JP4818154B2 - Expansion valve mechanism and flow path switching device - Google Patents

Description

  The present invention relates to an expansion valve mechanism and a flow path switching device, and more particularly to an expansion valve mechanism and a flow path switching device suitable for a vapor compression heat pump type air conditioner.

As an expansion valve mechanism installed in a conventional refrigeration cycle, a fixed throttle composed of an orifice (weir) and a capillary tube (capillary tube) and a variable throttle composed of an electronically controlled expansion valve are known.
Moreover, the invention (same as what is called "heat pump driving | operation") which is trying to acquire heating performance using a refrigerating cycle is disclosed (for example, refer patent document 1).

JP 2002-106994 A (page 4-5, FIG. 1)

  In the invention disclosed in Patent Document 1, a four-way valve is installed downstream of a compressor. During cooling, a high-pressure high-temperature refrigerant is supplied to an external heat exchanger, and then passed through a constant differential pressure valve and an orifice that are opened at a low pressure. If the pressure is high, after passing through both the differential pressure valve and orifice opened at low pressure and the constant pressure valve and orifice opened at high pressure, the internal heat exchanger is Bypass. On the other hand, at the time of heating, a high-pressure high-temperature refrigerant is supplied to the internal heat exchanger and then poured into a constant differential pressure valve and an orifice opened at high pressure. Therefore, the heating performance can be obtained.

However, the invention
(A) At the time of heating, since the high-pressure and high-temperature refrigerant flows into only one orifice, there is a problem that the flow rate cannot be controlled.
(B) Furthermore, if an electronically controlled expansion valve is installed in place of the orifice, energy saving can be improved by fine flow rate control, but on the other hand, since the number of components is large, the manufacturing cost becomes expensive. There was a problem.

  The present invention has been made to solve the above-described problems, and has a simple structure installed in a refrigeration cycle capable of heating operation (heat pump operation), and can suppress manufacturing costs at a low cost. It is possible to obtain an expansion valve mechanism capable of adjusting the flow rate and a flow path switching device suitable for the expansion valve mechanism.

A flow path switching device according to the present invention includes a fluid inlet through which a fluid flows, and a low-pressure fluid outlet and a communication outlet through which fluid flowing in from the fluid inlet can freely flow out,
A high-pressure fluid flow path comprising: a high-pressure fluid inlet communicating with the communication outlet; and a high-pressure fluid outlet through which fluid flowing in from the high-pressure fluid inlet flows out;
A slider disposed in the supply fluid flow path to open or close the communication outlet;
An urging means disposed in the supply fluid flow path and pressing the slider in the fluid inlet direction;
When the pressure of the fluid flowing in from the fluid inlet is equal to or lower than a predetermined pressure, the communication outlet is closed by the slider and the fluid flows out of the low-pressure fluid outlet, while the pressure of the fluid flowing in from the fluid inlet When the pressure exceeds a predetermined pressure, the communication outlet is opened and the fluid flows out of the low pressure fluid outlet and the communication outlet ,
The supply fluid flow path is provided with a moving fluid inlet into which a fluid for moving the slider in the fluid inlet direction flows,
When a fluid flows into the supply fluid channel from the moving fluid inlet, the low-pressure fluid outlet and the communication outlet are closed .

Therefore, since the flow path switching device according to the present invention has the function of the pressure responsive valve by the slider and the spring, the condition (trigger) for switching the flow path, that is, the threshold value of the differential pressure is set to the spring constant of the spring. Therefore, not only the structure is simplified but also the reliability of the operation is ensured .

[Embodiment 1]
(Refrigeration cycle)
FIG. 1 is a configuration diagram schematically illustrating a refrigeration cycle in which an expansion valve mechanism according to Embodiment 1 of the present invention is installed.
In FIG. 1, a refrigeration cycle 100 includes a compressor 1 that compresses refrigerant, an outdoor heat exchanger 3 and an indoor heat exchanger 5 that exchange heat between the supplied refrigerant and outside air, and the compressor 1. The four-way switching valve 2 that selectively supplies the refrigerant compressed by the refrigerant (hereinafter referred to as “high-temperature refrigerant”) to one of the outdoor heat exchanger 3 and the indoor heat exchanger 5, and expansion that depressurizes the supplied refrigerant. And a valve mechanism 4.
That is, when the room is cooled, the high-temperature refrigerant is supplied to the indoor heat exchanger 5 and used as a condenser. On the other hand, when the room is heated, high-temperature refrigerant is supplied to the expansion valve mechanism 4 via the outdoor heat exchanger 3, and refrigerant generated in the expansion valve mechanism 4 (hereinafter referred to as “low-temperature refrigerant”) is indoors. The heat exchanger 5 is supplied and used as an evaporator.
Therefore, the refrigerant flow in the right direction and the right direction in FIG. 1 is generated in the expansion valve mechanism 4.

(Expansion valve mechanism)
FIG. 2 is a configuration diagram schematically illustrating the expansion valve mechanism according to the first embodiment of the present invention.
In FIG. 2, the expansion valve mechanism 4 includes a first series 4a in which the check valve 6 is installed and a second series 4b in which the check valve 13 is installed in parallel. For convenience of explanation, it is assumed that the branch points of the two are branch points A and D, the branch point A communicates with the outdoor heat exchanger 3, and the branch point D communicates with the indoor heat exchanger 5.
The first series 4a includes a low-load capillary tube 7 and a high-load capillary tube 9 that are branched in parallel at the branch points B1 and C1, and are upstream of the high-load capillary tube 9 (the branch point B1 side, A pressure responsive valve 8 is provided on the check valve 6).
The second series 4b includes a low-load capillary 12 and a high-load capillary 10 that are arranged in parallel with each other at the branch points B2 and C2. The upstream side of the high-load capillary 10 (the branch point C2 side, The pressure responsive valve 11 is installed on the check valve 13.

(Operation of expansion valve mechanism)
Next, operation during cooling operation will be described.
In the expansion valve mechanism 4 configured as described above, during the cooling operation, the high-pressure refrigerant (high-temperature refrigerant) condensed in the outdoor heat exchanger 3 passes through the check valve 6 and flows into the first series. However, it does not flow into the second system closed by the check valve 13.
Then, the high-temperature refrigerant that has flowed in in the first series is reduced in pressure by the low-load capillary 7 (becomes a low-temperature refrigerant) and flows out toward the indoor heat exchanger 5. Here, as the operating state of the refrigeration cycle becomes a high load condition and the high pressure of the refrigeration cycle increases, the pressure difference across the low load capillary 7 increases. When a certain set value is exceeded, the pressure responsive valve 8 opens. Therefore, during the cooling operation under a high load condition, the high-temperature refrigerant flows into both the low load capillary 7 and the high load capillary 9, and the circulation flow rate of the refrigerant in the refrigeration cycle 100 increases.

Moreover, the operation | movement at the time of heating operation is demonstrated.
In the expansion valve mechanism 4 configured as described above, during the heating operation, the high-pressure refrigerant (high-temperature refrigerant) condensed in the indoor heat exchanger 5 passes through the check valve 13 and flows into the second system. However, it does not flow into the first series closed by the check valve 6.
Then, the high-temperature refrigerant that has flowed in the second series is reduced in pressure by the low-load capillary 12 (becomes a low-temperature refrigerant) and flows out toward the outdoor heat exchanger 3. Here, as the operating state of the refrigeration cycle becomes a high load condition and the high pressure of the refrigeration cycle increases, the pressure difference across the low load capillary 12 increases, so this pressure difference is relative to the pressure responsive valve 11. When a certain set value is exceeded, the pressure responsive valve 11 opens. Therefore, during heating operation under a high load condition, the high-temperature refrigerant flows into both the low load capillary 12 and the high load capillary 10, and the circulation flow rate of the refrigerant in the refrigeration cycle 100 increases.

As described above, the refrigeration cycle 100 can suppress the circulation flow rate of the refrigerant when the operation state is in a low load condition, and can increase the circulation flow rate of the refrigerant when the operation state is in a high load condition. For this reason, it is possible to prevent excessive increase of high pressure under high load conditions, deterioration of heating / cooling capacity due to insufficient refrigerant circulation flow under high load conditions, and deterioration of energy saving due to liquid compression under low load conditions. You can do both.
Moreover, since the expansion valve mechanism 4 is comprised only with machine parts, without using an electromagnetic mechanism, it can hold down manufacturing cost at a low price.
Furthermore, since the first series and the second series are arranged in parallel with each other and have the same configuration, they can cope with the bidirectional flow of the refrigerant, which is suitable for the heat pump air conditioner.

The low-load capillaries 7 and 12 and the high-load capillaries 9 and 10 are names for convenience, and the amount of reduced pressure, the flow rate, and the like can be appropriately selected. In particular, the high load capillaries 9 and 10 may be normal pipes that are not decompressed. The low load condition or the high load condition is a name for convenience, and the valve opening pressure of the pressure responsive valve can be appropriately selected independently for each heating / cooling operation.
Furthermore, although the above has shown the capillary (capillary tube) as a pressure reduction means, this invention is not limited to this, An orifice (weir) may be sufficient. In addition, a decompression means such as a capillary tube may be supplementarily disposed on one or both of the upstream side and the downstream side of the expansion valve mechanism 4.

[Embodiment 2]
(Flow path switching device)
3 and 4 schematically illustrate the flow path switching device according to the second embodiment of the present invention. FIG. 3A is a front view, FIG. 3B is a rear view, and FIG. 4 (a) and 4 (b) are cross-sectional views taken along the lines AA and BB in FIG. 3, respectively.
3 and 4, the flow path switching device 200 includes a first series 100a (arranged at AA in FIG. 3) formed inside a casing 70 that is cylindrical and has bottoms at both ends. And the second series 100b (arranged at BB in FIG. 3).

The first series 200a includes a low-pressure fluid flow path 40 including a fluid inlet 41a into which a fluid flows, and a low-pressure fluid outlet 42a and a communication outlet 43a through which the fluid flowing in from the fluid inlet 41a can freely flow out,
A high-pressure fluid flow path 50a comprising a high-pressure fluid inlet 51a communicating with the communication outlet 43a, and a high-pressure fluid outlet 52a through which the fluid flowing in from the high-pressure fluid inlet 51a flows out;
A slider 44a disposed in the low pressure fluid flow path 40a and opening or closing one or both of the low pressure fluid outlet 42a and the communication outlet 43a;
And a spring (same as the urging means) 45a that is disposed in the low-pressure fluid flow path 40a and presses the slider 44a toward the fluid inlet 41a.
The low-pressure fluid channel 40a is provided with a moving fluid inlet 46a into which a fluid for moving the slider 44a in the direction of the fluid inlet 41a flows.

Since the second series 200b has the same configuration as the first series 200a, for each member constituting the second series 200b, the reference numeral is the same, and the subscript “a” is read as “b”. Description is omitted.
That is, the second series 200a includes a low pressure fluid flow path 40b having a fluid inlet 41b, a low pressure fluid outlet 42b, a communication outlet 43b, and a moving fluid inlet 46b, and a high pressure having a high pressure fluid inlet 51b and a high pressure fluid outlet 52b. A fluid channel 50b, a slider 44b and a spring 45b disposed in the low-pressure fluid channel 40b,
have.

  The first end surface 71 of the housing 70 is formed with a fluid inlet 41a of the first series 200a, a high-pressure fluid outlet 52b and a moving fluid inlet 46b of the second series 200b. The other end face 73 of the housing 70 is formed with a high-pressure fluid outlet 52a and a moving fluid inlet 46a of the first series 200a and a fluid inlet 41b of the second series 200b. Further, a low pressure fluid outlet 42a of the first series 200a and a low pressure fluid outlet 42b of the second series 200b are formed on the side surface 72 of the housing 70.

[Embodiment 3]
(Refrigeration cycle)
FIG. 5 is a configuration diagram schematically illustrating a part of a refrigeration cycle in which an expansion valve mechanism including a flow path switching device according to Embodiment 3 of the present invention is installed. The refrigeration cycle 400 is the same as the first embodiment because the expansion valve mechanism 4 constituting the refrigeration cycle 100 in the first embodiment and the expansion valve mechanism 300 including the flow path switching device 200 are replaced. Parts are denoted by the same reference numerals, and a part of the description is omitted.

(Expansion valve mechanism)
In the expansion valve mechanism 300, the low-load capillary 7 communicates with the low-pressure fluid outlet 42a of the first series 200a of the flow path switching device 200, and the high-load capillary 9 communicates with the high-pressure fluid outlet 52a. The low-load capillary 12 communicates with the low-pressure fluid outlet 42b of the series 200b, and the high-load capillary 10 communicates with the high-pressure fluid outlet 52b.
The pipe 80 communicating with the outdoor heat exchanger 3 is branched into the outdoor pipes 81, 82, 83, 84 at the branch point A, and the pipe 90 communicating with the indoor heat exchanger 5 is branched at the branch point D. The indoor branch pipes 91, 92, 93 and 94 are branched.

The outdoor pipe 81 is connected to the fluid inlet 41a of the first series 200a, the outdoor pipe 82 is connected to the low pressure fluid outlet 42b of the second series 200b via the low load capillary 12, and the outdoor pipe 83 is connected to the second series. The outdoor piping 84 is connected to the moving fluid inlet 46b of the 200b via the high load capillary 10 and to the high pressure fluid outlet 52b of the second series 200b.
Similarly, the indoor side pipe 91 is connected to the fluid inlet 41b of the second series 200b, the indoor side pipe 92 is passed through the low load capillary 7 to the low pressure fluid outlet 42a of the first series 200a, and the indoor side pipe 93 is connected to the first line 200b. The indoor side pipe 94 is connected to the moving fluid inlet 46a of the series 200a via the high load capillary 9 and to the high pressure fluid outlet 52a of the first series 200a.

(Operation of expansion valve mechanism)
6-9 is a block diagram which illustrates typically operation | movement of the expansion valve mechanism which concerns on Embodiment 3 of this invention, Comprising: When the driving | running state of a refrigerating cycle is a low load condition at the time of heating operation, FIG. FIG. 7 shows a case where the operation state of the refrigeration cycle is a high load condition during heating operation, FIG. 8 shows a case where the operation state of the refrigeration cycle is a low load condition during cooling operation, and FIG. This is a high load condition. Hereinafter, each case will be described.

(Low load condition during heating operation)
In FIG. 6, when the operation state of the refrigeration cycle 400 is in a low load condition during heating operation, the refrigerant (high-temperature refrigerant) condensed in the indoor heat exchanger 5 is branched at a branch point D, and a part thereof It flows into the low-pressure fluid flow path 40 from the moving fluid inlet 46a of the first series 200a via the indoor side pipe 93, and moves the slider 44a to the fluid inlet 41a side. Then, since the low-pressure fluid outlet 42a and the communication outlet 43a are closed by the slider 44a, the high-temperature refrigerant does not flow into the first series 200a (same as the indoor side pipe 92 and the indoor side pipe 94), but the second series 200b ( The same flows into the indoor pipe 91).

  And the high temperature refrigerant | coolant which flowed into the indoor side piping 91 flows in into the low voltage | pressure fluid flow path 40b from the fluid inlet 41b of the 2nd series 200b. At this time, since the high-temperature refrigerant does not have sufficient pressure to push back the spring 45b, the slider 44b keeps the communication outlet 43a closed. Therefore, the high-pressure refrigerant flows out from the low-pressure fluid outlet 42 b, passes through the low-load capillary 12, is depressurized (becomes a low-temperature refrigerant), and flows into the outdoor heat exchanger 3 through the outdoor pipe 84. Take.

Even if the low-temperature refrigerant flows into the low-pressure fluid flow path 40b from the moving fluid inlet 46b via the outdoor pipe 83, the pressure is lower than that of the high-temperature refrigerant, so the slider 44b does not move, The fluid outlet 42b remains open.
Even if the low-temperature refrigerant flows into the low-pressure fluid flow path 40a of the first series 200a via the outdoor pipe 81, the pressure is lower than that of the high-temperature refrigerant, so that the slider 44b pushed by the high-pressure fluid It does not move and the low pressure fluid outlet 42a is not opened.

(High load conditions during heating operation)
In FIG. 7, when the operation state of the refrigeration cycle 400 is in a high load condition during heating operation, the refrigerant (high-temperature refrigerant) condensed in the indoor heat exchanger 5 is the first series 200a (the indoor pipe 92 and the room). It does not flow into the inner piping 94), but flows into the second series 200b (same as the indoor side piping 91).
Since the high-pressure refrigerant that has flowed into the low-pressure fluid flow path 40 of the second series 200b has sufficient pressure to push back the spring 45b, the slider 44b is pushed back to open the communication outlet 43b. Therefore, the high-temperature refrigerant flows out from both the low-pressure fluid outlet 42b and the communication outlet 43b, a part of which passes through the low-load capillary 12 and is depressurized (becomes a low-temperature refrigerant). The passage 50b passes through the high load capillary 10 and is depressurized (becomes a low-temperature refrigerant), and flows into the outdoor heat exchanger 3 via the outdoor pipe 84 or the outdoor pipe 82, respectively. .

(Low load condition during cooling operation)
In FIG. 8, when the operation state of the refrigeration cycle 400 is in a low load condition during the cooling operation, the refrigerant (high-temperature refrigerant) condensed in the outdoor heat exchanger 3 is the second series 200b (the outdoor pipe 82 and the room). It does not flow into the outer piping 84), but flows into the first series 200a (same as the outdoor piping 81).
And the high temperature refrigerant | coolant which flowed into the outdoor side piping 81 flows in into the low pressure fluid flow path 40a from the fluid inlet 41a of the 1st series 200a. At this time, since the high-temperature refrigerant does not have sufficient pressure to push back the spring 45a, the slider 44a keeps the communication outlet 43a closed. Therefore, the high-pressure refrigerant flows out from the low-pressure fluid outlet 42 a, passes through the low-load capillary 7, is depressurized (becomes a low-temperature refrigerant), and flows into the indoor heat exchanger 5 through the indoor pipe 94. Take.

(High load conditions during cooling operation)
In FIG. 9, when the operation state of the refrigeration cycle 400 is in a high load condition during cooling operation, the refrigerant (high-temperature refrigerant) condensed in the outdoor heat exchanger 3 is the second series 200b (the outdoor pipe 82 and the room). It does not flow into the outer piping 84), but flows into the first series 200a (same as the outdoor piping 81).
Since the high-temperature refrigerant that has flowed into the outdoor pipe 81 has sufficient pressure to push back the spring 45a, the slider 44a is pushed back to open the communication outlet 43a. For this reason, the high-temperature refrigerant flows out from both the low-pressure fluid outlet 42a and the communication outlet 43a, a part of which passes through the low-load capillary 7 and is depressurized (becomes a low-temperature refrigerant). A path is taken through the high-load capillary 9 via the path 50a and decompressed (becomes a low-temperature refrigerant), and flows into the indoor heat exchanger 5 via the indoor pipe 94 or the indoor pipe 92, respectively. .

As described above, the expansion valve mechanism 300 is configured such that the functions of the check valve and the pressure responsive valve are accommodated in a single housing, so that the manufacturing cost is low and the space saving is excellent, and the refrigeration cycle is performed. The refrigerant flow rate of the throttle portion can be adjusted according to the operating state.
Further, since the function of the pressure responsive valve is constituted by the slider and the spring, the condition for switching the flow path (trigger), that is, the threshold of the differential pressure can be set by the spring constant of the spring and the stroke of the slider. Therefore, not only the structure is simplified, but also the reliability of operation is ensured.
In addition, since the portion for performing the restriction and the portion for performing the flow path switching are separated, there is a feature that the circulation amount of the refrigerant can be determined only by the specifications of the capillary tube, and the design can be easily performed. it can.

In the above, a capillary tube (capillary tube) is shown as the pressure reducing means, but the present invention is not limited to this, and an orifice (weir) may be used.
Moreover, you may form the 1st series 100a and the 2nd series 100b which comprise the flow-path switching apparatus 200 in a respectively separate housing | casing. Furthermore, the low-pressure fluid flow path 40a and the high-pressure fluid flow path 50a are arranged separately from each other, and the communication outlet 43a of the low-pressure fluid flow path 40a and the high-pressure fluid inlet 51a of the high-pressure fluid flow path 50a are communicated by a predetermined communication pipe. (The same applies to the low-pressure fluid channel 40b and the high-pressure fluid channel 50b).

As described above, the expansion valve mechanism of the present invention can be executed while appropriately switching between the cooling operation and the heating operation while keeping the manufacturing cost low with a simple configuration, and thus is installed in various cooling heating machines and refrigeration heating machines. It can be widely used as an expansion valve.
Moreover, since the flow rate switching device of the present invention can adjust the flow rate according to the pressure of the flowing refrigerant, it can be widely used as a flow channel switching device installed in various fluid machines.

The block diagram of the refrigerating cycle in which the expansion valve mechanism which concerns on Embodiment 1 of this invention was installed. The block diagram which illustrates typically the expansion valve mechanism which concerns on Embodiment 1 of this invention. The front view etc. which explain typically the channel change device concerning Embodiment 2 of the present invention. Sectional drawing of the side view explaining the flow-path switching apparatus shown in FIG. 3 typically. The block diagram of the refrigerating cycle in which the expansion valve mechanism which concerns on Embodiment 1 of this invention was installed. The block diagram explaining operation | movement of the expansion valve mechanism shown in FIG. 5 (low load heating). The block diagram explaining operation | movement of the expansion valve mechanism shown in FIG. 5 (high load heating). The block diagram explaining operation | movement of the expansion valve mechanism shown in FIG. 5 (low load cooling). The block diagram explaining operation | movement of the expansion valve mechanism shown in FIG. 5 (high load cooling).

Explanation of symbols

  1: compressor, 2: four-way switching valve, 3: outdoor heat exchanger, 4: expansion valve mechanism, 5: indoor heat exchanger, 6: check valve (first series), 7: low load capillary (First series), 8: pressure responsive valve (first series), 9: capillary tube for high load (first series), 10: capillary tube for high load (second series), 11: pressure responsive valve (second series) ), 12: capillary tube for low load (second series), 13: check valve (second series), 40a: low pressure fluid flow path, 41a: fluid inlet, 42a: low pressure fluid outlet, 43a: communication outlet, 44a: Slider, 45a: Spring, 46a: Moving fluid inlet, 50a: High pressure fluid flow path, 51a: High pressure fluid inlet, 52a: High pressure fluid outlet, 70: Housing, 71: End face, 72: Side face, 73: End face, 80: Piping, 81: outdoor piping, 82: outdoor piping, 83: outdoor piping, 84: outdoor piping, 90: piping 91: indoor piping, 92: indoor piping, 93: indoor piping, 94: indoor piping, 100: refrigeration cycle, 100a: first series of refrigeration cycle, 100b: second series of refrigeration cycle, 200: flow Road switching device, 200a: first series of flow switching devices, 200b: second series of flow switching devices, 300: expansion valve mechanism, 400: refrigeration cycle, A: branch point, B1: branch point, B2: branch Point, C1: branch point, C2: branch point, D: branch point.

Claims (3)

A supply fluid flow path comprising: a fluid inlet through which fluid flows; and a low-pressure fluid outlet and a communication outlet through which fluid flowing from the fluid inlet can freely flow out;
A high-pressure fluid flow path comprising: a high-pressure fluid inlet communicating with the communication outlet; and a high-pressure fluid outlet through which fluid flowing in from the high-pressure fluid inlet flows out;
A slider disposed in the supply fluid flow path to open or close the communication outlet;
An urging means disposed in the supply fluid flow path and pressing the slider in the fluid inlet direction;
When the pressure of the fluid flowing in from the fluid inlet is equal to or lower than a predetermined pressure, the communication outlet is closed by the slider and the fluid flows out of the low-pressure fluid outlet, while the pressure of the fluid flowing in from the fluid inlet When the pressure exceeds a predetermined pressure, the communication outlet is opened and the fluid flows out of the low pressure fluid outlet and the communication outlet ,
The supply fluid flow path is provided with a moving fluid inlet into which a fluid for moving the slider in the fluid inlet direction flows,
The flow path switching device , wherein when a fluid flows into the supply fluid flow path from the moving fluid inlet, the low pressure fluid outlet and the communication outlet are closed . The flow path switching device according to claim 1, wherein the supply fluid flow path and the high-pressure fluid flow path are formed in a common housing. The flow according to claim 3 or 4, wherein the first series in which the flow path switching device according to claim 1 or 2 is flowed only in one direction and the high-temperature refrigerant is caused to flow in a direction opposite to the first series. A second system in which a path switching device is installed, and an expansion valve mechanism for decompressing the high-temperature refrigerant,
A first supply pipe in which the first series communicates with a supply fluid inlet of the flow path switching device and a low pressure fluid outlet of the flow path switching device and a first low load decompression means is disposed. A first high-pressure pipe in communication with a low-pressure pipe, a high-pressure fluid outlet of the flow path switching device and a first high-pressure load decompression means, and a first moving pipe in communication with the mobile fluid inlet of the flow path switching device And comprising
A second supply line in which the second system communicates with a supply fluid inlet of the flow path switching device, and a second low load decompression means is disposed in communication with the low pressure fluid outlet of the flow path switching device. A low-pressure pipe, a second high-pressure pipe in communication with the high-pressure fluid outlet of the flow path switching device and a second high-pressure load decompression means, and a second moving pipe in communication with the mobile fluid inlet of the flow path switching device And comprising
The first supply pipe, the second low-pressure pipe, the second high-pressure pipe, and the second moving pipe communicate with each other;
The second supply pipe, the first low-pressure pipe, the first high-pressure pipe, and the first moving pipe are in communication with each other.

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