JPS6033471A - Manufacture of controller for refrigerant flow path - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method of manufacturing a refrigerant flow control device that is installed in piping of a cooling device or the like and controls the flow path.

(B) Prior Art Conventionally, for example, in a refrigerator, the refrigerant circuit that forms the cooling device is constructed by sequentially connecting a compressor, a condenser, a capillary tube as a pressure reducer, an evaporator, an achiemulator as a refrigerant reservoir, etc. are doing. Conventionally, a reciprocating compressor has been used as this compressor, but this reciprocating compressor is large compared to its capacity, so it has the disadvantage of reducing the internal volume of the refrigerator and expanding the installation space. was. Therefore, in recent years, rotary compressors, whose performance has been improved through technological innovation, have begun to be used. Since this rotary compressor can be made compact, it is possible to expand the internal volume of the refrigerator and reduce the installation space at the same time. However, due to its structure, when the compressor is stopped, the suction side is at high pressure, and high-temperature refrigerant flows through the acheimulator. backflow to the evaporator through the evaporator. Furthermore, since the high-temperature refrigerant also flows through the capillary cheep, the temperature of the evaporator increases and the inside of the refrigerator is heated.

Therefore, a check valve is installed on the suction side of the rotary compressor, and a pressure-operated valve is installed in the flow path between the evaporator and the condenser, which is operated by the pressure difference between the flow path and the compressor suction side. When the compressor is stopped, the flow path is closed to prevent high-temperature refrigerant from flowing into the evaporator. However, when these various valve devices are installed separately in the refrigerant circuit, the piping This has the disadvantage that the connection becomes multiple shafts, which increases the size of the entire cooling device.

(c) Purpose of the Invention The present invention aims to miniaturize a refrigerant flow control device such as a pressure-operated valve or a check valve, improves the workability of incorporating it into a refrigerant circuit, and simplifies the assembly of the refrigerant flow control device itself. and t=manufacturing method.

B) Structure of the Invention The present invention includes a cylindrical accumulator body with both ends open,
It has a refrigerant inflow pipe, a refrigerant outflow pipe, a connection pipe with a check valve installed therein, and a pressure transmission means having a built-in valve body connected to the flow path and extending toward the back side of the valve body. A pressure-operated valve is prepared, one end of the accumulator body is closed with a plurality of communication holes formed, and a refrigerant inflow pipe and a connection pipe are connected to the communication holes to communicate with the accumulator main body, and the The check valve has a forward direction in which the refrigerant flows out from the accumulator body, and the pressure-operated valve has a pressure transmission pipe inserted into the accumulator body through the opening at the other end, and its end extended outside the accumulator body through the communication hole. After the pressure transmission pipe and the refrigerant outflow pipe are attached to the accumulator main body with the other end opening closed, the pressure transmission pipe and the refrigerant outflow pipe are connected to the open end of the connecting pipe on the outside of the accumulator main body.

(e) Embodiments The present invention will be explained in detail with reference to drawings. Figure 1 is a refrigerant circuit diagram for a refrigerator (which will be described later). (1) is a single-rotor no-compressor, and the high-temperature, high-pressure gas refrigerant discharged from the compressor (1) flows into the condenser (2). It radiates heat and liquefies, and then is depressurized in the capillary tube (3), passes through the refrigerant flow path control device (4) of the present invention, flows into the evaporator (5), is almost vaporized, and is liquefied again in the flow path. Circulation is performed through the control device (4) and back to the compressor (1).Here, the suction side of the compressor (1) is connected to (lb), and the outflow side piping of the capillary chest (3) is connected to (3a). , the inlet side piping of the evaporator (5) (5a)
, the outflow side of the evaporator (5) is designated as (5b).

FIG. 2 shows a perspective view of the refrigerant flow control device (4). As shown in the cross-sectional view of FIG. 1, the refrigerant flow control device (4) includes an accumulator body (6) for storing unevaporated liquid refrigerant in the evaporator (5), and is attached to the accumulator body (6). A pressure-operated valve (7), a refrigerant inflow pipe (8) communicating with the outflow side (5b) of the evaporator (5), and a check valve (9)
The refrigerant outlet pipe (11) is attached to the connection pipe 0 and communicated with the suction side (lb) of the compressor (1).

The accumulator main body (6) is made of a large cylindrical tube made of aluminum, etc. The upper end opening is crushed to form a plurality of communication holes (6a), (6b), and (6c), and the lower end opening is left open. It will later be closed by a pressure-operated valve (7). The pressure-operated valve (7) is connected to the inlet (1) to which the outlet pipe (3a) of the capillary tube (3) is connected.
2a), a main body (121) having an outlet (12b) to which the inlet pipe (5a) of the evaporator (5) is connected;
21 The lower lid (13) attached to the top, the upper lid Q4) attached to close the upper opening of the lower lid, and the lower lid (13)
A diaphragm (19) inserted between the upper lid 04, a valve body aη which is attached to the substantially central part of the lower surface of the diaphragm 051 and faces inside the main body a2 so as to be able to move up and down, and a sphere (161) is fixed to the lower end, Extending to the top lid (14)
It consists of a pressure transmission pipe attached to the inlet (12
a) Or, if the pressure inside the pressure transmission pipe α8 is higher than the refrigerant pressure at the outlet (12b), for example, the difference is 0.4 or more, the diaphragm swells downward and the valve body aη
Press down to bring the sphere Q61 into close contact with the inlet (12a) to close the flow path, and also
121))) is higher than the pressure inside the pressure transmission pipe u81, or even if the pressure inside the pressure transmission pipe 081 is high, the difference does not reach 0.4~, the diaphragm (19 does not swell and the valve body 0η is configured to open the flow path.The size of the upper and lower lids αa03 should match the size of the lower end opening of the accumulator body (6).The check valve (9) is installed with a gap at the bottom of the connecting pipe 00). to form a caulked part αα■,
Both caulking parts 0! 'I (movably insert the valve body (211 between 21,
The accumulator body (6)
The forward direction is the direction in which the refrigerant flows out from inside.

Next, a method of assembling the refrigerant flow control device (4) will be explained. First, a large-diameter tube is cut to an appropriate length to prepare the achimulator body (6). The opening at the upper end of the achimulator main body (6) is crushed by placing a suitable bar material therein to form communication holes (6a), (6b), and (6c). The refrigerant inflow pipe (8) is connected to the communication hole (6a), and the refrigerant inflow pipe (8) is connected to the communication hole (6C).
), insert the connecting pipes 00) into the accumulator body (6) and open them above the expected maximum refrigerant liquid level (υ).The rain pipes (8) aα are approximately parallel and in the same direction. Also, the check valve (9) is located inside the achievator body (6).Both piping (8E
O) is fixed to the accumulator body. On the other hand, the pressure operated valve (7) is located on the straight pressure transmission pipe side of the accumulator body (
6) into the accumulator main body (6) through the lower end opening, and with the end pulled out from the communication hole (6b), the accumulator main body (6) f/14! come into contact with At this time, the lower end opening of the accumulator body (6) is closed by the pressure-operated valve (7). Then, bend the upper end of the pressure transmission pipe (181, that is, the protruding part of the accumulator main body (6 points, and connect the connecting pipe 00) to the enlarged pipe part (10a) formed at the outer open end of the accumulator main body (6). On the downstream side of the stop valve (9), the refrigerant outflow pipe (I
The refrigerant flow path control device (4) is completed by connecting and fixing the refrigerant flow path control device (4) with ll.

Since the refrigerant flow control device (4) of the present invention has the above-described configuration, the number of pipes protruding from the accumulator body (6) is three upwards and two downwards. ) because it is inserted through the device (4).
) The overall dimensions are extremely compact, reducing installation space. Furthermore, since the accumulator body (6), the pressure-operated valve (7), and the check valve (9) are integrated, piping connections are simplified and the overall size of the cooling device is reduced. or,
The refrigerant inlet pipe (8) and the connecting pipe 00) are inserted from above in the same direction, and are opened above the refrigerant level, making installation easy and achieving reliable gas-liquid separation.

Furthermore, in the present invention, in order to close the lower end of the accumulator main body (6) with a pressure-operated valve (7), the middle part of the pipe is bulged and enlarged as in the conventional case, or both ends of a thick pipe are crushed. It is only necessary to crush one side of the large pipe,
The number of work steps is reduced, making it suitable for mass production. In addition, the refrigerant inflow pipe (
8) and the connecting pipe a [are inserted and connected from the same direction, and the pressure transmission pipe side is also connected outside the accumulator body (6), so assembly is easy and workability is good.

The refrigerant flow path control device (4) configured in this way is the third
As shown in Figures 6 to 6, the refrigerator (which is installed in the refrigerator).

Components with the same reference numerals in the drawings are the same. Figure 3 4
In the figure, - is the outer box, (31) is the inner box, and between both boxes QO131) is the insulation material (321 is filled with foam). (c) is the inner box C3
11 and filled with a heat insulating material (321), it is a partition wall that divides the inside of the refrigerator into the freezer compartment 04 and the refrigerator compartment C351. A cooling chamber (36) is formed within the partition wall C331, and the evaporator (5) is housed within this cooling chamber (36). The air cooled by this evaporator (5) is sent to the blower 0.
'7) through the duct (c), and both chambers C
(4) It is discharged and circulated to C151. Refrigerant flow control device (
4) forms a recess G91 in the inner box c31) at the rear of the cooling chamber 06), stores it in the recess C31, and closes it with a molded heat insulating material (40) of a predetermined shape to insulate the surrounding area.

5 and 6 show a refrigerator (R) in which a cooling chamber (G) is formed by a partition plate (4υ) behind a freezing chamber 04J, and an evaporator (5) is installed vertically. In this case, the refrigerant flow control device (4) is buried in the heat insulating material (3) near the evaporator (5) at the same time as the heat insulating material C32+ is foamed. Pressure operated valve (7) if insulated
This prevents the accumulator from being affected by the temperature of the outside air, thereby stabilizing the operation and preventing frost from forming on the accumulator body (6) and the like. Furthermore, since it is provided near the evaporator (5), the length of the piping can be kept to the shortest distance.

To explain the operation of the refrigerant circuit with the above configuration, when the compressor (1) is operating, the pressure on the suction side (lb) is low, so the pressure inside the pressure transmission pipe a8 is also low, so the valve body fin is not open as a flow path. There is. Further, the check valve (9) also opens the flow path and the refrigerant circulates as shown by the arrow in the figure.

Next, when the compressor (1) stops, the suction side of the compressor (1) (
As the high temperature refrigerant flows backward from the pressure transmitting pipe (12), the pressure inside the pressure transmission pipe rises rapidly, causing the inlet (12) of the pressure operated valve (7) to rise rapidly.
a) The pressure becomes higher than the pressure at the outlet (121+) and the valve body an
is pushed down to close the inlet (12a). Also, since the check valve (9) also closes the flow path, the capillary tube (3)
This prevents high-temperature refrigerant from flowing into the evaporator (5) and high-temperature refrigerant from the suction side (11) of the compressor (1) into the evaporator (5), thereby preventing a rise in temperature inside the refrigerator. By keeping the temperature low, the load upon restarting the compressor (1) is reduced. Further, since the backflow refrigerant from the compressor (1) does not flow into the accumulator main body (6), there is no shortage of refrigerant at the time of restart.

Furthermore, since the pressure-operated valve (7) uses the refrigerant pressure between the capillary tube (3) and the evaporator (5), the compressor (1)
) can be extremely shortened until the pressure-operated valve (7) is closed.

(F) Effects of the Invention According to the present invention, the pipes protruding from the accumulator main body can be arranged vertically, and the pressure transmission pipe of the pressure-operated valve is inserted through the accumulator main body, so the dimensions of the refrigerant flow path control device are can be made very small, reducing the installation space. Furthermore, since the accumulator body, pressure-operated valve, and check valve are integrated, piping connections are simplified.

Furthermore, there is no need to drill a hole in the side surface of the cylindrical accumulator body, and since the opening at the other end is closed by a pressure-operated valve, it is only necessary to form a communication hole at one end, reducing the number of assembly steps. Significantly reduced. In addition, since the end of the pressure transmission pipe of the pressure-operated valve is connected to the connecting pipe after extending it outside the accumulator body, the work is much easier than connecting it inside the accumulator body. 0 that has the effect of becoming

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIG. 1 is a refrigerant circuit diagram including the refrigerant flow control device of the present invention, FIG. 2 is a perspective view of the refrigerant flow control device, and FIG. 3 is a refrigerator. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a longitudinal sectional view showing another embodiment of the refrigerator, and FIG. 6 is a sectional view taken along the line B-B in FIG. 5. In the figure, No. 1 grip (4)...refrigerant flow path control device, (6
)...Accumulator body, (6a) (6b) (6c
) Series of communication holes, (71...pressure operated valve, (8)...
・Refrigerant inflow pipe, (9)...Check valve, 0 connection pipe, 08...Pressure transmission pipe. Figure 4Figure 3

Claims (1)

[Claims] 1° A cylindrical accumulator body with both ends open, a refrigerant inflow pipe, a refrigerant outflow pipe, a connecting pipe with an internal check valve, and a valve body connected to the flow path are built in. A pressure transmission pipe comprising a pressure transmission pipe extending in the rear direction, and a pressure difference transmission means for operating the valve body to open and close the flow passage based on the difference between the pressure inside the pressure transmission pipe and the pressure in the flow passage. One end of the accumulator main body is closed with a plurality of communication holes formed therein, and the refrigerant inflow pipe and the connection pipe are connected to the communication holes to communicate with the accumulator main body, and the The check valve has a direction in which the refrigerant flows out from the Akiemulator main body, and the pressure operating valve has the pressure transmission pipe inserted into the accumulator main body through an opening at the other end, and the pressure transmitting pipe is inserted into the accumulator main body through the communication hole at the end. After the pressure transmitting pipe and the refrigerant outflow pipe are attached to the Akyemulator main body with the other end opening closed in a state extending outside the main body, the pressure transmission pipe and the refrigerant outflow pipe are connected to the open end of the connecting pipe outside the Akyemulator main body. A method of manufacturing a refrigerant flow control device characterized by: