KR20140027765A - Expansion valve in vehicle's air conditioner - Google Patents

Abstract

According to the present invention, provided is an expansion valve which comprises: a rectangular parallelepiped-shaped valve main body; a rectifying plate arranged inside the first port of the valve main body, having a rectifying hole formed therethrough and through which a refrigerant passes, and having a rib which protrudes therefrom and is circumferentially fastened and inserted into the first port; a refrigerant flow path making the refrigerant flow between the first port and the second port of the valve main body; and a driving part arranged at the top of the valve main body and controlling the opening degree of the refrigerant flow path according to the temperature of the refrigerant flowing inside the valve main body, wherein the valve main body includes: a first side to which a pipe flange for an evaporator is connected; a third side to which a pipe flange for an air conditioner is connected; a second side arranged between the first side and the third side; a fourth side facing the first side; a fifth side facing the third side; the first port and a fourth port which are formed at the first side up and down; and the second port and a third port which are formed at the third side up and down. According to the present invention, a rectifying plate arranged on a refrigerant flow path inside a valve main body makes the part of the refrigerant flow path function as a muffler so that the generation of noise in the refrigerant flow path can be reduced; and also a cover arranged on an actuation rod actuated up and down inside valve main body prevents the minute vibration of the actuation rod so that noise can be reduced.

Description

Expansion valve for vehicle air conditioner

The present invention relates to an expansion valve for a vehicle air conditioner, and more particularly, to the refrigerant flow noise inside the inside of the expansion valve disposed inside the expansion valve, and to suppress the vibration by the operating rod An expansion valve for a vehicle air conditioner capable of precisely adjusting the opening degree of a valve.

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.

The vehicle air conditioner includes a cooling device for cooling the interior of a vehicle. At this time, the cooling device is configured to cool the interior of the vehicle by heat exchange between the evaporator and the indoor and outdoor air in the process of circulating the refrigerant discharged by the driving of the compressor back to the compressor through the condenser, the receiver dryer, the expansion valve and the evaporator.

Here, the expansion valve is installed between the condenser and the evaporator and expands the condensed refrigerant to rapidly evaporate the refrigerant in the evaporator, and serves to supply the expanded refrigerant to be evaporated while maintaining an appropriate superheat in the evaporator. do.

Herein, the expansion valve according to the prior art will be described using, for example, Korean Patent Laid-Open Publication No. 2004-76192 'A method for forming a flow path of an expansion valve and an expansion valve.'

1 is a partial cutaway perspective view showing an example of the internal configuration of the expansion valve according to the prior art.

Referring to FIG. 1, a third port 14 and a fourth port 15 are formed to intersect inside a valve body 11 having a rectangular parallelepiped shape, and operate with an expansion and contraction action according to a temperature change of a refrigerant. A unit valve for controlling the opening degree of the refrigerant passage flowing through the first port 12 and the second port 13 in conjunction with the drive unit 20 and the operating rod 25 to reciprocate in the axial direction 25 (30).

The driving unit 20 includes a temperature sensing chamber 21 filled with a fluid that expands and contracts according to a temperature change of the refrigerant discharged from the evaporator outlet through the fourth port 15, and the temperature sensing chamber 21 is provided. It is composed of a diaphragm 22 provided in the interior and displaced in the vertical direction in accordance with the expansion and contraction of the fluid and the plate 23 connected to be located at the center side of the diaphragm 22.

The unit valve 30 is disposed at the lower end of the operating rod 25 on the first port 12 to apply an elastic force so that the operating rod 25 can always be in close contact with the plate 23 of the temperature reduction chamber 21. It includes a spring 31, the operation ball 32 provided between the end of the operating rod 25 and the spring 31 to adjust the opening and closing of the first port (12).

The conventional expansion valve configured as described above has a problem that noise is generated while the refrigerant flowing into the expansion valve flows through the first port and the second port in the refrigerating cycle.

In addition, there is a problem that the vibration is finely generated in the process of moving the operating rod 25 up and down.

The present invention has been made to solve the above problems, by placing a rectifying plate on the refrigerant passage inside the valve body, a portion of the refrigerant passage serves as a muffler to reduce the noise generated by the refrigerant flow on the refrigerant flow path An object of the present invention is to provide an expansion valve for a vehicle air conditioner.

In addition, an object of the present invention is to provide an expansion valve for a vehicle air conditioner, by disposing a cover on the operating rod operating up and down inside the valve body to prevent fine vibration of the operating rod to reduce noise.

In order to achieve the above object, the present invention, the first side is connected to the pipe flange for the evaporator, the third side is connected to the air conditioning pipe flange, the second side disposed between the first side and the third side, A fourth side facing the first side, a fifth side facing the third side, first and fourth ports vertically formed on the first side, and second and a bottom side formed on the third side; An expansion valve including a rectangular parallelepiped valve body having a third port, wherein the expansion valve is disposed inward of the first port, and has a rectifying hole through which a refrigerant passes, and is press-fitted into the first port along an outer circumference thereof. Rectifying plate protruding rib; A refrigerant flow path configured to allow refrigerant flow between the first port and the second port; And a driving unit disposed at an upper end of the valve body and controlling an opening degree on the refrigerant passage according to a temperature of the refrigerant flowing in the valve body. It provides an expansion valve for a vehicle air conditioner comprising a.

The lower end of the diameter of the rectifying hole may coincide with the lower end of the inner port of the first port.

The diameter of the rectifying hole may be 0.3 to 0.6 of the diameter of the rectifying plate.

The rectifying plate may be manufactured by press working.

The driving unit includes a ball disposed on the coolant flow path to control opening and closing of the coolant flow path, a ball seat for stably supporting the ball at the bottom of the ball, and an elastic force with respect to the ball at the bottom of the ball seat. A temperature reducing chamber which provides a spring to be applied, a working gas which contracts and expands in accordance with the temperature of the refrigerant inwardly, and is mounted below the temperature reducing chamber and deformed in the vertical direction by the contracting and expanding of the working gas The diaphragm is in close contact with the diaphragm, and the displacement is in the form of a plate and a rod in accordance with the deformation of the diaphragm. An actuating rod that is operative and a through hole through which the actuating rod is inserted into a cylindrical shape in a cylindrical shape, wherein the third port and the It may include an operating rod cover disposed on the cross path of the fourth port.

The operating rod cover may have a shape that can adjust the opening degree of the refrigerant passage.

The actuating rod cover may comprise plastic.

The present invention as described above, by arranging the rectifying plate on the refrigerant passage inside the valve body so that a portion of the refrigerant passage serves as a muffler to reduce the generation of noise on the refrigerant passage.

In addition, by placing a cover on the operating rod operating up and down inside the valve body to prevent the micro-vibration of the operating rod to reduce the noise.

1 is a partial cutaway perspective view showing an example of the internal configuration of the expansion valve according to the prior art.
2 is a perspective view showing an expansion valve and a connection state thereof according to the present invention.
3 is a sectional view taken along the line AA of FIG. 2.
Figure 4 is a partial cutaway perspective view showing the internal configuration of the expansion valve according to the present invention.
Figure 5 is a perspective view showing an example of the configuration of the operating rod cover used in the present invention
6 is a perspective view showing an example of the configuration of a rectifying plate used in the present invention.
7 is a cross-sectional view illustrating an example of a rectifying plate arrangement state on a first port.
FIG. 8 is a detailed view of the AA portion of FIG. 7. FIG.
9 is a graph showing the noise reduction effect according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view showing an expansion valve and a connection state thereof according to the present invention.

First, let's talk about expansion valve and cooling system.

The expansion valve throttles the refrigerant flowing from the condenser and supplies it to the evaporator, and the opening degree is controlled by the refrigerant flowing from the evaporator to the compressor and performs the function of throttling and opening control in the vehicle air conditioner.

Referring to the operation of the cooling device equipped with an expansion valve, the refrigerant introduced into the compressor is compressed to a high temperature and high pressure state in the compressor, and then condensed in the condenser. The condensed refrigerant is throttled in the expansion valve and then evaporates in the evaporator. The vaporized gas enters the expansion valve, is used to control the opening of the expansion valve, and then flows back into the compressor. Although all the refrigerant flowing out of the evaporator is configured to flow into the expansion valve, some refrigerant may be bypassed from the evaporator and flow into the expansion valve.

2, the expansion valve 100 for a vehicle air conditioner according to the present invention is the valve body 110, the first flange 121, the second flange 131, the condenser outlet pipe 132, compressor inlet Pipe 134, the evaporator inlet pipe 123, and the evaporator outlet pipe 124.

The valve body 110 is manufactured in the form of a rectangular parallelepiped. The valve body 110 may be manufactured by cutting a metal material such as aluminum into a rectangular parallelepiped shape. At this time, the horizontal, vertical, height of the valve body 110 may be set in various ways according to the needs of the user.

The driving unit 170 is disposed at the upper end of the valve body 110. The configuration of the driving unit 170 will be described later.

The valve body 110 includes first to fifth side surfaces 120, 130, 140, 150, 160 formed along the perimeter.

The first side surface 120 and the fourth side surface 150 are in a planar shape and are formed by extrusion or cutting in the manufacture of the valve body 110. First and fourth ports 112 and 115 are formed on the first side surface 120 so that the evaporator inlet pipe 123 and the evaporator outlet pipe 124 may be inserted, respectively. In this case, the first port 112 is formed at a position lower than the fourth port 115. The first and fourth ports 112 and 115 may be formed by drilling.

At this time, the first flange 121 is used to facilitate the insertion state of the evaporator inlet pipe 123 and the evaporator outlet pipe 124. The first flange 121 has a rectangular parallelepiped shape at both ends, and a pair of holes are formed in parallel to allow the evaporator inlet pipe 123 and the evaporator outlet pipe 124 to pass therethrough.

The first flange 121 may be bolted to the first side surface 120 of the valve body 110.

The third side surface 130 and the fifth side surface 160 have a planar shape, and are formed by extrusion or cutting at the time of manufacturing the valve body 110. The second port and the third port 113 and 114 are formed on the third side surface 130 so that the condenser outlet pipe 132 and the compressor inlet pipe 134 may be inserted. In this case, the second port 113 is formed at a position lower than the third port 114. The second port and the third port 113, 114 may be formed by drilling.

In this case, the second flange 131 is used to facilitate the insertion state of the condenser outlet pipe 132 and the compressor inlet pipe 134. The second flange 131 is a rectangular parallelepiped in which both ends are rounded, and a pair of holes are formed in parallel to allow the condenser outlet pipe 132 and the compressor inlet pipe 134 to pass therethrough.

The second flange 131 may be bolted to the third side surface 130 of the valve body 110.

The second side surface 140 is in a planar shape and an edge between the first side surface 120 and the third side surface 130 included in the rectangular parallelepiped valve body 110, that is, the first side surface 120 and the third side surface. 130 is formed by extrusion or cutting on the corner portions that abut each other. Here, the degree of extrusion or cutting is formed as large as possible the width of the second side surface 140 in a range that does not expose the flow path inside the valve body 110, and does not affect the durability of the valve body 110. It is preferable that it is about degree. In addition, the side edge portion of the first flange 121 and the side edge portion of the second flange 131 preferably has a size not exceeding the width of the second side surface (140).

Meanwhile, extrusion or cutting may also be performed on the upper and lower edges of the valve body 110.

Since the valve body 110 is in the form of a hexahedron, the upper and lower portions of the valve body 110 each include four corners. At this time, an extrusion process or a cutting process is performed on one side edge of the upper edge of the valve body 110 to form the first cutting part 116, and two edges parallel to each other among the lower edges of the valve body 110. Extrusion or cutting is performed with respect to the second cutting portion 117. At this time, the upper edge and the lower edge of the valve body 110 is preferably parallel to each other.

The widths of the first cutting portion 116 and the second cutting portion 117 are set as large as possible within a range that does not expose the flow path inside the valve body 110 and does not affect the durability of the valve body 110. desirable.

The overall weight reduction of the valve body 110 may be achieved by forming the first cutting portion 116 and the second cutting portion 117.

Here, although the second side surface 140 is formed in a planar shape, the first cutting portion 116 and the second cutting portion 117 may be formed in a predetermined curved shape. In addition, the second side surface 140, the first cutting unit 116, and the second cutting unit 117 may be formed in various forms according to a user's needs. In addition, the number of formation of the first cutting unit 116 and the second cutting unit 117 may be changed according to the needs of the user.

The second flange 131 may be connected to the fifth side surface 160 of the valve body 110 according to the mounting position of the air conditioner, and the second side surface 140 may include the first side surface 120 and the fifth side surface. It may be formed by an extrusion process or a cutting process for the corners between the edges 160, that is, the portion where the first side surface 120 and the fifth side surface 160 abut each other.

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2 and shows a correlation between the fourth port 115 into which the evaporator outlet pipe 124 is inserted and the third port 114 into which the compressor inlet pipe 134 is inserted.

Referring to FIG. 3, it can be seen that the third port 114 and the fourth port 115 are formed to cross each other. According to the drawing, the third port 114 and the fourth port 115 are orthogonal to each other, but the crossing angle may be changed according to the needs of the user.

Here, the innermost end of the fourth port 115 forms a predetermined groove shape 119 by the blade tip angle of the drill used in the drilling operation. This portion allows the refrigerant discharged from the fourth port 115 to collide first, and then stably flows out through the third port 114. Therefore, the noise due to the refrigerant flow can be reduced.

In order to prevent the groove shape 119 from being formed on the inner wall of the fourth port 115, the fourth port 115 is preferably formed after the forming operation of the third port 114. In addition, when the third port 114 is formed, it is preferable that the innermost end of the third port 114 is covered by the fourth port 115.

Reference numeral 118, not described in FIG. 3, is a stud bolt used to secure the cover to the valve body.

Figure 4 is a partial cutaway perspective view showing the internal configuration of the expansion valve according to the present invention.

Referring to FIG. 4, the driving unit 170 is disposed above the valve body 110.

The driving unit 170 has a temperature reduction chamber 175 so that the fluid is filled inside by the refrigerant flowing from the outside, and the diaphragm displaced in the vertical direction in accordance with the expansion and contraction of the fluid by the refrigerant flowing from the outside ( The ball 172 disposed therein is operated by the operating rod 180 reciprocating in the axial direction according to the displacement amount of the 176 and the plate 177, and the opening degree of the coolant flow path 171 is adjusted.

The driving unit 170 includes a ball 172, a thermo sensor 175, a diaphragm 176, a plate 177, a cover 178, a working rod 180, and a working rod cover 182. The components included in the driver 170 will be described in detail.

The ball 172 is disposed on the coolant flow path 171 communicating the first port 112 and the second port 113 to control the opening degree of the coolant flow path 171. The ball 172 is preferably made of a ball (ball) having a predetermined diameter. A ball seat 173 for stably supporting the ball 172 is disposed below the ball 172, and a spring 174 for applying an elastic force to the ball 172 is stable below the ball seat 173. It has a structure that is mounted as. Movement of the ball 172 is made by the operating rod 180 to be described later.

The temperature reduction chamber 175 is formed in a predetermined size and shape, and is disposed above the valve body 110. The temperature sensing room 175 may be variously formed according to a user's needs.

The interior of the temperature reduction chamber 175 provides a space in which a predetermined gas is stored. The temperature reduction chamber 175 receives the temperature of the refrigerant flowing into the first port 112. Here, the temperature transfer may be made by the plate 177 and the operating rod 180. The operating rod 180 may transmit the introduced refrigerant temperature to the upper plate 177.

The gas stored in the temperature reduction chamber 175 preferably has the same or similar properties as the refrigerant. The gas expands or contracts according to the refrigerant temperature delivered to the temperature reduction chamber 175. In particular, if the refrigerant temperature flowing into the fourth port 115 is overheated, it rapidly expands, and if the refrigerant temperature is excessively reduced, it rapidly contracts.

The diaphragm 176 deforms downward when the gas is expanded, and deforms upward when the gas is contracted. The plate 177 in close contact with the diaphragm 176 is displaced in the vertical direction together with the expansion and contraction of the diaphragm 176 to reciprocate in the axial direction the operating rod 180 which is in close contact with the lower end of the plate 177. Exercise

The operating rod 180 is in the form of a rod having a predetermined length and diameter, one end is in contact with the lower surface of the plate 177, the other end is in contact with the upper end of the ball 172. The operating rod 180 is preferably disposed on the central axis of the valve body (110).

Accordingly, the operating rod 180 moves the ball 172 by the plate 177 that axially moves up and down simultaneously with the up and down deformation of the diaphragm 176. That is, when the gas inside the thermostat chamber 175 expands, the plate 177 moving together according to the lower deformation of the diaphragm 176 causes the operating rod 180 to move downward, thereby being closed by the ball 172. The refrigerant passage 171 is opened to supply the refrigerant.

In addition, when the gas inside the temperature reduction chamber 175 contracts, the ball 172 returns to its original position according to the upper deformation of the diaphragm 176 and the operating rod 180 moves upward to close the refrigerant passage 171. Be sure to At this time, the spring 174 facilitates the return of the ball 172.

The operating rod cover 182 is disposed on the operating rod 180. 5 is a perspective view showing an example of the configuration of the operating rod cover used in the present invention, referring to Figure 5 operating rod cover 182 is a cylindrical shape having a predetermined length and diameter, the operating rod (on the central axis ( The through hole 183 is formed to pass through the 180. The inner circumferential surface of the through hole 183 may be in close contact with the outer circumferential surface of the operating rod 180, thereby preventing the operating rod 180 from vibrating when the operating rod 180 moves up and down.

The actuating rod cover 182 is preferably fixed on the intersection of the third port 114 and the fourth port 115.

The operating rod cover 182 controls the heat conduction transferred to the plate 177 through the operating rod 180 because the operating rod cover 182 prevents the refrigerant flowing into the fourth port 115 from directly contacting the operating rod 180. Due to the operating rod cover 182, the refrigerant flow path 191 is narrower than that of the conventional refrigerant so that the thermal conductivity of the refrigerant delivered to the plate 177 is controlled. Therefore, the gas inside the temperature reduction chamber 175 expands and contracts too rapidly according to the refrigerant temperature flowing into the fourth port 115 to lower the operation sensitivity of the operating rod 180 to operate the operating rod 180. By preventing the micro-vibration of the operating rod 180 caused by the noise can be reduced due to friction with the ball 172. Here, it can be seen that the noise improvement effect is represented by the blue line of FIG. 9 to be described later.

On the other hand, the rectifying plate 200 is disposed inside the first port 112.

6 is a perspective view showing an example of the configuration of the rectifying plate used in the present invention. Referring to FIG. 6, the rectifying plate 200 is in the form of a circular plate having a predetermined diameter, and is located inside the first port 112. It is arranged at a predetermined position. The rectifying plate 200 allows the flow of the refrigerant through the inner port 111 of the first port 112 to be temporarily stopped to obtain the effect of the chamber disposed on the first port 112. A rectifying hole 202 having a predetermined diameter is formed through the rectifying plate 200 to allow the refrigerant to flow through the first port 112.

The diameter of the rectifying hole 202 is preferably 0.3 to 0.6 of the diameter of the rectifying plate 200.

In this case, in order to further improve the effect of the chamber arrangement, the lower end of the diameter of the rectifying hole 202 is made to match the lower end of the inner port 111 of the first port 112.

FIG. 7 is a cross-sectional view illustrating an example of an arrangement state of the rectifying plate 200 on the first port 112, and FIG. 8 is a detailed view of the AA portion of FIG. 7 and illustrates a rectifying hole 202 on the first port 112. When the rectifier plate 200 is formed, the rib 201 of the rectifier plate 200 allows the rectifier plate 200 to be press-fitted into the first port 112. By the partitioning role of the rectifying plate 200, a predetermined position (for example, part A of FIG. 7) on the first port 112 serves as a chamber of the silencer to reduce noise. Here, it can be seen that the noise improvement effect is represented by the pink line of FIG. 9 to be described later.

9 is a graph showing the noise reduction effect according to the present invention, showing that the noise level (a) of the expansion valve according to the present invention is lower than the noise level (b) of the expansion valve according to the prior art.

According to the present invention configured as described above, by arranging a rectifying plate on the refrigerant passage inside the valve body, a portion of the refrigerant passage serves as a muffler to reduce noise generation on the refrigerant passage, and up and down inside the valve body. The cover is disposed on the operating rod to prevent the micro-vibration of the operating rod to reduce the noise.

While the present invention has been described with reference to exemplary embodiments, 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 appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: expansion valve 110: valve body
111: inner port 112: first port
113: second port 114: third port
115: fourth port 119: groove shape
120: first side 130: third side
140: second side 150: fourth side
160: fifth side 170: driving part
171, 191: refrigerant flow path 172: ball
173: ball seat 174: spring
175: thermal chamber 176: diaphragm
177: plate 180: operating rod
182: operating rod cover 200: rectifying plate

Claims (7)

A first side surface to which an evaporator pipe flange is connected, a third side surface to which an air conditioner pipe flange is connected, a second side surface disposed between the first side surface and the third side surface, a fourth side surface facing the first side surface, A rectangular parallelepiped valve body having a fifth side facing the third side, first and fourth ports formed vertically on the first side, and second and third ports formed vertically on the third side. As an expansion valve comprising:
A rectifying plate disposed inside the first port and having a rectifying hole through which the refrigerant passes, and having a rib protruding from the first port along the outer circumference;
A refrigerant flow path configured to allow refrigerant flow between the first port and the second port; And
A driving unit disposed at an upper end of the valve body and controlling an opening degree on the refrigerant passage according to a temperature of the refrigerant flowing in the valve body; Expansion valve for a vehicle air conditioner comprising a. The method of claim 1,
An expansion valve for a vehicle air conditioner, the lower end of the diameter of the rectifying hole coincides with the lower end of the inner port of the first port. 3. The method according to claim 1 or 2,
The diameter of the rectifying hole is 0.3 to 0.6 of the diameter of the rectifying plate expansion valve for the air conditioner. The method of claim 1,
The rectifying plate is an expansion valve for a vehicle air conditioner manufactured by press working. The method of claim 1,
The driving unit includes:
A ball disposed on the coolant flow path to control opening and closing of the coolant flow path;
A ball seat for stably supporting the ball at the bottom of the ball,
A spring for applying an elastic force to the ball under the ball seat;
A temperature reduction chamber which provides a space for storing an operation gas that contracts and expands in accordance with the temperature of the refrigerant therein;
A diaphragm mounted on a lower portion of the thermosensitive chamber and deformed in a vertical direction by contraction and expansion of the working gas;
In close contact with the diaphragm and displacement of the diaphragm depends on the plate,
In the form of a rod, one end is in contact with the plate and the other end is connected to the ball operating rod that is operated up and down in conjunction with the displacement of the plate,
An expansion valve for a vehicle air conditioner having a cylindrical shape having a through-hole through which the operating rod is inserted on a central axis and disposed on an intersection path between the third port and the fourth port. 6. The method of claim 5,
The operating rod cover is an expansion valve for a vehicle air conditioner having a shape that can adjust the opening degree of the refrigerant passage. 6. The method of claim 5,
The operating rod cover is an expansion valve for a vehicle air conditioner comprising a plastic.

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