JPH0942805A - Freezing cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a heat transfer efficiency further and save energy by a method wherein a heat exchanger is vibrated by a vibration applying device under utilization of pressure of refrigerant of a freezing cycle. SOLUTION: Refrigerant flowing from a compressor passes through a pipe 57, passes through a high pressure side refrigerant passage 55 within a piston, passes through a piston driving bypass pipe 59, reaches a pressure chamber 54 and then causes a force to move a piston 52 in a rightward direction. Then, the refrigerant passes in a refrigerant passage 55 at a high pressure side within the piston due to a rightward motion of the piston 52, the refrigerant passes through a piston driving bypass pipe 61, reaches a pressure chamber 53 to cause a force to push the piston 52 in a leftward direction. Accordingly, since either an evaporator or a condenser is operated under utilization of a cylinder piston and a vibration transferring angle acting as a vibration applying device, it is possible to increase a heat transfer efficiency of a heat exchanger. In addition, since a power source for improving a heat transfer efficiency is not used, it is possible to attain an energy saving.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating cycle of a heat exchanger for a refrigerating machine or a heat pump, which is widely used for refrigerating and air-conditioning devices and which transfers heat between a fluid such as refrigerating machine and air. The present invention relates to a refrigeration cycle in which the heat transfer coefficient between air and a heat exchanger is improved more effectively by applying vibration to the refrigeration cycle.

[0002]

2. Description of the Related Art An example of the structure of a general refrigeration cycle using a conventional heat exchanger is shown in FIG. In FIG. 7, the refrigeration cycle includes a compressor 10, a condenser 20, an expansion valve or a capillary tube 30, and an evaporator 40. The control unit 130 compresses the refrigeration cycle according to the internal temperature state detected by the internal temperature detector 120. The machine 10 and the internal fan etc. are controlled.

In the evaporator 40 and the condenser 20 of this type of refrigeration cycle, in order to promote heat exchange between the heat transfer tubes or heat transfer fins (not shown) of the heat exchanger and the air in contact with them. Japanese Patent Application Laid-Open No. 48-38555 proposes an evaporator 40 and a condenser 20 to which a vibrator is attached.

Further, as shown in FIG. 8, a vibrator 115 is attached to the heat transfer tubes 12 and 32 in order to increase the heat transfer coefficient between the heat transfer tube and the refrigerant flowing inside thereof.
It is proposed in Japanese Patent Publication No. 1-6600. This is a large number of vibrators 1 that have the function of detecting the vibration of the refrigerant in the pipes along the outer wall of the heat transfer tubes 12 and 32 and the function of giving the vibration to the refrigerant.
15 is provided, and after the arithmetic control circuit 140 measures the output from the vibrator 115 due to the vibration of the refrigerant in the pipe at regular time intervals and calculates the optimum vibration intensity to obtain a large heat transfer coefficient from the measured value. The drive command for the vibrator 115 is sent to the DC power supply.

[0005]

In the conventional device constructed as described above, in order to improve the heat transfer efficiency of the heat exchanger, the heat exchanger is vibrated to generate air generated in the radiating fins of the heat exchanger. Although it would destroy the boundary layer, the vibration required external power supply during operation of the compressor. In addition, a mainstream velocity of 1 m / s is applied to the radiation fins of the heat exchanger.
When ec air is applied, the boundary layer of air generated at the trailing edge of the radiating fin (position about 30 mm from the tip) is about 3 m.
It is about m, and 3 is required to destroy this boundary layer of air.
Since an amplitude of mm or more is applied, the energy applied from the outside becomes large. According to our experiment, a high frequency output of about 100 W is required to give an amplitude of 0.5 mm in the experiment using the ultrasonic transducer, and at such an amplitude, there is no effect of improving the heat transfer coefficient. It was

In the heat exchanger targeted by the present invention, since the refrigerant flows in the heat transfer tube in a state close to the speed of sound, the flow in the tube is sufficiently turbulent. It is believed that there is little effect in promoting heat transfer between the two. The object of the present invention has been made in view of the above problems, and in a heat exchanger that improves heat transfer efficiency by applying vibration to an evaporator and a condenser, the heat transfer efficiency is further enhanced and energy saving is achieved. To provide a refrigeration cycle.

[0007]

In order to achieve the above object, the refrigerating cycle of the present invention is characterized in that the invention according to claim 1 has fins and front fins which are arranged in parallel at regular intervals and through which a gas flows. In a refrigeration cycle consisting of a heat exchanger tube that penetrates and a fluid flows inside, and a refrigeration cycle that consists of a compressor, piping, etc., vibration is applied to the heat exchanger by a vibration applying device that uses the pressure of the refrigerant in the refrigeration cycle. The heat exchange efficiency of the heat exchanger is increased.

In addition to the configuration of the invention described in claim 1, the invention described in claim 2 uses a cylinder, a piston and a vibration transmitting angle as the vibration applying device. In addition to the configuration of the invention according to claim 2, the invention according to claim 3 uses a non-magnetic material such as aluminum as a material of a cylinder for vibrating the heat exchanger of the vibration applying device. Is.

In addition to the structure of the invention described in claim 2, the invention described in claim 4 uses a permanent magnet as a material of a piston for vibrating the heat exchanger of the vibration applying device. is there. Further, in addition to the configuration of the invention according to claim 2, the invention according to claim 5 uses a ferromagnetic material from outside the cylinder for the piston in the cylinder for vibrating the heat exchanger of the vibration applying device. The vibration is applied to the heat exchanger, and the heat exchanger is vibrated at the angle.

Furthermore, in addition to the structure of claim 1, the invention of claim 6 is provided with a plurality of temperature detectors at the inlet and outlet of the heat exchanger, and based on the temperature difference detected at the inlet and outlet, According to the heat exchange state of the heat exchanger in the refrigeration cycle, the throttling amount of the vibration throttling valve is changed to change the vibration frequency.

According to the above structure, the pressure of the refrigerant in the refrigeration cycle is utilized only when the compressor is operating, and the cylinder or piston and the vibration transmitting angle are used as the vibration applying device to operate the evaporator or the condenser. Not only can the heat transfer efficiency of the exchanger be improved, but also because a power source for improving the heat transfer efficiency is not used, energy can be saved.

Further, in the present invention, when the temperature difference between the inlet and the outlet of the evaporator or the condenser does not reach a predetermined value, the pressure of the refrigerant in the refrigeration cycle is used to give vibration to the evaporator and the condenser. When the heat transfer efficiency of the evaporator and the condenser is not good, the heat transfer efficiency can be improved and energy saving can be achieved.

Further, according to the present invention, since the opening degree of the variable expansion valve can be changed according to the temperature difference between the inlet and the outlet of the evaporator or the condenser, a fine heat transfer depending on the heat transfer state of the evaporator and the condenser. You can control.

[0014]

Embodiments of the refrigeration cycle of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration diagram of a refrigeration cycle system using the heat exchanger of the present invention.
The refrigeration cycle using the heat exchanger of the present invention can be applied to a refrigerator, an air conditioner, etc., but here, an example applied to a refrigerator is shown.

Therefore, regarding the connection of the vibrating device (vibration applying device), the vibrating device is connected only to the evaporator in the embodiment of the refrigeration cycle of the present invention, but in the case of the air conditioner The vibration device may be installed on the condenser side, but the description is omitted here because it is limited to the refrigerator.

In FIG. 1, for convenience of explanation, the same parts as those in the configuration diagram of the refrigeration cycle system using the conventional heat exchanger shown in FIG. 7 are designated by the same reference numerals. The configuration of this embodiment is the same as that of a general refrigerator except for the temperature detectors provided at the inlet and outlet of the heat exchanger, the vibration device, and the variable expansion valve for the vibration device.

Basically, like the configuration of the refrigerating cycle system shown in FIG. 7, here, a vibration device 50 is attached to the evaporator 40, and a temperature detector 80 and an outlet are provided at the inlet and outlet of the heat transfer tube of the evaporator 40. 90 is attached. Further, each unit of the refrigeration cycle system and the control device 130 are connected.

There are an evaporator inlet temperature detector 80, an evaporator outlet temperature detector 90, and a refrigerator internal temperature detector 120 that provide an input signal to the control device 130, and the control device 130 provides an output signal. Is the compressor 10,
There is an evaporator-exciting variable expansion valve 100 and an internal fan 110.

FIG. 2 is an external view of a vibrating device in the refrigerating cycle of the present invention, and FIG. 3 is a lateral cross-sectional view of the essential parts of the vibrating device. In FIG. 2, 57 is a high-pressure side pipe connected to the variable expansion valve 100 for a vibration device via the discharge-side pipe of the compressor 10, and 58 is a low-pressure side pipe connected to the suction-side pipe of the compressor 10. Reference numeral 60 is a vibration transmitting angle, 200 is a cylinder outer cylinder, and 210 and 220 are vibration transmitting angle stoppers. Further, in FIG. 3, 51 is an inner wall of the cylinder, 52 is a piston, and 59.61.62.63 are bypass pipes for driving the piston of the vibration device. Also,
4 and 5 are drawings for explaining the operation of the vibration device of FIG. 55 is a high pressure side refrigerant passage in the piston. Reference numeral 56 is a low pressure side refrigerant passage.

The operation of each embodiment of the refrigeration cycle of the present invention will be described below. First, the inventions of the first and second embodiments (corresponding to the configurations of claims 1 and 2) will be described with reference to FIGS. 1, 4 and 5. The description of the refrigeration cycle is the same as that of a general refrigerator, and therefore detailed description thereof is omitted here.

In FIG. 1, when the compressor 10 starts to operate, the refrigerant is pressurized by the compressor 10 and the compressor 1
The discharge side pressure of 0 rises, and the refrigerant is condensed in the condenser 20 and the expansion valve 3
0, passing through the evaporator 40 and returning to the absorption port of the compressor 10. At this time, a part of the refrigerant discharged from the discharge side of the compressor 10 at the same time is diverted to the heat exchanger vibration cylinder through the vibration device variable expansion valve 100.

Next, the operation of the vibrating device will be described with reference to FIGS. 4 and 5. First, in FIG. 4, the refrigerant from the compressor 10 passes through the pipe 57 and the high pressure side refrigerant passage 55 in the piston.
Through the bypass pipe 59 for driving the piston and the pressure chamber 5
4, the force that pushes the piston 52 to the right acts. At this time, the pressure chamber 53 is connected to the suction side of the compressor 10 through the piston driving bypass pipe 63, the low pressure side refrigerant passage 56 in the piston, and the low pressure side pipe 58.
3 is under low pressure. Therefore, the piston 52 is pulled to the low pressure side and moves to the right (state of FIG. 5).

Next, the movement from the state shown in FIG. 5 will be described. The refrigerant from the compressor 10 passes through the high-pressure side pipe 57, and the piston moves to the right side from the state of FIG. 4 described above. Therefore, the refrigerant passes through the in-piston high-pressure side refrigerant passage 55 and the piston drive bypass pipe 61. A force that reaches the pressure chamber 53 and pushes the piston 52 to the left acts. At this time, since the pressure chamber 54 is connected to the suction side of the compressor 10 through the piston driving bypass pipe 62, the low pressure side refrigerant passage 56 in the piston and the low pressure side pipe 58, the pressure chamber 54 is in a low pressure state. Has been. Therefore, the piston 52 moves to the left (returns to the state of FIG. 4).

As described above, the states of FIGS. 4 and 5 are repeated during the operation of the compressor 10. The vibration is transmitted to the heat exchanger (here, the evaporator) by using the vibration transmitting angle described in the following claims.
It will vibrate in the direction shown in. Further, at this time, the vibration speed of the piston changes depending on the amount of the refrigerant passing through the high pressure side pipe, and the vibration frequency to the heat exchanger also changes.

Next, third to fifth embodiments (inventions corresponding to the configurations of claims 3 to 5) will be described. The operation of the vibrating device is as described above, but in the state of FIGS. 4 and 5, the piston operates but the vibration is not transmitted to the heat exchanger. Also, in order to transmit the vibration, it is sufficient to directly connect the vibration angle to the piston, but the piston part is filled with high-pressure refrigerant, and if the airtightness is not sufficient, the refrigerant will leak and impair the function of the refrigeration cycle. It will be.

In FIG. 3, the cylinder inner wall 51 and the outer cylinder 200 are made of a non-magnetic material such as aluminum,
A piston 52 made of a permanent magnet is used inside, and by covering it with a vibration angle made of a ferromagnetic material so as to surround the cylinder outer cylinder, it becomes a closed state in a cycle. The vibration of the piston can be transmitted to the vibration angle through the magnetic force. Further, stoppers 210 and 220 are provided so that the vibration angle does not over-line with the high-speed vibration of the piston.

The vibrating device described above can save energy because the vibrating device can be formed without leaking refrigerant and without adding new vibrating energy.

Next, a sixth embodiment (an invention corresponding to the structure of claim 6) will be described with reference to FIG. In FIG. 6, after the program is started, the RAM is cleared and various initial settings are performed in step # 10, and the refrigerator control process is performed in step # 20. Then, in step # 30, the refrigerator internal temperature detector 120 detects the refrigerator internal temperature.

At this time, in step # 40, it is determined whether the internal cold storage temperature is equal to or higher than a predetermined temperature or lower, and if the internal cold storage temperature is lower than the set temperature, the compressor 10 is not operated in step # 60. Also, as the compressor is stopped, step # 7
At 0, the variable expansion valve for vibration is closed and the supply of the refrigerant to the vibration device 50 is stopped, so that the vibration of the heat exchanger is stopped. On the contrary, if the internal temperature is higher than the set temperature, the operation of the compressor 10 is started in step # 50.

Here, when the compressor 10 is operating, the inlets of the evaporator 40 are controlled by the temperature detectors 80 and 90 provided at the inlet and outlet of the heat transfer tube of the evaporator 40 in step # 80. And the temperature difference at the outlet is detected. The large temperature difference indicates that the heat transfer efficiency of the heat exchanger is good.

In step # 90, it is judged whether or not the temperature difference between the inlet and the outlet of the heat transfer tube of the evaporator 40 exceeds a predetermined value (for example, 5 ° C.).
Then, the excitation variable expansion valve 100 is closed to shut off the refrigerant to the vibration device 50, and the vibration of the evaporator 40 is stopped. Further, when the temperature difference between the inlet and the outlet of the heat transfer tube does not exceed the predetermined value (for example, 5 ° C.), the temperature difference (for example, 2 degrees and 4 degrees) is measured in steps # 110 and # 120, respectively. At # 130, # 140 and # 150, the opening of the variable throttle valve for the vibration exciter is determined to optimize the vibration amount.

The temperature difference and the set value used here are merely reference examples, and the optimum value and the temperature difference value calculated by experiments are actually used.

[0033]

Since the refrigeration cycle of the present invention is constructed as described above, according to the inventions of claims 1 and 2, the refrigerating cycle is applied by the pressure difference of the refrigerant in order to improve the heat transfer coefficient of the heat exchanger. Since the vibrating piston is operated, the vibrating device can be formed without adding new vibrating energy, so that not only the ability can be improved but also energy saving can be achieved.

According to the inventions of claims 3 to 5, the heat exciter cylinder is made of a non-magnetic material such as aluminum and the piston is made of a permanent magnet. By covering the piston in the vibration cylinder from the outside of the cylinder with a vibration angle made of a ferromagnetic material, and applying a vibration to the heat exchanger at the angle, Although it is in a closed state in a cycle, the vibration of the piston is transmitted to the vibration angle via magnetic force, so that there is no refrigerant leakage and the vibration device can be created without adding new vibration energy. Therefore, energy saving can be achieved.

Further, according to the invention of claim 6,
If the temperature difference between the inlet and outlet of the heat transfer tubes of the evaporator or condenser does not reach the specified value, vibrate the vibration device attached to the evaporator or condenser, and vibrate depending on the temperature difference. Since the amount of throttling of the variable expansion valve is changed, an efficient heat transfer state can be created depending on the temperature difference state when the heat transfer efficiency of the heat exchanger is not good, so thermal efficiency is improved and energy saving is achieved. be able to.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a refrigeration cycle of the present invention.

FIG. 2 is an external view of the vibration device of FIG.

FIG. 3 is a lateral cross-sectional view of a main part of the vibration device of FIG.

FIG. 4 is an operation explanatory view of the vibration device of FIG.

5 is an operation explanatory view of the vibration device of FIG.

FIG. 6 is a flowchart showing the operation of the refrigeration cycle of the present invention.

FIG. 7 is a configuration diagram of a conventional refrigeration cycle.

FIG. 8 is a configuration diagram of a heat transfer tube of a conventional refrigeration cycle.

[Explanation of symbols]

 10 Compressor 20 Condenser 30 Expansion valve 40 Evaporator 50 Vibrating device 51 Cylinder inner wall 52 Piston 53/54 Pressure chamber 55 High pressure side refrigerant passage in piston 56 Low pressure side refrigerant passage in piston 57 High pressure side pipe 58 Low pressure side pipe 59 / 61/62/63 Piston driving bypass pipe 60 Excitation angle 70 Spring 80 Evaporator inlet temperature detector 90 Evaporator outlet temperature detector 100 Exciter variable expansion valve 110 Internal fan 120 Internal chamber temperature detector 130 Control device 140 Power supply 200 Cylinder outer cylinder 210/220 Stopper

Claims (6)

[Claims] 1. A heat exchanger, which is arranged in parallel at a constant interval and comprises a fin through which gas flows between the fins and a heat transfer tube through which the fin flows and through which a fluid flows, and a compressor.
A refrigerating cycle comprising pipes and the like, wherein a vibration applying device utilizing the pressure of the refrigerant of the refrigerating cycle is used to vibrate the heat exchanger to enhance the heat exchange efficiency of the heat exchanger. 2. The refrigerating cycle according to claim 1, wherein a cylinder, a piston and a vibration transmitting angle are used as the vibration applying device. 3. The refrigeration cycle according to claim 2, wherein the cylinder is made of a non-magnetic material such as aluminum. 4. The refrigeration cycle according to claim 2, wherein the piston is made of a permanent magnet. 5. The piston in the cylinder is covered from outside the cylinder with a vibration angle made of a ferromagnetic material, and vibration is applied to the heat exchanger at the angle. The refrigeration cycle according to claim 2. 6. An inlet and an outlet of the heat exchanger are provided with a plurality of temperature detectors, and based on a temperature difference detected at the inlet and the outlet, a vibrating diaphragm is used depending on a heat exchange state of the heat exchanger in the refrigeration cycle. The refrigeration cycle according to claim 1, wherein the throttle amount of the valve is changed.