JPH10220927A - Structure of liquid receiving part in refrigeration cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit the capacity of an evaporator sufficiently without sacrifice of durability and economy. SOLUTION: A condenser 1 for liquefying coolant gas is coupled through a gas piping 4 with an evaporator 3 for thermally evaporating a coolant liquid in an ice making machine 2. The condenser 1 is coupled through a first liquid piping 6 with a container 5 for receiving and storing the coolant liquid and the container 5 is coupled through a second liquid piping 7 with the evaporator 3. A differential head sufficient for naturally circulating the coolant is set between the liquid container 5 and the evaporator 3 thus constituting a refrigeration cycle for making ice through natural circulation of coolant. Vertical area of a space S for storing the coolant liquid in the liquid container 5 is set larger than the transverse area of the first and second liquid piping 6, 7 and decreases upward according to a quadratic curve of the variation in the differential head and the circulation fluid resistance of coolant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser for cooling and liquefying a refrigerant gas for cooling, freezing, ice making, and the like.
An evaporator for heating and evaporating the refrigerant liquid is provided.The condenser and the evaporator are connected via a liquid pipe and a gas pipe, and the refrigerant naturally circulates and flows through a gas-liquid phase change across the condenser and the evaporator. The present invention relates to a structure of a liquid receiving portion in a refrigeration cycle configured as described above.

[0002]

2. Description of the Related Art In this type of structure, a receiver for receiving a refrigerant liquid liquefied by a condenser is generally provided between a condenser and an evaporator incorporated in an ice maker or an air conditioner. At the same time, a float valve is installed in the receiver or at a location between the receiver and the condenser to suppress fluctuations in the liquid level in the evaporator regardless of load fluctuations in the evaporator. doing.

[0003]

However, in the case of the prior art, however, it is difficult to move up and down the float valve due to dust mixed in the pipe when the pipe is connected, and when the valve element is fully closed, There is a drawback that the float valve malfunctions, such as leaks due to gaps due to the inability to adhere to the seat.Furthermore, maintenance is troublesome, economical efficiency is reduced, and the valve body and valve seat are worn out. Had the disadvantage of low durability. This disadvantage is the same when using an expansion valve.

[0004] The present invention has been made in view of such circumstances, and the structure of the liquid receiving portion in the refrigeration cycle according to the first aspect of the present invention does not reduce the durability and economy. It is another object of the present invention to provide a refrigeration cycle in which the capacity of the evaporator can be sufficiently exhibited, and the structure of the liquid receiving portion in the refrigeration cycle according to the second aspect of the present invention can be configured to also be used as a condenser so as to be inexpensive. The purpose is to:

[0005]

The invention according to claim 1 is
In order to achieve the above object, a condenser for cooling and liquefying a refrigerant gas and an evaporator for heating and evaporating the refrigerant liquid are provided, and the condenser and the evaporator are connected via a liquid pipe and a gas pipe. At the same time, in the structure of the liquid receiving part in the refrigeration cycle configured to allow the refrigerant to flow naturally through the gas-liquid phase change between the condenser and the evaporator, the refrigerant is liquefied by the condenser between the condenser and the evaporator. A liquid reservoir for receiving and storing the refrigerant liquid flowing down, connecting the condenser and the liquid reservoir via a first liquid pipe, and connecting the liquid reservoir and the evaporator via a second liquid pipe. Connected, between the liquid reservoir and the evaporator, equipped with a head difference sufficient to allow the refrigerant to naturally circulate,
The area in the vertical direction of the storage space for storing the refrigerant liquid in the liquid storage container is larger than the cross-sectional area of the first and second liquid pipes, and the resistance to the circulation flow resistance of the refrigerant with respect to the change in the head difference. It is configured such that it becomes smaller toward the upper side so as to change with the combined quadratic curve.

According to a second aspect of the present invention, there is provided a condenser for cooling and liquefying a refrigerant gas, and an evaporator for heating and vaporizing the refrigerant liquid. And a liquid receiving part in a refrigeration cycle in which the refrigerant is connected through a liquid pipe and a gas pipe, and the refrigerant flows naturally through a gas-liquid phase change across the condenser and the evaporator. A primary member that flows a cooling fluid that cools the refrigerant gas, and a secondary member that can store the refrigerant liquid condensed and liquefied while flowing the refrigerant cooled by the cooling fluid, and the secondary member Between the head and the evaporator, a head difference sufficient to allow the refrigerant to circulate naturally is provided, and the area in the vertical direction of the storage space for storing the refrigerant liquid of the secondary member is defined as the cross-sectional area of the gas pipe and the liquid pipe. Greater than and Tsu is configured to be small enough upwardly to vary the secondary curve fit circulation flow resistance of the refrigerant to changes in de difference.

[0007]

The operation of the structure of the liquid receiving part in the refrigeration cycle according to the first aspect of the present invention is as follows. In the evaporator, the pressure loss due to the circulating flow resistance of the refrigerant, such as the evaporation resistance in the evaporator and the flow resistance in the gas pipe and the liquid pipe, is shown in FIG. As shown, it changes to form a quadratic curve. Therefore, when the load on the evaporator increases, the amount of refrigerant gas evaporating in the evaporator increases, and a large circulation flow resistance of the refrigerant is applied to the rise of the refrigerant gas. Although the liquid level of the refrigerant liquid in the inside rapidly decreases, in the present invention, the area of the storage space for storing the refrigerant liquid in the liquid storage container as viewed in the vertical direction is a quadratic curve adjusted to the circulation flow resistance of the refrigerant. Since it is smaller as it changes upward, the rise of the liquid level of the refrigerant liquid in the liquid storage container can be increased, and a large head difference can be provided between the liquid storage container and the evaporator. For this reason, even if the load on the evaporator increases and the evaporation amount of the refrigerant liquid increases, the refrigerant liquid can be satisfactorily supplied against the back pressure, and regardless of the load fluctuation on the evaporator, The liquid level change can be suppressed, the heat transfer area in the evaporator can be sufficiently utilized, and the so-called liquid back, in which the refrigerant liquid is unexpectedly mixed into the gas pipe, can be prevented.

Further, according to the structure of the liquid receiving portion in the refrigeration cycle of the invention according to the second aspect, the secondary side member constituting the condenser is provided with the refrigerant liquid storage space, and the refrigerant liquid storage space is provided. Since the area in the vertical direction becomes smaller in the upward direction so as to change according to a quadratic curve adapted to the circulation flow resistance of the refrigerant, the load on the evaporator increases, and the liquid level of the refrigerant liquid in the evaporator increases. Even if the temperature of the secondary liquid is rapidly lowered, the rise of the liquid level of the refrigerant liquid in the secondary member can be increased, and a large head difference can be provided between the secondary member and the evaporator. Therefore, regardless of the load fluctuation in the evaporator, the liquid level change in the evaporator can be suppressed, the heat transfer area in the evaporator can be sufficiently utilized, and the refrigerant liquid is unexpectedly mixed into the gas pipe. So-called liquid back can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is an overall configuration diagram showing a first embodiment of the structure of the liquid receiving section in the refrigeration cycle according to the present invention.
A condenser 1 for cooling and liquefying the refrigerant gas and an evaporator 3 for heating and vaporizing the refrigerant liquid in the ice making machine 2 are connected via a gas pipe 4.

A liquid storage container 5 for receiving and storing the refrigerant liquid liquefied and flowing down in the condenser 1 is connected to the condenser 1 via a first liquid pipe 6, and the liquid storage container 5 is connected to the evaporator. 3 is connected via a second liquid pipe 7, and a head difference is provided between the liquid reservoir 5 and the evaporator 3 to allow the refrigerant to circulate and flow naturally, and ice is made by the natural circulation of the refrigerant. The refrigeration cycle is configured as described above.

A storage space S for storing the refrigerant liquid in the liquid storage container 5
Of the first and second liquid pipes 6, when viewed from the vertical direction.
7 is configured to be larger than each cross-sectional area, and to be smaller toward the upper side so as to change in accordance with a quadratic curve corresponding to the circulation flow resistance of the refrigerant with respect to a change in head difference.

FIG. 3A is a longitudinal sectional view of a main part showing a second embodiment of the structure of the liquid receiving portion in the refrigeration cycle according to the present invention. The difference from the first embodiment is as follows. It is on the street.

That is, the liquid reservoir 5 is formed in a flask shape, and a first liquid pipe 6 is connected to an upper side of the liquid reservoir 5, while a second liquid pipe 6 is connected to a bottom side of the liquid reservoir 5. 7 is connected.

The area of the storage space S for storing the refrigerant liquid in the liquid storage container 5 as viewed in the vertical direction is larger than the cross-sectional area of each of the first and second liquid pipes 6 and 7, and It is configured so that it becomes smaller toward the upper side so as to change with a quadratic curve matching the circulation flow resistance of the refrigerant with respect to the change in the difference.

FIG. 3B is a longitudinal sectional view of a main part showing a third embodiment of the structure of the liquid receiving section in the refrigeration cycle according to the present invention. The difference from the first embodiment is as follows. It is on the street.

That is, the liquid reservoir 5 is composed of an outer wall member 5a having a truncated cone shape and an inner wall member 5b having a substantially cylindrical shape, and a storage for storing a refrigerant liquid formed by the outer wall member 5a and the inner wall member 5b. A first liquid pipe 6 is provided above the space S.
Is connected, while the second liquid pipe 7 is connected to the bottom side of the storage space S.

The area of the storage space S in the vertical direction is larger than the cross-sectional area of each of the first and second liquid pipes 6 and 7, and the circulation of the refrigerant in response to a change in the head difference. It is configured such that it becomes smaller toward the upper side so as to change with a quadratic curve corresponding to the flow resistance.

FIG. 3C is a longitudinal sectional view of a main part showing a fourth embodiment of the structure of the liquid receiving portion in the refrigeration cycle according to the present invention. The difference from the first embodiment is as follows. It is on the street.

That is, the liquid storage container 5 comprises a cylindrical outer wall member 5c and an inverted conical inner wall member 5d, and a storage space for storing a refrigerant liquid formed by the outer wall member 5c and the inner wall member 5d. The first liquid pipe 6 on the upper side of S
Is connected, while the second liquid pipe 7 is connected to the bottom side of the storage space S.

The area of the storage space S as viewed in the vertical direction is larger than the cross-sectional area of each of the first and second liquid pipes 6 and 7, and the circulation of the refrigerant in response to a change in the head difference. It is configured such that it becomes smaller toward the upper side so as to change with a quadratic curve corresponding to the flow resistance.

FIG. 3D is a longitudinal sectional view of a main part showing a fifth embodiment of the structure of the liquid receiving section in the refrigeration cycle according to the present invention. The difference from the first embodiment is as follows. It is on the street.

That is, the liquid storage container 5 is composed of a conical outer wall member 5e and a cylindrical inner wall member 5f whose only lower end is slightly widened outside, and the outer wall member 5e and the inner wall member 5f are formed.
The first liquid pipe 6 is connected to the upper side of the storage space S for storing the refrigerant liquid formed by the above, and the second liquid pipe 7 is connected to the bottom side of the storage space S.

The area of the storage space S as viewed in the vertical direction is configured to be larger than the cross-sectional area of each of the first and second liquid pipes 6 and 7, and the refrigerant circulates in response to a change in head difference. It is configured such that it becomes smaller toward the upper side so as to change with a quadratic curve corresponding to the flow resistance.

FIG. 3 (e) is a longitudinal sectional view of a main part showing a sixth embodiment of the structure of the liquid receiving section in the refrigeration cycle according to the present invention. The difference from the first embodiment is as follows. It is on the street.

That is, the liquid storage container 5 is formed in a shape in which the lateral portion of the cylindrical body has an inclined wall surface, and a first liquid pipe 6 is connected to an upper side of the liquid storage container 5. Container 5
The second liquid pipe 7 is connected to the bottom side of.

The area of the storage space S for storing the refrigerant liquid in the liquid storage container 5 as viewed in the vertical direction is larger than the cross-sectional area of each of the first and second liquid pipes 6 and 7, and It is configured so that it becomes smaller toward the upper side so as to change with a quadratic curve matching the circulation flow resistance of the refrigerant with respect to the change in the difference.

FIG. 4A is a longitudinal sectional view of a main part showing a seventh embodiment of the structure of the liquid receiving portion in the refrigeration cycle according to the present invention. The difference from the first embodiment is as follows. It is on the street.

That is, the condenser 1 has a primary member 8 for flowing a cooling fluid for cooling the refrigerant gas, and a secondary member for flowing the refrigerant cooled by the cooling fluid and storing the condensed and liquefied refrigerant liquid. And the secondary side member 9
The gas pipe 4 is connected to the upper end of the second member 9, while the liquid pipe 10 is connected to the lower end of the secondary member 9.

The secondary member 9 is constituted by a spiral pipe which is formed at a constant pitch and bent outward toward the lower side while having a constant pitch, and is constituted by a smaller diameter pipe in the secondary member 9. The inserted primary side member 8 is inserted.

Between the inner peripheral surface of the secondary member 9 and the outer peripheral surface of the primary member 8, an annular refrigerant liquid storage space S1 capable of storing the refrigerant liquid is formed. The area of the refrigerant liquid storage space S1 when viewed in the vertical direction is larger than the cross-sectional area of the gas pipe 4 and the liquid pipe 10, and changes with a quadratic curve adjusted to the circulation flow resistance of the refrigerant with respect to the change in head difference. It is configured so as to be smaller upward. Although not shown, a head difference is provided between the secondary member 9 and the evaporator, which is sufficient to allow the refrigerant to flow naturally.

FIG. 4B is a longitudinal sectional view of a main part showing an eighth embodiment of the structure of the liquid receiving portion in the refrigeration cycle according to the present invention. The difference from the seventh embodiment is as follows. It is on the street.

That is, the primary member 8 is formed of a spiral pipe bent so that the pitch becomes smaller toward the upper side, and the secondary member 9 is formed of a cylindrical body that covers the primary member 8. Between the inner peripheral surface of the secondary member 9 and the outer peripheral surface of the primary member 8, a refrigerant liquid storage space S1 capable of storing the refrigerant liquid is formed, and the refrigerant liquid storage space S1 is viewed in the vertical direction. The area is larger than the cross-sectional area of the gas pipe 4 and the liquid pipe 10, and becomes smaller toward the upper side so as to change with a quadratic curve corresponding to the circulation flow resistance of the refrigerant with respect to the change in the head difference. Have been.

FIG. 4C is a longitudinal sectional view of a main part showing a ninth embodiment of the structure of the liquid receiving section in the refrigeration cycle according to the present invention. The difference from the seventh embodiment is as follows. It is on the street.

That is, the secondary member 9 is constituted by a spiral pipe formed by bending so that the pitch becomes smaller toward the lower side, and the primary member 8 is constituted by a cylindrical body covering the secondary member 9. Between the inner peripheral surface of the primary member 8 and the outer peripheral surface of the secondary member 9, a refrigerant liquid storage space S1 capable of storing the refrigerant liquid is formed, and the refrigerant liquid storage space S1 is viewed in the vertical direction. Is larger than the cross-sectional area of the gas pipe 4 and the liquid pipe 10, and becomes smaller toward the upper side so as to change with a quadratic curve corresponding to the circulation flow resistance of the refrigerant with respect to the change in the head difference. It is configured.

According to the seventh embodiment, the eighth embodiment and the ninth embodiment, since the liquid receiving section is constituted by using the secondary member 9 constituting the condenser 1, the constitution is not limited. It has the advantage that it can be simplified.

In the above embodiment, the refrigerating cycle including the evaporator 3 constituting the ice making machine 2 has been described. However, the present invention provides, for example, a cooling coil 6 of an air conditioner provided in a building such as a building. The present invention can be applied to various refrigeration cycles, such as a refrigeration cycle provided with a refrigeration cycle including an evaporator constituting a refrigerator.

The above-mentioned quadratic curve has a difference in the circulating flow resistance of the refrigerant depending on the refrigeration cycle to be applied, but is predetermined for each refrigeration cycle, and accordingly, the vertical direction of the storage space S and the refrigerant liquid storage space S1 is correspondingly determined. What is necessary is just to use what was designed so that the area in the direction view may become small toward the upper part.

[0039]

As described above, according to the structure of the liquid receiving portion in the refrigeration cycle according to the first aspect of the present invention, the area of the storage space of the liquid storage container as viewed in the vertical direction is reduced by the load on the evaporator. Similar to the change in pressure loss due to fluctuations, the upper part is reduced so that it changes with a quadratic curve that matches the circulation flow resistance of the refrigerant, and the liquid level change in the evaporator is suppressed regardless of the load fluctuation in the evaporator. It can make full use of the heat transfer area in the evaporator and prevents so-called liquid back, in which the refrigerant liquid enters the gas pipe unexpectedly. It is possible to avoid a decrease in efficiency and economy. Moreover, since the heat transfer area of the evaporator is fully utilized, the capacity of the evaporator should be fully exhibited without increasing the size of the evaporator in anticipation of a decrease in the level of the refrigerant liquid due to evaporation. And can improve economic efficiency.

According to the structure of the liquid receiving portion in the refrigeration cycle according to the second aspect of the present invention, the secondary member constituting the condenser is provided with a refrigerant liquid storage space, and the refrigerant liquid storage space is arranged in the vertical direction. Similar to the change in pressure loss with respect to the load fluctuation in the evaporator, the visual area is made smaller toward the upper side so as to change according to a quadratic curve adjusted to the circulation flow resistance of the refrigerant. The liquid level change in the evaporator can be suppressed, the heat transfer area in the evaporator can be fully utilized, and the refrigerant liquid can be prevented from accidentally entering the gas pipes, so-called a liquid back. By not using such a valve, it is possible to avoid deterioration in durability and economy. Moreover, since the heat transfer area of the evaporator is fully utilized, the capacity of the evaporator should be fully exhibited without increasing the size of the evaporator in anticipation of the decrease in the liquid level of the refrigerant liquid due to evaporation. And can improve economic efficiency. In addition, since it is configured to also serve as a condenser for receiving the refrigerant liquid, it is not necessary to provide a dedicated liquid storage container as in the invention according to claim 1, and the configuration can be simplified and inexpensive,
Economic efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a graph showing a relationship between a load of an evaporator and a pressure loss.

FIG. 2 is an overall system configuration diagram showing a first embodiment of a structure of a liquid receiving section in the refrigeration cycle according to the present invention.

FIG. 3A is a longitudinal sectional view of a main part of a second embodiment, and FIG.
Is a longitudinal sectional view of a main part of the third embodiment, (c) is a longitudinal sectional view of a main part of the fourth embodiment, (d) is a longitudinal sectional view of a main part of the fifth embodiment, and (e). FIG. 14 is a longitudinal sectional view of a main part of the sixth embodiment.

FIG. 4A is a longitudinal sectional view of a main part of a seventh embodiment, and FIG.
Is a longitudinal sectional view of a main part of the eighth embodiment, and FIG.
It is a longitudinal section of an important section of an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Condenser 3 ... Evaporator 4 ... Gas piping 5 ... Liquid piping 6 ... 1st liquid piping 7 ... 2nd liquid piping 8 ... Primary member 9 ... Secondary member 10 ... Liquid piping S ... Storage space S1 … Refrigerant liquid storage space

Claims (2)

[Claims] A condenser for cooling and liquefying the refrigerant gas; and an evaporator for heating and vaporizing the refrigerant liquid, wherein the condenser and the evaporator are connected via a liquid pipe and a gas pipe, and A structure of a liquid receiving portion in a refrigeration cycle configured to allow a refrigerant to naturally circulate and flow by a gas-liquid phase change across a condenser and the evaporator, wherein the condenser is provided between the condenser and the evaporator. A liquid storage container is provided for receiving and storing the refrigerant liquid liquefied and flowing down,
The condenser and the liquid reservoir are connected via a first liquid pipe, and the liquid reservoir and the evaporator are connected via a second liquid pipe. With a head difference sufficient to allow the refrigerant to flow naturally,
The area in the vertical direction of the storage space for storing the refrigerant liquid in the liquid storage container is larger than the cross-sectional area of the first and second liquid pipes, and the refrigerant circulates with respect to the change in the head difference. A structure of a liquid receiving part in a refrigeration cycle, characterized in that the liquid receiving part is configured so as to become smaller in an upward direction so as to change according to a quadratic curve adapted to flow resistance. 2. A condenser for cooling and liquefying a refrigerant gas, and an evaporator for heating and evaporating the refrigerant liquid, wherein the condenser and the evaporator are connected via a liquid pipe and a gas pipe, and A structure of a liquid receiving portion in a refrigeration cycle configured to naturally circulate and flow a refrigerant by a gas-liquid phase change across a condenser and the evaporator, wherein a cooling fluid for cooling a refrigerant gas flows through the condenser. A primary-side member and a secondary-side member capable of storing a refrigerant liquid condensed and liquefied while flowing a refrigerant cooled by a cooling fluid, and a refrigerant between the secondary-side member and the evaporator. Provided with a head difference sufficient for natural circulation flow, the area of the storage space for storing the refrigerant liquid of the secondary side member as viewed in the vertical direction is larger than the cross-sectional area of the gas pipe and the liquid pipe, and For changes in head differences On the other hand, the structure of the liquid receiving portion in the refrigeration cycle is characterized in that the liquid receiving portion in the refrigeration cycle is configured so as to become smaller toward the upper side so as to change according to a quadratic curve corresponding to the circulation flow resistance of the refrigerant.