JPH08312821A - Sealed type flow rate regulating valve - Google Patents

Abstract

PURPOSE: To form a valve body in a small size, reduce the power consumption thereof, and reduce a cost. CONSTITUTION: The rotary shaft 21 of a pulse motor 20 is connected to a flow rate regulating body 10 through a magnetic joint 30 made of a pair of permanent magnets 31, 32, and a sealed valve case 40 in which the flow rate regulating body 10 is sealed is interposed between two permanent magnets 31 and 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used as an air conditioner, an expansion valve for a refrigerator, etc., and can obtain an arbitrary flow rate depending on the number of pulses given to a pulse motor, and is small in size and consumes little. The present invention relates to a sealed flow rate control valve with low power consumption.

[0002]

2. Description of the Related Art Air conditioners that have been used in recent years are capable of drastically varying their capacities due to the use of inverters. With this, the throttling mechanism is the most important element for maintaining an appropriate refrigeration cycle under various conditions. Has become.
If this is attempted to be realized with a conventional capillary tube or a thermal expansion valve, the refrigerant circuit will inevitably become complicated.Therefore, systematization with a microcomputer will control the refrigerant to operate the air conditioner in the optimum state. For that purpose, a flow rate control valve called an electronically controlled expansion valve in a system conceptual diagram as shown in FIG. 3 has been developed.

That is, in this flow rate adjusting valve, when the pulse voltage of the operation signal S is applied to the electronically controlled expansion valve 1 by the microcomputer 2 so that the air conditioner can perform optimum control according to the load, the shaft 3 is driven by M. The needle 5 is directly driven by the drive unit shown to change the opening of the needle 5 with respect to the fluid passage section. However, the drive section M of the conventional electronically controlled expansion valve is a motor in which the rotor 6 which is a rotor and the stator 7 which is a stator are separated by a thin tube can tube 8. Operates in the same manner as a pulse motor together with the stator 7, and therefore the gap between the outer diameter of the rotor 6 and the inner diameter of the stator 7 is required to be as small as possible.

On the other hand, in the conventional electronically controlled expansion valve 1, the can tube 8 is provided between the roller 6 and the stator 7.
That is, since the sealing valve case is interposed, the gap between the outer diameter of the rotor 6 and the inner diameter of the stator 7 must be increased, and therefore the rotor 6 and the stator 7 are increased in size in order to obtain the required rotational force of the rotor 6. In addition, the valve body becomes expensive and the power consumption of the stator 7 increases.

Further, as described above, in the conventional example, the rotor 6 is used.
Since the sealing valve case, which is the can tube 8, is interposed between the stator 7 and the stator 7, the rotor 6 does not come into contact with the inner diameter of the sealing valve case, and it is necessary to keep the gap small. It is necessary to manufacture the rotor 6 with a small dimensional tolerance and a small amount of eccentricity with respect to the central axis, and to manufacture it with high accuracy.
It is necessary to manufacture it with a material that considers the durability against the fluid temperature used in the temperature range of 0 ° C to 120 ° C.
On the other hand, since the rotor 6 operates in the same manner as the pulse motor together with the stator 7, it is necessary to be a permanent magnet accurately magnetized with multiple poles, which is problematic in that it is expensive.

Further, the electronically controlled expansion valve 1 has a low temperature during a normal refrigeration cycle operation, and is often used in a state in which frost is formed on the surface thereof.
In order to protect the internal coil from moisture, it is necessary to seal it with resin, which is expensive.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and can form a valve body in a smaller size, consumes less power, and is an inexpensive sealed type. The purpose is to provide a flow control valve.

[0008]

In order to achieve the above object, in the sealed flow rate control valve of the present invention, the rotary shaft of the pulse motor and the flow rate control body are connected via a magnetic coupling made of a permanent magnet. In addition, a sealing valve case that seals the flow rate adjusting body is interposed between the permanent magnets.

In the hermetically sealed flow rate adjusting valve having the above structure, an arbitrary flow rate can be obtained by the number of pulses given to the pulse motor, which is inexpensive and small in size and consumes less power. As a flow rate control valve, a needle in which one end is vertically movable to a permanent magnet installed in the sealed valve case and the other end is variably arranged in the fluid passage cross-sectional area with respect to the needle receiver of the sealed valve case. , A support member for a hermetically sealed valve case having a female screw that allows the needle to move up and down while meshing with a male screw provided on the needle.

In the flow rate adjusting valve having the above structure, the rotation of the rotary shaft of the pulse motor is transmitted to the needle through the permanent magnet, and the rotation of the needle causes the male thread on the needle side to mesh with the female thread of the support member. Only the needle moves in the vertical direction, and the needle can change the fluid passage cross-sectional area with respect to the needle receiver to arbitrarily adjust the flow rate.

The flow rate adjusting valve can be effectively applied as an expansion valve of an air conditioner or a refrigerator.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a hermetically sealed flow rate adjusting valve according to the embodiment, and FIG. 2 is an enlarged perspective view of a needle of FIG. It is a figure.
First, as shown in FIG. 1, the rotary shaft 2 of the pulse motor 20.
1 and the flow rate adjusting body shown by 10 in the figure are joined together via a magnetic joint 30 composed of a pair of permanent magnets 31, 32, and the flow rate adjusting body is provided between these two permanent magnets 31, 32. A sealing valve case 40 that seals 10 is interposed, and an arbitrary fluid is obtained by the flow rate adjusting body 10 depending on the number of pulses given by the pulse motor 20.

Therefore, in this embodiment, the flow rate adjusting body 10 sealed in the sealing valve case 40 is constructed as follows. That is, the cross-shaped hole 3 provided in the center of the lower surface of the one permanent magnet 32 provided in the sealing valve case 40.
3, a cross-shaped upper end portion 13 formed as shown in FIG. 2 is joined to one end of the needle 12 so as to be vertically movable, and the other end of the needle 12, that is, a lower end portion 14 is joined.
The fluid passage cross-sectional area is variably arranged with respect to the needle receiver 41 of the sealing valve case 40.

In addition, a support member 42 having a female screw 16 that allows the needle 12 to move up and down while meshing with a male screw 15 provided on the body of the needle 12 is provided in the sealed valve case 40. In addition, in FIG. 1, the pulse motor 20 is covered with a motor support cover 22, and the fluid passing through the inside of the sealing valve case 40 is made of copper pipe channels 50, 51.
Through the lower end 14 of the needle 12 and the needle receiver 41.
With, the fluid passage area is made variable.

That is, in the flow rate adjusting body 10 described above, the permanent magnet 31 is rotated by the pulse motor 20 and the other permanent magnet 32 is rotated in synchronization with the permanent magnet 31, whereby the rotational force is transmitted to the needle 12, Male screw 15 provided on needle 12 and female screw 1 provided on support member 42
6, the needle 12 moves in the vertical direction, but at that time, the permanent magnet 32 does not move up and down, and adjustment is performed to obtain an arbitrary flow rate by the number of pulses given by the pulse motor 20. Is supposed to be.

As described above, by using the general-purpose pulse motor 20, the desired characteristics can be freely selected, and a small-sized flow control valve with low power consumption can be provided.
On the other hand, the flow paths 50, 5 to which this kind of flow rate adjuster 10 is applied
1 is separated from the external space by the sealing valve case 40 as shown in FIG. 1, so power transmission for operating the flow rate adjusting body 10 is required from the external space to the inside, and the conventional example shown in FIG. Although the magnetic force is used as the power transmission means like the rotor 6 and the stator 7, in the conventional example, the rotational energy is generated from the electric energy simultaneously with the power transmission through the can tube 8 of the sealed valve case. In the present invention, the rotational energy is generated from the electric energy in the pulse motor 20 portion, and only the power transmission is performed with the sealing valve case 40 interposed. Therefore, the permanent magnets 31 and 32 have a simple shape and simple attachment. Since it can be magnetized, the accuracy can be made relatively low, and an inexpensive flow rate adjusting valve can be provided. The sealed flow control valve of the present invention can be effectively used as an air conditioner and an expansion valve for a refrigerator.

[0017]

As described above, the sealed flow rate adjusting valve of the present invention can use a general-purpose pulse motor to provide a small size, low power consumption, and inexpensive flow rate adjusting valve. Further, since the fluid flow path is isolated from the external space by the sealed valve case and the flow rate adjuster can be operated from the outside of the flow path by the pulse motor, the sealed flow rate adjustment valve of the present invention can be used in applications where fluid leakage is disliked and , Applications requiring isolation from the motor,
Especially for hydraulic and air flow control valves for clean mur,
It can be effectively applied to a pressure reducing valve and further to a food flow rate adjusting valve.

[Brief description of drawings]

FIG. 1 is a side sectional view of a hermetically sealed flow rate adjusting valve according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the needle of FIG.

FIG. 3 is a system conceptual diagram of a conventional flow rate adjusting valve.

[Explanation of symbols]

10 Flow rate adjuster 12 Needle 15 Male screw 16 Female screw 20 Pulse motor 21 Rotating shaft 30 Magnetic coupling 31 Permanent magnet 32 Permanent magnet 40 Sealing valve case 41 Needle receiver 42 Support member

Claims (3)

[Claims] 1. A rotary valve of a pulse motor and a flow rate adjusting body are joined together via a magnetic coupling made of a permanent magnet, and a sealing valve case in which the flow rate adjusting body is sealed is interposed between the permanent magnets. Sealed flow control valve. 2. A flow control valve has one end vertically movable to a permanent magnet provided in a sealed valve case, and has a variable fluid passage cross-section at the other end with respect to a needle receiver of the sealed valve case. 2. The sealed flow rate adjusting valve according to claim 1, comprising a needle arranged and a support member in a sealing valve case having a female screw that allows the needle to move up and down while meshing with a male screw provided on the needle. 3. The sealed flow rate adjusting valve according to claim 1, which is used as an expansion valve for an air conditioner or a refrigerator.