JP2007271180A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of preventing increase of power consumption by controlling liquid compression by preventing degradation of refrigerating capacity in operating release valves disposed in a refrigerating cycle, even in a high-load operation such that a condenser has high temperature. <P>SOLUTION: In this air conditioner comprising the refrigerating cycle constituted by successively connecting a compressor 1, the condenser, an expansion mechanism 3 and an evaporator 4, the condenser is divided into a first condenser 2a and a second condenser 2b, and a bypass passage 6 comprising the on-off valves 5 opened and closed by a prescribed pressure, between the first condenser 2a and the second condenser 2b, and at an inflow side of the evaporator 4, is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner. More specifically, the release valve provided in the refrigeration cycle does not operate to reduce the refrigeration capacity even during high load operation such as when the condenser is hot. In addition, the present invention relates to a structure that suppresses liquid compression and does not increase power consumption.

  A conventional air conditioner is a compressor, a four-way valve, a chamber, and a chamber that are capable of preventing a decrease in refrigeration capacity without reducing the amount of refrigerant flowing through the refrigerant circuit during cooling operation at a high outside air temperature. A bypass path comprising a release valve in parallel between both sides of an expansion valve, in which a refrigerant circuit is configured by sequentially connecting an outer heat exchanger, an expansion valve, an indoor heat exchanger, and an accumulator. When the pressure difference between both sides of the expansion valve becomes a predetermined value or more during cooling operation, a configuration is disclosed in which the release valve is opened and a part of the high-pressure liquid refrigerant is controlled to be bypassed to the low-pressure side. (For example, refer to Patent Document 1).

  As a result, a refrigerant circuit having a bypass passage provided with a release valve in parallel is provided between both sides of the expansion valve, and the pressure difference between both sides of the expansion valve during cooling operation at high outside air temperature (condenser is hot). When the value exceeds the specified value, the release valve is opened and a part of the high-pressure liquid refrigerant is bypassed to the low-pressure side, thereby preventing a decrease in the refrigerating capacity without reducing the amount of refrigerant circulating in the refrigerant circuit. By connecting one end of the bypass path to the connection pipe between the expansion valve and the two-way valve, the bypass path is not affected by the vibration generated by the compressor, and the pipes that make up the bypass path are connected. It is possible to prevent the occurrence of cracks.

JP 2003-336914 A

  However, since the high pressure side refrigerant is released to the low pressure side by the release valve, the high pressure is reduced and the low pressure is increased, the difference between the low pressure refrigerant temperature and the air temperature is reduced, the heat exchange amount is reduced, and the refrigeration is reduced. There was a problem that the ability was also lowered.

  Also, since the liquid refrigerant that could not evaporate is sucked into the compressor, liquid compression will occur and the compressor will be easily damaged. There has been a problem that the amount of work increases and the power consumption increases.

  Therefore, the present invention has been made to solve the above-described problems, and the purpose of the present invention is to provide a release valve provided in the refrigeration cycle even during high load operation such as when the condenser is hot. An object of the present invention is to provide an air conditioner that operates to prevent the refrigerating capacity from being lowered, and suppresses liquid compression and does not increase power consumption.

In order to achieve the above-described object, the present invention has the following features.
In an air conditioner comprising a refrigeration cycle in which a compressor, a condenser, an expansion mechanism, and an evaporator are sequentially connected,
The condenser is divided into a first condenser and a second condenser, and a predetermined interval is provided between the first condenser and the second condenser and between the expansion mechanism and the evaporator. The present invention is characterized in that a bypass passage having an on-off valve that opens and closes by the pressure of is provided.

Moreover, in an air conditioner comprising a refrigeration cycle in which a compressor, a condenser, an expansion mechanism, and an evaporator are sequentially connected,
The condenser is divided into a first condenser and a second condenser, and the evaporator is divided into a first evaporator and a second evaporator, and the first condenser And a bypass path having an on-off valve that opens and closes at a predetermined pressure between the second condenser and between the first evaporator and the second evaporator. Yes.

  According to the present invention, since the refrigerant filling amount apparently decreases, the high-pressure side pressure can be lowered while keeping the low-pressure side pressure low, and the heat exchange amount can be reduced by reducing the temperature difference between the refrigerant and air. It is possible to suppress a decrease in the refrigerating capacity, which is the cause, and to suppress liquid compression.

  And even at the time of high load operation such as when the outside air temperature rises, the release valve provided in the refrigeration cycle does not operate and the refrigeration capacity does not decrease, and liquid compression is suppressed and power consumption does not increase. Air conditioner can be provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.
FIG. 1 is a diagram showing a first embodiment of a refrigeration cycle used in an air conditioner according to the present invention. (A) shows a first example, (B) shows a second example, and FIG. It is a figure which shows the 2nd Example of the refrigerating cycle used for an air conditioner, (A) shows a 3rd example, (B) shows a 4th example, FIG. 3 is used for the refrigerating cycle of a 4th example. FIG. 4 is a diagram illustrating a third embodiment of the refrigeration cycle used in the air conditioner according to the present invention. FIG. 4A is a fifth example, and FIG. 4B is a sixth example. FIG. 5 is an explanatory view of an on-off valve and a temperature sensor used in the refrigeration cycle of the air conditioner according to the present invention, and FIG. 6 shows a fourth embodiment of the refrigeration cycle used in the air conditioner according to the present invention. In the figure, (A) shows the seventh example, (B) shows the eighth example, and FIG. 7 shows the cooling used in the air conditioner according to the present invention. Is a diagram illustrating a fifth embodiment of a cycle, FIG. 8 is an explanatory diagram of the opening and closing valve used in a refrigeration cycle of an air conditioner according to the present invention.

  As shown in the figure, the refrigerant circuit used in the air conditioner according to the present invention includes a compressor 1, a condenser (heat exchanger 1) 2, an expansion mechanism 3, an evaporator (heat exchanger 2) 4, and Are formed as a refrigeration cycle in which the refrigerant is sequentially connected, and is configured to circulate the enclosed refrigerant in the compressor 1, and at the outflow side of the condenser (heat exchanger 1) 2, and the evaporator (heat Between the inflow side of the exchanger 2) 4 and / or the suction side of the compressor 1, there is provided a bypass passage 6 provided in parallel with on-off valves 5 and 5 ′ that open and close by a predetermined pressure.

  By the above-described refrigeration cycle, the low-temperature and low-pressure refrigerant evaporates (vaporizes) in the evaporator (heat exchanger 2) 4 on the indoor side, thereby cooling the evaporator (heat exchanger 2) 4 and surroundings. While the room temperature of the air-conditioned room is reduced by absorbing the heat of the air, hot refrigerant circulates in the condenser (heat exchanger 1) 2 outside the room and heat is released to the outside. Yes.

  At that time, the refrigerant discharge temperature by the high-pressure side pressure / compressor rises under high load operation conditions such as a high temperature of the condenser due to an increase in the outside air temperature, and the compressor 1 and the condenser (heat Since the exchanger 1) 2 and the like may be damaged, the bypass path 6 including the on-off valves 5 and 5 ′ is provided.

The bypass passage 6 including the on-off valves 5 and 5 ′ will be described in detail based on FIG. 1A and FIG.
As shown in FIG. 1 (A) as a first example of the refrigeration cycle used in the air conditioner according to the present invention, between the outflow side of the condenser 2 and the inflow side of the evaporator 4. A bypass path 6 is provided that includes on-off valves 5 and 5 ′ opened and closed in parallel by a predetermined pressure.

  By using the on-off valves 5 and 5 'in parallel, a sufficient release amount is secured even when the refrigerant circulation amount increases, and the release amount responds quickly to a sudden increase in high-pressure pressure.・ A safe refrigeration cycle can be realized.

  Thereby, for example, even when a malfunction occurs in a certain on-off valve, a serious accident can be prevented by the other on-off valve working. Further, by bypassing the refrigerant released from the on-off valves 5 and 5 ′ upstream of the evaporator, a cooling effect by the bypassed refrigerant can be obtained. Therefore, even when the on-off valves 5 and 5 ′ are operated. The cooling capacity can be secured.

  Further, as shown in FIG. 1B as a second example of the first embodiment, a bypass path 6 having an on-off valve 5 between the outflow side of the condenser 2 and the suction side of the compressor 1 is provided. In addition to the above, the bypass passage 6 is provided with another on-off valve 5 ′ in parallel with the on-off valve 5.

  Thereby, since the refrigerant released from the on-off valves 5 and 5 ′ is bypassed to the upstream side (suction side) of the compressor 1, the cooling effect of the compressor 1 by the bypassed refrigerant is obtained. It becomes possible to quickly cool the compressor 1 that has become high temperature at the time of release, and the effect of preventing burnout is improved.

Next, a third example shown in FIG. 2A will be described as Example 2 of the refrigeration cycle used in the air conditioner according to the present invention.
Between the outflow side of the condenser 2, the inflow side of the evaporator 4, and the compressor 1, bypass passages 6 each having an on-off valve 5 are provided.

  Thus, the refrigerant released from the on-off valve 5 is bypassed to the upstream side (inflow side) of the evaporator 4 and the upstream side (suction side) of the compressor 1, thereby The cooling effect and the cooling effect of the compressor 1 can be made compatible.

  Further, in the fourth example shown in FIG. 2B as the second embodiment, the expansion mechanisms 3 and 3 ′ are disposed between the outflow side of the condenser 2 and the inflow side of the evaporator 4 via the distributor 7. And a plurality of branch pipes b provided with on-off valves 5 and 5 'corresponding to the branch pipe a.

  Thus, by using the distributor 7, the refrigerant at the time of release from the on-off valves 5 and 5 'can be smoothly distributed, leading to improved performance. In addition, a refrigeration cycle can be performed without using a special pipe such as a T-shaped tube or a junction for joining the inlet side of the evaporator 4 to the discharge side of the expansion mechanisms 3 and 3 'and the outlet side of the bypass passage 6. It becomes possible to construct, and this can contribute to cost reduction and man-hour reduction.

  As shown in FIG. 3, the distributor 7 is configured to have a function as a dryer by containing a desiccant 7 a (for example, molecular sieve) inside, and moisture contained in the refrigerant. Then, the refrigerant is distributed toward the expansion mechanisms 3 and 3 ′ and the on-off valves 5 and 5 ′.

Next, a fifth example shown in FIG. 4A will be described as a third embodiment of the refrigerant circuit used in the air conditioner according to the present invention.
A bypass path 6 having an on-off valve 5 is provided between the outflow side of the condenser 2 and the inflow side of the evaporator 4, and the discharge temperature of the refrigerant discharged from the compressor 1 is measured by a temperature sensor 8. The on-off valve 5 is opened when detected and at a predetermined temperature or higher.

  Thereby, the discharge temperature of the refrigerant discharged from the compressor 1 is detected by the temperature sensor 8, and the opening / closing valve 5 is opened above a predetermined temperature, so that the discharge temperature of the refrigerant discharged from the compressor 1 in particular is reduced. Since the rise can be suppressed and the refrigerant released from the on-off valve 5 is bypassed to the upstream side (inflow side) of the evaporator 4, the cooling effect by the bypassed refrigerant can be obtained. The cooling capacity can be secured even when the on-off valve 5 is operated.

  Further, in the sixth example shown in FIG. 4B as Example 3, a bypass path 6 having an on-off valve 5 is provided between the outflow side of the condenser 2 and the suction side of the compressor 1. The temperature of the refrigerant discharged from the compressor 1 is detected by a temperature sensor 8, and the on-off valve 5 is opened at a predetermined temperature or higher.

  As a result, the temperature of the refrigerant discharged from the compressor 1 is detected by the temperature sensor 8, and the on-off valve 5 is opened at a predetermined temperature or higher, whereby the refrigerant circuit is connected to the evaporator 4 and the compressor 1. Therefore, the discharge temperature of the refrigerant discharged from the compressor 1 can be lowered more quickly than the refrigerant circuit diagram shown in FIG.

  As shown in FIG. 5, the on-off valve 5 includes a reflecting plate 5a having a valve 5d in the flow path between the inlet 5e into which the refrigerant flows and the outlet 5f through which the refrigerant flows, a diaphragm 5c, the reflecting plate 5a and the diaphragm 5c, And a connecting rod 5b for connecting the two, and is connected to the temperature sensor 8.

  The temperature sensor 8 includes a temperature sensing part in which the same kind of refrigerant is sealed, and a pipe 9 that connects the opening / closing valve 5 including the temperature sensing part and the release valve. The temperature of the temperature sensing part increases. The open / close valve 5 made of the release valve is opened by the increased internal pressure, whereby the open / close valve 5 made of the release valve is accurately adjusted in accordance with the refrigerant temperature discharged from the compressor 1. Can be opened.

  When the above-described refrigeration cycle is used in, for example, an integrated air conditioner, the refrigerant leakage amount from the release valve is reduced even when the condensation pressure increases due to a decrease in the rotational speed of the indoor fan. The efficiency is not impaired, and the release valve is not cooled by the leaking refrigerant, so that frost and dew are not attached, and the durability of the release valve is improved.

  In addition, since there is less refrigerant leakage (flow) near the user, vibration and noise that cause problems do not occur, and the problem of noise and vibration generated at the release valve during release operation due to refrigerant leakage is solved. become able to.

  Further, since the leakage is reduced, the air conditioner having the above-described refrigeration cycle can be stably operated, so that the product development period can be shortened.

  The plurality of on-off valves 5 include the release valves that are operated by pressure on the inlet side, and are configured to be operated by different pressures so that the release valves are operated at arbitrary pressures. It becomes possible to set. Therefore, it is possible to freely set the entire refrigerant release characteristic at an arbitrary pressure, and a design corresponding to safety and stability as a refrigeration cycle is possible.

  Since the release valves are configured to have different flow rates, it is possible to arbitrarily set the release amount of each release valve, and thus it is possible to freely set the total refrigerant release amount. The corresponding design is possible due to the safety and stability of the refrigeration cycle.

  Further, by adopting a configuration in which the expansion mechanisms 3 and 3 'are made of capillary tubes, a stable refrigeration cycle can be realized at low cost by the self-adjusting function of the refrigerant flow rate and pressure by the capillaries.

  In addition, since the expansion mechanisms 3 and 3 ′ are configured by electronic expansion valves, the refrigerant throttle amount can be freely adjusted within a certain range, and a safer, more stable and more efficient refrigeration cycle can be achieved. Can be realized.

Next, the 7th example shown in Drawing 6 (A) is explained as Example 4 of the refrigerating cycle used for the air harmony machine by the present invention.
The condenser 2 is divided into a first condenser 2a and a second condenser 2b, and an on-off valve 5 comprising a release valve between the divided pipe connection portion and the expansion mechanism 3 and the evaporator 4 is provided. It is the structure by which the bypass path 6 provided with is provided.

  As a result, during the operation of the release valve, the refrigerant flows mainly toward the bypass passage 6 in the order of the compressor 1, the first condenser 2a, the bypass passage 6, and the evaporator 4. In the bypass passage 6, the refrigerant flows in the order of the outlet of the first condenser 2 a, the second condenser 2 b, the expansion mechanism 3, and the evaporator 4 in this order mainly toward the expansion mechanism 3. As a result, there is an effect of suppressing a decrease in refrigeration capacity and an increase in power consumption.

  Further, since the refrigerant in the expansion mechanism 3 is a part having a particularly high density in the entire refrigeration cycle, the density of the refrigerant in the entire bypass passage 6 is determined by the refrigerant circuit (compressor, compressor) before the operation of the release valve. The refrigerant density in the entire condenser, expansion mechanism and evaporator) is low.

  As a result, the apparent charge amount of the refrigerant is reduced, so that the high pressure side pressure can be lowered while keeping the low pressure side pressure low, which causes a decrease in heat exchange amount due to a reduction in the temperature difference between the refrigerant and air. It is possible to suppress a decrease in the refrigerating capacity, and to suppress liquid compression.

  Further, since an increase in the amount of refrigerant circulation during the operation of the release valve can be suppressed, an increase in power consumption can also be suppressed. When the release valve is operated, the expansion mechanism 3 functions as a refrigerant escape tank.

  Further, in the eighth example shown in FIG. 6B as the fourth embodiment, the condenser 2 is divided into a first condenser 2a and a second condenser 2b and connected by piping, and the evaporator 4 is divided into a first evaporator 4a and a second evaporator 4b and connected to each other by piping, and a bypass passage 6 having the on-off valve 5 formed of a release valve is provided between the divided pipe connecting portions. It is the composition that is made.

  In the seventh example described above based on FIG. 6A, the evaporator 4 has a larger capacity than the capacity of the first condenser 2a, and the refrigerant temperature on the discharge side of the compressor 1 is It is possible that it will rise. Therefore, in the eighth example described above based on FIG. 6B, the evaporator 4 is replaced with the first evaporator 4a so that the rise in the refrigerant temperature on the discharge side of the compressor 1 can be suppressed. The second evaporator 4b is divided.

  As a result, the outlet of the bypass passage 6 is installed in the middle of the evaporator 4, so that the effect of suppressing the degree of refrigerant superheating at the suction portion of the compressor 1 is exhibited.

Next, a seventh example shown in FIG. 7 will be described as a fifth embodiment of the refrigerant circuit used in the air conditioner according to the present invention.
The condenser 2 is divided into a first condenser 2a and a second condenser 2b, and a bypass passage 6 having an opening / closing valve 5 on the divided pipe connection part and the inflow side of the evaporator 4 is provided. In addition to being provided, the temperature of the refrigerant discharged from the compressor 1 is detected by a temperature sensor 8, and the on-off valve 5 is opened at a predetermined temperature or higher.

  Thereby, the discharge temperature of the refrigerant discharged from the compressor 1 is detected by the temperature sensor 8, and the on-off valve 5 is opened at a predetermined temperature or higher, thereby detecting the discharge temperature of the refrigerant from the compressor 1. Since the release operation is performed, the response to the increase in the discharge temperature becomes faster. Therefore, due to an increase in the cooling load, the suction refrigerant superheat degree of the compressor 1 increases or the discharge temperature of the compressor 1 increases. The configuration is suitable for use in areas that are prone to occur.

  As shown in FIG. 8, the on-off valve 5 used in the refrigeration cycle described with reference to FIGS. 6 (A) and 6 (B) and FIG. 7 includes an inlet 5e through which a refrigerant flows and an outlet 5f through which the refrigerant flows out. A compression spring 5g, a spherical valve 5j, a connecting rod 5h for connecting the compression spring 5g and the valve 5j, and an outer diameter portion of the connecting rod 5h to prevent the refrigerant from entering. It is the structure which consists of a release valve provided with the provided bellows 5i.

  Due to the high pressure applied to the inlet 5e of the release valve, the compression spring 5g is contracted to open the valve 5j. Since the release operation is performed by detecting the pressure at the inlet 5e, the response to the pressure rise is fast, and therefore the structure is suitable for use in an area where the pressure rise is likely to occur due to corrosion or contamination of the heat exchanger.

It is a figure which shows the 1st Example of the refrigerating cycle used for the air conditioner by this invention, (A) shows a 1st example, (B) shows a 2nd example. It is a figure which shows the 2nd Example of the refrigerating cycle used for the air conditioner by this invention, (A) shows a 3rd example, (B) shows a 4th example. It is explanatory drawing of the divider | distributor used for the refrigerating cycle of a 4th example. It is a figure which shows the 3rd Example of the refrigerating cycle used for the air conditioner by this invention, (A) shows a 5th example, (B) shows a 6th example. It is explanatory drawing of the on-off valve and temperature sensor which are used for the refrigerating cycle of the air conditioner by this invention. It is a figure which shows the 4th Example of the refrigerating cycle used for the air conditioner by this invention, (A) shows a 7th example, (B) shows an 8th example. It is a figure which shows the 5th Example of the refrigerating cycle used for the air conditioner by this invention. It is explanatory drawing of the on-off valve used for the refrigerating cycle of the air conditioner by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 2a 1st condenser 2b 2nd condenser 2c Pipe connection part 3, 3 'Expansion mechanism 4 Evaporator 4a 1st evaporator 4b 2nd evaporator 4c Pipe connection part 5, 5 'On-off valve 6, 6' Bypass passage 7 Distributor 7a Desiccant 8 Temperature sensor 9 Piping a, b Branch piping

Claims (2)

In an air conditioner comprising a refrigeration cycle in which a compressor, a condenser, an expansion mechanism, and an evaporator are sequentially connected,
The condenser is divided into a first condenser and a second condenser, and a predetermined interval is provided between the first condenser and the second condenser and between the expansion mechanism and the evaporator. An air conditioner provided with a bypass passage having an on-off valve that opens and closes by the pressure of the air. In an air conditioner comprising a refrigeration cycle in which a compressor, a condenser, an expansion mechanism, and an evaporator are sequentially connected,
The condenser is divided into a first condenser and a second condenser, and the evaporator is divided into a first evaporator and a second evaporator, and the first condenser And a bypass path having an on-off valve that opens and closes at a predetermined pressure between the second condenser and between the first evaporator and the second evaporator. Air conditioner to do.

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