JPH034082A - Solenoid valve - Google Patents

Abstract

PURPOSE:To prevent a scratch noise generated, when a valve is opened with a large differential pressure, by allowing fluid in a valve chamber to flow in an outlet flow line via a pressure equalizer flow line and an auxiliary flow line through opening of a subvalve, decreasing a differential pressure between the inside of the valve chamber and the outlet flow line and opening a main valve with urging force of a spring. CONSTITUTION:A main valve seat 14 is formed in the end face of an outlet flow line 9 in a valve chamber 1, and by slidably inserting and fitting a main valve unit 15 in a plunger 2, a back space 1a between these plunger and main valve unit, auxiliary flow line for penetrating through the main valve unit 15 and a subvalve seat 17 in the back surface end face of the flow line 16 are formed. While a main valve opening spring 18 is adapted to a main valve to decrease resilient force of this spring 18 smaller than a plunger resetting spring 19 provided between the plunger 2 and a suction piece 6, and a pressure equalizing flow line 20, in which the valve chamber 1 communicates with the back surface space 1a, is provided in the main valve unit 15. Accordingly, when the main valve unit 15 generates a large differential pressure, a fluid scratch noise, when the valve is opened, can be prevented.

Description

[Detailed Description of the Invention] [Prior Art] Fig. 2 is a refrigeration circuit diagram of a multi-type heat pump air conditioner, in which a plurality of indoor units (B) are connected to one outdoor unit (A). ing. C is a compressor, (D) is a four-way valve that switches the flow of refrigerant by heating and cooling, (E) is a solenoid valve shown in FIG. 3, and (F) is an electric expansion valve.

FIG. 3 is a sectional view showing the solenoid valve (E) incorporated in the refrigeration circuit.
A langeer (2) is provided. At the bottom of the plunger (2) is a disc-shaped valve body (3) that is in contact with the Benkei (4).
is installed. 1. An attractor (6) is provided above the langeer (2) via a spring (5). An electromagnetic coil <7) is wound around the outer periphery of the plunger (2) and the attractor (6). Further, the valve chamber (1) communicates with an inlet channel (8) into which the refrigerant enters and an outlet channel (9) from which the refrigerant exits.

In the case of the above multi-type heat pump air conditioner, if there is an indoor unit (B) that is not used for heating, close the solenoid valve (E) on the inlet side of that indoor unit (B), and close the expansion valve (F). It is common to open the indoor unit (B) to prevent refrigerant from remaining inside the indoor unit (B). When heating the indoor unit (B), the electromagnetic coil (7)
By energizing and causing the attractor (6) to attract the plunger (2), the valve body (3) separates from the valve seat (4) and the refrigerant flows into the indoor unit (B).

[Problem to be solved by the invention Ml Since conventional solenoid valves suddenly operate between fully closed and fully open, it is difficult to open the solenoid valve (E) when a large fluid pressure differential is applied to both sides of the solenoid valve (E). There is a problem in that a large amount of refrigerant suddenly flows into the indoor unit (B) and a harsh refrigerant scraping sound is generated.

The present invention was made to solve this problem, and an object of the present invention is to obtain a solenoid valve that can prevent the generation of noise due to a large pressure difference.

[Means for Solving the Problems] The solenoid valve according to the present invention includes a main valve body that is provided in the valve chamber and blocks fluid flowing from the inlet flow path toward the outlet flow path, and the main valve body. a sub-valve body provided on the axis and moving toward and away from the main valve body; an auxiliary flow path formed in the main valve body; a pressure equalizing flow path that communicates the valve chamber and the outlet flow path in cooperation with the auxiliary flow path when separated, and one of which contacts the main valve body and urges the main valve body in a direction to open the valve. a main valve opening spring; and a sub valve, one of which abuts the sub valve element and biases the sub valve element in a direction to close the valve, and has a biasing force greater than the biasing force of the main valve opening spring. It is equipped with a spring for returning the valve body.

[Function] In this invention, when the sub-valve element opens, the fluid in the valve chamber flows to the outlet channel through the pressure equalizing channel and the auxiliary channel,
After that, the pressure difference between the valve chamber and the outlet passage becomes small, and the main valve body is opened by the biasing force of the main valve opening spring, which is greater than the pressure difference, and the fluid passes through the inlet passage and the valve chamber and exits. Flows into the channel.

[Example〕 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The same or corresponding parts as those in the figures are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, an inlet flow path (8) and an outlet flow path (9) face the valve chamber (1) inside the valve body (10), and the end face of the outlet flow path (9) faces the main valve. A seat (14) is formed. A piston-shaped main valve body (15) is slidably inserted into the plunger (2), which is a sub-valve body.

The plunger (2) side of the main valve body (15) has a back space (1
a) is formed. An auxiliary passage (16) passes through the main valve body (15) along its axial direction, and an auxiliary valve seat (17) is formed on the rear end surface of the auxiliary passage (16). . - The main valve opening spring (18) whose end abuts the main valve body (15) is the plunger return spring (19) compressed between the plunger (2) and the suction element (6).
It is set to a smaller rebound force. Main valve body (15)
A plurality of pressure equalizing channels (20) are provided that communicate the valve chamber (1) and the back space (1a). This pressure equalization channel (
The flow resistance of 20) is equal to or smaller than the flow resistance of the auxiliary flow path (16).

Next, the operation of the solenoid valve having the above configuration will be explained. When the electromagnetic coil (7) is not energized, 1 runge (2)
The main valve body (15)
is pressed, and both the main valve seat (14) and the sub valve seat (17) are closed. In addition, the inside of the valve chamber (1) is filled with refrigerant at a high pressure on the inlet side (P, ), and the outlet flow path (9) is at a lower pressure on the outlet side (P2). , the main valve body (15) is caused by the pressure difference of the refrigerant to cause the main valve seat (
14).

In the state shown in Fig. 1 in which both the main valve body (15) and the plunger (2), which is the sub-valve body, close the outlet flow path (9) and the auxiliary flow path (16), the electromagnetic coil (7) is energized. Then, the plunger (2) is attracted by the suction element (6), and the first plunger (2) becomes the sub-valve! (17) It can be done from. By the operation of this first stage valve, the refrigerant flows through the valve chamber (1) and the pressure equalization channel (2).
0), it flows little by little from the back space (1a), through the auxiliary valve seat (1)), through the auxiliary flow path (16), and into the outlet flow path (9), but the pressure inside the valve chamber (1) is high. The side pressure (P, ) is maintained, and the main valve body (15) does not move. However, as time passes and the pressure difference between the outlet side pressure (P, ) and the inlet side pressure (P, ) disappears, the main valve body (15) Place the valve body (15) on the main valve seat (
14) is weakened, and the main valve opening spring (
! 8), the main valve body (15) is separated from the main valve seat (14), and the valve is eventually fully opened due to the two-film action, and the refrigerant flows from the inlet flow path (8) through the valve chamber (1) to the outlet flow path ( 9).

As mentioned above, the solenoid valve operates by double membrane operation, so when the indoor unit (B) is not used during heating, there is a large pressure difference on both sides of the solenoid valve (E), but the indoor unit ( Since the solenoid valve (E) does not suddenly open when heating starts in B), it is possible to prevent the generation of refrigerant friction noise.

In addition, although the above-mentioned example explained the case where a refrigerant was used as the fluid, it is of course not limited to this.
Moreover, although this electromagnetic valve has been described in the case where it is applied to a multi-type heat pump air conditioner, it goes without saying that it can also be applied to other devices that require fluid control.

Furthermore, instead of forming the pressure equalizing passage (20) in the main valve body (15), the pressure equalizing passage (20) may be formed in the plunger (2).

[Effects of the Invention] As explained above, in the electromagnetic valve of the present invention, when the sub-valve element opens, the fluid in the valve chamber flows to the outlet channel through the pressure equalization channel and the auxiliary channel, and then flows into the valve chamber. As the pressure difference between If there is a large fluid pressure difference between the inlet flow path side and the outlet flow path side, this has the effect of preventing the generation of fluid friction noise that occurs when the main valve body is opened.

[Brief Description of the Drawings] Figure 1 is a sectional view showing an embodiment of the present invention, Figure 2 is a refrigeration circuit diagram of a multi-type heat pump air conditioner, and Figure 3 is an example of a conventional solenoid valve. FIG. In the figure, (1) is the valve chamber, (2) is the 1-lunger (sub-valve body), <8) is the inlet flow path, (9) is the outlet flow path, and (15) is the inlet flow path.
) is the main valve body, (16) is the auxiliary flow path, (18) is the main valve opening spring, (19) is the plunger return spring (auxiliary valve body return spring), and (20) is the pressure equalization flow path. be. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1111

Claims (1)

[Scope of Claims] A main valve body provided in a valve chamber to block fluid flowing from an inlet flow path toward an outlet flow path, and a main valve body provided on the axis of the main valve body to move toward and away from the main valve body an auxiliary valve body; an auxiliary passage formed in the main valve body; and a auxiliary passage provided around the auxiliary passage, which cooperates with the auxiliary passage when the auxiliary valve body is separated from the main valve body. a pressure equalizing flow path that communicates the valve chamber and the outlet flow path; a main valve opening spring, one of which is in contact with the main valve body and biased in a direction to open the main valve body; a auxiliary valve element return spring, one of which abuts on the valve element, biases the auxiliary valve element in a direction to close the valve, and has a biasing force greater than the biasing force of the main valve opening spring; When the auxiliary valve body opens, the fluid in the valve chamber flows through the pressure equalizing channel and the auxiliary channel to the outlet channel,
Thereafter, a pressure difference between the valve chamber and the outlet passage becomes small, and the main valve body is opened by a biasing force of the main valve opening spring that is greater than the pressure difference.