JPH06137726A - Mounting layout of high and low pressure switch and fusible plug for car air conditioning device - Google Patents

Abstract

PURPOSE:To enhance detection response and sensibility of excessive and minimum pressures and excessive temperature in a high and low pressure switch and a fusible plug by installing the high and low pressure switch between a compressor and a condenser and the fusible plug between the condenser and a receiver dryer. CONSTITUTION:A high and low pressure switch 4 is mounted to an inlet block 8 of a condenser 2 while a fusible plug 5 is mounted to an outlet block 11 of the condenser 2. A pipeline 9 from a compressor is inserted into one side of the inlet block 8 of the condenser 2. The high and low pressure switch 4 is mounted to the side opposed to the pipeline 9. A third side is connected to the condenser 2. Even when a refrigerant passage in the condenser 2 is clogged, the high and low pressure switch operates with sensibility in the clogged state, thereby carrying out its performance to a satisfactory extent. In addition, of by detecting the stabilized temperature of the refrigerant by heat exchange with condensation inside the combenser 2 the fusible plug is possible to operate definitely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting arrangement of high and low pressure switches and melting taps for an air conditioner for automobiles.

[0002]

2. Description of the Related Art FIG. 1 is a block diagram of an air conditioner for an automobile having a high pressure switch and a mounting arrangement of a melting plug according to the prior art.

The refrigerant compressed by the compressor 1 is sent to the evaporator 7 via the condenser 2, the receiver dryer 3, the high / low pressure switch 4, the melting plug 5, and the expansion valve 6, and takes heat from the surroundings to return to the compressor 1 again. .

FIG. 2 is a partial sectional view of the high and low voltage switch. This switch stops the operation of the compressor 1 when the pressure of the refrigerant becomes equal to or higher than a predetermined maximum pressure (eg, 2.65 MPa) or becomes equal to or lower than the minimum pressure of the pressure (eg, 0.20 MPa), It has the function of protecting the system.

FIG. 3 is a sectional view of the melting plug. This stopper has a portion 5a sealed with low melting solder, and has a function of protecting the system by discharging the refrigerant gas in the system when the temperature of the refrigerant exceeds a predetermined maximum temperature.

[0006]

In the prior art, the high and low pressure switch 4 and the melting tap 5 are the receiver dryer 3 and the expansion valve 6.
Was placed between. That is, a condenser 2 and a receiver dryer 3 are provided between the compressor 1 and the high / low voltage switch 4.
Exists. Therefore, a delay in response until the pressure rise is detected by the high / low pressure switch is unavoidable, and there is a problem in that the detection sensitivity is lowered particularly when the capacitor 2 is clogged.

Although the temperature in the system is the highest near the compressor 1 and the condenser 2, since the fusible plug is arranged at a position far from these, there is a response delay in the temperature detection and the detection sensitivity. There is a problem that is small.

An object of the present invention is to propose a mounting arrangement of high and low pressure switches and melting taps of an automobile air conditioner which can solve or reduce these problems.

[0009]

Means for Solving the Problems The above problems include a compressor, a condenser, a receiver dryer, an expansion valve, an evaporator, a high / low pressure switch, and a fusible plug.
Compressor, condenser, receiver dryer,
In the mounting arrangement of the expansion valve, the evaporator, and the high-low pressure switch and the melting tap of the automotive air conditioner in which the compressor forms a closed circuit in which the compressor is arranged in this order, the high-low pressure switch is arranged between the compressor and the condenser, This has been solved by the mounting arrangement of the high and low pressure switch and the melting tap of the automotive air conditioner, which is characterized in that the melting tap is arranged between the condenser and the receiver dryer.

[0010]

[Operation] Since the high / low pressure switch is arranged between the compressor and the condenser, even if the refrigerant passage in the condenser is clogged, the high / low pressure switch operates sensitively and sufficiently performs its function. Further, since the melting plug is arranged between the condenser and the receiver dryer, the condenser detects the temperature of the stable refrigerant by the condensation heat exchange, and the operation is ensured.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4 is a block diagram of an example of an automobile air conditioner having a mounting arrangement of high and low pressure switches and melting taps for an automobile air conditioner according to the present invention. Since the embodiment shown in FIG. 4 is an improvement over the prior art shown in FIG. 1, the corresponding components are designated by the same reference numerals and their description is omitted.

In this embodiment, the high / low voltage switch 4
Is attached to the inlet block of the condenser 2,
Is attached to the outlet block of the condenser 2.

FIG. 5 is a sectional view of a portion of the inlet block of the condenser 2. A pipe 9 from the compressor 1 is inserted into one side face of the condenser inlet block 8, and a high / low pressure switch 4 is attached to a side face opposite to the pipe 9. The third side surface is connected to the capacitor 2. The piping is attached by bolts 10.

FIG. 6 is a perspective view of the condenser 2 in which a high / low pressure switch is attached to the inlet block 8 and a melting plug is attached to the outlet block 11.

In the embodiment in which the high and low pressure switches and the melting taps are mounted on the inlet block and the outlet block of the condenser 2 as described above, a dedicated mounting block for the high and low pressure switch and the melting taps is not required, and therefore the welding points are Decrease. Therefore, reliability against refrigerant leakage is improved. Also,
Since the required occupied volume is reduced due to these installations,
The degree of freedom in automobile layout design is increased.

[0016]

【The invention's effect】

1) The response and sensitivity to the excessive and excessive refrigerant pressure are improved. 2) Response and sensitivity to excessive refrigerant temperature are improved. 3) When the high / low pressure switch and the melting plug are mounted on the inlet block and outlet block of the condenser, the volume occupied for mounting can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an air conditioner for an automobile having a mounting arrangement of a high pressure switch and a melting plug according to the related art.

FIG. 2 is a partial cross-sectional view of a high / low voltage switch.

FIG. 3 is a sectional view of a melting plug.

FIG. 4 is a block diagram of an example of an air conditioner for an automobile having a mounting arrangement of a high / low pressure switch and a melting plug of the air conditioner for an automobile according to the present invention.

5 is a sectional view of a portion of an inlet block of the condenser 2. FIG.

FIG. 6 is a perspective view of the condenser 2 in which a high / low pressure switch is attached to the inlet block 8 and a melting plug is attached to the outlet block 11.

[Explanation of symbols]

 1 Compressor 2 Capacitor 3 Receiver Dryer 4 High / Low Pressure Switch 5 Melting Plug 6 Expansion Valve 7 Evaporator 8 Capacitor Inlet Block 9 Piping 10 Volt 11 Capacitor Outlet Block

Claims (2)

[Claims] 1. A compressor, a condenser, a receiver dryer, an expansion valve, an evaporator, a high / low pressure switch, and a plug, and a compressor, a condenser, a receiver dryer, an expansion valve, and an evaporator.
In the mounting arrangement of the high and low pressure switches and the melting taps of an automobile air conditioner forming the closed circuit in which the compressors are arranged in this order, the high and low pressure switches are arranged between the compressor and the condenser, and the melting taps are the condenser and the receiver dryer. The high-low pressure switch and the faucet mounting arrangement of an air conditioner for an automobile, which are characterized in that they are arranged between. 2. The high / low pressure switch for an automobile air conditioner according to claim 1, wherein the high / low pressure switch is attached to the inlet block of the condenser 2, and the melting plug 5 is attached to the outlet block of the condenser 2. And the installation arrangement of the melting tap.