KR20060119549A - Thermo expansion valve equipped with bypass channel - Google Patents

Abstract

An expansion valve equipped with a bypass path is provided to decrease the noise caused from the movement of the refrigerant by containing the opening and closing device opening and closing the bypass path. An expansion valve equipped with a bypass path comprises a first inlet path(100a) receiving the refrigerant compressed from the compressor; a valve chamber(30a) arranged with valve bodies(30,31) receiving/expanding the refrigerant and opening/closing a throttle path(50); a first outlet path(100b) transmitting the expanded refrigerant discharged from the valve chamber to the evaporator; a bypass path(80) placed between the valve chamber and the first outlet path to be spatially communicated with the valve chamber and the first outlet path; and an opening and closing device(90) opening and closing the bypass path.

Description

Expansion valve equipped with bypass channel

1 is a configuration diagram showing a system configuration of an air conditioner.

Figure 2 is a perspective view showing a conventional expansion valve.

3 is a cross-sectional view of FIG.

4 is a cross-sectional view showing an expansion valve according to the present invention.

**** Explanation of symbols on the main parts of the drawing ****

30a: valve chamber 50: throttle flow path

80: bypass euro 90: opening and closing

91: drive rod 300: drive means

100a: first inflow channel 100b: first inflow channel

100c: second inflow channel 100d: second inflow channel

1: Japanese Patent Laid-Open Publication No. 1995-151422.

2: Japanese Patent Laid-Open No. 1998-073345.

The present invention relates to an expansion valve having a bypass flow path.

More specifically, the present invention forms a bypass flow path in the expansion valve provided in the vehicle air conditioning system so that the initial flow of the mixed refrigerant mixed with the liquid phase and the gas phase flows through the bypass flow path. An expansion valve to prevent the generation of noise caused by the flow.

1 is a configuration diagram showing a system configuration of an air conditioner, and the refrigerant in the air conditioner system repeats a circulating cycle of four stages largely according to a thermodynamic vapor compression and expansion cycle. This circulation cycle specifically includes the compression of the refrigerant by a compressor, the condensation of the refrigerant by a condenser, the expansion of the refrigerant through an expansion valve (TXV), and the refrigerant through an evaporator. By evaporation of In each stage, the refrigerant is phase-changed into a high temperature high pressure gas, a room temperature high pressure liquid, a low temperature low pressure liquid, and a low temperature low pressure gas phase, respectively.

In the compression step, as the refrigerant in the gas phase is compressed by adiabatic compression of the compressor, the temperature and pressure of the refrigerant are increased. High-temperature, high-pressure gas can be easily liquefied by ambient air at room temperature due to the high condensation temperature. Therefore, in the refrigerating cycle, it is preferable to use a material that can be easily condensed. The refrigerant is well known and widely used.

On the other hand, the refrigerant condensed in the condensation step is changed into a liquid at room temperature and high pressure flows into the expansion valve.

The refrigerant introduced into the expansion valve undergoes an irreversible isotropic change in the expansion valve, and the pressure drops rapidly due to an orifice effect while the liquid refrigerant at room temperature and high pressure passes through the narrow throttle passage 50. In addition, according to the Joule-Thompson principle, the gas at room temperature excluding hydrogen is cooled when passing through the orifice at or below the threshold temperature. Will bring the temperature below zero.

The ultimate purpose of the refrigeration cycle in the vehicle air conditioning system is to cool the inside of the vehicle. For this purpose, in the final evaporation step, the refrigerant passes through the evaporator to form cold air by absorbing and vaporizing the heat of the surrounding air to form cold air. Lowers.

The heat exchanged refrigerant is then introduced into the evaporator and compressed to circulate the refrigeration cycle forming a closed system.

In this refrigeration cycle, the conventional expansion valve is made of a technical configuration as shown in Figs. That is, in the conventional expansion valve, the diaphragm 20 and the ball valve 30 are connected by the connecting rod 10, and the atmospheric pressure chamber 21 and the lower pressure chamber 22 of the diaphragm 20 are connected. The connecting rod 10 moves up and down by the pressure difference between The flow rate of the refrigerant is determined by opening and closing the ball valve 30 by driving the connecting rod 10. The refrigerant flowing from the condenser through the first inflow passage 100a is expanded through the throttle passage 50 while the ball valve 30 is opened, and is discharged to the evaporator through the first outlet passage 100b. Here, reference numeral 31 is a valve support, 32 is a spring, 40 is a capillary tube (capillary tube).

However, when the driving of the cooling system is stopped and a predetermined time has elapsed, there is a refrigerant mixed with a liquid phase and a gaseous phase in the vicinity of the first inflow passage 100a. In this case, the problem with the conventional expansion valve is that the cooling system is driven again. While the refrigerant passes through the narrow throttle passage 50, it generates an unpleasant noise.

As a prior art for solving this problem, for example, Japanese Patent Laid-Open No. 1998-73345 has formed a fine flow path near the outer circumference of the connecting rod.

However, the expansion valve of the Patent Publication No. 1998-73345 adopts a separate solenoid valve. In addition, since the occurrence of noise is prevented by suppressing the rapid flow of the refrigerant in the expansion valve, many internal configurations are adopted for this purpose, and the coupling relationship between the components is very complicated.

The present invention has been made in view of the problems with the prior art in the technical field to which the present invention belongs, and an object of the present invention in the expansion valve of the air conditioning system, the noise due to the refrigerant flow through a simpler configuration It is to implement an expansion valve that can prevent the occurrence more effectively.

The object of the present invention is not limited to the above object, and other objects of the present invention which are not mentioned may be clearly understood by those skilled in the art from the following description and the accompanying drawings. will be.

In order to achieve the above object, the present invention provides a valve having a first inflow passage (100a) for receiving the refrigerant condensed from the condenser and a valve body (30, 31) for accommodating and expanding the refrigerant and opening and closing the throttle passage (50). An expansion valve for a vehicle air conditioner cooling system having a chamber 30a and a first outflow passage 100b for discharging the expanded refrigerant flowing out of the valve chamber 30a to an evaporator, wherein the valve chamber 30a and A bypass passage 80 interposed between the first outlet passage 100b and spatially communicating with the valve chamber 30a and the first outlet passage 100b; And opening and closing port 90 for opening and closing the bypass flow path (80); It is characterized by consisting of.

In the present invention, the opening and closing port 90 opens the bypass passage 80 while the cooling system is not driven, and opens the bypass passage 80 only for a predetermined time after the cooling system is driven. It is done.

The opening and closing port 90 preferably opens the bypass passage 80 for 5 to 10 seconds after the cooling system is driven.

The present invention may include a control unit for controlling the opening and closing door 90 to close and then open the bypass passage 80 for a few seconds during the initial driving of the cooling system.

Specific embodiments of the present invention are included in the following description and the drawings, it will be described a preferred embodiment of the present invention with reference to the accompanying drawings. However, the contents that deviate from the gist of the present invention or conform to the prior art will not be described and focus only on the features of the present invention.

4 is a side cross-sectional view showing an expansion valve according to the present invention. As shown in the present invention, a bypass passage 80 and an opening and closing port 90 for opening and closing the bypass passage 80 are formed in the expansion valve. There is a characteristic. In order to more clearly disclose the present invention, in FIG. 4 the bypass flow path 80 is shaded.

The bypass flow path 80 is interposed between the valve chamber 30a and the first outflow path 100b and transfers the refrigerant introduced from the condenser through the first inflow path 100a to the first outflow path. It is provided as a flow channel of the refrigerant to bypass to (100b). Preferably, the cross-sectional area of the bypass flow path 80 should be larger than the cross-sectional area of the throttle flow path 50.

The valve chamber 30a is provided with valve bodies 30 and 31 which are connected to the diaphragm 20 as a connecting rod 10 and are moved up and down.

The valve body is composed of a ball valve 30 in contact with the connecting rod 10, and a valve support 31 for supporting the ball valve 30, the ball valve 30 to the connecting rod 10 The valve support 31 is supported by the spring 32 to always be in contact. In addition, the upper pressure chamber 21 and the lower pressure chamber 22 divided by the diaphragm 20 are respectively formed on the upper and lower portions of the diaphragm 20, and the pressure chamber 21 is a capillary tube. One end of the capillary tube 40 is coupled to communicate the atmospheric pressure chamber 21 with the capillary tube 40.

Reference numeral 100c denotes a second inflow passage that receives the refrigerant heat exchanged in the evaporator, and 100d is a second outlet passage that transfers the refrigerant heat exchanged in the evaporator to the compressor.

On the other hand, in the present invention, the opening and closing port 90 is provided to open and close the bypass flow path (80). The opening and closing port 90 is inserted into the bypass flow path 80 so as to shield the bypass flow path 80, and receives the driving force from the driving means 300 to open and close the bypass flow path 80. .

As the driving means 300, for example, a solenoid may be used or an actuator may be used. The driving means 300 is connected to the opening and closing port 90 by the driving rod 91. In addition, the driving means 300 and the power supply unit (not shown) and the control unit (not shown) may be electrically connected, so that the driving means 300 may be selectively driven according to the control signal of the control unit. .

Hereinafter, the present invention will be described more clearly by looking at the operational relationship of the present invention.

When the cooling system is not driven, there is no refrigerant flow, the valve support 31 is elevated by the spring 32, and the ball valve 30 is closing the throttle flow path 50. In addition, there is no driving of the driving means 300, and the bypass flow path 80 is opened and lowered by the weight of the driving rod 91 and the opening and closing port 90. In addition, near the first inflow passage 100a, the refrigerant when the immediately preceding cooling system is driven is present as a mixture of the liquid phase and the gaseous phase.

According to the conventional expansion valve, the refrigerant generated noise while passing through the throttle passage 50 during the initial driving of the cooling system, but the present invention can prevent the noise for the following reasons.

While the bypass flow path 80 is open when the cooling system is initially operated, the internal coolant of the bypass flow path 80 is larger than the cross-sectional area of the throttle flow path 50, and thus the refrigerant present in the first inflow path 100 a. Most flows through the bypass flow path 80 and is pre-inflowed into the evaporator through the first outflow path 100b. Therefore, the refrigerant in the mixed state does not pass through the narrow throttle passage 50, there is no noise generated in the expansion valve.

After the cooling system is driven, the power supply unit is driven. Preferably, the driving unit 300 is driven after a predetermined time after the cooling system is driven by setting the driving time interval of the power supply unit. 5-10 seconds is sufficient for this time relay.

Therefore, after the cooling system is driven, the refrigerant of the first inflow passage 100a flows to the evaporator through the bypass passage 80 for about 5 to 10 seconds, and there is no noise. After that, the set time is taken from the control unit. The power supply unit and the driving means 300 which receive the driving signal are driven to drive the driving rod 91. By opening and lowering the driving rod 91, the opening and closing port 90 is inserted into the bypass flow path 80 to close the bypass flow path 80.

When the driving of the cooling system is finished, the operation of the driving means 300 is stopped and the opening and closing port 90 descends to open the bypass flow path 80.

Opening and closing of the throttle flow passage 50 is implemented by the raising and lowering of the ball valve 30 by the spring 32 and the diaphragm 20, this mechanism is as well known, so the description thereof will be omitted.

As described above with respect to the expansion valve according to the present invention, which is presented as at least one or more embodiments by which the spirit and the construction and operation of the present invention is not limited. The embodiments presented are provided to completely disclose the scope of the invention to those skilled in the art to which the present invention may be fully disclosed, and the present invention is limited to the above embodiments. Rather, it is defined by the claims below, and may be embodied in various different forms within the scope of the following claims, which also belong to the scope of the present invention.

The expansion valve according to the present invention described above can remove the noise generated when the refrigerant present in the mixture of the liquid phase and the gas phase when passing through the expansion valve.

In addition, since the technical configuration adopted to obtain such an effect is relatively simple and simple and clear compared to the prior art, the burden in terms of cost does not occur.

Claims (3)

A valve chamber 30a provided with a first inflow passage 100a for receiving refrigerant condensed from the condenser, valve bodies 30 and 31 for accommodating and expanding the refrigerant and opening and closing the throttle passage 50; In the expansion valve for a vehicle air conditioner cooling system provided with a first outflow passage (100b) for discharging the expanded refrigerant flowing out from the (30a) to the evaporator, A bypass passage 80 interposed between the valve chamber 30a and the first outlet passage 100b and spatially communicating with the valve chamber 30a and the first outlet passage 100b; And An opening and closing hole 90 for opening and closing the bypass flow path 80; Expansion valve comprising a. The method of claim 1, The opening and closing port 90, An expansion valve, characterized in that the bypass flow path (80) is opened while the cooling system is not driven, and the bypass flow path (80) is opened only for a predetermined time after the cooling system is driven. The method of claim 2, Expansion valve, characterized in that for opening and closing the bypass 90 is opened for 5 seconds to 10 seconds after the bypass passage (80).

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