KR20170094035A - Expansion valve of air conditioning system for automotive vehicles - Google Patents

Expansion valve of air conditioning system for automotive vehicles Download PDF

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Publication number
KR20170094035A
KR20170094035A KR1020160014921A KR20160014921A KR20170094035A KR 20170094035 A KR20170094035 A KR 20170094035A KR 1020160014921 A KR1020160014921 A KR 1020160014921A KR 20160014921 A KR20160014921 A KR 20160014921A KR 20170094035 A KR20170094035 A KR 20170094035A
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KR
South Korea
Prior art keywords
refrigerant
inner tube
flexible inner
flow path
pressure
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Application number
KR1020160014921A
Other languages
Korean (ko)
Inventor
나민균
박영덕
한규익
홍선주
Original Assignee
한온시스템 주식회사
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Priority to KR1020160014921A priority Critical patent/KR20170094035A/en
Publication of KR20170094035A publication Critical patent/KR20170094035A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3227—Cooling devices using compression characterised by the arrangement or the type of heat exchanger, e.g. condenser, evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F25B41/062—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0241—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes the tubes being flexible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3267—Cooling devices information from a variable is obtained related to the operation of an expansion valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/02—Flexible elements

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Temperature-Responsive Valves (AREA)

Abstract

The present invention relates to an expansion valve of an air conditioner for a vehicle, which can maintain the pressure of the refrigerant downstream of the throttle shaft constant regardless of the flow rate of the refrigerant, Occurrence "of the vehicle interior can be prevented, thereby improving ride comfort and comfort in the interior of the vehicle.
In order to achieve the above object, the present invention provides an expansion valve for a vehicle air conditioner having a throttle channel for expanding a high-pressure refrigerant introduced from a condenser to a low pressure and introducing the refrigerant to an evaporator, And the flexible inner tube is provided on the downstream side of the throttle channel so that the flexible inner tube can be discharged to the inlet pipe side of the throttle body. The flexible inner tube is deformed in accordance with the flow rate of the refrigerant transferred from the throttle channel, The cross-sectional area is variable.

Description

TECHNICAL FIELD [0001] The present invention relates to an expansion valve for an automotive air conditioner,

The present invention relates to an expansion valve of an air conditioner for a vehicle, and more particularly, to an expansion valve for a vehicle air conditioner which can maintain a pressure of a refrigerant downstream of a throttle shaft constant regardless of a flow rate of the refrigerant, The present invention relates to an expansion valve for a vehicle air conditioner capable of preventing the occurrence of " refrigerant leakage sound "

The car has an air conditioner that cools and heats the inside of the car. Such an air conditioner is provided with an expansion valve for expanding the high-pressure refrigerant discharged from the condenser to low temperature and low pressure.

As an example of the expansion valve, there is a warm-up type expansion valve.

As shown in FIG. 1, the pressure-sensitive type expansion valve includes a high-pressure refrigerant passage 5 through which high-pressure refrigerant flowing from the condenser 1 to the evaporator 3 can pass, A low-pressure refrigerant passage 9 through which low-pressure refrigerant flowing into the high-pressure refrigerant passage 5 can pass, a throttling flow passage 10 formed on the high-pressure refrigerant passage 5, and a ball- Type driving device 14 for moving the valve body 12 in accordance with the temperature of the refrigerant passing through the low-pressure refrigerant passage 9 and the low-pressure refrigerant passage 9.

Such a warm-feeling expansion valve causes the valve element 12 to move with respect to the throttle shaft 10 by moving the valve element 12 upward or downward according to the temperature of the refrigerant passing through the low-pressure refrigerant passage 9. Accordingly, the amount of opening of the throttling flow path 10 is adjusted.

As a result, the high-pressure refrigerant passing through the throttling flow path 10 is throttled and expanded to a low pressure. As a result, the expanded low-pressure refrigerant is vaporized while passing through the evaporator 3, so that the evaporated refrigerant can take out the surrounding heat and generate cold air.

However, when the thermal load of the evaporator 3 is small and the amount of opening of the throttle shaft 10 is reduced, the amount of refrigerant passing through the throttle shaft 10 is also relatively reduced. Therefore, there is a disadvantage that the refrigerant pressure on the downstream side of the throttle shaft 10 can not be kept constant.

Particularly, the amount of the refrigerant flowing downstream of the throttling flow path 10 is remarkably reduced because of the decrease in the amount of refrigerant in the throttling flow path 10, and the pressure of the refrigerant downstream of the throttling flow path 10 is remarkably weakened There are disadvantages.

Because of this disadvantage, the upstream refrigerant of the throttle shaft 10 causes a pressure change in the process of passing through the throttle shaft 10, and the "throttle", "chuck" The refrigerant leak sound is repeatedly generated. Such "refrigerant leakage sound" causes a "ride environment" in the interior of the vehicle to deteriorate. As a result, "comfort" The drawback is pointed out.

Further, the conventional warm-up type expansion valve is characterized in that the refrigerant pressure downstream of the throttling flow path 10 is remarkably weakened, so that the flow characteristic of the refrigerant conveyed from the high-pressure refrigerant passage 5 to the inlet pipe 3a of the evaporator 3 Is remarkably lowered.

Particularly, there is a problem that the refrigerant conveyed from the high-pressure refrigerant passage 5 to the inlet pipe 3a of the evaporator 3 flows back to the high-pressure refrigerant passage 5 side of the expansion valve due to the low- There is a drawback that the flow characteristics of the refrigerant deteriorate and the performance of the expansion valve is lowered.

In addition, since the amount of refrigerant downstream of the throttle channel 10 is remarkably reduced in the conventional warm-up type expansion valve, an empty space is generated inside the high-pressure refrigerant passage 5 and the inlet pipe 3a of the evaporator 3 .

The drawback is that the flow of refrigerant at the side of the inlet pipe 3a of the high-pressure refrigerant passage 5 and the evaporator 3 changes irregularly to generate flow noise.

On the other hand, in view of this, a technique of preventing "leakage of refrigerant leakage" in the throttle channel 10 and improving the flow characteristics of the refrigerant has been proposed.

2, a rectifying plate 20 is provided on a downstream side portion of the throttling flow channel 10, and the throttling plate 20 is connected to the throttling flow channel 10 via the rectifying plate 20, Thereby maintaining the pressure of the refrigerant on the downstream side constant.

Therefore, the refrigerant pressure on the downstream side of the throttling flow passage 10 can maintain a sufficient state. Thereby, the flow characteristics of the refrigerant passing through the throttling flow path 10 are improved, and the pressure of the refrigerant is kept constant. As a result, the occurrence of the "refrigerant leakage sound" in the throttle shaft 10 is prevented, thereby improving the "comfort"

However, such a conventional technique is effective in preventing "leakage of refrigerant leakage" in the throttle shaft 10, but when the opening amount of the throttle shaft 10 is increased and the amount of refrigerant passing through the throttle shaft 10 is increased, There is a disadvantage in that a large amount of refrigerant passing through the flow path 10 directly hits the flow regulating plate 20.

This problem leads to a problem that "refrigerant contact noise" is generated in the portion of the commutation plate 20, which causes a "ride environment" of the vehicle interior to deteriorate, The problem is pointed out.

In addition, the conventional technology using the rectifier plate 20 is effective for preventing the "leak of refrigerant leaks" in the throttle channel 10, 5 and the inner hollow space on the side of the inlet pipe 3a can not be solved.

It is pointed out that the irregular refrigerant flow on the side of the high-pressure refrigerant passage 5 and the inlet pipe 3a and the flow noise caused thereby can not be solved because of such disadvantages.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems of the prior art, and it is an object of the present invention to improve the internal structure so that the refrigerant pressure on the downstream side of the throttle channel can be kept constant, And an object thereof is to provide an expansion valve for a vehicle air conditioner capable of preventing generation of pressure fluctuations and thereby a "refrigerant leakage sound"

It is another object of the present invention to provide an expansion valve of a vehicle air conditioner capable of preventing the "refrigerant contact noise" generated due to the rectifier plate by maintaining the pressure of the refrigerant downstream of the throttle shaft constant, .

It is a further object of the present invention to prevent the "refrigerant leakage sound" in the throttling flow channel and the "refrigerant contact noise" due to the rectification plate, thereby more effectively reducing the noise caused by the refrigerant, (EN) An expansion valve of a vehicle air conditioner capable of improving ride comfort and comfort in a car interior.

It is still another object of the present invention to provide a vehicular air conditioning system capable of preventing the "refrigerant backflow phenomenon" from the inlet pipe of the evaporator to the expansion valve side by improving the internal structure, And an expansion valve.

It is still another object of the present invention to provide an expansion valve for a vehicle air conditioner capable of eliminating a high-pressure refrigerant flow path caused by a decrease in the amount of refrigerant and an internal void space on the inlet pipe side by improving the internal structure.

It is another object of the present invention to provide a high pressure refrigerant passage and an inner space on the side of the inlet pipe that can eliminate the high pressure refrigerant passage and the inner space on the side of the inlet pipe to thereby prevent the occurrence of irregular refrigerant flow, And an expansion valve for a vehicle air conditioner that can be prevented at its source.

In order to achieve the above object, an expansion valve for a vehicle air conditioner according to the present invention includes a throttle channel for expanding a high-pressure refrigerant introduced from a condenser to a low pressure and introducing the refrigerant to an evaporator, Further comprising a flexible inner tube installed at a downstream side of the throttle channel so as to introduce a refrigerant transferred from the throttle channel to the inlet pipe of the evaporator, And the cross-sectional area of the inner flow path is varied while being deformed according to the flow rate of the refrigerant transferred from the flow path.

Preferably, the flexible inner tube is configured such that, when the flow rate of refrigerant delivered from the throttle channel is increased, the cross-sectional area of the inner channel increases corresponding to the increased refrigerant flow rate as the refrigerant is deformed outward in the radial direction, The cross sectional area of the inner flow path is reduced corresponding to the reduced refrigerant flow amount while being radially inwardly deformed so that the amount of refrigerant flowing downstream in the throttling flow path and the refrigerant pressure And to prevent the generation of an empty space on the flow path.

And the flexible inner tube is installed toward the inlet pipe of the evaporator from the high-pressure refrigerant passage on the downstream side of the throttle channel.

The flexible inner tube is a fixed end whose one end is fixed to the high-pressure refrigerant passage, and the other end is a free end extending into the inlet pipe of the evaporator.

In the flexible inner tube, when the refrigerant at the inlet pipe side of the evaporator flows back toward the high-pressure refrigerant passage of the expansion valve, the other end of the free end is deformed radially inward due to the reverse flow pressure of the refrigerant, .

According to the expansion valve of the automotive air conditioner of the present invention, since the flexible inner tube is provided on the downstream side of the throttle channel, and the sectional area of the refrigerant passage on the downstream side of the throttle channel is varied according to the flow rate of the refrigerant, The refrigerant pressure downstream of the throttling flow channel can be maintained constant regardless of the flow rate of the refrigerant.

Further, since the refrigerant pressure on the downstream side of the throttling flow path can be kept constant regardless of the flow rate of the refrigerant, there is an effect that the refrigerant pressure fluctuation and thus the "refrigerant leakage sound generation" .

Further, since the cross-sectional area of the refrigerant channel on the downstream side of the throttle channel is changed through the flexible inner tube, and the refrigerant pressure on the downstream side of the throttle channel can be maintained constant regardless of the flow rate of the refrigerant, The refrigerant pressure on the downstream side of the flow path can be maintained constant.

Further, since the refrigerant pressure on the downstream side of the throttle shaft passage can be kept constant without the rectifying plate, the "refrigerant contact noise" caused by the rectifying plate can be prevented.

In addition, since the "refrigerant leakage sound" in the throttling flow channel and the "refrigerant contact noise" due to the rectifying plate can be prevented, the noise caused by the refrigerant can be more effectively reduced and the ride comfort and comfort There is an effect that can be improved.

Further, the cross-sectional area of the downstream side refrigerant channel of the throttle channel is varied through the flexible inner tube, whereby a void space generated on the high-pressure refrigerant channel and the internal flow path on the inlet pipe side can be eliminated when the flow rate of the refrigerant is reduced Therefore, it is possible to prevent the occurrence of the irregular refrigerant flow and the flow noise due to the empty space in the internal flow path.

Further, since the refrigerant flowing backward from the evaporator side to the expansion valve side is blocked through the flexible inner tube, the flow characteristics of the refrigerant can be improved, thereby improving the performance of the expansion valve.

1 is a sectional view showing an expansion valve of a conventional automotive air conditioner,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion valve,
3 is a sectional view showing an expansion valve of a vehicle air conditioning system according to the present invention,
Fig. 4 is a perspective view showing a flexible inner tube constituting the present invention, Fig.
Fig. 5 is an operational view showing an operation example of the present invention, and is a diagram showing an example of operation of the flexible inner tube when the refrigerant flow rate on the throttle channel side is increased,
Fig. 6 is an operational view showing an operation example of the present invention. Fig. 6 is a view showing an example of operation of the flexible inner tube when the refrigerant flow rate on the throttle channel side is reduced,
7 is an operational view showing an operation example of the present invention, and shows an example of operation of the flexible inner tube when the refrigerant on the evaporator side flows back toward the expansion valve side,
8 and 9 are views showing a modified example of the flexible inner tube constituting the present invention,
10 is a perspective view showing another modified example of the flexible inner tube constituting the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an expansion valve for a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings (the same components as those in the prior art are denoted by the same reference numerals).

First, the expansion valve of the air conditioner will be briefly described with reference to FIG. 3, before explaining the characteristic portion of the expansion valve for an air conditioner according to the present invention.

The expansion valve of the air conditioning system includes a high-pressure refrigerant passage 5 through which the high-pressure refrigerant flowing from the condenser 1 to the evaporator 3 can pass, and a low-pressure refrigerant flowing from the evaporator 3 to the compressor 7 Pressure refrigerant passage 9 and a throttle passage 10 formed on the high-pressure refrigerant passage 5. The low-pressure refrigerant passage 9 and the throttle passage 10 are formed in the high-

The expansion valve of the air conditioning system includes a ball type valve body 12 for opening and closing the throttle channel 10 and a valve body 12 for moving the valve body 12 in accordance with the temperature of the refrigerant passing through the low- Type driving device 14 for driving the vehicle.

This expansion valve adjusts the amount of opening of the throttling flow path 10 by moving the valve element 12 up and down in accordance with the temperature of the refrigerant passing through the low pressure refrigerant passage 9.

Accordingly, the high-pressure refrigerant passing through the throttling flow path 10 is contracted and expanded to a low pressure. As a result, the expanded low-pressure refrigerant is vaporized while passing through the evaporator 3, so that the evaporated refrigerant can generate cold air while depriving the surrounding heat.

Next, the characteristics of the expansion valve of the air conditioner for a vehicle according to the present invention will be described in detail with reference to FIG. 3 to FIG.

3 and 4, the expansion valve of the present invention includes a flexible inner tube 30 provided on the high-pressure refrigerant passage 5 on the downstream side of the throttle passage 10 .

The flexible inner tube 30 is made of a material capable of bending deformation and bending deformation such as a vinyl material and is installed from the high-pressure refrigerant passage 5 toward the inlet pipe 3a of the evaporator 3 do.

Particularly, the flexible inner tube 30 is a fixed end whose one end 32 is fixed to the inner circumferential surface portion of the high-pressure refrigerant passage 5 and the other end 34 is extended toward the inside of the inlet pipe 3a of the evaporator 3 It is an extended free end.

The flexible inner tube 30 introduces all of the refrigerant that has passed through the throttling flow path 10 and guides the introduced refrigerant to the inlet pipe 3a side of the evaporator 3 while transferring the introduced refrigerant along the internal flow path 36.

On the other hand, such a flexible inner tube 30 is capable of bending deformation and bending deformation, so that the sectional area of the inner flow path 36 is variable. In particular, the sectional area of the internal flow path 36 varies depending on the flow rate of the refrigerant flowing from the throttle shaft 10 side.

For example, when the heat load of the evaporator 3 is large and the flow rate of the refrigerant conveyed from the throttle shaft 10 side is increased, the flexible inner tube 30 is deformed radially outward as shown in Fig. 5 And thus corresponds to the increased refrigerant flow rate.

Conversely, when the thermal load of the evaporator 3 is small and the flow rate of the refrigerant transferred from the throttle shaft 10 side is reduced, the flexible inner tube 30 is deformed radially inward as shown in Fig. 6, Which corresponds to the refrigerant flow rate.

In this flexible inner tube 30 having such a structure, the cross-sectional area of the internal flow path 36 is varied according to the flow rate of the refrigerant, so that the flow rate of the refrigerant passed through the throttling flow path 10 is kept constant.

Particularly, when the heat load of the evaporator 3 is small and the flow rate of refrigerant transferred from the throttle shaft 10 side is reduced, the sectional area of the internal flow path 36 is reduced corresponding to the decrease in the flow rate of the refrigerant, The flow rate of the refrigerant passing through the throttling flow path 10 is kept constant.

This makes it possible to keep the refrigerant pressure on the downstream side of the throttling flow path 10 constant. Therefore, the pressure fluctuation of the refrigerant passing through the throttling flow path 10 is positively prevented. As a result, the occurrence of "refrigerant leakage sound" in the throttling flow path 10 due to the pressure fluctuation of the refrigerant is fundamentally prevented.

The flexible inner tube 30 has a structure in which the sectional area of the inner flow path 36 is correspondingly reduced when the refrigerant flow rate on the throttle shaft 10 side is reduced. Therefore, even if the refrigerant flow amount on the throttle shaft 10 side is reduced , So that no voids are generated in the high-pressure refrigerant flow path (5) and the internal flow path on the side of the inlet pipe (3a).

Therefore, irregular refrigerant flow generated due to the empty space in the internal flow path and the flow noise caused thereby can be prevented originally.

7, when the refrigerant conveyed to the inlet pipe 3a of the evaporator 3 flows back toward the high-pressure refrigerant passage 5 side of the expansion valve, the flexible inner tube 30, The free end 34 is folded while deforming radially inward due to the back flow pressure of the refrigerant.

Therefore, the "refrigerant backflow phenomenon" to the expansion valve side is prevented from the source. This improves the flow characteristics of the refrigerant, thereby improving the performance of the expansion valve.

It is preferable that the fixed end of the one end 32 is fixed to the inlet side of the inlet pipe 3a of the evaporator 3 in the flexible inner tube 30 having such a structure. In particular, it is preferable to be fixed to surround the inlet of the inlet pipe 3a.

The flexible inner tube 30 is extended from the high-pressure refrigerant passage 5 of the expansion valve to the inside of the inlet pipe 3a of the evaporator 3, but has a sufficient length.

Preferably, the flexible inner tube 30 has a length of 50 mm or more. Therefore, it is preferable that the refrigerant flows from the high-pressure refrigerant passage 5 of the expansion valve toward the inside of the inlet pipe 3a of the evaporator 3 by 50 mm or more.

In the drawings of the present invention, the flexible inner tube 30 is described as being formed of a single layer. However, in some cases, a plurality of vinyl tubes may be stacked on each other, It can be folded into several layers.

Next, Figs. 8 and 9 show a modification of the flexible inner tube 30. Fig.

The flexible inner tube 30 of the modified example has the same structure and shape as those of the above-described embodiment.

However, unlike the above-described embodiment made of vinyl, it is made of a material which can be stretched and deformed, for example, rubber.

The flexible inner tube 30 made of rubber can be contracted and deformed radially inwardly and outwardly.

Therefore, as shown in FIG. 8, when the heat load of the evaporator 3 is small and the flow rate of the refrigerant delivered from the throttle shaft 10 side is reduced, the refrigerant shrinks radially inward and corresponds to the reduced refrigerant flow rate.

Conversely, when the heat load of the evaporator 3 is large and the flow rate of the refrigerant conveyed from the side of the throttle shaft 10 is increased, as shown in Fig. 9, it corresponds to the refrigerant flow rate increased while being relaxed radially outward.

Since the flexible inner tube 30 having such a configuration is made of a rubber material, the cross-sectional area of the inner flow path 36 changes very rapidly depending on the flow rate of the refrigerant. Therefore, it is possible to quickly cope with a small flow rate fluctuation of the refrigerant.

Thereby, when the refrigerant flow rate fluctuates on the throttle shaft flow path 10 side, the "refrigerant pressure change" on the downstream side of the throttle shaft flow passage 10 is actively prevented while responding quickly.

As a result, it is possible to effectively prevent the "refrigerant pressure fluctuation" and the resulting "refrigerant leakage sound" in the throttling flow path 10 due to "refrigerant pressure change" on the downstream side of the throttling flow path 10.

Next, another modified example of the flexible inner tube 30 is shown in Fig.

The flexible inner tube 30 of another modified example further includes a hard core member 38 provided along the longitudinal direction.

The hard core material 38 is made of a material which is not deformed by flexure, for example, hard plastic. The core material 38 thus configured serves to prevent the flexible inner tube 30 from being deformed in the longitudinal direction.

Therefore, the flexible inner tube 30 is prevented from being excessively deformed while being folded in the longitudinal direction at the inlet pipe 3a of the evaporator 3. [

This prevents the high-pressure refrigerant passage (5) of the expansion valve and the inlet pipe (3a) of the evaporator (3) from being clogged due to the longitudinal deformation.

Here, it is preferable that the hard core member 38 is installed in the flexible inner tube 30 by a double injection method when the flexible inner tube 30 is manufactured.

According to the present invention having such a configuration, the flexible inner tube 30 is provided on the downstream side of the throttle shaft 10, and the sectional area of the refrigerant passage on the downstream side of the throttle shaft 10 is varied depending on the flow rate of the refrigerant, The refrigerant pressure downstream of the throttling flow channel 10 can be kept constant regardless of the flow rate of the refrigerant.

Further, since the refrigerant pressure downstream of the throttling flow path 10 can be kept constant regardless of the flow rate of the refrigerant, the refrigerant pressure fluctuation and thus the "refrigerant leakage sound generation" can do.

In addition, the sectional area of the downstream refrigerant channel of the throttle shaft 10 is varied through the flexible inner tube 30 to maintain the pressure of the refrigerant downstream of the throttling channel 10 constant, regardless of the flow rate of the refrigerant The refrigerant pressure downstream of the throttling flow channel 10 can be maintained constant without the rectifying plate 20 (see FIG. 2).

Further, since the refrigerant pressure downstream of the throttling flow path 10 can be kept constant without the rectifying plate 20, the "refrigerant contact noise" generated by the rectifying plate 20 can be prevented.

In addition, since the "refrigerant leakage sound" in the throttle shaft flow path 10 and the "refrigerant contact noise" due to the rectifying plate 20 can be prevented, noise caused by the refrigerant can be reduced more effectively, Ride comfort and comfort can be improved.

The cross sectional area of the refrigerant flow path downstream of the throttle shaft 10 is varied through the flexible inner tube 30 so that the refrigerant flows through the high-pressure refrigerant passage 5 and the inside of the inlet pipe 3a It is possible to prevent the occurrence of the irregular refrigerant flow caused by the empty space in the internal flow path and the flow noise due to the empty space generated in the internal flow path.

Further, since the refrigerant flowing backward from the evaporator 3 side to the expansion valve side is blocked through the flexible inner tube 30, the flow characteristics of the refrigerant can be improved, thereby improving the performance of the expansion valve have.

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 embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

1: condenser 3: evaporator
3a: inlet pipe 5: high-pressure refrigerant passage
7: compressor 9: low-pressure refrigerant passage
10: throttle channel 12: valve body
14:
30: Flexible Inner Tube
32: Once 34:
36: inner flow path 38: core material

Claims (11)

And a throttle channel (10) for expanding the high-pressure refrigerant introduced from the condenser (1) to a low pressure and introducing the refrigerant to the evaporator (3), characterized in that the expansion valve
A flexible inner tube provided on the downstream side of the throttle shaft 10 so as to introduce the refrigerant transferred from the throttle shaft 10 to the inlet pipe 3a of the evaporator 3, (30), < / RTI >
Wherein the flexible inner tube (30) is deformed in accordance with a flow rate of the refrigerant conveyed from the throttling flow path (10), and the sectional area of the internal flow path (36) is variable. The method according to claim 1,
The flexible inner tube (30)
As the flow rate of the refrigerant transferred from the throttling flow path 10 increases, the cross-sectional area of the internal flow path 36 increases corresponding to the increased refrigerant flow amount while being deformed radially outward,
When the flow rate of the refrigerant transferred from the throttling flow path 10 is reduced, the sectional area of the internal flow path 36 is reduced corresponding to the reduced refrigerant flow amount while being deformed radially inward,
Wherein the amount of refrigerant flowing downstream of the throttling flow path (10) and the refrigerant pressure are controlled to be constant and the generation of a free space on the flow path is prevented regardless of the flow rate of the refrigerant transferred from the throttling flow path (10) Expansion valve of air conditioning system. 3. The method of claim 2,
The flexible inner tube (30)
Is installed toward the inlet pipe (3a) of the evaporator (3) from the high-pressure refrigerant passage (5) on the downstream side of the throttling flow passage (10). The method of claim 3,
The flexible inner tube (30)
Wherein one end (32) is a fixed end fixed to the high-pressure refrigerant passage (5) and the other end (34) is a free end extending into the inlet pipe (3a) of the evaporator (3) Expansion valve. 5. The method of claim 4,
The flexible inner tube (30)
When the refrigerant at the inlet pipe 3a side of the evaporator 3 flows back toward the high-pressure refrigerant passage 5 of the expansion valve, the other end 34 of the free end is deformed radially inward due to the back- So that the refrigerant is prevented from flowing backward. 6. The method of claim 5,
The flexible inner tube (30)
And the fixed end of the one end (32) is fixed to the inlet side of the inlet pipe (3a) of the evaporator (3). The method according to claim 6,
The flexible inner tube (30) further includes a hard core (38) provided along the longitudinal direction;
Wherein the hard core member (38) prevents the longitudinal elastic deformation of the flexible inner tube (30). The method according to claim 1,
The flexible inner tube (30)
Wherein a plurality of tubes are stacked in layers to form a plurality of layers. The method according to claim 1,
The flexible inner tube (30)
Wherein a plurality of sheets are formed by rolling one sheet in the form of a tube. 10. The method according to any one of claims 1 to 9,
The flexible inner tube (30)
Wherein the expansion valve is made of a vinyl material capable of bending deformation. 10. The method according to any one of claims 1 to 9,
The flexible inner tube (30)
Wherein the elastic member is made of a rubber material capable of bending deformation and stretching deformation.
KR1020160014921A 2016-02-05 2016-02-05 Expansion valve of air conditioning system for automotive vehicles KR20170094035A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109425152A (en) * 2017-08-31 2019-03-05 杭州三花研究院有限公司 Plate heat exchanger integrated package

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109425152A (en) * 2017-08-31 2019-03-05 杭州三花研究院有限公司 Plate heat exchanger integrated package

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