JPS61225566A - Water-side heat exchanger - 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 Application of the Invention] The present invention relates to an air-resistant heat pump type chiller, and in particular to a water-side heat exchanger integrated with a liquid receiver suitable for supplementing the refrigerant that is insufficient at the start of box removal. Concerning vessels.

[Background of the invention]

In conventional equipment, the liquid receiver and water side heat exchanger were separate components, and the check valve and expansion valve were connected in parallel to each other.

However, at the start of unboxing, the refrigerant does not flow into the air side heat exchanger or liquid receiver temporarily, so if the pressure inside the liquid receiver decreases, the differential pressure at the outlet and outlet of the expansion valve decreases, causing Ig@
No consideration was given to the fact that a small amount of refrigerant passing through the valve would cause a shortage of refrigerant on the low-pressure side, resulting in a decrease in unboxing capacity.

[Purpose of the invention]

The object of the present invention is to integrate a container that serves as a liquid receiver with a water-side heat exchanger only during cell operation, and to use an oriice installed between the liquid receiver and the water-side heat exchanger to The object of the present invention is to make it easier to replenish the refrigerant that is in short supply from a liquid receiver, to prevent a temporary drop in suction pressure, to increase the removal efficiency, and to provide a stable removal cycle.

[Summary of the invention]

In order to store surplus refrigerant that is required only during heating operation, and to have a structure that easily supplies the refrigerant that is insufficient at the start of filtration to the low pressure side, an integrated structure with the water side heat exchanger is required. In order to eliminate the need for the refrigerant to pass through the expansion valve, it is sufficient to have holes for the refrigerant to flow through the integrated wall surface Vc2.

[Embodiments of the invention]

The present invention will be explained below with reference to an embodiment shown in FIG. 1(a), Φ).

A refrigerant connecting pipe 1 is connected to a refrigerant chamber 2, and the refrigerant chamber 2 and the refrigerant chamber 4 are communicated through a U-shaped heat tube 3. 5
is a refrigerant connecting pipe, one end of which is connected to the refrigerant chamber 4, the other end of which is connected to the refrigerant chamber 8 via a branch f6t through a check valve 7, and the other end is connected to the cooling expansion valve 15. . 9 is Oriais, the cold Is, the partition wall 8a between 44 and 8;
It is set in. Reference numeral 10 denotes a heat transfer tube, which communicates the refrigerant chamber 8 and the liquid receiving chamber 11. 12 is a check valve, and the liquid receiving chamber 11
and the artificial side of the cooling expansion valve 15 is connected to the pipe 12a.

13a are connected via a branch pipe 13 and a check valve 14. 50 is a water inlet, and 51 is a water outlet.

52 is a jamaita. 53 is a liquid refrigerant pipe connected to an air side heat exchanger (not shown). 31 is a side shell, and 32.35 is a side plate.

During heating operation, the high-temperature, high-pressure refrigerant from the compressor flows into the refrigerant chamber 2 through the refrigerant connection pipe 1, and from there, it exchanges heat with water in the U-shaped heat transfer section 3 and is gradually liquefied into the cold TS chamber 4. Then, all of the refrigerant flows in as liquid refrigerant. Most of the refrigerant is in the refrigerant connection pipe 5
, branch pipe 6 , and check valve 7 to flow into the refrigerant chamber 8 . A portion also flows from the refrigerant chamber 4 into the refrigerant chamber 8 through the orifice 9 . The refrigerant in the refrigerant chamber 8 passes through the heat transfer tube 10 and flows into the liquid receiving chamber 11, and from there passes through the check valve 12 and passes through the branch pipe 13 to the y-chamber expansion valve. During cooling operation, liquid cooling T condenses in the air side heat exchanger! The refrigerant flowing to the branch pipe 13 does not flow to the liquid receiving chamber 11 because it is blocked by the upper part 9P12. There, the pressure is reduced through the check valve 11 and the cooling expansion valve 15, and the refrigerant flows into the branch pipe 6, the refrigerant connection pipe 5, and the refrigerant chamber 4. Since the pressure of the liquid receiver 11 is equalized to a low level through the orifice 9, liquid refrigerant does not accumulate. The refrigerant in the refrigerant chamber 4 passes through the U-shaped heat pipe 3 to the refrigerant chamber 2 and the refrigerant connection port 1, where it undergoes heat exchange in the heat transfer section I#3, gasifies, and returns to the compressor. Therefore, the liquid receiving chamber 11 serves to store liquid refrigerant during heating operation. Immediately after switching to the removal operation, the refrigerant accumulated in the refrigerant chamber 4, the U-shaped heat tube 3, and the refrigerant chamber 2 immediately returns to the compressor VC. After that, the pressure in the refrigerant chamber 4 decreases, so that a pressure difference is generated between the refrigerant chamber 8 and the refrigerant chamber 8. Due to this differential pressure, the liquid refrigerant located between the refrigerant chamber 8, heat transfer tube 10, liquid receiving chamber 11, and check valve 12 is depressurized at the orifice 9 and flows out into the refrigerant chamber 4, where it flows into the U-shaped heat tube 3, refrigerant chamber 2, The refrigerant returns to the compressor through the refrigerant connection port 1, preventing a drop in suction pressure, and is discharged from the compressor to the air-side heat exchanger, increasing the removal capacity. Perfect heat exchange! As the high-voltage refrigerant flows into the FC unit, the pressure there rises and gradually flows out to the branch pipe 13 and the cooling expansion valve 15. Since the pressure is reduced by the expansion valve 15 and the refrigerant flows into the refrigerant chamber 4, the low-pressure side is always replenished with refrigerant. Accordingly, this embodiment has the effect of continuously performing the mulch removal operation without causing a pressure drop on the low-pressure side at the start of deregistration. There is. In the conventional technology, the water side heat exchanger has a cold TS connection port 1, a refrigerant chamber 2, a U-shaped heat pipe 3, a refrigerant chamber 4, as shown in FIG.
It consists only of the refrigerant connection port 5 and is a separate component from the receiver g and the receiver 11, so the structure is such that the cooling expansion valve 15 and the check valve 7 are connected in parallel with piping. The liquid refrigerant only passes through the cooling expansion valve 1st, and as the liquid refrigerant in the liquid receiver 110 decreases, the differential pressure across the expansion valve decreases, and the amount passing through the expansion valve 15f decreases. However, according to the embodiment of the present invention, the liquid refrigerant easily flows out from the orifice 9, so this does not cause a drop in the suction pressure. do not have.

〔Effect of the invention〕

According to this invention, all the refrigerant flows into the liquid receiver during heating operation, and only a small amount of low-pressure gas refrigerant accumulates during cooling operation. Since the still pressurized liquid refrigerant does not come from the side heat exchanger in front of the expansion valve, the amount of refrigerant passing through the expansion valve decreases, but the pressurized liquid refrigerant, which was sealed in the liquid receiver with the check valve, easily passes through the oriswiss. Therefore, by increasing the refrigerant supply j1r to the low pressure side, preventing a drop in temporary working suction pressure, and supplying a large amount of refrigerant to the air side heat exchanger through the compression chamber, the removal efficiency is increased (removal operation This has the effect of shortening the time and increasing heating efficiency including defrosting heat loss during heating operation.

[Brief explanation of drawings]

Fig. 1 is a parts cycle system diagram for explaining the refrigerant flow and function of the refrigeration cycle of the present invention, and Fig. 2 is a parts cycle system diagram for explaining the refrigerant flow and function of the conventional refrigeration cycle. 1... Refrigerant connection port 2.
...Refrigerant chamber 3...U-shaped heat tube 4...Refrigerant chamber 5...Refrigerant connection port 6...Branch pipe 7...
・Check valve 8... Refrigerant chamber 9... Orifice
10... Heat transfer tube 11... Liquid receiving chamber 12... Check valve 13... Branch pipe 14... Check valve 15.
...Air conditioning expansion valve 20...Tube plate 21...Side shell 22.23...Partition plate 24...
Orifice 25.26... Refrigerant connection port 27.
・・U-shaped heat 'f 28...Heat transfer tube 29...
・Tube plate 30...liquid receiving chamber 31...side shell
32...Side plate 33.34...Refrigerant connection port
35... Side plate 36... Upper refrigerant chamber 37... Middle refrigerant chamber 38... Lower refrigerant chamber. Pole 1m Z-bacteria (Kyu)

Claims (1)

[Claims] The tube plate on the side where the U-shaped heat transfer tubes are fixed partitions the water side and the refrigerant side, and the outer periphery of the tube plate on the refrigerant flow path side is surrounded by a side shell.This is a shell-and-tube type water-side heat exchange heat exchanger. The inside of this side shell is divided into three parts by a partition plate, and the partitioned upper chamber connects the refrigerant inlet connection pipe and one end of the U-shaped heat exchanger tube, and the middle chamber connects the other end of the U-shaped heat exchanger tube and the refrigerant outlet. Connecting piping is connected, and the connecting piping for the refrigerant outlet from the middle chamber is divided by a branch pipe, one side is connected to the lower chamber via a check valve, and the other side is connected to the expansion valve, so that the middle chamber and the lower chamber are connected to each other. An auxiliary pressure reducing device (orifice) during defrosting operation is installed on the partition plate that partitions the chamber, and a vascular heat transfer tube is fixed to the tube plate of the lower chamber, and the tube end is fixed to another tube plate that partitions the water side. The refrigerant side of the other tube plate is provided with a liquid receiving container chamber surrounded by a side shell and a side plate for storing liquid during heating, and the liquid receiving container chamber has a refrigerant liquid outlet for connecting a check valve. Characteristic water side heat exchanger.