KR101170846B1 - Expansion valve for rear car air conditioner - Google Patents

Abstract

The present invention relates to an expansion valve for a vehicle rear air conditioner, wherein when the operation of the rear air conditioner is stopped, the refrigerant can be circulated at a predetermined flow rate between the compressor and the rear air conditioner, thereby providing a refrigerant between the compressor and the rear air conditioner. The contained oil can be supplied to the compressor, and the object is to reduce the noise when the refrigerant flows.

The expansion valve of the present invention, even in the state in which the orifice 136 is closed by the ball valve 160, the expansion passage communicating with the high-pressure inlet 132 connected to the receiver dryer, and the expansion communicating with the rear seat evaporator The discharge part 134 is provided with a bleed hole 140 which communicates with each other without passing through the orifice 136. In the expansion discharge portion, a connection port 143 for communicating the inside of the bleed hole and a dispersion ring extending from the inner peripheral surface corresponding to the connection port toward the connection port and dispersing the refrigerant discharged from the connection port ( A bush 142 having a refrigerant dispersing protrusion 144 formed on an outer circumferential surface of the second surface 145 is press-fitted.

Vehicle, car, front seat, rear seat, air conditioning, expansion valve, oil, circulation, compressor, lubrication

Description

Expansion valve for vehicle rear air conditioner {EXPANSION VALVE FOR REAR CAR AIR CONDITIONER}

1 is a configuration diagram illustrating a vehicle to which a dual air conditioner is applied.

2 is a cross-sectional view showing an expansion valve for a conventional vehicle rear air conditioner.

3 is a graph showing a change in oil circulation rate with time when the conventional vehicle rear air conditioner is stopped.

4 is a cross-sectional view showing an example of an expansion valve for a vehicle rear air conditioner according to the present invention.

5 is an enlarged view illustrating main parts of an expansion valve for a rear seat air conditioner according to the present invention.

Fig. 6 is a perspective view showing a bush constituting an expansion valve for a rear seat air conditioner according to the present invention.

7 is a cross-sectional view showing a bush constituting an expansion valve for a vehicle rear air conditioner according to the present invention.

8 and 9 are graphs showing changes in oil circulation rate with time when the vehicle rear-vehicle air conditioner to which the expansion valve is applied according to the present invention is stopped, respectively.

<Explanation of symbols for the main parts of the drawings>

120: low pressure refrigerant flow path, 130: high pressure refrigerant flow path,

132: high pressure inlet, 134: expansion discharge,

136: Orifice, 140: Bleed Hole,

142: Bush, 143: connection port,

144: refrigerant dispersion projections, 145: dispersion ring,

150: communication path, 160: ball valve,

170: pressure transfer rod, 180: thermostat.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion valve for a vehicle rear air conditioner, and in particular, when only the front air conditioner is operated and the rear air conditioner is stopped, the flow of stagnant refrigerant between the compressor and the rear air conditioner is expanded. By circulating through the bleed hole of the oil, the oil contained in the refrigerant between the compressor and the rear seat air conditioner can be supplied to the compressor, it is possible to reduce the noise when the refrigerant flows through the bleed hole An expansion valve for a vehicle rear air conditioner.

The vehicle rear seat air conditioner is applied to a large-sized vehicle, RV vehicle (Recreational Vehicle), or a luxury vehicle so that the cabin air conditioner alone cannot cool / heat the vehicle comfortably. It is installed in an enclosed space behind the body to form a dual air conditioner. An example of a vehicle to which such a dual air conditioning apparatus is applied is shown in FIG. 1.

The dual air conditioner shown in FIG. 1 includes a front seat air conditioner 10 and a rear seat air conditioner 30.

The electric seat air conditioner (10) includes a compressor (12) for compressing and discharging a refrigerant; A condenser 14 for condensing the refrigerant discharged from the compressor 12; A receiver dryer (16) for gas-liquid separation of the refrigerant condensed by the condenser (14); An expansion valve 18 for all seats for expanding the refrigerant discharged from the receiver dryer 16; It is built in the air-conditioning case for all seats 20, heat-exchanges the refrigerant | coolant supplied from the said seat expansion valve 18, and the air blown from the all seat blower 26, and sends the said refrigerant | coolant to the said compressor 12, And evaporator 22 for changing the air into cold; And, the heater core for heating (core Heater Core 24) is built in the air-conditioning case 20 for the heat exchanger to heat the cooling water flowing inside and the air blown from the electric blower 26 for changing the air to warmth; It is made, including.

In addition, the rear seat air conditioner 30, the rear seat expansion valve 34 for expanding the refrigerant discharged from the receiver dryer 16 of the front seat air conditioner (10); It is built in the air conditioner case 32 for rear seats and heat exchanges the refrigerant supplied from the rear seat expansion valve 34 and the air blown from the ?? blower 40 to send the refrigerant to the compressor 12. In addition, the rear seat evaporator 36 for converting the air into cold; And a rear heater core 38 which is built in the rear air conditioner 32 and heat exchanges the cooling water flowing therein with the air blown from the rear air blower 40 to change the air to warmth. It is done by

Meanwhile, the front seat expansion valve 18 or the rear seat expansion valve 34 is installed at the inlet of the front seat evaporator 22 or the rear seat evaporator 36 to discharge the high temperature and high pressure refrigerant discharged from the receiver dryer 16. It expands and converts into a low pressure state of the hearth, and feeds it to an evaporator, thereby increasing the evaporation efficiency.

In addition, since the heat load of the vehicle air conditioner is changed by the outside temperature, humidity, the number of passengers, the number of revolutions of the compressor 12, and the like, the cycle of the vehicle is circulated in order to maximize the capability of each device corresponding to the change. It is necessary to adjust the amount of refrigerant, and the expansion valves 18 and 34 also function to adjust the amount of refrigerant.

In addition, if the heat load is large in a state where the amount of refrigerant is constant, the refrigerant evaporates completely when the refrigerant reaches the outlets of the evaporators 22 and 36 and absorbs heat more, so that the temperature of the refrigerant gas reaches a superheated state higher than the evaporation temperature. If the degree of superheat is small, there is no problem, but if it is large, the discharge temperature of the compressor 12 increases, and the cylinder (not shown) of the compressor 12 is heated. On the contrary, if the heat load is small, the refrigerant at the outlets of the evaporators 22 and 36 is small. Since the evaporation of the refrigerant is not completely performed and the refrigerant is sucked into the compressor 12 in a state containing a liquid phase, liquid compression is caused, and thus a valve unit (not illustrated) of the compressor 12 is damaged. The expansion valves 18 and 34 also serve to supply an appropriate amount of refrigerant to the evaporators 22 and 36 and maintain the superheat degree in a constant state even when such heat load fluctuations occur.

An example of the rear seat expansion valve 34 of the expansion valves 18 and 34 is illustrated in FIG. 2, wherein the rear seat expansion valve 34 includes: a valve block 50; A low pressure refrigerant passage 52 installed in the transverse direction to connect the outlet of the rear seat evaporator 36 and the compressor 12 to an upper end of the valve block 50; It is installed in the lower end of the valve block 50 in the transverse direction, the high pressure inlet portion 55 connected to the receiver dryer 16, the expansion discharge portion 56 connected to the inlet of the rear evaporator 36 and the high pressure A high pressure refrigerant flow passage (54) having an orifice (57) connecting the inlet portion (55) and the expansion discharge portion (56); A thermostat tube 60 installed at an upper end of the valve block 50; A pressure transfer rod (64) installed on the low-temperature refrigerant passage (52) and the orifice (57) of the high-pressure refrigerant passage (54) from the thermostat (60); In addition, a ball valve (Ball Valve) is installed in the communication path (66) communicating with the orifice (57) and the high pressure inlet (55) to adjust the opening degree of the orifice (57) in conjunction with the pressure transfer rod (64). , 68);

Looking at the operation of the expansion valve 34 for the rear seat as described above, when the refrigerant flows into the high-pressure inlet portion 55 of the high-pressure refrigerant passage 54 from the receiver dryer 16, the shankdong of the pressure transfer rod 64 As the ball 69 of the ball valve 68 moves up and down, the opening degree of the orifice 57 is adjusted. Therefore, the refrigerant introduced into the high pressure inlet 55 may be supplied while the flow rate is adjusted to the rear evaporator 36 through the communication path 66, the orifice 57, and the expansion discharge 56. have. That is, when the temperature of the refrigerant discharged from the rear seat evaporator 36 to the low pressure refrigerant passage 52 decreases, the temperature of the refrigerant is transferred to the temperature reduction tube 60 through the pressure transfer rod 64. Therefore, the temperature of the gas chamber 62 inside the thermostat 60 is lowered, and the diaphragm 61 installed in the thermostat 60 is displaced upward, and accordingly, the pressure transfer rod 64 is raised to raise the orifice. Since the opening degree of 57) becomes small, the refrigerant flow rate decreases. Conversely, when the temperature of the refrigerant flowing in the low pressure refrigerant passage 52 rises, the refrigerant flow rate increases.

However, in the case of a vehicle to which the dual air conditioner as shown in FIG. 1 is applied, when there is no occupant in the rear seat, only the front seat air conditioner 10 is normally operated and the operation of the rear air conditioner 30 is stopped. As the conventional rear seat expansion valve 34 is applied, the orifice 57 is blocked, and the refrigerant circulation between the compressor 12 and the rear seat air conditioner 30 is stagnant. The oil content in the refrigerant flowing into the compressor 12 may be represented by an oil circulation rate (OCR). Since the refrigerant circulation between the compressor 12 and the rear seat air conditioner 30 is stagnant, the refrigerant Oil contained in the refrigerant in a section where circulation is stagnant is not supplied to the compressor 12. Therefore, as shown in FIG. 3, the oil circulation rate decreases from the time when the rear seat air conditioner 30 is shut down, so that the compressor 12 is stuck due to lack of lubrication as the operation time of the compressor 12 passes. Etc. This adversely affects the durability of the compressor 12, and causes a problem that the driving noise of the compressor 12 is severe.

The present invention has been made in view of the above-described conventional problems, and when only the front air conditioner is operated and the rear air conditioner is stopped, the flow of stagnant refrigerant between the compressor and the rear air conditioner is applied to the expansion valve for the rear air conditioner. By circulating through the bleed hole, the oil contained in the refrigerant between the compressor and the rear seat air conditioner can be supplied to the compressor, and an object of the present invention is to reduce noise when the refrigerant flows through the bleed hole. .

In order to achieve the above object, the present invention, the low pressure refrigerant flow path is installed to connect the outlet of the evaporator for the rear seat and the compressor; A high pressure refrigerant flow path having a high pressure inlet connected to a receiver dryer, an expansion discharge connected to an inlet of the rear seat evaporator, and an orifice connecting the high pressure inlet and the expansion discharge; A low temperature refrigerant passage connected to a pressure transfer rod which is installed to be liftable over an orifice of the high pressure refrigerant passage; And, a ball valve installed in the communication passage communicating with the orifice and the high pressure inlet, to adjust the opening degree of the orifice in association with the pressure transfer rod. A bleed hole formed in the valve block so that the refrigerant flows at a constant flow rate even when the orifice is closed, thereby communicating with the communication path and the expansion discharge part; A connection port is formed to communicate the inside of the bleed hole, and a dispersion ring extending from the inner circumferential surface corresponding to the connection port toward the connection port and dispersing a refrigerant discharged from the connection port is provided on the outer circumferential surface thereof. It is characterized in that it further comprises a; (Bush) pressed into the expansion discharge portion.

According to the invention, the diameter of the bleed hole is 2.0mm or more, the diameter of the connection port is preferably 0.3 ~ 0.6mm.

In addition, the dispersion ring, the thickness is preferably thinner toward the edge.

In addition, the refrigerant dispersion protrusion, it is preferable that the diameter decreases toward the end of the connection port from the dispersion ring.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of terms in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

4 shows an expansion valve for a vehicle rear air conditioner according to the present invention.

Expansion valve 100 for a vehicle rear seat air conditioner according to the present invention, the valve block 110, the low pressure refrigerant passage 120, the high pressure refrigerant passage 130, the thermostat tube 180, and the pressure transfer rod ( 170, and a ball valve 160.

The low pressure refrigerant flow path 120 is connected to the outlet of the rear seat evaporator 36 (see FIG. 1) constituting the vehicle rear seat air conditioner 30 (see FIG. 1), and the compressor 12 (see FIG. 1). It is installed in the transverse direction to the upper end of the valve block 110 to connect.

In addition, the high pressure refrigerant passage 130 is installed in the transverse direction at the lower end of the valve block 110 to connect the receiver dryer 16 (see FIG. 1) and the inlet of the rear seat evaporator 36. The high pressure refrigerant passage 130, the high pressure inlet 132 connected to the receiver dryer 16, the expansion discharge unit 134 connected to the inlet of the evaporator 36 for the rear seat, and the high pressure inlet ( 132 and the expansion discharge portion 134 comprises an orifice 136 connecting to each other.

In addition, the temperature reduction tube 180 is installed on the upper end of the valve block 110, the pressure transfer is installed so as to be lifted over the orifice 136 of the low pressure refrigerant passage 120, the high pressure refrigerant passage 130. Is connected to the rod 170, the diaphragm 182 is installed under the gas chamber 184 therein is connected to the pressure transfer rod 170. Accordingly, the temperature of the refrigerant flowing in the low pressure refrigerant passage 120 is transmitted to the gas chamber 184 through the pressure transfer rod 170, and is displaced up and down of the diaphragm 182 according to the pressure change of the gas chamber 184. The pressure transfer rod 170 may be elevated.

The ball valve 160 is to adjust the opening degree of the orifice 136 in conjunction with the pressure transfer rod 170, the communication passage 150 in communication with the orifice 136 and the high pressure inlet 132. Is installed on. The ball valve 160 is disposed in contact with the lower end of the pressure transfer rod 170 to adjust the opening degree of the orifice 136 and the ball 162 through the support plate 166. ) Is provided with a spring 164 elastically supporting.

The expansion valve 100 for the vehicle rear air conditioner according to the present invention, the ball seat air conditioner 10 (see Fig. 1) is operated and the operation of the rear seat air conditioner 30 (see Fig. 1) is suspended Even when the orifice 136 is closed by the valve 160, the refrigerant is circulated between the rear seat air conditioner 30 and the compressor 12, so that oil contained in the refrigerant of the rear seat air conditioner 30 is compressed. In order to be able to smoothly return to the (12), the communication path 150 and the expansion discharge portion 134 is provided with a bleed hole 140 for communicating with each other.

As shown in FIG. 4 and FIG. 5, the bleed hole 140 may be formed to communicate with the expansion discharge part 134 without passing through the orifice 136 from the communication path 150. In this case, the bleed hole 140 is preferably 2.0 mm or more. The reason for the diameter of the bleed hole 140 to be 2.0 mm or more is that, when a hole having a smaller diameter is directly formed in the valve block 110, the diameter of the tool for forming the hole may be small and the tool may be damaged. Because of this, it is considered. That is, considering the mass productivity of the valve block 110, it is preferable to form a bleed hole 140 with a diameter of 2.0mm or more.

4 and 6, a bush 142 having a connection port 143 communicating therewith with the bleed hole 140 may be pressed into the expansion discharge part 134. have. In this case, the diameter of the connection port 143 is preferably smaller than the diameter of the bleed hole 140 in consideration of the flow rate, the diameter of the connection port 143 is preferably 0.3 ~ 0.6mm. That is, since the bush 142 is made of a plastic extrudate, the connection port 143 having a small diameter as described above may be sufficiently formed.

As shown in FIGS. 5 and 7, inside the bush 142, when the rear air conditioner 30 is stopped, refrigerant flows through the bleed hole 140 and the connection port 143. At this time, by dispersing the flow of the refrigerant by preventing the refrigerant from going straight, the refrigerant dispersion protrusion 144 that can prevent the noise during the refrigerant flow is formed. That is, large bubbles may occur while the refrigerant passes through the bleed hole 140 and the connection port 143, and noise may occur due to such bubbles, but the bubbles are crushed by the refrigerant dispersing protrusion 144. In this case, noise during refrigerant flow is prevented.

The refrigerant dispersing protrusion 144 extends from the inner circumferential surface of the bush 142 corresponding to the connection port 143 toward the connection port 143, and disperses the refrigerant discharged from the connection port 143 on the outer circumferential surface thereof. Dispersion ring 145 is formed to be made.

The dispersion ring 145 is preferably thinner toward the edge thereof. For example, the dispersion ring 145 may be thinner in a vertical symmetrical structure.

In addition, the diameter of the refrigerant dispersing protrusion 144 decreases from the dispersing ring 145 toward the end of the connection port 143.

Next, the operation of the expansion valve for vehicle rear air conditioner according to the present invention configured as described above will be described.

When both the front and rear stone air conditioners 10 and 30 constituting the dual air conditioner are operated, the high-pressure inlet portion 132 of the high-pressure refrigerant flow path 130 is formed from the receiver dryer 16 constituting the front seat air conditioner 10. When the refrigerant flows in, the opening degree of the orifice 136 is adjusted according to the lifting and lowering of the ball 162 of the ball valve 160 by the shankdong of the pressure transfer rod 170. Therefore, the refrigerant flowing into the high pressure inlet 132 flows into the communication path 150, and flows to the expansion discharge part 134 through the orifice 136, while the bleed hole 140 and the connection port ( Flow through the expansion discharge portion 134 through 143, it can be supplied to the rear evaporator 36 while the flow rate is adjusted.

Looking at the opening degree control structure of the orifice 136 in more detail, when the temperature of the refrigerant discharged from the rear seat evaporator 36 to the low pressure refrigerant flow path 120 is lowered, through the pressure transfer rod 170 The temperature of the refrigerant is transferred to 180. Therefore, as the temperature of the gas chamber 184 inside the thermostat 180 decreases and the gas therein condenses, the pressure in the gas chamber 184 lowers and the volume is reduced, so that the diaphragm installed inside the thermostat 180 is reduced. 182 is displaced upward. As the pressure transfer rod 170 rises in association with the displacement of the diaphragm 182, the ball 162 of the ball valve 160 rises upward by the elastic force of the spring 164, thereby causing the Since the opening degree is reduced, the refrigerant flow rate is reduced. Conversely, when the temperature of the refrigerant flowing in the low pressure refrigerant passage 120 rises, the refrigerant flow rate increases.

As described above, when both the front and rear air conditioners 10 and 30 of the dual air conditioner are operated, when there is no occupant in the rear seat, only the front seat air conditioner 10 is operated and the rear air conditioner 30 is operated. When it is stopped, the orifice 136 is normally blocked, and thus the refrigerant circulation between the compressor 12 and the rear-seat air conditioner 30 is not established and the oil is contained in the refrigerant in the section where the refrigerant circulation is stagnant. In the present invention, by allowing the refrigerant of a certain flow rate to flow, the refrigerant of a constant flow rate can be circulated between the compressor 12 and the rear seat air conditioner 30.

That is, as the refrigerant of the high pressure inlet 132 flows to the expansion discharge unit 134 through the communication path 150, the bleed hole 140, and the connection port 143, the rear-seat air conditioner 30 and The refrigerant can be circulated at a predetermined flow rate between the compressors 12.

As described above, when the refrigerant circulates between the compressor 12 and the rear seat air conditioner 30 at a predetermined flow rate, the oil contained in the refrigerant in the section can be smoothly supplied to the compressor 12, and thus the compressor 12 The lack of lubrication can be prevented.

8 and 9, respectively, a graph showing a change in the oil circulation rate with time when the operation of the vehicle rear-mounted air conditioner to which the expansion valve according to the present invention is stopped is shown, Figure 8 is a bleed hole 140 Shows a case where the diameter of 0.3mm is applied, and FIG. 9 shows a case where the diameter of the bleed hole 140 is applied to 0.4mm. As shown in the graphs of FIGS. 8 and 9, even when the operation of the rear seat air conditioner 30 is stopped, the oil is circulated through the bleed hole 140 so that the oil circulation rate does not decrease with time. It can be seen that 12 is smoothly supplied.

Table 1 below shows the expansion valves to which the present invention is applied, and the conventional expansion valve to which the bleed hole is not applied, in the case of the dual mode in which both the front and rear seat air conditioners are operated, and the rear seat air conditioner. In the case of the Single mode in which the operation was stopped and only the air conditioner was operated, the oil circulation rate, the refrigerant flow rate, and the vent temperature were compared.

division Bleed
Hole (mm) behavior
time
(HR) Oil circulation rate (%) Refrigerant Flow Rate (Kg / h) Vent temperature (℃) Dual single Dual single Dual
(order) single
(I'm) I'm after I'm after Conventional none One 8.0 3.4 236 167 271 - 34.7 /
35.2 33.2 2 2.2 - 33.3 4 1.8 - 33.1 Invention 1 0.6 One 8.2 8.8 236 180 261 51 34.9 /
35.8 34.7 2 8.9 49 34.5 Inventive 2 0.5 One 8.0 7.8
(White radish) 240 174 262 22 35.0 /
35.8 34.2 2 7.9
(White radish) 22 33.9 Inventive 3 0.4
(210cc) One 8.4 7.7 242 176 265 17 34.7 /
35.5 33.9 2 7.7 17 34.3 Inventive 4 0.4
(240cc) One 9.1 8.4 243 176 266 18 35.2 /
35.3 34.3 2 8.3 17 34.3 Inventive 5 0.3 One 8.3 6.7 240 178 266 11 35.2 /
36.1 33.9 2 6.7 11 33.8

As shown in Table 1, when the single mode is operated, compared with the conventional expansion valve, not only the oil circulation rate of the expansion valve of the present invention is significantly higher, but also the oil circulation rate does not drop over time. In addition, it was found that the cooling performance did not deteriorate with time even when the refrigerant having a predetermined flow rate circulated between the compressor and the rear seat air conditioner.

On the other hand, during the flow of the refrigerant supplied from the high-pressure inlet 132 to the communication path 150 through the bleed hole 140 and the connection port 143 to the expansion discharge unit 134, the refrigerant dispersion protrusion 144 Along the pointed outer circumferential surface of the end of the flow to the distribution ring 145 can be distributed in all directions. At this time, by crushing the bubbles that may occur while the refrigerant passes through the bleed hole 140 and the connection port 43 by the refrigerant dispersion protrusion 144, it is possible to prevent noise.

According to the expansion valve for the vehicle rear air conditioner according to the present invention configured as described above, even when the operation of the rear air conditioner is stopped and only the front seat air conditioner is operated, through the bleed hole 140 formed in the expansion valve, Since the refrigerant flowing into the high pressure inlet 132 from the receiver dryer may flow to the expansion discharge unit 134 connected to the rear seat evaporator at a predetermined flow rate, the refrigerant circulation between the compressor and the rear seat air conditioner may be performed. Therefore, the oil contained in the refrigerant between the compressor and the rear seat air conditioner can be smoothly supplied to the compressor, which adversely affects the durability of the compressor such as the compressor is stuck due to lack of lubrication as the compressor operating time passes. Can be prevented, and thus the compressor life can be extended by protecting the compressor. In addition, the driving noise of the compressor can be reduced by the increase in the lubrication effect.

In addition, the refrigerant supplied from the high pressure inlet 132 to the communication path 150 flows to the expansion discharge part 134 through the bleed hole 140 and the connection port 143, the refrigerant dispersion protrusion 144 The flow is guided along the pointed outer circumferential surface of the end of the dispersion ring 145 is not only dispersed in all directions, but also dispersed in the refrigerant bubble bubbles that may occur as the refrigerant passes through the bleed hole 140 and the connection port 143 Since the projections 144 are crushed finely, noise during the refrigerant flow can be reduced.

Claims (4)

A low pressure refrigerant passage (120) installed to connect the outlet of the rear seat evaporator and the compressor; A high pressure inlet 132 connected to a receiver dryer, an expansion discharge unit 134 connected to an inlet of a rear seat evaporator, and an orifice 136 connecting the high pressure inlet unit and an expansion discharge unit to each other. A high pressure refrigerant passage 130; A low temperature refrigerant passage, and a thermostat tube 180 connected to a pressure transfer rod 170 installed to be liftable over an orifice of the high pressure refrigerant passage; And a ball valve (160) installed in the communication path 150 communicating with the orifice and the high pressure inlet, to adjust the opening degree of the orifice in association with the pressure transfer rod. In the expansion valve for: A bleed hole (140) formed in the valve block (110) so that the refrigerant flows at a predetermined flow rate even when the orifice is closed by the ball valve to communicate with the communication path and the expansion discharge part; A connection port 143 is formed to communicate the inside of the bleed hole, and a dispersion ring 145 extending from the inner circumferential surface corresponding to the connection port toward the connection port and dispersing the refrigerant discharged from the connection port is provided on the outer circumferential surface thereof. It further comprises a; formed with a refrigerant dispersing protrusion 144, the bush (142) pressed into the expansion discharge portion; The refrigerant dispersing protrusion 144, the diameter of the expansion valve for the vehicle rear air conditioner, characterized in that the diameter decreases toward the end of the connection port 143 toward the dispersing ring (145). The method of claim 1, The bleed hole 140 has a diameter of 2.0mm or more, and the diameter of the connection port 143 is 0.3 ~ 0.6mm expansion valve for a vehicle rear air conditioner. The method of claim 1, The dispersion ring 145, the expansion valve for the vehicle rear air conditioner, characterized in that the thickness becomes thinner toward the edge. delete

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