box

Abstract

Provided is a tank capable of suppressing the generation of bubbles while suppressing the number of components and manufacturing costs. The tank includes a trunk that is a bottomed cylindrical body having an opening at one end; a head portion provided to the opening of the trunk and having an inflow hole through which a fluid flows into the trunk; and a guide portion provided to the head portion, which receives the fluid flowing through the inflow hole and guides the fluid toward an inner peripheral surface of the trunk. The fluid guided by the guide portion contacts the inner peripheral surface in a direction different from the normal direction of the inner peripheral surface.

Description

Technical Field

[0001] This utility model relates to a box. Background Technology

[0002] To separate the refrigerant circulating in the refrigeration cycle into gas and liquid and store it, a collection tank or liquid receiver is used.

[0003] In the refrigeration cycle, high-pressure refrigerant discharged from the compressor flows into the condenser, where it exchanges heat with the outside air, is cooled, and condenses. The condensed liquid refrigerant undergoes gas-liquid separation in the liquid receiver, and then its pressure is reduced by the expansion valve, becoming a mist-like gas-liquid phase. The depressurized refrigerant then absorbs heat from the air supply air of the air conditioner fan in the evaporator, evaporating and exchanging heat. After passing through the evaporator, the refrigerant undergoes gas-liquid separation in the receiver before being drawn into the compressor.

[0004] The head of the liquid collector has a refrigerant inlet and a refrigerant outlet that communicate with the inside of the liquid collector. The refrigerant inlet is connected to the condenser via piping, and the refrigerant outlet is connected to the expansion valve via piping.

[0005] In one type of existing refrigerant collection tank, there is a structure that allows refrigerant flowing in from a refrigerant inlet formed at the head to fall directly onto the liquid surface of the refrigerant stored in the collection tank. There is a concern that the falling refrigerant colliding with the liquid surface may generate bubbles, thereby hindering gas-liquid separation within the collection tank.

[0006] In contrast, in the liquid collection tank disclosed in Patent Document 1, the lower end of the supply pipe installed at the head is positioned below the liquid surface in the liquid collection tank, allowing refrigerant flowing through the refrigerant inlet to be supplied into the liquid collection tank via the supply pipe. According to this structure, by allowing the refrigerant to flow out from the lower end of the supply pipe below the liquid surface, the generation of air bubbles in the liquid collection tank can be suppressed.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent document 1: Japanese Patent Application Publication No. 2021-169881.

[0010] Technical problem to be solved by the utility model

[0011] However, in the liquid collection tank of Patent Document 1, there is a technical problem that the number of parts increases and the manufacturing cost increases because a supply pipe needs to be installed in the liquid collector. Utility Model Content

[0012] This invention was made in view of the technical problem, and its purpose is to provide a box that can suppress the generation of air bubbles while reducing the number of parts and manufacturing costs.

[0013] Technical means for solving technical problems

[0014] To achieve the above objectives, the box involved in this utility model is characterized by having:

[0015] The trunk is a bottomed cylindrical shape with an opening at one end;

[0016] A head, disposed at the opening of the torso, and having an inlet orifice for allowing fluid to flow into the torso; and

[0017] A guide portion, which is an opening or slit formed in the head, receives fluid flowing through the inlet and guides the fluid toward the inner circumferential surface of the torso.

[0018] The fluid guided by the guide portion contacts the inner circumferential surface in a direction different from the normal direction of the inner circumferential surface.

[0019] Effects of the utility model

[0020] According to this invention, a box that can suppress the generation of air bubbles while reducing the number of components and manufacturing costs can be provided. Attached Figure Description

[0021] Figure 1 This is a longitudinal sectional view of the liquid collection tank according to the first embodiment.

[0022] Figure 2 It is an observation from above. Figure 1 A diagram of the AA section.

[0023] Figure 3 This refers to the liquid collection tank involved in the second embodiment. Figure 2 The same sectional view.

[0024] Figure 4 This refers to the liquid collection tank involved in the third embodiment. Figure 2 The same sectional view.

[0025] Figure 5 This is a cross-sectional view showing the area near the head of the collection tank according to the fourth embodiment.

[0026] Symbol Explanation

[0027] 1.1C Liquid Collection Tank

[0028] 2. Main body of the box

[0029] 3. Trunk

[0030] 3c Reduced diameter cylinder section

[0031] 3d large diameter cylinder

[0032] 3e Conical cylindrical section

[0033] 4, 4A, 4B, 4C Head

[0034] 6. Outflow tube

[0035] 8, 8A, 8B, 8C Refrigerant inlet holes

[0036] 9. Refrigerant outlet hole

[0037] 20 Water collection filter pipes

[0038] 21. Shell

[0039] 22. Filter. Detailed Implementation

[0040] The following describes the implementation of this utility model with reference to the accompanying drawings, using a liquid collection tank as an example.

[0041] Generally, a refrigeration cycle, in addition to a liquid receiver, includes a compressor, condenser, expansion valve, evaporator, and receiver. In this cycle, high-pressure refrigerant discharged from the compressor flows into the condenser, where it exchanges heat with outside air, is cooled, and condenses. The condensed liquid refrigerant undergoes gas-liquid separation in the liquid receiver and is then depressurized by the expansion valve, becoming a mist-like gas-liquid phase. The depressurized refrigerant absorbs heat from the airflow from the air conditioning fan in the evaporator and evaporates, thus exchanging heat. After passing through the evaporator and undergoing gas-liquid separation in the receiver, the refrigerant is drawn into the compressor. This refrigeration cycle is, for example, part of a vehicle's air conditioning system.

[0042] In a refrigeration cycle, the amount of liquid refrigerant circulating in the cycle can vary depending on its operating status. For example, in a refrigeration cycle with multiple evaporators, if the number of operating evaporators changes, the amount of liquid refrigerant circulating will also change accordingly. Furthermore, in structures where the refrigeration cycle is configured to also provide heating functions, such as in electric vehicles, the variation in the amount of refrigerant circulating becomes even greater.

[0043] When the circulation rate of the liquid refrigerant decreases due to the aforementioned fluctuations, the remaining refrigerant is stored in the liquid collector. Conversely, when the circulation rate of the liquid refrigerant increases due to the same fluctuations, the insufficient refrigerant is supplied from the liquid collector. Thus, the liquid collector not only functions to separate the refrigerant gas and liquid phases but also to absorb fluctuations in the refrigerant circulation rate. To absorb these fluctuations, it is sometimes necessary to further increase the capacity of the liquid collector.

[0044] (First Implementation)

[0045] The following describes the specific structure of the liquid collection tank. Figure 1 This is a longitudinal sectional view of the liquid collection tank 1 according to the first embodiment. Figure 2 It is an observation from above. Figure 1 A diagram of the AA section. Furthermore, in Figure 2 In this specification, to indicate the positional relationship between the intermediate flow path 8c and the second flow path 8b described later, the intermediate flow path 8c is represented by an imaginary line (double-dotted line). The collection tank 1 includes a tank body 2, an outlet pipe 6 disposed within the tank body 2, a bag 11 containing desiccant (hygroscopic agent) DA, and a water collection filter pipe 20. Furthermore, in this specification, the axis also includes its extension.

[0046] A bag 11 containing desiccant DA is disposed between the outflow pipe 6 and the inner circumferential surface of the body 3.

[0047] The main body 2 of the box has a torso 3 and a head 4. Here, the side of the head 4 relative to the bottom surface 3a of the torso 3 is positioned above, and the side of the torso 3 relative to the head 4 is positioned below.

[0048] The trunk 3 is formed as a cylinder with at least an open upper end, and as an example, it is formed as a bottomed cylinder. Here, when referred to as a bottomed cylinder, it includes a cylinder that is open at only one end, and a cylinder that is open at both ends and one end is closed by other components.

[0049] The torso 3 is formed by connecting a narrow-diameter cylindrical section (first cylindrical section) 3c, a large-diameter cylindrical section (second cylindrical section) 3d that is larger in diameter than the narrow-diameter cylindrical section 3c and connected to the bottom wall 3b, and a tapered cylindrical section 3e that connects the narrow-diameter cylindrical section 3c and the large-diameter cylindrical section 3d. The tapered cylindrical section 3e expands in diameter as it faces downward. The inner circumferential surface of the tapered cylindrical section 3e forms a face that extends in a direction intersecting the axis of the torso 3.

[0050] In particular, even when a further increase in the capacity of the collection tank is required, it is sometimes difficult to make the length of the collection tank longer in order to avoid interference with surrounding components. On the other hand, by increasing the overall inner diameter of the body 3, the capacity of the collection tank can be increased, but considering the welding strength between the head 4 and the body 3, it is sometimes difficult to increase the outer diameter of the head 4. Therefore, in this embodiment, instead of suppressing the inner diameter of the narrow-diameter cylindrical portion 3c that is welded to the head 4, a larger-diameter cylindrical portion 3d is used to increase the capacity of the collection tank. Therefore, a conical cylindrical portion 3e is provided to connect the narrow-diameter cylindrical portion 3c and the large-diameter cylindrical portion 3d.

[0051] Within the bottom surface 3a of the torso 3, the area opposite to the outflow pipe 6 in the vertical direction and its surrounding area are, for example, planes orthogonal to the axis of the torso 3. The term "orthogonal plane" here includes strictly orthogonal planes and planes that are approximately orthogonal due to manufacturing errors. In this embodiment, the bottom wall 3b of the torso 3 has a shape that bulges downwards into a frustum-shaped cone. The center of the bottom surface 3a within the torso 3 and its surrounding area are formed as a plane orthogonal or approximately orthogonal to the axis of the torso 3.

[0052] The head 4 is formed by coaxially connecting an upper disc portion 4a and a lower disc portion 4b, which has a smaller diameter than the upper disc portion 4a, and covers the opening at the upper end of the torso 3. The outer peripheral surface of the upper disc portion 4a is a cylindrical surface. Here, "cylindrical surface" refers to a shape in which the outer peripheral surface has a constant diameter in the axial direction when viewed in a cross-section orthogonal to the axis. The outer peripheral surface of the lower disc portion 4b is also a cylindrical surface.

[0053] The upper disc portion 4a of the head 4 is joined to the tapered cylindrical portion 3c of the body 3 via a welding portion 10 through a circumferential joint, thereby concealing the opening of the body 3. Thus, in this embodiment, the head 4 is a cylinder with a different outer diameter and is coaxial with the body 3. Furthermore, coaxiality is not only strictly coaxial but also allows for deviations due to manufacturing errors, etc. That is, coaxiality includes not only being tightly coaxial but also being approximately coaxial.

[0054] Furthermore, here, the axis of the head 4 and the axis of the torso 3 are coaxial, but depending on the shape of the head 4, they may be non-coaxial. For example, if the lower disc portion 4b is eccentric relative to the upper disc portion 4a, the lower disc portion 4b is not coaxial with the torso 3. These torsos 3 and heads 4 are, for example, formed of metals such as aluminum alloy.

[0055] The head 4 has a refrigerant inlet hole 8 and a refrigerant outlet hole 9.

[0056] The refrigerant inlet 8 has a cylindrical first flow path 8a, a cylindrical second flow path 8b, and a cylindrical intermediate flow path 8c connecting the first flow path 8a and the second flow path 8b. The inner diameter of the first flow path 8a is larger than the inner diameters of the intermediate flow path 8c and the second flow path 8b. The first flow path 8a and the intermediate flow path 8c are coaxial with each other and are formed parallel to the axis of the head 4.

[0057] Here, the positions of the first flow path 8a, the intermediate flow path 8c, and the refrigerant outlet hole 9 will be described. As will be described later, the refrigerant outlet hole 9 is a straight hole whose axis is parallel to the axis of the head 4. In this embodiment, the first flow path 8a, the intermediate flow path 8c, and the refrigerant outlet hole 9 are arranged on both sides of the axis of the head 4. Furthermore, the axes of the first flow path 8a and the intermediate flow path 8c and the axis of the refrigerant outlet hole 9 are arranged on an imaginary straight line passing through the axis of the head 4 and orthogonal to the axis of the head 4. In addition, in this embodiment, the axes of the first flow path 8a and the intermediate flow path 8c and the axis of the refrigerant outlet hole 9 are offset relative to the axis of the head 4, but either axis may be coaxial with the axis of the head 4.

[0058] Returning to the description of the refrigerant inlet hole 8. The second flow path 8b is a straight hole extending from the intermediate flow path 8c toward, for example, the refrigerant outlet hole 9. In this embodiment, the axis of the second flow path 8b is formed to intersect (orthogonal to) the axis of the head 4. That is, the second flow path 8b extends radially along the head 4. The end of the second flow path 8b protrudes to the outer peripheral surface of the lower disc portion 4b. In this embodiment, the end of the second flow path 8b is radially opposite to the conical cylinder portion 3e in the direction of extension of the second flow path 8b. Furthermore, in this embodiment, since the head 4 is coaxial with the body 3, the end of the second flow path 8b is radially opposite to the conical cylinder portion 3e in the body 3. The axis of the second flow path 8b passes through the inner peripheral surface of the conical cylinder portion 3e.

[0059] The first flow path 8a and the intermediate flow path 8c constitute the upstream side of the refrigerant inlet hole 8 and form a first part extending along the axial direction of the body 3. Furthermore, the second flow path 8b constitutes a second part, i.e., a guide portion, which is located downstream of the first part, extends in a direction intersecting the axial direction of the body 3, and is opposite to the conical cylindrical portion 3e.

[0060] In this embodiment, the outer peripheral surface of the lower disc portion 4b is a cylindrical surface centered on the axis of the torso 3. Therefore, the distance from the outer peripheral surface of the lower disc portion 4b to the inner peripheral surface of the conical cylinder portion 3e is constant at any position along the circumferential direction around the axis of the torso 3. Therefore, the outflow opening (end opening) of the second flow path 8b opens at the position where the distance from the outer peripheral surface of the head 4 to the inner peripheral surface of the conical cylinder portion 3e is minimized.

[0061] Furthermore, when the distance from the outer peripheral surface of the head 4 to the inner peripheral surface of the conical cylinder 3e is not constant in its circumferential position along the axis of the torso 3, it is preferable that the outlet opening of the second flow path 8b opens at the position where the distance from the outer peripheral surface of the head 4 to the inner peripheral surface of the conical cylinder 3e is minimized. For example, when the distance from the outer peripheral surface of the head 4 to the conical cylinder 3e is not constant in its circumferential position along the axis of the torso 3, the lower disc portion 4b is not coaxial with the torso 3.

[0062] The refrigerant outlet 9 has a cylindrical third flow path 9a and a cylindrical fourth flow path with a smaller diameter than the third flow path 9a. The third flow path 9a and the fourth flow path 9b are coaxial with each other and are formed along the axis of the head 4. The lower end of the fourth flow path 9b is connected to a cylindrical infeed opening 9c with a larger diameter than the fourth flow path 9b, and the lower end of the infeed opening 9c protrudes onto the lower surface of the lower disc portion 4b.

[0063] An annular recess 4c is formed on the lower surface of the lower disc portion 4b around the lower end of the press-in opening 9c. The upper end of the outlet pipe 6 is pressed into and installed in the press-in opening 9c. Furthermore, by riveting the inner wall of the annular recess 4c, the press-in opening 9c is plastically deformed by reducing its diameter, and the inner circumferential surface of the press-in opening 9c abuts against the outer circumferential surface of the outlet pipe 6.

[0064] The upper end of the outlet pipe 6 abuts against the step of the fourth flow path 9b and the infeed opening 9c, thereby determining the distance from the lower surface of the head 4 to the lower end of the outlet pipe 6.

[0065] The outlet pipe 6 extends to the vicinity of the bottom wall of the body 3, with its lower end located below the liquid surface of the refrigerant (not shown). The area of ​​the outlet pipe 6 and the plane in the bottom surface 3a within the body 3 that is orthogonal to the axis of the body 3 are opposite each other in the vertical direction.

[0066] A cylindrical water collection filter pipe 20 is provided at the lower end of the outflow pipe 6. The water collection filter pipe 20 consists of a hollow housing 21 with windows (not shown) on the side wall and a filter 22 arranged all around the inner side of the housing 21. The filter 22 has the function of capturing foreign matter contained in the liquid refrigerant in the body 3 and allowing the refrigerant to pass through. The filter 22 is, for example, a mesh-like component.

[0067] In the liquid collection tank 1 with the above structure, the piping from the condenser is connected to the first flow path 8a of the refrigerant inlet 8, and the piping to the expansion valve is connected to the third flow path 9a of the refrigerant outlet 9. During the operation of the refrigeration cycle, the gas-liquid mixed refrigerant supplied from the condenser enters the head 4 through the first flow path 8a, and after passing through the intermediate flow path 8c, is discharged into the body 3 through the second flow path 8b.

[0068] Since the second flow path 8b is axially opposite to the conical cylinder portion 3e, the refrigerant discharged from the second flow path 8b contacts the inner circumferential surface of the conical cylinder portion 3e. Here, the axis of the second flow path 8b is orthogonal to the axis of the body 3, and the normal N of the inner circumferential surface at the intersection point P of the axis of the second flow path 8b and the inner circumferential surface of the conical cylinder portion 3e is inclined relative to the axis of the second flow path 8b (not orthogonal in the plane formed by the normal and the axis). Therefore, the refrigerant discharged from the second flow path 8b contacts the inner circumferential surface of the conical cylinder portion 3e at an angle, thereby suppressing the rebound of refrigerant from the inner circumferential surface and inhibiting the generation of bubbles.

[0069] In this embodiment, as described above, to increase the capacity of the collection tank, a conical cylindrical portion 3e and a large-diameter cylindrical portion 3d are formed in the body 3. By utilizing these components, the generation of bubbles can be suppressed at low cost without using inflow pipes or the like. Specifically, by contacting the inner circumferential surface of the conical cylindrical portion 3e with the refrigerant, the refrigerant is transmitted along the inclined inner circumferential surface, and then the refrigerant is transmitted and descends along the inner circumferential surface of the large-diameter cylindrical portion 3d. Therefore, compared to the case where the refrigerant falls directly to the liquid surface from the refrigerant inflow hole 8, it can reach the liquid surface in a reduced and stable state, thus suppressing the generation of bubbles. However, even if the conical cylindrical portion 3e has a shape that expands in diameter as it faces upwards, for example, the same effect can be expected.

[0070] At this point, the gaseous refrigerant contained in the refrigerant floats to the liquid surface due to buoyancy, and then moves into the space above the liquid surface. Thus, the gas and liquid phases of the refrigerant are separated.

[0071] On the other hand, the liquid refrigerant below the liquid surface enters the inner side of the outlet pipe 6 through the water collection filter pipe 20, and flows out to the outside through the outlet pipe 6 and the refrigerant outlet hole 9. The water collection filter pipe 20 is located below the liquid surface, so only the liquid refrigerant flows into the outlet pipe 6, and the gaseous refrigerant does not flow into the outlet pipe 6. Thus, only the liquid refrigerant flows towards the downstream expansion valve.

[0072] (Second Implementation)

[0073] Figure 3 This refers to the liquid collection tank involved in the second embodiment. Figure 2 The same sectional view. In Figure 3 In this embodiment, to indicate the positional relationship between the intermediate flow path 8c and the second flow path 8b, the intermediate flow path 8c is represented by an imaginary line (double-dotted line). In this embodiment, only the structure of the head 4A and the refrigerant inlet 8A is different; the other structures are the same as in the first embodiment, so repeated descriptions are omitted.

[0074] The head 4A differs only in the structure of the lower disc portion 4Ab related to the refrigerant inlet 8A; otherwise, its structure is the same as in the first embodiment. In addition to the second flow path 8b, the refrigerant inlet 8A also has a fifth flow path 8Ad and a sixth flow path 8Ae connected to the lower end of the intermediate flow path 8c. Preferably, the inner diameters of the second flow path 8b, the fifth flow path 8Ad, and the sixth flow path 8Ae are equal. The second flow path 8b, the fifth flow path 8Ad, and the sixth flow path 8Ae constitute the second part and the guide portion. This embodiment is an example where the refrigerant inlet 8A has multiple end openings. The number of end openings of the refrigerant inlet 8A can also be two or four or more.

[0075] In a plane orthogonal to the axis of head 4A (refer to...) Figure 3 The axis of the fifth flow path 8Ad is orthogonal to the axis of the second flow path 8b, and the axis of the sixth flow path 8Ae is also orthogonal to the axis of the second flow path 8b. Therefore, the axes of the fifth flow path 8Ad and the sixth flow path 8Ae are common.

[0076] In this embodiment, the axis of the second flow path 8b is orthogonal to the axis of the body 3. The axes of the fifth flow path 8Ad and the sixth flow path 8Ae are torsional to the axis of the body 3. When viewed along the axial direction of the second flow path 8b, the axes of the fifth flow path 8Ad and the sixth flow path 8Ae are orthogonal to the axis of the body 3. Furthermore, since the normal to the inner circumferential surface of the conical cylinder portion 3e is inclined relative to the axes of the second flow path 8b, the fifth flow path 8Ad, and the sixth flow path 8Ae (not orthogonal in the plane formed by the normal and the axes), the refrigerant discharged from the second flow path 8b, the fifth flow path 8Ad, and the sixth flow path 8Ae through the intermediate flow path 8c contacts the inner circumferential surface of the conical cylinder portion 3e at three points at an angle, thereby suppressing the rebound of refrigerant from the inner circumferential surface and thus suppressing the generation of bubbles.

[0077] Furthermore, according to this embodiment, since the combined cross-sectional area of ​​the second flow path 8b, the fifth flow path 8Ad, and the sixth flow path 8Ae is larger than the cross-sectional area of ​​the intermediate flow path 8c, the flow rate of the refrigerant through the second flow path 8b, the fifth flow path 8Ad, and the sixth flow path 8Ae is slower than the flow rate of the refrigerant through the intermediate flow path 8c. As a result, by stabilizing the flow of the refrigerant, the generation of bubbles can be further suppressed.

[0078] (Third implementation method)

[0079] Figure 4 This refers to the liquid collection tank involved in the third embodiment. Figure 2 The same cross-sectional view. In this embodiment, only the structure of the head 4B and the refrigerant inlet 8B is different; the rest of the structure is the same as in the first embodiment, so repeated descriptions are omitted. Furthermore, in Figure 4In order to represent the positional relationship between the intermediate flow path 8c and the bearing surface 4Bg described later, the intermediate flow path 8c is represented by an imaginary line (double-dotted line).

[0080] The head 4B differs only in the structure of the lower disc portion 4Bb related to the refrigerant inlet 8B; otherwise, its structure is the same as in the first embodiment. The refrigerant inlet 8B does not have a second flow path, but has a first flow path 8a. Figure 1 The first part consists of an intermediate flow path 8c and a slit 4Bf, and the second part consists of an intermediate flow path 8c and a slit 4Bf. The lower end of the intermediate flow path 8c is used as an end opening.

[0081] In the lower disc portion 4Bb, a slit 4Bf is formed from its outer peripheral surface toward the axis of the head 4B to the point where the intermediate flow path 8c is exposed. Within the slit 4Bf, a crescent-shaped bearing surface 4Bg is formed, opposite to the end opening of the intermediate flow path 8c, and a side surface 4Bh is formed orthogonally to the bearing surface 4Bg. The bearing surface 4Bg is a plane orthogonal to the axis of the body 3, constituting a guide portion. However, the bearing surface 4Bg is not limited to a plane; it can also be a curved surface or a surface with concave and convex shapes. Furthermore, it can also be inclined relative to the plane orthogonal to the axis of the head 4B.

[0082] In this embodiment, the refrigerant entering the slit 4Bf through the intermediate flow path 8c also contacts the bearing surface 4Bg, and its flow direction changes to the radial direction along the bearing surface 4Bg. However, due to the obstruction of the side surface 4Bh, it does not flow towards the refrigerant outlet hole 9. The bearing surface 4Bg is orthogonal to the axis of the body 3, and the normal to the inner circumferential surface of the conical cylinder 3e ( Figure 1 The refrigerant is inclined relative to the radial lines of the bearing surface 4Bg centered on the axis of the intermediate flow path 8c (not orthogonal in the plane formed by the normal and the radial lines). Therefore, the refrigerant discharged radially from the outer edge of the bearing surface 4Bg contacts the inner circumferential surface of the conical cylinder 3e at an incline, thereby suppressing the rebound of refrigerant from the inner circumferential surface and suppressing the generation of bubbles.

[0083] Furthermore, according to this embodiment, since the cross-sectional area of ​​the slit 4Bf in the flow direction is larger than the cross-sectional area of ​​the intermediate flow path 8c, the flow rate of the refrigerant through the slit 4Bf is slower than the flow rate of the refrigerant through the intermediate flow path 8c. Therefore, by stabilizing the flow of the refrigerant, the generation of bubbles can be further suppressed.

[0084] (Fourth Implementation)

[0085] Figure 5 This is a cross-sectional view showing the vicinity of the head 4C of the liquid collection tank 1C according to the fourth embodiment. In this embodiment, only the structure of the head 4C and the refrigerant inlet 8C is different; the rest of the structure is the same as in the first embodiment, so repeated descriptions are omitted.

[0086] The head 4C differs only in the structure of the lower disc portion 4Cb related to the refrigerant inlet hole 8C; otherwise, its structure is the same as in the first embodiment. The refrigerant inlet hole 8C differs only in the structure of the second flow path 8Cb, which serves as the second part and guide portion; the first flow path 8a and the intermediate flow path 8c, which serve as the first part, are the same as in the first embodiment.

[0087] In this embodiment, the axis of the second flow path 8Cb is not orthogonal to the axis of the body 3, and is inclined in a manner that approaches the large-diameter cylinder 3d as it moves downwards. The axis of the second flow path 8Cb intersects the inner circumferential surface of the large-diameter cylinder 3d, and the normal N1 of the large-diameter cylinder 3d at the intersection point P1 of the axis of the second flow path 8Cb and the inner circumferential surface of the large-diameter cylinder 3d is orthogonal to the axis of the body 3.

[0088] In this embodiment, since the second flow path 8Cb is opposite to the large-diameter cylinder 3d, the refrigerant discharged from the second flow path 8Cb contacts the inner circumferential surface of the large-diameter cylinder 3d. Here, since the axis of the second flow path 8Cb is inclined relative to the normal N1 of the inner circumferential surface at the intersection point P1 (not orthogonal in the plane formed by the normal and the axis), the refrigerant discharged from the second flow path 8Cb contacts the inner circumferential surface of the large-diameter cylinder 3d at an incline. Therefore, by suppressing the rebound of refrigerant from the inner circumferential surface, the generation of bubbles can be suppressed.

[0089] The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, instead of making the body into a cylindrical shape, it can also be made into a polygonal cylindrical shape. In addition to the liquid collection tank described above, the "box" can also be a liquid storage tank disposed between the evaporator and the compressor.

[0090] This specification contains the following disclosures of utility models.

[0091] (First method)

[0092] A box that has:

[0093] The trunk is a bottomed cylindrical shape with an opening at one end;

[0094] A head, disposed at the opening of the torso, and having an inlet orifice for allowing fluid to flow into the torso; and

[0095] A guide portion, which is an opening or slit formed in the head, receives fluid flowing through the inlet and guides the fluid toward the inner circumferential surface of the torso.

[0096] The fluid guided by the guide portion contacts the inner circumferential surface in a direction different from the normal direction of the inner circumferential surface.

[0097] (Second method)

[0098] In the first type of box,

[0099] A portion of the inner circumferential surface of the torso has a face extending in a direction intersecting the axial direction of the torso.

[0100] The fluid flowing from the guide comes into contact with the face.

[0101] (Third method)

[0102] In the first or second method box,

[0103] The torso has a first cylindrical portion, a conical cylindrical portion, and a second cylindrical portion. The first cylindrical portion forms the end of the opening side. The conical cylindrical portion is connected to the first cylindrical portion and expands in diameter away from the first cylindrical portion. The second cylindrical portion is connected to the conical cylindrical portion and forms the range of the torso to the bottom wall.

[0104] The inner circumferential surface of the conical cylindrical portion is the face surface.

[0105] (Fourth method)

[0106] In any of the three methods, the box is used.

[0107] A portion of the outflow opening, which includes the inner side of the torso, forms the guide portion, and the outflow opening is opposite the face in the extending direction of the guide portion.

[0108] (Fifth method)

[0109] In the fourth type of box,

[0110] The inlet orifice has:

[0111] The first part, which constitutes the upstream side of the inflow hole and extends along the axial direction of the body; and

[0112] The second part, which constitutes the downstream side of the first part, extends in a direction intersecting the axial direction and is opposite to the face in that extending direction.

[0113] The second part constitutes the guide section.

[0114] (Sixth method)

[0115] In the fifth type of box,

[0116] The outflow opening of the second part opens at the position on the outer peripheral surface of the head that is at the minimum distance from the face.

[0117] (Seventh method)

[0118] In any of the five methods, the box is used.

[0119] The second part has multiple outflow openings.

[0120] (Eighth Method)

[0121] In any of the three methods, the box is used.

[0122] The inlet hole is a hole extending along the axial direction of the torso and has an end opening on the inner side of the torso.

[0123] The guide portion is the surface opposite to the end opening.

Claims

1. A box, characterized in that, have: The trunk is a bottomed cylindrical shape with an opening at one end; A head, which is disposed at the opening of the torso and has an inlet hole for allowing fluid to flow into the torso; as well as A guide portion, which is an opening or slit formed in the head, receives fluid flowing through the inlet and guides the fluid toward the inner circumferential surface of the torso. The fluid guided by the guide portion contacts the inner circumferential surface in a direction different from the normal direction of the inner circumferential surface.

2. The box according to claim 1, characterized in that, A portion of the inner circumferential surface of the torso has a face extending in a direction intersecting the axial direction of the torso. The fluid flowing from the guide comes into contact with the face.

3. The box according to claim 2, characterized in that, The torso has a first cylindrical portion, a conical cylindrical portion, and a second cylindrical portion. The first cylindrical portion forms the end of the opening side. The conical cylindrical portion is connected to the first cylindrical portion and expands in diameter away from the first cylindrical portion. The second cylindrical portion is connected to the conical cylindrical portion and forms the range of the torso to the bottom wall. The inner circumferential surface of the conical cylindrical portion is the face surface.

4. The box according to claim 2, characterized in that, A portion of the outflow opening, which includes the inner side of the torso, constitutes the guide portion, and the outflow opening is opposite to the face in the extending direction of the guide portion.

5. The box according to claim 4, characterized in that, The inlet orifice has: The first part, which constitutes the upstream side of the inflow hole and extends along the axial direction of the body; and The second part, which constitutes the downstream side of the first part, extends in a direction intersecting the axial direction and is opposite to the face in that extending direction. The second part constitutes the guide section.

6. The box according to claim 5, characterized in that, The outflow opening of the second part opens at the position on the outer peripheral surface of the head that is at the minimum distance from the face.

7. The box according to claim 5, characterized in that, The second part has multiple outflow openings.

8. The box according to claim 1, characterized in that, The inlet hole is a hole extending along the axial direction of the torso and has an end opening on the inner side of the torso. The guide portion is the surface opposite to the end opening.

Images