JP2014238207A - Expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve noise reduction of an expansion valve which decreases the pressure of refrigerant in a refrigeration cycle and controls the flow rate of the refrigerant.SOLUTION: A valve body 10 of an expansion valve includes an inlet port into which refrigerant in high pressure is delivered, and an outlet port. In a valve chamber, a valve body is provided for controlling the opening in a valve seat. In the outlet port, a flow adjusting plate 100 is fixed which has small holes 120 in an upper half thereof and a half-arc shaped opening 110 in a lower half, and adjusts flow of refrigerant outflowing to an evaporator side to reduce noise caused by burst of bubbles.

Description

  The present invention relates to a temperature-sensitive expansion valve used in a refrigeration cycle.

Conventionally, for a refrigeration cycle used in an air conditioner or the like mounted on an automobile, a temperature-sensitive temperature expansion valve that adjusts the amount of refrigerant passing according to the temperature is used to omit installation space and piping. .
This type of expansion valve is disclosed in Patent Document 1 below.

JP 2012-47393 A

In this type of expansion valve, the refrigerant passing through the orifice and going from the outlet port to the evaporator contains bubbles generated during expansion.
Patent Document 1 discloses a technique for preventing noise caused by bursting of bubbles by providing a throttle member at the outlet port to rectify the refrigerant.
The object of the present invention is to further improve this type of expansion valve.

  In order to achieve the above object, an expansion valve of the present invention includes an inlet port for introducing a high-pressure refrigerant condensed by a condenser, a valve chamber communicating with the inlet port, an orifice provided in the valve chamber, and an expansion in the orifice. An outlet port for leading the refrigerant to the outside and a valve body having a passage through which the refrigerant returning from the evaporator to the compressor passes, a valve body for opening and closing the orifice, and driving the valve body to increase the opening of the orifice A valve body drive device for controlling, and the outlet port is provided with a rectifying plate, and the rectifying plate has a semicircular opening facing the lower half of the outlet port, and a plurality of facing the upper half. A small hole is provided.

  The gas refrigerant contained in the refrigerant passing through the orifice temporarily stays in front of the rectifying plate, and the gas refrigerant is divided into small bubbles and flows through the small holes.

  Since the expansion valve of the present invention has the above-described configuration, the bubbles in the refrigerant from the outlet port toward the evaporator are subdivided, and noise due to the bursting of the bubbles is reduced.

It is a longitudinal cross-sectional view of the expansion valve which concerns on suitable one Embodiment of this invention. It is a left view of an expansion valve same as the above.

  As shown in FIGS. 1 and 2, the expansion valve 1 of the present invention has a valve body 10, and the valve body 10 is provided with an inlet port 20 into which a high-pressure refrigerant supplied from the compressor side is introduced. The port 20 communicates with the valve chamber 22 through the small diameter portion 21. A valve seat 24 that is opened and closed by a valve body 60 is formed in the inlet port 20, and the refrigerant whose flow rate is controlled by the valve seat 24 and the valve body 60 passes through the orifice 26, and has a small-diameter outlet port 27 and a large-diameter outlet port. 28 is sent to the evaporator side.

The refrigerant returning from the evaporator to the compressor side passes through a return passage 30 provided in the valve body 10. The refrigerant passing through the return passage 30 is introduced to the valve body driving device 40 side through the opening 32 and transmits temperature information of the refrigerant to the valve body driving device 40 side.
The valve body driving device 40 has a working pressure chamber 44 that is defined by a diaphragm 42 and enclosed with a working fluid in a casing 41, and the pressure fluctuation is converted into a displacement of the diaphragm 42, and is received via a receiving member 46. It is transmitted to the operating rod 50.

  The operating rod 50 operates the valve body 60 to control the valve opening. The spherical valve body 60 is supported by a spring receiver 70. The spring receiver 70 is supported by an urging spring 80 provided between the plug 90 that seals the valve chamber 22. The plug 90 is a nut-like member, and the urging force of the valve body 60 in the valve closing direction can be adjusted by adjusting the screwing amount.

A rectifying plate 100 is attached to the outlet port 28.
The rectifying plate 100 is a disk-shaped member inserted into the outlet port 28, and a semicircular opening 110 is provided in the lower half.

  Of the refrigerant that has passed through the orifice 26, the liquid refrigerant having a large specific gravity that does not include bubbles flows below the small-diameter outlet port 27, flows out from the opening 110 to the large-diameter outlet port 28, and is directed to the evaporator. Sent out.

  The gas refrigerant including bubbles and having a small specific gravity flows on the upper side of the small-diameter outlet port 27, hits the upper side of the rectifying plate 100, and stays there. The bubbles are subdivided into small bubbles by a large number of small holes 120 and flow out to the large-diameter outlet port 28 side.

  By this action, the bubbles in the gas refrigerant are subdivided into small bubbles, rectified, and sent out to the evaporator. The noise resulting from the disturbance of the flow of the gas refrigerant is reduced by the bubble fragmentation and the rectifying action.

  As described above, the expansion valve 1 of the present invention is provided with the rectifying plate having a semicircular arc opening in the lower half of the outlet port and a large number of small holes in the upper half, so that the bubbles in the gas refrigerant are subdivided. Since it is rectified, noise is reduced.

DESCRIPTION OF SYMBOLS 1 Expansion valve 10 Valve main body 20 Inlet port 21 Small diameter part 22 Valve chamber 24 Valve seat 26 Orifice 27 Outlet port (small diameter part)
28 Outlet port (large diameter part)
30 Return passage 32 Opening 40 Valve body drive device 41 Casing 42 Diaphragm 44 Operating pressure chamber 46 Receiving member 50 Operating rod 60 Valve body 70 Spring receiver 80 Energizing spring 82 Spring internal space 90 Plug 100 Current plate 110 Opening 120 Small hole

Claims (2)

An inlet port for introducing a high-pressure refrigerant condensed by a condenser, a valve chamber communicating with the inlet port, an orifice provided in the valve chamber, an outlet port for leading the refrigerant expanded in the orifice to the outside, and an evaporator from the evaporator An expansion valve comprising a valve body having a passage through which the refrigerant returns to, a valve body that opens and closes the orifice, and a valve body drive device that drives the valve body to control the opening of the orifice,
The outlet port is equipped with a baffle plate,
The rectifying plate includes a semicircular arc opening facing the lower half of the outlet port, and a large number of small holes facing the upper half.   The gas refrigerant contained in the refrigerant passing through the orifice temporarily stays in front of the rectifying plate, and the gas refrigerant is divided into small bubbles and flows through the small holes. Expansion valve.