JPH03204522A - Pump arrangement for refrigerant - Google Patents

Abstract

PURPOSE:To prevent a leak of a current from a connecting element without fail by a construction wherein a connecting element vessel for connecting a power line for driving a pump for a refrigerant and a lead wire is provided in isolation above the main body of the pump for the refrigerant, a conduit joining the connecting element vessel and the pump for the refrigerant and having the lead wire inserted is fitted, and a heating means is fitted to the vicinity of the upper end part of the conduit. CONSTITUTION:A connecting element connecting a power line 9 for driving a pump arrangement for a refrigerant with a lead wire 24 in a terminal is provided in isolation above a pressure vessel 13. A conduit 32 joining an insulating terminal connecting vessel 31 and the pressure vessel 13 and having the lead wire 24 inserted is fitted, and moreover an electric heater for vaporizing a liquid-phase refrigerant 14 filled up in the insulating terminal connecting vessel 31 is fitted to the upper end part of the conduit 32. By heating the upper end part of the conduit 32, the liquid 32. By heating the upper end part of the conduit 32, the liquid-phase refrigerant 14 in the insulating terminal connecting vessel 31 is vaporized and an electric resistance is increased. A current from a power source is prevented form leaking to the pressure vessel 13 along the refrigerant 14 from the connecting element with the lead wire 24, and thus the safety against a leak is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigerant pump device for transferring refrigerant in a heating device using a refrigerant, and particularly relates to a connection of a power source for driving a refrigerant pump. It is.

[Prior Art] Conventionally, as a means of heating a room, combustion heat is applied to a heat exchanger for heating a refrigerant, and the liquid phase refrigerant is vaporized and transferred to the indoor heat exchanger, where the refrigerant is condensed and liquefied. Some systems use the heat released at this time to provide heating.

The transfer of refrigerant in heating devices of this type is usually carried out using a refrigerant pump.

A conventional heating device of this type and a refrigerant pump used therein are shown in FIGS. 7 and 8.

FIG. 7 is a circuit diagram showing a heating device using a conventional refrigerant pump, and FIG. 8 is a longitudinal sectional view showing a conventional refrigerant pump.

In FIG. 7, (A) is an outdoor unit, and (B) is an indoor unit. (1) is a refrigerant pump that is installed in the outdoor unit (A) and pumps and circulates refrigerant; (2)
is a combustor that burns fuel such as oil or gas supplied through a fuel supply pipe (3) by a burner (not shown);
4) is heated by the combustion gas of the combustor (2),
A refrigerant heating heat exchanger (6) evaporates and vaporizes the liquid-phase refrigerant fed through the discharge pipe (5) of the refrigerant pump (1); A
) is an exhaust stack that exhausts the air to the outside.

(7) is a suction pipe that introduces the refrigerant into the refrigerant pump (1), (8) is a power supply controller that controls the power supplied to each component such as the refrigerant pump (1), and (9) is the above-mentioned power supply controller. Power controller (
8) is a power line connected to the refrigerant pump (1), and each component from the refrigerant pump (1) to the power line (9) is housed in the outdoor unit (A). (1
0) is an indoor heat exchanger that is disposed inside the indoor unit (B) and exchanges heat between the refrigerant and the surrounding air; (11);
(12) is a connection pipe that connects the refrigerant pipes in the outdoor unit (A) and the indoor unit (B).

In the above refrigerant circuit, the refrigerant flows from the refrigerant pump (1) to the discharge pipe (5), the refrigerant heating heat exchanger (4), and the connecting pipe (
11), then the indoor heat exchanger (10) and the connecting pipe (12).
), then the suction pipe (7).

In Fig. 8, (13) is a steel pressure vessel that forms the outer wall of the refrigerant pump device (1), and has a cup-shaped member and a cylindrical member joined by welding, etc., and has a pressure-resistant structure with no liquid leakage. This is what I did. (14) is a refrigerant, which is in a liquid phase within the pressure vessel (13). (15) is a drive unit consisting of a motor that drives the refrigerant pump (1),
(16) is a stator, (17) is a rotor, and this rotation is transmitted to the mechanical part (19) via the shaft (18). (20) is a casing (21) that covers the mechanical part (19).
), the suction pipe (22) leads the refrigerant (14) into the mechanical part (
19) Suction hole for sucking refrigerant (14) into the interior (23)
is a discharge hole that discharges the refrigerant (14) made high pressure in the mechanical part (19).

(41) is a substantially disk-shaped partition wall that partitions the inside of the pressure vessel (13), and its peripheral end is fixed to the inner wall of the pressure vessel (13). The drive section (15) is located in the center of the partition wall (41).
) A bearing is attached to support one end of the shirt (18), and the end of the refrigerant (14) discharge pipe (5) and the drive unit (15) are fixed at appropriate positions on the surface. Child (16)
) is fitted with a sleeve (25) which holds a lead wire (24) for supplying power to the motor. (26) is a pressure vessel (
13) and connects the power wire (9) and lead wire (
24), one end of the lead wire (24) is attached to the connection part (42) on the inside of the pressure vessel (13) of this insulated terminal (26), and the other end is connected to the sleeve. (25), the stator (1) of the drive section (15)
6). (43) is injected from the injection port (44) provided in the pressure vessel (13), and the lead wire (2
4) is an insulating material that fills the space between the pressure vessel (13) containing the pressure vessel (13) and the partition wall (41), and has electrical insulation properties.
In addition, a resin material or the like that is not attacked by the refrigerant (14) is used.

Next, the operation of the conventional refrigerant pump configured as described above will be explained.

When heating operation is performed, in the combustor (2), fuel such as oil or gas discharged from the fuel supply pipe (3) is combusted by a burner (not shown), and the combustion gas is used to heat the refrigerant heating heat exchanger (4). ) is heated. The combustion gas is then discharged to the outside of the outdoor unit (A) from the exhaust stack (6).

On the other hand, the refrigerant (14) is passed through the refrigerant pump (1) from the discharge pipe (5) of the refrigerant pump (1) to the refrigerant heating heat exchanger (4) and the connecting pipe (11) to the indoor heat exchanger. (10
), connection pipe (12), refrigerant pump (1) suction pipe (
The refrigerant circulates through the refrigerant circuit in the order from 7) to the refrigerant pump (1). When the refrigerant (14) is heated in the refrigerant heating heat exchanger (4), the refrigerant (14) generally evaporates easily because it has a low boiling point. Then, the refrigerant (14) vaporized by evaporation is transferred to the indoor heat exchanger (10) of the indoor unit (B), where it exchanges heat with the surrounding air, radiates heat, and is condensed and liquefied. Conversely, the surrounding air is heated and the room is heated. The liquefied refrigerant (14) is returned into the refrigerant pump (1) from the suction pipe (7) of the refrigerant pump (1).

On the other hand, the liquid phase refrigerant (
14) fills the pressure vessel (13), a part of it is sucked into the casing (21) from the suction pipe (20), and further flows into the mechanical part (19) from the suction hole (22), Pressurized here, the drive unit (15) is discharged from the discharge hole (23).
) go inside. The refrigerant (14) is then transferred to the stator (16).
and the rotor (17), and is discharged from the discharge pipe (5) to the outside of the refrigerant pump (1).

Note that the power supply current that drives the refrigerant pump (1) is transmitted from the power supply controller (8) through the power supply line (9) to the insulated terminal (2).
6), and is further transmitted to the stator (16) of the drive unit through the lead wire (24) to rotate the rotor (17).

By the way, in heating using a refrigerant, heat is transferred using the phase change of the refrigerant, so a refrigerant that is easily vaporized or liquefied and has a large latent heat of vaporization is used.

Compared to water, antifreeze, etc., fluorocarbon-based refrigerants can reduce the amount of circulation when transferring the same amount of heat.

Therefore, the power consumption of the refrigerant pump (1) is low,
Further, there are advantages such as the diameter of the refrigerant piping can be reduced, manufacturing and installation workability is easy, and the cost of the equipment is low. For this reason, fluorocarbon-based refrigerants are also frequently used as refrigerants for heat pumps. However, fluorocarbon-based refrigerants generally have low electrical resistance, and when they are in the liquid phase,
It decreases even more. Therefore, in the conventional refrigerant pump (1), the space between the pressure vessel (13) and the partition wall (41) is not filled with the insulating material (43), and the liquid phase refrigerant (14) is not filled in this area. When the current flows through the power line (9), the current flowing through the power supply line (9) is transmitted through the partially liquid refrigerant (14) from the connection part (42) of the insulated terminal (26) to the lead wire (24). , flows into the pressure vessel (13). Therefore, there is a risk of power interruption due to the earth leakage breaker or electric shock, and it is not possible to ensure the insulation resistance value specified by the Electrical Appliance and Material Control Act.

Therefore, the insulating material (43) is placed in the space where the lead wire (24) passes between the pressure vessel (13) and the partition wall (41).
) to prevent leakage of current from the connection portion (43) of the insulated terminal (26). Note that a gas compressor is used to circulate the refrigerant for heat pumps, and in this case, the refrigerant in the gas compressor is in the gas phase, so it exhibits relatively high electrical insulation and the lead wires No special insulation measures are required at the connections.

[Problems to be Solved by the Invention] The conventional refrigerant pump device is configured as described above, and has a lead wire (24) between the pressure vessel (13) and the partition wall (41).
) is filled with an insulating material (43) to prevent leakage of current from the connection part (42) of the insulated terminal (26) of the power supply. There is no material that can withstand long-term contact with the refrigerant (14), and a large amount of insulating material (43) is required, and the insulating material (43) is injected into the pressure vessel (13) and solidified. There were disadvantages such as an increase in the number of manufacturing steps, such as additional steps, and an increase in the manufacturing cost of the refrigerant pump (1).

In addition, as another means to solve the insulation problem, for example, the drive part of the refrigerant pump (1) is not housed inside the pressure vessel (13), but the drive part and the mechanical part are connected by a magnetic coupling. However, there are those that transmit the rotational force of the drive part, or those that separate the drive part and mechanical part and use mechanical seals to prevent refrigerant from leaking into the drive part. Differential pressure is 20~30kg/
CD, there is a problem with the pressure resistance of the casing, and furthermore, if the transmitted power is large, the efficiency of the refrigerant pump device will decrease. Furthermore, in the latter case, there are problems such as leakage of refrigerant from the seal portion, a complicated structure due to the use of a mechanical seal, and high cost, all of which are impractical.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a refrigerant pump device for refrigerant circulation that can inexpensively and reliably prevent leakage of current from a connection with a power source and ensure safety. be.

[Means for Solving the Problems] This section - The refrigerant pump device according to the invention is characterized in that the connection container that relays the power supply line for driving the refrigerant pump and the terminal lead wire is isolated above the refrigerant pump main body. In addition to providing
A conduit in which a lead wire is inserted is connected to connect the connection container and the refrigerant pump, and further, heating is performed to vaporize the liquid phase refrigerant filled in the connection container near the upper end of the conduit. It has a means attached to it.

Further, in the refrigerant pump device according to the second invention, a connection portion container for relaying a power line for driving the refrigerant pump and a terminal lead wire is provided isolated above the refrigerant pump main body, and the connection portion By connecting the container and the refrigerant pump and attaching a conduit into which a lead wire is inserted, and filling the vicinity of the upper end of the conduit with gaseous refrigerant, the inside of the connection container is also filled with gaseous refrigerant. It is equipped with a gas phase refrigerant filling means.

[Operation] In this section of the invention, the refrigerant filled in the refrigerant pump also flows through the conduit into the connection container of the refrigerant pump driving power source, which is isolated from the refrigerant pump.

In this state, when the connection container near the upper end of the conduit or the upper end of the conduit is heated, the liquid phase refrigerant in the connection container is vaporized, and the electrical resistance of the refrigerant increases with this phase change. Therefore, while the refrigerant pump is operating, the electric power supplied from the power supply will not leak through the refrigerant from the connection portion with the lead wire to the refrigerant pump side.

Further, in the second aspect of the present invention as well, liquid-phase refrigerant can flow through the conduit into the connection container of the refrigerant pump driving power source that is isolated from the refrigerant pump.

In this state, by filling the vicinity of the upper end of the conduit with gas-phase refrigerant, the inside of the connection container is also filled with gas-phase refrigerant, and as this gas-phase refrigerant fills, the electrical resistance of the refrigerant increases. increases. For this reason, while the refrigerant pump is operating as in the first invention, the power supplied from the power supply does not leak through the refrigerant from the connection with the lead wire to the refrigerant pump side. .

[Example] Hereinafter, each embodiment of the bookcase and the second invention will be described.

First Embodiment of the First Invention> First, the first embodiment of the invention in this section will be described based on FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional view showing a refrigerant pump device according to a first embodiment of the invention in this section, and FIG. 2 is a circuit diagram showing a heating device using the refrigerant pump device of FIG. 1. Note that in the drawings, the same reference numerals as in FIGS. 7 and 8 indicate parts that are the same as or correspond to conventional components, so their explanation will be omitted here.

In the figure, (31) is a box-shaped insulated terminal connection container located at a predetermined distance from the pressure vessel (13) and above the pressure vessel (13). The connection part is the main body of the container. A power line (from the power supply controller (8)) is connected to the opening of the insulated terminal connection container (31).
9) is attached.

One end of the lead wire (24) is connected to the insulated terminal connection container (3).
1), the other end enters the pressure vessel (13), and the sleeve (25) is connected to the stator (16) of the drive unit (15) of the refrigerant pump (1). It is connected to the. (32) is a conduit made of ceramics etc. whose one end is attached to the bottom of the insulated terminal connection container (31) and the other end is fixed to the side of the pressure vessel (13). A lead wire (24) is housed therein. The insulated terminal connection container (31) and the conduit (32)
are installed in a sealed manner to prevent liquid or gas leakage from each joint.

Further, the inner diameter of the conduit (32) is set to the minimum size into which the lead wire (24) can be inserted. (33) is an electric heater that heats the upper end of the conduit (32) using a current from the power supply controller (8).

The liquid phase refrigerant (14) not only fills the entire interior of the pressure vessel (13) by operating the refrigerant pump (1), but also fills the insulated terminal connection vessel (31) through the conduit (32). ing.

In addition, a box-shaped box is provided at a position a predetermined distance away from the insulated terminal (26) to which the power supply line (9) is connected and the pressure vessel (13), and is disposed above the pressure vessel (13). The insulated terminal connection container (31) constitutes the connection portion container of this embodiment.

Next, the operation of the refrigerant pump device of this embodiment configured as described above will be explained.

While the pressure vessel (13) and the insulated terminal connection vessel (31) are filled with the liquid phase refrigerant (14), the electric heater (33)
) is energized, the upper end of the conduit (32) and the inside of the insulated terminal connection container (31) are heated, and the refrigerant (14) is heated.
) temperature increases.

On the other hand, the inner diameter of the conduit (32) is set to the minimum size that allows the lead wire (24) to be inserted, and the gap between the lead wire (24) and the lead wire (24) is made small, so that the flow of the refrigerant (14) is almost suppressed. Therefore, heat hardly moves with the flow of the refrigerant (14), and only the mounting part of the electric heater (33) accumulates heat, and the refrigerant (14) in this part evaporates, and the insulated terminal connection container ( 31) is filled with a gas phase refrigerant (14) (in Fig. 1, the insulated terminal connection container (31)
The refrigerant (14) inside is in a gas phase).

In addition, since the insulated terminal connection container (31) is arranged above the pressure vessel (13), the insulated terminal connection container (31)
The gaseous refrigerant (14) generated within the insulated terminal connection container (31) is always filled with the insulated terminal connection container (31) without descending the conduit (32) and flowing into the pressure container (13).

As a result, the lead wire (2) at the insulated terminal (26)
Even if current leaks from the connection with the insulated terminal connection container (31), the refrigerant (14) in the insulated terminal connection container (31) has vaporized and increased its electrical resistance, so it is insulated by the refrigerant (14) and the pressure container ( 13
) does not flow.

In addition, in the heating operation, the refrigerant (14) operates in the same manner as in the conventional example except for the above, is brought to high pressure within the refrigerant pump (1), and circulates through each refrigerant circuit.

By the way, from the stop to the start of the heating operation, the power supply to the electric heater (33) is stopped, but at this time, the gas phase refrigerant (14) in the insulated terminal connection container (31) is affected by the ambient temperature. It is cooled and changes to a liquid phase. Therefore, before starting the operation of the refrigerant pump (1), the electric heater (33)
After the refrigerant (14) in the insulated terminal connection container (31) is gasified by energizing the refrigerant pump (14) for a predetermined period of time, the drive section of the refrigerant pump (1) starts operating.

Although the electric heater (33) is attached near the upper end of the conduit (32), it can also be attached to the outside of the insulated terminal connection container (31).

In this way, the refrigerant pump device of the above embodiment has the power supply line (9) for driving the refrigerant pump device and the terminal lead wire (2).
4) is provided isolated above the pressure vessel (13), and an insulated terminal connection container (31) as a connection container and an insulated terminal connection container (31) are provided in the connection portion. The pressure vessel (13) is connected to the conduit (32) into which the lead wire (24) is inserted, and the insulated terminal connection vessel (31) or the conduit (32) is attached.
) is provided with an electric heater (33) as a heating means for vaporizing the liquid phase refrigerant (14) filled in the insulated terminal connection container (31).

Therefore, according to the above embodiment, the insulated terminal connection container (
31) Alternatively, by heating the upper end of the conduit (32), the liquid phase refrigerant (14) in the insulated terminal connection container (31) is heated.
) is vaporized, and as a result of this phase change, the electrical resistance of the refrigerant (14) increases. Therefore, while the refrigerant pump (1) is operating, the current from the power source will not leak through the refrigerant (14) from the connection with the lead wire (24) to the pressure vessel (13), ensuring safety against electrical leakage. It is possible to ensure sex.

<Second Embodiment of the First Invention> Next, a second embodiment of the invention in this section will be described using FIG. 3.

FIG. 3 is a circuit diagram showing a heating device using a refrigerant pump device, which is a second embodiment of the invention in this section.

In the figure, the same reference numerals as in FIG. 2 are the same as or corresponding to the constituent parts of the first embodiment, so the explanation thereof will be omitted here.

In the figure, (31) is an insulated terminal connection container that is isolated above the pressure vessel (13), contacts the refrigerant piping at the outlet of the refrigerant heating heat exchanger (4), and is attached in a good heat conductive state. (31), the power line (9) from the power controller (8)
) and the lead wire (24). The contact portion between the refrigerant piping at the outlet portion of the refrigerant heating heat exchanger (4) and the insulated terminal connection container (31) may be formed by forming both opposing contact surfaces flat, or by forming the contact area around the pipe-shaped refrigerant piping. The contact area is increased by forming the insulated terminal connection container (31) into a double cylindrical shape so as to cover the refrigerant pipe and the outside of the insulated terminal connection container (31) with a heat insulating material to increase thermal efficiency. It is like that.

The refrigerant pump device of the second embodiment configured as described above connects the insulated terminal connection container (31) to the refrigerant heating heat exchanger (
4) Since it is attached to the refrigerant pipe at the outlet portion for heating, the same operation as in the first embodiment can be expected. In particular, in the second embodiment, since the insulated terminal connection container (31) is attached to the refrigerant pipe at the outlet of the refrigerant heating heat exchanger (4), the liquid phase refrigerant in the insulated terminal connection container (31) The refrigerant (14) is heated and gasified by partially exchanging heat with the refrigerant (14) heated by the refrigerant heating heat exchanger (4).

In addition, during heating operation, the burner of the combustor (2) is first ignited, and the refrigerant (1) in the insulated terminal connection container (31) is ignited.
4) is vaporized, the drive unit (15) is activated.

By the way, it is also possible to install the insulated terminal connection container (31) at an appropriate position close to the refrigerant heating heat exchanger (4) or the exhaust pipe (6), and heat it by heat transfer from these nearby parts. be.

In this way, the refrigerant pump device of the second embodiment has the power supply line (9) for driving the refrigerant pump device and the terminal lead wire (2).
4) is provided isolated above the pressure vessel (13), and the insulated terminal connection container (31) as a connection container is used as a refrigerant heating heat exchanger that serves as a heating means for the refrigerant (14). (4) A heat exchanger for heating the refrigerant (4) such as refrigerant piping at the outlet portion is installed in the vicinity, and a lead wire (24) is installed between the insulated terminal connection container (31) and the pressure container (13). A conduit (32) into which is inserted is attached.

Therefore, according to the second embodiment, the same effects as the first embodiment can be expected. In particular, in the second embodiment,
The refrigerant (14) in the insulated terminal connection container (31) is heated by the vicinity of the refrigerant heating heat exchanger (4). Therefore, there is no need to separately provide a heater such as an electric heater (33), and the combustion heat of the combustor (2) can be used, so costs can be reduced.

Incidentally, in each of the above embodiments, as a heating means for the refrigerant (14), an electric heater (33) is attached or the heat near the refrigerant heating heat exchanger (4) is used. When carrying out this method, the refrigerant is not limited to this, but since the refrigerant is easily gasified by a slight temperature rise, it is also possible to use various heating means such as a heater using a heat storage material7. be.

<First embodiment of the second invention> Next, a first embodiment of the second invention will be described based on FIGS. 4 and 5.

FIG. 4 is a longitudinal sectional view showing a refrigerant pump device according to a first embodiment of the second invention, and FIG. 5 is a circuit diagram showing a heating device using the refrigerant pump device of FIG. 4. In addition, in the drawings, the same or corresponding numerals as those in the conventional example and each embodiment of the first invention are the same or corresponding components as in the conventional example and each embodiment of the first invention, so their explanation is omitted here. do.

In the figure, (34) is the first branch pipe provided near the upper end of the conduit (32), and (35) is the first branch pipe (34).
) installed in the conduit (32) below the branch position of
branch pipe (36) is a capillary tube interposed in the middle of the first branch pipe (34), (37) fixes the lead wire (24) in the conduit (32) and provides a flow path for the refrigerant (14). The band (38) blocking the refrigerant is a heating refrigerant outlet pipe which is an outlet of the refrigerant from the refrigerant heating heat exchanger (4).

In this embodiment, the heating refrigerant outlet pipe (38) of the refrigerant heating heat exchanger (4) is connected to the first branch pipe (34).
) and the upper end of the conduit (32) are connected via a capillary tube (36) so that the refrigerant (14) can flow therethrough. This heated refrigerant outlet pipe (38) is located below the insulated terminal connection container (31) and at the top of the other refrigerant circuits. Further, the suction pipe (7) of the refrigerant pump (1) and the conduit (32) are connected by the second branch pipe (35) so that the refrigerant (14) can flow therein. This second branch pipe (35)
It branches from the conduit (32) below the branch pipe (34). Also in the refrigerant pump device of this embodiment, an insulated terminal connection container (31) having a structure similar to that described in each of the above embodiments is arranged at a position separated from the pressure container (13) by a predetermined length. has been done. This insulated terminal connection container (31) is connected to the refrigerant pump (1) by a conduit (32).
) is supported by a pressure vessel (13), which constitutes the connection vessel of this embodiment. In addition, the above-mentioned insulated terminal connection container (31), conduit (32), first branch pipe (34),
The second branch pipe (35) and the capillary tube (36) are connected in a sealed manner, and the piping is arranged so that there is no liquid or gas leakage from each connection. Further, inside the insulated terminal connection container (31) and the conduit (32), there are lead wires (2
4) is inserted in a penetrating state. Therefore, the structure is such that when the refrigerant (14) flows into the conduit (32), it can also flow into the inside of the insulated terminal connection container (31). However, this refrigerant (14) is blocked by the band (37) and does not flow directly into the pressure vessel (13) in large quantities.

Next, the operation of the refrigerant pump device of this embodiment configured as described above will be explained. In addition, for convenience of explanation, the refrigerant (14) will be described here with reference numerals being divided into a liquid-phase refrigerant and a gas-phase refrigerant.

That is, (14a) indicates a liquid-phase refrigerant, and (14b) indicates a gas-phase refrigerant.

When heating operation is performed, the liquid phase refrigerant (14a) fills the pressure vessel (13) and the band (37)
Pressure is applied to the negative side. Although the band (37) blocks the counterflow path of the conduit (32), it physically lasts for a long period of time when the liquid phase refrigerant (1
4a) and a small amount of leakage occurs, but the difference between the discharge pressure on the pressure vessel (13) side of the band (37) and the suction pressure on the insulated terminal connection vessel (31) side is maintained. . The liquid phase refrigerant (14a) leaking through the band (37) in the conduit (32) rises in the liquid level in the conduit (32).

On the other hand, the refrigerant (14) discharged from the refrigerant pump (1) and circulating in the refrigerant circuit for heating operation is heated and vaporized by the refrigerant heating heat exchanger (4) to become a gas-phase refrigerant (14b). . Therefore, in the heating refrigerant outlet pipe (38) of the refrigerant heating heat exchanger (4), the refrigerant (14) is a gas phase refrigerant (
14b). Then, this gas phase refrigerant (14
b) radiates heat in the indoor heat exchanger (10), condenses and liquefies to become a liquid-phase refrigerant (14a), which flows into the refrigerant pump (1) from the suction pipe (7) of the refrigerant pump (1). return. In addition,
During such heating operation, the pressure in the refrigerant circuit is higher at the heating refrigerant outlet pipe (38) of the refrigerant heating heat exchanger (4) than at the suction pipe (7) of the refrigerant pump (1). It is in a state. Therefore, a part of the gas phase refrigerant (14b) discharged from the refrigerant heating heat exchanger (4) flows from the heating refrigerant outlet pipe (38) into the first branch pipe (34) and into the capillary tube (36). It flows. This capillary tube (36) acts as a resistance when the gas phase refrigerant (14b) flows, so the flow rate decreases. That is, the capillary tube (36) carries a large amount of gas phase refrigerant (1
4b) from entering the conduit (32). The gas phase refrigerant (14b) that has flowed into the conduit (32) via the capillary tube (36) fills the insulated terminal connection container (31) located at the top of the conduit (32), and
The liquid phase refrigerant (14a) inside is made to flow out from the second branch pipe (35). In this way, the refrigerant (14) flows out from the second branch pipe (35) because the lower end of the conduit (32) is shielded by the band (37), and the refrigerant (14) flows out from the pressure vessel (13).
This is because it is designed not to flow. Therefore, the liquid level of the liquid phase refrigerant (14a) in the conduit (32) is at the second level.
It descends to the lower end of the branch pipe (35). This conduit (3
The liquid phase refrigerant (14a) in 2) is stabilized at the above position, and then the gas phase refrigerant (14b) that has flowed into the conduit (32) from the first branch pipe (34) flows into the second branch pipe (32). It flows out from the tube (35). The liquid or gas phase refrigerant (14) flowing out from this second branch pipe (35) is transferred to the suction pipe (7) of the refrigerant pump (1), which is the lowest pressure part of the refrigerant (14) in this refrigerant circuit. ) and joins the heating refrigerant circuit.

In this way, in this embodiment, the insulated terminal connection container (31)
is disposed above the pressure vessel (13) via a conduit (32), and gas phase refrigerant (14b) is passed through a first branch pipe (34) near the upper end of the conduit (32). By supplying excess refrigerant (14) through the second branch pipe (35) and returning it to the suction pipe (7) of the refrigerant pump (1), a gas phase refrigerant ( 14b)
It has gas phase refrigerant filling means.

Therefore, during the heating operation, the inside of the insulated terminal connection container (31) is always filled with the gas phase refrigerant (14b). Therefore, if the lead wire (2) of the insulated terminal (26)
Even if current flows from the connection in 4), the insulated terminal connection container (
Since the gas phase refrigerant (14b) in the pressure vessel (31) has a large electrical resistance, it is insulated by this gas phase refrigerant (14b) and the pressure vessel (
No current flows through 13).

By the way, from the stop to the start of the heating operation, the burner of the refrigerant heating heat exchanger (4) stops burning.
The refrigerant (14) is not heated by the refrigerant heating heat exchanger (4). In addition, since the operation of the refrigerant pump (1) has also been stopped and the pressure within the refrigerant circuit is equalized, the gas phase refrigerant (14b) is transferred from the first branch pipe (34) to the conduit (
32) is not supplied. For this reason, the insulated terminal connection container (
31) may be filled with liquid phase refrigerant (14a). Therefore, before the refrigerant pump (1) starts operating, the refrigerant (14) is vaporized in the refrigerant heating heat exchanger (4) by combustion in the burner of the refrigerant heating heat exchanger (4). A gas phase refrigerant (14b) is passed through the branch pipe (34) of No. 1.
is supplied to the conduit (32), and after a certain period of time such that the gas phase refrigerant (14b) fills the insulated terminal connection container (31), the drive unit (15) of the refrigerant pump (1) is turned off. Start driving.

In this way, the refrigerant pump device of the above embodiment has the power supply line (9) for driving the refrigerant pump device and the terminal lead wire (2).
4) is provided isolated above the pressure vessel (13), and an insulated terminal connection container (31) as a connection container and an insulated terminal connection container (31) are provided in the connection portion. Connecting the pressure vessel (13) with a conduit (32) into which the lead wire (24) is inserted;
A gas phase refrigerant filling means is installed that fills the inside of the insulated terminal connection container (31) with the gas phase refrigerant (14b) by filling the vicinity of the upper end of the conduit (32) with the gas phase refrigerant (14b). It is.

Therefore, according to the above embodiment, the refrigerant pump (1)
When the insulating terminal (26) is driven, a gas phase refrigerant (14b) is introduced into the insulating terminal connection container (31), and the insulation of the insulating terminal (26) increases. Therefore, while the refrigerant pump (1) is operating, the current from the power source will not leak through the refrigerant (14) from the connection with the lead wire (24) to the pressure vessel (13), ensuring safety against electrical leakage. It is possible to ensure sex.

Second Embodiment of the Second Invention Next, a second embodiment of the second invention will be described with reference to FIG.

FIG. 6 is a circuit diagram showing a heating device using a refrigerant pump device according to a second embodiment of the second invention.

In the figure, the same reference numerals as in FIG. 5 are the same as or corresponding to the constituent parts of the first embodiment, so the explanation thereof will be omitted here.

In the figure, (39) is a solenoid valve provided in the middle of the first branch pipe (34) connecting the heating refrigerant outlet pipe (38) of the refrigerant heating heat exchanger (4) and the conduit (32); 40) is a liquid level detector disposed within the insulated terminal connection container (31). This liquid level detector (40) is connected to the insulated terminal connection container (31).
) is detected, and the signal is input to the power supply controller (8) to control the opening and closing of the solenoid valve (39).

By adopting this configuration, the insulated terminal connection container (
31) can be suppressed to the minimum amount that fills the insulated terminal connection container (31). Therefore, the gas-phase refrigerant (14b) does not pass through the indoor heat exchanger (10), and the refrigerant pump (1)
It is possible to reduce the amount of water that returns to the suction pipe (7), suppress a decrease in heating capacity, and enable efficient heating operation.

In this way, the refrigerant pump device of the above embodiment is the refrigerant pump device of the first embodiment with the addition of a solenoid valve (39) and a liquid level detector (40), and is different from the first embodiment. You can expect similar behavior. In particular, in the second embodiment, since the liquid level detector (40) is installed inside the insulated terminal connection container (31), the liquid phase refrigerant (
Since the presence or absence of 14a) can be reliably detected, reliability in preventing electric leakage is high.

By the way, in the refrigerant pump device of the first invention, the vicinity of the upper end of the conduit (32) is heated to convert the refrigerant (14) in the insulated terminal connection container (31) from the liquid phase refrigerant (14a) to the gas phase. By utilizing the increase in electrical resistance of the refrigerant due to phase conversion to the refrigerant (14b),
Ensures insulation, provides safety against electrical leakage at low cost, and
This is to be ensured. Therefore, the vicinity of the upper end of the conduit (32) in the first invention is heated, and the liquid phase refrigerant (14a) filled in the insulated terminal connection container (31) is heated.
The heating means for vaporizing is not necessarily limited to the means disclosed in each of the above embodiments. In addition, in the refrigerant pump device of the second invention, the gas phase refrigerant (14b) is supplied near the upper end of the conduit (32), and the refrigerant (14) in the insulated terminal connection container (31) is converted into a liquid phase. Utilizing the increase in electrical resistance of the refrigerant by replacing the refrigerant (14a) with a gas phase refrigerant (14b), the insulation of the insulated terminal connection container (31) is ensured, and safety against electric leakage can be achieved at low cost and , shall be ensured. Therefore, the vapor phase refrigerant (14b
) The gas phase refrigerant filling means for filling the inside of the insulated terminal connection container (31) with the gas phase refrigerant (14b) is not necessarily limited to the means disclosed in each of the above embodiments.

[Effects of the Invention] As described above, the refrigerant pump device of the invention in this section has a connecting container that relays the power line for driving the refrigerant pump and the lead wire at its terminal above the refrigerant pump. A conduit in which a lead wire is inserted is attached to connect the connection container and the refrigerant pump, and a liquid phase refrigerant filled in the connection container is installed near the upper end of the conduit. It is equipped with a heating means to vaporize.

Therefore, by heating the upper end of the connection container or the conduit, the liquid phase refrigerant in the connection container is vaporized, and the electrical resistance of the refrigerant increases as a result of this phase change. During operation, the current from the power source passes through the refrigerant from the connection with the lead wire and does not leak to the refrigerant pump, and during heating, the solvent can be vaporized with a small amount of heat. Thereby, safety against electrical leakage can be ensured at low cost and reliably.

Further, in the refrigerant pump device of the second invention, a connection container for relaying a power line for driving the refrigerant pump and a lead wire at its terminal is disposed above the refrigerant pump, and the connection portion container and the connection portion container are arranged above the refrigerant pump. By connecting the refrigerant pump with a conduit into which a lead wire is inserted, and filling the vicinity of the upper end of the conduit with gaseous refrigerant, the inside of the connection container is also filled with gaseous refrigerant. A gas phase refrigerant filling means is provided.

Therefore, by filling the connection container with gas phase refrigerant, the liquid phase refrigerant in the connection container can be removed, and as the connection container is filled with gas phase refrigerant, the electrical resistance of the refrigerant increases. Therefore, while the refrigerant pump is operating, the power supply current will not flow through the refrigerant from the connection with the lead wire and leak into the refrigerant pump, and during heating, the solvent can be vaporized with less heat. . by this,
Safety against electrical leakage can be ensured at low cost and reliably.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing a refrigerant pump device according to the first embodiment of the invention in this section, Fig. 2 is a circuit diagram showing a heating device using the refrigerant pump device of Fig. 1, and Fig. 3 is a This section - A circuit diagram showing a heating device using a refrigerant pump device according to a second embodiment of the invention, FIG. 4 is a longitudinal sectional view showing a refrigerant pump device according to a first embodiment of the second invention, 5 is a circuit diagram showing a heating device using the refrigerant pump device of FIG. 4, FIG. 6 is a circuit diagram showing a heating device using the refrigerant pump device according to the second embodiment of the second invention, FIG. 7 is a circuit diagram showing a heating device using a conventional refrigerant pump, and FIG. 8 is a longitudinal sectional view showing a conventional refrigerant pump. In the figure, 1: refrigerant pump 13: pressure vessel 14: refrigerant 14a: liquid phase refrigerant 14b: gas phase refrigerant 24: lead wire 31: insulated terminal connection container 32: conduit 33: electric heater 34: first branch Pipe 35: Second branch pipe. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. 0) N

Claims (2)

[Claims] (1) A connection between a pressure vessel of a refrigerant pump that transfers refrigerant, and a lead wire disposed above the pressure vessel and connected to a power supply line for driving the refrigerant pump and a lead wire connected to the refrigerant pump. a conduit that connects the connection container and the pump body and into which the lead wire is inserted; and a liquid phase refrigerant that heats the vicinity of the upper end of the conduit and fills the connection container. 1. A refrigerant pump device comprising: heating means for vaporizing refrigerant. (2) A connection that relays a pressure vessel of a refrigerant pump that transfers refrigerant, and a power supply line that is disposed above the pressure vessel and that is connected to the power supply line for driving the refrigerant pump and the lead wire that is connected to the refrigerant pump. a conduit into which the lead wire is inserted, and a gas-phase refrigerant filling the vicinity of the upper end of the conduit, so that the inside of the connection container is also cooled. 1. A refrigerant pump device comprising: a gas-phase refrigerant filling means for filling with a gas-phase refrigerant.