Valve device and method for manufacturing the same

Abstract

The valve device includes a valve seat member. The material of the valve seat member includes metal. The valve seat member is processed and formed by a tensile process, and includes a connection part and a valve seat that are of an integral structure. In contrast to the connection part and the valve seat being formed to be machined by a machining method using a metal material block respectively, this arrangement reduces the material consumption and energy consumption in the processing of the valve seat member.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Patent Office on June 10, 2022, with an application number of 202210657084.0 and an invention title of "Valve Device and Its Manufacturing Method", and all its contents are incorporated herein by reference.

[0002] The present invention relates to the technical field of fluid control, and specifically relates to a valve device and its manufacturing method.

Background Art

[0003] Conventional valve devices include a connection part and a valve seat part. A valve port is formed in the valve seat part. The connection part and the valve seat part are fixed after being formed respectively, and are formed by cutting using a metal material block in a machining method. In this way, it will cause waste of materials and increase the energy consumption of processing.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The object of the present invention is to provide a valve device and its manufacturing method that can reduce the material consumption and energy consumption in the processing of the valve device.

Means for Solving the Problems

[0005] To achieve the above object, the valve device of the present invention includes a valve seat member and a valve body unit. The material of the valve seat member includes metal. The valve seat member is processed and formed by a stretching process, and includes a connection part and a valve seat part with an integral structure. The valve seat part includes a valve port part, and the valve port part has a valve port. The valve body unit includes a valve body part, and the valve body part is operable with respect to the valve port to adjust the flow area of the valve port.

[0006] Also, the manufacturing method of the present invention is applicable to the manufacturing of the above valve device. The step of taking the base material of the valve seat member. A step of processing and shaping the main body portion of the valve seat member by a tensioning process, The process includes the step of machining and shaping the valve opening portion by cutting. [Effects of the Invention]

[0007] In the present invention, the material of the valve seat member includes metal, and the valve seat member is formed by a tensile process, and includes a connecting portion and a valve seat portion which are integrally structured, and the connecting portion and the valve seat portion are formed by cutting using a metal material block in a machining method, and this arrangement reduces the material consumption and energy consumption of the processing of the valve seat member. [Brief explanation of the drawing]

[0008] [Figure 1] This is a front view of an electric valve provided by an embodiment of the present invention. [Figure 2] This is a cross-sectional view of the electric valve along the AA surface in Figure 1. [Figure 3] Figure 2 is a front view of the valve member. [Figure 4] Figure 3 is a cross-sectional view of the valve member along the BB surface. [Figure 5] This is a cross-sectional view of the valve seat member in the drawing from one viewing angle. [Figure 6] Figure 2 is a cross-sectional view of the coil unit from one viewing angle. [Figure 7] Figure 6 is a cross-sectional view from one viewing angle of another embodiment of the coil unit. [Figure 8] Figure 2 is a stereoscopic view of the nut unit from one viewing angle. [Figure 9] Figure 8 is a front view of the nut unit. [Figure 10] This is a cross-sectional view of the nut unit along the CC surface in Figure 9. [Figure 11] This is an enlarged view of section A in Figure 2. [Figure 12] This is an enlarged view of part A of another embodiment of the electric valve shown in Figure 2. [Figure 13] Figure 2 is a front view of the valve unit. [Figure 14] Figure 14 is a cross-sectional view of the valve body unit along the DD surface. [Figure 15] Figure 2 is a three-dimensional view of the rotor unit from one viewing angle. [Modes for carrying out the invention]

[0009] The present invention will be further described below with reference to the drawings and embodiments.

[0010] As shown in Figures 1 to 4, the first embodiment of the valve device of the present invention includes an electronic expansion valve, which will be described in detail below. The electric valve 100, which is a valve device of the present invention, includes a valve member 1, a valve body 2, and a coil unit 3. In this embodiment of the electric valve 100, the valve member 1 is fixedly connected to the valve body 2, the coil unit 3 is fixedly connected to the valve body 2, the valve body 2 includes a valve body chamber 21, and at least a portion of the valve member 1 is located in the valve body chamber 21. In other embodiments, the coil unit 3 may be fixedly connected to the valve member 1, and after both are installed, it is fixedly connected to the valve body 2. The coil unit 3 includes a stator unit 31 and an injection-molded section 32, the injection-molded section 32 covering at least a portion of the stator unit 31 by injection molding. The coil unit 3 is equipped with a housing chamber 33, and at least a portion of the valve member 1 is located in the housing chamber 33. The valve member 1 includes a valve seat member 11, a rotor unit 12, a valve body unit 13, a nut unit 14, and a sleeve 15. The valve body unit 13 is connected to the rotor unit 12, and at least a portion of the sleeve 15 is located in the housing chamber 33. The sleeve 15 includes a sleeve top portion 151 and a lower end opening 152, the lower end opening 152 of the sleeve 15 is welded and fixed to the valve seat member 11 and is sealed. The stator unit 31 is located outside the sleeve 15, the rotor unit 12 is located inside the sleeve 15, and by passing a predetermined current through the stator unit 31, an excitation magnetic field is generated to rotate the rotor unit 12. The rotor unit 12 rotates the valve body unit 13, and the valve body unit 13 is screwed to the nut unit 14, converting the rotation of the rotor unit 12 into an axial movement of the valve body unit 13 with respect to the valve seat member 11.

[0011] The valve body 2 in this embodiment is independently formed. The valve body 2 in other embodiments may be a part of other members, for example, a part of a connection block in an integrated unit or a part of a heat exchange unit.

[0012] In the axial direction of the axial or electric valve in this embodiment shown in FIG. 2, it refers to the extending direction of the valve body unit 13 or a direction parallel to the extending direction of the valve body unit 13. Relatively, the direction along the radial direction of the electric valve 100 is perpendicular to the direction along the axial direction of the electric valve 100. Of course, in the design process, there are inevitably certain errors, so here, parallel includes substantially parallel and does not need to be absolutely parallel. The coil unit 3 in FIG. 2 is defined to be located above the valve body 2 along the axial direction of the electric valve. In the present invention, up and down only indicate relative positions.

[0013] The material of the valve seat member 11 in this embodiment shown in FIGS. 2 to 5 includes metal. This valve seat member 11 is processed and formed by a stretching process. It can be understood that after the main body part of the valve seat member 11 is processed and formed by the stretching process, some steps, chamfers, concave grooves or through holes, etc. are further processed by a cutting method, or it may follow the reverse order. This valve seat member 11 includes a valve seat portion 111 and a connecting portion 112 that are of an integral structure. The valve seat portion 111 includes a valve port portion 1111, which has a valve port 1112. The electric valve 100 includes a valve body unit 13, and the rotor unit 12 operates the valve body unit 13 relative to the valve port 1112. That is, the valve body portion 133 of the valve body unit 13 is operable relative to the valve port 1112, and adjusts the flow area of ​​the valve port 1112. In this embodiment, the material of the valve seat member 11 is stainless steel, but of course, it may be other similar metal materials, and the tensile process includes metal tensioning processes such as pulling and pressing, or in other words, the tensile process includes the processing steps of metal tensioning processes such as pulling and pressing. In this embodiment, the base material of the valve seat member 11 may be, for example, a sleeve made of stainless steel, and the main body portion of the valve seat member 11 is processed and formed by a tensile process. Furthermore, this valve seat member 11 is formed by a tensioning process, and the valve seat member 11 is formed so that it is machined as a single unit using a metal block, or the connecting portion 112 and the valve seat portion 111 are each formed so that they are machined using a metal material block, or multiple members are formed so that they are machined, then fixed and connected to constitute the valve seat member 11. This arrangement reduces the energy and material consumption of the manufacturing process of the valve seat member 11.

[0014] In this embodiment shown in Figures 2 to 5, at least a portion of the valve seat member 11 is located in the valve body chamber 21, and the valve seat member 11 includes an integrally structured valve seat portion 111, a connecting portion 112, a communication portion 113, and a transition portion 114. The transition section 114 is located between the connecting section 112 and the communication section 113, and is connected to the connecting section 112 and the communication section 113, respectively. With respect to the communication section 113, the connecting section 112 is closer to the rotor unit 12, and the valve seat section 111 is located at the lower end of the communication section 113. Furthermore, the communication section 113 includes a first passage 1131, and the electric valve 100 includes a valve chamber 115, the wall forming the valve chamber 115 including the inner circumferential wall of the valve seat member 11, the first passage 1131 penetrates the communication section 113 along the radial direction of the electric valve 100 and communicates with the valve chamber 115, the valve chamber 115 communicates with the external space of the communication section 113 via the first passage 1131, that is, communicates with the valve body chamber 21, and the number of first passages 1131 may be installed according to the needs, and the first passages 1131 are distributed at regular intervals in the circumferential direction of the communication section 113.

[0015] In this embodiment shown in Figures 2 and 5, the valve seat portion 111 is located at the lower end of the communication portion 113 and extends inward relative to the communication portion 113. In other words, the valve seat portion 111 extends inward at a certain angle, and in this embodiment, the valve seat portion 111 is approximately perpendicular to the communication portion 113. Of course, it may also be angled upward or downward, or bent several times.

[0016] The valve port 1112 penetrates the valve seat portion 111 along the axial direction of the electric valve 100, and the valve port portion 1111 is located approximately at the center of the valve seat portion 111. The valve body unit 13 and the valve port portion 1111 are arranged coaxially, where coaxial arrangement includes approximately coaxial arrangement. In this embodiment, the valve opening portion 1111 is provided with a valve opening engagement portion 1113. The valve port engagement portion 1113 is processed or pre-processed after the main body portion of the valve seat member 11 has been processed and formed, and the valve port engagement portion 1113 is installed according to the needs of different flow curves and may be curved, flat or stepped, etc., and the valve body unit 13 engages with the valve port engagement portion 1113 to adjust the flow area of ​​the valve port 1112 and further adjust the flow rate of the valve port 1112.

[0017] In this embodiment shown in Figures 2 and 5, the valve seat member 11 includes a connecting portion 112, which is provided with a male threaded portion 1121 located on the outer peripheral wall of the connecting portion 112. The electric valve 100 includes the valve body 2, and the drawing does not show the specific shape of the male threaded portion, only the position of the male threaded portion 1121. The valve body 2 comprises a valve body chamber 21, and at least a portion of the valve seat member 11 is located in the valve body chamber 21. The valve body 2 also comprises a female threaded portion 22 that engages with a male threaded portion 1121. This female threaded portion 22 is located on the inner circumferential wall forming the valve body chamber 21. The specific shape of the female threaded portion is not shown in the drawing, only its position is indicated. The valve seat member 11 and the valve body 2 are connected by screws, and this removable connection facilitates the installation and removal of the valve seat member 11 and the valve body 2. In other embodiments, the valve seat member 11 and the valve body 2 may be attached in other removable ways, for example, by arranging an annular member (not shown in the figure) having a male threaded portion, and connecting the annular member and the valve body 2 by screw, thereby tightening the valve seat member 11 between the annular member and the valve body 2, or by fixing the valve seat member 11 to the valve body with a pin having a screw.

[0018] In this embodiment shown in Figures 2 to 5, the sleeve 15 is fixed and connected to the connection portion 112 of the valve seat member 11 and sealed by a welded surface. In this embodiment, the sleeve 15 is fixed to the valve seat member 11 by laser welding, or a welding method such as brazing may be used. The valve member 1 further includes an engaging portion 16, which is located above the male screw portion 1121 and comprises several engaging edges 161 distributed on the outer circumferential wall of the engaging portion 16. The engaging portion 16 is provided with an engaging hole, and at least a part of the valve seat member 11 and the sleeve 15 are located in the engaging hole. The engaging portion 16 and the valve seat member 11 are separate structures, and the engaging portion 16 is fixed and connected to the connecting portion 112 of the valve seat member 11. In this invention, the separate structure refers to the fact that the two are two separate molded members. The engaging portion 16 covers the connection point between the sleeve 15 and the valve seat member 11. In this embodiment, the sleeve 15 abuts against the connection portion 112 of the valve seat member 11 and is fixed by welding. Furthermore, the engaging portion 16 covers the welded connection point between the sleeve 15 and the valve seat member 11, thereby lowering the height of the valve seat member 11 and further reducing the overall height of the electric valve. The engaging portion 16, which acts as an external force application part for screwing the valve seat member 11 and the valve body 2 together, is equipped with, for example, six engaging edges 161. By applying force to the engaging portion 16 using a tool such as a hex wrench, the valve seat member 11 is tightened and fixed to the valve body 2. In this embodiment, the engaging portion 16 and the valve seat member 11 are welded by laser, but of course, in other embodiments, they may be welded by welding methods such as brazing. The engaging portion 16 and the valve seat member 11 are molded and then fixed and connected. Compared to forming the engaging portion 16 and the valve seat member 11 by machining them as a single unit using a metal block, this reduces the energy and material consumption of the machining process.

[0019] In this embodiment shown in Figures 2 to 5, the connecting portion 112 includes a first connecting portion 1122, which in turn includes a first stage portion 1123 and a second stage portion 1124. The first stage portion 1123 includes a first stage bottom wall 1123a and a first stage side wall 1123b, and the second stage portion 1124 includes a second stage bottom wall 1124a and a second stage side wall 1124b. The lower end opening 152 of the sleeve 15 abuts against the bottom wall 1123a of the first stage and is fixed by welding, and the lower end surface of the engaging portion 16 abuts against the bottom wall 1124a of the second stage and is fixed by welding. In this embodiment, the inner diameter of the sleeve 15 is slightly smaller than the side wall 1123b of the first stage. The sleeve 15 is fitted onto the bottom wall 1123a of the first stage and then welded to fix it in place. Of course, in other embodiments, the inner diameter of the sleeve 15 may be greater than or equal to the outer diameter of the side wall (1123b) of the first stage. In this embodiment, the outer diameter of the sleeve 15 is equal to the outer diameter of the second stage side wall 1124b, and the inner diameter of the engaging portion 16 is equal to the outer diameter of the second stage side wall 1124b, where "equal" includes "approximately equal," and this arrangement facilitates the positioning of the engaging portion 16 and the connecting portion 112. Of course, in other embodiments, the inner diameter of the engaging portion 16 may be larger than the outer diameter of the second stage side wall 1124b. In this embodiment, a portion of the lower end surface of the engaging portion 16 abuts against the bottom wall 1124a of the second stage, thereby limiting the lowest position of the engaging portion 16 relative to the connecting portion 112 during installation.

[0020] In this embodiment shown in Figures 2, 3, and 6, the engaging portion 16 is fixedly connected to the connecting portion 112, the electric valve 100 further includes a first sealing member 41, the top portion of the engaging portion 16 supports the first sealing member 41, and the coil unit 3 includes a housing groove portion 34. In this embodiment, the receiving groove 34 is formed at the lower end of the injection molding section 32 and includes a receiving groove 341. At least a portion of the first sealing member 41 is located in the housing groove 341, and the first sealing member 41 is in a compressed state and is tightened between the engaging portion 16 and the upper wall of the housing groove portion 34, or between the side wall of the housing groove portion 34 and the outer peripheral wall of the sleeve 15.

[0021] In this embodiment shown in Figures 2, 3, and 6, the engaging portion 16 and the connecting portion 112 are fixed and connected by welding, and an annular weld bead is formed at the welded location, sealing it with the weld bead. The housing groove 341 has a first opening 3411 facing the engagement portion 16 and a second opening 3412 facing the sleeve 15. The housing groove portion 34 includes a first upper wall 342 and a first side wall 343. The upper wall of the housing groove portion 34 includes the first upper wall 342, and the side wall of the housing groove portion 34 includes the first side wall 343. The first upper wall 342 and the engagement portion 16 are positioned opposite each other, and the first side wall 343 and the engagement portion 16 are positioned opposite each other. The first sealing member 41 is in a compressed state and is tightened between the upper end surface of the engagement portion 16 and the first upper wall 342, or between the first side wall 343 and the outer peripheral wall of the sleeve 15. When the first sealing member 41 is tightened between the upper end surface of the engaging portion 16 and the first upper wall 342, it can reduce the amount of external gas or liquid entering the gap between the coil unit 3 and the sleeve 15 through the gap between the engaging portion 16 and the first upper wall 342. In this embodiment, the first sealing member 41 is designated as the first sealing point, and the engagement portion 16 and the valve seat member 11 are welded together by laser, with a full-circumference weld surrounding the connection point between the two, forming an annular weld bead, which is designated as the second sealing point. The two sealing points work together to prevent external gases or liquids from entering the gap between the coil unit 3 and the sleeve 15 and affecting the coil unit 3 or the electrical control device provided on the top of the coil unit 3. For example, this prevents corrosive gases or liquids from affecting the claw pole of the coil unit 3, such as causing corrosion. In this embodiment, the first side wall 343 is inclined outward from top to bottom at a certain angle, although in other embodiments it may be approximately vertical. When the first sealing member 41 is tightened between the first side wall 343 and the outer peripheral wall of the sleeve 15, it reduces the amount of external gas or liquid entering the gap between the coil unit 3 and the sleeve 15 through the gap between the first side wall 343 and the sleeve 15. In this case, the first sealing member 41 is designated as the first sealing point, and the weld bead between the engaging portion 16 and the valve seat member 11 is designated as the second sealing point. By arranging the second sealing point, it is possible to further prevent external gas or liquid from entering the gap between the coil unit 3 and the sleeve 15 and affecting the coil unit 3 or the electrical control device provided on the top of the coil unit 3. For example, it is possible to prevent corrosive gas or liquid from affecting the claw pole of the coil unit 3, such as causing corrosion.

[0022] In other embodiments of this embodiment shown in Figures 2, 3, 6, and 7, the engaging portion 16 and the connecting portion 112 are fixed and connected by welding, an annular weld bead is formed at the welded location and sealed by the weld bead, the housing groove 341 has a first opening 3411 facing the engaging portion 16, and the housing groove portion 34 includes a first upper wall 342, a first side wall 343, and a second side wall 344. Furthermore, the upper wall of the accommodating groove 34 includes a first upper wall 342, and the side walls of the accommodating groove 34 include a first side wall 343 and a second side wall 344, with the first upper wall 342 facing the engaging portion 16 and the first side wall 343 facing the second side wall 344. The inner diameter of the first side wall 343 is larger than the inner diameter of the second side wall 344, and the first sealing member 41 is in a compressed state and is tightened between the upper end surface of the engaging portion 16 and the first upper wall 342. By arranging the first sealing member 41, the amount of external gas or liquid entering the gap between the coil unit 3 and the sleeve 15 through the gap between the engaging portion 16 and the first upper wall 342 is reduced. In this case, the first sealing member 41 is designated as the first sealing point, and the engaging portion 16 and the valve seat member 11 are welded together by laser, with a full-circumference weld surrounding the connection point between the two, forming an annular weld bead. This annular weld bead is designated as the second sealing point. The two sealing points work together to prevent external gas or liquid from entering the gap between the coil unit 3 and the sleeve 15 and affecting the coil unit 3 or the electrical control device provided on the top of the coil unit 3. For example, corrosive gas or liquid can prevent corrosion or other effects on the claw pole of the coil unit 3.

[0023] In this embodiment shown in Figures 2, 9, and 10, the nut unit 14 is fixed and connected to the connecting portion 112, at least a portion of the nut unit 14 is located in the valve chamber 115, at least a portion of the valve body unit 13 is located in the valve chamber 115, and the nut unit 14 is equipped with a hollow cylindrical guide portion 141. The guide portion 141 includes a storage chamber 1411, the lower end of the guide portion 141 is open, the axis of the guide portion 141 coincides with the axis of the valve body unit 13, the guide portion 141 includes a guide wall segment 1412 located on the inner circumferential wall of the guide portion 141, at least a portion of the valve body unit 13 is located in the storage chamber 1411, and at least a portion of the valve body unit 13 is slidably engaged with the guide wall segment 1412, the guide wall segment 1412 provides a guide to the valve body unit 13 and improves the coaxiality of the valve body unit 13.

[0024] In this embodiment shown in Figures 2, 9, and 10, the nut unit 14 further includes a substantially cylindrical support portion 144, the outer wall of which abuts against and engages with the inner wall of the connecting portion 112, or is gap-fitted, providing support or a certain mounting guide to the nut unit 14.

[0025] In this embodiment shown in Figures 2 to 5 and Figure 10, the inner diameter of the connecting portion 112 is larger than the inner diameter of the transition portion 114, and the inner diameter of the transition portion 114 is larger than the inner diameter of the communication portion 113. This arrangement facilitates the installation of the valve seat member 11. The electric valve 100 further includes a second sealing member 42 located between the first passage 1131 and the connecting portion 112, and a third sealing member 43 located between the first passage 1131 and the valve seat portion 111, wherein the second sealing member 42 is tightened between the transition portion 114 and the inner circumferential wall of the valve body chamber 21, and the third sealing member 43 is tightened between the communication portion 113 and the inner circumferential wall forming the valve body chamber 21. The valve body 2 includes a first flow passage 23 and a second flow passage 24. The first flow passage 23 is in direct communication with the valve chamber 115 by the first passage 1131, and when the valve opening 1112 is opened, the valve chamber 115 is in communication with the second flow passage 24 by the valve opening 1112. In this embodiment, the nut unit 14 is fixed and connected to the metal connecting piece 14, and the nut unit 14 is fixed and connected to the valve seat member 11 by the metal connecting piece 142, the metal connecting piece 142 is equipped with a balance hole 1421 (see Figure 8), and the valve chamber 115 communicates with the chamber where the rotor unit 12 is located by the balance hole 1421, thereby balancing the pressure of the two chambers and reducing the pressure for valve opening. Of course, in other embodiments, a balance hole may be opened in the radial direction of the nut unit. In this embodiment, the valve seat member 11 is provided with grooves for housing the second sealing member 42 and the third sealing member 43. Embodiments of the present invention further provide a manufacturing method. This manufacturing method is applied to the above-mentioned method for manufacturing an electric valve and includes the steps of taking a base material for the valve seat member 11, processing and shaping the main body portion of the valve seat member 11 by a tensioning process, and processing and shaping the valve opening portion 1111 by a cutting process. The manufacturing method provided in this embodiment reduces material consumption and energy consumption during the processing of the valve seat member 11.

[0026] The electric valve 100 in the second embodiment shown in Figures 2, 8 to 11, and 13 to 14 includes a rotor unit 12, a valve body unit 13, and a nut unit 14. The valve body unit 13 is fixedly connected to the rotor unit 12 or connected in such a way that its position is restricted. The valve body unit 13 includes a screw rod portion 131, which has a first male screw 1311. The drawing does not show the specific shape of the first male screw, only its position. The nut unit 14 includes a first female screw 143 that engages with the first male screw 1311. The first male screw 1311 and the first female screw 143 mesh together to form a screw feeding mechanism. The electric valve 100 is further equipped with a restoring elastic member 5. The first end 51 of the restoring elastic member 5 is in direct or indirect contact with the nut unit 14, the valve body unit 13 includes a first stopper portion 132, the second end 52 of the restoring elastic member 5 is in contact with the first stopper portion 132, and the first end 51 of the restoring elastic member 5 approaches the rotor unit 12 relative to the second end 52. Along the axial direction of the electric valve 100, the restoring elastic member 5 is positioned lower relative to the first female screw 143. This arrangement simplifies the structure of the electric valve and reduces the number of components related to the stopping mechanism.

[0027] In this embodiment, during the upward movement of the screw rod portion 131, the restoring elastic member 5 is in a compressed state when at least the first male screw 1311 has detached from the first female screw 143. With this arrangement, when the first male screw 1311 is disengaged from the first female screw 143, the restoring elastic member 5 applies a downward force to the valve body unit 13, thereby restoring the engagement between the first male screw 1311 and the first female screw 143. When the rotor unit 12 rotates in the valve closing direction, the first male screw 1311 and the first female screw 143 reconfigure the screw feeding mechanism, converting the rotation of the rotor unit 12 into a downward axial linear motion of the screw rod portion 131 relative to the nut unit 14. This arrangement prevents the first male screw 1311 from becoming disengaged from the first female screw 143 and being unable to re-engage it, and also simplifies the structure of the electric valve, reducing the number of components related to the stopping structure. The restorative elastic member 5 includes a spring, elastic plastic, or a structure similar to a spring function.

[0028] In another embodiment of this design, the restoring elastic member 5 is in a compressed state when the first male screw 1311 and the first female screw 143 are engaged, and the engagement includes partial engagement, that is, there is a situation in which the first male screw 1311 and the first female screw 143 are partially engaged. With this arrangement, the restoring elastic member 5 provides a preload force, causing the first male screw 1311 to tighten the first female screw 143, eliminating the screw gap between them, tightly engaging them, preventing the screw rod portion 131 from shaking, and reducing noise. The two embodiments described above may be used in combination or individually.

[0029] The nut unit 14 in this embodiment, shown in Figures 2, 8 to 11, and 13 to 14, includes a first part 61 and a second part 62. The first part 61 is positioned above the second part 62, and the first part 61 is substantially hollow cylindrical. The second part 62 is also substantially hollow cylindrical, and the first part 61 includes a first chamber 611, while the second part 62 includes a second chamber 621. Furthermore, the inner wall of the first section 61 constitutes the first chamber 611, the inner wall of the second chamber 621 constitutes the second chamber 621, the inner diameter of the first chamber 611 is smaller than the inner diameter of the second chamber 621, the first chamber 611 comprises the first chamber 6111, the second chamber 621 comprises the second chamber 6211, and the first chamber 6111 communicates with the second chamber 6211.

[0030] In this embodiment shown in Figures 2, 8 to 11, and 13 to 15, the first part 61 includes the first rotation stopper part 612. The first rotation-stopping portion 612 is located at the upper end of the first portion 61 and is provided to protrude upward from the upper surface of the first portion 61. Below the first rotation-stopping portion 612 in this embodiment, a reinforcing portion 613 is further provided. Furthermore, the reinforcing portion 613 improves the strength of the first rotation-stopping portion 612, and of course, in other embodiments, the reinforcing portion 613 may not be provided. In this embodiment, the first rotation stopper 612 and the first part 61 are molded as a single unit, which is convenient for processing. In other embodiments, they may be molded separately and then fixed and connected. Furthermore, the rotor unit 12 is equipped with a second rotation stopper 121. The rotor unit 12 includes a magnetic rotor 122 and a connecting plate 123. The magnetic rotor 122 is fixed and connected to the connecting plate 123 by injection molding, and the screw rod portion 131 is fixed and connected to the connecting plate 123. The method of fixed connection includes welding and riveting. The second rotation stopper portion 121 is molded into the connecting plate 123 and is located at the lower end of the connecting plate 123. The second rotation stopper portion 121 is provided so as to protrude downward from the lower surface of the connecting plate. The second rotation stopper 121 abuts against the first rotation stopper 612, limiting the lowest position of the rotor unit 12. As a result, after closing the valve opening 1112, the valve body unit 13 continues to rub against or move with the valve opening 1111 to close the valve. The contact area includes contact on the sides, as well as contact on the top and bottom surfaces. In this embodiment, the contact method is side contact, i.e., circumferential contact. In this embodiment, the two contacting surfaces of the two are both substantially vertical, and the first rotation stopper 612 and / or the second rotation stopper 121 in this embodiment are provided with inclined surfaces. Furthermore, this slope is not the surface where the two sides are in contact and their positions are restricted. For example, the slope on the second rotation stopper 121 is located on the opposite side of the surface that is in contact and its position is restricted. By arranging the slope, interference occurs between the two rotation stopper parts as the rotor rotates upward during valve opening, preventing interference between the two rotation stopper parts during the first rotation in the valve opening direction, thus preventing the valve from becoming unable to open.

[0031] In this embodiment shown in Figures 2, 8 to 11, and 13 to 14, the first chamber 611 includes a female screw segment 6112, the first female screw 143 is located in the female screw segment 6112, and the first chamber 611 further includes an internal guide segment 6113. Furthermore, the female thread segment 6112 approaches the connecting plate 123 relative to the internal guide segment 6113, the inner diameter of the internal guide segment 6113 is larger than the inner diameter of the female thread segment 6112, and the screw rod portion 131 includes the male thread segment 1312 and the external guide segment 1313. The first male screw 1311 is located on the male screw segment 1312, and relative to the external guide segment 1313, the male screw segment 1312 approaches the connecting plate 123, and the external guide segment 1313 is slidably engaged with the internal guide segment 6113, which provides a guide to the screw rod portion 131. Furthermore, the screw rod portion 131 includes a small-diameter portion 1314, which is located between the male screw segment 1312 and the external guide segment 1313. The outer diameter of the small-diameter portion 1314 is smaller than the outer diameter of the external guide segment 1313. By positioning the small-diameter portion 1314, the screw rod portion 131 is attached to the nut unit 14 from bottom to top, thus avoiding interference.

[0032] This arrangement, as shown in the drawing, simplifies the stopping mechanism of the electric valve, resulting in a simpler structure and a reduction in the number of components in the electric valve.

[0033] Referring to Figure 11, the nut unit 14 in this embodiment shown in Figures 2, 8 to 10 includes a rotating connector 63. The rotating connection part 63 connects the first part 61 and the second part 62, and has a first support surface 631 located above the second chamber 6211, and the first end 51 of the restoring elastic member 5 abuts against the first support surface 631.

[0034] In another embodiment of this design shown in Figures 2, 8 to 10 (refer to Figure 12), the electric valve further includes a support gasket 632. The lower end surface of the support gasket 632 is in contact with the restoring elastic member 5, and the upper end surface of the support gasket 632 is in contact with the first support surface 631. By positioning the support gasket 632, the difficulty of processing the nut unit 14 is reduced, and tilting of the restoring elastic member 5 due to the engagement surface between the nut unit 14 and the first end 51 of the restoring elastic member 5 being non-flat is prevented.

[0035] The valve body unit 13 in this embodiment, shown in Figures 2, 8 to 11, and 13 to 14, further includes a valve body portion 133 connected to a screw rod portion 131 so as to be position-restricted, the top portion of the valve body portion 133 being a first stopper portion 132, and the second end portion 52 of the restoring elastic member 5 being in contact with the top portion of the valve body portion 133.

[0036] In this embodiment shown in Figures 2, 8 to 11, and 13 to 14, the valve body 133 includes a valve body cover 1331, a valve needle portion 1332, and a position limiting block 1333. The position limiting block 1333 has a first hole 1334, a portion of the screw rod portion 131 is located in the first hole 1334, and a portion of the screw rod portion 131 extends into an inner chamber formed from the valve body cover 1331. The position limiting block 1333 is fixed and connected to the valve body cover 1331, and the screw rod portion 131 has a flange portion 1315. The flange portion 1315 is fixed to and connected to the screw rod portion 131, or integrally molded with it. The outer diameter of the flange portion 1315 is larger than the inner diameter of the first hole 1334. The flange portion 1315 abuts against the lower end surface of the position limiting block 1333, restricting the screw rod portion 131 from detaching from the valve body unit 13. The position limiting block 1333 is located on the position limiting block 1333 and has a tip surface. The second end portion 52 of the restoring elastic member 5 abuts against the tip surface of the position limiting block 1333. In this embodiment, the top portion of the position limiting block 1333 is the first stopper portion 132 of the screw rod portion 131, and by making the tip surface of the position limiting block 1333 flat, the second end portion 52 of the restoring elastic member 5 is prevented from tilting. The restoring elastic member 5 is fitted onto the screw rod portion 131, and the inner diameter of the restoring elastic member 5 is approximately equal to the outer diameter of the external guide segment 1313 of the screw rod portion 131. The external guide segment 1313 provides a constant guide to the restoring elastic member 5, preventing it from tilting. In other embodiments, the valve body portion 133 and the screw rod portion 131 are molded as a single unit, and the valve body portion 133 is provided on the screw rod portion 131. This arrangement reduces the development cost of the electric valve. In another embodiment of this design, an annular support piece (not shown in the figure) is provided on the top of the valve body 133, the lower end surface of the support piece abuts against the top of the valve body 133, and the second end 52 of the restoring elastic member 5 abuts against the upper end surface of the support piece.

[0037] In another embodiment of this design, the first stopper portion 132 includes a locking spring (not shown) and a gasket (not shown), the locking spring being locked and fixed to the screw rod portion 131, and the locking spring and gasket being positioned lower to the restoring elastic member 5. The second end 52 of the restoring elastic member 5 is in contact with the upper surface of the gasket, and the lower surface of the gasket is in contact with the locking spring. The restoring elastic member 5 is in a compressed state with at least the first male screw 1311 disengaged from the first female screw 143. In other embodiments, the stopper portion includes a gasket (not shown in the figure), and the gasket is positioned below the restoring elastic member 5. The gasket is welded and fixed to the screw rod portion 131, and the second end 52 of the restoring elastic member 5 abuts against the lower surface of the gasket. The restoring elastic member 5 is in a compressed state when at least the first male screw 1311 is detached from the first female screw 143.

[0038] The first male thread 1311 of the screw rod portion 131 and the first female thread 143 of the nut unit 14 are screw-engaged, and when the rotor unit 12 moves upward, the rotor unit 12 rotates, causing the screw rod portion 131 to rotate. This converts the rotation of the rotor unit 12 into upward axial motion of the screw rod portion 131 relative to the nut unit 14, causing the screw rod portion 131 to move upward. After the first male screw 1311 disengages from the first female screw 143, if the screw rod portion 131 is not continuously moving upward and it is necessary to close the valve opening 1112, the restoring elastic member 5 is always in a compressed state, so the screw rod portion 131 is always subjected to a downward elastic force, thereby restoring the engagement between the first male screw 1311 and the first female screw 143, and converting the rotation of the rotor unit 12 into downward axial motion of the screw rod portion 131 relative to the nut unit 14. In this embodiment, the function can be realized with a simple structure.

[0039] Hereinafter, the above embodiments are not intended to limit the present invention, but merely to illustrate it. While this specification has described the present invention in detail with reference to the above embodiments, those skilled in the art can amend or substitute equivalents to the present invention, and any improvements that do not depart from the spirit and scope of the invention are within the scope of the invention.

Claims

1. A valve device including a valve seat member (11) and a valve body unit (13), The material of the valve seat member (11) includes metal, The valve seat member (11) includes a connecting portion (112) and a valve seat portion (111), which are integral structures formed by a tensioning process. The valve seat portion (111) includes the valve opening portion (1111), The valve opening portion (1111) is provided with a valve opening (1112), The valve body unit (13) includes a valve body portion (133), The valve body (133) is movable relative to the valve opening (1112) and adjusts the flow area of ​​the valve opening (1112), The valve device includes a valve body (2), The valve body (2) includes a valve body chamber (21), At least a portion of the valve seat member (11) is located in the valve body chamber (21), The valve device is characterized in that the connecting portion (112) is detachably connected to the inner circumferential wall forming the valve body chamber (21) in the valve body (2).

2. The valve seat member (11) further includes a communication portion (113), The communication portion (113), the connecting portion (112), and the valve seat portion (111) are an integrated structure. The aforementioned communication section (113) includes a first passage (1131), The valve device comprises a valve chamber (115), The wall forming the valve chamber (115) includes the inner circumferential wall of the valve seat member (11), The valve body portion (133) of the valve body unit (13) is movable within the valve chamber (115), The valve device according to claim 1, characterized in that the first passage (1131) communicates with the valve chamber (115).

3. The valve seat portion (111) is located at the lower end of the communication portion (113) and extends inward relative to the communication portion (113). The valve opening (1112) penetrates the valve seat portion (111) along the axial direction of the valve device, The valve body unit (13) and the valve opening (1111) are arranged coaxially. The valve opening portion (1111) is provided with a valve opening engagement portion (1113), The valve device according to claim 2, characterized in that the valve body unit (13) is engageable with the valve port engaging portion (1113) and adjusts the flow area of ​​the valve port (1112).

4. The valve body (2) is provided with a female threaded portion (22) located on the inner circumferential wall forming the valve body chamber (21), The connecting portion (112) is provided with a male threaded portion (1121) that engages with the female threaded portion (22), The valve seat member (11) and the valve body (2) are connected by a screw, or The valve device includes an annular member, The annular member is provided with a male threaded portion that engages with the female threaded portion. The valve device according to claim 1, characterized in that the annular member and the valve body (2) are connected by a screw, and the valve seat member (11) is tightened between the annular member and the valve body (2).

5. The valve device includes a valve member (1), The valve member (1) includes the valve seat member (11) and the valve body unit (13), The valve member (1) further includes a sleeve (15) that is fixed and connected to the connection portion (112), The valve member (1) further includes an engaging portion (16), The engaging portion (16) and the valve seat member (11) are separate structures. The engaging portion (16) is fixed and connected to the connecting portion (112), and covers the connection point between the sleeve (15) and the connecting portion (112). The valve device according to claim 4, characterized in that the engaging portion (16) is provided with several engaging edges (161) distributed on the outer circumferential wall of the engaging portion (16).

6. The valve device further includes a first sealing member (41), The top portion of the engagement portion (16) supports the first sealing member (41), The valve device further includes a coil unit (3), The coil unit (3) is provided with a housing groove (34), The aforementioned receiving groove portion (34) is provided with a receiving groove (341), At least a portion of the first sealing member (41) is located in the receiving groove (341), The first sealing member (41) is in a compressed state, The valve device according to claim 5, characterized in that the first sealing member (41) is fastened between the engaging portion (16) and the upper wall of the housing groove portion (34), or between the side wall of the housing groove portion (34) and the outer peripheral wall of the sleeve (15).

7. The engaging portion (16) and the connecting portion (112) are fixed and connected by welding. An annular weld bead is formed at the welded area, and the weld bead seals the joint. The receiving groove (341) comprises a first opening (3411) facing the engaging portion (16) and a second opening (3412) facing the sleeve (15), The aforementioned receiving groove (34) includes a first upper wall (342) and a first side wall (343), The first upper wall (342) and the engaging portion (16) are arranged opposite each other. The first side wall (343) and the engaging portion (16) are arranged opposite each other. The first sealing member (41) is in a compressed state, The valve device according to claim 6, characterized in that the first sealing member (41) is fastened between the upper end surface of the engaging portion (16) and the first upper wall (342), or between the first side wall (343) and the outer peripheral wall of the sleeve (15).

8. The engaging portion (16) and the connecting portion (112) are fixed and connected by welding. An annular weld bead is formed at the welded area, and the weld bead seals the joint. The receiving groove (341) has a first opening (3411) facing the engaging portion (16), The receiving groove (34) includes a first upper wall (342), a first side wall (343), and a second side wall (344). The first upper wall (342) and the engaging portion (16) are arranged opposite each other. The first side wall (343) and the second side wall (344) are arranged opposite each other, The inner diameter of the first side wall (343) is larger than the inner diameter of the second side wall (344). The valve device according to claim 6, characterized in that the first sealing member (41) is in a compressed state and is tightened between the upper end surface of the engaging portion (16) and the first upper wall (342).

9. The aforementioned connecting portion (112) includes the first connecting portion (1122), The first connecting portion (1122) includes a first stage portion (1123) and a second stage portion (1124), The first step portion (1123) includes a first step portion bottom wall (1123a) and a first step portion side wall (1123b), The second step portion (1124) includes a second step portion bottom wall (1124a) and a second step portion side wall (1124b), The lower end opening (152) of the sleeve (15) is in contact with the bottom wall (1123a) of the first step and is fixed by welding. The lower end surface of the engaging portion (16) abuts against the bottom wall (1124a) of the second step portion and is fixed by welding. The inner diameter of the sleeve (15) is less than or equal to the outer diameter of the first stepped side wall (1123b), and the outer diameter of the sleeve (15) is equal to the outer diameter of the second stepped side wall (1124b). The valve device according to any one of claims 7 to 8, characterized in that the inner diameter of the engaging portion (16) is greater than or equal to the outer diameter of the second step side wall (1124b).

10. The valve seat member (11) includes a nut unit (14) that is fixed and connected to the connecting portion (112). At least a portion of the nut unit (14) is located in the valve chamber (115), At least a portion of the valve body unit (13) is located in the valve chamber (115), The nut unit (14) is equipped with a hollow cylindrical guide portion (141), The guide portion (141) is equipped with a storage chamber (1411), and the lower end of the guide portion (141) is open. The axis of the guide portion (141) coincides with the axis of the valve body unit (13), The guide portion (141) includes a guide wall segment (1412) located on the inner circumferential wall of the guide portion (141). At least a portion of the valve body unit (13) is located in the storage chamber (1411), The valve device according to any one of claims 5 to 8, characterized in that at least a portion of the valve body unit (13) is slidably engaged with the guide wall segment (1412).

11. The nut unit (14) further includes a substantially cylindrical support portion (144), The valve device according to claim 10, characterized in that the outer wall of the support portion (144) abuts against and engages with the inner wall of the connecting portion (112), or is fitted in a gap, to support the nut unit (14) or to provide a certain mounting guide.

12. The valve seat member (11) further includes a transition portion (114) located between the connecting portion (112) and the communicating portion (113), The inner diameter of the connecting portion (112) is larger than the inner diameter of the transition portion (114). The inner diameter of the transition portion (114) is larger than the inner diameter of the communication portion (113). The valve device further includes a second sealing member (42) located between the first passage (1131) and the connecting portion (112), and a third sealing member (43) located between the first passage (1131) and the valve seat portion (111). The second sealing member (42) is tightened between the transition portion (114) and the inner circumferential wall forming the valve body chamber (21). The valve device according to claim 10, characterized in that the third sealing member (43) is fastened between the communication portion (113) and the inner circumferential wall forming the valve body chamber (21).

13. A method for manufacturing a valve device, applicable to the valve device described in any one of claims 1 to 8, The steps include removing the base material of the valve seat member (11), A step of processing and forming the main body portion of the valve seat member (11) by a tensioning process, A method for manufacturing a valve device, characterized by including the step of forming the valve opening portion (1111) by machining.

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