JP3017589B2 - Refrigeration cycle receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle receiver for use in an air conditioner for automobiles and the like, and more particularly to a refrigeration cycle receiver suitable for minimizing the amount of charged refrigerant. .

[0002]

2. Description of the Related Art In a refrigeration cycle of a vehicle air conditioner or the like, specific CFCs are currently being totally eliminated due to environmental problems. For this reason, as an immediate measure until it is completely abolished, it is required to reduce the amount of Freon used as a refrigerant to the minimum necessary.

On the other hand, as a conventional technique for appropriately suppressing the amount of refrigerant charged into a receiver for a refrigeration cycle, for example, Japanese Patent Application Laid-Open Nos. 59-63473, 59-176555 and 2-213667 are disclosed. There is a technique described in.

[0004] In the technique described in Japanese Patent Application Laid-Open No. 59-63473, a relief valve and a float are provided in a tank body. In this conventional technique, when the amount of charged refrigerant exceeds an appropriate amount, the amount is detected by a float, and the relief valve is opened by the float to discharge surplus refrigerant to the outside of the tank body.

In the technique described in Japanese Patent Application Laid-Open No. 59-176555, a level sensor is provided in the tank body. This level sensor has a tubular body with a built-in reed switch and a float with a magnet. In this conventional technique, when the refrigerant liquid level exceeds an appropriate amount of the charged refrigerant, the float floats up, a reed switch is turned on by a magnet, an external electric circuit is operated by the reed switch, and a charge valve for charging the refrigerant is closed. Like that.

In the technique described in Japanese Patent Application Laid-Open No. 2-213667, a desiccant is provided immediately below a refrigerant inlet provided at the top of a closed case. Further, a float having a shape covering the liquid surface of the refrigerant is disposed below the desiccant. In this conventional technique, a refrigerant flowing from a refrigerant inlet is first applied to a desiccant to reduce the flow velocity of the refrigerant. Next, the refrigerant that has passed through the desiccant is further applied to the float, so that the vibration applied to the liquid surface by the refrigerant is reduced, and the bubbles generated when the liquid surface undulates are reduced. In this way, bubbles coming up through the suction pipe are suppressed, and an attempt is made to accurately judge the appropriate amount of the charged refrigerant.

[0007] As a prior art technique and the spirit of the described in JP supra Hei 2-213667, Japanese Utility Model 63-
There are techniques disclosed in JP-A- 89-557 and JP-A- 63-63665.

[0008]

SUMMARY OF THE INVENTION Among the above prior arts, Japanese Patent Application Laid-Open Nos. 59-63473 and 59-63473.
In the technique described in 176555, the liquid refrigerant is injected from a high position above the desiccant, so that a large amount of bubbles are generated. For this reason, it cannot be applied to a method of judging an appropriate amount of the charged refrigerant by observing the state of bubbles rising in the discharge pipe (suction pipe). Therefore, according to the technique described in Japanese Patent Application Laid-Open No. 59-63473, a float for detecting the liquid level of the refrigerant and a relief valve that is opened by the float are provided to regulate the refrigerant charging amount to an appropriate amount. According to the technique described in Japanese Patent Application Laid-Open No. Sho 59-176555, a level sensor for detecting the liquid level of the refrigerant and a charge valve having an electric valve for closing an injection path by a signal from the level sensor are provided. The amount of refrigerant charged is regulated to an appropriate amount. As a result, both prior arts have a problem that the cost is unavoidable due to the provision of the device for regulating the amount of the charged refrigerant to an appropriate amount, and there is also a problem that the device breaks down.

On the other hand, Japanese Patent Application Laid-Open No.
According to the technique described in Japanese Patent No. 213667, a desiccant is provided immediately below a coolant injection port. Therefore, it is possible to suppress the generation of bubbles above the desiccant during the injection of the liquid refrigerant. However, the desiccant is placed at the top inside the closed case. For this reason, a large amount of bubbles will be generated below the desiccant, and in order to suppress this, a float that almost covers the liquid surface of the refrigerant is arranged. As a result, even in this prior art, there is a problem that the cost is increased due to the provision of the float for suppressing the generation of bubbles, and there is also a problem that the entire receiver tank (liquid receiver) cannot be made larger. .

[0010] It is an object of the present invention to reduce the generation of liquid refrigerant bubbles above and below a desiccant layer installed in a liquid receiver.
It can be kept extremely low without using special equipment,
Providing a refrigeration cycle receiver that can accurately judge the appropriate amount of refrigerant filling based on the state of bubbles coming up in the suction pipe together with the liquid refrigerant, keep it to the minimum necessary, and save refrigerant. Is to do.

[0011]

The object of the present invention is to open a refrigerant inlet at a position which is less than half the height from the lower surface to the upper surface of the inside of the receiver, and to make the inlet smaller than the refrigerant inlet. the desiccant layer was placed in a low position, also a coolant inlet
Distance between the upper surface of the desiccant layer and the lower surface inside the receiver
Distance between the lower surface of the agent layer and the lower end of the suction pipe.
The thickness of the desiccant layer is greater than any of the distances from the lower surface of the desiccant layer.
The receiver is configured to have a large size, and the receiver and the condenser are integrally connected, and the refrigerant inlet of the receiver and the header pipe on the refrigerant outlet side of the condenser are connected via a refrigerant passage. Is achieved.

[0012]

[0013] The object of the present invention is to open the refrigerant inlet at a position not more than half the height from the lower surface to the upper surface inside the receiver and to dry the refrigerant at a position slightly lower than the refrigerant inlet. The agent layer is installed, and the coolant inlet and desiccant layer top surface
Distance between the lower surface inside the receiver and the lower surface of the desiccant layer
Distance between the bottom of the suction pipe and the bottom of the desiccant layer
The thickness dimension of the desiccant layer is larger than any of the distances between
In addition, in the sight glass body, apart from the refrigerant passage for deriving the liquid refrigerant, a refrigerant passage for introducing the liquid refrigerant is provided,
A refrigerant injection pipe is connected to the outlet of the refrigerant passage for introducing the liquid refrigerant approximately vertically, and the outlet of the refrigerant injection pipe is connected to the lower part of the receiver from the lower surface to the upper surface by half or less of the height. This is also achieved by bending in a substantially horizontal direction at the height position.

Further, the object is to open the medium inlet at a position which is less than half the height from the lower surface to the upper surface inside the liquid receiver, and at a position slightly lower than the refrigerant inlet. Install a desiccant layer, and also above the refrigerant inlet and desiccant layer
Distance between the bottom surface and the bottom surface inside the receiver and the bottom surface of the desiccant layer
Distance between bottom of suction pipe and bottom of desiccant layer
The thickness of the desiccant layer should be greater than any of the distances between
And further , a refrigerant inflow pipe is provided almost vertically by penetrating the desiccant layer from the bottom of the liquid receiver, and the outlet of the refrigerant injection pipe is provided with a height from the lower surface to the upper surface inside the liquid receiver. By opening it at half the height or less,
In addition, the outlet of the refrigerant injection pipe, which is provided almost vertically from the bottom of the liquid receiver, is substantially horizontal at a height of not more than half the height from the lower surface to the upper surface inside the liquid receiver. It is also achieved by bending in the direction.

[0015]

According to the present invention, the refrigerant inflow port is opened at a height of not more than half of the height from the lower surface to the upper surface of the inside of the liquid receiver. The head can be made to flow above the desiccant layer with a reduced head. As a result, the generation of bubbles due to the head drop between the refrigerant inlet and the desiccant layer can be reduced, so that the amount of bubbles contained in the liquid refrigerant that passes through the desiccant layer and collects at the bottom of the receiver is reduced. be able to. Further, in the present invention, the desiccant layer,
Since it is installed at a position slightly lower than the refrigerant inlet provided at a height of half or less of the height from the lower surface to the upper surface of the receiver, the desiccant layer and the bottom of the receiver are provided. The generation of bubbles of the liquid refrigerant due to the head drop can be suppressed to a small amount. In combination, the present invention makes it possible to minimize the generation of bubbles of the liquid refrigerant in the present invention, whereby the state of bubbles rising together with the liquid refrigerant in the suction pipe causes the appropriate amount of refrigerant to be charged. The amount can be accurately determined, the amount of the charged refrigerant can be suppressed to a necessary minimum amount without using special equipment, and the refrigerant can be saved.

In the present invention, the receiver and the condenser are integrally connected, and the refrigerant inlet of the receiver and the header pipe on the refrigerant outflow side of the condenser are connected via the refrigerant passage. .
Thus, while miniaturizing the receiver and the condenser, the generation of bubbles of the liquid refrigerant above and below the desiccant layer can be extremely reduced without using special equipment, The appropriate amount of the charged refrigerant can be accurately determined from the state of the bubbles rising together with the liquid refrigerant in the suction pipe.

Further, in the present invention, a refrigerant passage for introducing a liquid refrigerant is provided in the sight glass body separately from the refrigerant passage for leading out the liquid refrigerant, and a refrigerant injection pipe is provided at an outlet of the refrigerant passage for introducing the liquid refrigerant. Is provided substantially vertically, and the outlet of the refrigerant injection pipe is bent in a substantially horizontal direction at a height of not more than half of the height from the lower surface to the upper surface inside the liquid receiver.

Thus, the generation of bubbles due to the high-pressure liquid refrigerant flowing out of the outlet of the refrigerant injection pipe vigorously can be suppressed, and the generation of bubbles due to the drop of the liquid refrigerant can be suppressed to a small amount. Also, the generation of bubbles of the liquid refrigerant above and below the desiccant layer can be extremely reduced without using special equipment, and from the situation of bubbles coming up with the liquid refrigerant in the suction pipe, It is possible to accurately determine the appropriate amount of the charged refrigerant.

In the present invention, the refrigerant inflow pipe is provided substantially vertically through the desiccant layer from the bottom of the receiver, and the outlet of the refrigerant injection pipe extends from the lower surface to the upper surface inside the receiver. An opening is provided at a height of less than half of the height, and the outlet of the refrigerant injection pipe is at a height of less than half of the height from the lower surface to the upper surface of the inside of the receiver. Since it is bent at the vertical position, even in these inventions, the generation of bubbles of the liquid refrigerant above and below the desiccant layer can be extremely reduced without using special equipment, and the inside of the suction pipe and the liquid refrigerant can be suppressed. It is possible to accurately determine the appropriate amount of the charged refrigerant based on the state of the bubbles coming up together.

Further, in the present invention, the generation of bubbles of the liquid refrigerant is suppressed to an extremely small amount without using a device for regulating the amount of the charged refrigerant to an appropriate amount or a device for suppressing the generation of bubbles of the liquid refrigerant. The sight glass body makes it possible to accurately judge from the state of bubbles coming up together with the liquid refrigerant in the suction pipe, so there is no fear of equipment failure, and the size of the receiver can be reduced and greatly reduced Cost reduction can be achieved.

[0021]

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

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is a system diagram showing an example of an automotive refrigeration cycle including the liquid receiver shown in FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is an explanatory diagram showing the relationship between the height positions of the main parts in the first embodiment, and FIG. 4 is a characteristic diagram of the amount of charged refrigerant in the first embodiment shown in FIG. 1 and the prior art.

In the first embodiment of the present invention shown in FIG. 1, the liquid receiver 1 has a cylindrical body 11, an upper lid 12 attached to the upper end thereof, and a liquid receiver 1 attached to the lower end of the body 11. The lower lid 13 forms a closed type.

A desiccant layer 17 is provided inside the body 11. The desiccant layer 17 is interposed between a set of the upper desiccant receiver 15 and the strainer 16 and a set of the strainer 16 and the lower desiccant receiver 14, and as shown in FIG. A thickness L ₃ is formed from the upper surface of the lower 15 to the lower surface of the lower desiccant receiver 14. As can be seen from FIGS. 1 and 3, the desiccant layer 17 is provided at a position slightly lower than the inlet union 19 attached to the body 11 of the liquid receiver 1. The desiccant layer 17 is made of a granular material, and
The upper desiccant receiver 15 and the lower desiccant receiver 14 are formed of a mesh or a perforated plate.

The sight glass body 1 is attached to the upper lid 12.
8 is attached. This sight glass body 18
Inside, a refrigerant passage 18b for deriving an inverted T-shaped liquid refrigerant
Is provided. A liquid refrigerant suction pipe 18a is attached to a lower end portion, which is an inlet of a vertically extending portion of the refrigerant passage 18b. The suction pipe 18a penetrates the desiccant layer 17 and
Extends perpendicularly from the upper surface of the lower cover 13 is a bottom internal to the position of the height L _4. A liquid refrigerant outlet union 18c is attached to an outlet portion of the refrigerant passage 18b extending in the horizontal direction. Further, a sight glass 18d is attached to an upper end of a vertical portion in the refrigerant passage 18b.

The body 11 is provided with an inlet union 19 which is an inlet for liquid refrigerant. As shown in FIG. 3, the inlet union 19 has a height from the lower surface to the upper surface of the inside of the liquid receiver 1,
It is provided in less than one-position of the height L ₂ of the half of the height L ₁ to the lower surface.

The assembling of the liquid receiver 1 is performed as follows.

First, a sight glass 18d is press-fitted into the upper end portion of the refrigerant passage 18b of the sight glass body 18 having the refrigerant passage 18b, and then swaged and fixed. Further, the upper lid 12 is attached to the lower portion of the sight glass body 18 by welding. Further, a suction pipe 18a is press-fitted into a lower end of a refrigerant passage 18b provided in the sight glass body 18 and fixed. The outlet union 18c is fixed to the outlet of the refrigerant passage 18b provided in the sight glass body 18 by an O-ring or welding. On the other hand, an inlet union 19 is attached to the body 11 by an O-ring or welding. Next, the body 1 is placed inside the upper lid 12.
After inserting 1 and fixing by welding, a unit composed of the upper desiccant receiver 15, the strainer 16, the desiccant layer 17, the strainer 16 and the lower desiccant receiver 14 is assembled inside the body 11. Next, the lower cover 13 is fitted to the outside of the lower end of the body 11 and fixed by welding to complete the liquid receiver 1.

Next, a description will be given of a case where the above-mentioned liquid receiver is incorporated in the refrigeration cycle for automobiles shown in FIG. 2 and used.

The refrigeration cycle for a vehicle comprises a compressor 2
A condenser 3 connected to a discharge port thereof through a flexible hose 6, an expansion valve 4, and an evaporator 5 connected to the expansion valve 4 through a pipe 7. The outlet side of the vessel 5 is connected to the suction port of the compressor 2 via a flexible hose 6. The receiver 1 having the above-described configuration is installed between the condenser 3 and the expansion valve 4 of the automobile refrigeration cycle, and an inlet union 19 provided in the receiver 1 is
The outlet side of the condenser 3 is connected via a pipe 7, the expansion valve 4 is connected via a pipe 7 to an outlet union 18c also provided on the receiver 1, and the receiver 1 is connected to an automotive refrigeration cycle. Incorporate.

After incorporating the liquid receiver 1 and charging the refrigerant, the automobile refrigeration cycle is operated as follows.

That is, the compressor 2 is driven by the automobile engine. The compressor 2 compresses the refrigerant, converts it into a high-temperature and high-pressure gas refrigerant, and sends it to the condenser 3 through the flexible hose 6. In the condenser 3, the high-temperature and high-pressure gas refrigerant is condensed by cooling air or the like, and is converted into a high-pressure liquid refrigerant and sent out to the receiver 1 through the pipe 7. In the liquid receiver 1, high-pressure liquid refrigerant is received through the inlet union 19, and is allowed to pass through the desiccant layer 17, which removes foreign matter, moisture, and air bubbles contained in the liquid refrigerant, and Only the refrigerant is sucked up by the suction pipe 18a, taken out of the receiver 1 through the refrigerant passage 18b and the outlet union 18c provided in the sight glass body 18, and sent to the expansion valve 4 through the pipe 7. In the expansion valve 4, the high-pressure liquid refrigerant is made into a low-pressure liquid refrigerant by passing through a small-diameter passage, and is sent out to the evaporator 5 through a pipe 7. The evaporator 5 evaporates the low-pressure liquid refrigerant, cools the air in the passenger compartment by the heat of vaporization at that time, and sends the refrigerant after cooling the passenger compartment to the compressor 2 through the flexible hose 6. In the automotive refrigeration cycle, the refrigerant is circulated and the above-described operation is repeated.

Incidentally, the condenser 3, the evaporator 5, the flexible hose 6 and the pipe 7 are designed to have a minimum necessary internal volume for the purpose of improving thermal efficiency. When the internal volumes of these devices and pipes are determined, the appropriate amount of the charged refrigerant required for the refrigeration cycle is uniquely determined with a certain width. That is, even if the rotation speed of the compressor 2 changes due to the change in the rotation speed of the engine of the automobile, or the refrigerant circulation amount changes due to the change in the state of the heat load, the refrigerant is stored or stored in the receiver 1. The amount of the refrigerant charged when the pressure of the refrigerant discharged from the compressor 2 becomes substantially constant by discharging the discharged refrigerant is an appropriate amount of the refrigeration cycle.

Next, a description will be given of a case where the appropriate amount of the above-described refrigerant charge is determined and the refrigerant is charged in the first embodiment.

In the aftermarket, when the refrigerant is charged when the air conditioner is installed, or when the refrigerant is refilled for the vehicle to which the air conditioner is already installed, the refrigeration cycle is operated under predetermined conditions to determine the appropriate amount of the charged refrigerant. The sight glass body 1 of the top lid 12 of the receiver 1 while enclosing
The liquid refrigerant coming up in the suction pipe 18a is observed through the sight glass 18d provided at 8, and when the bubbles no longer mix in the liquid refrigerant, that is, when the bubble disappearance point, an appropriate refrigerant amount for the refrigeration cycle is determined. It shall be enclosed.

If the distance from the inlet of the liquid refrigerant to the desiccant layer is long, a large amount of bubbles will be generated when the high-pressure liquid refrigerant falls, and a large amount of bubbles will remain even when the liquid refrigerant passes through the desiccant layer. .
Also, if the distance from the desiccant layer to the bottom of the receiver is long,
Bubbles are generated in large quantities for the same reason.

When the foam rises in the suction pipe together with the liquid refrigerant, the time until the foam disappears becomes long, and the above-mentioned bubble extinction point is used to judge the appropriate amount of refrigerant filling. In the liquid receiver described above, the amount of charged refrigerant tends to increase.

Therefore, in the first embodiment, the desiccant layer 17 is disposed so that the upper surface of the upper desiccant receiver 15 is disposed at a position slightly lower than the inlet union 19 serving as the refrigerant inlet.
Is installed. Thus, the amount of liquid refrigerant bubbles generated when falling from the inlet union 19 onto the upper desiccant receiver 15 can be reduced. Further, in the first embodiment, the liquid refrigerant inlet union 19 is connected to the receiver 1.
Of the height of the liquid receiver 1 from the upper surface of the lower lid 13 to the lower surface of the upper lid 12, which is the height from the lower surface to the upper surface of the inner surface of the liquid receiver 1, is set to be less than half the height L _1. The desiccant layer 17 is provided at a slightly lower position. Thus, the amount of bubbles of the liquid refrigerant that passes through the desiccant layer 17 and falls to the bottom of the liquid receiver 1 can be reduced. Therefore, in the first embodiment, it is possible to greatly reduce the amount of bubbles generated due to the head of the liquid refrigerant. As a result, the height from the lower surface to the upper surface inside the receiver 1 is L ₁ ,
As can be seen from FIG. 4 in which the height from the lower surface inside the liquid receiver 1 to the inlet union 19 is represented by L ₂ and L ₂ / L ₁ is represented as a parameter, when L ₂ / L ₁ = １ ／. In the first embodiment of the present invention, as compared with the prior art, the amount of the refrigerant determined as an appropriate amount of the charged refrigerant is about 98%. This means that according to the first embodiment of the present invention, the amount of the charged refrigerant can be reduced by about 2% as compared with the prior art, and the refrigerant can be saved. FIG. 4 also shows that the closer the height L ₂ of the mounting position of the inlet union 19, which is the refrigerant injection port, to the upper surface of the desiccant layer 17, the more the appropriate amount of the refrigerant charged tends to decrease.

The thickness dimension of the desiccant layer 17 in the height direction
Is the distance between the inlet union 19 and the upper surface of the desiccant layer 17.
Separation between the lower surface inside the liquid receiver 1 and the lower surface of the desiccant layer 17.
Distance between the lower end of the suction pipe 18a and the desiccant layer 1
7 is larger than the distance from the lower surface of
As described above, the entrance
Desiccant layer despite the lower position of the Nion 19
17 thick enough to dry
The ability of the agent layer 17 to purify foreign matter and moisture is reduced.
You can get rid of it. In addition, in the first embodiment, the proper amount of the refrigerant charge is measured, and the bubble extinction point is observed and the proper amount of the refrigerant charge is accurately determined without using any equipment for regulating the proper amount of the refrigerant charge. I can judge,
Further, the amount of generated bubbles can be significantly reduced without using any equipment for suppressing the amount of generated bubbles due to the drop of the liquid refrigerant.

FIG. 5 is a vertical sectional view showing a second embodiment of the present invention.

In the second embodiment shown in FIG. 5, a condenser 30 is integrally connected to one side of the liquid receiver 1 via a bracket 35.

The body 11 of the liquid receiver 1 is provided with a refrigerant passage 20 having a refrigerant inlet 21, a desiccant layer 17, and a sight glass body 18. A lower lid 13 is fixed to a lower end of the body 11. The refrigerant passage 20 is provided in the lower half of the body 11 of the liquid receiver 1 on the side where the condenser 30 is mounted. The coolant inlet 21 communicating with the refrigerant passage 20 is opened in less than one position in the height L ₂ of the half of the height L ₁ to the upper surface than the lower surface of the interior of the receiver 1. The desiccant layer 17 is provided at a position slightly lower than the coolant inlet 21 inside the body 11 of the liquid receiver 1. The desiccant layer 17 is interposed between a pair of the upper desiccant receiver 15 and the strainer 16 and a pair of the strainer 16 and the lower desiccant receiver 14. Inside the sight glass body 18, an inverted T-shaped refrigerant passage 18b is provided.

A suction pipe 18a is attached to the lower end of the coolant passage 18b, a sight glass 18d is attached to the upper end, and a coolant outlet 22 is provided at a portion extending to one side. In this refrigerant outlet 22,
The expansion valve 4 is connected via a pipe 7 shown in FIG.

The condenser 30 has a header pipe 31 on the refrigerant outflow side, a header pipe 32 on the refrigerant inflow side arranged at a predetermined distance from the header pipe 31, and both header pipes 31, 3.
And a plurality of heat exchange pipes 33 arranged between the two. The header pipes 31 and 32 are formed in a flat shape. An inlet union 32a is provided at an upper end of the header pipe 32 on the refrigerant inflow side, and a lower end is closed by a seal cap 32b. The inlet union 32a is connected to a discharge port of the compressor 2 via a flexible hose 6 shown in FIG. Heat exchange fins 34 are provided between adjacent heat exchange pipes in the plurality of heat exchange pipes 33. Both the upper and lower ends of the header pipe 31 on the refrigerant outflow side are closed by seal caps 31a. Further, a refrigerant passage hole 31 is provided in the lower half of the side of the header pipe 31 on the refrigerant outflow side on the side connected to the liquid receiver 1.
b is provided. The coolant passage hole 31b communicates with a coolant passage 20 provided on one side of the body 11 of the liquid receiver 1.

In the second embodiment, the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 shown in FIG. 2 flows into the header pipe 32 on the refrigerant inflow side from the inlet union 32a of the condenser 30 through the flexible hose 6. . The high-temperature and high-pressure gas refrigerant flowing into the header pipe 32 is divided into a plurality of heat exchange pipes 33, and exchanges heat with the air-cooled heat exchange fins 34 while passing through each heat exchange pipe 33. The refrigerant is condensed and becomes a high-pressure liquid refrigerant and flows into the header pipe 31 on the refrigerant outflow side. The liquid refrigerant flowing into the header pipe 31 passes through the refrigerant passage hole 31b and the refrigerant passage 20, and is supplied into the receiver 1 from the refrigerant inlet 21. The high-pressure liquid refrigerant supplied into the liquid receiver 1 is supplied to the desiccant layer 17.
After the foreign matter, moisture and bubbles are removed therefrom, they are collected at the bottom of the liquid receiver 1, then sucked up by the suction pipe 18 a, passed through the refrigerant passage 18 b provided in the sight glass body 18, and received through the refrigerant outlet 22. It is taken out of the liquid container 1. The high-pressure liquid refrigerant taken out of the liquid receiver 1 is sent to the expansion valve 4 through a pipe 7 shown in FIG.

Also in the second embodiment, the refrigerant inlet 21 is opened at a position of a height L ₂ which is not more than half of the height L ₁ from the lower surface to the upper surface inside the liquid receiver 1, Since the desiccant layer 17 is provided at a position slightly lower than the refrigerant inlet 21, the amount of bubbles generated by the liquid refrigerant can be significantly reduced. Since they are integrally connected, the size of these parts can be reduced.

FIG. 6 is a characteristic diagram showing test results relating to the compressor discharge pressure and the refrigerant filling amount index for the second embodiment of the present invention and the prior art. Here, as a conventional technique, a sight glass body, a liquid refrigerant inlet union, and an outlet union are attached to the upper part of the body of the liquid receiver, and the desiccant is placed at a position higher than the middle part in the height direction of the body. The one provided with the layer was used. On the other hand, as a second embodiment of the present invention, the coolant inlet port 2 into thirds position in the height L ₂ of the first height L ₁ from the lower surface of the interior of the receiver tank 1 to the upper surface
1 is opened, and the height L ₂ of the refrigerant inlet 21 is about 0.
The position of 8L _2, was used after placing a desiccant layer 17 to fit the upper surfaces of the upper desiccant receiving 15. In FIG. 6, reference numeral A denotes a curve representing the characteristic of the second embodiment of the present invention, reference numeral B denotes a curve representing the characteristic of the prior art, reference numeral Pa denotes a bubble vanishing point in the second embodiment of the present invention, and reference numeral. Pb is the bubble disappearance point in the prior art. As can be seen from FIG.
According to the second embodiment of the present invention, the amount of charged refrigerant can be reduced by 14% as compared with the prior art, and the refrigeration cycle can be operated without any problem with the amount of charged refrigerant. It was confirmed that the pressure could be reduced.

Next, FIG. 7 is a longitudinal sectional view showing a third embodiment of the present invention.

In the third embodiment, the inside of the sight glass body 18 is provided outside the refrigerant passage 18b for leading out the liquid refrigerant.
A refrigerant passage 23 for introducing a liquid refrigerant is provided. The refrigerant passage 23 is formed in an inverted L-shape, and an inlet union 24 is attached to an inlet portion thereof, and a refrigerant injection pipe 25 is attached to an outlet portion thereof. The refrigerant injection pipe 25 is provided substantially perpendicularly to the direction of the desiccant layer 17, and the lower end 25a is bent substantially horizontally. The bent lower end 25a of the refrigerant injection pipe 25
Has a height L ₂ from the lower surface to the upper surface of the receiver 1 of 2
An opening is provided at a position of a height L ₂ which is not more than one-half. The upper desiccant receiver 15, the strainer 16 and the desiccant layer 1 are located slightly lower than the lower end 25 a of the refrigerant injection pipe 25.
A unit consisting of a strainer 7, a strainer 16, and a lower desiccant receiver 14 is provided.

In the third embodiment, a liquid refrigerant is supplied from a condenser to an inlet union 24 provided in a refrigerant passage 22 for introducing a liquid refrigerant, and the liquid refrigerant passes through a refrigerant passage 23 and a refrigerant injection pipe 25. As a result, the refrigerant is injected onto the upper desiccant receiver 15 through the lower end 25 a of the refrigerant injection pipe 25.
At this time, since the lower end portion 25a of the refrigerant injection pipe 25 is bent in the horizontal direction, it is possible to eliminate the problem that the liquid refrigerant flows out vigorously from the refrigerant injection pipe 25 mounted substantially vertically and generates bubbles. Can be.

The other structure and operation of the third embodiment are the same as those of the first embodiment.

FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the present invention.

In the fourth embodiment, the lower cover 1
A coolant injection pipe 26 is attached substantially vertically from 3 through the desiccant layer 17. An inlet union 27 is attached to the inlet of the refrigerant injection pipe 26.
The outlet of the refrigerant injection pipe 26 projects slightly upward from the upper desiccant receiver 15, and has a height equal to or less than half the height L ₁ from the lower surface to the upper surface inside the liquid receiver 1. It is opened to the position of L _2.

In the fourth embodiment, the liquid refrigerant passes through the inlet union 27 and is injected into the upper desiccant receiver 15 through the refrigerant injection pipe 26. And this also in the fourth embodiment, the opening in the outlet portion 1 following the position of the height L ₂ of the half of the height L ₁ to the upper surface than the lower surface of the interior of the receiver 1 in the refrigerant injection pipe 26 The upper desiccant receiver 15 and the strainer 1 are located at a position slightly lower than the outlet of the refrigerant injection pipe 26.
6, desiccant layer 17, strainer 16, lower desiccant receiver 1
Since the unit composed of four is installed, the amount of bubbles generated due to the head of the liquid refrigerant can be significantly reduced.

The other structure and operation of the fourth embodiment are the same as those of the first embodiment.

FIG. 9 is a longitudinal sectional view showing a fifth embodiment of the present invention.

In the fifth embodiment, the refrigerant injection pipe 26 is formed a little longer than the fourth embodiment, and the upper end 26a is bent substantially in the horizontal direction.

As a result, in the fifth embodiment, the generation of bubbles due to the vigorous outflow of the liquid refrigerant from the refrigerant injection pipe 26 can be suppressed.

Other structures and operations of the fifth embodiment are the same as those of the fourth embodiment.

In the embodiment of the present invention in which the refrigerant injection pipe is mounted vertically, instead of bending the outlet end of the refrigerant injection pipe, the refrigerant injection pipe descends toward the outflow direction of the liquid refrigerant. Slope baffles may be provided in a staggered manner to suppress the generation of bubbles due to the vigorous outflow of the liquid refrigerant.

According to the first aspect of the present invention described above, the refrigerant inlet is opened at a height of not more than half of the height from the lower surface to the upper surface inside the receiver. Installing a desiccant layer at a position slightly lower than the refrigerant inlet, and reducing the head of the liquid refrigerant between the refrigerant inlet and the desiccant layer, and the head of the liquid refrigerant between the desiccant layer and the bottom of the receiver. Because the amount of bubbles generated due to the fall of the high-pressure liquid refrigerant can be greatly reduced, the amount of bubbles coming up together with the liquid refrigerant in the suction pipe is small, and the bubble extinction point can be accurately determined. As a result, there is an effect that the appropriate amount of the charged refrigerant is suppressed to the minimum necessary amount and the refrigerant can be saved. According to the first aspect of the present invention, the generation of bubbles of the liquid refrigerant is extremely reduced without using a device for regulating the amount of the charged refrigerant to an appropriate amount or a device for suppressing the generation of bubbles of the liquid refrigerant. It is possible to accurately judge from the sight glass body side from the situation of bubbles rising along with the liquid refrigerant in the suction pipe with a small amount, so there is no concern about equipment failure, and the receiver Also, there is an effect that the size can be reduced and the cost can be significantly reduced. Furthermore, the refrigerant inlet and the desiccant layer upper surface
Distance between the lower surface inside the receiver and the lower surface of the desiccant layer
Distance, and between the bottom of the suction pipe and the bottom of the desiccant layer
The thickness dimension of the desiccant layer larger than any of the distances
Therefore, the position of the refrigerant inlet is low to suppress the generation of bubbles.
The thickness of the desiccant layer
Therefore, the ability to purify foreign substances and moisture is low.
There is also an effect that there is no danger of lowering. The receiver and the condenser are integrally connected, and the refrigerant inlet of the receiver and the header pipe on the refrigerant outlet side of the condenser are connected via the refrigerant passage. There is an effect that the size of the liquid container and the condenser can be reduced.

[0062]

According to the second aspect of the present invention, the sight glass body is provided with a refrigerant passage for introducing a liquid refrigerant separately from the refrigerant passage for leading out the liquid refrigerant. A refrigerant injection pipe is connected to the outlet of the refrigerant passage almost vertically, and the outlet of the refrigerant injection pipe is almost at a height of one half or less of the height from the lower surface to the upper surface inside the receiver. It is bent in the horizontal direction, and according to the invention of claim 3 , the refrigerant injection pipe is provided substantially vertically through the desiccant layer from the bottom of the receiver, and the outlet of the refrigerant injection pipe is
Since the opening is provided at a height of one half or less of the height from the lower surface to the upper surface inside the receiver, the same as the invention of claim 1 is provided.
The amount of foam generated by the fall of each high-pressure liquid refrigerant
Dramatically reduce and accurately judge the appropriate amount of refrigerant charge,
There is an effect that it is possible to reduce the refrigerant to the minimum necessary and save the refrigerant.
Furthermore, according to claim 4, it is substantially vertical from the bottom of the receiver.
The outlet of the refrigerant injection pipe provided in the
At a height of less than half the height from the lower surface to the upper surface,
Bending in horizontal direction, liquid refrigerant vigorously from refrigerant injection pipe
It can suppress the generation of bubbles by flowing out
Thus, the refrigerant can be saved reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a system diagram showing an example of an automotive refrigeration cycle including the liquid receiver shown in FIG.

FIG. 3 is an explanatory diagram showing a relationship between height positions of main parts in the first embodiment shown in FIG. 1;

FIG. 4 is a characteristic diagram of the amount of charged refrigerant in the first embodiment shown in FIG. 1 and the prior art.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 6 is a characteristic diagram showing a relationship between a compressor discharge pressure and a refrigerant charging amount index for the second embodiment shown in FIG. 5 and the related art.

FIG. 7 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view showing a fifth embodiment of the present invention.

[Explanation of symbols]

1 ... liquid receiver, 11 ... body of liquid receiver, 12 ... upper lid,
13: lower lid, 14: lower desiccant receiver, 15: upper desiccant receiver, 16: desiccant layer strainer, 17: desiccant layer, 18: sight glass body, 18a: liquid refrigerant suction pipe, 18b ... Refrigerant passage for deriving liquid refrigerant, 18
c: liquid refrigerant outlet union, 18d: sight glass, 1
9: an inlet union serving as a refrigerant inlet; L ₁ : height from the lower surface to the upper surface inside the receiver; L ₂ : height position from the lower surface inside the receiver to the refrigerant inlet; A condenser integrally connected to the liquid container, 31 a header pipe on the refrigerant outflow side of the condenser, 31b a refrigerant passage hole provided in the header pipe on the refrigerant outflow side of the condenser, 32 ... a refrigerant inflow side of the condenser Header pipe, 32a ... gas refrigerant inlet union, 33 ...
Heat exchange pipe, 20 ... refrigerant passage provided in the receiver,
Reference numeral 21 denotes a refrigerant inlet, 22 denotes a refrigerant outlet provided in a sight glass body, 23 denotes a refrigerant passage for introducing a liquid refrigerant, 24 an inlet union of a liquid refrigerant, 25 denotes a refrigerant injection pipe, and 25a denotes a refrigerant injection pipe. Curved lower end, 26
... refrigerant injection pipe, 26a ... bent upper end of refrigerant injection pipe, 27 ... liquid refrigerant inlet union.

Continued on the front page (72) Inventor Ken Sorimachi 2520 Oji Takaba, Katsuta-shi, Ibaraki Pref.Hitachi, Ltd.Automotive Equipment Division Hitachi Automotive Engineering Co., Ltd. (72) Inventor Seiichi Wakairo Katsuta-shi, Ibaraki Pref. 2477 Kashima-Yatsu 3 examiner, Hitachi Automotive Engineering Co., Ltd. Tohru Uehara (56) References JP-A-2-267478 (JP, A) JP-A-4-95522 (JP, A) JP-A-4-121562 (JP, A) JP-A-2-147773 (JP, U) JP-A-2-147773 -13954 (JP, U) Actually open 58-49167 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 43/00

Claims (4)

(57) [Claims] 1. A liquid refrigerant is introduced from a condenser side through a refrigerant inlet into a closed type liquid receiver, and the liquid refrigerant passes through a desiccant layer installed in the liquid receiver to form a foreign substance. A liquid passage is provided in a sight glass body attached to the top of the receiver, by removing water and bubbles, and sucking up the purified liquid refrigerant by a suction pipe provided in the receiver. , And a refrigerant receiver for a refrigeration cycle that is led out to the expansion valve side through the refrigerant outlet, wherein the refrigerant inlet is located at a position that is equal to or less than half the height from the lower surface to the upper surface inside the receiver. causes opened, the desiccant layer is placed slightly lower position than the refrigerant inlet, also
Distance between the refrigerant inlet and the top of the desiccant layer, inside the receiver
Between the lower surface of the desiccant layer and the bottom of the desiccant layer
Than the distance between the lower end of the pump and the lower surface of the desiccant layer
The thickness dimension of the desiccant layer is configured to be large, and the liquid receiver and the condenser are integrally connected, and the refrigerant inlet of the liquid receiver and the header pipe on the refrigerant outlet side of the condenser are connected via a refrigerant passage. And a refrigeration cycle receiver. 2. A liquid refrigerant is introduced from a condenser side through a refrigerant inlet into a closed type liquid receiver, and the liquid refrigerant passes through a desiccant layer provided in the liquid receiver to form a foreign substance. , Removes water and air bubbles, sucks up the purified liquid refrigerant by a suction pipe provided inside the receiver, and transfers the liquid refrigerant to a sight glass body mounted on a sight glass body attached to the top of the receiver. , And a refrigerant receiver for a refrigeration cycle that is led out to the expansion valve side through the refrigerant outlet, wherein the refrigerant inlet is located at a position that is equal to or less than half the height from the lower surface to the upper surface inside the receiver. causes opened, the desiccant layer is placed slightly lower position than the refrigerant inlet, also
Distance between the refrigerant inlet and the top of the desiccant layer, inside the receiver
Between the lower surface of the desiccant layer and the bottom of the desiccant layer
Than the distance between the lower end of the pump and the lower surface of the desiccant layer
The thickness dimension of the desiccant layer is configured to be large, and further, in the sight glass body, a refrigerant passage for introducing a liquid refrigerant is provided separately from the refrigerant passage for leading out a liquid refrigerant, and an outlet of the refrigerant passage for introducing the liquid refrigerant is provided. The refrigerant injection pipe is connected to the part almost vertically, and the outlet part of the refrigerant injection pipe is bent almost horizontally at a height of half or less of the height from the lower surface to the upper surface inside the receiver. A receiver for a refrigeration cycle. 3. A liquid refrigerant is introduced from the condenser side through a refrigerant inlet into the closed type liquid receiver, and the liquid refrigerant is passed through a desiccant layer installed inside the liquid receiver to remove foreign matter. A liquid passage is provided in a sight glass body attached to the top of the receiver, by removing water and bubbles, and sucking up the purified liquid refrigerant by a suction pipe provided in the receiver. , And a refrigerant receiver for a refrigeration cycle that is led out to the expansion valve side through the refrigerant outlet, wherein the refrigerant inlet is located at a position that is equal to or less than half the height from the lower surface to the upper surface inside the receiver. causes opened, the desiccant layer is placed slightly lower position than the refrigerant inlet, also
Distance between the refrigerant inlet and the top of the desiccant layer, inside the receiver
Between the lower surface of the desiccant layer and the bottom of the desiccant layer
Than the distance between the lower end of the pump and the lower surface of the desiccant layer
The thickness of the desiccant layer is configured to be large, and the refrigerant inflow pipe is provided substantially vertically through the desiccant layer from the bottom of the liquid receiver, and the outlet of the refrigerant injection pipe is connected to the inside of the liquid receiver. A liquid receiver for a refrigeration cycle, characterized in that it is opened at a height of not more than half the height from the lower surface to the upper surface of the refrigeration cycle. 4. An outlet of a refrigerant injection pipe provided substantially perpendicularly to the bottom of the liquid receiver at a height of not more than half the height from the lower surface to the upper surface inside the liquid receiver. The refrigeration cycle receiver according to claim 3, wherein the receiver is bent in a horizontal direction.