JP4002738B2 - Electric flow control valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the upper valve body and the lower valve body that rotate together with the rotor by the driving means of the stepping motor are reversibly operated less than one rotation, and the two throttle valves are rotated by the rotation of the valve body less than one rotation. The present invention relates to an electric flow control valve for controlling the opening degree of any one of the parts, and in particular, to make the rotation start point position of rotation of the upper valve body and the lower valve body less than one rotation with high accuracy and to apply to the coil The present invention relates to an electric flow control valve that ensures the accuracy of the actual valve opening with respect to the number of pulses.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various types of electric flow control valves have been devised which are controlled by a microcomputer by combining a stepping motor and a valve integrated with a valve shaft.
FIG. 5 shows the structure of a conventional control valve filed by the present applicant in Japanese Patent Application No. 2000-297869, and the configuration thereof will be described below.
A conventional electric flow control valve includes a cylindrical case 31, an upper valve seat 32 and a lower valve seat 33 that are hermetically fixed to both ends of the cylindrical case 31, a cylindrical rotor 34, and the rotor. The upper valve body 35 and the lower valve body 36, the shaft 37, and the fixed coil 38 are rotated together.
[0003]
The cylindrical case 31 has a cylindrical shape in which both end surfaces are opened with a nonmagnetic metal.
[0004]
The upper valve seat 32 and the lower valve seat 33 are disk-shaped, and shaft holes 32a and 33a are provided at the center thereof, and valve ports 32b and 33b are provided at positions slightly away from the center. ing.
Further, in order to stabilize the rotation of the valve body, the valve port 32b is located at a position opposite to the valve ports 32b and 33b about the shaft 37 on the sliding surfaces of the upper valve seat 32 and the lower valve seat 33. A disc-shaped contact surface 32c that protrudes from the valve seat surface at a plurality of locations including around 33b is provided integrally with each valve seat. In addition, communication holes 35g and 36g are provided in the wall surfaces of the upper valve body 35 and the lower valve body 36, respectively.
Inflow and outflow pipes 39a and 39b are airtightly fixed to the valve openings 32b and 33b of the valve seat.
[0005]
The upper valve seat 32 and the lower valve seat 33 are airtightly fixed to both ends of the cylindrical case 31, and a stopper 40 is fixed to the lower valve seat 33.
[0006]
A piston ring 44 is provided on the outer peripheral surfaces of the upper valve body 35 and the lower valve body 36, and the piston ring 44 allows the inner peripheral surface of the cylindrical case 31, the upper valve body 35, The refrigerant can be prevented from flowing into the gap between the body 36 and the outer peripheral surface of the rotor 34.
[0007]
The cylindrical rotor 34 is provided with notches (not indicated) at the upper end and the lower end thereof, and the notches are provided with protrusions 35c of an upper valve body 35 and a lower valve body 36 described later, The rotor 34, the upper valve body 35, and the lower valve body 36 are positioned in the rotational direction.
[0008]
The upper valve body 35 and the lower valve body 36 have a cylindrical shape, shaft holes 35a and 36a are provided at the center thereof, and the rotor 34 side of the upper valve body 35 and the lower valve body 36 has an inner diameter of the rotor. And a projection 35c, 36c corresponding to the notch of the rotor.
[0009]
Further, the upper valve body 35 and the lower valve body 36 are provided with grooves 35d and 36d whose cross-sectional areas gradually change with the rotation direction at positions corresponding to the valve ports 32b and 33b of the upper and lower valve seats, communication hole 35b at a position where the cross-sectional area of the groove is maximum, 36b are provided, as shown in FIG. 5, the valve port 3 2 b → upper valve body of the outgoing inlet refrigerant pipe 39 a → upper valve seat sheet 3 2 3 5 communicating hole 35 b → valve port of the internal → lower valve body 3 6 communicating hole 3 6 b → lower valve seat sheet 3 3 of rotor 34 of 3 3 b → to flow into the inlet and delivering pipes 39 b ing. Needless to say, when the flow direction of the refrigerant is reversed by switching between cooling and heating in the heat pump refrigeration cycle, the refrigerant flow path described above is reversed.
[0010]
Further, the lower valve body 36 is provided with a locking piece 36f corresponding to the stopper 40 of the lower valve seat, which is described above. The rotation end position when the valve body and the lower valve body rotate is regulated.
[0011]
Further, in the conventional electric flow control valve, in the configuration of the electric flow control valve described above, the upper valve body 35 and the upper valve seat 32 constitute the upstream throttle valve portion 41, and the lower valve body 36 and the lower valve The seat valve 33 constitutes a downstream throttle valve portion 42.
[0012]
The shaft 37 is a rotating shaft of the rotor 34, the upper valve body 35, and the lower valve body 36. Both ends of the shaft 37 are pivotally supported by shaft holes 32a and 33a of the upper valve seat 32 and the lower valve seat 33, respectively. At the same time, the shaft holes 35a and 36a of the upper valve body and the lower valve body are penetrated.
[0013]
The refrigerant flowing in from the communication port 36b of the lower valve body 36 flows into the valve port 33b of the lower valve seat 33 through the groove 36d whose sectional area gradually changes as the valve body rotates. The flow rate is restricted by the size of the cross-sectional area of the groove 36d at the position where it abuts on the valve port 33b of the lower valve seat 33. That is, the refrigerant passing amount can be adjusted by the rotational position of the lower valve body 36 that is rotated by the rotation of the rotor 34 less than one rotation, and the capacity control of the refrigeration cycle can be performed.
[0014]
[Problems to be solved by the invention]
However, in the electric flow control valve shown in FIG. 5, when the rotation less than one rotation is rotated in the closing direction or the opening direction and mechanically stopped by the stopper 40, the excitation pattern of the stepping motor is used as the origin. The excitation pattern to be used is not set.
For this reason, at the start of use as an electric flow control valve, the initialization operation is performed by giving a pulse signal from the microcomputer (the number of pulses larger than the number of pulses to be fully closed to the fully closed state), and the mechanical operation by the stopper 40 is performed. Even if the rotation is stopped at the origin position of the rotation, when the excitation pattern used as the origin, which is the final excitation pattern of the initialization operation, is obtained, the fixed coil 38 having magnetism in the excitation pattern used as the origin is used. A magnetic pole different from the magnetic pole teeth 38a of the rotor 34 in which N poles and S poles are alternately magnetized in the circumferential direction moves to a position coincident with the rotation direction of the magnetic pole teeth 38a, and the stopper comes into contact therewith. 2 pulse width or less for 2-phase excitation and 4 pulse width or less for 1-2 phase excitation. Positional deviation of the will happening.
[0015]
And since the rotation start point of the flow rate control operation is the above-mentioned shifted position, even if the number of pulses for obtaining a predetermined opening is applied to the coil, the opening will be different by the amount of the shift described above. There arises a problem that proper flow control cannot be performed.
[0016]
This problem is not a big problem for needle-type electric flow control valves with various precedents of multi-rotation type with a total pulse number of about 500 pulses, but with a total pulse number of about 75 pulses by turning less than one rotation. In the conventional electric flow control valve shown in FIG. 5 for controlling the flow rate, there has been a big problem that the accuracy of flow control cannot be ensured.
[0017]
[Means for Solving the Problems]
According to the present invention, an upstream throttle valve portion and a downstream throttle valve portion that can obtain different flow characteristics composed of a valve seat and a valve body are formed on an upper portion and a lower portion of a cylindrical case, respectively. An upper valve body and a lower valve body that can rotate integrally with the rotor within a predetermined range are provided on the upper and lower parts, respectively, and the valve seat of the throttle valve section is caused by the pressure of the one of the valve bodies. When the other valve element is separated from the valve seat, the throttle valve portion on the upstream side of the refrigerant is fully opened regardless of the position of the driving means, and only the throttle valve portion on the downstream side is used as the throttle valve. In the electric flow control valve that is made to function and automatically uses two throttle valve mechanisms depending on the flow direction of the refrigerant, the magnetic pole teeth of the fixed coil, the upper valve seat seat, the lower valve seat seat, and the stopper are mutually connected Set so that it is in the specified position. The fixed-side restraining part is configured by the assembly so that the N-pole and S-pole magnetization patterns of the rotor rotating integrally with the upper valve body and the lower valve body are in a predetermined position. The stepping motor excitation pattern is the excitation pattern used as the origin when it is mechanically stopped by contacting the fixed side stop and the moving side stop. Accordingly, an object of the present invention is to provide an electric flow control valve with improved flow control accuracy.
[0018]
That is, the electric flow control valve according to claim 1 is an upper valve seat in which valve ports 32b and 33b are provided at positions offset from the center at the upper end and the lower end of the nonmagnetic cylindrical case 31, respectively. 32 and a lower valve seat 33, and a cylindrical rotor 34 disposed in the case 31 has an upper valve body that is separated from the end of the rotor at the upper and lower portions thereof and can rotate integrally therewith. 35 and a lower valve body 36 are provided, and the upper valve body 35 and the upper valve seat seat 32 constitute an upstream throttle valve portion 41, and the lower valve body 36 and the lower valve seat seat 33 constitute a downstream throttle valve. The upper valve body 35 and the lower valve body 36 are reversibly operated integrally with the rotor 34 by the driving means of the stepping motor, and the two throttle valves are rotated by rotating the valve body less than one rotation. To control the opening of any part The electric flow control valve which performs control of the capacity of the refrigeration cycle by adjusting the refrigerant passage of the heat pump type refrigerating cycle,
When determining the origin of rotation of the rotor 34, the upper valve body 35, and the lower valve body 36 that rotate integrally, the magnetic pole teeth 38a of the fixed coil 38, the upper valve seat 32, and the lower valve seat 33 The stopper 40 is assembled so as to be in a predetermined position to form a fixed-side restraining portion, and the N-pole / S-pole magnetization pattern of the rotor 34 that rotates integrally, and the upper valve body 35 and the lower valve body 36 are assembled so as to be in a predetermined position to constitute a moving side stop portion,
When the valve body is rotated in the closing direction or opening direction in less than one rotation and mechanically restrained by contacting the stationary-side restraining part and the moving-side restraining part, the excitation pattern of the stepping motor is used as the origin. This is an excitation pattern to be used.
[0019]
Further, the electric flow control valve according to claim 2 is arranged such that the coil is fixed to the upper valve seat 32 or the lower valve seat 33 when positioning the fixed coil 38 with the upper valve seat 32 or the lower valve seat 33. The coil bracket 47 for fitting and fixing 38 is provided integrally with the fixed coil 38. The coil bracket 47 is provided with a bracket convex portion 47a corresponding to a predetermined position of the magnetic pole teeth 38a of the fixed coil 38. The seat seat 32 or the lower valve seat seat 33 is provided with one or a plurality of valve seat seat recesses 32d corresponding to the bracket projections 47a so as to satisfy a predetermined requirement. 1.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an electric flow control valve of the present invention. 2A and 2B are perspective views of the upper valve seat according to the present invention, in which FIG. 2A shows a state diagram viewed from the lower surface, and FIG. 2B shows a state diagram viewed from the upper surface.
3A and 3B are perspective views of the lower valve seat according to the present invention, in which FIG. 3A shows a state diagram viewed from the upper surface, and FIG. 3B shows a state diagram viewed from the lower surface. FIG. 4 is an exploded perspective view showing an assembled state of the stationary coil, the upper and lower valve seats, the upper and lower valve bodies, and the rotor of the present invention.
[0021]
The electric flow control valve of the present invention is different from the conventional product shown in FIG. 5 in that the upper and lower parts of the cylindrical case 31 are composed of upper and lower valve seats 32 and 33 and upper and lower valve bodies 35 and 36, respectively. An upstream throttle valve portion 41 and a downstream throttle valve portion 42 capable of obtaining a flow rate characteristic are configured, and an upper portion and a lower portion of the rotor 34 are integrated with the rotor 34 within a predetermined range, respectively. An upper valve body 35 and a lower valve body 36 that can rotate are provided.
Further, when the one valve body (for example, the lower valve body 36) is brought into contact with the valve seat of the throttle valve portion by the pressure of the refrigerant, the other valve body (upper valve body 35) is provided so as to be separated from the valve seat. As a result, the throttle valve portion on the upstream side of the refrigerant is fully opened regardless of the position of the drive means, and only the throttle valve portion on the downstream side functions as a throttle valve, and automatically has two throttle valve mechanisms depending on the flow direction of the refrigerant. Is used properly.
[0022]
That is, in the electric flow control valve of the present invention, the component configuration as the flow control valve and the operating principle of the valve body are the same as those of the conventional product, and thus detailed description thereof is omitted.
[0023]
As shown in FIGS. 1 and 4, the electric flow control valve according to the present invention determines the origin of rotation of the rotor 34, the upper valve body 35, and the lower valve body 36 that rotate together. The magnetic pole teeth 38a, the upper valve seat sheet 32 and the lower valve seat sheet 33, and the stopper 40 are assembled so as to be in a predetermined position to form a fixed-side restraining portion.
That is, the coil bracket 47 is integrally provided on the fixed coil 38, and the upper and lower end portions of the coil bracket 47 are fitted to the upper valve seat 32 and the lower valve seat 33 to form the cylindrical case 31. A fixed coil (38) is arranged around the.
[0024]
The coil bracket 47 is provided with a bracket convex portion 47a corresponding to a predetermined position of the magnetic pole teeth 38a of the fixed coil 38. On the other hand, on the upper valve seat 32, the bracket convex portion 47a A plurality of valve seat recesses 32d are provided so as to correspond to one or a predetermined requirement. The predetermined requirement in the case where a plurality of the valve seat recesses 32d are provided is the repetitive pitch angle of the magnetic pole teeth 38a provided at a plurality of positions in the fixed coil 38 at equal intervals. Is a position shifted in the rotation direction at a pitch of 30 °. By fitting the bracket convex portion 47a into the valve seat seat concave portion 32d, in the illustrated example, the position of the stopper 40 provided on the upper valve seat seat 32 is relative to the magnetic pole teeth 38a of the fixed coil 38. The fixed-side stop portion is configured so as to be in a predetermined position.
[0025]
The rotor 34 is alternately magnetized with N and S poles in the circumferential direction. The N 34 and S pole magnetization patterns of the rotor 34 and the upper valve body 35 and the lower valve body 36 are mutually connected. It is assembled so as to be in a predetermined position. Also, in the illustrated example, the lower valve body 36 is provided with a locking piece 36f for contacting the stopper 40 at a predetermined position. That is, the stop piece on the moving side is configured such that the locking piece 36f is at a predetermined position with respect to the N-pole / S-pole magnetization pattern of the rotor 34.
In this way, by configuring the fixed-side stop portion and the moving-side stop portion, the valve body rotates in a closing direction or an opening direction in less than one rotation, and the fixed-side stop portion and the moving-side stop portion are rotated. When the parts are mechanically stopped by contact, the excitation pattern of the stepping motor is set to be the excitation pattern used as the origin.
[0026]
The electric flow control valve of the present invention configured as described above,
When the rotation of the rotor is stopped by the contact between the fixed side stop and the moving side stop, the excitation pattern of the stepping motor is set to be the excitation pattern used as the origin. If the initialization operation is performed by giving a pulse signal from the microcomputer (the number of pulses that is greater than the number of pulses that are fully opened to the fully closed state) at the start of use of the microcomputer, The excitation pattern used as the origin, which is the final excitation pattern, is the position of the rotor after initialization and the contact position of the stopper, which is the original origin position. Therefore, unlike the conventional product, the origin position of the rotor does not shift after the rotor hits the stopper and stops.
[0027]
【The invention's effect】
As described above, in the electric flow control valve of the present invention, the N-pole / S-pole magnetization pattern of the rotor that rotates integrally with the valve body, and the upper valve body and the lower valve body are located at predetermined positions. As a result, the stepping motor's excitation pattern is used as the origin when it is mechanically stopped by contacting the fixed side stop and the moving side stop. Therefore, unlike the conventional product, the origin position of the rotor does not shift after the rotor hits the stopper during the initialization operation and stops, so that the accuracy of flow control can be improved.
[0028]
Further, since the valve body rotates in engagement with the rotor and adjusts the opening degree of the valve by rotating the valve seat seat surface by less than one rotation, When configuring the moving-side restraining portion, the assembly of the parts can be easily performed if the angles and dimensions of the parts are set. In other words, the conventional needle valve type electric flow control valve that controls the valve body by rotating the valve body many times requires a complicated design and adjustment because of the screw propulsion structure. There is nothing.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
2A and 2B are perspective views of the upper valve seat according to the present invention, in which FIG. 2A shows a state diagram viewed from the bottom surface, and FIG. 2B shows a state diagram viewed from the top surface.
FIGS. 3A and 3B are perspective views of a lower valve seat according to the present invention, in which FIG. 3A shows a state diagram viewed from the upper surface, and FIG. 3B shows a state diagram viewed from the lower surface;
FIG. 4 is an exploded perspective view showing an assembled state of the fixed coil, the upper and lower valve seats, the upper and lower valve bodies, and the rotor according to the present invention.
FIG. 5 is a longitudinal sectional view of a conventional electric flow control valve.
[Explanation of symbols]
31 cylindrical case, 32 upper valve seat,
33 Lower valve seat, 32a, 33a Shaft hole,
32b Valve port 32c Contact surface,
32d Upper valve seat seat recess 33b Valve port,
33c contact surface, 34 rotor,
34a, 34b notch, 35 upper valve body,
36 lower valve body, 35a, 36a shaft hole,
35b, 36b communication hole, 35c, 36c protrusion,
35d, 36d groove,
35e, 36e the position where the cross-sectional area of the groove is maximum,
36f locking piece, 37 shaft,
38 fixed coils, 38a magnetic pole teeth,
39a, 39b inflow / outflow pipe, 40 stopper,
41 Throttle valve section on the upstream side, 42 Throttle valve section on the downstream side,
44 piston ring, 47 coil bracket,
47a Bracket convex part.

Claims (1)

An upper valve seat (32) and a lower valve seat (32) are provided with valve ports (32b, 33b) at positions eccentric from the center at the upper and lower ends of the nonmagnetic cylindrical case (31), respectively. 33), and a cylindrical rotor (34) disposed in the case (31) has an upper valve body (in the upper and lower portions thereof, which is separated from and contacting the end of the rotor and can be integrally rotated). 35) and a lower valve body (36), and the upper valve body (35) and the upper valve seat (32) constitute an upstream throttle valve portion (41), and the lower valve body (36) The lower valve seat (33) forms a downstream throttle valve portion (42), a stopper (40) is fixed to the lower valve seat (33), and the lower valve body (36) the stopper (40) and the abutment for engaging piece for (36f) is provided at a predetermined position, scan The upper valve body (35) and the lower valve body (36) are reversibly operated integrally with the rotor (34) by the driving means of the ping motor, and the two throttle valve portions are rotated by the rotation of the valve body less than one rotation. In the electric flow control valve that controls the capacity of the refrigeration cycle by adjusting the refrigerant passage amount of the heat pump refrigeration cycle that controls any one of the opening degrees, the rotor (34) that rotates integrally, the upper valve When determining the origin of rotation of the body (35) and the lower valve body (36), the magnetic pole teeth (38a) of the fixed coil (38), the upper valve seat (32) and the lower valve seat (33) , A fixed-side restraining portion is assembled by assembling the stopper (40) so as to be in a predetermined position, and the N-pole and S-pole magnetization patterns of the rotor (34) rotating integrally; The upper valve body (35) and the lower valve body (36) are mutually connected. By assembling so as to be in a predetermined position, a moving-side restraining portion is configured, and the valve body is rotated in a closing direction or an opening direction in less than one rotation, and the fixed-side stopper (40) and the moving-side engaging member are engaged. An electric flow rate control valve characterized in that when the stop piece (36f) is mechanically stopped by contact, the excitation pattern of the stepping motor is an excitation pattern used as an origin.

Images