heat transfer from the coolant to the driving part. there was.

An object of the present invention is to provide an expansion valve for an air conditioner for a vehicle that can prevent needle hunting.

The present invention provides an expansion valve for an air conditioner for a vehicle in which a refrigerant flowing from a condenser is throttled and supplied to an evaporator, and the opening degree is controlled by the refrigerant flowing from the evaporator and flowing out to the compressor, wherein the refrigerant flows from the condenser. And a first port formed on the bottom surface, a second port formed on the first side surface, and a refrigerant flowing from the first port is throttled and supplied to the evaporator, and spaced apart from an upper portion of the second port on the first side surface. And a third port through which the refrigerant flows from the evaporator, and a fourth port formed on the second side surface adjacent to the first side and with which the refrigerant introduced into the third port flows out to the compressor. An throttling flow path through which the refrigerant flowing into the first port and flowing out of the second port is throttled, and the throttle flow path and the first port communicate with each other to flow into the first port. A first internal flow passage through which the introduced refrigerant flows into the throttle flow passage, and a second internal flow passage communicating with the third port and the fourth port and flowing the refrigerant introduced into the third port into the fourth port; A valve body having a through hole formed in an up and down direction to penetrate the first inner flow path and the second inner flow path, a needle inserted into the through hole and movable along the up and down direction, and one end of the needle; A valve unit having a sleeve coupled to the valve to adjust an opening degree of the throttle flow passage according to the movement of the needle, coupled to the valve body, and moving the needle in the vertical direction by the refrigerant introduced into the third port. An expansion valve for an air conditioner of a vehicle including a driving member and the needle inserted into and coupled to each other and an elastic member configured to incline the needle in the vertical direction. The.

According to another aspect of the present invention, the present invention relates to an expansion valve for an air conditioner of a vehicle in which an opening degree is controlled by a refrigerant flowing from a condenser and supplied to an evaporator, and the opening degree is controlled by the refrigerant flowing from the evaporator and exiting the compressor. A first port formed on a lower surface of the refrigerant from the condenser, a second port formed on a first side of the refrigerant, and a second port supplied from the first port to the condenser and supplied to the evaporator; A third port formed at an upper portion of the second port and spaced from the evaporator, and a second port formed at a second side surface adjacent to the first side surface and having a refrigerant flowing into the third port flowing out of the compressor; It has a four port, there is an throttle flow passage in which the refrigerant flowing into the first port and outflow to the second port is throttled, the throttle flow path and the first port A first internal flow path communicating with the first port and flowing out the refrigerant flowing into the throttle flow path, and the refrigerant flowing into the third port through communication with the third port and the fourth port; A valve body having a second inner flow passage flowing out to the port, the through-hole formed in the vertical direction so as to pass through the first inner flow passage and the second inner flow passage, the valve body is eccentrically inserted into the through hole, a portion of the outer peripheral side A valve unit having a needle which contacts an inner side surface of the through hole and is movable in the vertical direction, and a sleeve which is coupled to one end of the needle and adjusts the opening degree of the throttle passage according to the movement of the needle; It is coupled to the main body, and includes a drive unit for moving the needle in the vertical direction by the refrigerant introduced into the third port.

According to still another aspect of the present invention, the present invention provides an expansion valve for an air conditioner for a vehicle in which an opening degree is controlled by a refrigerant flowing from a condenser and supplied to an evaporator, and the refrigerant flowing from the evaporator and exiting the compressor. A first port through which the refrigerant flows from the condenser, a second port formed on the first side surface, and the refrigerant introduced from the first port is throttled and supplied to the evaporator, and the second port on the first side surface. A third port formed at an upper portion of the third port through which the refrigerant flows from the evaporator, and a fourth port formed at the second side surface adjacent to the first side and in which the refrigerant introduced into the third port flows out to the compressor; And an throttle flow path through which the refrigerant flowing into the first port and flowing out of the second port is throttled, and communicating with the throttle flow path and the first port. A first internal flow passage which flows the refrigerant introduced into the first port into the throttle flow passage, and the refrigerant flowed into the third port by communicating with the third port and the fourth port and flows out into the fourth port; A valve body having a second inner flow path formed therein and a through-hole formed in a vertical direction to penetrate the first inner flow path and the second inner flow path, and a needle inserted into the through hole and movable in the vertical direction; And a valve unit coupled to one end of the needle and having a sleeve configured to adjust an opening degree of the throttle passage according to the movement of the needle, coupled to the valve body, and the needle by a refrigerant introduced into the third port. A driving part which moves in the vertical direction and is disposed in the through hole so that the needle is inserted and is lowered to a step formed in the through hole so as not to be separated into the first internal flow path. And a sealing member for maintaining the airtightness between the first inner channel and the second inner channel and the driving unit, wherein the needle is inserted into the elastic member to support the needle. to provide.

According to another aspect of the present invention, the present invention provides an expansion valve for an air conditioner of a vehicle in which an opening degree is controlled by a refrigerant flowing from a condenser and supplied to an evaporator, the refrigerant flowing from the evaporator and flowing out to a compressor. A first port through which the refrigerant flows from the condenser, a second port formed on the first side, and the refrigerant flowing from the first port is throttled and supplied to the evaporator, and the second side on the first side. A third port formed at an upper portion of the port and spaced apart from the evaporator, and a fourth port formed at a second side surface adjacent to the first side surface and the refrigerant flowing into the third port flowing out of the compressor; And an throttling flow path through which the refrigerant flowing into the first port and flowing out of the second port is throttled, and communicating with the throttle flow path and the first port. A first internal flow passage which flows the refrigerant introduced into the first port into the throttle flow passage, and the refrigerant introduced into the third port by communicating with the third port and the fourth port and flows out into the fourth port; A valve body having a second inner flow path formed therein and a through-hole formed in a vertical direction to penetrate the first inner flow path and the second inner flow path, and a needle inserted into the through hole and movable in the vertical direction; And a valve unit coupled to one end of the needle and having a sleeve configured to adjust an opening degree of the throttle passage according to the movement of the needle, coupled to the valve body, and the needle by a refrigerant introduced into the third port. A driving unit moving in the up and down direction, disposed in the through hole, and inserted into the needle, and below the stepped portion formed in the through hole so as not to be separated into the first internal flow path. It is supported, and the sealing member for maintaining the airtight between the first inner flow path and the second inner flow path and the needle is inserted into the through-hole in the state penetrated to prevent the sealing member from being separated into the second inner flow path, One end is formed to be exposed on the second internal flow path so that the exposed one end wraps a portion of the needle to adjust the contact area of the refrigerant and the needle, thereby controlling the heat transfer rate from the refrigerant to the needle. An expansion valve for an air conditioner for a vehicle including a bush is provided.

The expansion valve for an air conditioner of the vehicle of the present invention can prevent hunting of the needle.

1 is a schematic perspective view of an expansion valve for an air conditioner of a vehicle having an L-type structure.

2 is a schematic configuration diagram of an air conditioner of a vehicle according to the present invention.

Figure 3 is a schematic exploded perspective view of an expansion valve for an air conditioner of a vehicle according to an embodiment of the present invention.

4 is an assembled perspective view of the expansion valve of FIG. 3.

FIG. 5 is a cross-sectional view schematically illustrating an internal structure of the expansion valve according to line VV of FIG. 3.

6 is an enlarged view of a portion A of FIG. 5.

7 is a plan view illustrating the stopper of FIG. 5.

8 is a perspective view illustrating the stopper and the elastic member of FIG. 5.

9 is a cross-sectional plan view of the elastic member and the needle along the line VII-VII of FIG. 5.

FIG. 10 is a plan sectional view showing another embodiment of eccentric needle in the expansion valve of FIG.

First, referring to FIG. 2, an expansion valve (hereinafter, referred to as “expansion valve”) 100 for an air conditioner of a vehicle according to an embodiment of the present invention throttles a refrigerant flowing from the condenser 70 to evaporator ( 80 is supplied to, and the opening degree is controlled by the refrigerant flowing from the evaporator 80 to the compressor 60, the air conditioner 50 performs the function of throttling and flow rate control. As a result of the operation of the air conditioner 80 in which the expansion valve 100 is installed, the refrigerant introduced into the compressor 60 is compressed in a state of high temperature and high pressure in the compressor 60 and then condensed in the condenser 70. do. The condensed refrigerant is throttled in the expansion valve 100, and then evaporates in the evaporator 80. The vaporized gas is introduced into the expansion valve 100 and used to control the opening degree of the expansion valve 100, and then flows back into the compressor 60. By the way, in one embodiment of the present invention is configured such that all the refrigerant flowing out of the evaporator 80 is introduced into the expansion valve 100, the present invention is not limited to this, and some of the refrigerant from the evaporator 80 Bypass may be introduced into the expansion valve (100).

Referring to FIGS. 3 and 4, the expansion valve 100 includes a valve body 110, a first bracket 120, a second bracket 130, and a third bracket 140 on the outer structure. Internally, the valve unit 160, the driving unit 150, and the elastic member 170 are included.

First, the valve body 110 has a rectangular pillar shape as a whole. However, this may have a cylindrical shape in addition to the rectangular pillar shape as an embodiment.

The lower surface 111 of the valve body 110 is formed with a first port 114 through which the refrigerant flows from the condenser 70 in the longitudinal direction (Z direction).

In addition, the second port 115 is supplied to the evaporator along the X direction (+) by the refrigerant flowing from the first port 114 is confined to the first side surface 112, which is the front of the valve body 110. And a third port 116 spaced apart from an upper portion of the second port 115 at the first side 112 and into which a refrigerant flows in the X direction (−) from the evaporator outlet for controlling the opening degree. Is formed.

In addition, a fourth port 117 is formed on the second side surface 113 of the valve body 110 to allow the refrigerant flowing into the third port 116 to flow out of the compressor along the Y direction.

Here, the first side surface 112 and the second side surface 113 are adjacent to each other, and form a right angle direction (X direction-Y direction) with each other.

The first port 114 is a condenser outlet pipe 101 is inserted into the refrigerant flows from the condenser outlet. The second port 115 is inserted into the evaporator inlet pipe 102, the refrigerant throttled by the expansion valve 100 is supplied to the evaporator inlet. The third port 116 is inserted into the evaporator outlet pipe 103, the refrigerant flows from the evaporator outlet. In the fourth port 117, the compressor inlet pipe 104 is inserted, and the refrigerant flowing into the third port 116 flows out into the compressor inlet.

The first bracket 120 serves to mount the condenser outlet pipe 101 inserted into the first port 114 on the bottom surface 111 of the valve body 110. The first bracket 120 is in close contact with the bottom surface 111 of the valve body 110 and is fitted through the condenser outlet pipe 101. At this time, the first bracket 120 is fixed to the valve body 110 by a first fastening means 122, the first bracket 120 is the first fastening means as the first fastening means 122 are fastened By pressurizing the flange portion 101d, the condenser outlet pipe 101 is tightly fixed to the valve body 110. Here, the first fastening means 122 may be one or a plurality of fastening bolts that are inserted into the lower side of the valve body 110 from the outside of the first bracket 120 to be screwed in.

The second bracket 130 serves to mount the evaporator inlet pipe 102 and the evaporator outlet pipe 103 on the first side 112 of the valve body 110. The second bracket 130 is disposed in close contact with the first side 112 of the valve body 110 in parallel, and the evaporator inlet pipe 102 and the evaporator outlet pipe 103 are spaced apart in the vertical direction. It is inserted. At this time, the second bracket 130 is fixed to the valve body 110 by a second fastening means 132, the second fastening means 132 is the second bracket (1) at the first side 112 130) is a fastening bolt inserted through.

The third bracket 140 serves to mount the compressor inlet pipe 104 inserted into the fourth port 117 to the second side 113 of the valve body 110. The third bracket 140 is disposed in close contact with the second side surface 113 of the valve body 110 and fitted into the compressor inlet pipe 104. In this case, the third bracket 140 is fixed to the valve body 110 by a third fastening means 142, and the third bracket 140 is secondly fastened by the third fastening means 142. The compressor inlet pipe 104 is fixed to the valve body 110 by pressing the flange portion 104a. Here, the third fastening means 142 is a fastening bolt that is penetrated through the second side 113 of the valve body 110 from the outside of the third bracket 140 to be screwed.

Here, the condenser outlet pipe 101 is inserted into the first port 114, and the insertion portion 101a, the bent portion 101b, the extension portion 101c and the first flange portion 101d. ). The insertion portion 101a is inserted into and fixed upward from the lower portion of the valve body 110, and the insertion portion 101a is inserted into and fixed to the first inner flow passage 192. The extension portion 101b is formed to extend in the Y direction in parallel with the compressor inlet pipe 104. The bent portion 101c has the insertion portion 101a disposed in the vertical direction (Z direction) so as to communicate with the first inner flow passage 192 and the direction parallel to the compressor inlet pipe 104 (Y direction). By connecting the extension portions 101c disposed to each other, the flow direction of the refrigerant flowing from the extension portion 101c is changed to the direction in which the first internal flow passage 192 is formed. The first flange portion 101d is formed to protrude radially in the inserting portion, and faces the lower surface 111 of the valve body 110 to support the condenser outlet pipe 101 in a direction of insertion. It plays a role. Therefore, the condenser outlet pipe 101 extends in a curved shape so as to be parallel to the compressor inlet pipe 104, and further, the extension direction of the condenser outlet pipe 101 and the compressor inlet pipe 104 and the evaporator inlet. The extending direction of the pipe 102 and the condenser outlet pipe 101 is formed perpendicular to each other.

In addition, the compressor inlet pipe 104 is inserted into and fixed to the fourth port 117 and extends in an outward direction (Y direction) of the second side surface 113. A second flange portion 104a is formed at an insertion end of the compressor inlet pipe 104 so as to protrude in a radial direction, and the second flange portion 104a has a second side surface 113 of the valve body 110. It is in contact with the engaging projection (not shown) formed in the serves to support the compressor inlet pipe 104 in the direction of insertion.

Here, the first and

second flange portions

101d and 104a are integrally formed with the condenser outlet pipe 101 and the compressor inlet pipe 104 and are bent to protrude in a radial direction. The insertion portion 101a, the bent portion 101b, the extension portion 101c and the first flange portion 101d have an integral structure. In addition, although not shown, the third and fourth flange portions are formed to protrude from the insertion ends of the evaporator inlet pipe 102 and the evaporator outlet pipe 103, and the third and fourth flange portions are formed on the second bracket ( 130 and the first side 112 of the valve body 110, the detailed description of which is the first and second flange portion of the condenser outlet pipe 101 and the compressor inlet pipe 104 Since it is substantially the same as (101d, 104a), it will be omitted.

Next, the internal configuration of the expansion valve 100 with reference to Figures 5 and 6, the inside of the valve body 110, the throttle passage 191, the first internal passage 192, and 2, an internal flow passage 193 is formed, and the valve body 110 is provided with a valve unit 160, a driving unit 150, an elastic member 170, a sealing member 180, and a bush 181.

The throttle passage 191 is formed in the vertical direction (Z-axis direction) of the valve body 110 and a portion in which the refrigerant flowing into the first port 114 and flowing out of the second port 115 is throttled. to be.

The first internal flow passage 192 communicates with the throttle flow passage 191 and the first port 114 to flow out the coolant introduced from the first port 114 to the throttle flow passage 191. The refrigerant flowing through the first internal passage 192 is generally at a high pressure.

The second internal flow passage 193 communicates with the third port 116 and the fourth port 117 and flows out the refrigerant introduced into the third port 116 to the fourth port 117. In this case, the refrigerant flowing through the second internal flow path 193 is generally at a low pressure.

A through hole 118 is formed in the valve body 110 along the up and down direction so as to pass through the first inner flow passage 192 and the second inner flow passage 193.

The valve unit 160 includes a needle 163, a sleeve 161, and a support spring 164.

The needle 163 is slidably inserted into the through hole 118 and moves along the vertical direction.

The sleeve 161 is coupled to one end of the needle 163 and moves in accordance with the movement of the needle 163 and is installed on the throttle passage 191 to adjust the opening degree of the throttle passage 191. . The side of the sleeve 161 is formed to protrude integrally the sleeve supporting member 161a, the upper end is provided with a sleeve ball 162. Here, the sleeve ball 162 may be formed integrally with the sleeve 161.

The support spring 164 is installed on the first inner flow passage 192, and a lower portion of the sleeve 161 is inserted into an upper inner circumferential surface thereof, and an upper surface thereof is disposed on a lower surface 111 of the sleeve support member 161a. The sleeve 161 is elastically supported upward while being in contact.

On the other hand, the present embodiment is installed on the first inner passage 192, the flow hole 165a is formed in the center portion, the lower portion of the support spring 164 is inserted into the inner circumferential side and the support spring ( A throttle member 165 supporting the upper portion 164 is further included.

Here, the throttle member 165 is disposed on the first inner flow passage 192 to absorb noise generated when the liquid refrigerant including bubbles passes through the throttle flow passage 191 when the bubbles expand. It serves to reduce. Looking at the throttle member 165 in detail, the throttle member 165 has a flow hole 165a is formed in the center portion so that the refrigerant flowing through the first port 114 flows into the throttle flow passage 191. The area of the flow hole 165a lowers the pressure of the refrigerant when the refrigerant passes therethrough so that the bubbles contained in the refrigerant expand and burst, and bubbles are formed on sidewalls formed around the flow hole 165a. It is formed smaller than the area of the first internal flow path 192 so as to make the bubbles to be miniaturized by hitting. In this case, the area of the flow hole 165a may be selectively adjusted according to the area of the first internal flow path 192, the flow rate of the refrigerant flowing therein, the size of the bubble to be miniaturized, and the like. The shape may be various, such as a polygon including a circle or a hexagon.

On the other hand, the throttle member 165 may adjust the elastic force of the support spring 164 by moving in the vertical direction of the first internal passage 192 according to the flow rate of the refrigerant, the design of the expansion valve 100, and the like. To this end, a first screw thread 192a is formed on an inner circumferential surface of the first inner flow passage 192, and a second screw thread corresponding to the first screw thread 192a is screwed on an outer circumferential side surface of the throttle member 165. 165a is formed. Here, in the present embodiment, the throttle member 165 is screwed on the first internal flow path 192 as an example, but this is an embodiment using the support jaw and the like rather than the screw coupling method. Of course, the position of the throttle member 165 may be fixed, and the flow hole 165a may be formed in a hexagonal shape corresponding to the hexagonal wrench to facilitate fastening of the throttle member 165 through the hexagonal wrench. have.

As described above, the expansion valve 100, the finer bubbles are first refined while passing through the flow hole (165a) of the throttle member 165, and then the bubbles are passed through the support spring 164 By colliding and bursting, the bubbles are secondly refined, and as a result, most of the bubbles contained in the refrigerant can be removed, thereby greatly reducing the noise caused by the bubbles.

The driving unit 150 is coupled to the upper portion of the valve body 110, and moves the needle 163 in the vertical direction by the refrigerant introduced into the third port 116 using the principle of the diaphragm. Play a role. In detail, the driving unit 150 includes a diaphragm 151, a buffer plate 152, and a stopper 158 on which the elastic member 170 is seated.

The diaphragm 151 is deformed by temperature, and has a characteristic of being deformed by a refrigerant flowing from the third port 116. An upper cap 155 is coupled to an upper portion of the diaphragm 151, and an outer cap 156 covering the upper cap 155 is disposed on an upper portion of the upper cap 155. Here, the space between the diaphragm 151 and the upper cap 155 is an upper pressure chamber 153, a temperature-sensitive gas is enclosed in the upper pressure chamber 153, and the upper pressure chamber 153 is It is sealed by the sealing member 157. A lower pressure chamber 154 is formed in the lower space of the diaphragm 151, and the buffer plate 152 is installed in the lower pressure chamber 154.

The buffer plate 152 is connected to the diaphragm 151 to reciprocate in the vertical direction according to the deformation of the diaphragm 151, and is coupled to one end of the needle 163 to connect the needle 163. Move in the vertical direction.

As described above, the expansion valve 100 allows the refrigerant introduced through the third port 116 to change the temperature of the temperature reduction gas in the upper pressure chamber 153 through the lower pressure chamber 154. The diaphragm 151 moves and reciprocates the buffer plate 152 in the up and down direction by the temperature change of the degassing gas. Thus, the needle 163 and the sleeve 161 are moved up and down. The opening degree of the throttle passage 191 is adjusted by moving. Here, reference numeral 159 denotes a gasket.

Meanwhile, referring to FIGS. 7 and 8, the stopper 158 has an insertion hole 1571 formed at the center thereof, and the needle 163 is inserted through the insertion hole 1581, and the insertion hole is formed. A seating portion 1582 is formed around the periphery of 1158. The stopper 158 is formed with one or a plurality of

inflow holes

1583, 1584, and 1585 through which the refrigerant communicates with the second internal flow path 193. Here, the inflow holes 1583, 1584, and 1585 are passages of the refrigerant for reducing the temperature of the lower pressure chamber 154, and the number, shape, and size thereof may be variously adjusted according to the heat transfer degree of the refrigerant. .

The elastic member 170 has a fitting hole 171 into which the needle 163 is inserted, and is seated on the seating portion 1852 of the stopper 158. Here, the elastic member 170 supports the outer circumferential surface of the needle 163 inserted into the fitting hole 171 to guide the needle 163. The elastic member 170 may be an O-ring that is easy to manufacture and handle, but is not limited thereto.

In addition, referring to Figure 9, the elastic member 170, the center of the fitting hole 171 to form an eccentric (ΔP), and the upper portion of the needle 163 inserted into the elastic member 170 The center of the lower portion of the needle 163 is eccentric so that the needle 163 is inclined in the vertical direction. When the needle 163 is inclined in the vertical direction as described above, some side surfaces of the needle 163 come into contact with a part of the inner side surface of the through hole 118 to friction against vibration of the needle 163. By imparting resistance and restraining the movement of the needle 163, irregular movement of the needle 163 may be prevented. Accordingly, the elastic member 170 supports and guides the outer circumferential surface of the needle 163 and inclines the needle 163 in the vertical direction so that some side surface of the needle 163 is always in the through hole 118. By being in contact with the inner surface of the), it is possible to effectively prevent the hunting of the needle 163 by preventing vibration or repeated impact.

The sealing member 180 is disposed in the through hole 118 so that the needle 163 is inserted and is supported downward on the stepped portion formed in the through hole 118 so as not to be separated into the first inner flow passage 192. In addition, the first internal flow path 192 through which the high-pressure refrigerant flows and the second internal flow path 193 through which the low-pressure refrigerant flows serve to prevent leakage.

In addition, the expansion valve 100 is inserted into the through hole 118 while the needle 163 is penetrated, thereby preventing the sealing member 180 from being separated into the second internal flow path 193. A bush 181 is further included.

Meanwhile, the bush 181 not only prevents detachment of the sealing member 180, but also the contact area between the refrigerant and the needle 163 by the bush 181 wrapping a portion of the needle 163. By controlling the, it also serves to adjust the heat transfer rate from the refrigerant to the needle (163). In detail, one end of the bush 181 is formed to be exposed on the second inner flow passage 193, thereby adjusting the contact area between the refrigerant of the second inner flow passage 193 and the needle 163. The heat transfer rate from the refrigerant to the needle 163 is adjusted. As such, according to the present exemplary embodiment, hunting of the needle 163 may be effectively prevented by adjusting a contact area between the refrigerant and the needle 163 through the bush 181. For this reason, first, the hunting of the needle 163 is caused by the drive unit 150 reacting too sensitively to the temperature of the coolant to cause a fast or unstable shaking or vibration, and the drive unit 150 may Since it reacts more rapidly and reacts faster than heat transfer by conduction of the needle 163 rather than heat transfer by convection, the driving unit 150 is insensitive to the temperature of the refrigerant by controlling the temperature of the needle 163. This is because it is possible to suppress the sensitive reaction by the refrigerant, thereby effectively preventing hunting of the needle 163.

In addition, the expansion valve 100 may include the through hole 118, the second internal flow path 193, the throttle flow path 191, the first internal flow path 192, and the first port 114. It is arranged to be aligned in the vertical direction. For this reason, the first inner passage 192 and the first port 114 are disposed in different directions, respectively, so that the machining of the first inner passage 192 and the machining of the first port 114 are performed separately. Compared to the conventional expansion valve 100, the expansion valve 100 is a one-way processing of the throttle flow passage 191, the first inner flow passage 192 and the first port 114 to facilitate processing. It is possible to reduce the processing time and it is easy and economical.

Referring to FIG. 10, the expansion valve 100 uses the elastic member 170 having the fitting hole 171 formed therein as shown in FIG. 5 to prevent hunting of the needle 163. The needle 163a is eccentrically inserted and installed in the through hole 118 without arranging the inclined portion 163 in an up and down direction, so that a part of the outer circumferential side of the needle 163a is in the through hole 118. Hunting of the needle 163a may be prevented by contacting the side surface. In this case, since a portion of the outer circumferential side surface of the needle 163a is in contact with the inner surface of the through hole 118, the needle restrains the movement of the needle and has a frictional force with the valve body 110. The hunting of 163a) can be prevented.

Meanwhile, in the present embodiment, the first port 114 is on the lower surface 111, the second port 115 and the third port 116 are on the first side surface 112, and the fourth port 117. ) Is an embodiment of the valve body 110 formed on the second side 113, but this is a preferred embodiment, each port is formed on the first side 112 and the second side 113, respectively The valve body of various structures can be applied.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The present invention can be used in the air conditioner of a vehicle.

Claims

An expansion valve for an air conditioner for a vehicle in which a refrigerant flowing from a condenser is throttled and supplied to an evaporator, and the opening degree is controlled by the refrigerant flowing from the evaporator and flowing out to the compressor.

A first port formed on a lower surface of the refrigerant from the condenser, a second port formed on the first side, and a refrigerant introduced from the first port is throttled and supplied to the evaporator, and the second side of the second side A third port formed at an upper portion of the port and spaced apart from the evaporator, and a fourth port formed at a second side surface adjacent to the first side surface and the refrigerant flowing into the third port flowing out of the compressor; And an throttling flow path through which the refrigerant flowing into the first port and flowing out of the second port is throttled, and the refrigerant flowing into the first port in communication with the throttling flow path and the first port. A first internal flow passage flowing out of the throttle flow passage and a second internal flow passage communicating with the third port and the fourth port and flowing out the refrigerant flowing into the third port into the fourth port; 1 inside And the second valve body are formed through-holes formed along a vertical direction so as to pass through the inner channel in;

A valve unit having a needle inserted into the through hole and movable in the vertical direction, and a sleeve coupled to one end of the needle to adjust an opening degree of the throttle passage according to the movement of the needle;

A driving unit coupled to the valve body and moving the needle in the vertical direction by the refrigerant introduced into the third port; And

And an elastic member inserted into and coupled to the needle to prevent lateral vibration of the needle and allowing the needle to incline in the vertical direction.
The method according to claim 1,

And a sealing member disposed in the through hole, the needle being inserted into the needle and being supported downward on a step formed in the through hole, the sealing member maintaining airtightness between the first inner flow passage and the second inner flow passage. Expansion valve.
The method according to claim 2,

And a bush inserted into the through hole while the needle is penetrated, to prevent the sealing member from being separated into the second internal flow path.
The method according to claim 3,

One end of the bush is formed to be exposed on the second internal flow path, and one end of the exposed bush covers the portion of the needle to adjust the contact area of the coolant and the needle, from the coolant to the needle. Expansion valve for air conditioner of vehicle to control heat transfer rate.
The method according to claim 1,

The driving unit,

A diaphragm deformed by the refrigerant flowing from the third port, a buffer plate connected to the diaphragm and coupled with the needle to move the needle in the vertical direction, and the needle is inserted and the elastic An expansion valve for an air conditioner of a vehicle including a stopper on which a member is seated and one or a plurality of inflow holes are formed through which the refrigerant communicates with the second internal oil.
The method according to claim 1,

A throttle is disposed on the first internal flow path, and has a flow hole formed therein so that the refrigerant flowing through the first port flows into the throttle flow path, and the area of the flow hole is smaller than the area of the first internal flow path. Expansion valve for an air conditioner of a vehicle further comprising a member.
An expansion valve for an air conditioner for a vehicle in which a refrigerant flowing from a condenser is throttled and supplied to an evaporator, and the opening degree is controlled by the refrigerant flowing from the evaporator and flowing out to the compressor.

A first port formed on a lower surface of the refrigerant from the condenser, a second port formed on the first side, and a refrigerant introduced from the first port is throttled and supplied to the evaporator; A third port spaced apart from the upper portion of the second port and into which the refrigerant flows from the evaporator, and a fourth port formed on the second side surface adjacent to the first side surface and the refrigerant flowing into the third port flows out to the compressor A throttle passage through which a refrigerant flowing into the first port and flowing out of the second port is throttled; and the refrigerant flowing into the first port in communication with the throttle passage and the first port. A first internal flow passage flowing into the throttle flow passage and a second internal flow passage communicating with the third port and the fourth port and flowing out the refrigerant flowing into the third port into the fourth port; The first A valve body with a through-hole formed along a vertical direction so as to pass through the flow path and the second internal flow path is formed;

A needle which is eccentrically inserted into the through hole so that a portion of the outer circumferential side is in contact with the inner surface of the through hole and is movable along the up and down direction, and is coupled to one end of the needle to open the throttle passage according to the movement of the needle A valve unit having a sleeve for adjusting the; And

And a driving unit coupled to the valve body and configured to move the needle in the vertical direction by the refrigerant introduced into the third port.
An expansion valve for an air conditioner for a vehicle in which a refrigerant flowing from a condenser is throttled and supplied to an evaporator, and the opening degree is controlled by the refrigerant flowing from the evaporator and flowing out to the compressor.

A first port through which the refrigerant flows from the condenser, a second port through which the refrigerant introduced from the first port is condensed and supplied to the evaporator, a third port through which the refrigerant flows from the evaporator, and a third port And a fourth port through which the introduced refrigerant flows out into the compressor, and an throttle passage through which the refrigerant flowing into the first port and flowing out to the second port is throttled, and communicating with the throttle passage and the first port. And a first internal flow path through which the refrigerant introduced into the first port flows out into the throttle flow passage, and the refrigerant introduced into the third port through communication with the third port and the fourth port. A valve body having a second inner flow passage formed therein and a through hole formed along the vertical direction so as to pass through the first inner flow passage and the second inner flow passage;

A valve unit having a needle inserted into the through hole and movable in the vertical direction, and a sleeve coupled to one end of the needle to adjust an opening degree of the throttle passage according to the movement of the needle;

A driving unit coupled to the valve body and moving the needle in the vertical direction by the refrigerant introduced into the third port;

A sealing member disposed in the through hole and inserted into the needle and supported downward by a step formed in the through hole, the sealing member maintaining airtightness between the first inner passage and the second inner passage; And

And an elastic member disposed on the driving unit and supporting the needle to insert the needle to prevent lateral vibration of the needle.
The method according to claim 8,

The driving unit,

A diaphragm deformed by the refrigerant flowing from the third port, a buffer plate connected to the diaphragm and coupled with the needle to move the needle in the vertical direction, and the needle through an insertion hole A stopper which is inserted, a seating portion is formed around the insertion hole, and one or a plurality of inflow holes are formed through which the refrigerant is communicated from the second internal flow path,

The elastic member is an expansion valve for an air conditioner of a vehicle seated on the seating portion of the stopper.
An expansion valve for an air conditioner for a vehicle in which a refrigerant flowing from a condenser is throttled and supplied to an evaporator, and the opening degree is controlled by the refrigerant flowing from the evaporator and flowing out to the compressor.

A first port through which the refrigerant flows from the condenser, a second port through which the refrigerant introduced from the first port is condensed and supplied to the evaporator, a third port through which the refrigerant flows from the evaporator, and a third port And a fourth port through which the introduced refrigerant flows out into the compressor, and an throttle passage through which the refrigerant flowing into the first port and flowing out to the second port is throttled, and communicating with the throttle passage and the first port. And a first internal flow path through which the refrigerant introduced into the first port flows out into the throttle flow passage, and the refrigerant introduced into the third port through communication with the third port and the fourth port. A valve body having a second inner flow passage formed therein and a through hole formed along the vertical direction so as to pass through the first inner flow passage and the second inner flow passage;

A valve unit having a needle inserted into the through hole and movable in the vertical direction, and a sleeve coupled to one end of the needle to adjust an opening degree of the throttle passage according to the movement of the needle;

A driving unit coupled to the valve body and moving the needle in the vertical direction by the refrigerant introduced into the third port;

A sealing member disposed in the through hole and inserted into the needle and supported downward by a step formed in the through hole, the sealing member maintaining airtightness between the first inner passage and the second inner passage; And

The needle is inserted into the through hole to prevent the sealing member from being separated into the second internal flow path, and one end is formed to be exposed on the second internal flow path, so that the exposed one end is exposed to the needle. And a bush which adjusts a heat transfer rate from the refrigerant to the needle by adjusting a contact area of the needle with the refrigerant by wrapping a portion of the expansion valve.
The method according to claim 10,

And an elastic member disposed in the driving unit and supporting the needle to insert the needle to prevent lateral vibration of the needle.
The method according to claim 1 or 8,

The elastic member, the expansion valve for an air conditioner of a vehicle to form the fitting hole into which the needle is eccentric so that the needle is inclined in the vertical direction.
The method according to claim 1 or 8,

The elastic member is an O-ring expansion valve for a vehicle air conditioner.
The method according to claim 8 or 10,

The first port is formed on the lower surface of the valve body, the second port is formed on the first side of the valve body, the third port is formed spaced apart from the upper portion of the second port on the first side surface. And the fourth port is formed on the second side surface adjacent to the first side surface.