JP2008241088A - Accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accumulator capable of sucking smoothly oil in from an oil staying initial stage, while compactifying a pressure container. <P>SOLUTION: This accumulator is provided with the pressure container 2 having an inflow port 7 for making a gas-liquid two-phase refrigerant flow in, and a discharge port 8 for discharging a gaseous refrigerant, in its upper part, and a refrigerant discharge member 3 stored in the pressure container 2, and is formed with an inner flow channel 10 and an outer flow channel 11 formed vertically penetratedly in the refrigerant discharge member 3, an upper part 10a of the inner flow channel 10 is connected to communicate with the discharge port 8, an upper part 11a of the outer flow channel 11 is connected to communicate with an inside of the pressure container 2, a lower part 10b of the inner flow channel 10 is connected to communicate with a lower part 11b of the outer flow channel 11 via an adaptor member 12, a prescribed clearance W1 is provided between a bottom part of the pressure container 2 and a bottom part of the adaptor member 12, and an oil suction port 12b is provided in the bottom part of the adaptor member 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an accumulator.

2. Description of the Related Art Conventionally, an accumulator technique in which gas-liquid two-phase refrigerant that has flowed into a pressure-resistant container is stored and separated into gas and liquid, and then the gas refrigerant is discharged out of the container through a refrigerant outflow member is known ( Patent Document 1).
JP 2002-130871 A

  However, in the conventional invention, when the refrigerant outflow member is constituted by a substantially U-shaped refrigerant outflow pipe, there is a problem that the pressure vessel becomes large in diameter.

  On the other hand, when the refrigerant outflow member is composed of a cylindrical member and a refrigerant outflow pipe, the cylindrical member is fixed to the bottom of the pressure vessel, or the refrigerant outflow pipe is disposed through the bottom of the pressure vessel. In addition, it is necessary to provide an oil suction port for the lubricating oil of the compressor that circulates in the refrigeration cycle on the side of the cylindrical member. As a result, the oil cannot be sucked until the oil has accumulated to some extent, or both oil and liquid refrigerant are sucked into the oil There was a risk of inhalation from the mouth.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an accumulator capable of smoothly sucking oil from an initial stage where oil is accumulated while realizing a compact pressure vessel. That is.

  According to the first aspect of the present invention, there is provided a pressure-resistant container having an inlet for allowing a gas-liquid two-phase refrigerant to flow into the upper part, a discharge port for discharging a gaseous refrigerant, and a refrigerant discharge member accommodated in the pressure-resistant container. And forming an inner passage and an outer passage that are vertically formed through the refrigerant discharge member. The upper portion of the inner passage communicates with the discharge port, while the upper portion of the outer passage communicates with the pressure vessel. The lower part of the inner passage communicates with the lower part of the outer passage through an adapter member, and a predetermined gap is provided between the bottom of the pressure vessel and the bottom of the adapter member, and an oil suction port is provided at the bottom of the adapter member. It is provided.

  In the first aspect of the present invention, a pressure vessel having an inlet for allowing the gas-liquid two-phase refrigerant to flow into the upper portion, a discharge port for discharging the gas refrigerant, and the refrigerant accommodated in the pressure vessel. An internal passage and an external passage formed vertically through the refrigerant discharge member. The upper portion of the inner passage communicates with the discharge port, and the upper portion of the outer passage communicates with the pressure vessel. The lower portion of the inner passage communicates with the lower portion of the outer passage through an adapter member, and a predetermined gap is provided between the bottom portion of the pressure-resistant container and the bottom portion of the adapter member, and oil is provided at the bottom portion of the adapter member. Since the suction port is provided, the pressure container can be made compact and the oil can be smoothly sucked from the initial stage where the oil is accumulated.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
1 is a cross-sectional view showing an accumulator according to Embodiment 1 of the present invention, FIG. 2 is an end view taken along line S2-S2 of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the accumulator according to Embodiment 1 near the bottom of the pressure vessel. FIG. 4 is a diagram illustrating a refrigeration cycle in which the accumulator of the first embodiment is employed.

First, the overall configuration will be described.
As shown in FIG. 1, the accumulator 1 according to the first embodiment includes a pressure-resistant container 2 and a refrigerant discharge member 3 accommodated in the pressure-resistant container 2.

  The pressure vessel 2 includes a cylindrical tubular portion 4, an upper closed portion 5 fixed by welding, brazing, etc. outside the figure in a state of being fitted inside the upper portion of the tubular portion 4, and the tubular portion 4 and a lower closing portion 6 fixed by welding, brazing, etc. (not shown), and these three members are made of metal, for example, aluminum.

An inflow port 7 is formed through the upper portion of the tubular portion 4, and a female screw groove 7 a is formed in the inflow port 7 for connection in a state where a connection pipe on the evaporator A 5 side described later is in communication. ing.
A discharge port 8 is formed through the central position of the upper closing portion 5, and a female screw groove for connecting to the discharge port 8 in a state where a connection pipe on the side of the internal heat exchanger A <b> 3 to be described later is connected. 8a is formed.
A concave portion 9 is formed at the center position of the lower blocking portion 6 so as to be recessed downward.

The refrigerant discharge member 3 is integrally formed of resin, and is provided with an inner passage 10 and an outer passage 11 penetratingly formed in the vertical direction, and a resin adapter member 12 is connected to the lower portion thereof.
Alternatively, the coolant discharge member 13 may be integrally formed by extrusion molding of aluminum or the like, while the adapter member 12 may be formed of the same material by press molding, and both of them may be brazed and press-fitted.

In addition, as shown in FIG. 2, the inner passage 10 of the first embodiment is arranged at the center position of the refrigerant discharge member 3, while the outer passage 11 is divided into two by the pillar portions of the two pillar portions 13. In this state, it is disposed outside the inner passage 10.
The upper outer periphery of the inner passage 10 is fixed by welding or the like not shown in the figure while being fitted in a fitting groove 8b formed facing the discharge port 8 of the upper closing portion 5, whereby the refrigerant discharge member 3 is fixed. While being fixedly supported, the upper portion 10 a of the inner passage 10 is communicated with the discharge port 8.
On the other hand, the upper part 11 a of the outer passage 11 is communicated with the pressure-resistant vessel 2 at a position higher than the inlet 7.

  As shown in FIG. 3, the adapter member 12 is formed in a substantially bottomed cylindrical shape, and is fixed by an adhesive or the like not shown in the state in which the upper portion is fitted to the lower outer periphery of the outer passage 11. Thus, the lower portion 10b of the inner passage 10 and the lower portion 11b of the outer passage 11 are communicated with each other.

  In addition, a bulging portion 12a bulging upward in a mountain shape toward the center of the inner passage 10 is formed at the bottom of the adapter member 12, and the top of the bulging portion 12a has a predetermined diameter. An oil inlet 12b is provided.

  Furthermore, a predetermined gap W <b> 1 is formed between the adapter member 12 and the bottom of the pressure vessel, specifically, between the adapter member 12 and the recess 9 of the lower closing portion 6.

  Therefore, since the adapter member 12 is configured separately from the refrigerant discharge member 3, the refrigerant discharge member 3 is changed by changing a connection allowance with the refrigerant discharge member 3 (hereinafter referred to as a connection allowance for the adapter member 12). The predetermined gap W1 can be easily changed without changing the design.

Next, the operation will be described.
As shown in FIG. 4, the accumulator 1 configured as described above is connected to a general refrigeration cycle for vehicle air conditioning in which a compressor A1, a condenser A2, an internal heat exchanger A3, an expansion valve A4, and an evaporator A5 are connected. Adopted.
Further, the refrigeration cycle of Example 1 is a so-called supercritical vapor compression refrigeration cycle in which carbon dioxide is used as a refrigerant and the high pressure side is in a supercritical region (for example, refrigerant temperature: 30 ° C. or higher, refrigerant pressure: 7.4 MPa or higher). Oil used for driving the compressor A1 circulates together with the refrigerant.

The compressor A1 is driven by a driving device such as an engine, and compresses the refrigerant to the supercritical region.
The condenser A2 (external heat exchanger) cools the gaseous refrigerant discharged from the compressor A1.
The internal heat exchanger A3 exchanges heat between the relatively low-temperature refrigerant sent from the accumulator 1 to the compressor A1 and the refrigerant sent from the condenser A2 to the expansion valve A4 to improve the heat exchange rate.
The expansion valve A4 depressurizes the refrigerant sent from the capacitor A2.
The evaporator A5 absorbs heat from the refrigerant that has been decompressed through the expansion valve A4 and the air that passes around the refrigerant passage, cools the air, and evaporates the refrigerant.

  The accumulator 1 separates the gas-liquid mixed refrigerant containing the liquid refrigerant that could not be evaporated in the evaporator A5 into gas and liquid and sends the gas refrigerant to the internal heat exchanger A4, while storing the liquid refrigerant. is there.

Hereinafter, the operation of the accumulator 1 will be described in detail.
First, the gas-liquid two-phase refrigerant that has flowed into the pressure-resistant container 2 from the connection pipe on the evaporator A5 side accumulates at the bottom of the pressure-resistant container 2, and then gas-liquid separates.
At this time, as shown in FIG. 3, oil 14 having a specific gravity larger than that of the refrigerant is stored in a layer below the liquid refrigerant 15 at the bottom of the pressure-resistant container 2.
Accordingly, as the oil 14 goes downward, the liquid refrigerant 15 is less mixed and the concentration becomes higher.

Further, the gas refrigerant separated from the gas and liquid and collected in the upper portion of the pressure vessel 2 is connected to the internal heat exchanger A3 connected to the discharge port 8 from the upper portion 11a of the outer passage 11 through the adapter member 12 and the inner passage 10. Discharged into the tube.
At this time, as shown in FIG. 3, the oil 14 (solid line) is generated by the intake pressure of the gaseous refrigerant (shown by broken line arrows) guided from the lower portion 11 b of the outer passage 11 to the inner passage 10 along the bulging portion 12 a of the adapter member 12. (Shown by an arrow) can be sucked from the oil suction port 12b and smoothly discharged together with the gaseous refrigerant.

  Depending on the operating condition of the refrigeration cycle, the refrigerant may completely evaporate on the evaporator A5 side. At this time, the gaseous refrigerant flows into the heat-resistant container 2, and only the oil 14 is collected at the bottom of the pressure-resistant container. It will be.

  Here, in the conventional invention, there is a possibility that the oil cannot be sucked until the oil is accumulated to some extent or that both the oil and the liquid refrigerant are sucked from the oil suction port.

  On the other hand, in the accumulator 1 of the first embodiment, since the oil suction port 12b is provided at the bottom of the adapter member 12, for example, when the gas-liquid two-phase refrigerant vigorously flows into the heat-resistant container 2, or in the accumulator Even when 1 is shaken due to vehicle vibration or resonance of the compressor A 1, there is no possibility that liquid refrigerant is mixed into the oil 14, and high-concentration oil 14 can be sucked.

  Further, the oil 14 can be sucked from the initial stage where the oil 14 is accumulated, and thus the oil 14 can be stably sent to the compressor A1.

  Moreover, since it can attract | suck from near the bottom part of the heat-resistant container 2, a refrigerating cycle can be drive | operated even with a small oil amount.

  Furthermore, since the amount of the oil 14 and the liquid refrigerant 15 collected at the bottom of the heat-resistant container 2 varies depending on the operation state of the refrigeration cycle and each product, the vertical length of the heat-resistant container 2 varies depending on the product. As described above, the predetermined gap W1 can be changed only by changing the connection allowance of the adapter member 12, and the heat-resistant container 2 having various vertical lengths can be handled without changing the design of the refrigerant discharge member 3.

Next, the effect will be described.
As described above, in the accumulator 1 according to the first embodiment, the pressure vessel 2 having the inlet 7 through which the gas-liquid two-phase refrigerant flows in, the outlet 8 through which the gas refrigerant is discharged, and the pressure resistance. A refrigerant discharge member 3 accommodated in the container 2 is provided, and an inner passage 10 and an outer passage 11 which are formed through the refrigerant discharge member 3 in the vertical direction are formed, and the upper portion 10a of the inner passage 10 is communicated with the discharge port 8. On the other hand, the upper portion 11a of the outer passage 11 communicates with the pressure vessel 2, the lower portion 10b of the inner passage 10 communicates with the lower portion 11b of the outer passage 11 via the adapter member 12, and the bottom portion of the pressure vessel 2 and the adapter member 12 communicate. Since a predetermined gap W1 is provided between the bottom of the adapter member 12 and an oil suction port 12b is provided at the bottom of the adapter member 12, the pressure container 2 can be made compact, and the oil 14 can be supplied from the initial stage where the oil 14 is accumulated. It can be sucked into the Meuse.

  Moreover, since it can attract | suck from near the bottom part of the heat-resistant container 2, a refrigerating cycle can be drive | operated even with a small oil amount.

  Further, the predetermined gap W1 can be changed only by changing the connection allowance between the lower portion 11b of the outer passage 11 and the adapter member 12, and the heat-dissipating container 2 having various vertical lengths can be changed without changing the design of the refrigerant discharge member 3. Yes.

  In addition, since the inner passage 10 and the outer passage 11 are formed in the refrigerant discharge member 3, a fixing bracket or the like is not required as compared with the case where they are formed separately, and the diameter size of the pressure vessel 2 can be reduced and the size can be reduced. Can contribute.

  In addition, since a bulging portion 12a bulging upward toward the center of the inner passage 10 is formed at the bottom of the adapter member 12, an oil suction port 12b is provided at the top of the bulging portion 12a. The oil 14 can be sucked from the oil suction port 12b using the intake pressure of the gas refrigerant flowing into the inner passage 10 along the outlet 12a, and the oil 14 can be sucked smoothly.

Example 2 will be described below.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, the description thereof will be omitted, and only differences will be described in detail.

  FIG. 5 is a sectional view showing an accumulator according to a second embodiment of the present invention, and FIG. 6 is an end view taken along line S6-S6 of FIG.

  As shown in FIGS. 5 and 6, in the second embodiment, instead of the inner passage 10 and the outer passage 11 of the refrigerant discharge member 3 described in the first embodiment, an inner passage 20 and an outer portion arranged side by side in close proximity to the left and right In addition to the provision of the passage 21, an oil suction port 22 opened at the bottom of the adapter member 12 is provided instead of the oil suction port 12b.

  Therefore, in the second embodiment, the same effect as in the first embodiment can be obtained.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, the detailed shape, material, fixing method, and the like of each component described in this embodiment can be set as appropriate.

  Further, as shown in FIG. 7, a plurality of outer passages 11 of the refrigerant discharge member 3 may be provided outside the inner passage 10.

It is sectional drawing which shows the accumulator of Example 1 of this invention. It is an end view in the S2-S2 line of FIG. It is an expanded sectional view near the bottom part of the pressure vessel of the accumulator of the first embodiment, and is a view for explaining the operation. It is a figure which shows the refrigerating cycle by which the accumulator of the present Example 1 is employ | adopted. It is sectional drawing which shows the accumulator of Example 2 of this invention. It is an end elevation in S6-S6 line of FIG. It is sectional drawing explaining the refrigerant | coolant discharge member of the other Example.

Explanation of symbols

A1 Compressor A2 Condenser A3 Internal heat exchanger A4 Expansion valve A5 Evaporator 1 Accumulator 2 Pressure-resistant container 3 Refrigerant discharge member 4 Cylindrical part 5 Upper closed part 6 Lower closed part 7 Inlet 7a Female screw groove 8 Outlet 8a Female screw groove 8b Fitting groove 9 Recesses 10, 20 Upper portion 10b (inner passage) upper portion 10b (inner passage) lower portion 11, 21 Outer passage 11a (outer passage) upper portion 11b (outer passage) lower portion 12 Adapter member 12a Swelling Portions 12b and 22 Oil inlet 13 Column 14 Oil 15 Liquid refrigerant

Claims (2)

A pressure vessel having an inlet for allowing the gas-liquid two-phase refrigerant to flow into the upper part, and an outlet for discharging the gas refrigerant;
Comprising a refrigerant discharge member accommodated in the pressure vessel,
Forming an inner passage and an outer passage formed vertically through the refrigerant discharge member;
The upper part of the inner passage communicates with the discharge port, while the upper part of the outer passage communicates with the pressure vessel,
The lower part of the inner passage and the lower part of the outer passage are communicated via an adapter member,
An accumulator characterized in that a predetermined gap is provided between the bottom of the pressure vessel and the bottom of the adapter member, and an oil suction port is provided in the bottom of the adapter member. The accumulator according to claim 1, wherein
An accumulator characterized in that a bulging portion bulging upward in a mountain shape toward the center of the inner passage is formed at the bottom of the adapter member, and an oil suction port is provided at the top of the bulging portion.

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