JP2015190746A - Ground heat utilization heat pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable ground heat utilization heat pump device that easily switches a plurality of heat exchange parts according to temperature under the ground.SOLUTION: A ground heat utilization heat pump device includes a plurality of heat exchangers 101-104 buried in the ground, a compression unit 2, an expansion unit 3, a plurality of pipelines conducting a heat medium to the inside thereof, a first control unit 4, and a second control unit 5. The first control unit 4 changes over the direction of the heat medium in a corresponding pipeline, and the second control unit 5 changes over the direction of the heat medium and selects between use in heat collection or heat radiation operation with the heat exchangers 101-104 and non-use.

Description

  The present invention relates to a geothermal heat pump device.

A heat pump does not mean a device that generates heat, but means a device that moves heat. Generally, a heat pump is widely used from a low-temperature portion using a heat medium or a semiconductor. There are several techniques for transferring heat to the high-temperature part, but the mainstream is a combination of gas compression / expansion and heat exchange, and it is assumed that a heat pump is used in products found in general households. There are refrigerators, air conditioners, and heat pump water heaters.
Geothermal heat pump equipment is a heat pump system that uses underground heat with a stable temperature and is energy saving compared to boilers and air-cooled heat pumps. Is one of the technologies. The geothermal heat pump device can be used for all facilities that handle heat, such as air conditioning and hot water supply, pool heating, bathtub heating, snow melting, and factory process cooling / heating.
In order to use underground heat with a stable temperature, the heat pump device using geothermal heat, for example, pumps heat using a heat exchanger and a heat pump embedded in the ground (heat collection). Or, by releasing (dissipating) heat into the ground, air conditioning and hot water supply can be performed.
The heat pump that uses geothermal heat is a heat source that indirectly uses heat using a heat exchanger installed in the ground, etc., and an auto that pumps groundwater, etc., and uses it as a heat source. There is a Pun type (groundwater use type), and generally speaking, the use of underground heat often refers to a closed type using a vertical heat exchanger.
The underground heat exchanger used for the indirect type has a horizontal type and a vertical type. The horizontal type digs a groove to an appropriate depth in the ground, and meanders or coils a heat collecting pipe such as a metal pipe or a resin pipe there. Embed in the shape. On the other hand, the vertical type has a bore hole of appropriate diameter and depth, for example, a resin tube (generally a high-density polyethylene tube, which is called a metal tube or a U tube with a U-shaped tip). A typical heat exchanger is one or two inserted into a heat exchanger.
The heat pump is, for example, a compressor, a condenser (heat exchanger), an expansion valve, an evaporator (heat exchanger), a pipe connecting them, and a heat medium (refrigerant) enclosed in them. It consists of.
The refrigerant in the heat pump repeats the following process.
Compression process: When the compressor is operated, it is compressed into a high-temperature and high-pressure gas.
Condensation process: heat is dissipated and liquefied by exchanging heat with a medium (heat medium) that exchanges heat with a condenser.
Evaporation process: Evaporates by absorbing heat by exchanging heat with a medium (heat medium) that exchanges heat with an evaporator.
Expansion process: The expansion valve expands to a low temperature.
A heat pump type air conditioner is required for switching from cooling to heating, and a four-way valve that serves to switch between the high-pressure side and low-pressure side of the refrigerant to remove frost attached to the outdoor unit or indoor unit The switching valve is used.

The geothermal heat pump device can use underground heat having a stable temperature, and is effective in saving energy and contributing to reduction of carbon dioxide emission due to global warming.
However, since the underground heat collection pipe (radiation pipe) collects heat or dissipates heat between the heat medium and the geothermal heat on its surface, the size of the surface area becomes a problem. It is necessary to cover the low.
If that happens, the length of the underground heat collection pipe (radiation pipe) will have to be increased, and the amount of heat medium inside the underground heat collection pipe (radiation pipe) will increase accordingly. Inevitably, it may be more than three times that of a general air-cooled model, and there is an urgent need to reduce the heat medium in the underground heat collection pipe (radiation pipe).
When a large number of underground heat collection tubes (radiation tubes) are buried in the ground, the filling amount of the heat medium inside the underground heat collection tubes (radiation tubes) must be further increased. .
In addition, in a geothermal heat pump device, in order to accurately operate the expansion valve constituting the device at the time of cooling, a condensation pressure (for example, 1.7 Mpa) above a certain level in the condensation process as described above. Although it is necessary, the condensing temperature (pressure) does not rise during the inverter low-speed operation in the compressor, so that the pressure difference between the entrance and exit of the expansion valve is negligible, and the expansion valve operates. When the underground temperature is low (especially 10 ° C in Hokkaido in a cold region), the amount of heat exchange increases. However, even if the underground temperature is low, the cooling capacity is insufficient.
Therefore, it is required that the geothermal heat pump device can be stably operated according to the change in the condensation pressure and the condensation temperature, such as causing no malfunction of the expansion valve.
On the other hand, the weight applied to the bottom of the heat exchanger (ground heat collection / radiation pipe) buried in the ground in the geothermal heat pump device is related to the liquid ratio of the heat medium in the heat exchanger, There is a need to reduce the weight on the bottom. In addition, the liquid ratio of the heat medium in the heat exchanger is a problem, and in order to push up the heat medium having a large liquid ratio upward in the pipe, the power of the compressor is consumed greatly, and the expansion section accurately operates. Or disturb.

JP 2009-92350 A, JP 2009-923350 A, JP 2014-37954 A

The object of the present invention is to provide a novel technique while eliminating the drawbacks of the prior art.
Other objects and novel features of the present invention will become apparent from the description of the present specification and the drawings.

The present invention comprises a plurality of heat exchange units, compression units, expansion units, and a plurality of pipes, a first control unit, and a second control unit embedded in the ground. A part of the plurality of pipes is a connection pipe that connects the second control unit and the compression unit, and the heat medium is sent from the second control unit to the compression unit. The first control unit switches the direction of the heat medium in the pipe, and the second control unit switches the direction of the heat medium and controls the plurality of heat exchange units. The present invention relates to a geothermal heat pump device characterized in that selection of use or non-use in heat collection or heat radiation operation is performed.
As a preferred embodiment of the present invention, as described in claim 2, the first control unit includes a four-way, three-way, or two-way heat medium direction switching valve.
As a preferred embodiment of the present invention, as described in claim 3, the second control unit includes an electromagnetic valve and a four-, three-, or two-way heat medium direction switching valve. .
According to a preferred embodiment of the present invention, as described in claim 4, the geothermal heat pump device includes a first heat exchange unit, a second heat exchange unit, Used in the heat collection or heat radiation operation of the first heat exchange unit, the second heat exchange unit, and the third heat exchange unit by the second control unit. In this case, the heat medium is sent from the second control unit to the compression unit via a connection pipe connecting the second control unit and the compression unit. It is designed to do this.
According to a preferred embodiment of the present invention, as described in claim 5, the geothermal heat pump device includes a first heat exchange unit and a second heat exchange unit, The control unit is configured to switch between use and non-use in heat collection or heat dissipation between the first heat exchange unit and the second heat exchange unit, and at that time, from the unused heat exchange unit A heat medium is sent to the compression unit through a connection pipe connecting the heat exchange unit and the compression unit.
According to a preferred embodiment of the present invention, as described in claim 6, in the heat pump device using geothermal heat, a plurality of heat exchanging units embedded in the ground are provided with a capillary tube at the bottom of the heat exchanging unit. The heat exchange part formed by attaching the capillary tube to the heat medium in the pipe into a two-phase flow of a liquid phase and a gas phase, and the capillary tube attached thereto is filled with liquid. It is characterized by being disposed inside a cylindrical body.

According to the geothermal heat pump device of the present invention, the plurality of heat exchanging units, the compression units, the expansion units, the plurality of pipes for conducting the heat medium therein, the first control unit, and the second And a part of the plurality of pipes is a connection pipe connecting the second control unit and the compression unit, and the second control unit is connected to the compression unit. The heat medium is sent out, the first control unit switches the direction of the heat medium in the pipe, and the second control unit switches the direction of the heat medium. It is characterized by the fact that the use or non-use selection switching in the heat collection or heat radiation operation of the plurality of heat exchanging sections is performed and the heat medium in the underground heat collection pipe (radiation pipe) is reduced. Also, during cooling, even if the condensation temperature (pressure) is increased and the underground temperature is low, It can be operated accurately valve can be prevented to cause a problem that cooling capacity is insufficient.
Furthermore, according to the present invention, the plurality of heat exchange units can be easily switched, and the plurality of heat exchange units can be appropriately switched according to the temperature in the ground.
According to the present invention, as a preferred embodiment, as described in claim 2, the first control unit includes a four-way, three-way, or two-way heat medium direction switching valve. In addition, the heat medium direction switching valve switches the direction of the flow path of the heat medium, and the heat medium of the connection pipe that connects the heat exchange part of the partial pipe in the plurality of pipes and the compression part The flow of the heat medium from the partial heat exchange part in the plurality of heat exchange parts to the compression part can be made smooth.
According to the present invention, as a preferred embodiment, as described in claim 3, the second control unit includes an electromagnetic valve and a four-, three-, or two-way heat medium direction switching valve. While having the above-mentioned effects, it is possible to further restrict the flow of the heat medium to control the pressure and temperature of the heat medium, and to easily switch between the plurality of heat exchange units, The plurality of heat exchange units can be appropriately switched according to the temperature.
According to the present invention, as a preferred embodiment, as described in claim 4, the geothermal heat pump device includes a first heat exchange section and a second heat exchange section having a configuration ratio of 3 to 3 to 4. And the third heat exchanging unit, and the second control unit uses the first heat exchanging unit, the second heat exchanging unit, and the third heat exchanging unit in heat collection or heat radiation operation or Switching of non-use is performed, and at that time, the heat medium is sent from the non-use heat exchange unit to the compression unit through a connection pipe connecting the heat exchange unit and the compression unit. If it is, the said effect can be produced | generated, and the air conditioning operation according to the percentage of the heat exchange amount in a heat exchange part is attained.
According to the present invention, as a preferred embodiment, as described in claim 5, the geothermal heat pump device includes a first heat exchanging part and a second heat exchanging part. The second control unit switches between use and non-use in heat collection or heat dissipation between the first heat exchange unit and the second heat exchange unit, and in that case, the second control When the heat medium is sent from the second control unit to the compression unit via a connection pipe that connects the compression unit and the compression unit, the effect can be achieved and the heat in the heat exchange unit can be obtained. Air-conditioning operation according to the percentage of exchange amount becomes possible.
According to the present invention, as a preferred embodiment, as described in claim 6, in the heat pump device using geothermal heat, a plurality of heat exchanging units embedded in the ground are connected to the capillary tube at the bottom of the heat exchanging unit. And the heat exchange part in which the capillary tube is attached is filled with liquid. Since the liquid ratio of the heat medium in the heat exchanger decreases, the heat exchanger embedded in the ground in the geothermal heat pump device (underground) The weight applied to the bottom of the heat collecting / radiating pipe) can be reduced, and the stable geothermal heat pump device can be operated.

  Next, embodiments of the present invention will be described with reference to the drawings.

Example 1
In the embodiment shown in FIG. 1, the geothermal heat pump device H includes a first heat exchange unit 101, a second heat exchange unit 102, and a third heat exchange unit 103 embedded in the ground. The heat exchange unit 1, the compression unit 2, the expansion unit 3, the plurality of pipes X (X 1, X 2, and X 3) that conduct the heat medium to the inside, and the first control unit 4. And a second control unit 5.
The heat exchange unit 1 is configured with an appropriate ratio of the first heat exchange unit 101, the second heat exchange unit 102, and the third heat exchange unit 103, and the first heat exchange unit 101 and the second heat exchange unit 103 In this embodiment, the composition ratio (heat exchange amount) between the heat exchange unit 102 and the third heat exchange unit 103 is 30% for the first heat exchange unit 101, 30% for the second heat exchange unit 102, The 3rd heat exchange part 103 is comprised by 40%.
As shown in the figure, the heat exchanging section 1 has a plurality of underground heat collecting pipes (radiation pipes) embedded in parallel, and functions as condensation (radiation) and evaporation (heat absorption). It is like that. As described above, the heat exchanging unit 1 is configured by a group having the underground heat collecting pipe (radiation pipe), and in the above example, the heat exchanging unit 101 and the group of the first heat exchanging units 101 and the second heat exchanging unit are provided. The unit 102 is composed of a group and the third heat exchange unit 103.
As illustrated, the heat medium compressed by the compressor 200 of the compression unit 2 and flowing out from the compression unit 2 to the pipe X is a high-temperature and high-pressure gas, for example, a gas of 50 to 60 ° C., It flows into the pipe X1 of the pipe X, flows into the four-way switching valve 500 in the second control section 5, and then flows into the second heat exchange section 102 in the center of the heat exchange section 1 to exchange heat with soil in the soil. The heat medium gas that has been sent to the electromagnetic valve 5000 of the second control unit 5 and has dropped to, for example, about 30 ° C. via the electromagnetic valve 5000 is sent to the expansion unit 3, and the expansion unit 3 The heat medium which has been expanded by the expansion valve 300 in FIG. 6 and has become a low temperature of 16 ° C., for example, is sent to the indoor unit 6 and used for cooling.
The heat medium compressed into the high-temperature and high-pressure gas by the compression unit 2 and discharged from the compression unit 2 to the pipe X flows into the pipe X2 of the pipe X, and the four-way switching valve in the first control unit 4 400, is sent to the first heat exchanging unit 101 on the left side of the heat exchanging unit 1 through the flow path of the four-way switching valve 400, and heat exchange is performed in the first heat exchanging unit 101. Then, for example, the heat medium gas whose temperature has dropped to about 30 ° C. is sent to the expansion unit 3 and expanded by the expansion valve 300 in the expansion unit 3. For example, the heat medium having a low temperature of 16 ° C. is the indoor unit. 6 is used for cooling.
As shown in the figure, the other heat medium that is compressed by the compression unit 2 to become a high-temperature and high-pressure gas and flows out from the compression unit 2 to the pipe X, and flows into the pipe X1 of the pipe X. Is sent to the third heat exchanging unit 103 and sent to the third heat exchanging unit 103, but the operation of the electromagnetic valve 5010 of the second control unit 5. Therefore, the flow is stopped and it is not sent to the expansion part 3. That is, the heat medium is not sent to the indoor unit 6, and in this state, the heat medium is not used for cooling. In the heat collection or heat radiation operation in the third heat exchange unit 103, the first heat exchange unit 101 is used. Unlike the second heat exchange unit 102 and the second heat exchanging unit 102, they are not in use and are not in use.
As shown in the figure, the heat medium in the third heat exchange unit 103 is sent to the compression unit 2 through a pipe X3 that connects the second control unit 5 and the compression unit 2. It has become.
As described above, the plurality of heat exchanging units 101, 102, and 103 are configured to switch between use and non-use in heat collection or heat dissipation operation by operation of the second control unit 5, The partial pipes in the plurality of pipes X are connection pipes X3 that connect the second control unit 5 and the compression unit 2, and the partial heat exchange units in the plurality of heat exchange units When the heat exchanging unit 103 is not used, a heat medium is sent from the second control unit 5 to the compression unit 2, so that an underground heat collecting pipe (radiation pipe) 101 buried in the ground is used. , 102 and 103 can be reduced.
In addition, the plurality of heat exchanging units 101, 102, and 103 are switched between use and non-use in the heat collecting or heat radiation operation by the operation of the second control unit 5, so Accordingly, the amount of heat medium can be adjusted.
Further, during the cooling shown in FIG. 1, the condensation temperature (pressure) in the underground heat collecting pipes (radiating pipes) 101, 102 and 103 can be increased, and the expansion valve 300 can be accurately set even if the underground temperature is low. It can be made to operate, and it is possible to prevent a problem that the cooling capacity is insufficient.
Furthermore, according to the present invention, the plurality of heat exchange units 101, 102, and 103 can be easily switched by operating the second control unit 5, and the plurality of the heat exchange units 101, 102, and 103 can be appropriately selected according to the underground temperature. The heat exchange section can be switched.
In this case, if the condensing pressure rises too much, a decrease in COP (Coefficient of Performance) or operating coefficient in the geothermal heat pump device H, which is a coefficient used as a measure of energy consumption efficiency of a cooling device, etc. For example, when the condensation pressure reaches a set value, for example, 2.1 Mpa, the plurality of heat exchange units 101, 102, and 103 are switched by operating the second control unit 5 to lower the condensation pressure. , High COP operation can be ensured.
In this case, the setting of the above operation can be performed not only at the condensation pressure but also at the condensation temperature, and the temperatures of the used heat exchange units 101, 102, and 103 in the plurality of heat exchange units 101, 102, and 103 that are used. When the condensing pressure rises, the operation can be repeated by switching to the heat exchange units 101, 102 and 103 where the unused temperature is lowered.
Furthermore, switching according to the temperature in the ground is also possible, and when the temperature reaches a certain value, the switching can be appropriately performed.
Although not shown, for example, the second control unit 5 and / or the first control unit 4 may be provided with a detection unit that can detect the condensation pressure (temperature) or measure the temperature in the ground. .
According to the change in the condensation pressure and the condensation temperature in the heat exchanging section 1, it is possible to operate the stable geothermal heat pump device such as causing no malfunction of the expansion valve 300.
The temperature of the ground is measured by the detection unit, and the second control unit 5 collects or radiates heat from the first heat exchange unit 101, the second heat exchange unit 102, and the third heat exchange unit 103. Switching between use and non-use in the operation is possible, and an air-conditioning operation according to a change in the temperature in the ground becomes possible.
The geothermal heat pump device H shown in FIG. 1 includes a first heat exchange unit 101 (heat exchange amount 30%) and a second heat exchange unit 102 (heat exchange amount 30) having a composition ratio of 3 to 3 to 4. %) And the third heat exchange unit 103 (heat exchange amount 40%), and the second control unit 5 controls the first heat exchange unit 101 and the second heat exchange unit 102. And switching between use and non-use in the heat collecting or heat radiation operation of the third heat exchanging unit 103, and at that time, from the non-use heat exchanging unit 103 to the second control unit 5 A heat medium is sent to the compression unit 2 through a connection pipe X3 that connects the compression unit 2, and the heat exchange amount in the heat exchange units 101, 102, and 103 is in accordance with the percentage. Air conditioning operation is possible.

Example 2
In the embodiment shown in FIG. 2, as in the first embodiment, the geothermal heat pump device H includes a first heat exchanging portion 101, a second heat exchanging portion 102, a third heat exchanging portion buried in the ground. A heat exchanging unit 1 composed of a heat exchanging unit 103, a compressing unit 2, an expanding unit 3, a plurality of pipes X for conducting a heat medium therein, a first control unit 4, and a second control. Part 5.
The heat exchange unit 1 has 30% of the first heat exchange unit 101, 30% of the second heat exchange unit 102, and 40% of the third heat exchange unit 103 in their constituent ratio (heat exchange amount). It consists of
The heat medium compressed into the high-temperature and high-pressure gas by the compression unit 2 and discharged from the compression unit 2 to the pipe X flows into the pipe X2 of the pipe X and is sent to the first control unit 4, and then The heat medium is sent to the first heat exchanging unit 101 and heat exchange is performed in the first heat exchanging unit 101. Next, for example, the heat medium gas whose temperature has dropped to about 30 ° C. is sent to the expansion unit 3 and expanded. For example, the heat medium having a low temperature of 16 ° C. is sent to the indoor unit 6 and used for cooling.
The heat medium compressed into the high-temperature and high-pressure gas by the compression unit 2 and discharged from the compression unit 2 to the pipe X flows into the pipe X1 of the pipe X, and then the four-way switching valve 501 in the second control unit 5, , Flows into the third heat exchanging unit 103, exchanges heat with the soil in the soil, is sent to the electromagnetic valve 5010 of the second control unit 5, and passes through the electromagnetic valve 5010, for example, about 30 ° C. The heat medium gas whose temperature has dropped is sent to the expansion unit 3 and expanded by the expansion unit 3. For example, the heat medium having a low temperature of 16 ° C. is sent to the indoor unit 6 and used for cooling.
On the other hand, as shown in the figure, a heat medium compressed into the high-temperature and high-pressure gas by the compression unit 2 and flowing out from the compression unit 2 to the pipe X, and flowing into the pipe X1 of the pipe X Is flowed to the four-way switching valve 500 in the second control unit 5 and sent to the second heat exchange unit 102, but the flow is stopped by the action of the electromagnetic valve 5000, so that it is not sent to the expansion unit 3. In addition, the heat medium in the second heat exchange unit 102 is connected to the compression unit through a pipe X3 that connects the second control unit 5 and the compression unit 2 as illustrated. 2 is sent out (sucked by the compression unit).
The geothermal heat pump device H shown in FIG. 2 includes a first heat exchange unit 101 (heat exchange amount 30%) and a second heat exchange unit 102 (heat exchange amount 30) having a configuration ratio of 3 to 3 to 4. %) And a third heat exchanging part 103 (heat exchanging amount 40%), and the second control part 5 makes the first heat exchanging part 101, the second heat exchanging part 102, and the third The heat exchanging unit 103 is switched between use and non-use in the heat collecting or heat radiation operation. At that time, from the second control unit 5 to the second control unit 5 and the compression unit 2 The heat medium is sent to the compression unit 2 through the connection pipe X3 that connects to the cooling unit 2, and a cooling operation (cooling operation) according to the percentage of the heat exchange amount in the heat exchange units 101, 102, and 103 is performed. 70%).
As in the first embodiment, it is possible to reduce the heat and heat medium in the heat exchanging unit 1 including the first heat exchanging unit 101, the second heat exchanging unit 102, and the third heat exchanging unit 103 embedded in the ground. And the like.

Example 3
In the third embodiment, the high-temperature and high-pressure gas is compressed by the compression unit 2, and the heat medium flowing out from the compression unit 2 to the pipe X flows into the pipe X <b> 2 of the pipe X to the first control unit 4. Then, the heat medium gas is sent to the first heat exchange unit 101, where heat exchange is performed in the first heat exchange unit 101, and then, for example, the heat medium gas whose temperature has dropped to about 30 ° C. The heat medium which has been sent to and expanded to a low temperature of 16 ° C., for example, is sent to the indoor unit 6 and used for cooling.
In the third embodiment, the heat medium compressed into the high-temperature and high-pressure gas by the compression unit 2 and flowed from the compression unit 2 to the pipe X1 is the four-way switching valve 500 and the four-way switching valve in the second control unit 5, respectively. The heat medium in each of the second heat exchange unit 102 and the third heat exchange unit 103 flows through the second control as illustrated in FIG. It is sent out to the said compression part 2 through the piping X3 which connects the part 5 and the said compression part 2. FIG.
In the second heat exchanging unit 102 and the third heat exchanging unit 103, the heat medium in the second heat exchanging unit 102 and the third heat exchanging unit 103 is stopped by the action of the electromagnetic valve 5000 and the electromagnetic valve 5010 of the second control unit 5, respectively. Then, it is not sent to the expansion unit 3 and the indoor unit 6, and in this state, it is not used for cooling.
In the third embodiment, in other respects, the same configuration as that of the first embodiment and the second embodiment is adopted, and the excellent operational effects are also the same.

Example 4
In the geothermal heat pump device H of the embodiment shown in FIG. 4, the heat medium flowing out from the compression unit 2 to the pipe X flows into the pipe X1 of the pipe X, and the four-way switching valve of the first control unit 4. 400, and then flows to the four-way switching valve 502 in the second control unit 5 and then to the second heat exchange unit (A circuit) 102 to perform heat exchange with the soil in the soil, and to perform the second control. The heat medium gas that has been sent to the electromagnetic valve 5020 in the unit 5 and has dropped to, for example, about 30 ° C. via the electromagnetic valve 5020 is sent to the expansion valve 300 of the expansion unit 3 and expanded by the expansion valve 300. For example, the heat medium having a low temperature of 16 ° C. is sent to the indoor unit 6 and used for cooling.
On the other hand, the heat medium that flows out from the compression unit 2 to the pipe X1 and is sent to the second control unit 5 through the first control unit 4 passes through the control switch 503 of the second control unit 5 to the first. As shown in the figure, the heat medium is sent to the four-way switching valve 5021 of the second control unit 5, the flow is stopped, and the heat medium is sent to the expansion unit 3. There is no such thing. The heat medium is sent from the second control unit 5 to the compression unit 2 through a connection pipe X3 that connects the second control unit 5 and the compression unit 2.
The geothermal heat pump device H shown in FIG. 4 includes a first heat exchange unit 101 (A circuit) and a second heat exchange unit 102 (B circuit) having a one-to-one configuration ratio. The first heat exchange unit 101 and the second heat exchange unit 102 are operated by the four-way switching valve 502 (SV1), the electromagnetic valve 5020 (SV2), and the electromagnetic valve 5021 (SV3) of the second control unit 5. Switching between use and non-use in the heat collection or heat radiation operation is performed.

Example 5
The geothermal heat pump device H of the embodiment shown in FIG. 5 does not use the second heat exchanging portion (A circuit) 102 and the first heat exchanging portion (B circuit) 101 in the fourth embodiment. In the geothermal heat pump device H shown in FIG. 5, the first heat having a one-to-one configuration ratio is configured in the same manner. It is comprised from the exchange part 101 (A circuit) and the 2nd heat exchange part 102 (B circuit), The said 1st heat exchange part 101 and the 2nd heat exchange part 102 are carried out by the 2nd control part 5. Switching of use or non-use in the heat collecting or heat radiation operation of the four-way switching valve 502 (SV1), solenoid valve 5020 (SV2) and solenoid valve 5021 (SV3) of the second control unit 5. Due to the action, the cooling operation as shown in the figure can be performed. . In addition, in the solenoid valve 5020, the name of the heat medium from the second heat exchange unit (A circuit) 102 is stopped.
Further, as shown in the figure, in the geothermal heat pump device H of the embodiment shown in FIG. 5, a connection for connecting the second control unit 5 and the compression unit 2 from the second control unit 5. A heat medium is sent to the compression unit 2 through the pipe X3.

Example 6
The geothermal heat pump device H of the embodiment shown in FIG. 6 is an embodiment applied to heating, and the heat medium flowing out from the compression section 2 to the pipe X flows into the pipe X1 of the pipe X, and the first For example, a heat medium having a temperature of about 56 ° C. is sent to the indoor unit 6 and used for heating.
For example, the heat medium of 40 ° C. used for heating in the indoor unit 6 is sent to the expansion valve 300 of the expansion unit 3, expanded by the expansion valve 300, and then flows to the second control unit 5. Is sent to the electromagnetic valve 5020 in the control unit 5 and sent to the second heat exchange unit (A circuit) 102 via the electromagnetic valve 5020. In the second heat exchange unit (A circuit) 102, Heat exchange is not performed with the soil in the soil, and the heat medium is sent from the second control unit 5 to the compression unit 2 through the connection pipe X3 connecting the second control unit 5 and the compression unit 2. It has become.
On the other hand, it is sent to the expansion valve 300 of the expansion unit 3, expanded by the expansion valve 300, and then sent to the electromagnetic valve 5021 in the second control unit 5, and the first heat is transmitted via the electromagnetic valve 5021. The heat medium sent to the exchange unit (B circuit) 101 exchanges heat with the soil in the soil in the first heat exchange unit (B circuit) 101, and then the four-way switching in the second control unit 5 It is sent to the four-way switching valve 400 in the first control unit 4 through the valve 502, then sent to the compression unit 2, and again compressed by the compression unit 2, and again as described above, the indoor unit 6 is used for heating.
Also in the present embodiment, the geothermal heat pump device H is composed of the first heat exchange unit 101 (A circuit) and the second heat exchange unit 102 (B circuit) having a one-to-one configuration ratio. The second control unit 5 switches between use and non-use in the heat collection or heat radiation operation between the first heat exchange unit 101 and the second heat exchange unit 102. The heating operation as shown in the figure can be performed by the action of the four-way switching valve 502 (SV1), the electromagnetic valve 5020 (SV2), and the electromagnetic valve 5021 (SV3) of the control unit 5.

Example 7
FIG. 7 shows a geothermal heat pump device H according to another embodiment of the present invention. As shown in FIG. 8 (A), the geothermal heat pump device H has a capillary tube 7 attached to the bottom of a heat exchanging portion 101 buried in the ground.
As shown in the figure, the upper portion of the capillary tube 7 is connected to the underground heat collecting / radiating tube 1010.
When the heat medium passes through the inside of the capillary tube 7 from the underground heat collection / radiation tube 1011 of the heat exchanger 101 through the underground heat collection / radiation tube 1012, the underground heat collection / radiation tube 1010 Inside, as shown in FIG. 8B, the heat medium is a two-phase flow of a liquid phase L and a gas phase V.
In the heat exchanger 101 provided with the capillary tube 7, the liquid 9 is sealed inside the cylindrical body 8, and the cylindrical body 8 is embedded in the soil 10.
Since the heat exchanging portion 101 provided with the capillary tube 7 is disposed inside the cylindrical body 8 in which the liquid 9 is sealed, the heat exchanging portion 101 is configured to perform the underground heat collection / The heat medium inside the heat radiating pipes 1010, 1011 and 1012 does not exchange heat with the soil 10, but exchanges heat with the liquid 9 inside the cylindrical body 8. It is a type geothermal heat pump device.
The heat medium in the heat exchanger 101 is increased in gas phase by the capillary tube 7 and becomes a two-phase flow of liquid phase L and gas phase V as shown in FIG. As a result, the liquid ratio in the heat medium decreases, and the weight applied to the bottoms of the heat exchangers (underground heat collection / radiation tubes) 101 and 102 embedded in the ground in the geothermal heat pump device H is reduced. It is possible to reduce and stabilize the operation of the geothermal heat pump device.
FIG. 9 shows an application of the direct condensation / evaporation type geothermal heat pump device to the cooling circuit shown in FIG.
In the geothermal heat pump device H of the embodiment shown in FIG. 9, the heat medium that has flowed out from the compression unit 2 to the pipe X flows into the pipe X1 of the pipe X, and the four-way switching valve of the first control unit 4. 400, then flows to the first heat exchanging part (B circuit) 101, and the heat medium passes through the underground heat collecting / radiating pipe 1012 from the underground heat collecting / radiating pipe 1011 of the heat exchanger 101. When passing through the inside of the capillary tube 7, the heat medium becomes a two-phase flow of the liquid phase L and the gas phase V inside the underground heat collecting / radiating tube 1010 as shown in FIG. It becomes easy to float upward, and heat exchange is performed with the liquid 9 inside the cylindrical body 8.
The heat medium having undergone heat exchange in the first heat exchanging section (B circuit) 101 is sent to the indoor unit 6 and used for cooling, but in the direct condensation / evaporation type geothermal heat pump device H, As shown in FIG. 9, before flowing into the expansion unit 3, the fourth heat exchange unit 104 is passed through. In the fourth heat exchanging unit 104, the second heat exchanging unit (A circuit) 102 that is not used is connected to the compressing unit 2 through the connection pipe X 3 that connects the second control unit 5 and the compressing unit 2. Heat exchange is performed with the heat medium that has been sent out to cool the heat medium and return it to the liquid heat medium.
As described above, the flow of the heat medium flowing out from the compression unit 2 to the pipe X1 is stopped by the four-way switching valve 502 in the second control unit 5, and the second heat exchange unit (A circuit) 102 The second control unit 5 and the compression unit 2 are connected to the compression unit 2 through a connection pipe X3.
In the geothermal heat pump device, the liquid ratio of the heat medium in the heat exchanger 101 is improved by being a two-phase flow by attaching the capillary tube 7 as described above, and is buried in the ground. Reducing the weight applied to the bottom of the heat exchanger (ground heat collection / radiation pipe) 101, reducing the power of the compressor 2 when the heat medium in the heat exchanger is pushed upward in the pipe, The correct operation of the inflating part 3 can be performed.
The heat exchange unit 102 has the same configuration as the heat exchange unit 101.

The underground heat exchanger 1 in the present invention can be applied to a mode in which the heat exchanger extends perpendicular to the ground. It can be applied to both vertical and underground heat exchangers. There are two types of borehole method and pile method.
The former is a new method of making a borehole (a hole made by a boring work using a boring machine) to embed the underground heat exchanger, and the latter is in the foundation pile of a building. In this method, a ground heat exchanger is buried in the ground, or the foundation pile itself is a ground heat exchanger.
The underground heat exchanger 1 may be constituted by, for example, a resin pipe (generally, a high density polyethylene pipe is used), but in consideration of heat conduction, the underground heat exchanger 1 is constituted by a metal pipe. Is preferred.
When constructing a plurality of underground heat exchangers 1 as in the present invention, as described above, they are configured in groups, for example, when using 10 underground heat radiating pipes, 5 each in 2 systems, or It is good to divide into 4 and 6 and use.

  The expansion unit 3 is typically composed of an expansion valve 300, such as a manual expansion valve, a low-pressure expansion valve, a temperature automatic expansion valve, a low-pressure side float valve, a high-pressure side float valve, and an electronic expansion valve. Can be used. The expansion valve 300 may be basically any one as long as it has a configuration in which the liquid refrigerant is decompressed and expanded and the flow rate is adjusted according to the load. As the expansion part 3, a capillary tube may be used.

The first control unit 4 of the present invention can use a three-way or two-way heat medium direction switching valve in addition to the four-way switching valve 400. Further, a five-way heat medium direction switching valve may be used, and any other heat medium direction switching valve may be used.
The four-way switching valve (four-way valve) is, for example, a valve that flows one start point W in one direction Y1 and another start point Z in another direction Y2 together. In Y2, Z is switched so that Z flows in Y1. In terms of watches, the flow from the 12 o'clock direction is flowing in the 3 o'clock direction, the flow from the 6 o'clock direction is flowing in the 9 o'clock direction, and the flow from the 12 o'clock direction by switching is 9 o'clock. The flow from the 6 o'clock direction is changed to the 3 o'clock direction.
The three-way valve is a valve that changes the flow rate of the fluid flowing in both B and C, with a branch having a starting point A and end points B and C. A three-way valve is a valve that divides the flow path of the pipe into two directions. The two-way valve is a valve that opens and closes the flow path of the pipe. The switching valve may be manual, pneumatic, or electric.

It is possible to use alternative chlorofluorocarbons such as HCFC (hydrochlorofluorocarbon), HFC (hydrofluorocarbon), and PFC (perfluorocarbon) as the heat medium. Although it is preferable for reasons such as reduction, tap water, antifreeze, carbon dioxide, ammonia, propane, isobutane, ethylene, halogenated methane, fluorocarbon, etc. may be used, which are materially stable and easy to evaporate. Any substance may be used as long as it has a large property. In particular, it is desirable that the pressure during evaporation is not lower than atmospheric pressure and is not in a vacuum region. A mixed refrigerant obtained by mixing two or more refrigerants can also be used.
As the liquid 9 inside the cylindrical body 8 in the direct condensation / evaporation type geothermal heat pump device, for example, water or antifreeze is used.

The electromagnetic valves 5000, 5010, 5020, and 5021 in the second control unit 5 of the present invention can adjust the pressure and temperature of the heat medium by restricting the flow of the heat medium.
An electromagnetic valve is a combination of an electromagnet and a valve. By turning electricity on and off, the flow of the heat medium is stopped or flown, and the flow direction is switched. Solenoid valves are usually composed of solenoid parts (coils, yokes, sleeves, cores, plug nuts, etc. that convert electrical energy into mechanical motion) and valve parts (valves that open and close flow paths). A part composed of a body and an orifice).
As the four-way switching valves 500, 501, and 502 in the second control unit 5 of the present invention, the same ones as the four-way switching valve 400 used in the first control unit 4 can be used, or three-way or two-way. The heat medium direction switching valve can also be used, and a five-way heat medium direction switching valve may be used as long as it is a multiple heat medium direction switching valve.

  The present invention is not limited to the above-described embodiments, and can be modified as appropriate.

  The present invention is not limited to air conditioning, and can be used for all facilities that handle heat, such as hot water supply, pool heating, bathtub heating, snow melting, and factory process cooling / heating.

It is a circuit diagram of a geothermal heat pump device showing an embodiment of the present invention. It is a circuit diagram of a geothermal heat pump device showing another embodiment of the present invention. It is a circuit diagram of a geothermal heat pump device showing another embodiment of the present invention. It is a circuit diagram of a geothermal heat pump device showing another embodiment of the present invention. It is a circuit diagram of a geothermal heat pump device showing another embodiment of the present invention. It is a circuit diagram of a geothermal heat pump device showing an embodiment of the present invention. It is a circuit diagram of a direct condensation / evaporation type geothermal heat pump device showing another embodiment of the present invention. (A) It is a circuit diagram of a direct condensation / evaporation type geothermal heat pump device showing another embodiment of the present invention, and (B) is an explanatory diagram of a two-phase flow. It is a circuit diagram of a direct condensation / evaporation type geothermal heat pump device showing another embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1 Heat exchange part 2 Compression part 3 Expansion part 4 1st control part 5 2nd control part 6 Indoor unit 7 Capillary tube 101 1st heat exchange part 102 2nd heat exchange part 103 3rd heat exchange Part 104 Fourth heat exchanging part 300 Expansion valve 400 Four-way switching valve 500 Four-way switching valve 501 Four-way switching valve 502 Four-way switching valve 5000 Electromagnetic valve 5010 Electromagnetic valve 5020 Electromagnetic valve X piping X3 The second control unit and the compression unit are connected. Connecting piping H Geothermal heat pump device

Claims (6)

A plurality of heat exchanging units, compression units, expansion units, and a plurality of pipes for conducting the heat medium therein, a first control unit, and a second control unit embedded in the ground. Part of the pipe is a connection pipe that connects the second control unit and the compression unit, and the heat medium is sent from the second control unit to the compression unit. The first control unit switches the direction of the heat medium in the piping, and the second control unit switches the direction of the heat medium and collects heat from the plurality of heat exchange units. A geothermal heat pump device characterized in that selection switching between use and non-use in a heat radiation operation is performed. The geothermal heat pump device according to claim 1, wherein the first control unit includes a four-way, three-way, or two-way heat medium direction switching valve. 3. The geothermal heat pump device according to claim 1, wherein the second control unit includes an electromagnetic valve and a four-way, three-way, or two-way heat medium direction switching valve. The geothermal heat pump device is composed of a first heat exchanging unit, a second heat exchanging unit, and a third heat exchanging unit having a composition ratio of 3 to 3 to 4, and the second control unit The first heat exchanging unit, the second heat exchanging unit, and the third heat exchanging unit are switched to use or non-use in the heat collecting or heat radiation operation. The heat medium is sent from the second control unit to the compression unit via a connecting pipe that connects the control unit and the compression unit. The geothermal heat pump device according to 3. The geothermal heat pump device is composed of a first heat exchange unit and a second heat exchange unit, and the second controller exchanges between the first heat exchange unit and the second heat exchange unit. Switching between use and non-use in heat collection or heat dissipation is performed, and at that time, from the second control unit via a connection pipe connecting the second control unit and the compression unit. The geothermal heat pump device according to claim 1, 2, 3, or 4, wherein the heat medium is delivered to the compression unit. A plurality of heat exchanging units buried in the ground are provided with a capillary tube at the bottom of the heat exchanging unit, and the capillary tube allows the heat medium in the pipe to flow in two phases, a liquid phase and a gas phase. And a heat exchange section provided with the capillary tube is disposed inside a cylindrical body filled with a liquid. Or the geothermal heat pump apparatus of 5.