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Motor-operated valve

An electric valve, valve core technology, applied in the direction of lift valve, valve details, valve device, etc., can solve problems such as deviation

Active Publication Date: 2018-11-09
SAGINOMIYA SEISAKUSHO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

) will also produce a bias

Method used

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  • Motor-operated valve
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Figure 4 (a) is a cross-sectional view schematically showing a main part of the electric valve 2 in the first embodiment. Such as Figure 4 As shown in (a), the characteristic surface 31 is inclined outward at a constant inclination angle from the valve port 16 toward the valve body 17 . In addition, the minimum flow path area Sa of the valve port 16 is formed to be smaller than the truncated cone side area Stmax in the fully open state (Sa<Stmax). Thus, by setting Sa<Stmax, whether the fluid is introduced from the spool 17 side and the fluid is taken out from the valve port 16, or the fluid is introduced from the valve port 16 side and the fluid is taken out from the spool 17 side, , the flow rate in the fully open state depends on the minimum flow path area Sa of the valve port 16. Therefore, by designing the electric valve 2 so that Sa<Stmax, the flow rate in the fully open state is only governed by the minimum flow path area Sa of the valve port 16, and is not a...

Embodiment 2

[0065] Figure 6 (a) is a cross-sectional view schematically showing a main part of the electric valve 2 in the second embodiment. Here, the second embodiment is a modified example of the first embodiment, and the description of the same structure as the first embodiment will be omitted, and only the different parts will be described. Such as Figure 6 As shown in (a), the characteristic surface 31 of the valve seat member 30A is inclined outward at a constant inclination angle from the valve port 16 toward the valve body 17 . In addition, an inner peripheral wall 32 is formed on the valve seat member 30A. The inner peripheral wall 32 rises upward from the upper end of the characteristic surface 31 and surrounds the lower end of the valve element 17 in the valve closed state.

[0066] Here, the electric valve 2 of the embodiment 2 is designed so that the side area Stmax of the truncated cone is smaller than the minimum flow path area Sa of the valve port 16 (Stmax

Embodiment 3

[0075] Figure 8 (a) is a cross-sectional view schematically showing a main part of the electric valve 2 in the third embodiment. Such as Figure 8 As shown in (a), regarding the electric valve 2, in the electric valve 2 of the second embodiment, the inner peripheral wall 32 of the valve seat member 30A is slightly inclined upward and outward. Therefore, in making Figure 8 When the inner peripheral wall 32 shown in (a) extends downward, the extension lines of the left and right inner peripheral walls 32 intersect at a predetermined angle θs (θs>0°). In addition, since Example 3 is a modified example of Example 2, description of the same structure as Example 2 is abbreviate|omitted, and only a different part is demonstrated.

[0076] Figure 8 (b) is a graph showing a comparison of the flow rate characteristics of the electric valve 2q, the electric valve 2r, and the electric valve 2s having different valve opening points. Such as Figure 8 As shown in (b), if a pulse is...

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Abstract

To reduce individual differences in the maximum flow-rate. A motor-operated valve in which the rotational motion of a rotor is converted into linear motion via the screw coupling of a male screw member and a female screw member, a valve body housed in a valve main body is moved in the axial direction on the basis of the linear motion, a back-pressure chamber is provided to the upper side of the valve body, and pressure from inside a valve port is guided into the backpressure chamber. The motor-operated valve is provided with a valve seat having a characteristic face that determines the flow-rate of the clearance formed between the valve body. A line connecting the shortest distance between the characteristic face and the lower-end outer peripheral edge of the valve body is contained in a side face. In a frustum hypothetically formed between the valve body and the valve seat, the minimum passage area of the valve port is formed so as to be smaller than the area of the side face of the frustum when the valve body is in a fully open state.

Description

technical field [0001] The present invention relates to electric valves used in refrigeration cycles and the like. Background technique [0002] Conventionally, flow control valves used in cabinet air conditioners and refrigeration equipment are known (for example, refer to Patent Document 1). In this flow control valve, it is desired to have a large diameter and to perform well even when a high pressure difference is generated, based on the background of rationalization of control equipment such as integrating a plurality of electric valves used for flow control into one. However, for flow control with a large diameter, compared with the screw thrust generated by the torque of the magnet, the load on the spool due to the differential pressure is relatively large, and a large driving force is required to make the spool work. [0003] Therefore, in order to improve the operability of the valve body, the structure described below is employed. For example, in Figure 10 In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K31/04F16K1/36F16K1/42F25B41/06
CPCF16K1/36F16K1/42F16K31/04
Inventor 田边珠实石黑元康北见雄希中川大树
Owner SAGINOMIYA SEISAKUSHO INC
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