JPS5997463A - Valve gear for refrigeration cycle - 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] [Technical Field of the Invention] What has not yet been invented is a metal-driven compressor such as a refrigerator. [Technical background of the invention and its problems] For this type of refrigeration cycle/L/l:c compressor,
It consists of a condenser, a capillary tube, and an eno (porator) connected in order. In this case, when the inside of the refrigerator is cooled to a predetermined temperature and the compressor stops operating, the hot casing on the condenser side gradually flows into the evaporator. There was a problem in that the compressor restarted operation within a relatively short time after the inflow into the air, resulting in increased power consumption.In order to prevent this,
In the rotary compressor, as shown in Figure 1, there is a VC between the capacitor A and the capillary tube B.
A solenoid valve Oi is provided, and when the rotary compressor D is stopped, the solenoid valve C is energized and closed, and a check valve F2 is provided between the rotary compressor D and the evaporator E, and the operation is stopped. Sometimes, there is a system that prevents hot gas from the capacitor section from flowing into the evaporator section, but in this case, the solenoid valve C is not energized while the operation is stopped, resulting in wasted power.

Therefore, in recent years, a pressure-responsive valve device Gi has been installed in place of the conventional solenoid valve C, as shown in FIG. The valve device G is operated to close due to the increase in the internal pressure of the pipe H due to the stoppage of operation of the rotary compressor D, and the air flows into the evaporator E (
7) It is considered to prevent the inflow of hot residue. However, in the configuration shown in FIG. 2, the check valve F and the valve device G must be provided separately, and ICT is required to connect the rotary compressor D, the check valve F, and the valve device G.
There is a problem that the number of parts increases due to the need for a joint K (H).Also, the pipe connection point (second Figure 4
There are four more locations than the conventional configuration shown in FIG. 1, as shown in A to H, and there is a problem in that the pipe connection work requires a lot of effort.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances.The purpose of the present invention is to reduce the number of parts and pipe connection points by brazing K in a refrigeration cycle equipped with a rotary compressor without using a solenoid valve. RC provides a valve device for a refrigeration cycle that can prevent hot gas from flowing into an evaporator.

[Summary of the invention]

The present invention has a differential pressure valve section and a check valve section on one side and the other side of the valve case, respectively, and the outlet side rC of the condenser in the differential pressure valve section.
A first inlet connected to the inlet and a first outlet connected to the inlet side of the evaporator are provided, and a pressure responsive body is provided so as to isolate the differential pressure valve side from the check valve side. A valve body for differential pressure operation is fully connected to the pressure responsive body, a check valve body is disposed within the check valve portion, and a check valve body is provided with a valve body on the opposite side of the differential pressure valve portion in the check valve portion. a second inlet located and connected to the outlet side of the evaporator, and a second inlet located between the pressure responsive body and the check valve body and connected to the inlet side of the rotary compressor; The entire outflow port is formed, and the pressure-responsive body is displaced by the internal pressure difference between the differential pressure valve part and the check valve part, and the pressure-responsive body is displaced by the differential pressure operating valve body to open the first inflow port and the first outflow port. When the valve is fully opened and closed, the check valve body closes the space between the second outlet and the second inlet by a reverse flow of refrigerant from the second outlet to the second inlet. It is also possible to eliminate the need for joints, thereby achieving a total reduction in both the number of parts and the connection points for brazed VC and C pipes.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 6 to 5. First, in FIG. 3, 1 is a rotary compressor, and a valve device 2 is connected to the compressor 1.
Through the capacitor 3° dryer 4. Capillary tube5. The evaporator 6 for the refrigerator compartment and the evaporator 7 for the freezer compartment are connected in the same order. Reference numeral 8 denotes a flow path switching solenoid valve, which is used to flow the refrigerant to both the evaporators 6 and 7 of the refrigerator and freezer compartments through the capillary tube 5t depending on the temperature of the refrigerator compartment, and to flow the refrigerant to the evaporators 6 and 7 of the refrigerator compartment and the freezer compartment depending on the temperature of the refrigerator compartment. The function is to switch between flowing VC and RC only in the evaporator 7 for the freezer compartment. Next, in FIG. 4 rc showing the specific structure of the valve device 112, 10 is a cylindrical valve case with both ends closed, and on the other hand, what is the total differential pressure valve part 11 on the left side in the figure?
On the other hand, the right side in the drawing is the check valve section 12. The circumferential wall and end wall rc of the differential pressure valve section 11 are fitted with short connecting pipes 13 and 14, respectively.
An outflow port 16 is formed. A connecting pipe 17 connected to the outlet of the dryer 4 is connected to the connecting pipe 13 of the first inlet 15 by brazing. , to the connecting pipe 14 of the first outlet 16 is a connecting pipe 1 connected to the inlet of the cavity free tube 5 and the inlet of the solenoid valve 8.
8 are also connected by brazing rc. Reference numeral 19 denotes an annular mounting seat fitted and fixed inside the central part of the valve case 1o, and 20 a bellows, which is a pressure-responsive body whose left end is sealed with a cap 21;
o is housed in the differential pressure valve part 11, and the right end is the mounting seat 1.
9rc solid layered. The inside of the valve case 10 includes the bellows 20rC, the first valve chamber 2 on the side of the differential pressure valve section 11,
2 and the second valve chamber 23 on the side of the check valve section 12 in a liquid-tight and air-tight manner, and the bellows 2017'3 is communicated with the inside of the second valve chamber 23. 24 is an fc spherical differential pressure operating valve body attached to the bellows x2om cap 21, which closes and opens the first outlet 16 as the bellows 2o expands and contracts; Second
When the internal pressures of the valve chambers 22 and 23 are substantially equal, VC expands by its own elastic force and closes the V-first outlet 16 by the differential pressure operating valve body 24. On the other hand, 25 is a valve seat fitted and fixed inside the right end portion of the check valve portion 12, and a central portion tct:c valve port 26 is formed to pass through in the left-right direction, and the left end surface is conical. It is formed as a recessed seat surface 25&. Reference numeral 27 denotes a check valve body which is movable and housed in the check valve section 12 in the left and right direction.The right end surface is formed as a conical protruding surface 27&, and the left end surface rC is formed as a groove 27b.
is formed.

In addition, 28 is an annular stopper fitted and fixed in the check valve part 12, and is located at the leftward movement limit position tii' of the check valve body 27.
This is for a friend who has regulations. 29 is the second inlet;
This is formed so that the valve hole 261C of the valve seat 25 communicates with a portion of the check valve portion 12 opposite to the differential pressure valve portion 11, that is, an end wall of the check valve portion 12. has been done. A short connecting pipe 30 is fitted into the inlet 29 of @2, and a suction pipe 31 connected to the outlet VC of the freezer compartment evaporator 7 is connected to the brazing Vc. It is connected. Reference numeral 62 denotes a second outflow port, which is formed in the peripheral wall of the reverse valve portion 12 between the bellows 2'o and the check valve body 27. And this second
A short connecting pipe 33 is fitted into the outlet 32 of the
A connecting pipe 34 connected to the intake port of the rotary compressor 1 is connected to this connecting pipe 53 by brazing.

In the valve device 21C configured as described above, before the rotary compressor 1 starts operating, the differential pressure operating valve body 24 is closed to the first outflow 0.16'', and the non-return The valve body 27 closes the second inlet port 29. Now, when the temperature inside the refrigerator rises above a predetermined temperature, the rotary compressor 1
When the operation starts, the pressure inside the connecting pipe 34 decreases,
The pressure on the condenser 2 side increases, and accordingly, the pressure in the first valve chamber 22 decreases and the pressure in the second valve chamber 23 increases. As a result, the check valve body 27 moves to the left of F by the refrigerant on the high-pressure side of both evaporators 6 and 7, opening the valve port 26 of the valve seat 25 and the second inlet port 29. , ma'fc first and second valve chambers 22 and 2
When the pressure difference in the bellows 20rc exceeds a predetermined value, the elastic force of the bellows 20rc itself also receives a large compressive force and contracts, causing the differential pressure actuating valve element 24 to separate from the first outlet 16. (See Figure 5). Then, it is compressed by a rotary compressor 1, liquefied by a condenser 3, and then cooled down by a dryer 4. First valve chamber 22. It flows into both the evaporators 6 and 7 of the refrigerator and freezer compartments through the cavitary tubes 5 and 7, evaporates there, and is sucked into the rotary refrigerator 1rC again through the second valve chamber 23t. Ru. So. The inside of the refrigerator compartment is cooled to a predetermined temperature or below.
When the gas refrigerant is caused to flow only through the refrigeration evaporator 7 by the switching action of the electromagnetic valve 8 and the freezing chamber is also cooled to a predetermined temperature or lower, the rotary compressor 1 is stopped. Then, the high-pressure gas refrigerant on the condenser 3 side flows back into the second valve chamber 23 through the rotary compressor 1 and the connecting pipe 34'. Therefore, in the second valve chamber 23, the refrigerant flows backward from the second outlet 3.2 side toward the second inlet 29, so that the check/use valve stop 27 is moved toward the right rC. Move valve seat 25
The valve port 26 and therefore the second inlet port 29 are closed. Due to the blockage of the second inlet 29, the pressure within the second valve chamber 23 rises rapidly and becomes approximately equal to the pressure within the condenser 3. On the other hand, since the first valve chamber 22 communicates with the condenser 6 via the first inlet 15, the first and second valve chambers 2
2 and 23 becomes small, and as a result, the bellows 20 expands by its own elastic force, and the differential pressure actuating valve body 24 V
C to close the first outlet 16 (see FIG. 4).

When the operation of the rotary compressor 1 is stopped in this way, the differential pressure operating valve body 24 closes the first outlet 16 and the check valve body 27 closes the second inlet 29, so that the condenser 6 The hot gas inside the evaporators 6 and 7 can be prevented from flowing into both evaporators 6 and Z, so the evaporators 6 and 7 will not be heated by the hot gas while the operation is stopped, which will lengthen the time when the linked shafts are stopped, resulting in power savings. can be achieved. Moreover, since the valve device 2 is of a pressure-responsive type, there is no unnecessary power consumption, which is different from conventional electromagnetic valves, and further power savings can be achieved.

Further, the valve device 2 has a form in which the valve device G and the check valve F shown in FIG. The pressure of the refrigerant flowing back into the VC second valve chamber 23 when the operation is stopped acts on the bellows 20 at the same time, so that the The single-shaped pipe joint is no longer required, and the number of parts is reduced in general. Moreover, the number of brazed pipe connection points related to the valve device 2 is reduced to four, as shown by Wl to W4 in FIG. It's half that compared to other things.

Incidentally, in the above embodiment, the entire pressure-responsive body 201c is configured as an extension, but a diaphragm may be used instead. The invention is not limited to the embodiments described above and shown in the drawings; for example, a capillary tube may be additionally provided between the dryer 4 and the first inlet 15 of the valve device 2. You can make various changes to it without departing from its gist.

〔Effect of the invention〕

As is clear from the above description, the present invention has a configuration in which differential pressure valves and backflow valves are fully installed in - valve cases in soil that can completely prevent hot gas from flowing into the evaporator without consuming all electricity. As a result, the number of parts is reduced and the number of locations where pipes are connected by brazing is also reduced, resulting in excellent effects such as contributing to cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a conventional refrigeration cycle diagram, Fig. 2 is a refrigeration cycle IV diagram showing an improved configuration of the conventional refrigeration cycle, Figs. figure,
4 and 5 are enlarged sectional views of the valve device shown in different states, respectively. 11' in m! Rotary compressor, 2 is a valve device, 3
is a capacitor, 51S[, capillary tube, 6゜7
10 is a valve case, 11 is a differential pressure valve part, 12 is a check valve part, 15 is a first inlet, 16 is a first outlet, 20 is a bellows (pressure 24 is a valve body for differential pressure operation, 27 is a check valve body, 29
62 is the second inlet, and 62 is the outlet of @2. Figure 1 Figure 2 Figure Δ 13 Figure 4 Figure 5 Figure 11 1t

Claims (1)

[Claims] 1. In a refrigeration cycle equipped with a rotary compressor and configured by sequential VC connection of a condenser, a capillary tube, and an evaporator to the rotary compressor, one side and the other side of the valve case are used as a differential pressure valve part and a check valve part, respectively. , the differential pressure valve section is provided with a first inlet connected to the outlet side of the condenser and a first outlet connected to the inlet side of the evaporator, and the differential pressure valve section side is connected to the check valve section side. a pressure-responsive body is provided in a manner isolated from the pressure-responsive body, and a differential pressure operating valve body is connected to the pressure-responsive body; (11) the check valve body is disposed within the check valve portion; The check valve body is located on the opposite side of the differential pressure valve section and connected to the outlet side of the evaporator. A second inlet is formed, and a second outlet is formed between the pressure responsive body and the check valve body and connected to the suction port side of the rotary compressor, and the pressure responsive body is displaced by the internal pressure difference between the differential pressure valve section and the check valve section, and the differential pressure operating valve body opens and closes between the first inlet and the first outlet, and the check valve 9. A valve device for a refrigeration cycle, in which a valve body is configured to block a gap between the refrigerant from the second outlet to the second inlet to prevent the refrigerant from flowing backwards.