JP-2026514344-A - Pilot valve seat, pilot valve, and directional control valve

JP2026514344AJP 2026514344 AJP2026514344 AJP 2026514344AJP-2026514344-A

Abstract

This application proposes a pilot valve seat, a pilot valve, and a directional control valve. The pilot valve seat includes a valve seat body (100) having a plurality of pilot valve ports (101) for connecting a capillary assembly, the valve seat body (100) having an arcuate surface (102) having a housing space, the housing space being spaced apart from the pilot valve ports (101). When welding the conduit (200) and capillary assembly, the pilot valve seat is installed inside the conduit (200), the arc-shaped surface (102) of the valve seat body (100) is brought into contact with the inner wall of the conduit (200), and the capillary assembly is inserted into the corresponding pilot valve port (101). Since the housing space is positioned away from the pilot valve port (101), it does not interfere with the installation of the capillary assembly. Next, filler material is added to the outer surfaces of the conduit (200) and capillary assembly and welding is performed. During the welding process, the filler material flows into the housing space of the valve seat body (100), reducing the possibility of filler material flowing outside the range of the pilot valve seat and forming weld blobs, thereby reducing the risk of flow welding and ensuring that the distance between the conduit (200) port and the pilot valve seat satisfies the positioning requirements. [Selection Diagram] Figure 1

Inventors

丁海虎
蔡斌

Assignees

浙江盾安人工環境股▲ふん▼有限公司

Dates

Publication Date: 20260511
Application Date: 20240719
Priority Date: 20230724

Claims (10)

A pilot valve seat comprising a valve seat body provided with a plurality of pilot valve ports for connecting a capillary assembly, wherein the valve seat body has an arc-shaped surface with a housing space, and the housing space is spaced apart from the pilot valve ports.
The pilot valve seat according to claim 1, characterized in that the valve seat body has a first end and a second end arranged opposite to each other along the axial direction, and the housing space is located between the pilot valve port and the first end.
The pilot valve seat according to claim 2, characterized in that the aforementioned housing space is a stepped recess, and the stepped recess extends across the entire end face of the first end of the valve seat body.
The pilot valve seat according to claim 3, wherein the length of the stepped recess is A, such that 0.5 mm ≤ A ≤ 0.5L, the depth of the stepped recess is H1 , such that 0.2 mm ≤ H1 ≤ 0.5H, L is the minimum distance between the end face of the first end of the valve seat body and the edge of the pilot valve port, and H is the thickness of the valve seat body.
The pilot valve seat according to claim 2, characterized in that the aforementioned housing space is a groove, and the groove extends along the circumferential direction of the arc-shaped surface.
The pilot valve seat according to claim 5, wherein the width of the groove is B, then 0.5 mm ≤ B ≤ (L 1 - 0.5 mm), the depth of the groove is H 2 , then 0.2 mm ≤ H 2 ≤ 0.5 H, L 1 is the distance between the groove wall away from the first end of the groove and the end face of the first end, where 1 mm ≤ L 1 ≤ (0.5L - 0.5 mm), L is the minimum distance between the end face of the first end of the valve seat body and the edge of the pilot valve port, and H is the thickness of the valve seat body.
The pilot valve seat according to claim 5, characterized in that the shape of the groove bottom projected onto the datum plane is a straight line or a curve, and the datum plane passes through the axis of the valve seat body and intersects with the valve seat body.
A pilot valve seat according to any one of claims 1 to 7, characterized in that a guide slope is provided at the connection point between the lower surface of the valve seat body and the first end of the valve seat body.
A pilot valve comprising a conduit, a capillary assembly, and a pilot valve seat according to any one of claims 1 to 8, wherein the valve seat body is located inside the conduit, the capillary assembly is welded to the pilot valve port, the arcuate surface of the valve seat body is welded to the inner wall of the conduit, and the opening of the housing space faces the inner wall of the conduit.
A directional control valve characterized by including the pilot valve described in claim 9.

Description

Cross-reference of related applications This disclosure claims priority based on Chinese patent application No. 202321963902.6, filed on 24 July 2023, which is incorporated herein by reference in its entirety. This disclosure relates to the technical field of valves, and more particularly to pilot valve seats, pilot valves, and directional control valves. In related technologies, a pilot valve includes a conduit, a pilot valve seat, a lead, a slider, and a core. The pilot valve seat is fixedly mounted within the conduit by welding and has multiple pilot valve ports for supplying refrigerant fluid. Capillary tubes are welded to the pilot valve ports, and a slider is pressed against the pilot valve seat by a lead and driven by a core to slide the slider against the pilot valve seat, thereby connecting two adjacent pilot valve ports via the slider. In the welding process of the capillary tube, pilot valve seat, and conduit, if too much filler material is added or the welding temperature is too high, a weld blob will form at the weld between the conduit and the pilot valve seat. This will cause the distance between the conduit opening and the pilot valve seat to fail to meet the positioning requirements, affecting the core's stroke. As a result, the slider will not be able to completely cover the two pilot valve openings that should communicate, leading to a loss of pilot valve function. This is a schematic diagram of the configuration of the pilot valve seat according to an embodiment of the present disclosure.This is a schematic diagram of the pilot valve seat from another viewpoint according to an embodiment of the present disclosure.This is a left side view of a pilot valve seat according to an embodiment of the present disclosure.This is a front view of a pilot valve seat according to an embodiment of the present disclosure.This is another schematic diagram of the pilot valve seat configuration according to an embodiment of the present disclosure.Figure 5 is a schematic diagram of the pilot valve seat from a different viewing angle.Figure 5 is a left side view of the pilot valve seat.Figure 5 is a front view of the pilot valve seat.This is a schematic diagram of the third type of pilot valve seat configuration according to an embodiment of the present disclosure.This is a schematic diagram of a partial configuration of a pilot valve seat according to an embodiment of the present disclosure.This is a magnified view of area I in Figure 10. The exemplary embodiments will be described more fully below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Rather, by providing these embodiments, the disclosure becomes comprehensive and complete, and the concepts of the exemplary embodiments are comprehensively communicated to those skilled in the art. In the drawings, the same reference numerals represent the same or similar components, and their detailed description is omitted. As shown in Figures 1 to 11, this embodiment provides a pilot valve seat and includes a valve seat body 100 provided with a plurality of pilot valve ports 101 for connecting a capillary assembly. The valve seat body 100 has an arc-shaped surface 102, the arc-shaped surface 102 is provided with a housing space, which is spaced apart from the pilot valve ports 101. The pilot valve seat provided in this embodiment is installed on the conduit 200 when welding the conduit 200 and capillary assembly. The arc-shaped surface 102 of the valve seat body 100 is connected to the inner wall of the conduit 200, and the capillary assembly is inserted into the corresponding pilot valve port 101. Since the housing space is positioned away from the pilot valve port 101, it does not interfere with the installation of the capillary assembly. Next, filler material is added to the outer surfaces of the conduit 200 and the capillary assembly and welding is performed. During the welding process, the filler material flows into the housing space of the valve seat body 100, reducing the possibility of filler material flowing outside the range of the pilot valve seat and forming weld blobs. This reduces the risk of flow welding and ensures that the distance between the conduit port 200 and the pilot valve seat satisfies the positioning requirements. In one embodiment, as shown in Figures 1 and 2, the valve seat body 100 further has a lower surface 103, which faces the arcuate surface 102. There are three pilot valve ports 101, which penetrate both the arcuate surface 102 and the lower surface 103 of the valve seat body 100. Exemplarily, the area of the hole located on the arcuate surface 102 of the pilot valve port 101 is larger than the area of the hole located on the lower surface 103 of the pilot valve port 101. In one embodiment, the valve seat body 100 has a first end 11 and a second end 12 arranged opposite each other