Search

KR-102963788-B1 - electric valve

KR102963788B1KR 102963788 B1KR102963788 B1KR 102963788B1KR-102963788-B1

Abstract

[assignment] An electric valve is provided that can omit a stopper provided on the magnet rotor and can stop the rotation of the magnet rotor when the movement of the valve body stops. [Solution] The electric valve (1) has a valve body (10) having a valve opening (15) and a valve seat (16) surrounding the valve opening (15), a valve body (40) facing the valve opening (15), a valve shaft (34), and a stepping motor (66). A male screw (34c) is formed on the valve shaft (34). A female screw (13c) is formed on the valve body (10) to which the male screw (34c) is screwed. The male screw (34c) and the female screw (13c) form a transfer screw mechanism (33). The valve shaft (34) is fixed coaxially to the magnet rotor (31) of the stepping motor (66). The lower end of the valve shaft (34) is connected to the valve body (40). When the magnet rotor (31) rotates in the direction of the closing valve, the valve body (40) moves toward the valve opening (15). When the valve body (40) comes into contact with the valve seat (16), the movement toward the valve opening (15) of the valve body (40) is restricted.

Inventors

  • 요시다 타츠야
  • 아라이 유스케

Assignees

  • 가부시기가이샤 후지고오키

Dates

Publication Date
20260512
Application Date
20230327
Priority Date
20220421

Claims (12)

  1. An electric valve having a valve body having a valve port and a valve seat surrounding the valve port, a valve body facing the valve port, a valve shaft, a stepping motor, and a control device for controlling the stepping motor, The above valve shaft and the above valve body or the above valve body constitute a transfer screw mechanism, and The above valve shaft is fixed coaxially to the magnet rotor of the above stepping motor, and The end of the above valve shaft is connected to the above valve body, and When the above magnet rotor rotates in the direction of the closing valve, the valve body moves toward the valve opening, and When the above valve body comes into contact with the above valve seat, the above valve seat restricts the movement of the above valve body toward the above valve opening, and The control device inputs a pulse to the stepping motor in an initialization operation mode to rotate the magnet rotor in the direction of the closing valve, and acquires the position of the magnet rotor when the rotation of the magnet rotor in the direction of the closing valve is restricted as a reference position, The control device controls the position of the magnet rotor based on the reference position in a normal operating mode, and manages the position of the magnet rotor by the number of pulses input to the stepping motor, When the maximum number of pulses is input to the stepping motor while the magnet rotor is in the reference position, the magnet rotor rotates from the reference position to the unfolded position, and A valve body movement command received by the control device includes a valve opening degree corresponding to a target position of the magnet rotor, wherein the valve opening degree 0[%] corresponds to the reference position, and the valve opening degree 100[%] corresponds to the expanded position, and The above control device Receives the above valve body movement command from an external device, and When the valve opening degree is 0% or more and 100% or less, the magnet rotor is rotated so that the position of the magnet rotor becomes the target position corresponding to the valve opening degree, and An electric valve characterized by transmitting a command execution result to an external device indicating that an invalid valve opening degree has been received when the valve opening degree is less than 0[%] or greater than 100[%].
  2. delete
  3. delete
  4. delete
  5. delete
  6. delete
  7. delete
  8. delete
  9. delete
  10. delete
  11. delete
  12. delete

Description

electric valve The present invention relates to an electric valve. Patent document 1 discloses an example of a conventional electric valve. Such an electric valve is assembled into a refrigeration cycle having an air conditioner, etc. The electric valve has a valve body, a valve body, and a stepping motor for moving the valve body. The stepping motor has a magnet rotor and a stator. When a pulse is input to the stepping motor, the magnet rotor rotates. In response to the rotation of the magnet rotor, the valve body moves, and the flow rate of the fluid (refrigerant) flowing through the valve port of the valve body changes. FIG. 1 is a cross-sectional view of an electric valve according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the stator unit of an electric valve. FIG. 3 is a cross-sectional view of the valve body and the vicinity thereof when the valve body of an electric valve is in contact with the valve seat. FIG. 4 is a cross-sectional view of the valve body and the vicinity thereof when the valve body of an electric valve is separated from the valve seat. Figure 5 is a graph illustrating the relationship between the valve opening degree and the flow rate in an electric valve. Figure 6 is a functional block diagram of an electric valve. FIG. 7 is a cross-sectional view illustrating the configuration of a modified example of the electric valve of FIG. 1. FIG. 8 is a cross-sectional view of an electric valve according to a second embodiment of the present invention. FIG. 9 is a cross-sectional view of an electric valve according to a third embodiment of the present invention. (First embodiment) Hereinafter, an electric valve (1) according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 7. The electric valve (1) is assembled, for example, into a refrigeration cycle of an air conditioner and operates in response to a command from a control unit (400) of the air conditioner. The control unit (400) is an external device located outside the electric valve (1). FIG. 1 is a cross-sectional view of an electric valve according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a stator unit of an electric valve. FIG. 3 and FIG. 4 are cross-sectional views of a valve body and its vicinity of an electric valve. FIG. 3 shows a state in which the valve body is in contact with a valve seat. FIG. 4 shows a state in which the valve is separated from the valve seat. FIG. 1, FIG. 3, and FIG. 4 show the valve shaft and valve body of the electric valve in a frontal view. FIG. 5 is a graph illustrating the relationship between the valve opening degree and the flow rate in an electric valve. FIG. 6 is a functional block diagram of an electric valve. FIG. 7 is a cross-sectional view illustrating the configuration of a modified example of the electric valve of FIG. 1. As shown in FIGS. 1 and 2, the electric valve (1) has a valve body (10), a can (20), a driving mechanism (30), a valve body (40), and a control device (80). The valve body (10) is made of a metal such as an aluminum alloy. The valve body (10) has a body member (11), a flow path block (12), and a support member (13). The main body member (11) has a cylindrical shape. The main body member (11) has a valve chamber (14), a valve port (15), and a valve seat (16). The valve port (15) is open to the valve chamber (14). The valve seat (16) is an inwardly tapered surface in the shape of a ring. The valve seat (16) surrounds the valve port (15) in the valve chamber (14). The inner circumference (16a) of the valve seat (16) is connected to the upper end (15a) of the valve port (15). The main body member (11) has a first attachment hole (11a). The first attachment hole (11a) is positioned on the upper surface (11b) of the main body member (11). The flow block (12) has a rectangular shape. The flow block (12) has a second attachment hole (12a). The second attachment hole (12a) is positioned on the upper surface (12b) of the flow block (12). The main body member (11) is positioned in the second attachment hole (12a). The main body member (11) is attached to the flow block (12) by a screw structure. The upper surface (11b) of the main body member (11) and the upper surface (12b) of the flow block (12) are on the same plane. The main body member (11) and the flow block (12) are provided with a flow path (17) and a flow path (18). The flow path (17) is connected to the valve chamber (14). The flow path (18) is connected to the valve chamber (14) through the valve port (15). Additionally, in the electric valve (1), the flow block (12) may be omitted, and the main body member (11) may have a rectangular shape. The support member (13) has a cylindrical shape. The support member (13) is positioned in the first attachment hole (11a). The support member (13) is attached to the main body member (11) by a screw structure. The upper portion of the support member (13) p