JPS62142965A - Heat pump 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 Field of Industrial Application The present invention relates to a heat pump device for improving heat exchange efficiency for air conditioning, refrigeration, and the like.

2. Description of the Related Art Conventionally, as a heat pump device aimed at improving heat exchange efficiency, there is a Hi/Re/Li circuit (developed by Westinghouse) shown in FIG.

In Fig. 4, the main functional elements are a compressor 1, a condenser 2, a throttle 3, an evaporator 4, and an accumulator 5, and a refrigerant pipe connecting the condenser 2 and the throttle 3 is arranged in a heat exchange relationship with the accumulator 5. However, the throttle 3 is configured to adjust the degree of subcooling of the refrigerant at the outlet of the condenser 2. As shown in the Mollier diagram of FIG. 5, the outlet of the evaporator 4 is set to eight wet points,
To prevent liquid back to the compressor 1, the accumulator 5
By exchanging heat with the amount of heat at point B-C of the high-temperature refrigerant flow at the outlet of the condenser 2, the state of the refrigerant sucked into the compressor 1 becomes a saturated gas state. By doing the above,
The state of the refrigerant in the evaporator 4 is in a gas-liquid two-phase region over the entire region, and as shown in FIG.
, which improves heat exchange efficiency and improves the efficiency of the cycle as a whole.

Problems to be Solved by the Invention However, with the above configuration, as is clear from the Mollier diagram in FIG. There is a superheated gas region with poor performance, and no attempt has been made to improve efficiency on the condenser 2 side.
The problem was that the efficiency of the cycle as a whole was not sufficiently improved.

The present invention solves such conventional problems, and includes an evaporator,
The purpose is to improve the efficiency of the entire cycle by bringing the refrigerant throughout the entire interior of the condenser into a gas-liquid two-phase state.

Means for Solving the Intermediate Point In order to solve the above-mentioned interstitial point, the heat pump device of the present invention arranges the refrigerant pipe line connecting the condenser and the expansion device in a heat exchange relationship with the accumulator. This system includes a refrigerant branch pipe and recirculation means for recirculating a portion of the liquid refrigerant in the refrigerant pipe at the inlet of the throttling device to the compressor discharge pipe after replacement.

Effect of the Invention With the above-described configuration, the present invention exchanges heat between the low-temperature refrigerant discharged from the evaporator and the high-temperature refrigerant discharged from the condenser in the accumulator, thereby changing the refrigerant state at the evaporator outlet into a gas-liquid two-phase region. By setting the refrigerant state at the outlet to a gas-liquid two-phase region, and by recirculating a portion of the liquid refrigerant in the throttle device inlet refrigerant pipe, which has become supercooled through heat exchange in the accumulator, to the compressor discharge pipe. , the refrigerant state at the condenser inlet is also gas-liquid 2
The refrigerant in both the evaporator and the condenser is in a gas-liquid two-phase state with a high heat transfer coefficient, improving the efficiency of the entire cycle.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In Fig. 1, 1 is a compressor, 2 is a condenser, 3 is a throttle device, 4 is an evaporator, and 5 is an accumulator, which are connected by an annular refrigerant pipe to connect the condenser 2 and the throttle device 3. The refrigerant pipe 6 is arranged in a heat exchange relationship with the accumulator 5. A refrigerant branch pipe 7 is provided from the refrigerant pipe 6 after the refrigerant pipe 6 has exchanged heat with the accumulator 5, and is connected to the suction side of an ejector 9 provided in a discharge pipe 8 of the compressor 1.

The ejector 9 uses the discharge gas of the compressor 1 as a driving flow, sucks a part of the supercooled liquid refrigerant in the refrigerant pipe line 6 through the refrigerant branch pipe 7, and produces a refrigerant mixture of the discharge gas and the suctioned supercooled liquid refrigerant. is sent to condenser 2.

The effects of the above configuration will be explained in conjunction with the Mollier diagram shown in FIG. The discharge gas in the discharge pipe 8 of the compressor 1 is in the superheated gas region at the entry point on the Mollier diagram in FIG. The ejector 9 uses the discharged gas as a driving flow to
A part of the supercooled liquid refrigerant at point C is sucked through the refrigerant branch pipe 7, and at the outlet of the ejector 9, the eight discharged gas points and a part of the supercooled liquid refrigerant at point C are mixed to form gas-liquid 2. It becomes the phase region G point and is sent to the condenser 2. The refrigerant radiates heat in condenser 2, and
At the outlet, the gas-liquid two-phase region becomes point C, and the refrigerant is sent to the refrigerant pipe 6 arranged in a heat exchange relationship with the accumulator 5, where it exchanges heat with the low-temperature unevaporated refrigerant in the accumulator 5, resulting in a supercooled liquid state C.
It becomes a point. The supercooled liquid refrigerant at point C is depressurized by the throttling device 3, becomes a gas-liquid two-phase region, enters the evaporator 4, absorbs heat there, and flows from the evaporator 4 to the accumulator 5 at point E, which is in a gas-liquid two-phase region. Sent. Inside the accumulator 5, heat is exchanged with the high-temperature refrigerant in the refrigerant pipe 6, and the refrigerant reaches point F and is sucked into the compressor 1.

As mentioned above, by arranging the refrigerant pipe line 6 connecting the condenser 2 and the expansion device 3 in a heat exchange relationship with the accumulator 5,
The refrigerant state at the exit of the condenser 2 and the exit state of the evaporator 4 can be made into a gas-liquid two-phase region state. In addition, a refrigerant branch pipe 7 is provided which branches off from the refrigerant pipe 6' after heat exchange with the accumulator 5, and serves as a means for recirculating a part of the supercooled liquid refrigerant to the discharge pipe 8 of the compressor 1. By providing the ejector 9 that uses gas as the driving flow, the ejector 9 uses the compressor discharge gas as the driving flow to suck a part of the supercooled liquid refrigerant in the refrigerant pipe line 6' through the refrigerant branch pipe 7, and superheat it. By mixing it with the compressor discharge gas in the gas region, the inlet state of the condenser 2 is brought into the gas-liquid two-phase region.

As explained above, by adopting the configuration of the present invention,
Since the refrigerant throughout the interior of both the condenser 2 and the evaporator 4 is in a gas-liquid two-phase state with a high heat transfer coefficient, the efficiency of the entire cycle is improved. Further, as a recirculation means for recirculating a part of the supercooled liquid refrigerant in the refrigerant pipe line 6 to the discharge pipe 8 of the compressor 1, an ejector 9 using the compressor discharge gas as a driving flow is used. Since no power is required, the structure is simple and an energy-saving recirculation configuration is possible.

Next, another embodiment of the present invention will be described using FIG. 2. The difference in FIG. 2 from the above embodiment is that a refrigerant liquid circulation pump 10 is used as a refrigerant branch for recirculating a part of the supercooled liquid refrigerant in the refrigerant pipe line 6 to the discharge pipe 8 of the compressor 1. According to this structure, since the power source of the refrigerant liquid circulation pump 10 is external,
Flow rate adjustment is easy, and according to fluctuations in cycle conditions,
This has the effect that the amount of recirculation can be adjusted optimally.

Effects of the Invention As described above, the heat pump device of the present invention provides the following effects.

(1) A compressor, a condenser, a throttling device, an evaporator, and an accumulator are connected by an annular refrigerant pipe, and a refrigerant pipe connecting the condenser and the throttling device is arranged in a heat exchange relationship with the accumulator, and the accumulator A refrigerant branch pipe and recirculation means are provided to recirculate part of the liquid refrigerant in the refrigerant pipe to the compressor discharge pipe after heat exchange with the refrigerant, so the refrigerant in the entire internal area of both the condenser and evaporator is Since it can be formed in a gas-liquid two-phase state with a high heat transfer coefficient, it has the effect of improving the efficiency of the entire cycle.

(= As a means of recirculating a part of the liquid refrigerant in the refrigerant pipe after heat exchange with the accumulator to the compressor discharge pipe,
By configuring the ejector using the compressor discharge gas as a driving flow, no external power is required, resulting in a simple structure and energy saving.

(3) As a means for recirculating a part of the liquid refrigerant in the refrigerant pipe line after heat exchange with the accumulator to the compressor discharge pipe,
By configuring the refrigerant liquid circulation pump in a refrigerant branch pipe, the power source for the refrigerant liquid circulation pump is external, making it easy to adjust the flow rate. This has the effect that it can be adjusted optimally.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a heat pump device showing one embodiment of the present invention, Fig. 2 is a block diagram of a heat pump unit 1 showing another embodiment of the present invention, and Fig. 3 is a Mollier wire diagram showing the action of the present invention. 4 is a circuit configuration diagram showing a conventional example, FIG. 5 is a Mollier diagram showing the operation of the conventional example, and FIG. 6 is a phase change heat transfer characteristic diagram of a refrigerant. 1... Compressor, 2... Condenser, 3...
... Throttle device, 4... Evaporator, 5...
...Accumulator, 7...Refrigerant branch pipe, 8.
... Compressor discharge pipe, 9 ... Ejector,
10...Refrigerant liquid pump. Name of agent: Patent attorney Masao Nakao and 1 other person 2nd
Figure 3 - Enthalby Figure 4 Figure 6 of the drawing l'γ bow C (knee to the content) f-' = L) Figure 5/62 Ayae 4 Shii Taruro procedure amendment writing) 1986 March 72nd

Claims (3)

[Claims] (1) A compressor, a condenser, a throttling device, an evaporator, and an accumulator are connected by an annular refrigerant pipe, and a refrigerant pipe connecting the condenser and the throttling device is arranged in a heat exchange relationship with the accumulator, and the accumulator A heat pump device equipped with a refrigerant branch pipe and recirculation means for recirculating part of the liquid refrigerant in the refrigerant pipe line to the compressor discharge pipe after heat exchange with the refrigerant pipe. (2) The heat pump device according to claim 1, wherein the recirculation means is an ejector that uses compressor discharge gas as a driving flow. (3) The heat pump device according to claim 1, wherein a refrigerant liquid circulation pump is provided in the refrigerant branch pipe as the recirculation means.