JP5555029B2 - Heat pump equipment - Google Patents

Description

  The present invention provides a refrigerant circuit that circulates the refrigerant in the order of a compressor that compresses the refrigerant, a condenser that dissipates heat from the refrigerant, an expansion valve that expands the refrigerant, and an evaporator that receives heat from the heat-receiving gas. The present invention relates to a compression-type heat pump device.

  In the heat pump device as described above, for example, an evaporator is installed outdoors, air such as outside air as a heat receiving target gas is passed through the evaporator, and heat is exchanged between the refrigerant and the air so that the refrigerant has air. The heat is received, and the received heat is radiated by the condenser. And the heat dissipation object in a condenser is made into water, for example, and warm water is produced | generated by heating water by the heat dissipation. Thus, the heat pump device according to the present invention is used as a small heat pump device that generates hot water using heat pumped from air such as outside air.

  In the conventional heat pump device, the flow path through which the refrigerant flows at a location before the evaporator is divided into two flow paths, a first flow path and a second flow path, by a distribution unit. The evaporator includes a first dividing unit in which the first flow path is disposed and the refrigerant in the first flow path receives heat from the heat receiving target gas, and the second flow path is disposed in the refrigerant in the second flow path. Is divided into a second divided portion that receives heat from the heat receiving target gas (see, for example, Patent Document 1). Thus, by dividing the flow path through which the refrigerant flows in the evaporator into the first flow path and the second flow path, the length of one flow path through which the refrigerant flows in the evaporator is increased. Therefore, it is possible to reduce the pressure loss on the refrigerant side in the evaporator.

  And in the apparatus of patent document 1, in order to prevent that the ratio of a gas-liquid arises with the refrigerant | coolant of a 1st division part, and the refrigerant | coolant of a 2nd division part, a 1st flow path and a 2nd flow path A gas vent pipe that bypasses the gas content of the refrigerant immediately before being split into the first outlet and the second outlet at a lower dryness or the like, or the first flow path and the second flow path, A liquid drain pipe is provided for bypassing the liquid content of the refrigerant immediately before being divided into the first and second divided sections to the outlet or the like on the higher dryness side.

Japanese Patent Laid-Open No. 8-195877

  In the evaporator as described above, the air and the refrigerant are heated in each of the first division unit and the second division unit by passing air such as outside air as the heat receiving gas through the first division unit and the second division unit. The refrigerant receives heat from the air. At this time, if the ventilation resistance is increased due to, for example, frost formation in either the first division unit or the second division unit, the air flow is biased between the first division unit and the second division unit. When the air flow is biased, the amount of heat received by the refrigerant is reduced and the outlet temperature of the refrigerant is reduced on the one of the first and second divided parts. Thus, when the refrigerant temperature at the outlet of the evaporator decreases, the refrigerant temperature supplied to the compressor also decreases, and the difference between the saturation temperature and the actual suction temperature with respect to the compressor suction pressure becomes smaller. A certain electronic expansion valve is controlled to the closed side, and the control works so as to reduce the circulation amount of the refrigerant in the refrigerant circuit, lower the evaporation temperature, and reduce the evaporation heat load. However, even if such control works, the bias of the air flow will not be eliminated, and further, the control works to lower the evaporation temperature by reducing the circulation amount of the refrigerant in the refrigerant circuit, and the evaporation temperature gradually decreases. Go. Then, frosting proceeds with a decrease in the evaporation temperature, and the progress of the frosting further causes a bias in the air flow. In this way, a vicious circle is created in which the deviation of the air flow → decrease of the evaporation temperature → the progress of frost formation → the deviation of the air flow is repeated. In such a vicious circle, as shown in FIG. 4, the opening degree of the electronic expansion valve is gradually adjusted to a smaller side, and the refrigerant of the refrigerant after the first flow path and the second flow path are merged. The temperature will gradually decrease. And, the fact that the refrigerant temperature of the refrigerant after the first flow path and the second flow path are reduced indicates that the evaporator is not receiving sufficient heat from the air. If it falls into a vicious circle, the amount of heat received by the refrigerant from the air in the evaporator will decrease, and the performance as a heat pump device will decrease.

As described above, when there is a bias in the air flow, the refrigerant outlet temperature decreases in one of the first and second divided parts, so the refrigerant temperature at the outlet of the first divided part and the second divided part are reduced. A temperature difference is produced between the refrigerant temperature at the outlet of the part. In the apparatus described in Patent Document 1, when such a temperature difference occurs, the gas component of the refrigerant is bypassed to the outlet or the like on the smaller dryness side between the first divided portion and the second divided portion by the gas vent pipe. Alternatively, the liquid component of the refrigerant is bypassed to the outlet or the like on the larger dryness side between the first divided portion and the second divided portion by the liquid drain pipe. Therefore, the temperature difference between the refrigerant temperature at the outlet of the first divided portion and the refrigerant temperature at the outlet of the second divided portion is eliminated, and the above-described vicious circle can be prevented.
However, in the apparatus described in Patent Document 1, the refrigerant gas is bypassed by the gas vent pipe or the refrigerant liquid is bypassed by the liquid vent pipe, so that the amount of refrigerant supplied to the evaporator is reduced. Become. Accordingly, the amount of heat received from the air in the evaporator decreases with a decrease in the supply amount of the refrigerant, so that the performance of the heat pump device is eventually reduced.

  In particular, the heat pump device according to the present invention is used as a small heat pump device as described above, but in such a small heat pump device, from the viewpoint of installation space and cost, a compressor, a condenser, An expansion valve, an evaporator, a distribution unit, and the like are required to be contained in one package. Therefore, in the evaporator, a large heat receiving surface that receives heat from the heat receiving target gas cannot be taken, and the size of the heat receiving surface is limited. Therefore, as in the apparatus described in Patent Document 1, when the amount of refrigerant supplied to the evaporator is reduced, a sufficient heat receiving amount cannot be secured on a limited heat receiving surface, and the problem of performance deterioration is significant. It becomes.

  The present invention has been made paying attention to such points, and its purpose is to provide a flow of the heat-receiving target gas even when there is a bias in the flow of the heat-receiving target gas between the first divided portion and the second divided portion. The object of the present invention is to provide a heat pump device that can eliminate the unevenness and prevent performance degradation.

In order to achieve this object, the heat pump device according to the present invention includes a compressor that compresses a refrigerant, a condenser that dissipates heat from the refrigerant, an expansion valve that expands the refrigerant, and the refrigerant that heats the heat-receiving gas. In a compression heat pump device provided with a refrigerant circuit for circulating the refrigerant in the order of the evaporator receiving the
The refrigerant circuit is divided into a first flow path and a second flow path before the evaporator by a distribution unit, and the first flow path and the second flow path that have passed through the evaporator can be joined together freely. The evaporator is configured such that the first flow path is disposed, the first divided portion that receives heat from the heat receiving target gas, and the second flow path is disposed in the first flow path. The refrigerant in the second flow path is divided into a second divided portion that receives heat from the heat receiving target gas, and ventilation means that allows the heat receiving target gas to flow through the first divided portion and the second divided portion, A ventilation state adjusting means capable of adjusting a ventilation state of the heat reception target gas to the one division part and a ventilation state of the heat reception target gas to the second division part ;
A first refrigerant temperature detecting means for detecting the temperature of the refrigerant that has passed through the first dividing portion; and a second refrigerant temperature detecting means for detecting the temperature of the refrigerant that has passed through the second dividing portion; Based on the detection information of the first refrigerant temperature detecting means and the second refrigerant temperature detecting means, the adjusting means selects the side of the first dividing section and the second dividing section where the temperature of the refrigerant that has passed is higher. Adjusting the ventilation state of the heat-receiving target gas to the first division unit and the ventilation state of the heat-receiving target gas to the second division unit so as to reduce the ventilation amount of the heat-receiving target gas with respect to the lower side There is in point to do.

According to this characteristic configuration, the evaporator is divided into the first divided portion and the second divided portion, and the heat receiving target gas (for example, outside air) is ventilated in the first divided portion and the second divided portion by the operation of the ventilation means. Therefore, in each of the first division unit and the second division unit, the refrigerant receives the heat of the heat reception target gas.
As described above, the gas to be heat-received is ventilated to the first division unit and the second division unit by the operation of the ventilation unit. For example, the first division is performed by increasing the ventilation resistance due to frost formation or the like in the second division unit. There is a possibility that the heat receiving target gas flows more easily in the part than in the second divided part, and the flow of the heat receiving target gas may be biased between the first divided part and the second divided part.
Therefore, according to this characteristic configuration, the ventilation state adjusting means is provided which can adjust the ventilation state of the heat receiving target gas to the first division part and the ventilation state of the heat reception target gas to the second division part. The state adjusting means can adjust the ventilation state so that, for example, the first divided portion has a smaller amount of ventilation of the heat receiving target gas than the second divided portion. Therefore, even if the flow of the heat receiving target gas is unbalanced between the first dividing unit and the second dividing unit, the ventilation state adjusting means is directed to the first dividing unit so as to eliminate the uneven flow of the heat receiving target gas. It is possible to adjust the ventilation state of the heat receiving target gas and the ventilation state of the heat receiving target gas to the second divided portion. Thereby, even if the deviation of the flow of the heat receiving target gas occurs in the first division part and the second division part, the deviation of the flow of the heat receiving target gas is eliminated, and the deviation of the flow of the heat reception target gas is continued. Therefore, it can prevent falling into the situation where the performance of a heat pump apparatus falls.

  From the above, even if the flow of the heat receiving target gas is uneven in the first divided portion and the second divided portion, the heat pump that can eliminate the uneven flow of the heat receiving target gas and prevent the performance deterioration. A device can be realized.

  As described in the section of the problem to be solved by the invention, when a deviation occurs in the flow of the heat receiving target gas between the first divided unit and the second divided unit, the heat receiving unit of the first divided unit and the second divided unit receives heat. The outlet temperature of the refrigerant is lowered on the side where the air flow rate of the target gas is reduced, and a temperature difference is generated between the refrigerant temperature at the outlet of the first divided portion and the refrigerant temperature at the outlet of the second divided portion. And since the exit temperature of a refrigerant | coolant falls in the side in which the ventilation volume of the heat receiving object gas decreased among the 1st division part and the 2nd division part, among the 1st division part and the 2nd division part, the refrigerant of It is considered that there is a bias in the flow of the heat receiving target gas that the heat receiving target gas flows more easily on the side having the higher outlet temperature than on the side having the lower outlet temperature.

  Therefore, according to this characteristic configuration, the first refrigerant temperature detecting means for detecting the temperature of the refrigerant that has passed through the first dividing section, and the second refrigerant temperature detecting means for detecting the temperature of the refrigerant that has passed through the second dividing section, The ventilation state adjusting means is based on the detection information of the first refrigerant temperature detecting means and the second refrigerant temperature detecting means, and the temperature of the refrigerant that has passed through is higher on the side of the first dividing section and the second dividing section. The ventilation state of the heat reception target gas to the first division unit and the ventilation state of the heat reception target gas to the second division unit are adjusted so as to reduce the ventilation amount of the heat reception target gas to the lower side. By adjusting the ventilation state in this way, the change in the outlet temperature of the refrigerant due to the deviation of the flow of the heat-receiving target gas in the first divided portion and the second divided portion is accurately captured, and the flow of the heat-receiving target gas Therefore, it is possible to appropriately adjust the ventilation state of the heat reception target gas to the first division unit and the ventilation state of the heat reception target gas to the second division unit so as to eliminate the bias. Therefore, while it is possible to accurately grasp that the flow of the heat receiving target gas is caused by the first divided portion and the second divided portion, it is possible to appropriately eliminate the uneven flow of the heat receiving target gas.

  A further characteristic configuration of the heat pump device according to the present invention is that the first divided portion and the second divided portion are arranged in a state of being vertically divided at an intermediate portion in the vertical direction of the evaporator, and the ventilation state adjustment The means is disposed at an intermediate portion in the vertical direction of the evaporator and has a first position that regulates a flow of the heat receiving target gas that is ventilated to the first division part and the heat reception target that is ventilated to the second division part. The position change member is provided with a position changeable member at the second position for restricting the gas flow.

According to this characteristic configuration, when the position changing member arranged in the middle part in the vertical direction of the evaporator is positioned at the first position, the flow of the heat receiving target gas that is ventilated by the position changing member to the first divided part. The ventilation resistance increases by the regulation. Therefore, the heat receiving target gas is more likely to be ventilated to the second divided part than the first divided part, and the first divided part is made to reduce the ventilation amount of the heat receiving target gas to the second divided part. The ventilation state of the heat receiving target gas to the division part and the ventilation state of the heat reception target gas to the second division part can be adjusted. Further, when the position changing member is positioned at the second position, the second divided portion is made to decrease the ventilation amount of the heat receiving target gas with respect to the first divided portion, similarly to when the position changing member is positioned at the first position. Moreover, the ventilation state of the heat receiving target gas to the first division part and the ventilation state of the heat receiving target gas to the second division part can be adjusted.
In this way, by the easy operation of changing the position changing member between the first position and the second position, the state of ventilation of the heat receiving target gas to the first division part and the ventilation of the heat receiving target gas to the second division part The state can be adjusted appropriately, and the configuration of the ventilation state adjusting means can be simplified.

  The heat pump device according to the present invention is further characterized in that the evaporator is formed by penetrating a heat transfer tube through which the refrigerant flows through a plurality of heat transfer fins, and the first divided portion and the second divided portion. Are arranged in a state of being vertically divided at an intermediate portion in the vertical direction of the evaporator, each of the first divided portion and the second divided portion includes a refrigerant evaporation portion for evaporating the refrigerant, and A refrigerant superheating section that superheats the refrigerant that has passed through the refrigerant evaporation section, and the heat transfer tube is configured so that the refrigerant evaporation section is arranged in the vertical direction of the evaporator in each of the first division section and the second division section. The heat transfer tube is disposed on the intermediate side, and the refrigerant superheater is disposed closer to the end of the evaporator in the vertical direction than the refrigerant evaporator, and is arranged in a state in which the heat receiving target gas is lined up The refrigerant is more than the refrigerant evaporating part In that it is arranged such towards the heat portion is increased.

According to this feature configuration, since each of the first dividing unit and the second dividing unit includes the refrigerant evaporation unit and the refrigerant superheating unit, the refrigerant supplied to the evaporator is In each of the second divided parts, the refrigerant evaporates through the refrigerant evaporating part, is continuously supplied to the refrigerant superheated part, is superheated through the refrigerant superheated part, and the refrigerant can be appropriately evaporated and superheated.
And according to this characteristic configuration, the positional relationship between the refrigerant evaporating part and the refrigerant superheating part in the vertical direction of the evaporator and the number of the refrigerant evaporating parts and the refrigerant superheating part of the number of heat transfer tubes arranged in the ventilation direction of the heat receiving target gas. Regarding the magnitude relationship, in each of the first and second divided parts, the refrigerant evaporation part is arranged on the intermediate part side in the vertical direction of the evaporator, and the refrigerant superheating part is arranged in the vertical direction of the evaporator rather than the refrigerant evaporation part. The heat transfer tubes are arranged on the end side so that the number of heat transfer tubes arranged in a state in which the heat receiving target gas is lined up is larger in the refrigerant overheating portion than in the refrigerant evaporation portion.

  As described above, the heat transfer tubes are arranged in the first divided portion and the second divided portion so that a plurality of heat transfer tubes are arranged in the ventilation direction of the heat receiving target gas, but the number of the heat transfer tubes is arranged. Is configured such that there are more refrigerant overheating parts than refrigerant evaporating parts. Thereby, since the refrigerant | coolant overheating part becomes larger the ventilation resistance of heat receiving object gas than a refrigerant | coolant evaporation part, heat receiving object gas becomes easy to ventilate with respect to a refrigerant | coolant evaporation part rather than a refrigerant | coolant overheating part. As a result, it is possible to secure a sufficient amount of ventilation as the amount of ventilation of the heat receiving target gas in the refrigerant evaporating unit, so that it is possible to prevent frost formation in the refrigerant evaporating unit. On the other hand, the amount of ventilation of the heat receiving target gas in the refrigerant superheated portion tends to decrease, but the refrigerant flowing through the refrigerant superheated portion is a refrigerant that has evaporated in the refrigerant evaporating portion and increased in temperature. Even if the air flow rate is reduced, it is possible to prevent frost formation in the refrigerant overheating portion. Therefore, it is possible to prevent the progress of frost formation in both the refrigerant evaporating part arranged on the intermediate side in the vertical direction of the evaporator and the refrigerant overheating part arranged on the upper end side or the lower end side in the vertical direction of the evaporator. It is possible to appropriately prevent the progress of frost formation in the entire evaporator. As a result, it is possible to prevent a situation in which the flow of the heat receiving target gas is biased between the first divided portion and the second divided portion due to frost formation.

  A further characteristic configuration of the heat pump device according to the present invention is a first refrigerant temperature detecting means for detecting the temperature of the refrigerant that has passed through the first dividing section, and a first detector that detects the temperature of the refrigerant that has passed through the second dividing section. 2 refrigerant temperature detecting means, and a post-merging refrigerant temperature detecting means for detecting the temperature of the refrigerant after the first flow path and the second flow path are merged, and detected by the first refrigerant temperature detecting means. If the refrigerant temperature on the lower side of the refrigerant temperature detected by the second refrigerant temperature detecting means and the refrigerant temperature detected by the post-merging refrigerant temperature detecting means are equal to each other, A closing side control prohibiting means for prohibiting the control to the closing side is provided.

As described in the column of the problem to be solved by the invention, when the flow of the heat receiving target gas is biased between the first divided portion and the second divided portion, the refrigerant temperature at the outlet of the evaporator decreases, and the compressor The refrigerant temperature supplied to the compressor also decreases, and the difference between the saturation temperature with respect to the compressor suction pressure and the actual suction temperature is reduced, so the electronic expansion valve, which is the expansion valve, is controlled to the closed side, and the amount of refrigerant circulating in the refrigerant circuit The control works to reduce the evaporation temperature and reduce the evaporation heat load. If such control is repeatedly performed without eliminating the bias in the flow of the heat receiving target gas in the first split portion and the second split portion, the flow in the heat receiving target gas is uneven, the evaporation temperature is lowered, and the arrival is reached. Progression of frost → A vicious cycle in which the flow of the heat reception target gas is repeated causes a reduction in the amount of heat received by the refrigerant from the heat reception target gas in the evaporator.
Therefore, according to this characteristic configuration, the refrigerant temperature on the lower side of the refrigerant temperature detected by the first refrigerant temperature detection means and the refrigerant temperature detected by the second refrigerant temperature detection means and the combined refrigerant temperature detection means When the refrigerant temperature detected in this way is the same, a closing-side control prohibiting means for prohibiting control of the expansion valve to the closing side is provided. By providing this closing side control prohibiting means, even if the flow of the heat receiving target gas is unbalanced between the first dividing unit and the second dividing unit, and the refrigerant temperature at the outlet of the evaporator decreases, the expansion valve Since it is possible to prohibit a certain electronic expansion valve from being controlled to the closed side, it is possible to avoid a vicious circle as described above, and to appropriately prevent a decrease in the amount of heat received by the refrigerant from the heat receiving target gas in the evaporator.

Schematic configuration diagram of a heat pump device according to the present invention An enlarged perspective view of a part of the evaporator The heat pump apparatus which concerns on this invention WHEREIN: The graph which shows the change with the passage of time of the refrigerant temperature of the refrigerant | coolant after the opening degree of an electronic expansion valve and a 1st flow path and a 2nd flow path merged The graph which shows the change with the passage of time of the refrigerant temperature of the refrigerant | coolant after the opening degree of an electronic expansion valve and the 1st flow path and the 2nd flow path merged in the conventional heat pump apparatus.

An embodiment of a heat pump device according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the heat pump device includes a compressor 1 that compresses the refrigerant R, a condenser 2 that dissipates heat from the refrigerant R, an electronic expansion valve 3 that expands the refrigerant R, and the refrigerant R that receives heat. It is comprised with the compression type heat pump apparatus which provided the refrigerant circuit 5 which circulates the refrigerant | coolant R in order of the evaporator 4 which receives heat from. Moreover, the control part 6 which adjusts the rotational speed of the compressor 1 and the opening degree of the electronic expansion valve 3, and controls the driving | operation of a heat pump apparatus is also provided. Here, as the refrigerant R, for example, R134A is used.

  In this heat pump device, for example, the evaporator 4 is installed outside, the heat receiving target gas in the evaporator 4 is the outside air P, the outside air P is passed through the evaporator 4, and heat exchange is performed between the refrigerant R and the outside air P. As a result, the refrigerant R receives the heat of the outside air P, and the received heat is radiated by the condenser 2. And the heat dissipation object in the condenser 2 is made into water, for example, and warm water is produced | generated by heating water by the heat dissipation. Thus, the heat pump device according to the present invention is used, for example, as a small heat pump device that generates hot water using heat pumped from the outside air P.

  The refrigerant circuit 5 is divided into a first flow path 8 and a second flow path 9 before the evaporator 4 by the distribution unit 7, and passes through the first flow path 8 and the second flow path 9 that have passed through the evaporator 4. It is configured to join freely. In other words, the distribution unit 7 is disposed in front of the part for supplying the refrigerant R to the evaporator 4 in the refrigerant circuit 5, and the downstream side part of the refrigerant R in the flow direction from the distribution part 7 is the first flow path. 8 and the second flow path 9 are branched into two systems. Then, the first flow path 8 and the second flow path 9 are joined and connected at the downstream side of the flow direction of the refrigerant R from the evaporator 4, and the refrigerant of the first flow path 8 that has passed through the evaporator 4. R and the refrigerant R in the second flow path 9 are merged.

In the evaporator 4, a first flow path 8 is disposed, and a refrigerant R in the first flow path 8 receives heat from outside air P as a heat receiving target gas, and a second flow path 9 is disposed. Thus, the refrigerant R in the second flow path 9 is divided into the second divided portion 11 that receives heat from the outside air P. And the 1st division part 10 and the 2nd division part 11 are arranged in the state divided up and down in the middle part of the up-and-down direction of evaporator 4. That is, as shown in FIG. 1, the evaporator 4 is divided into two parts in a vertically adjacent state, the first divided part 10 is arranged on the upper side, and the second divided part 11 is arranged on the lower side. Has been. And the magnitude | size in the up-down direction of the evaporator 4 is comprised so that the 1st division part 10 and the 2nd division part 11 may become the same.
Further, a suction-type ventilation fan 12 (corresponding to a ventilation means) that allows the outside air P to pass through the first division unit 10 and the second division unit 11 is provided, and the operation to the first division unit 10 is performed by the ventilation fan 12. The ventilation amount of the outside air P and the ventilation amount of the outside air P to the 2nd division part 11 are constituted so that it may become almost the same amount.

  As shown in FIG. 2, the evaporator 4 is configured by penetrating a plurality of heat transfer fins 13 through heat transfer tubes 14 that allow the refrigerant R to flow therethrough. Here, FIG. 2 shows only the first dividing unit 10 among the evaporators 4 divided into the first dividing unit 10 and the second dividing unit 11. A plurality of the heat transfer fins 13 are arranged at intervals in the horizontal direction in a posture along the ventilation direction of the outside air P, and the outside air P is configured to flow between the heat transfer fins 13. The heat transfer tube 14 passes through the plurality of heat transfer fins 13, extends from one end side in the horizontal direction to the other end side, and is folded back at the other end portion in the horizontal direction. It is arranged so as to pass through and extend from the other end side in the horizontal direction to one end side. In this way, the heat transfer tubes 14 are arranged in a horizontal posture along the horizontal direction.

  Returning to FIG. 1, each of the first dividing unit 10 and the second dividing unit 11 includes a refrigerant evaporating unit 15 that evaporates the refrigerant R, and a refrigerant superheating unit 16 that superheats the refrigerant R that has passed through the refrigerant evaporating unit 15. Is provided. The heat transfer tube 14 is configured such that, in each of the first divided unit 10 and the second divided unit 11, the refrigerant evaporating unit 15 is disposed on the middle side in the vertical direction of the evaporator 4, and the refrigerant superheating unit 16 is disposed in the refrigerant evaporating unit 15. In addition, the heat exchanger tube 14 is arranged on the end side in the vertical direction of the evaporator 4, and a plurality of heat transfer tubes 14 are arranged in the direction of ventilation of the outside air P.

  That is, the heat transfer tubes 14 are formed in a state in which a plurality of rows of heat transfer tubes 14 arranged in the direction of ventilation of the outside air P are formed in a plurality of stages in the vertical direction of the evaporator 4 in each of the first divided unit 10 and the second divided unit 11. It is arranged. Then, the refrigerant R flows through the plurality of heat transfer tubes 14 in the same row aligned in the ventilation direction of the outside air P, and then flows to the heat transfer tubes 14 adjacent in the vertical direction of the evaporator 4. The plurality of heat transfer tubes 14 in the same row lined up in the direction of P flow are passed. The introduction part of the refrigerant R to the first division part 10 and the second division part 11 is arranged in the middle part in the vertical direction of the evaporator 4, and the flow direction of the refrigerant R in the vertical direction of the evaporator 4 is The first dividing unit 10 has a direction from the intermediate part to the upper side, and the second dividing unit 11 has a direction from the intermediate part to the lower side.

  Further, in each of the first dividing unit 10 and the second dividing unit 11, the refrigerant evaporation unit 15 is disposed on the intermediate portion side in the vertical direction of the evaporator 4, and the refrigerant superheating unit 16 is adjacent to the refrigerant evaporation unit 15. It arrange | positions rather than the refrigerant | coolant evaporation part 15 at the edge part side of the evaporator 4 at the up-down direction. Thereby, in each of the first dividing unit 10 and the second dividing unit 11, the refrigerant R introduced by the introducing unit into the middle part in the vertical direction of the evaporator 4 causes the refrigerant evaporating unit 15 to move in the vertical direction of the evaporator 4. The refrigerant is evaporated by flowing from the intermediate part to the end part side, and subsequently supplied to the refrigerant superheating part 16, and the refrigerant superheating part 16 is passed from the intermediate part in the vertical direction of the evaporator 4 to the end part side to be superheated. Here, in the vertical direction of the evaporator 4, the refrigerant evaporating unit 15 is configured to be larger than the refrigerant overheating unit 16, and the refrigerant evaporating unit 15 can appropriately evaporate the refrigerant R.

Thus, although the evaporator 4 is divided | segmented up and down into the 1st division part 10 and the 2nd division part 11, in either the 1st division part 10 or the 2nd division part 11, for example by frosting etc. When the ventilation resistance increases, the flow of the outside air P is biased between the first split portion 10 and the second split portion 11, and there may be a problem due to the bias of the flow of the outside air P.
Therefore, the heat pump device according to the present invention includes the ventilation state adjusting means 17 that can adjust the ventilation state of the outside air P to the first dividing unit 10 and the ventilation state of the outside air P to the second dividing unit 11. When the flow of the outside air P is biased between the first dividing unit 10 and the second dividing unit 11, the ventilation state adjusting means 17 causes the ventilation state of the outside air P to the first dividing unit 10 and the second dividing unit 11. By adjusting the ventilation state of the outside air P, the deviation of the flow of the outside air P between the first dividing unit 10 and the second dividing unit 11 is eliminated.

  The ventilation state adjusting means 17 is disposed at an intermediate portion in the vertical direction of the evaporator 4, and has a first position (see a one-dot chain line in FIG. 1) and a second position that regulate the flow of the outside air P that is ventilated to the first division unit 10. A position changing member 18 is provided that can change its position at a second position (see the dotted line in FIG. 1) that restricts the flow of the outside air P that is ventilated through the dividing portion 11. The position changing member 18 is constituted by a plate-like member that is long in the lateral width direction of the evaporator 4, and the arrangement position in the vertical direction corresponds to the divided portion of the first divided portion 10 and the second divided portion 11. The position of the outside air P in the ventilation direction is a position adjacent to the evaporator 4 on the downstream side of the evaporator 4. And if the position change member 18 is located in a 1st position or a 2nd position, the flow of the external air P which passed the 1st division part 10 or the 2nd division part 11 will be controlled, and the ventilation resistance will be increased. The air volume of the outside air P passing through the first dividing unit 10 or the second dividing unit 11 is reduced. Further, the position changing member 18 swings around the horizontal axis at a first position indicated by a one-dot chain line in FIG. 1, an intermediate position indicated by a solid line in FIG. 1, and a second position indicated by a dotted line in FIG. It is provided freely. Here, the intermediate position is set to a position where the position changing member 18 does not protrude in the vertical direction to both the first divided portion 10 side and the second divided portion 11 side, and assumes a posture along the ventilation direction of the outside air P. ing.

  In the heat pump device according to the present invention, the first refrigerant temperature sensor 19 (corresponding to the first refrigerant temperature detecting means) that detects the temperature of the refrigerant R that has passed through the first division unit 10 and the second division unit 11 have been passed. And a second refrigerant temperature sensor 20 (corresponding to a second refrigerant temperature detection means) that detects the temperature of the refrigerant R, and the detection information of the first refrigerant temperature sensor 19 and the detection information of the second refrigerant temperature sensor 20 are controlled. It is input to part 6. And the control part 6 is based on the detection information of the 1st refrigerant | coolant temperature sensor 19, and the detection information of the 2nd refrigerant | coolant temperature sensor 20, and the position change member 18 in any position of a 1st position, a 2nd position, and an intermediate position. The position change member 18 is configured to control the position change of the position change member 18, and the ventilation state adjusting means 17 includes the position change member 18 and the control unit 16.

  And the control part 6 has the high temperature of the refrigerant | coolant R which passed among the 1st division | segmentation parts 10 and the 2nd division | segmentation part 11 based on the detection information of the 1st refrigerant | coolant temperature sensor 19 and the 2nd refrigerant | coolant temperature sensor 20. The ventilation state of the outside air P to the first division unit 10 and the ventilation state of the outside air P to the second division unit 11 are adjusted so that the ventilation amount of the outside air P is reduced with respect to the lower side.

  For example, when the ventilation resistance of the outside air P increases due to frost or the like in the second division unit 11, the outside air P is more easily ventilated in the first division unit 10 than in the second division unit 11. The flow rate of the outside air P to the air increases, and conversely, the flow rate of the external air P to the second divided portion 11 decreases, and the first divided portion 10 and the second divided portion 11 are biased toward the flow of the external air P. Occurs. Thereby, in the 1st division part 10, although refrigerant R can receive heat from a lot of outside air P, the temperature of refrigerant R which passed the 1st division part 10 becomes high, but in the 2nd division part 11, A sufficient ventilation rate cannot be ensured as the ventilation rate of the outside air P, and the temperature of the refrigerant R that has passed through the second divided portion 11 becomes low. Thus, when the flow of the outside air P is biased between the first dividing unit 10 and the second dividing unit 11, the temperature of the refrigerant R that has passed through the first dividing unit 10 and the refrigerant R that has passed through the second dividing unit 11. There is a temperature difference between And the temperature of the refrigerant | coolant R which passed through the direction where the ventilation volume of the external air P increases among the 1st division | segmentation part 10 and the 2nd division | segmentation part 11 becomes higher than the side where the ventilation volume of the external air P decreases. .

  Therefore, the control unit 6 compares the refrigerant temperature T1 detected by the first refrigerant temperature sensor 19 with the refrigerant temperature T2 detected by the second refrigerant temperature sensor 20, and the refrigerant temperature T1 is more than the refrigerant temperature T2. If it is higher, the position changing member 18 is changed to the first position (see the one-dot chain line in FIG. 1). Further, when the refrigerant temperature T2 is higher than the refrigerant temperature T1, the controller 6 changes the position changing member 18 to the second position (see the dotted line in FIG. 1), and the refrigerant temperature T1 and the refrigerant temperature T2 are changed. If they are equal, the position changing member 18 is changed to an intermediate position (see a solid line in FIG. 1).

  Here, the refrigerant temperature T1 being higher than the refrigerant temperature T2 indicates a case where the refrigerant temperature T1 is higher than the refrigerant temperature T2 by a set range or more, and the refrigerant temperature T2 is higher than the refrigerant temperature T1. Shows a case where the refrigerant temperature T2 is higher than the refrigerant temperature T1 by a set range or more, and the refrigerant temperature T1 and the refrigerant temperature T2 are equivalent, the difference between the refrigerant temperature T1 and the refrigerant temperature T2 is within the set range. Shows the case.

  As shown by the one-dot chain line in FIG. 1, when the position changing member 18 is positioned at the first position, the position changing member 18 regulates the flow of the outside air P that is ventilated to the first dividing portion 10, and the regulation is performed. Ventilation resistance increases. Therefore, the outside air P is more likely to be ventilated to the second dividing unit 11 than the first dividing unit 10, and the first dividing unit 10 is reduced to reduce the ventilation amount of the outside air P with respect to the second dividing unit 11. The ventilation state of the outside air P to the first division unit 10 and the ventilation state of the outside air P to the second division unit 11 can be adjusted. By adjusting the ventilation state in this way, even if the flow of the outside air P is biased such that the outside air P flows more easily in the first dividing section 10 than in the second dividing section 11, the flow of the outside air P Can be eliminated.

  Further, as shown by the dotted line in FIG. 1, when the position changing member 18 is positioned at the second position, the position changing member 18 regulates the flow of the outside air P that is ventilated to the second divided portion 11, Ventilation resistance increases due to regulations. Therefore, the outside air P is more likely to be ventilated to the first dividing unit 10 than the second dividing unit 11, and the second dividing unit 11 is reduced to reduce the ventilation amount of the outside air P with respect to the first dividing unit 10. The ventilation state of the outside air P to the first division unit 10 and the ventilation state of the outside air P to the second division unit 11 can be adjusted. By adjusting the ventilation state in this manner, even if the flow of the outside air P in which the outside air P flows more easily in the second divided portion 11 than in the first divided portion 10, the flow of the outside air P is generated. Can be eliminated.

  Thus, by comparing the refrigerant temperature T1 of the refrigerant R that has passed through the first dividing unit 10 and the refrigerant temperature T2 of the refrigerant R that has passed through the second dividing unit 11, the first dividing unit 10 and the second dividing unit 11 are compared. It is possible to accurately grasp the change in the outlet temperature of the refrigerant accompanying the deviation of the flow of the outside air P. And with respect to the change of the outlet temperature of the refrigerant, the air flow rate of the outside air P is reduced with respect to the lower side of the first divided unit 10 and the second divided unit 11 where the temperature of the refrigerant R that has passed is lower. As described above, by adjusting the ventilation state of the outside air P to the first dividing unit 10 and the ventilation state of the outside air P to the second dividing unit 11, the first dividing unit 10 and the second dividing unit 11 The uneven flow of the outside air P can be appropriately eliminated.

  In the heat pump device according to the present invention, as described above, the heat transfer tubes 14 are arranged so that the plurality of heat transfer tubes 14 are arranged in the ventilation direction of the outside air P in each of the first divided portion 10 and the second divided portion 11. However, the number of the heat transfer tubes 14 is such that the refrigerant superheater 16 (for example, three) is larger than the refrigerant evaporator 15 (for example, two). As a result, the refrigerant overheating portion 16 has a larger ventilation resistance of the outside air P than the refrigerant evaporation portion 15, so that the outside air P is larger than the refrigerant overheating portion 16 than the refrigerant overheating portion 16, as shown by the size of the arrow in FIG. 15 becomes easy to ventilate. As a result, it is possible to secure a sufficient ventilation rate as the ventilation rate of the outside air P in the refrigerant evaporation unit 15, thereby preventing frost formation in the refrigerant evaporation unit 15. On the other hand, the flow rate of the outside air P in the refrigerant overheating portion 16 tends to decrease, but the refrigerant R flowing through the refrigerant overheating portion 16 is the refrigerant R that has been evaporated in the refrigerant evaporation portion 15 and has risen in temperature. Even if the amount of ventilation of the outside air P is reduced, it is possible to prevent frost formation in the refrigerant superheating section 16. Therefore, the frosting progresses even in the refrigerant evaporating unit 15 disposed on the intermediate side in the vertical direction of the evaporator 4 and in the refrigerant superheating unit 16 disposed on the upper end side or the lower end side in the vertical direction of the evaporator 4. Therefore, the progress of frost formation in the entire evaporator 4 can be appropriately prevented. As a result, it is also possible to prevent a situation in which the flow of the outside air P is biased between the first dividing unit 10 and the second dividing unit 11 due to frost formation.

  In the heat pump device according to the present invention, the post-merging refrigerant temperature sensor 21 (corresponding to the post-merging refrigerant temperature detecting means) that detects the temperature of the refrigerant R after the first channel 8 and the second channel 9 merge. And the detection information of the post-merging refrigerant temperature sensor 21 is input to the control unit 6. Then, the control unit 6 compares the refrigerant temperature T1 detected by the first refrigerant temperature sensor 19 with the refrigerant temperature T2 detected by the second refrigerant temperature sensor 20, and after joining the lower refrigerant temperature T1 or T2. If the refrigerant temperature T3 detected by the temperature sensor 21 is equal, the electronic expansion valve 3 is prohibited from being controlled to the closed side, and the circulation amount of the refrigerant R in the refrigerant circuit 5 is reduced. 3 control is prohibited. Thereby, the control part 6 is corresponded to a close side control prohibition means.

  In this way, the first split part 10 and the second split part 11 are biased in the flow of the outside air P, and the refrigerant temperature T3 of the refrigerant R after the first flow path 8 and the second flow path 9 merge together is the same. Since the electronic expansion valve 3 can be prohibited from being controlled to the closed side even if it drops, a vicious circle in which the deviation of the flow of the outside air P → the reduction of the evaporation temperature → the progress of frost formation → the deviation of the flow of the outside air P is repeated. Therefore, it is possible to appropriately prevent a decrease in the amount of heat received by the refrigerant R from the outside air P in the evaporator 4.

  3 and 4, the heat pump device according to the present invention (see FIG. 3) including the ventilation state adjusting means 17 and the control unit 6 which is the closing side control prohibiting means, and the ventilation state adjusting means and the closing side control prohibiting means are shown. About the conventional heat pump apparatus (refer FIG. 4) which is not equipped, the change with the passage of time of the opening temperature of an electronic expansion valve and the refrigerant | coolant temperature of the refrigerant | coolant after a 1st flow path and a 2nd flow path merged is shown. ing.

  As shown in FIG. 4, in the conventional heat pump device, when the flow of the outside air is biased between the first divided portion and the second divided portion, the refrigerant of the refrigerant after joining the first flow path and the second flow path The temperature decreases, and the electronic expansion valve is controlled to the closed side as the refrigerant temperature decreases, and the opening of the electronic expansion valve is adjusted to the small side. Then, as the opening degree of the electronic expansion valve is adjusted to the small side, the circulation amount of the refrigerant decreases, and the refrigerant temperature of the refrigerant after joining the first flow path and the second flow path decreases. Thus, in the conventional heat pump device, the decrease in the refrigerant temperature and the adjustment to the small side of the opening of the electronic expansion valve are repeated, the amount of heat received by the refrigerant from the outside air in the evaporator decreases, and the heat pump device Performance decreases.

  On the other hand, as shown in FIG. 3, in the heat pump device according to the present invention, even if the flow of outside air is uneven in the first divided portion and the second divided portion, the ventilation state is adjusted by the ventilation state adjusting means. Although the deviation of the flow of the outside air between the first divided portion and the second divided portion is eliminated and the refrigerant temperature of the refrigerant after joining the first flow path and the second flow path is somewhat lowered, the conventional heat pump device Thus, the refrigerant temperature does not decrease. Further, since the electronic expansion valve is prohibited from being controlled to the closed side by the closing side control prohibiting means, the electronic expansion valve is maintained at a certain opening. Thereby, the opening degree of the electronic expansion valve is not adjusted to the small side, and the circulation amount of the refrigerant is not reduced. Therefore, the refrigerant temperature of the refrigerant after the first flow path and the second flow path are merged Can be prevented. Therefore, in the heat pump device according to the present invention, it is possible to prevent a decrease in the amount of heat received by the refrigerant from the outside air in the evaporator, and appropriately prevent a performance decrease as the heat pump device.

[Another embodiment]
(1) In the above embodiment, the position changing member 18 is configured by a plate-like member that can swing around the horizontal axis at the first position, the intermediate position, and the second position. For example, in the up-down direction, the first position protruding toward the first dividing portion, the second position protruding toward the second dividing portion, and the intermediate position between the first position and the second position are slid. The position changing member can also be configured by a movable plate-like member. Such a slidable position changing member can be arranged at a position adjacent to the evaporator on the upper side of the evaporator in the ventilation direction of the outside air. That is, by restricting the flow of the outside air before being ventilated to the first dividing unit or the second dividing unit, it is possible to reduce the amount of outside air flowing to the first dividing unit or the second dividing unit.
As described above, the position changing member may be freely changeable between the first position and the second position by swinging or sliding movement, and the arrangement position in the ventilation direction of the outside air is also upstream of the evaporator. It is possible to appropriately change whether to make it downstream or downstream.

  The present invention provides a refrigerant circuit that circulates the refrigerant in the order of a compressor that compresses the refrigerant, a condenser that dissipates heat from the refrigerant, an expansion valve that expands the refrigerant, and an evaporator that receives heat from the heat-receiving gas. In the various heat pump devices that can eliminate the uneven flow of the heat receiving target gas and prevent the performance deterioration even if the flow of the heat receiving target gas is uneven in the first dividing unit and the second dividing unit. Adaptable.

1 Compressor 2 Condenser 3 Expansion valve (electronic expansion valve)
4 Evaporator 5 Refrigerant Circuit 6 Close Side Control Inhibiting Unit 7 Distributing Unit 8 First Channel 9 Second Channel 10 First Dividing Unit 11 Second Dividing Unit 12 Ventilating means (ventilating fan)
13 Heat Transfer Fin 14 Heat Transfer Tube 15 Refrigerant Evaporating Unit 16 Refrigerant Overheating Unit 17 Ventilation State Adjusting Unit 18 Position Changing Member 19 First Refrigerant Temperature Detection Unit (First Refrigerant Temperature Sensor)
20 Second refrigerant temperature detection means (second refrigerant temperature sensor)
21. Post-merging refrigerant temperature detection means (post-merging refrigerant temperature sensor)
P Target gas (outside air)
R refrigerant

Claims (4)

A compression type compressor provided with a refrigerant circuit that circulates the refrigerant in the order of a compressor that compresses the refrigerant, a condenser that dissipates heat from the refrigerant, an expansion valve that expands the refrigerant, and an evaporator in which the refrigerant receives heat from the heat-receiving gas. A heat pump device,
The refrigerant circuit is divided into a first flow path and a second flow path before the evaporator by a distribution unit, and the first flow path and the second flow path that have passed through the evaporator can be joined together freely. Configured,
In the evaporator, the first flow path is disposed, the first flow path in which the refrigerant in the first flow path receives heat from the heat receiving target gas, and the second flow path is disposed in the second evaporator. The refrigerant in the flow path is divided into a second divided portion that receives heat from the heat receiving target gas,
Ventilation means for allowing the heat-receiving target gas to flow through the first and second division portions; a ventilation state of the heat-receiving target gas to the first division portion; and the heat-receiving target gas to the second division portion. A ventilation state adjusting means capable of adjusting a ventilation state ;
A first refrigerant temperature detecting means for detecting the temperature of the refrigerant that has passed through the first dividing portion; and a second refrigerant temperature detecting means for detecting the temperature of the refrigerant that has passed through the second dividing portion; Based on the detection information of the first refrigerant temperature detecting means and the second refrigerant temperature detecting means, the adjusting means selects the side of the first dividing section and the second dividing section where the temperature of the refrigerant that has passed is higher. Adjusting the ventilation state of the heat-receiving target gas to the first division unit and the ventilation state of the heat-receiving target gas to the second division unit so as to reduce the ventilation amount of the heat-receiving target gas with respect to the lower side heat pump device that. The first divided portion and the second divided portion are arranged in a state of being vertically divided at an intermediate portion in the vertical direction of the evaporator, and the ventilation state adjusting means is arranged at an intermediate portion in the vertical direction of the evaporator. Position change to a first position that regulates the flow of the heat receiving target gas that is arranged and ventilated to the first division part and a second position that regulates the flow of the heat reception target gas to be ventilated to the second division part The heat pump device according to claim 1, comprising a free position changing member . The evaporator is formed by penetrating a heat transfer pipe through which the refrigerant flows through a plurality of heat transfer fins, and the first divided portion and the second divided portion are arranged in an intermediate portion in the vertical direction of the evaporator. In each of the first and second division parts, a refrigerant evaporation part that evaporates the refrigerant and a refrigerant superheating part that overheats the refrigerant that has passed through the refrigerant evaporation part are arranged. And the heat transfer tube has the refrigerant evaporating unit arranged on the middle side in the vertical direction of the evaporator in each of the first divided unit and the second divided unit, and the refrigerant superheated unit is The number of the heat transfer pipes arranged in a state of being arranged in the vertical direction end of the evaporator relative to the refrigerant evaporating unit and arranged in the ventilation direction of the heat receiving target gas is greater than that of the refrigerant evaporating unit than the refrigerant evaporating unit. claims who are disposed so as to be more 1 The heat pump apparatus according to 2. First refrigerant temperature detection means for detecting the temperature of the refrigerant that has passed through the first division part, second refrigerant temperature detection means for detecting the temperature of the refrigerant that has passed through the second division part, and the first flow path And a post-merging refrigerant temperature detecting means for detecting the temperature of the refrigerant after joining with the second flow path, and the refrigerant temperature detected by the first refrigerant temperature detecting means and the second refrigerant temperature detecting means. Closed-side control prohibiting means for prohibiting control of the expansion valve to the closed side when the refrigerant temperature on the lower side of the detected refrigerant temperature is equal to the refrigerant temperature detected by the post-merging refrigerant temperature detecting means the heat pump apparatus according to any one of claims 1 to 3 is provided.

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