KR200275714Y1 - Hot water generating apparatus using heat pump - Google Patents

Abstract

The present invention relates to a heat pump type hot water generator. The present invention comprises a compressor 10, the first heat exchanger 20, expansion valve 30 and the second heat exchanger 40 and the pressure control valve 70. When the pressure of the working fluid entering the compressor 10 is low, the pressure regulating valve 70 transfers a part of the high-temperature gaseous working fluid from the compressor 10 to the outlet of the expansion valve 30. . By doing so, even if the supply of waste hot water to the second heat exchanger 40 is not smooth, the entire apparatus can be operated smoothly. The second heat exchanger 40 is formed with a relatively large capacity, and partitions the heat exchange chamber 42 inside the housing 41 into a partition plate 42g to relatively lengthen the flow passage of the waste hot water. A circulation pump 50 is installed to connect the downstream portion and the upstream portion of the flow passage of the waste hot water to circulate the waste hot water from the downstream portion to the upstream portion. In addition, the receiver 22 installed between the first heat exchanger 20 and the expansion valve 30 has an automatic safety valve that transmits the working fluid to the outlet of the expansion valve 30 when the working fluid pressure therein increases. 25) is installed. According to the present invention as described above, even if the supply of waste hot water is not smooth, the operation of the device is smoothly performed.

Description

Hot water generating apparatus using heat pump

The present invention relates to a hot water generator, and more particularly to a heat pump type hot water generator for generating hot water using the thermal energy of the waste hot water.

1 shows a configuration of a heat pump type hot water generator according to the prior art. Such a hot water generator is used in a bathroom or inn and industrial facilities that use a lot of hot water.

According to this, the compressor (1), the first heat exchanger (3), the expansion valve (5) and the second heat exchanger (6) are connected by a connecting pipe (7) so that the working fluid flows therebetween to make heat exchange. do.

At this time, the first heat exchanger (3) is connected to the hot water tank (8) so that the water of a relatively low temperature from the hot water tank (8) is supplied to the first heat exchanger (3) to exchange heat with the working fluid to become hot water It is delivered to the hot water tank (8) again. In addition, a conduit 10 is connected to the second heat exchanger 6 so that heat for evaporation of the working fluid is supplied from the waste hot water in which the hot water of the hot water tank 8 is used. In this case, the second heat exchanger 6 generally uses a cell and tube method.

Reference numeral 2 is an oil separator for separating oil in the working fluid, and 4 is a receiver for allowing only the working fluid in the liquid state to be delivered to the expansion valve 5.

In the prior art having such a configuration, a high temperature, high pressure gaseous working fluid compressed by the compressor 1 is supplied to the first heat exchanger 3 to transfer heat to the cold water delivered from the hot water tank 8 to supply hot water. Make it up At this time, the working fluid is condensed into a liquid state of low temperature and high pressure.

The working fluid condensed as described above is transferred to the receiver 4, and only the working fluid in the liquid state is transferred to the expansion valve 5 so as to be easily evaporated in the second heat exchanger. It becomes the liquid state of low temperature low pressure. The expanded working fluid receives the heat of the waste hot water from the second heat exchanger 6 and evaporates to a relatively high temperature and low pressure gas state. The working fluid exiting the second heat exchanger 6 is delivered to the compressor 1 and circulated.

However, the prior art as described above has the following problems.

In the second heat exchanger 6, the entire cycle can be operated only when the working fluid receives heat from the waste hot water. However, the waste hot water is not always supplied in a constant amount, and it is not possible to control the supply and discharge of the waste hot water to the second heat exchanger 6, so that it is always possible to supply as much heat as necessary to the second heat exchanger 6. none. Therefore, there is a problem that the operation of the cycle is not smooth when the supply amount of the waste hot water is small.

In addition, the second heat exchanger 6 of the cell-and-tube type used in the prior art has a relatively small capacity and is supplied with low-temperature waste hot water to provide heat for evaporation of the working fluid. Therefore, the inside of the second heat exchanger 6 is easily contaminated by the foreign matter mixed with the waste hot water, and the heat conduction efficiency is drastically degraded by such contamination, and the inside of the second heat exchanger 6 cannot be cleaned. There is a problem.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to provide a hot water generator that is not affected by the supply amount of waste hot water.

Another object of the present invention is to increase the operation reliability of the hot water generator.

1 is a block diagram showing the configuration of a heat pump type hot water generator according to the prior art.

Figure 2 is a block diagram showing the configuration of a preferred embodiment of a heat pump type hot water generator according to the present invention.

Figure 3 is a cross-sectional view showing the configuration of a second evaporator constituting the heat pump type hot water generator according to the present invention.

Explanation of symbols on the main parts of the drawings

10: compressor 11: connecting pipe

12: oil separator 20: first heat exchanger

22: receiver 25: automatic safety valve

30: expansion valve 40: second heat exchanger

40i: waste outlet 40e: waste outlet

45: water level detection unit 46: discharge pump

50: circulation pump 55: temperature sensor

60: liquid separator 70: pressure regulating valve

According to a feature of the present invention for achieving the object as described above, the present invention is a compressor that compresses the working fluid to a relatively high temperature and high pressure, and a first heat exchanger for generating hot water by the heat of the working fluid from the compressor An expansion valve for expanding the working fluid heat-exchanged in the first heat exchanger to be in a relatively low temperature and low pressure state, and the waste hot water supplied from the outside, and receiving the heat of the waste hot water to exit the expansion valve. A second heat exchanger for evaporating the fluid to the compressor and a pressure for selectively opening the valve according to the state of the working fluid flowing into the compressor to transfer the hot gas working fluid passing through the compressor to the expansion valve outlet; It consists of a control valve.

The second heat exchanger has a relatively large capacity, and the heat exchange chamber inside the housing constituting the exterior has a relatively long waste hot water flow path formed by a partition plate, and a heat exchange tube is installed inside the waste hot water flow path. The working fluid travels along the heat exchange tube from the downstream to the upstream.

The second heat exchanger is further provided with a circulation pump for transferring the waste hot water from the downstream portion of the waste hot water flow passage to the upstream portion.

The heat exchange chamber of the second heat exchanger is further provided with a water level sensing unit communicating with a downstream portion of the waste hot water flow passage, extending upwardly and downwardly of the heat exchange chamber, and having a discharge pump.

Between the first heat exchanger and the expansion valve is further provided with a receiver for collecting the working fluid, the receiver is provided with an automatic safety valve for supplying the working fluid to the outlet side of the expansion valve when the working fluid pressure inside the receiver is more than a predetermined It is provided.

According to the present invention having such a configuration, even if the supply of waste hot water is not smooth, there is an advantage that the heat exchange cycle operates smoothly.

Hereinafter, a preferred embodiment of a heat pump type hot water generator according to the present invention as described above will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a preferred embodiment of the warm water generator according to the present invention. According to this, the present invention is largely configured by connecting the compressor 10, the first heat exchanger 20, expansion valve 30 and the second heat exchanger 40 with a connecting pipe 11, pressure adjustment The valve 70 is installed to connect the outlet side of the compressor 10 and the outlet side of the expansion valve 30 so as to selectively send a high temperature gaseous working fluid to the second heat exchanger 40.

The compressor 10 is to compress the working fluid to a relatively high temperature and high pressure gas state. The working fluid compressed by the compressor 10 is transferred to the oil separator 12 along the connecting pipe 11, and in the oil separator 12, oil of the compressor 10 is separated so that only the working fluid is provided. It is delivered to one heat exchanger (20). Reference numeral 11a denotes a return tube for returning oil separated from the oil separator 12 to the compressor 10.

In the first heat exchanger 20, the working fluid and cold water exchange heat to generate hot water. Thus, the working fluid is condensed while transferring heat to the water. The first heat exchanger 20 is preferably a plate heat exchanger.

The receiver 22 is connected to the outlet of the first heat exchanger 20 by a connection pipe 11. The receiver 22 discharges only the liquid in the working fluid condensed by heat exchange in the first heat exchanger 20. In addition, the receiver 22 serves to increase the amount of working fluid present in the entire heat exchange cycle by providing a predetermined amount of working fluid therein.

The receiver 22 is provided with an automatic safety valve 25. The automatic safety valve 25 is connected to the outlet side of the expansion valve 30 so that the amount of working fluid in the receiver 22 increases, so that the pressure automatically increases the expansion valve 30. To be delivered to the exit side.

The expansion valve 30 expands the working fluid condensed by heat exchange in the first heat exchanger 20 to make it relatively low temperature and low pressure. The expansion valve 30 has an inlet connected to an outlet of the receiver 22 and an outlet thereof connected to the second heat exchanger 40.

The second heat exchanger 40 has a relatively large capacity and is well illustrated in FIG. 3. The second heat exchanger 40 is made of a large capacity so that a relatively large amount of wastewater is supplied and stored therein. That is, the second heat exchanger 40 is preferably formed to have a capacity of at least two times or more than the capacity for supplying the amount of heat to operate stably.

Looking at the configuration of the second heat exchanger 40, the housing 41 forms an appearance. The heat exchange chamber 42 for heat exchange is formed in the housing 41. In general, the housing 41 is large enough to allow at least one worker to enter and work therein. The housing 41 is provided with a configuration (not shown) for insulation on the outer surface thereof so as to minimize heat exchange between the inside and the outside of the housing 41.

The heat exchange chamber 42 is partitioned by a partition plate 42g to have a relatively long flow path. That is, the heat exchange chamber (42g) is formed by the partition plate 42g so that the flow path from the waste inlet 40i provided in the upper portion of the housing 41 to the waste outlet 40e formed in the lower portion of the housing 41 becomes relatively long. 42) is partitioned. In this embodiment, the partition plate 42g is provided in a zigzag fashion in the horizontal direction.

The heat exchange tube 43 is provided inside the heat exchange chamber 42. The working fluid of the heat exchange cycle flows into the heat exchange tube 43. The heat exchange tube 43 is in communication with a connection pipe 11 connected to the inlet i and the outlet e of the second heat exchanger 40, respectively. And the inlet (i) is formed in the lower portion of the housing 41 corresponding to the downstream portion in which the waste water is introduced through the waste inlet (40i), the outlet (e) to the waste inlet (40i) And an upper portion of the housing 41 corresponding to an upstream portion of the corresponding waste hot water flow.

On the other hand, one side of the housing 41 is provided with a water level detection unit 45 long vertically. The water level detection unit 45 is formed in communication with the downstream portion of the waste hot water flow path partitioned by the partition plate 42g, and is configured to detect the water level by introducing the waste water which has once transferred heat to the working fluid. The water level sensor 45 is provided with a water level sensor (not shown). And a discharge pump 46 for discharging the waste water to the outside in accordance with the information sensed by the water level sensor is provided. Reference numeral 47 denotes an air vent for discharging air in the heat exchange chamber 42.

Next, a circulation pump 50 for circulating the waste hot water inside the second heat exchanger 40 is provided. The circulation pump 50 serves to deliver the waste hot water from the downstream portion of the flow to the upstream portion. In addition, a discharge valve 52 is installed at the waste discharge port 40e to facilitate cleaning of the inside of the second heat exchanger 40.

In the second heat exchanger 40, the working fluid is evaporated while heat exchange between the waste hot water and the working fluid occurs. Therefore, the waste hot water becomes a relatively low temperature and is discharged through the waste outlet 40e by driving the discharge pump 52 in the second heat exchanger 40. The working fluid discharged from the second heat exchanger 40 is delivered to the liquid separator 60 so that the working fluid in the liquid state is separated and only the working fluid in the gaseous state is transferred back to the compressor 10.

On the other hand, according to the pressure of the working fluid entering the compressor 10, the pressure control valve 70 for selectively transferring the high-temperature, high-pressure gas state working fluid from the compressor 10 to the second heat exchanger (40) ) Is provided. Here, the pressure of the working fluid is lowered when the working fluid does not evaporate properly in the second heat exchanger 40. The pressure adjusting valve 70 operates by detecting this. That is, the waste heat is not smoothly supplied to the second heat exchanger so that the working fluid does not receive heat energy that can be evaporated. The pressure regulating valve 70 has an inlet connected to an outlet side of the oil separator 12 and an outlet connected to an outlet side of the expansion valve 30.

Hereinafter, the operation of the hot water generator according to the present invention having the configuration as described above will be described in detail.

First, in the hot water generating device according to the present invention will be described schematically that the working fluid flows through the device while the phase change and the hot water is generated. The compressor 10 compresses the working fluid into a gaseous state of high temperature and high pressure, and the working fluid passed through the compressor 10 is separated from the oil of the compressor in the oil separator 12. The working fluid passing through the oil separator 12 enters the first heat exchanger 20 and heat exchanges with cold water passing through the first heat exchanger 20, which is a plate heat exchanger, to generate hot water. The working fluid is then condensed to a liquid state and brought to a relatively low temperature. The hot water is transferred to and stored in a separate hot water storage tank and used when necessary.

The working fluid from the first heat exchanger 20 is expanded in the expansion valve 30 to be easily evaporated. The working fluid passing through the expansion valve 30 is transferred to the second heat exchanger 40 to receive heat from the waste hot water and to evaporate into a relatively hot gas state.

On the other hand, when the supply of waste hot water to the second heat exchanger 40 is not smooth, heat exchange of the working fluid does not occur properly. Therefore, the working fluid is not evaporated properly, the pressure of the working fluid of the gas state delivered to the compressor 10 is relatively low. Such a state is sensed by the pressure regulating valve 70, and the pressure adjusting valve 70 opens and a high temperature gas working fluid compressed by the compressor 10 moves toward the outlet of the expansion valve 30. Delivered.

The high-temperature gaseous working fluid delivered to the outlet side of the expansion valve 30 transfers heat to another working fluid that is expanded in the expansion valve 30 to be evaporated and passes through the second heat exchanger 40. do. Therefore, even though the second heat exchanger 40 does not properly receive heat from the waste hot water, the working fluid discharged from the second heat exchanger 40 is transferred to the compressor 10 in a gaseous state. Compression is performed smoothly so that the whole device operates without any problems. Herein, the amount of the working fluid delivered to the expansion valve 30 through the pressure regulating valve 70 is a part of the working fluid to be delivered to the first heat exchanger 20. Therefore, the amount of hot water generated in the first heat exchanger 20 is relatively reduced.

Next, in the second heat exchanger 40, the circulation pump 50 circulates the waste hot water. At this time, the circulation pump 50 relatively moves the waste hot water of the downstream portion to the upstream portion. By doing so, the amount of heat remaining in the waste hot water once heat exchanged with the working fluid can be transferred from the upstream to the working fluid. Therefore, the heat of the waste hot water can be transmitted to the working fluid more reliably. Operation of the circulation pump 50 is made continuously.

The operation of the entire cycle may be controlled based on the temperature detected by the temperature sensor 55. That is, when the temperature inside the second heat exchanger 40 is too low, for example, when the supply of the waste hot water is not smooth, the operation of the device may be stopped by sensing the temperature sensor 55. This may be used selectively or in combination with using the pressure control valve (70).

Next, the automatic safety valve 25 serves to transfer the working fluid pressure inside the receiver 22 to the outlet side of the expansion valve 30 when it is too large. In the prior art, the working fluid was discarded to the outside of the receiver 22 for safety, but in the present invention, the expansion valve 30 was sent to continue to flow in the apparatus.

In order to prevent excessive waste water from being transferred into the second heat exchanger 40, a water level detector 45 is formed, and the discharge pump 46 is installed in the water level detector 45. Therefore, if necessary, by driving the discharge pump 46 to discharge the waste hot water to block the excessive amount of waste water is transferred to the second heat exchanger (40).

The rights of the present invention are not limited to the embodiments described above, but are defined by what is stated in the claims, and those skilled in the art can make various modifications and adaptations within the scope of the rights described in the claims. It is self-evident.

Heat pump type hot water generator according to the present invention as described in detail above has the following effects.

First, even when the supply of waste hot water is not smooth, the entire apparatus can be driven smoothly and continuously generate hot water, thereby increasing the reliability of operation of the hot water generator.

In addition, by installing a circulation pump in the second heat exchanger, the heat of the waste hot water can be more reliably transferred to the working fluid, thereby increasing the thermal efficiency relatively.

In addition, a sufficient amount of working fluid of the entire device is secured by using a receiver, and when the working fluid pressure inside the receiver increases, it is transferred to the expansion valve outlet using an automatic safety valve, so that a sufficient amount of working fluid can be secured at all times. The device can be operated safely.

Finally, the size of the second heat exchanger using waste hot water is made relatively large to minimize the influence of the waste hot water supply amount, and the operator can directly clean the inside to maximize the heat exchange operation characteristics of the second heat exchanger. have.

Claims (5)

A compressor that compresses the working fluid to a relatively high temperature and high pressure, A first heat exchanger for generating hot water by the heat of the working fluid from the compressor; An expansion valve which expands the working fluid heat-exchanged in the first heat exchanger to a relatively low temperature and low pressure; A second heat exchanger passing through the waste hot water supplied from the outside and receiving the heat of the waste hot water and evaporating the working fluid from the expansion valve to the compressor; Heat pump type hot water, characterized in that it comprises a pressure control valve for selectively opening according to the state of the working fluid flowing into the compressor to deliver a high temperature gas working fluid passing through the compressor to the expansion valve outlet. Generator. According to claim 1, wherein the second heat exchanger has a relatively large capacity, the heat exchange chamber inside the housing constituting the appearance is formed a relatively long waste hot water flow path by a partition plate, the inside of the waste hot water flow path A heat pump type hot water generator, characterized in that the heat exchange pipe is installed to exchange heat while the working fluid moves from the downstream to the upstream along the heat exchange pipe. 3. The heat pump type hot water generator according to claim 2, wherein the second heat exchanger further includes a circulation pump for transferring waste hot water from a downstream portion of the waste hot water flow path to an upstream portion. According to claim 2 or 3, wherein the inside of the heat exchange chamber of the second heat exchanger is communicated with the downstream portion of the waste water flow path, is formed in the upper and lower portions of the heat exchange chamber and is further provided with a water level sensing unit having a discharge pump. Heat pump type hot water generator. According to claim 4, Between the first heat exchanger and the expansion valve is further provided with a receiver for collecting the working fluid, the receiver is provided with a working fluid to the outlet side of the expansion valve when the working fluid pressure inside the receiver is above a certain level Heat pump type hot water generator, characterized in that the automatic safety valve for supplying.