Pilot valve seat, pilot valve, and directional control valve
The pilot valve seat with an arc-shaped surface and housing space addresses welding defects by preventing filler overflow, maintaining precise alignment and port communication, thus ensuring the pilot valve's functionality.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT CO LTD
- Filing Date
- 2024-07-19
- Publication Date
- 2026-05-11
AI Technical Summary
The existing welding process in pilot valves often results in welding defects due to excessive filler material or high temperature, leading to misalignment of the conduit and pilot valve seat, which affects the slider's stroke and communication between ports, causing functional failure.
A pilot valve seat with an arc-shaped surface featuring a housing space or groove that accommodates filler material during welding, preventing overflow and ensuring precise positioning between the conduit and pilot valve seat.
Reduces the formation of welding blobs and maintains accurate positioning, ensuring effective communication between ports and functional integrity of the pilot valve.
Smart Images
Figure 2026514344000001_ABST
Abstract
Description
Technical Field
[0001] Cross - reference to Related Applications This disclosure claims priority based on Chinese Patent Application No. 202321963902.6, filed on July 24, 2023, the entire content of which is incorporated herein by reference.
[0002] This disclosure relates to the technical field of valves, particularly to pilot valve seats, pilot valves, and direction - switching valves.
Background Art
[0003] 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 attached inside the conduit by welding, and has a plurality of pilot valve ports for supplying refrigerant fluid. A capillary tube is welded to the pilot valve port. The slider is pressed against the pilot valve seat by the lead, and the core drives the slider to slide relative to the pilot valve seat to communicate two adjacent pilot valve ports through the slider.
[0004] In the welding process of the capillary tube, the pilot valve seat, and the conduit, if the amount of welding filler added is too much or the welding temperature is too high, a welding defect will be formed at the welded part of the conduit and the pilot valve seat, and the distance between the pipe opening of the conduit and the pilot valve seat cannot meet the positioning requirements. As a result, it affects the stroke of the core, and finally the slider cannot cover two pilot valve ports that should be communicated, causing the pilot valve to lose its function.
Summary of the Invention
Problems to be Solved by the Invention
[0005] The technical problem to be solved by this disclosure is how to provide a mounting bracket that can alleviate the eccentricity and vibration phenomena that occur when the laser distance - measuring sensor rotates.
[0006] The object of this disclosure is to provide a pilot valve seat, a pilot valve, and a directional control valve that reduce the possibility of welding blobs forming and ensure that the distance between the pipe opening of the conduit and the pilot valve seat satisfies positioning requirements. [Means for solving the problem]
[0007] Based on the above objectives, the Disclosure provides a pilot valve seat comprising a valve seat body having a plurality of pilot valve ports for connecting a capillary assembly, wherein the valve seat body has an arc-shaped surface, the arc-shaped surface is provided with a housing space, the housing space is spaced apart from the pilot valve ports.
[0008] In one embodiment of the present disclosure, the valve seat body has a first end and a second end arranged opposite to each other in the axial direction, and the housing space is located between the pilot valve port and the first end.
[0009] In one embodiment of the present disclosure, the housing space is a stepped recess, which extends across the entire end face of the first end of the valve seat body.
[0010] In one embodiment of the present disclosure, if the length of the stepped recess is A, then 0.5 mm ≤ A ≤ 0.5 L, if the depth of the stepped recess is H1, then 0.2 mm ≤ H1 ≤ 0.5 H, where 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.
[0011] In one embodiment of the present disclosure, the accommodation space is a groove, and the groove extends along the circumferential direction of the arc-shaped surface.
[0012] In one embodiment of the present disclosure, if the width of the groove is B, then 0.5 mm ≤ B ≤ (L1 - 0.5 mm), if the depth of the groove is H2, then 0.2 mm ≤ H2 ≤ 0.5 H, L1 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 ≤ L1 ≤ (0.5 L - 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.
[0013] In one embodiment of the present disclosure, the shape of the groove bottom projected into 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.
[0014] In one embodiment of the present disclosure, 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.
[0015] Based on the above objectives, the Disclosure further provides a pilot valve comprising a conduit, a capillary assembly, and the pilot valve seat, wherein the valve seat body is located inside the conduit, the capillary assembly is welded to the pilot valve port, and the arcuate surface of the valve seat body is welded to the inner wall of the conduit, such that the opening of the housing space faces the inner wall of the conduit.
[0016] Based on the above objectives, this disclosure further provides a directional control valve, the directional control valve including the pilot valve.
[0017] The beneficial effects of this disclosure are primarily as follows: The pilot valve seat provided in this disclosure includes a valve seat body having a plurality of pilot valve ports for connecting a capillary assembly, the valve seat body having an arc-shaped surface, the arc-shaped surface having a housing space, the housing space being spaced apart from the pilot valve ports. When welding a conduit and a capillary assembly, the pilot valve seat is placed on the conduit, the arc-shaped surface of the valve seat body is brought into contact with the inner wall of the conduit, and the capillary assembly is inserted into the corresponding pilot valve port. Since the housing space is spaced apart from the pilot valve port, it does not interfere with the installation of the capillary assembly. Then, filler material is added to the outer surfaces of the conduit 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, reducing the possibility of filler material flowing out of the range of the pilot valve seat and forming a weld blob, thus reducing the risk of flow welding and ensuring that the distance between the conduit opening and the pilot valve seat satisfies positioning requirements. [Brief explanation of the drawing]
[0018] [Figure 1] This is a schematic diagram of the configuration of the pilot valve seat according to an embodiment of the present disclosure. [Figure 2] This is a schematic diagram of the pilot valve seat from another viewpoint according to an embodiment of the present disclosure. [Figure 3] This is a left side view of a pilot valve seat according to an embodiment of the present disclosure. [Figure 4] This is a front view of a pilot valve seat according to an embodiment of the present disclosure. [Figure 5] This is another schematic diagram of the pilot valve seat configuration according to an embodiment of the present disclosure. [Figure 6] Figure 5 is a schematic diagram of the pilot valve seat from a different viewing angle. [Figure 7] Figure 5 is a left side view of the pilot valve seat. [Figure 8] Figure 5 is a front view of the pilot valve seat. [Figure 9] This is a schematic diagram of the third type of pilot valve seat configuration according to an embodiment of the present disclosure. [Figure 10]It is a schematic diagram of a partial structure of a pilot valve seat according to an embodiment of the present disclosure. [Figure 11] It is a partially enlarged view of location I in FIG. 10.
Embodiments for Carrying out the Invention
[0019] Hereinafter, exemplary embodiments will be more fully described 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 in this specification. Rather, by providing these embodiments, the present disclosure becomes comprehensive and complete, and the concept of the exemplary embodiments is comprehensively conveyed to those skilled in the art. In the drawings, the same reference numerals represent the same or similar configurations, and thus their detailed descriptions will be omitted.
[0020] As shown in FIGS. 1 to 11, this embodiment provides a pilot valve seat, including 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 arcuate surface 102, and an accommodation space is provided on the arcuate surface 102. The accommodation space is arranged at a distance from the pilot valve port 101.
[0021] When the pilot valve seat provided by this embodiment is welded to the conduit member 200 and the capillary assembly, the pilot valve seat is installed on the conduit member 200, the arcuate surface 102 of the valve seat body 100 is connected to the inner wall of the conduit member 200, and the capillary assembly is inserted into the corresponding pilot valve port 101. Since the accommodation space is arranged at a distance from the pilot valve port 101, it does not prevent the installation of the capillary assembly. Next, welding material is added to the outer surfaces of the conduit member 200 and the capillary assembly for welding. During the welding process, the welding material will flow into the accommodation space of the valve seat body 100. Therefore, the possibility of forming welding beads due to the welding material flowing out of the range of the pilot valve seat is reduced, the risk of flow welding is reduced, and it is ensured that the distance between the pipe opening of the conduit member 200 and the pilot valve seat meets the positioning requirements.
[0022] 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, and there are three pilot valve ports 101, which penetrate 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.
[0023] In one embodiment, the valve seat body 100 has a first end 11 and a second end 12 that are arranged opposite each other along the axial direction, and the housing space is located between the pilot valve port and the first end 11. During installation, the second end 12 of the valve seat body 100 is aligned with the open end of the conduit 200 and installed in the conduit 200, and after installation, the first end 11 of the valve seat body 100 faces the open end of the conduit 200.
[0024] As shown in Figure 10, the capillary assembly includes an E capillary 301, an S capillary 302, and a C capillary 303, with one end of each of the E capillary 301, S capillary 302, and C capillary 303 inserted into each of the three pilot valve ports 101 to facilitate welding.
[0025] The capillary assembly further includes a D capillary 304, which communicates with the end of the conduit 200 adjacent to the second end 12 of the valve seat body 100. Components such as sliders and cores are installed inside the conduit 200 from the end adjacent to the first end 11 of the valve seat body 100.
[0026] Since the containment space is located between the pilot valve port and the first end 11, during the welding process, the filler material closest to the first end 11 of the valve seat body will preferentially flow into the containment space. This reduces the possibility of filler material flowing outside the pilot valve seat area and forming weld blobs, thereby reducing the risk of flow welding and ensuring that the distance between the conduit port 200 and the pilot valve seat satisfies the positioning requirements. Furthermore, filler material that is far from the first end 11 of the valve assembly body will not typically affect positioning accuracy even if it flows outside the valve assembly body.
[0027] In one possible design, the housing space is a stepped recess 104a. Exemplarily, as shown in Figures 2 and 4, the stepped recess 104a is recessed from the arcuate surface 102 toward the lower surface 103, and the stepped recess 104a extends across the entire end face of the first end 11 of the valve seat body 100.
[0028] In this possible design, as shown in Figures 3 and 4, if the length of the stepped recess 104a is A, then 0.5 mm ≤ A ≤ 0.5 L, and if the depth of the stepped recess 104a is H1, then 0.2 mm ≤ H1 ≤ 0.5 H, where L is the minimum distance between the end face of the first end 11 of the valve seat body 100 and the edge of the pilot valve port 101, and H is the thickness of the valve seat body 100. This not only ensures the structural strength of the valve seat body 100 but also provides relatively ample space for excess filler material, reduces the possibility of filler material flowing out of the pilot valve seat area and forming weld blobs, 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.
[0029] It should be understood that the valve seat body 100 has an arc-shaped segment 105 located near the first end 11, and the thickness H of the valve seat body 100 refers to the radial distance between the arc-shaped segment 105 and the arc-shaped surface 102. The minimum distance between the end face of the first end 11 of the valve seat body 100 and the edge of the pilot valve port 101 refers to the minimum vertical distance between the end face of the first end 11 of the valve seat body 100 and the edge of the pilot valve port 101 located near the first end 11.
[0030] In this embodiment, the end face of the arc-shaped segment 105 can restrict the position of the core material of the pilot valve core. At the same time, for core material with a step at the end face, the avoidance space formed below the arc-shaped segment 105 can avoid the step in the core material.
[0031] In another possible design, as shown in Figure 5, the storage space is a groove 104b, which extends along the circumferential direction of the arcuate surface 102.
[0032] In this possible design, as shown in Figures 7 and 8, if B is the width of the groove 104b, then 0.5 mm ≤ B ≤ (L1 - 0.5 mm); if H2 is the depth of the groove 104b, then 0.2 mm ≤ H2 ≤ 0.5 H; L1 is the distance between the groove wall 1041b away from the first end 11 of the groove 104b and the end face of the first end 11, where 1 mm ≤ L1 ≤ (0.5 L - 0.5 mm); L is the minimum distance between the end face of the first end 11 of the valve seat body 100 and the edge of the pilot valve port 101; and H is the thickness of the valve seat body 100. This not only ensures the structural strength of the valve seat body 100 but also provides relatively ample space for excess filler material, reduces the possibility of filler material flowing out of the pilot valve seat area and forming weld blobs, 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.
[0033] As shown in Figures 6 and 7, the valve seat body 100 has an arc-shaped segment 105 located near the first end 11, and it should be understood that the thickness H of the valve seat body 100 refers to the radial distance between the arc-shaped segment 105 and the arc-shaped surface 102.
[0034] In the other possible designs, the shape of the groove bottom 1042b of the recessed groove 104b projected into the datum plane is either straight or curved, and the datum plane passes through the axis of the valve seat body 100 and intersects with the valve seat body 100.
[0035] In some embodiments, specifically as shown in Figure 8, the shape of the groove bottom 1042b of the recessed groove 104b projected into the datum plane may be a straight line, which facilitates manufacturing.
[0036] In other embodiments, the shape of the groove bottom 1042b of the recessed groove 104b projected into the datum plane may be a curve. For example, as shown in Figure 9, the shape of the curve may be an arc, and the direction of curvature of the arc may be away from the groove opening of the recessed groove 104b. In this embodiment, the volume of the containment space can be increased to some extent, and the possibility of welding lumps being formed by filler material flowing out of the range of the pilot valve seat is further reduced.
[0037] Of course, the shape of the curve can also be V-shaped, wavy, or other shapes.
[0038] In one embodiment, a guide slope 1031 is provided at the connection point between the lower surface 103 of the valve seat body 100 and the first end 11 of the valve seat body 100. Providing the guide slope 1031 facilitates the attachment of the slider.
[0039] As shown in Figures 10 and 11, this embodiment further provides a pilot valve comprising a conduit 200, a capillary assembly, and a pilot valve seat provided in this embodiment, wherein the valve seat body 100 is located inside the conduit 200, the capillary assembly is welded to the pilot valve port 101, and the arcuate surface 102 of the valve seat body 100 is welded to the inner wall of the conduit 200, with the opening of the housing space facing the inner wall of the conduit 200.
[0040] The pilot valve provided in this embodiment, by using the pilot valve seat provided in this embodiment, when welding the conduit 200 and the capillary assembly, is installed on 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 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 out of 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 port 200 and the pilot valve seat satisfies the positioning requirements.
[0041] In one embodiment, the capillary assembly includes an E capillary 301, an S capillary 302, a C capillary 303, and a D capillary 304, where one end of each of the E capillary 301, S capillary 302, and C capillary 303 is inserted into each of the three pilot valve ports 101 to facilitate welding, and the D capillary 304 is in communication with the end of the conduit 200 that is close to the second end 12 of the valve seat body 100.
[0042] The pilot valve further includes components such as a slider, a core, and a suction element. The slider and core are installed inside the conduit 200 from the end of the conduit 200 adjacent to the first end 11 of the valve seat body 100. The slider is connected to the core via a bracket, and the suction element is fixedly connected to the conduit 200. The core is detachable from or attracted to the suction element so as to drive the slider to slide against the valve seat body 100, thereby enabling communication between different capillaries. The operating principle of the pilot valve is prior art and will not be described again here.
[0043] This embodiment further provides a directional control valve, which includes a pilot valve provided in this embodiment.
[0044] The directional control valve provided in this embodiment ensures that the distance between the pipe opening of the conduit 200 and the pilot valve seat satisfies the positioning requirements by using the pilot valve provided in this embodiment, thereby ensuring effective control of the pilot valve over the directional control valve and achieving flow path switching.
[0045] For example, the directional control valve provided in this embodiment may be a four-way valve.
[0046] While this disclosure has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and illustrative, and not limiting. Since this disclosure can be specifically implemented in various forms without departing from its spirit or substance, the embodiments described above should be interpreted broadly within the spirit and scope limited by the appended claims, and not limited to any of the details described above. Accordingly, all modifications and variations that fall under the claims or within the equivalent scope thereof should be understood to be encompassed by the appended claims. [Explanation of symbols]
[0047] The explanation of the symbols is as follows: 100 Valve seat body 11 The first edge 12 The second end 101 Pilot valve port 102 Arc-shaped surface 103 Bottom surface 1031 Guide Slope 104a Stepped depression 104b Groove 1041b Groove wall 1042b Groove bottom 105 Arc-shaped segment 200 Conduit 301 E capillary 302 S capillary 303 C capillary 304 D Capillary
Claims
1. 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 provided with a housing space, and the housing space is spaced apart from the pilot valve ports.
2. 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.
3. The pilot valve seat according to claim 2, characterized in that the 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.
4. If the length of the stepped recess is A, then 0.5 mm ≤ A ≤ 0.5 L, and the depth of the stepped recess is H １ Therefore, 0.2 mm ≤ H １ The pilot valve seat according to claim 3, characterized in that H is ≤ 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.
5. The pilot valve seat according to claim 2, characterized in that the housing space is a groove, and the groove extends along the circumferential direction of the arc-shaped surface.
6. If the width of the groove is B, then 0.5 mm ≤ B ≤ (L １ -0.5 mm) and the depth of the groove is H ２ Therefore, 0.2 mm ≤ H ２ ≤ 0.5H, L １ L 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 The pilot valve seat according to claim 5, characterized in that ≤ (0.5L - 0.5 mm), where 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.
7. The pilot valve seat according to claim 5, characterized in that the shape of the groove bottom projected into 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.
8. The 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.
9. 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.
10. A directional control valve characterized by including the pilot valve described in claim 9.