JP2002276827A - Control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control valve capable of enhancing an accuracy of a flow rate control at respective valve openings by enlarging a rotation area (control area) of a valve element to two fold by disposing the valve openings on circumferences of radii different from a center of a valve seat. SOLUTION: In the control valve, the valve element is engaged with a rotor by a driving means such as a stepping motor, etc., to rotate the valve element and an opening/closing of a plurality of valve openings communicated with respective outlet passages is adjusted to control a flow passage or a flow rate by rotating/sliding the valve element on a valve seat surface of the valve body or a single valve seat surface within a range of less than one rotation. It is characterized that outlet valve openings 12a, 12b, 12c provided on the valve seat surface of the valve body or the single valve seat surface 3 are arranged such that they are provided on circumferences of radii r different from an axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve for switching a flow path of a plurality of valve ports provided on a valve seat within a range of less than one rotation of a valve body, and more particularly to a control valve from the center of the valve seat. The present invention relates to a control valve in which outlet valve ports are arranged on circumferences having different radii.

Conventionally, an electric switching valve disclosed in Japanese Patent Application Laid-Open No. 2000-310348 has been proposed as a control valve for switching between a plurality of directions for applications such as switching between a refrigeration circulation cycle and a refrigeration circulation cycle of a refrigerator. This conventional electric switching valve (hereinafter, referred to as a control valve) is, as shown in FIG.
The rotor assembly 40 is composed of a valve body holder 39, a rotor body 44, and a magnet 45 that are slidable in the vertical direction with respect to the center shaft 42 and rotatable together with the shaft, and a lower opening is provided outside the rotor assembly 40. Cylindrical cup-shaped case 4
8 are arranged. The lower end of the case 48 is fixed to the valve body 21.

The valve body 21 has a valve hole 24 formed at an upper end surface thereof.
It is 6. In addition, an inflow pipe 2 is provided on the side of the valve body 21.
7 are provided, and two outflow valve ports 34 are provided on the surface of the valve seat 26.
And 35 are formed, which communicate with the outlet pipes 30 and 31. Reference numeral 47 denotes a compression coil spring provided between the lower end of the rotor main body 44 and the flange of the valve body holder 39.

In the above control valve, the valve body holder 39 and the valve body 39 are excited by an exciting action between the electromagnetic coil 32 and the magnet 45 of the rotor assembly 40 based on a control pulse current from an external control unit. 25 is rotated at a desired rotation angle in accordance with a desired rotation direction and the number of pulses, and positioned at a desired rotation angle position.

FIG. 4 is an explanatory view of a conventional valve body for opening / closing, restricting, and switching of a control valve. In this figure, reference numeral 3
Reference numeral 6 denotes a groove which acts as a throttle hole.
Extends in the appropriate radial direction from the outer periphery of the outflow valve port 35. Further, in this control valve, the inner and outer peripheral shapes of the rib portion 37 formed on the lower surface of the valve body 25 are semicircular, and in the state (A) of FIG. And the outflow valve port 34 and the concave groove 36 are in a range outside the outer periphery of the rib portion 37. Therefore,
The inflow pipe connection 27 communicates with the outflow valve port 34 in the fully open state, and communicates with the outflow valve port 35 using the concave groove 36 as a throttle, so that the refrigerant flows from the inflow side A (see the control valve shown in FIG. 3). It flows to the outflow side B at a fully open flow rate, but flows to the outflow side C at a reduced flow rate.

In the state (B), the refrigerant flows into the inflow side A
Flows to the outflow side B at full open flow rate, but does not flow to the outflow side C. In the state (C), the refrigerant flows from the inflow side A to the outflow side B at a gradually decreasing flow rate, but does not flow to the outflow side C. In the state (D), the refrigerant does not flow from the inflow side A to the outflow side B, but flows to the outflow side C at a fully open flow rate.

As described above, in the conventional control valve, a flow path switching involving various and various throttling functions can be performed. Therefore, when the control valve is used in a cooling circuit of a refrigerator or a refrigerator, for example, appropriate refrigerant flow path switching, that is, That is, appropriate cooling control can be performed.

[0008] As a conventional technique, although not shown, a valve having two or more outflow valve ports on a valve seat surface is disclosed in, for example, Japanese Patent No. 2711516.
There is a valve driving device disclosed in JP-A-1-4051.

[0009]

However, in any of the above control valves, the plurality of outlet ports on the outflow side are arranged on the circumference of the same radius r with respect to the axis of the valve seat surface. ,
Since the pitch of the valve ports cannot be reduced with a small control valve, the number of valve ports is restricted. Also, in this type of switching valve, the opening and closing or restricting control of the valve port is performed by rotating and sliding the valve element within a range of less than one rotation, so that the control angle (rotation angle) of the valve element is small. It was not possible to perform fine aperture control.

[0010]

According to the present invention, in the conventional control valve, each outlet valve port is arranged on the circumference of the same radius r with respect to the axis of the valve seat surface. Due to the restriction of the valve and the control angle (rotation angle) of the valve body became small, it was not possible to perform fine throttle control, but the valve port was also arranged on a circle with a different radius from the center of the valve seat. The purpose of the present invention is to provide a control valve capable of arbitrarily controlling the throttle in a range from fully closed to fully open, without being restricted by the number of valve ports or the control angle of the valve body. It is.

That is, in the present invention, the valve element is rotated by driving means such as a stepping motor so as to engage with the rotor, and the valve element makes one rotation on the valve seat surface of the valve body or on a single valve seat surface. By rotating and sliding within a range of less than the above, in the control valve to adjust the opening and closing of a plurality of valve ports communicating with each outlet passage to control the flow path, on the valve seat surface of the valve body, Alternatively, the arrangement of the outlet valve ports 12a, 12b, 12c provided on the surface of the single valve seat 3 is also provided on a circumference having a different radius r with respect to the axis. It is.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a control valve of the present invention. FIG. 2 shows an operation state diagram of the valve element according to the present invention. The control valve of the present invention includes a closed case 1, a coil 2, a valve seat 3, a shaft 4, a rotor 5, a valve body 6, a stopper 7, and a compression coil spring 10.
However, among the above-mentioned components, the difference from the conventional product is that the outlet valve ports 12a, 12b, 12c provided in the valve seat 3
It is needless to say that the structure of other components other than the valve seat is not limited.

A coil 2 is disposed outside a closed case 1 having a stepped portion 1a, and a valve seat 3 is hermetically fixed to a lower end of an opening of the case.

On the upper surface of the valve seat 3,
Valve ports 11 communicating with the entrance passage 8 and a plurality of exit passages 9
(9a, 9b, 9c).
2a, 12b, 12c) are provided. Then, the outlet valve port 12a is on the circumference of _{r 1} with respect to the axis, 12c
It is provided, Moreover, on the circumference of _{r 2} outlet valve port 12b
Is provided. The radius r ₂ -the radius r ₁ is preferably equal to or greater than the valve diameter.

A compression coil spring 10, a rotor 5, and a valve body 6 are arranged on the shaft 4 from above.

The rotor 5 is provided at its lower end with a locking portion 5a for rotating the valve element, and is provided at a position opposed to the locking portion 5a and lowered to contact a stopper 7 described later. A contact portion 5b is provided.

The valve body 6 is provided with a rotation transmitting portion 6a which comes into contact with the locking portion 5a, and opens and closes an outlet valve port 12 (12a, 12b, 12c) of the valve seat 3 on the lower surface. For this purpose, a controller 6c having a sliding surface formed in an arc shape is provided. Although the detailed shape of the control section 6c is not shown, it goes without saying that the ON / OFF state of the refrigerant flowing from the outlet valve port and the throttle control can be performed depending on the form.

The stopper 7 is formed in a ring having an inverted U-shaped cross section and is press-fitted and fixed to the closed case 1. The stopper 7 is provided with a positioning piece 7b and a ring-shaped member. Above the inside, the contact portion 5
An arc-shaped stopper portion 7a that engages with b is provided. The shape of the stopper 7a may be a flat plate due to the number of pulses.

In the control valve of the present invention configured as described above, the plurality of valve bodies 6 communicate with the outlet passage 9 by rotating and sliding the valve body 6 on the surface of the valve seat 3 within a range of less than one rotation. The flow path can be controlled by adjusting the opening and closing of the valve ports 12 (12a, 12b, 12c).

FIG. 2 is a view showing the operating state of the present invention. Table 1 shows the inlet valve port 11 and the outlet valve port 12a when the valve element 6c rotates to (a) to (e). , 12b, and 12c are tables describing the open / closed state. As described above, when a plurality of outlet valve ports are provided on one valve seat, the number of outlet valve ports is increased by providing the positions of the valve ports on the circumference of different radii r ₁ and r _2. be able to. Also,
Although the flow rate characteristic diagram is not particularly shown, the same number of valve ports as the conventional product
If the number is two (for example, two), the rotation region (control region) of the valve element is doubled, so that the accuracy of the flow rate control at each valve port can be improved.

[0021]

[Table 1]

[0022]

As described above, the present invention employs a stepping motor system using a rotor, in which one valve is rotated by rotation of the rotor, and each outlet valve port is opened and closed in less than one rotation. In the valve, when a plurality of outlet valve ports are provided on the valve seat, the positions of the valve ports are provided on the circumference of different radii r ₁ and r _2. Rotation area of valve body (control area)
Can be doubled, so that the accuracy of flow control at each valve port can be improved. Further, when the rotation region (control region) of the valve body is the same, the number of outlet valve ports can be increased, and more flow path switching can be performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a control valve showing an embodiment of the present invention.

FIG. 2 is a diagram showing an operation state of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional electric switching valve.

FIG. 4 is an explanatory view of a valve body of the conventional electric switching valve for opening / closing, restricting, and switching the flow path.

[Explanation of symbols]

1 sealed case, 1a stage, 1b
Bearing part, 2 coil, 3 Valve seat, 3a Shaft hole, 4 shaft, 5
Rotor, 5a locking portion 5b contact portion, 6 valve body, 6a
Rotation transmission unit 6c control unit, 6d cavity, 7
Stopper, 7a Stopper part 7b Positioning piece 8 Inlet passage, 9 Outlet passage, 10 Compression coil spring, 11 Inlet valve port, 12 Outlet valve port.

Claims (1)

[Claims] A valve means is rotated by driving means such as a stepping motor so as to be engaged with a rotor, and the valve element is rotated on a valve seat surface of a valve body or a single valve seat surface in a range of less than one rotation. By rotating and sliding, a control valve that adjusts the opening and closing of a plurality of valve ports communicating with the respective outlet passages to control the flow path or the flow rate. The outlet valve ports (12a), (12b), and (12c) provided on the valve seat (3) surface are arranged on a circle having a different radius r with respect to the axis. Control valve.