JP3538625B2 - Condensation prevention structure in refrigeration cycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a compressor and a condenser.
Dew condensation prevention structure in a refrigeration cycle connecting an expansion valve or a capillary tube and an evaporator, more specifically,
Expansion valve through which low boiling point refrigerant in refrigeration cycle passes or
The present invention relates to a dew condensation preventing structure for a terminal portion of an electric device connected near a capillary tube .

[0002]

2. Description of the Related Art As shown in FIG. 6, in an air conditioner, for example, a refrigerator, a compressor 31 is deactivated by a thermostat in order to keep a temperature in a refrigerator constant, and a refrigerant gas is cooled and liquefied in a condenser 32 and received. The liquid flows into a solenoid valve 34 provided in front of an expansion valve and a capillary tube 35 via a liquid container 33.
Here the solenoid valve 34, when the stop state of the compressor, the refrigerant flows into the low evaporator 36 temperature, with the temperature of the evaporator is prevented from rising, flowing into the evaporator 36, 36 ' It is provided for sorting. The former is based on the start and stop of the compressor, and the latter is based on the thermostat signal.
The electromagnetic valve 34 is opened and closed. Next, the liquid refrigerant is expanded at a low temperature by the expansion valve or the capillary tube 35, and the liquid refrigerant is evaporated by the evaporator 36 to cool the expansion valve, the capillary tube 35 and the electromagnetic valve 34. Next, the refrigerant returns to the compressor 31 via the evaporator outlet pipe 37.

As shown in FIG. 7, for example, as shown in FIG. 7, an electromagnetic coil 52 made of a copper wire wound around a bobbin 51 is sealed with a sealing material 53 such as a resin, and this is sealed with a metal outer box 54. Housed in. A suction element 55 is accommodated in a hollow portion at the center of the bobbin 51, and the suction element 55 is attached to the outer box 54 by a bolt 56. A plunger 57 is accommodated in the hollow portion at the center of the bobbin 51 so as to face the suction element 55, and the plunger 57 is slidable in a tube 58 provided on the hollow inner wall of the bobbin 51. The inflow pipe 60 and the outflow pipe 61 are connected to the tube 5
A valve seat 63 is formed on a valve body 62 that is integrally fixed by brazing together with the valve body 8, and a valve body 64 is mounted on the valve seat 63, and the valve body 64 is fitted to the plunger 57. The conductor 65 extends from the side of the outer box 54.

[Problems to be solved by the invention]

As shown in FIG. 8B, a terminal 66 is provided on the side of the sealing material 53 of the solenoid valve V, and a connector 67 is provided.
Is formed. Here, as described above, when the liquid refrigerant expands at a low temperature and the solenoid valve V is cooled, when the surrounding air is cooled and the water vapor contained in the air falls below the dew point,
The water vapor condenses to form water droplets, as shown in FIG. 8 (a), which may cause a short circuit due to the leakage of the nominally separated connector 67 and the corrosion of the internal connection portion, the conductive wire, and the like. Occurs.

Accordingly, the present invention provides a dew condensation preventing structure in which a terminal is not short-circuited even when dew is condensed on a coil in a refrigeration cycle by separating a winding portion and a terminal portion of an electric device near a valve body through which a low-boiling refrigerant passes. The purpose is to provide.

[0006]

According to the present invention, there is provided a compressor, a condenser, an expansion valve or a capillary.
Refrigeration cycle consisting of tube and evaporator connected
The expansion valve or capillary through which the low-boiling refrigerant passes.
The electric device connected near the tube connects the winding and the conductor.
A connection section is connected between the terminal section and the
The connecting part is made of one piece with stop material,
To separate the terminal portion from the winding portion, and
An air circulating portion between the winding portion and the terminal portion;
The condensate part is isolated from the winding part and extends downward.
It constitutes a prevention structure. The electric device is an electromagnetic
It may consist of a valve or an electronic expansion valve. The result
The dew prevention structure has a hollow terminal shape with terminals inside.
The hollow terminal part is made thinner.
You may.

According to the present invention, as described above, even if the liquid refrigerant is expanded at a low temperature by the expansion valve or the capillary tube in the refrigeration cycle and the electric device is cooled, it is difficult for cold air to be transmitted to the terminals, and the outside air temperature is reduced. Therefore, dew condensation on the terminal portion is prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.
I will tell. As shown in FIG. 1, FIG. 2 and FIG.1
The bobbin2Of copper wire wound aroundElectromagnetic coilConsisting of
The wire portion 3 is surrounded and sealed with a cylindrical sealing material 4 such as resin.
Is housed in a metal outer box 5. Hollow around bobbin 2
A suction element 6 is housed in the part, and it is sucked into the outer box 5 by bolts 7.
The child 6 is attached. In the hollow part of bobbin 2 center
The plunger 8 is housed opposite the suction element 6 and
8 slides in the tube 10 provided on the hollow inner wall of the bobbin 2.
It is free. Tubing the inflow pipe 11 and the outflow pipe 12
The valve body 1 which is brazed together with the valve 10 and is integrally fixed
3, a valve seat 14 is formed, a valve body 15 is placed on the valve seat 14,
The valve element 15 is fitted to the plunger 8, and the suction element 6
It is urged downward by a spring 16 provided between itself and the jaw 8.
Have been.

A connecting portion 17 extends from the sealing material 4. The connecting portion 17 has a small cross-sectional area so as not to receive heat conduction from the electromagnetic coil 3 portion. Further, the connection unit 1
A terminal portion 18 extends downward from 7. A conductor 19 extends through the bobbin 2 inside the connection portion 17. With these configurations, the terminal portion 18 is isolated from the electromagnetic coil 3. The terminal portion 18 has a hollow cylindrical shape, and a connector 20 connected to a conductor 19 is provided therein.
As shown in FIG. 3, the hollow terminal portion 18 is made thinner so as to easily absorb the temperature of the outside air.

FIG. 4 shows an example of an electronic expansion valve 30 as an electric device in the vicinity of the passage of a low-boiling refrigerant. A stator case made of synthetic resin is provided on the outer periphery of a stator having an electromagnetic coil (not shown) inside. 31 are formed. Below the stator case 31, there is formed a valve body 34 in which the inflow pipe 32 and the outflow pipe 33 are integrally fixed.

A connecting portion 35 is connected laterally from an upper end of the stator case 31, and a terminal portion 36 extends long downward from the connecting portion 35. The connecting portion 35 below the stator case 31 is narrowed inward as indicated by reference numeral 37. This makes it difficult for the temperature of the dew condensation portion to conduct. The terminal section 36 is provided with a connector 38. Connector 3
The lower part of the terminal part 36 from the vicinity of 8 is formed in a hollow shape. The hollow terminal portion 36 is made thinner like the one shown in FIG. 3 so as to easily absorb the temperature of the outside air.

FIG. 5 shows an example of the electronic expansion valve 30 similarly to FIG. 4, in which a connecting portion 35 extends laterally from an upper end of a stator case 31. Further, the connecting portion 35
The terminal part 36 extends downward from. The terminal portion 36 has a connector 38 provided therein. The hollow terminal portion 36 is formed to have a small thickness so as to easily absorb the temperature of the outside air to prevent dew condensation on the terminal portion 36.

Here, in a refrigeration cycle in which a compressor, a condenser, an expansion valve, and an evaporator are connected, the liquid refrigerant expands at a low temperature by an expansion valve or a capillary tube through which a low-boiling refrigerant passes, and the expansion valve, the capillary tube, or the like. If the piping and solenoid valve connected to this are cooled and fall below the dew point of the surrounding atmosphere, water vapor in the air may condense on these devices and cause electrical leakage at the connector.

However, as described above, since the terminal portion of the electric device is isolated from the winding portion and the air circulation portion is provided between the winding portion and the terminal portion, it is difficult for the cool air to be transmitted to the terminal portion, and the air circulation portion is not provided. The terminal portion is easily affected by the temperature of the outside air, so that no dew condensation occurs on the terminal portion.

The dew condensation state of the solenoid valve of the present invention in which the terminal portion is isolated from the winding portion was compared. That is, a thermocouple was fixed to each of the winding part and the terminal part of the coil with epoxy resin, and only the electromagnetic valve body was cooled with dry ice. At this time, the dry ice was prevented from contacting the coil and the outer box other than the main body. While recording the two points of the coil, the two points of the main body, and the temperature of the atmosphere, the state where dew or frost adhered to the winding part and the terminal part of the coil was observed. Table 1 shows the results of these experiments.

[0016]

[Table 1]

As shown in Table 1, even when dew was formed on the coil windings, no dew was formed on the terminals. Further, in the solenoid valve of the present invention, as a result of measuring the insulation resistance between the lead wire, the main body, and the coil after 3 hours, it was confirmed that there was no short circuit between the terminals in Δ.

In the embodiment, the electric device is shown as a solenoid valve or an electronic expansion valve. However, as another embodiment, it may be applied to a solenoid proportional valve or the like.

[0019]

According to the dew condensation preventing structure of the present invention, the connecting portion is formed by separating the winding portion and the terminal portion of the electric device in the vicinity of the valve body through which the low-boiling-point refrigerant passes by the above-described structure and operation. However, since the heat of the winding portion is hardly conducted to the terminal portions by reducing the cross-sectional area or the like, even if dew forms on the coil, the terminal portions do not condense and there is no short circuit between the terminals. Also,
Since the inside of the terminal part is formed in a hollow shape and the thickness is reduced,
The temperature difference between the outer peripheral surface and the inner surface is reduced, and dew condensation on the terminal portion can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a plan view of the solenoid valve shown in FIG.

FIG. 3 is a bottom view of the same.

FIG. 4 is a partial cross-sectional front view of an electronic expansion valve according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional front view of an electronic expansion valve according to a third embodiment of the present invention.

FIG. 6 is a refrigeration circuit diagram of the air conditioner.

FIG. 7 is a sectional view of a conventional solenoid valve.

8 shows a terminal portion of the solenoid valve of FIG. 7, (a) is an enlarged plan view thereof, and (b) is a plan view of a terminal portion of the solenoid valve.

[Explanation of Signs] 1 Solenoid valve 2 Bobbin 3 Winding part 4 Sealing material 5 Outer case 6 Suction element 8 Plunger 11 Inflow pipe 12 Outflow pipe 13 Valve body 14 Valve seat 15 Valve element 17 Connection part 18 Terminal part 20 Connector 30 Electronic expansion valve

Continuation of front page (56) References JP-A-4-228984 (JP, A) JP-A-4-263759 (JP, A) JP-A-54-21648 (JP, A) JP-A-62-116876 (JP) , A) Jikken 49-7969 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 41/06

Claims (4)

(57) [Claims] 1. A compressor, a condenser, an expansion valve or a capillary.
Refrigeration cycle consisting of tube and evaporator connected
The expansion valve or capillary through which the low-boiling refrigerant passes.
The electric device connected near the tube connects the winding and the conductor.
A connection section is connected between the terminal section and the
The connecting part is made of one piece with stop material,
To separate the terminal portion from the winding portion, and
An air circulating portion between the winding portion and the terminal portion;
The dew condensation preventing structure in the refrigeration cycle, wherein the child part is separated from the winding part and extends downward . 2. The electric device according to claim 1, wherein the electric device comprises a solenoid valve.
The dew condensation prevention structure in the refrigeration cycle described in the above. 3. The dew condensation preventing structure in a refrigeration cycle according to claim 1, wherein said electric device comprises an electronic expansion valve. 4. The dew condensation in a refrigeration cycle according to claim 1, wherein the terminal portion is formed in a hollow shape having a connector therein, and the hollow terminal portion has a reduced thickness. Prevention structure.