JP6844293B2 - Liquid reservoir - Google Patents

Description

The present disclosure relates to a liquid reservoir used in a refrigeration cycle.

In the refrigeration cycle, a liquid storage device called an accumulator for temporarily storing the refrigerant is provided in the refrigerant flow path between the evaporator and the compressor. The accumulator has a function of supplying a substantially gas phase refrigerant toward the compressor when the refrigeration cycle performs a heating operation. The accumulator also has the function of returning the oil circulating in the refrigeration cycle to the compressor. As an example of such an accumulator, the one described in Patent Document 1 below is known.

The accumulator described in Patent Document 1 below has a tank, a suction pipe, a resistance plate, and a holder for holding a filter. The suction pipe has a double pipe structure and is provided inside the tank. The holder is provided at the lower end of the suction pipe. The outlet of the refrigerant flowing into the suction pipe is provided above the tank. The gas-liquid two-phase refrigerant flowing into the tank goes downward in the tank while being suppressed from being in the forming state by the resistance plate. The gas-liquid separated substantially gas-phase refrigerant enters between the outer pipe and the inner pipe from above the suction pipe having a double pipe structure, flows into the inner pipe from the lower end of the suction pipe, rises, and flows out from the refrigerant outlet. The filter held at the lower end of the suction pipe by the holder is for removing sludge and the like contained in the oil when the lubricating oil flows into the suction pipe through the oil return hole formed in the holder.

Japanese Unexamined Patent Publication No. 2008-32269

In Patent Document 1, the flow path through which the refrigerant joins the suction pipe from the oil return hole contains oil along with the flow of the substantially vapor phase refrigerant flowing through the flow path between the inner pipe and the outer pipe in the suction pipe. The liquid phase refrigerant flows. Therefore, since the refrigerant density is low and the flow of the refrigerant is fast, the pressure loss when the refrigerant passes through becomes large, and the heating performance is deteriorated. In order to reduce the pressure loss, it is necessary to increase the diameter of the outflow path, which leads to an increase in the size of the accumulator.

An object of the present disclosure is to provide a liquid storage device capable of avoiding an increase in size while reducing the pressure loss of the refrigerant flow during heating.

The present disclosure is a liquid storage device used in a refrigeration cycle, in which a storage unit (808, 808B, 808C) for gas-liquid separation of a received gas-liquid two-phase refrigerant and a gas-liquid two-phase refrigerant are supplied to the storage unit. A refrigerant introduction path (801) and a refrigerant discharge path (809) for discharging the substantially gas-phase refrigerant separated by gas and liquid in the storage unit are provided. The refrigerant introduction path includes a main path (804) connected to one end (810,810B) side of the storage section and a sub-path (805,805B, 805C, 806) connected to the other end (811,811B) side of the storage section. , 806B, 806C) and branch portions (803,803B) are provided. The refrigerant discharge path is provided on one end side, and an oil recovery section (807,807B) for recovering lubricating oil from the liquid phase refrigerant stored in the storage section is provided on the secondary path.

According to the present disclosure, an oil recovery unit is provided in the sub-path, and the sub-path is provided as a path separate from the main path through which the gas phase refrigerant flows to the refrigerant discharge path. Since the route from the main path to the refrigerant discharge path does not need to consider the oil recovery function, it can be a path optimized for flowing the vapor phase refrigerant. On the other hand, the sub-path can be optimized for flowing the liquid-phase refrigerant and the lubricating oil, and the refrigerant flow can be realized by utilizing the inertia of the refrigerant, so that the diameter of the path can be reduced.

In addition, the reference numerals in parentheses described in "Means for Solving the Problem" and "Claims" indicate a correspondence relationship with "a mode for carrying out the invention" described later, and " It does not mean that "means for solving the problem" and "claims" are limited to "forms for carrying out the invention" described later.

According to the present disclosure, it is possible to provide a liquid storage device capable of avoiding an increase in size while reducing the pressure loss of the refrigerant flow during heating.

FIG. 1 is a cross-sectional view showing a vertical cross section of the liquid storage device according to the embodiment of the present disclosure. FIG. 2 is a diagram for explaining a state in which the liquid storage device shown in FIG. 1 is combined with a heat exchanger. FIG. 3 is a diagram for explaining a state in which the liquid storage device shown in FIG. 1 is combined with the heat exchanger. FIG. 4 is a cross-sectional view showing a vertical cross section of the liquid storage device according to the modified example. FIG. 5 is a cross-sectional view showing a vertical cross section of the liquid storage device according to the modified example. FIG. 6 is a cross-sectional view showing a vertical cross section of the liquid storage device according to the modified example. FIG. 7 is a cross-sectional view showing a vertical cross section of a liquid storage device as a comparative example.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

As shown in FIG. 1, the liquid storage device 36 is configured so that the refrigerant can be temporarily stored in the main body 80. A storage unit 808 is formed in the main body 80, and is configured to store the gas-liquid two-phase refrigerant and enable gas-liquid separation. The storage portion 808 is formed so as to extend from one end portion 810 to the other end portion 811. One end 810 is arranged at the upper part in the figure, and the other end 811 is arranged at the lower part in the figure. When the liquid storage device 36 is used as a part of the refrigeration cycle, one end portion 810 is arranged on the upper side in the gravity direction and the other end portion 811 is arranged on the lower side in the gravity direction.

The main body 80 includes a refrigerant introduction path 801, a pre-branch path 802, a branch section 803, a main path 804, an upstream sub-path 805, a downstream sub-path 806, an oil recovery section 807, and a refrigerant discharge path. 809 and are provided.

The refrigerant introduction path 801 is a portion that receives the refrigerant flowing through the refrigeration cycle. The refrigerant introduction path 801 allows the received gas-liquid two-phase refrigerant to flow through the pre-branch path 802. It is provided so that the flow direction of the refrigerant in the refrigerant introduction path 801 and the flow direction of the refrigerant in the pre-branch path 802 are along. The flow of the refrigerant in the refrigerant introduction path 801 and the pre-branch path 802 is along the direction from one end 810 to the other end 811.

The pre-branch path 802 is a portion connecting the refrigerant introduction path 801 and the branch portion 803. The pre-branch path 802 causes the gas-liquid two-phase refrigerant flowing from the refrigerant introduction path 801 to flow to the branch portion 803.

The branch portion 803 is a portion connecting the pre-branch route 802 with the main route 804 and the upstream sub-route 805. A part of the gas-liquid two-phase refrigerant that has flowed from the pre-branch path 802 to the branch portion 803 flows to the main path 804 side. The gas-liquid two-phase refrigerant that has flowed from the pre-branch path 802 into the branch portion 803 flows to the upstream sub-path 805 side with the inertial force that the remaining portion flows from the pre-branch path 802.

The main route 804 is a portion connecting the branch portion 803 and the storage portion 808. The main path 804 causes the gas-liquid two-phase refrigerant that has flowed from the branch portion 803 to flow into the storage portion 808. The gas-liquid two-phase refrigerant that has flowed into the storage unit 808 is gas-liquid separated, the liquid-phase refrigerant is accumulated on the other end portion 811 side below the storage unit 808, and the gas-phase refrigerant is one end portion 810 above the storage unit 808. Flow to the side. The main path 804 is a direction intersecting the direction from one end 810 to the other end 811 and extends in a substantially orthogonal direction. The flow of the refrigerant in the main path 804 is along a direction intersecting the direction from one end 810 to the other end 811.

The upstream side sub-path 805 is a portion connecting the branch portion 803 and the downstream side sub-path 806. The upstream side sub-path 805 causes the gas-liquid two-phase refrigerant flowing from the branch portion 803 to flow into the downstream side sub-path 806.

The downstream sub-path 806 is a portion connecting the upstream sub-path 805 and the refrigerant discharge path 809. The downstream sub-path 806 is along the direction from the other end 811 to the one end 810. The downstream sub-path 806 is provided so as to reach the refrigerant discharge path 809 connected from the other end 811 to the one end 810. The refrigerant flows toward the upper outlet of the downstream sub-path 806 due to the inertia of the refrigerant flowing from the upstream sub-path 805. The liquid-phase refrigerant and oil flowing through the downstream sub-passage 806 flow out from the refrigerant discharge path 809 toward the compressor (not shown) constituting the refrigeration cycle.

An oil recovery unit 807 is provided between the upstream sub-path 805 and the downstream sub-path 806. The oil recovery unit 807 collects the oil stored together with the liquid phase refrigerant in the storage unit 808, merges it with the liquid phase refrigerant flowing from the upstream side sub-path 805 to the downstream side sub-path 806, and flows it to the refrigerant discharge path 809. Has.

The refrigerant discharge path 809 is provided on one end 810 side of the storage unit 808. The vapor-phase refrigerant flowing from the storage unit 808 and the liquid-phase refrigerant and oil flowing from the downstream sub-passage 806 flow into the refrigerant discharge path 809 and flow out to the outside of the liquid storage device 36.

Subsequently, a state in which the liquid storage device 36 is combined with the heat exchanger 300 will be described with reference to FIGS. 2 and 3. FIG. 2 shows the flow of the refrigerant when the refrigeration cycle is in the heating operation. FIG. 3 shows the flow of the refrigerant when the refrigeration cycle is in the cooling operation.

The liquid storage device 36 is provided with an upper valve 40 and a lower valve 50. The upper valve 40 is configured to drive the valve body 42 by rotating the motor 41. As shown in FIG. 2, when the valve body 42 moves upward, the valve is opened and the refrigerant flows from the storage unit 808 toward the outflow flow path 13. As shown in FIG. 3, the valve is closed when the valve body 42 moves downward.

The lower valve 40 includes a refrigerant branch path 51, a valve body 52, and an urging spring 53. As shown in FIG. 2, when the refrigerant is flowing from the storage unit 808 toward the outflow flow path 13, the refrigerant does not flow into the refrigerant branch path 51, so that the valve body 52 is pushed up by the urging spring 53. The valve is closed. On the other hand, when the upper valve 40 is closed as shown in FIG. 3, the refrigerant flows to the refrigerant branch path 51 side, so that the valve body 52 is pushed down and opened.

The heat exchanger 300 includes a first heat exchanger 34, which is an upstream heat exchanger, and a second heat exchanger 35, which is a downstream heat exchanger. The first heat exchanger 34 has an inflow flow path 341, a header tank 342, a core 343, and a header tank 344.

The core 343 is a portion that exchanges heat between the refrigerant flowing inside and the air flowing outside, and has a tube through which the refrigerant passes and fins provided between the tubes.

A header tank 342 is attached to the upstream end of the core 343. A header tank 344 is attached to the downstream end of the core 343.

The header tank 342 is provided with an inflow flow path 341. The inflow flow path 12 is connected to the header tank 344. The refrigerant that has flowed in from the inflow flow path 341 flows into the core 343 from the header tank 342. The refrigerant that has flowed through the core 343 flows into the header tank 344. The refrigerant that has flowed into the header tank 344 flows out into the inflow flow path 12. The inflow flow path 12 is connected to the liquid storage device 36. The refrigerant flowing out to the inflow flow path 12 flows into the refrigerant introduction path 801 of the liquid storage device 36.

The second heat exchanger 35 includes a header tank 351, a core 352, a header tank 353, and an outflow flow path 15.

The core 352 is a portion that exchanges heat between the refrigerant flowing inside and the air flowing outside, and has a tube through which the refrigerant passes and fins provided between the tubes.

A header tank 351 is attached to the upstream end of the core 352. A header tank 353 is attached to the downstream end of the core 352.

The outflow flow path 14 is connected to the header tank 351. The outflow flow path 14 is connected to the liquid refrigerant discharge path 812 provided in the liquid storage device 36. The liquid phase refrigerant flowing out of the liquid storage device 36 flows into the header tank 351 through the outflow flow path 14. The refrigerant that has flowed in from the outflow flow path 14 flows into the core 352 from the header tank 351. The refrigerant that has flowed through the core 352 flows into the header tank 353. The refrigerant that has flowed into the header tank 353 flows out into the outflow flow path 15.

During the heating operation as shown in FIG. 2, the gas-liquid two-phase refrigerant flowing into the refrigerant introduction path 801 is split and flows from the branch portion 803 through the main path 804 into the storage section 808 for gas-liquid separation. The remaining gas-liquid two-phase refrigerant flows through the upstream subpath 805 and the downstream subpath 806. The liquid-phase refrigerant containing the gas-phase refrigerant and oil flows from the outflow flow path 13 toward the compressor through the refrigerant discharge path 809.

During the cooling operation as shown in FIG. 3, the liquid-phase refrigerant stored in the storage unit 808 flows from the liquid refrigerant discharge passage 812 through the outflow flow path 14 into the second heat exchanger 35 and is supercooled. ..

The oil recovery unit 807 is formed as a continuous passage connecting the storage unit 808 with the upstream sub-path 805 and the downstream sub-path 806. The mode is not limited to the mode described with reference to FIG. 1 as long as it is formed as a continuous passage connecting the storage unit 808 with the upstream side sub-path 805 and the downstream side sub-path 806.

With reference to FIG. 4, the liquid storage device 36A as a modified example in which the arrangement position of the oil recovery unit 807 is changed will be described. In the liquid storage device 36A, an extension subpath 805A is formed in the main body 80A. The extension sub-path 805A extends the upstream sub-path 805 to a side farther than the downstream sub-path 806 when viewed from the refrigerant introduction path 801 and the pre-branch path 802. The oil recovery unit 807A is formed as a continuous passage connecting the storage unit 808 and the extension sub-path 805A.

As described above, the liquid storage devices 36 and 36A according to the present embodiment are the liquid storage devices used in the refrigeration cycle, and are used in the storage unit 808 and the storage unit 808 for gas-liquid separation of the received gas-liquid two-phase refrigerant. It includes a refrigerant introduction path 801 for supplying a gas-liquid two-phase refrigerant and a refrigerant discharge path 809 for discharging the substantially gas-liquid separated refrigerant in the storage unit 808. The refrigerant introduction path 801 has a branch portion that branches into a main path 804 that connects to one end 810 side of the storage section 808, and an upstream side sub-path 805 and a downstream side sub-path 806 that connect to the other end portion 811 side of the storage section 808. 803 is provided. The refrigerant discharge path 809 is provided at one end on the 810 side. The upstream side sub-path 805 and the downstream side sub-path 806 are provided with an oil recovery unit 807 that recovers lubricating oil from the liquid phase refrigerant stored in the storage unit 808.

According to the present embodiment, the oil recovery unit 807 is provided in the upstream side sub-path 805 and the downstream side sub-path 806, and as a route separate from the main path 804 through which the vapor phase refrigerant flows to the refrigerant discharge path 809. It is provided. Since the route from the main path 804 to the refrigerant discharge path 809 does not need to consider the function of oil recovery, it can be a path optimized for flowing the vapor phase refrigerant. On the other hand, the upstream side sub-path 805 and the downstream side sub-path 806 can be optimized for flowing the liquid phase refrigerant and the lubricating oil, and the refrigerant flow utilizing the inertia of the refrigerant can be realized, so that the diameter of the path can be reduced. It can be realized. While the diameter of the oil return pipe in the conventional double pipe structure is required to be 32 mm, the flow path diameter of the downstream side sub-path 806 of the present embodiment is sufficient to be 5 mm in order to secure the same oil return amount. Can be confirmed by calculation and experiment. Comparing the required volume including the upstream sub-path 805, the conventional double pipe structure is about 95,000 mm ³ , whereas in this embodiment it is about 18600 mm ³ , and a volume reduction of about 80% can be achieved. it can.

Further, in the present embodiment, the oil recovery unit 807 is formed as a continuous passage connecting the storage unit 808 with the upstream sub-path 805 and the downstream sub-path 806, which are sub-paths. Further, the oil recovery unit 807A is formed as a continuous passage connecting the storage unit 808 and the extension sub-path 805A which is a sub-path. Since a continuous passage connecting the storage unit 808 and the sub-path is provided as a means for recovering the lubricating oil from the liquid phase refrigerant, any of the other end 811 side of the storage unit 808, such as the oil recovery units 807 and 807A, is provided. Communication can be provided at the position.

Further, in the present embodiment, the pre-branch path 802 for flowing the gas-liquid two-phase refrigerant into the branch portion 803 causes the gas-liquid two-phase refrigerant to flow into the branch portion 803 along the refrigerant flow direction in the upstream sub-path 805. Since the direction in which the refrigerant flows from the pre-branch path 802 to the branch portion 803 and the direction in which the refrigerant flows in the upstream sub-path 805 are configured to be along, the upstream while maintaining the inertia of the refrigerant flowing in the pre-branch path 802. It flows into the collateral path 805. Since the upstream side sub-path 805 is connected to the downstream side sub-path 806, it can flow into the downstream side sub-path 806 while maintaining the inertia of the refrigerant, and the liquid phase refrigerant and the lubricating oil can flow out.

As a comparative example, FIG. 7 shows a liquid storage device 9 that does not use the inertia of the refrigerant for oil recovery. The liquid storage device 9 is provided with a refrigerant introduction port 92 on the side wall portion of the main body 91. The gas-liquid two-phase refrigerant flowing in from the refrigerant introduction port 92 is stored in the storage unit 93 and separated into gas and liquid. A refrigerant outlet 95 is provided on the upper surface of the main body 91. The vapor phase refrigerant flows out from the refrigerant outlet 95. The storage unit 93 is provided with a tubular oil recovery unit 94. The oil recovery unit 94 is provided so as to reach the refrigerant outlet 95 from below the storage unit 93. The oil recovery unit 94 is required to suck in the liquid phase refrigerant and oil from the opening provided at the lower end and flow out from the refrigerant outlet 95. Therefore, it is necessary to narrow the opening area of the refrigerant outlet 95 to increase the flow velocity of the vapor phase refrigerant. As described above, narrowing the opening area forcibly increases the refrigerant pressure loss, which hinders the flow of the refrigerant and improves the heating performance.

On the other hand, in the present embodiment, the branch portion 803 is provided to separate the refrigerant directly going to the storage portion 808 and the refrigerant heading to the upstream side sub-path 805 and the downstream side sub-path 806 to return the oil. It is no longer necessary to forcibly increase the flow velocity of the gas phase refrigerant in order to suck up the phase refrigerant and oil. Further, since the path lengths of the upstream sub-path 805 and the downstream sub-path 806 are longer than those of the main path 804, the refrigerant is mainly distributed to the main path 804, and the upstream sub-path 805 and the downstream sub-path 806 Refrigerant flow rate decreases. In addition to recovering the liquid refrigerant from the oil recovery units 807 and 807A, the refrigerant density also increases and the pressure loss decreases. Therefore, it is possible to reduce the flow path cross-sectional area of the upstream side sub-path 805 and the downstream side sub-path 806, and it is possible to reduce the size of the liquid reservoir 36. Further, as compared with the prior art, since the entire flow rate of the refrigerant does not flow through the upstream side sub-path 805 and the downstream side sub-path 806, the flow rate through the upstream side sub-path 805 and the downstream side sub-path 806 becomes small. Therefore, the amount of oil flowing in from the oil recovery units 807 and 807A is reduced, and the opening area of the oil recovery units 807 and 807A can be widened to increase the oil recovery amount, so that it is not necessary to provide a filter.

Further, in the present embodiment, the average flow path area in the upstream sub-path 805 from the branch 803 to the other end 811 side is connected to the upstream sub-path 805 and goes from the other end 811 side to the one end 810 side. The average flow path area of the downstream sub-path 806 is configured to be small. Since the gas-liquid two-phase refrigerant flows in the upstream sub-path 805, it is preferable to increase the average flow path area in order to reduce the pressure loss, while the liquid-phase refrigerant flows in the downstream sub-path 806, so that the pressure loss is reduced. It is preferable to make the average flow area relatively small according to the amount of oil returned without worrying about it.

Further, in the present embodiment, as described with reference to FIGS. 2 and 3, it is preferable to further include a liquid refrigerant discharge path 812 that allows a substantially liquid phase refrigerant to flow out during the cooling operation of the refrigeration cycle. The liquid reservoirs 36 and 36A can function as a receiver during cooling operation and as an accumulator during heating operation.

Further, in the present embodiment, at least a part of the auxiliary pathway is formed in a tubular shape. More specifically, the upstream sub-path 805 is formed as a tubular passage in the side wall portion of the main body 80. Further, the downstream sub-path 806 is formed by arranging a tubular component in a substantially central portion of the storage portion 808. The downstream sub-route 806 corresponds to the pipe portion of the present disclosure. The downstream side sub-path 806, which is a pipe portion, is provided in the storage portion 808 so as to go from the other end portion 811 side to the one end portion 810 side.

An example in which all of the main route and the sub route are provided in the storage unit will be described with reference to FIG. In the liquid storage device 36B, a storage portion 808B is formed in the main body 80B. The storage portion 808B is formed so as to extend from one end portion 810B to the other end portion 811B.

The main body 80B includes a refrigerant introduction path 801B, a pre-branch path 802B, a branch section 803B, a main path 804B, an upstream sub-path 805B, a downstream sub-path 806B, an oil recovery section 807B, and a refrigerant discharge path. 809B and are provided. In the case of this example, the pre-branch route 802B, the branch portion 803B, the main route 804B, the upstream side sub-path 805B, and the downstream side sub-path 806B are provided inside the storage portion 808B, and the tubular members are combined. It is formed.

The refrigerant introduction path 801B causes the received gas-liquid two-phase refrigerant to flow through the pre-branch path 802B. It is provided so that the flow direction of the refrigerant in the refrigerant introduction path 801B and the flow direction of the refrigerant in the pre-branch path 802B are along. The flow of the refrigerant in the refrigerant introduction path 801B and the pre-branch path 802B flows in a direction intersecting the direction from one end 810B to the other end 811B.

The pre-branch path 802B is a portion connecting the refrigerant introduction path 801B and the branch portion 803B. The pre-branch path 802B causes the gas-liquid two-phase refrigerant flowing from the refrigerant introduction path 801B to flow to the branch portion 803B.

The branch portion 803B is a portion connecting the pre-branch route 802B with the main route 804B and the upstream sub route 805B. A part of the gas-liquid two-phase refrigerant that has flowed from the pre-branch path 802B to the branch portion 803B flows to the main path 804B side. The remaining portion of the gas-liquid two-phase refrigerant that has flowed from the pre-branch path 802B to the branch portion 803B flows to the upstream side sub-path 805B side.

The main route 804B is a portion connecting the branch portion 803B and the storage portion 808B. The gas-liquid two-phase refrigerant that has flowed into the storage section 808B is gas-liquid separated, the liquid-phase refrigerant is accumulated on the other end 811B side below the storage section 808B, and the gas-phase refrigerant is above the storage section 808B at one end 810B. Flow to the side. The main path 804B is a direction intersecting the direction from one end 810B to the other end 811B, and extends in a substantially orthogonal direction. The flow of the refrigerant in the main path 804B is along a direction intersecting the direction from one end 810B to the other end 811B.

The upstream side sub-path 805B is a portion connecting the branch portion 803B and the downstream side sub-path 806B. The upstream side sub-path 805B causes the gas-liquid two-phase refrigerant flowing from the branch portion 803B to flow into the downstream side sub-path 806B.

The downstream sub-path 806B is a portion connecting the upstream sub-path 805B and the refrigerant discharge path 809B. The downstream sub-path 806B is along the direction from the other end 811B to the one end 810B. The downstream sub-path 806B is provided so as to reach the refrigerant discharge path 809B connected from the other end 811B to the one end 810B.

An oil recovery unit 807B is provided near the lower end of the downstream sub-path 806B. The oil recovery section 807B is formed by providing a continuous passage on the side wall portion of the downstream sub-path 806B.

An example in which the storage portion and the sub-pathway are integrally formed will be described with reference to FIG. The liquid storage device 36C has a main body 80C. The main body 80C is manufactured by extrusion molding or the like so as to form the storage portion 808C, the upstream side sub-path 805C, and the downstream side sub-path 806C inside. The main path 804C is formed by drilling after extrusion molding. Therefore, the main route 804C, the upstream sub-route 805C, the downstream sub-path 806C, and the storage unit 808C are formed by a single component.

Further, the main body 80C can be divided into two along the dividing line PL in the drawing, each component can be separately formed by injection molding or the like, and the pair of components can be formed by facing each other.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

801: Refrigerant introduction path 803: Branch section 804: Main path 805: Upstream side sub-path 806: Downstream side sub-path 807: Oil recovery section

Claims (9)

A liquid storage device used in the refrigeration cycle
A storage unit (808, 808B, 808C) for gas-liquid separation of the received gas-liquid two-phase refrigerant, and
A refrigerant introduction path (801) for supplying a gas-liquid two-phase refrigerant to the storage portion, and
A refrigerant discharge passage (809) for discharging the substantially gas-phase refrigerant separated by gas and liquid in the storage portion is provided.
The refrigerant introduction path includes a main path (804) connected to one end (810,810B) side of the storage section and a sub-path (805,805B,) connected to the other end (811,811B) side of the storage section. A branch portion (803,803B) that branches into 805C, 806,806B, 806C) is provided.
The refrigerant discharge path is provided on one end side thereof, and is provided.
An oil recovery unit (807,807B) for recovering lubricating oil from the liquid phase refrigerant stored in the storage unit is provided in the sub-path .
The oil recovery unit is a liquid storage device formed as a continuous passage connecting the storage unit and the sub-pathway. A liquid storage device used in the refrigeration cycle
A storage unit (808, 808B, 808C) for gas-liquid separation of the received gas-liquid two-phase refrigerant, and
A refrigerant introduction path (801) for supplying a gas-liquid two-phase refrigerant to the storage portion, and
A refrigerant discharge passage (809) for discharging the substantially gas-phase refrigerant separated by gas and liquid in the storage portion is provided.
The refrigerant introduction path includes a main path (804) connected to one end (810,810B) side of the storage section and a sub-path (805,805B,) connected to the other end (811,811B) side of the storage section. A branch portion (803,803B) that branches into 805C, 806,806B, 806C) is provided.
The refrigerant discharge path is provided on one end side thereof, and is provided.
An oil recovery unit (807,807B) for recovering lubricating oil from the liquid phase refrigerant stored in the storage unit is provided in the sub-path .
The sub-path is an upstream sub-path (805,805B) from the branch to the other end, and a downstream sub-path connected to the upstream sub-path from the other end to the one end. Has (806,806B) and
A liquid reservoir formed so that the average flow path area in the downstream side sub-path is smaller than the average flow path area in the upstream side sub-path. The liquid storage device according to claim 1 or 2.
The pre-branch path (802) for flowing the gas-liquid two-phase refrigerant into the branch is a liquid storage device in which the gas-liquid two-phase refrigerant is poured into the branch along the direction of the refrigerant flow in the sub-path. The liquid storage device according to any one of claims 1 to 3.
Further, a liquid storage device including a liquid refrigerant discharge path (812) that allows a substantially liquid phase refrigerant to flow out when the refrigeration cycle operates in cooling. The liquid storage device according to any one of claims 1 to 4.
The subpath is a liquid reservoir in which at least a part thereof is formed in a tubular shape. The liquid storage device according to claim 5.
The sub-path is a liquid reservoir in which at least a part thereof is formed as a pipe portion by a tubular part. The liquid storage device according to claim 6.
The pipe portion is a liquid storage device provided in the storage portion so as to go from the other end side to the one end side. The liquid storage device according to any one of claims 1 to 4.
A liquid storage device in which the sub-path (805C, 806C) and the storage portion (808C) are formed of a single component. The liquid storage device according to any one of claims 1 to 4.
The sub-path and the storage portion are formed by adjoining a pair of parts formed by forming a part of the sub-path and a part of the storage portion so as to face each other.

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