JPS6086358A - Heat pump type air-conditioning hot-water supply device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump type air-conditioning/heating/water supply system, and more specifically, eight coils, an indoor coil, an outdoor fill, and a hot water supply coil, are connected to a compressor by a refrigerant circulation circuit to provide cooling. This invention relates to an improvement in a heat pump type air-conditioning/heating/water supply device that is capable of switching between heating, hot water supply, cooling hot water supply, and defrosting modes of operation, and in which a coil that is not used during each mode of operation is connected to the low-pressure side. .

This type of heat pump type air-conditioning/heating and hot water supply system was previously proposed by the present applicant, for example, in Japanese Patent Application No. 58-1496.
No. 5 (filed on January 81, 1981, hereinafter referred to as the earlier application example).

) has been proposed by IC, and the example of this prior application will be explained based on FIG. 4. This device is as follows.

(1) is the compressor, (2) is the indoor coil, (3) is the outdoor coil, (4) is the hot water coil, and 0!9 is the indoor coil (2)
and an expansion valve that reduces the pressure of the refrigerant flow from the hot water supply coil (4) to the outdoor coil (3), and α0 is an expansion valve that reduces the pressure of the refrigerant flow from the hot water supply unit (4) and the outdoor unit (3) to the indoor unit (2). , αη is the liquid receiver, mark 11, (IL
f21m is a check valve, and each outdoor coil (3)
, which blocks the flow of refrigerant to the indoor coil (2) and the hot water supply coil (4), and (9) is an accumulator.

Each of these devices constitutes a switching mechanism (A) that switches to each operation mode using nine solenoid valves (SVl) to (SV, ), and the coils that are not used during each operation are used as refrigerant. It is designed to communicate with the low pressure side to prevent liquid accumulation.

For example, during cooling operation, (SV2), (SV4), (S
Open the compressor (1) - outdoor coil (3) -
Check valve 0 boiling - Receiver αη - Expansion valve low - Indoor coil (2
) - Accumulator (9) - Compressor (1) refrigerant circulation circuit performs cooling operation, while the hot water supply coil (4), which is not in use at this time, opens (SV8) and connects the accumulator (9) to the compressor. (1) is connected to the low pressure side.

Hereinafter, each operation of heating, hot water supply, cooling hot water supply, and defrost interrogation mode will be performed by controlling the opening and closing of the switching mechanism (A) consisting of the nine solenoid valves (SV) to (SV, ) as appropriate. ◎In other words, during heating operation, (SVl), (SV, '), and (SV7) are opened during heating operation. , open (SV8) to communicate with the low pressure side of the unused hot water supply coil (4), and open C5V), (SV), and (SV7) during hot water supply operation. Indoor coil that has been used but is not used (2)
(SV4) is opened for communication to the low pressure side, and (SV'), (SV), (SV,)t
Mt4 to perform cooling hot water supply operation, and connect the unused outdoor coil (
(SV7) is opened for communication to the low pressure side of 3), and
In the decrost operation during heating operation, (SV2) and (5V6) are opened in order to use the hot water supply coil (41) as the heat source, and (SV , ) is opened, L, decrost operation during hot water supply operation uses the indoor coil (2) as the heat source, (SV2),
(SV4) and (SV,) are left open, and (SV8) is left open for communication to the low-pressure side of the hot water supply coil (4) that is not in use.

In the case of the prior application example as mentioned above, in order to communicate with the low voltage side of the coil that is not used during each operation such as cooling, heating, hot water supply, cooling hot water supply, defrosting, etc., there is electricity that controls the opening and closing of valves that are not directly used for each operation. There are problems such as requiring a control circuit, complicating it, and increasing the overall cost.

The present invention has been made to improve the above-mentioned problems.The purpose of the present invention is to improve various operation modes such as cooling, heating, hot water supply, cooling hot water supply, defrosting during heating operation and hot water supply operation. The switching mechanism for switching to each operation, and the valve control circuit for communicating with the low pressure side of the coil that is not used during each operation are simplified, reducing the overall cost,
This prevents liquid refrigerant from accumulating in unused coils, prevents liquid from backing up to the compressor, and enables stable operation without causing a shortage of refrigerant circulation. To achieve this objective, a refrigerant circulation circuit is connected between the eight coils (indoor coil, outdoor coil, and hot water supply coil) and the compressor, and the operation mode is switched to cooling, heating, hot water supply, cooling hot water supply, defrosting, etc. In the heat pump type air-conditioning/heating/water supply system, a switching mechanism including the compressor and consisting of valves for switching between the respective operation modes is connected to each of the negative sides of the eight coils, the indoor coil, the outdoor coil, and the hot water supply coil. On the other hand, each side of each expansion mechanism that obtains a reciprocating flow that reduces the pressure of the flow from each coil and does not reduce the pressure of the flow to each coil is connected to the other side of each of the eight coils, and the negative side of each expansion mechanism is connected to the other side of each of the eight coils. The heat pump type air-conditioning/heating and hot water supply apparatus is characterized in that each other side having a low pressure is connected to a confluence point, and the coils that are not used during operation in each of the above-mentioned operation modes are communicated with the low pressure side. .

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows one example of a refrigerant circulation circuit of a heat pump type air-conditioning/heating/hot-water supply apparatus according to the present invention, and FIGS. 2 and 8 show other examples of the refrigerant circulation circuit, respectively.

11) is a compressor, (2) is an indoor coil, (3) is an outdoor coil, (4) is a hot water supply coil which is housed in the tank (5b), (9) is an accumulator, and (13), (
14) is an on-off valve that is closed during shipment and opened during installation.

Also, (6), (7), and (8) are in Section 1.2.8. Capillary tube, port 0), (1υ, (12 is a check valve, and the first capillary tube (6) is connected to the indoor coil (
2), and the check valve port α is connected to the indoor coil (2).
) is provided in parallel with the first capillary reach tube (6) to allow the flow to the indoor coil (2
) side, the expansion mechanism (B) is connected to the piping (2b) on the other side (2e) of the indoor coil (2), and the second capillary is connected to perform the same operation. The tube (7) and the check valve α1) constitute an expansion mechanism (C) on the outdoor coil (3) side, and the expansion mechanism (C) is connected to the outdoor coil (3).
) to the piping (8b) on the other side (8e), and the hot water coil (
4) Configure a billion (1) expander # (D), and the expansion mechanism (
D) to the piping (4b) on the other side (4e) of the hot water coil (4)
Connect to. Each expansion mechanism (B), (C), (D)
The low-pressure pipes (2c), (8c), and (4C) on the downstream side of each are configured to merge at a confluence point (E).

Next, (SVl) is a four-way switching valve (SV4) which will be described later from the discharge port of the compressor (1) when the solid line is connected to the indoor coil (2).
Piping (2a) or outdoor coil (3) on the negative side (2d)
The solenoid valve (SV,) that opens and closes the refrigerant passage to the piping (8a) on the - side (8d) is connected from the compressor (1) to the hot water coil (4).
) is a solenoid valve that opens and closes the refrigerant passage to the piping (4a) on the negative side (4d) of the hot water coil (4).
), a solenoid valve (SV
4) is a four-way switching valve that switches as shown by the solid line when it is off, and as shown by the broken line when it is on. )
It communicates with the piping (2a) on the - side (2d) of the outdoor coil (3), and on the other hand, it communicates with the suction port of the compressor (1) via the accumulator (9) from the piping (8a) on the - side (8d) of the outdoor coil (3). , Also, when the on-operation is activated, the refrigerant passage from the compressor (il discharge port) is (
SVl) to the - side (8d) of the outdoor coil (3), and on the other hand, the - side (2) of the indoor coil (2).
The piping (2a) of d) is connected to the suction port of the compressor (1) via the accumulator (9).

Solenoid valves (SV), (SV2), (SV8) as above
The four-way switching valve (SV4'I) and the compressor (1) are used to control switching to each operation mode, and these constitute a switching mechanism, and the switching mechanism (A) is used for the indoor filter as described above. (2), the outdoor fill (3), and the hot water supply fill 14) are connected to the - side piping (2a), (8a), and (4a), respectively, to form a refrigerant circulation circuit, and each valve is controlled to open and close by six valves. The operating conditions are as shown in Table 1.

Table 1 (○ mark: open, × mark: closed) (Note) SV4 off is in the solid line position, on is in the dotted line position, that is, when cooling, (SVl) is open, (SV4) is on,
Compressor (1) Discharge port - (SVl) - (SV4) - Outdoor coil (3) - Capillary (7) - Low pressure piping (8C
) - Confluence point (E) - Check valve scream 1 Indoor coil +21 - (
5V4) - Accum L' -1 + 91 - Compressor (1) Inlet cycle is formed to cool the water supply coil (4), which is not used at this time, is connected to the capillary (8) of the expansion mechanism CD) - low pressure piping (4c) - Junction (E) - Check valve O
I - Indoor coil 121 - (5V4) - Accumulator (9) - Compressor (1) communicates with the suction port to the low pressure side.

Also, when supplying hot water for cooling, open (SV2), turn on (SV4), compressor (1) discharge port - (SV, ) - hot water supply coil (
4) - Capillary (8) - Low pressure piping (4c) -i&-
Flow point (E) - check valve scream 1 indoor coil + 2) - (SV,
) - Accumulator (9) - Compressor (1) Inlet cycle is formed to supply cooling and hot water, and the outdoor coil (3) which is not used at this time is connected to the capillary (7) of the expansion mechanism (C).
) - Piping (8c) - Junction (E) - Check valve (1 (1 - Indoor coil 121 - (SV4) - Accumulator (9)
- communicates with the low pressure side to the compressor (1) inlet;

Next, when supplying hot water, open (SV,), compressor (1) discharge port - (5V2) - hot water supply coil (4) - capillary = (
8) - Low pressure piping (4c) - Confluence point (E) - Check valve αB -
Outdoor coil (3) - (SV4) - Accumulator (9)
- The compressor (1) inlet cycle is formed to supply hot water, and at this time, the unused indoor coil (2) is connected to the capillary (6) of the expansion mechanism (B) - low pressure pipe (2c) - confluence point (E) - Check valve a1) - Outdoor coil (31 - (SV4
) - accumulator (9) - communicates to the compressor (1) suction to the low pressure side.

Also, during heating, open (5V1) and compressor (1) discharge low (SV'I-(SV8)-indoor coil +21-
4-? Pillary (6) - Low pressure piping (2C) - Confluence (E
) - Check valve αD - Outdoor coil 131 - (5V4) - Accumulator (9) - Compressor (1) The inlet cycle is formed to perform heating, and the hot water coil (
4) is the capillary (9) of the expansion mechanism (D) - low pressure piping (4c) - confluence (E) - outdoor coil +31 - (5V
4) - Accumulator (9) - communicates to the compressor (1) suction to the low pressure side.

Furthermore, for defrost during hot water supply and defrost during heating, open (SV), (5V8), turn (SV4) on,
Compressor (1) Discharge low (SV,) - (SV4) - Outdoor: l Ile (31 - Capillary (7) - Low pressure piping (
8C) - Flows from the confluence point (E) and branches from the confluence point (E), one to the check valve 111 - indoor coil (2) - accumulator (9) - compressor (1) suction port, the other flows to check valve α2 - hot water supply coil +41 - (5V8) - accumulator (9) - compressor (1) suction, two cycles are formed and the outdoor coil (3) is defrosted. During defrost operation, the cycle is reversed, so when hot water is being supplied, it is sent to the hot water coil (4), and when heating, it is sent to the indoor coil (2).
Since each has an adverse effect on the heat source, the hot water coil (4)
and the indoor coil (2), thereby simultaneously acquiring heat from both to reduce the negative effects.

The example in Figure 1 is as described above, but next we will explain the example in Figure 2.The example in Figure 2 differs from the example in Figure 1 in the position of the solenoid valve (SVl) of the switching mechanism (5). But the first
In the example shown, the compressor is interposed between the four-way switching valve (SV4) and the four-way switching valve (SV4), whereas in the example shown in FIG.
, ) and the outdoor coil (3), and the opening/closing control of the device is slightly different from the example shown in FIG. 1, but is almost the same, so a description thereof will be omitted.

The example in FIG. 8 is also an example of a design change of the switching mechanism (A), and the switching mechanism (A) in FIG. 4 of the prior application example is used as the switching mechanism FA).
Similar to, but different from, the example in Figure 8, the solenoid valve (5V6), (S
The example in Fig. 8 shows that the circuit configuration of the device of the present invention is possible without these two solenoid valves, and the opening/closing control of the valves is similar to that shown in Fig. 4 above. Since they are similar, the explanation will be omitted. There are many other examples of switching mechanisms that can be used.

In addition, in the examples in FIGS. 1 to 8, the expansion mechanisms CB), (
C) and (D) each capillary tube (6)
, (7), (8), The flow from each coil was reduced in pressure by a combination of check valves [lα, C11) and C2, and the flow to each coil was made to have a reciprocating flow without pressure reduction, but the same operation was performed. It is possible to replace the valve with an electric expansion valve that controls full open, fully close, and expansion (see Japanese Patent Application Laid-Open No. 56-49856 for a specific example of an electric expansion valve).

The example of the present invention is as described above, but the present invention connects eight coils, the indoor coil (2), the outdoor coil (3), and the hot water supply coil (4), with the compressor through a refrigerant circulation circuit. In the heat pump type air-conditioning/heating/water supply device, the indoor coil (2), the outdoor coil (3),
Each negative side (2d) of the eight units of the hot water supply coil (4),
(8d) and (4d) are respectively connected to the switching mechanism (A) which includes the compressor (1) and is made up of valves and switches to each of the operating modes, while the other side (2
e), (8e), and (4e), each expansion mechanism (B), (C), and (D) that reduces the pressure of the flow from each coil and obtains a reciprocating flow without reducing the pressure of the flow to each coil. Side (B), (C
) and (Dl) respectively, and connect the other sides (B2), (C2), and (B2) of the expansion mechanisms (B), (C), and (D), which are always at low pressure, to the confluence point (E ), and the coils that are not used during each of the above operating modes are connected to the low-pressure side.The heat pump type air-conditioning, heating, and hot-water supply system is characterized in that the coils are connected to the A switching mechanism (A
) and each expansion mechanism that communicates with the low pressure side of the unit that is not used during each operation, in particular, each expansion mechanism is necessary for the refrigerant circulation circuit configuration.
, (C1, (D) to each low pressure piping (2c), (8c), (
Because of the unique configuration in which the valves merge into the junction point (E) at point 4c), the same function can be achieved even with a small number of valves to control, and in the end, the electric circuit that controls opening and closing of the container is simplified. Therefore, each of the above-mentioned operation modes can be performed at a low overall cost, and since liquid refrigerant does not accumulate in unused units, there is no risk of liquid backflow to the compressor, and there is no shortage of circulating refrigerant. The feature is that each operation of each of the above-mentioned operation modes can be performed stably.

[Brief explanation of drawings]

FIG. 1 shows an example of a refrigerant circulation circuit of a heat pump type air-conditioning/heating/water supply device according to the present invention, FIGS. 2 and 8 show other examples of the same refrigerant circulation circuit, and FIG. FIG. 2 is a diagram showing a refrigerant circulation circuit of an air conditioning/heating/hot water supply device. l...Compressor, 2...Indoor coil, 8...Outdoor coil, 4...Hot water supply coil, A...Switching mechanism,
B, C, D... Expansion mechanism, E... Confluence point. 16- Figure 1

Claims (1)

[Claims] (1) A refrigerant circulation circuit connects eight coils: indoor coil (2), outdoor coil (31), and hot water supply coil (4) to the compressor (1) for cooling, heating, hot water supply, cooling hot water supply, and defrosting. In the heat pump type air-conditioning/heating water supply device which is configured to switch to each operation mode such as, the indoor coil (2)
, the outdoor coil (3), and the hot water supply coil (4), each negative side (2d), (8d), (4d) of the eight coils includes the compressor (1) and valves, and is adapted to each of the operating modes. On the other hand, the flow from each coil is reduced in pressure to the other side (2e), (8e), and (46) of the eight coils, and the flow to each coil is reciprocated without pressure reduction. Connect the negative sides (B1), (C1), (Dl) of each expansion mechanism (B), (C) and S (D) that obtain the flow, respectively, and connect the expansion mechanisms (B), (C), ( The other sides (B2), (C2), and (B2), which always have low pressure of D), are connected to the confluence point (E
), and the coils which are not used during each of the above-mentioned operation modes are connected to the low pressure side.