JPS58133581A - Controller for flow rate - 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 flow control device, and particularly to a flow control device for controlling refrigerant flow in a refrigeration cycle.

Figure 1 is a diagram showing an example of the refrigeration cycle of a conventional refrigeration system, and Figure 2 is a structural diagram of a pressure distribution device. condenser, (3) is a capillary tube;
(4) is evaporation! (5) is the flow area adjustment valve, (6) is the valve lift adjustment device-1, and (7) is the heat exchange section. In Figure 2, (8) is a pipe, and (9) is a bald heat material.

In such conventional refrigeration systems, refrigerant gas that has become high temperature and high pressure in the compression width (1) is cooled and liquefied in the condenser (2), becomes low temperature and low pressure in the capillary tube (3), and is then transferred to the evaporator. (4
). In the evaporator (4), the refrigerant liquid is not only gasified but also collected from the surroundings and frozen.

After this, the refrigerant gas is sucked into the pressure chamber th (1).

It is known that in such a refrigeration system, the certified refrigerant flow rate varies depending on the evaporation temperature, and normally, as the evaporation temperature increases, a larger refrigerant flow rate is required. Therefore, for example, measure the mM at the entrance and exit of the evaporator (4).
) The cooling of the capillary tube (3) is adjusted so that the temperature at the outlet of the evaporator (4) is slightly higher than the temperature at the inlet. As a result, a proper refrigerant flow rate is maintained.

As shown in Figure 8, this cooling relationship increases as the cooling capacity increases. This is a capillary (3
This is because the amount of refrigerant generated in the two-phase refrigerant, which contains scum in the refrigerant, decreases as the number of cooling regions increases, so the refrigerant flow rate increases as the resistance of the btt body increases.

Utilizing this characteristic, in a conventional device, for example, the temperature at both the entrance and exit of the evaporator (4) is controlled by valve lift control.
eim 161 controls the valve lift of the flow regulating valve (5) to regulate the flow rate of refrigerant from the condenser (2), and the refrigerant reaches a low temperature and flows through the capillary tube (3) in the heat exchanger section (9). ) to cool the refrigerant inside. By increasing or decreasing the amount of cooling, the flow rate of cold through the capillary was controlled.

Conventional refrigeration systems are constructed as described above, or because the capillary tube (3) is coiled in contact with the pipe (8), the contact between the capillary width (3) and the pipe (8) is troublesome. However, there were disadvantages in that sufficient contact could not be ensured and sufficient performance could not be obtained due to insufficient contact.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and one embodiment of the invention will be described below. That is, as shown in FIG. 4, a straight capillary tube (3) of a predetermined length is inserted into a straight pipe (8) to form a double tube (C). 6 times in the middle of the coil, capillary width (3) and pipe (8)
There is a flow path for the cooling medium... and a capillary tube (3).
A temporary cooling medium flow path is formed inside. The pipe (8) has a cooling medium inlet (80a).
) is connected to the pipe fitting υ, capillary tube (3)
The inlet (8a) of the pipe passes through the distribution joint-〇 pipe support part (sob) and is led out to the outside, and this capillary! The inlet (8a) of r (3) is connected to the condenser (2), and the cooling amount,
The inlet (80a) of the body is connected to the flow-up seal and the burial valve (5). On the other hand, a pipe joint Wll is connected to the other end of the pipe (8), and the outlet (81m) of this pipe joint is connected to the evaporator (4). In addition, an outlet (8b) of the hair shaft (3) is opened in this distribution joint βυ, where the cooling medium from each distribution b GlJ @ and the medium to be cooled join, It flows into the evaporator (4).

These actions are similar to those of conventional devices, but in this invention, the refrigerant flowing in the capillary tube (3) and the pipe (8)
The refrigerant flowing in the circle can exchange heat over the entire surface of the capillary tube (3), and the inner diameter of the cooling medium flow path (e) is relatively small. Therefore, the refrigerant flow rate is increased (usually, the inner diameter of the capillary tube (3) is doubled by the outer diameter of the capillary tube (3)), and heat transfer is promoted, thereby ensuring extremely good performance.

In the above example, a simple refrigeration system was shown, but this decompression device may also be used in a heat pump system. I! M
+[(By accepting it, you can also widen the range of control.

As described above, according to the present invention, a capillary tube is forced through a tube (c) through which cold U cooled by another flow control valve is passed through to form a double tube. Since the capillary is wound into a coil, the entire surface of the capillary tube becomes a heat transfer area υ, and because the coolant flow path is relatively narrow, the flow rate is fast υ, which promotes heat transfer. It is easy to manufacture and inexpensive, and has the effect of suppressing sufficient performance in the flow control process.

[Brief explanation of the drawing]

Figure 1 is a cycle diagram of a conventional refrigeration system, Figure 2 is a structural diagram of a conventional pressure reducing system, Figure 8 is a diagram showing the relationship between the degree of subcooling and refrigerant flow at the inlet of the pressure reducing system, and Figure 4 is a diagram of this system. 1 shows a structural diagram of a pressure reducing device showing an embodiment of the invention. In the figure, (1)... pressure phase machine, (2)... IR pongee, (
3)... In the inguinal pressure system (4)... Evaporator, (5)...
・Flow'M adjustment valve, (6)... Valve lift adjustment device, (7
)...Heat exchange section, (8)...Pipe, (9)...
Insulating material, cooling medium flow path, (c)...cooled rod flow path, (3)...double pipe. The same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Fig. 1 Fig. 2 Fig. 3 Clear quantity -

Claims (1)

[Claims] A cooling medium flow path through which a cooling medium flows, a capillary 1 through which a medium to be cooled to be cooled by the cooling medium passes, and means for adjusting the swimming spear of the cooling medium are provided, In the device in which the flow area of the medium to be cooled is controlled by adjusting the cooling, the capillary tube is inserted into the pipe forming the cooling medium flow path to form a double pipe. Flow rate control device made by winding a tube into a coil shape