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 Intellectual Property Administration on June 10, 2022, with the application number 202210657084.0 and the invention title "Valve Device and Its Manufacturing Method", and all of its contents are incorporated herein by reference.

[0002] The present invention relates to the technical field of fluid control, and more specifically, 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 being cut by a machining method using a metal material block respectively. 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 is provided with 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 forming the main body portion of the valve seat member by a tensile process; A step of processing and forming the valve port portion by cutting, is included.

Advantages of the Invention

[0007] In the present invention, the material of the valve seat member includes metal, and the valve seat member is processed and formed by a tensile process, and includes a connecting portion and a valve seat that are of an integral structure. The connecting portion and the valve seat are each formed by being cut and processed by a machining method using a metal material block. In contrast, this arrangement reduces the material consumption and energy consumption in the processing of the valve seat member.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Embodiments for Carrying out the Invention

[0009] Hereinafter, the present invention will be further described with reference to the drawings and examples.

[0010] As shown in FIGS. 1 to 4, in the first embodiment of the valve device according to the present invention, an electronic expansion valve is included, and will be specifically described hereinafter. The electric valve 100 which is the valve device of the present invention includes a valve member 1, a valve body 2, and a coil unit 3. And, in the electric valve 100 of this embodiment, 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 is provided with a valve body chamber 21, and at least a part of the valve member 1 is located in the valve body chamber 21. Also, in other embodiments, the coil unit 3 may be fixedly connected to the valve member 1, and after both are mounted, they are fixedly connected to the valve body 2. The coil unit 3 includes a stator unit 31 and an injection molding part 32, and this injection molding part 32 covers at least a part of the stator unit 31 by injection molding. And, the coil unit 3 is provided with a housing chamber 33, and at least a part 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, at least a part of the sleeve 15 is located in the housing chamber 33, the sleeve 15 includes a sleeve top part 151 and a lower end opening part 152, and the lower end opening part 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, and the rotor unit 12 is located inside the sleeve 15. By passing a predetermined current through the stator unit 31, an exciting 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 relative 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 this embodiment shown in FIG. 2, the axial direction of the axial or electric valve 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. Therefore, 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] In this embodiment shown in FIGS. 2 to 5, the material of the valve seat member 11 includes metal. This valve seat member 11 is processed and formed by a drawing process. It can be understood that after the main body part of the valve seat member 11 is processed and formed by the drawing process, some steps, chamfers, concave grooves or through holes are further processed by a cutting method, or vice versa. This valve seat member 11 includes a valve seat portion 111 and a connection portion 112 that are of an integral structure. And the valve seat portion 111 includes a valve port portion 1111, this valve port portion 1111 is provided with a valve port 1112, the electric valve 100 includes a valve body unit 13, the rotor unit 12 operates the valve body unit 13 with respect to the valve port 1112, that is, the valve body portion 133 of the valve body unit 13 is operable with respect to the valve port 1112 and adjusts the flow area of the valve port 1112. The material of the valve seat member 11 in this embodiment is stainless steel. Of course, other similar metal materials may also be used. The processing and forming by the tensile process include metal tensile processes such as pulling and pressing. In other words, the processing and forming by the tensile process include the processing process of metal tensile processes such as pulling and pressing. The base material of the valve seat member 11 in this embodiment may be, for example, a sleeve made of stainless steel material, and the main body portion of the valve seat member 11 is processed and formed by the tensile process. And this valve seat member 11 is processed and formed by the tensile process, and the valve seat member 11 is formed so as to be machined by cutting in an integral mechanical processing method using a metal block, or the connecting portion 112 and the valve seat portion 111 are each formed so as to be machined by cutting in a mechanical processing method using a metal material block, or a plurality of members are formed so as to be machined by cutting in a mechanical processing method and then fixed and connected to form the valve seat member 11. Compared with this, this arrangement reduces the energy consumption and material consumption of the processing of the valve seat member 11.

[0014] At least a part of the valve seat member 11 in this embodiment shown in FIGS. 2 to 5 is located in the valve body chamber 21, and the valve seat member 11 includes a valve seat portion 111, a connecting portion 112, a communicating portion 113, and a transition portion 114 that are of an integral structure. And this transition portion 114 is located between the connecting portion 112 and the communicating portion 113 and is connected to the connecting portion 112 and the communicating portion 113 respectively. With respect to the communicating portion 113, the connecting portion 112 is close to the rotor unit 12, and the valve seat portion 111 is located at the lower end of the communicating portion 113. Furthermore, the communication portion 113 includes a first passage 1131. The electric valve 100 includes a valve chamber 115. The wall forming this valve chamber 115 includes the inner peripheral wall of the valve seat member 11. The first passage 1131 penetrates the communication portion 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 portion 113 through the first passage 1131, that is, it communicates with the valve body chamber 21. The number of the first passages 1131 may be installed according to needs. In the circumferential direction of the communication portion 113, the first passages 1131 are distributed at regular intervals.

[0015] In the valve seat portion 111 in the present embodiment shown in FIGS. 2 and 5, it is located at the lower end of the communication portion 113 and extends inward with respect to the communication portion 113. In other words, the valve seat portion 111 extends inward at a certain angle. The valve seat portion 111 in the present embodiment forms a substantially right angle with respect to the communication portion 113. Of course, it may be closer to the top or bottom, or may be bent several times.

[0016] The valve port 1112 penetrates the valve seat portion 111 along the axial direction of the electric valve 100. The valve port portion 1111 is located at a substantially central position of the valve seat portion 111. The valve body unit 13 and the valve port portion 1111 are coaxially arranged. Here, the coaxial arrangement includes a substantially coaxial arrangement. The valve port portion 1111 in the present embodiment includes a valve port engaging portion 1113. And this valve port engaging portion 1113 is processed after the main body portion of the valve seat member 11 is processed and formed, or is processed in advance. The valve port engaging portion 1113 is installed according to the needs of different flow rate curves and may be arc-shaped, flat, or stepped, etc. The valve body unit 13 is engaged with the valve port engaging portion 1113 to adjust the flow area of the valve port 1112, and further adjust the flow rate of the valve port 1112.

[0017] The valve seat member 11 in the present embodiment shown in FIGS. 2 and 5 includes a connection portion 112. This connection portion 112 includes a male screw portion 1121 located on the outer peripheral wall of the connection portion 112. The electric valve 100 includes a valve body 2. In the drawing, the specific shape of the male screw portion is not shown, and only the position of the male screw portion 1121 is shown. The valve body 2 includes a valve body chamber 21, at least a part of the valve seat member 11 is located in the valve body chamber 21, the valve body 2 includes a female screw portion 22 that engages with the male screw portion 1121, and this female screw portion 22 is located on the inner peripheral wall forming the valve body chamber 21. In the drawings, the specific shape of the female screw portion is not shown, and only the position of the female screw portion 22 is shown. The valve seat member 11 and the valve body 2 are connected by screws, and by being connected in such a detachable manner, it 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 detachable manners. For example, an annular member (not shown in the drawings) having a male screw portion is arranged, and the annular member and the valve body 2 are connected by screws, and the valve seat member 11 is clamped between the annular member and the valve body 2, or the valve seat member 11 is fixed to the valve body by a pin having a screw.

[0018] The sleeve 15 in the present embodiment shown in FIGS. 2 to 5 is fixed and connected to the connecting portion 112 of the valve seat member 11 and is sealed by a welding surface. The sleeve 15 in the present embodiment is welded and fixed to the valve seat member 11 by a laser, and a welding method such as brazing may also be used. The valve member 1 further includes an engaging portion 16, and this engaging portion 16 is located above the male screw portion 1121 and has several engaging edges 161 distributed on the outer peripheral wall of the engaging portion 16. The engaging portion 16 includes an engaging hole, 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 have a separate structure, and the engaging portion 16 is fixed and connected to the connecting portion 112 of the valve seat member 11. The separate structure in the present invention refers to two members that are separately formed. The engaging portion 16 covers the connection location between the sleeve 15 and the valve seat member 11. The sleeve 15 in the present embodiment is abutted against the connecting portion 112 of the valve seat member 11 and is fixed by welding. And the engaging portion 16 covers the welded connection location between the sleeve 15 and the valve seat member 11, thereby reducing the height of the valve seat member 11 and further reducing the height of the entire electric valve. As an external force acting part for screwing and engaging the valve seat member 11 and the valve body 2, the engaging part 16 includes, for example, six engaging edges 161, and a tool such as a hexagon wrench is used to act on the engaging part 16 to tighten and fix the valve seat member 11 to the valve body 2. The engaging part 16 and the valve seat member 11 in this embodiment are welded by a laser. Of course, in other embodiments, they may be welded by a welding method such as brazing. The engaging part 16 and the valve seat member 11 are fixed and connected after being formed respectively. Compared with the case where the engaging part 16 and the valve seat member 11 are formed by machining and cutting integrally using a metal block, the energy consumption and material consumption of processing are reduced.

[0019] The connecting part 112 in this embodiment shown in FIGS. 2 to 5 includes a first connecting part 1122, and this first connecting part 1122 includes a first stepped part 1123 and a second stepped part 1124. And the first stepped part 1123 includes a first stepped part bottom wall 1123a and a first stepped part side wall 1123b, and the second stepped part 1124 includes a second stepped part bottom wall 1124a and a second stepped part side wall 1124b. The lower end opening 152 of the sleeve 15 is abutted against the first stepped part bottom wall 1123a and welded and fixed, and the lower end surface of the engaging part 16 is abutted against the second stepped part bottom wall 1124a and welded and fixed. The inner diameter of the sleeve 15 in this embodiment is slightly smaller than that of the first stepped part side wall 1123b. The sleeve 15 is shrink-fitted onto the first stepped part bottom wall 1123a and then welded and fixed. Of course, in other embodiments, the inner diameter of the sleeve 15 may be equal to or larger than the outer diameter of the first stepped part side wall (1123b). The outer diameter of the sleeve 15 in this embodiment is equal to the outer diameter of the second stepped part side wall 1124b, and the inner diameter of the engaging part 16 is equal to the outer diameter of the second stepped part side wall 1124b. Here, "equal" includes substantially equal. Such an arrangement facilitates the positioning of the engaging part 16 and the connecting part 112. Of course, in other embodiments, the inner diameter of the engaging part 16 may be larger than the outer diameter of the second stepped part side wall 1124b. A part of the lower end surface of the engaging portion 16 in the present embodiment abuts against the bottom wall 1124a of the second stepped portion, thereby restricting the lowermost position of the engaging portion 16 with respect to the connecting portion 112 during mounting.

[0020] The engaging portion 16 in the present embodiment shown in FIGS. 2, 3, and 6 is fixed and 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 receiving groove portion 34. And the receiving groove portion 34 in the present embodiment is formed at the lower end of the injection molding portion 32 and includes a receiving groove 341. At least a part of the first sealing member 41 is located in the receiving groove 341. The first sealing member 41 is in a compressed state and is clamped between the engaging portion 16 and the upper wall of the receiving groove portion 34, or is clamped between the side wall of the receiving groove portion 34 and the outer peripheral wall of the sleeve 15.

[0021] The engaging portion 16 and the connecting portion 112 in the present embodiment shown in FIGS. 2, 3, and 6 are fixed and connected by welding. An annular welding bead is formed at the welding location and is sealed by the welding bead. The receiving groove 341 includes a first opening 3411 facing the engaging portion 16 and a second opening 3412 facing the sleeve 15. The receiving groove portion 34 includes a first upper wall 342 and a first side wall 343. The upper wall of the receiving groove portion 34 includes the first upper wall 342, and the side wall of the receiving groove portion 34 includes the first side wall 343. The first upper wall 342 and the engaging portion 16 are arranged opposite to each other, and the first side wall 343 and the engaging portion 16 are arranged opposite to each other. The first sealing member 41 is in a compressed state and is clamped between the upper end surface of the engaging portion 16 and the first upper wall 342, or is clamped between the first side wall 343 and the outer peripheral wall of the sleeve 15. When the first sealing member 41 is clamped between the upper end surface of the engaging portion 16 and the first upper wall 342, it is possible to reduce the entry of external gas or liquid into 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. At this time, the first sealing member 41 is used as the first sealing location. Between the engaging portion 16 and the valve seat member 11, it is welded by a laser and welded in a circle so as to surround the connection location of the two, forming an annular welding bead by welding. The annular welding bead is used as the second sealing location. The two sealing locations act 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 electric control device provided on the top portion of the coil unit 3. For example, it prevents corrosive gas or liquid from affecting the claw pole of the coil unit 3 such as corrosion. The first side wall 343 in this embodiment is inclined by a certain angle outward from top to bottom. Of course, in other embodiments, it may be substantially vertical. When the first sealing member 41 is clamped between the first side wall 343 and the outer peripheral wall of the sleeve 15, it reduces the entry of external gas or liquid into the gap between the coil unit 3 and the sleeve 15 through the gap between the first side wall 343 and the sleeve 15. At this time, the first sealing member 41 is used as the first sealing location, and the welding bead between the engaging portion 16 and the valve seat member 11 is used as the second sealing location. By arranging the second sealing location, it further prevents 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 electric control device provided on the top portion of the coil unit 3. For example, it can prevent corrosive gas or liquid from affecting the claw pole of the coil unit 3 such as corrosion.

[0022] In other embodiments of the present embodiment shown in FIGS. 2, 3, 6, and 7, the engaging portion 16 and the connecting portion 112 are fixed and connected by welding. An annular welding bead is formed at the welding location and sealed by the welding bead. The receiving groove 341 is provided with a first opening 3411 facing the engaging portion 16. The receiving groove portion 34 includes a first upper wall 342, a first side wall 343, and a second side wall 344. And the upper wall of the receiving groove portion 34 includes the first upper wall 342, the side walls of the receiving groove portion 34 include the first side wall 343 and the second side wall 344. The first upper wall 342 is disposed opposite to the engaging portion 16, and the first side wall 343 and the second side wall 344 are disposed opposite to each other. 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 clamped between the upper end surface of the engaging portion 16 and the first upper wall 342. By arranging the first sealing member 41, it is possible to reduce the entry of external gas or liquid into 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. At this time, the first sealing member 41 is used as the first sealing location, and the area between the engaging portion 16 and the valve seat member 11 is welded by a laser and welded in a circle so as to surround the connection location of both, forming an annular welding bead by the welding. The annular welding bead is used as the second sealing location. The two sealing locations act 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 electric control device provided at the top of the coil unit 3. For example, it is possible to prevent corrosive gas or liquid from affecting the corrosion of the claw pole of the coil unit 3.

[0023] The nut unit 14 in the present embodiment shown in FIGS. 2, 9, and 10 is fixedly connected to the connecting portion 112. At least a part of the nut unit 14 is located in the valve chamber 115, and at least a part of the valve body unit 13 is located in the valve chamber 115. The nut unit 14 includes a hollow cylindrical guide portion 141. The guide portion 141 includes a storage chamber 1411. The lower end portion 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 peripheral wall of the guide portion 141. At least a part of the valve body unit 13 is located in the storage chamber 1411, and at least a part of the valve body unit 13 is slidably engaged with the guide wall segment 1412. The guide wall segment 1412 provides guidance to the valve body unit 13 and improves the coaxiality of the valve body unit 13.

[0024] The nut unit 14 in the present embodiment shown in FIGS. 2, 9, and 10 further includes a substantially cylindrical support portion 144. The outer wall of the support portion 144 is abutted and engaged with, or clearance-fitted to, the inner wall of the connection portion 112, providing support or a certain mounting guide for the nut unit 14.

[0025] In the present embodiment shown in FIGS. 2 to 5 and 10, the inner diameter of the connection 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 mounting 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 connection 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 peripheral wall of the valve body chamber 21, and the third sealing member 43 is tightened between the communication portion 113 and the inner peripheral 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 communicates directly with the valve chamber 115 through the first passage 1131. When the valve port 1112 is opened, the valve chamber 115 communicates with the second flow passage 24 through the valve port 1112. The nut unit 14 in the present embodiment is fixed and connected to the metal connection piece 14. The nut unit 14 is fixed and connected to the valve seat member 11 by the metal connection piece 142. The metal connection piece 142 is provided with a balance hole 1421 (see FIG. 8). The valve chamber 115 communicates with the chamber where the rotor unit 12 is located through the balance hole 1421, thereby balancing the pressures in the two chambers and reducing the opening pressure. Of course, in other embodiments, balance holes may be opened in the radial direction of the nut unit. In the valve seat member 11 of the present embodiment, concave grooves for accommodating the second sealing member 42 and the third sealing member 43 are respectively provided. The embodiment of the present invention further provides a manufacturing method. This manufacturing method is applicable to the manufacturing method of the above electric valve, and includes the steps of taking the base material of the valve seat member 11, processing and forming the main body portion of the valve seat member 11 by a tension process, and processing and forming the valve port portion 1111 by a cutting method. The manufacturing method provided by this embodiment reduces the material consumption and energy consumption in the processing of the valve seat member 11.

[0026] The electric valve 100 in the second embodiment shown in FIGS. 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 so as to be position-limited. The valve body unit 13 includes a screw rod portion 131. The screw rod portion 131 is provided with a first male thread 1311. In the drawing, the specific shape of the first male thread is not shown, only the position of the first male thread 1311 is shown. The nut unit 14 is provided with a first female thread 143 that engages with the first male thread 1311. The first male thread 1311 and the first female thread 143 mesh with each other to form a screw feed mechanism. The electric valve 100 further includes a restoring elastic member 5. The first end portion 51 of the restoring elastic member 5 is directly or indirectly in contact with the nut unit 14. The valve body unit 13 includes a first stopper portion 132. The second end portion 52 of the restoring elastic member 5 is in contact with the first stopper portion 132. The first end portion 51 of the restoring elastic member 5 approaches the second end portion 52 with respect to the rotor unit 12. Along the axial direction of the electric valve 100, the restoring elastic member 5 is provided closer to the bottom with respect to the first female thread 143. Such an arrangement simplifies the structure of the electric valve and reduces the number of members related to the stop structure.

[0027] In this embodiment, during the upward movement process of the screw rod portion 131, at least when the first male thread 1311 is disengaged from the first female thread 143, the restoring elastic member 5 is in a compressed state. With such an arrangement, in a state where 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 reconstitute a screw feed mechanism, converting the rotation of the rotor unit 12 into a downward axial linear motion of the screw rod portion 131 with respect to the nut unit 14. With such an arrangement, after the first male screw 1311 is disengaged from the first female screw 143, it is prevented from being unable to mesh again, and the structure of the electric valve is simplified, reducing the number of members related to the stop structure. The restoring elastic member 5 includes a spring, elastic plastic, or a structure similar to a spring function.

[0028] In another embodiment of the present embodiment, in a state where the first male screw 1311 and the first female screw 143 are engaged, the restoring elastic member 5 is in a compressed state. Here, the engagement includes partial engagement, that is, there is a situation where the first male screw 1311 and the first female screw 143 are partially engaged. With such an arrangement, the restoring elastic member 5 provides a preload force, causing the first male screw 1311 to clamp the first female screw 143, removing the screw gap between the two, tightly engaging the two, avoiding the shaking of the screw rod portion 131, and reducing noise. The above two embodiments may be used in combination or individually.

[0029] The nut unit 14 in the present embodiment shown in FIGS. 2, 8 to 11, and 13 to 14 includes a first portion 61 and a second portion 62. With respect to the second portion 62, the first portion 61 is provided closer to the top. The first portion 61 is substantially a hollow cylindrical shape, and the second portion 62 is substantially a hollow cylindrical shape. The first portion 61 includes a first chamber portion 611, and the second portion 62 includes a second chamber portion 621. And the inner wall of the first part 61 forms the first chamber part 611, the inner wall of the second chamber part 621 forms the second chamber part 621. The inner diameter of the first chamber part 611 is smaller than that of the second chamber part 621. The first chamber part 611 includes the first chamber 6111, the second chamber part 621 includes the second chamber 6211, and the first chamber 6111 communicates with the second chamber 6211.

[0030] In the present embodiment shown in FIGS. 2, 8 to 11, and 13 to 15, the first part 61 includes a first rotation stopper 612. And this first rotation stopper 612 is located at the upper end of the first part 61 and is provided so as to protrude upward from the upper surface of the first part 61. Below the first rotation stopper 612 in the present embodiment, a reinforcing part 613 is further provided. And the reinforcing part 613 improves the strength of the first rotation stopper 612. Of course, in other embodiments, the reinforcing part 613 may not be provided. The first rotation stopper 612 and the first part 61 in the present embodiment are integrally formed, which is convenient for processing. In other embodiments, they may be formed separately and then fixedly connected. Furthermore, the rotor unit 12 is provided with a second rotation stopper 121. And this rotor unit 12 includes a magnetic rotor 122 and a connection plate 123. The magnetic rotor 122 is fixedly connected to the connection plate 123 by injection molding. The screw rod part 131 is fixedly connected to the connection plate 123. The fixing connection methods include welding and riveting. The second rotation stopper 121 is formed on the connection plate 123 and is located at the lower end of the connection plate 123. The second rotation stopper 121 is provided so as to protrude downward from the lower surface of the connection plate. The second rotation stopper 121 abuts against the first rotation stopper 612 to limit the lowermost position of the rotor unit 12. Thereby, after the valve port 1112 is closed, the valve body unit 13 continues to friction or move with the valve port part 1111 to close the valve. The abutting part includes side abutting, and upper and lower surface abutting. The abutting method in the present embodiment is side abutting, that is, circumferential abutting. The two surfaces in contact with each other in this embodiment are both substantially perpendicular surfaces, and the first rotation stopper 612 and / or the second rotation stopper 121 in this embodiment has a slope. And this slope is not the surface when the sides of both are in contact and position-limited. For example, the slope on the second rotation stopper 121 is located on the opposite side of the surface that is position-limited and in contact. By arranging the slope, during valve opening, when the rotor is rotating upward, interference occurs between the two rotation stoppers, and interference occurs between the two rotation stoppers during the first revolution in the valve opening direction, preventing the valve from being unable to open.

[0031] The first chamber portion 611 in this embodiment shown in FIGS. 2, 8 to 11, and 13 to 14 includes a female screw segment 6112, the first female screw 143 is located in the female screw segment 6112, and the first chamber portion 611 further includes an internal guide segment 6113. And with respect to this internal guide segment 6113, the female screw segment 6112 approaches the connection plate 123, the inner diameter of the internal guide segment 6113 is larger than the inner diameter of the female screw segment 6112, and the screw rod portion 131 includes a male screw segment 1312 and an external guide segment 1313. The first male screw 1311 is located in the male screw segment 1312. With respect to the external guide segment 1313, the male screw segment 1312 approaches the connection plate 123, and the external guide segment 1313 is slidably engaged with the internal guide segment 6113. This internal guide segment 6113 provides guidance for the screw rod portion 131. And the screw rod portion 131 further includes a small diameter portion 1314. This small diameter portion 1314 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 arranging the small diameter portion 1314, the screw rod portion 131 is attached to the nut unit 14 from bottom to top, avoiding interference.

[0032] With such an arrangement shown in the drawings, the stop structure of the electric valve is simplified, the structure is simpler, and the members of the electric valve are reduced.

[0033] Referring to FIG. 11, the nut unit 14 in the present embodiment shown in FIGS. 2 and 8 to 10 includes a rotary connection portion 63. And this rotary connection portion 63 connects the first portion 61 and the second portion 62, has a first support surface 631 located above the second chamber 6211, and the first end portion 51 of the elastic member 5 for restoration is abutted against the first support surface 631.

[0034] Referring to FIG. 12, in another embodiment of the present embodiment shown in FIGS. 2 and 8 to 10, the electric valve further includes a support gasket 632. And the lower end surface of this support gasket 632 is abutted against the elastic member 5 for restoration, the upper end surface of the support gasket 632 is abutted against the first support surface 631, and by arranging the support gasket 632, the processing difficulty of the nut unit 14 is reduced, and the elastic member 5 for restoration is prevented from tilting due to the engaging surface between the nut unit 14 and the first end portion 51 of the elastic member 5 for restoration not being flat.

[0035] The valve body unit 13 in the present embodiment shown in FIGS. 2 and 8 to 11 and FIGS. 13 to 14 further includes a valve body portion 133 connected so as to be position-limited to the screw rod portion 131. The top portion of the valve body portion 133 is used as the first stopper portion 132, and the second end portion 52 of the elastic member 5 for restoration is abutted against the top portion of the valve body portion 133.

[0036] The valve body portion 133 in the present embodiment shown in FIGS. 2 and 8 to 11 and FIGS. 13 to 14 includes a valve body cover 1331, a valve needle portion 1332, and a position-limiting block 1333. This position-limiting block 1333 has a first hole 1334, a part of the screw rod portion 131 is located in the first hole 1334, a part of the screw rod portion 131 extends to the 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. This flange portion 1315 is fixed and connected to the screw rod portion 131 or integrally formed. 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 within the position limiting block 1333 and has a tip surface. The second end portion 52 of the elastic member 5 for restoration 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. By making the tip surface of the position limiting block 1333 flat, it prevents the second end portion 52 of the elastic member 5 for restoration from tilting. The elastic member 5 for restoration is externally fitted onto the screw rod portion 131. The inner diameter of this elastic member 5 for restoration 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 certain guide for the elastic member 5 for restoration, preventing the elastic member 5 for restoration from tilting. In other embodiments, the valve body portion 133 and the screw rod portion 131 are integrally formed, and the valve body portion 133 is provided on the screw rod portion 131. Such an arrangement reduces the development cost of the electric valve. In another embodiment of this embodiment, an annular support piece (not shown in the figure) is provided at the top portion of the valve body portion 133. The lower end surface of the support piece abuts against the top portion of the valve body portion 133, and the second end portion 52 of the elastic member 5 for restoration abuts against the upper end surface of the support piece.

[0037] In another embodiment of this embodiment, the first stopper portion 132 includes a locking spring (not shown in the figure) and a gasket (not shown in the figure). The locking spring is locked and fixed to the screw rod portion 131. With respect to the elastic member 5 for restoration, the locking spring and the gasket are provided closer to the bottom. The second end portion 52 of the elastic member 5 for restoration abuts against the upper surface of the gasket, the lower surface of the gasket abuts against the locking spring, and in a state where at least the first male screw 1311 is disengaged from the first female screw 143, the elastic member 5 for restoration is in a compressed state. The stopper portion in another embodiment includes a gasket (not shown). With respect to the elastic member 5 for restoration, the gasket is provided closer to the bottom. The gasket is welded and fixed to the screw rod portion 131. The second end portion 52 of the elastic member 5 for restoration abuts against the lower surface of the gasket. In a state where at least the first male screw 1311 is disengaged from the first female screw 143, the elastic member 5 for restoration is in a compressed state.

[0038] The first male screw 1311 of the screw rod portion 131 and the first female screw 143 of the nut unit 14 are screwed together. When the rotor unit 12 moves upward, the rotor unit 12 rotates to rotate the screw rod portion 131. Thereby, the rotation of the rotor unit 12 is converted into an upward axial movement of the screw rod portion 131 with respect to the nut unit 14, and the screw rod portion 131 is moved upward. After the first male screw 1311 is disengaged from the first female screw 143, if the screw rod portion 131 does not continue to move upward and needs to close the valve port 1112, since the elastic member 5 for restoration is always in a compressed state, the screw rod portion 131 always receives a downward elastic force. Thereby, the engagement between the first male screw 1311 and the first female screw 143 is restored, and the rotation of the rotor unit 12 is converted into a downward axial movement of the screw rod portion 131 with respect to the nut unit 14. In this embodiment, the function can be realized with a simple structure.

[0039] Here, the above embodiments do not limit the present invention, but are merely for explaining the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, those skilled in the art can make corrections or equivalent substitutions to the present invention. All improvements that do not deviate from the spirit and scope of the present invention are within the scope of the present invention.

Claims

1. A valve device including a valve seat member (11) and a valve body unit (13), wherein 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 integrally formed by a drawing process, the valve seat portion (111) includes a valve port portion (1111), the valve port portion (1111) is provided with a valve port (1112), the valve body unit (13) includes a valve body portion (133), and the valve body portion (133) is operable with respect to the valve port (1112) and adjusts the flow area of the valve port (1112). A valve device characterized by this.

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 of an integral structure, the communication portion (113) is provided with a first passage (1131), the valve device includes a valve chamber (115), the wall forming the valve chamber (115) includes the inner peripheral wall of the valve seat member (11), the valve body portion (133) of the valve body unit (13) is operable within the valve chamber (115), and the first passage (1131) communicates with the valve chamber (115). The valve device according to claim 1, characterized by this.

3. The valve seat portion (111) is located at the lower end of the communication portion (113) and extends inward with respect to the communication portion (113), the valve port (1112) penetrates the valve seat portion (111) along the axial direction of the valve device, the valve body unit (13) and the valve port portion (1111) are coaxially arranged, the valve port portion (1111) is provided with a valve port engaging portion (1113), The valve device according to claim 2, wherein 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 device includes a valve body (2), The valve body (2) includes a valve body chamber (21), At least a part of the valve seat member (11) is located in the valve body chamber (21), The valve body (2) includes an internal thread portion (22) located on the inner peripheral wall forming the valve body chamber (21), The connection portion (112) includes an external thread portion (1121) that engages with the internal thread 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 an external thread portion that engages with the internal thread portion, The valve device according to any one of claims 1 to 3, wherein the annular member and the valve body (2) are connected by a screw, and the valve seat member (11) is clamped 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) fixed to 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) have a separate structure, The engaging portion (16) is fixed to and connected to the connection portion (112) and covers the connection location between the sleeve (15) and the connection portion (112), The valve device according to claim 4, wherein the engaging portion (16) includes several engaging edges (161) distributed on the outer peripheral wall of the engaging portion (16).

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

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

8. The engaging portion (16) and the connecting portion (112) are fixedly connected by welding, At the welding location, an annular welding bead is formed and sealed by the welding bead. The receiving groove (341) has a first opening (3411) facing the engaging portion (16). The receiving groove portion (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 to each other. The first side wall (343) and the second side wall (344) are arranged opposite to 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, wherein the first sealing member (41) is in a compressed state and is clamped between the upper end surface of the engaging portion (16) and the first upper wall (342).

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

10. The valve seat member (11) includes a nut unit (14) that is fixed and connected to the connection portion (112). At least a part of the nut unit (14) is located in the valve chamber (115). At least a part of the valve body unit (13) is located in the valve chamber (115). The nut unit (14) includes a hollow cylindrical guide portion (141). The guide portion (141) includes a storage chamber (1411), and the lower end portion 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 peripheral wall of the guide portion (141). At least a part 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, wherein at least a part 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 outer wall of the support portion (144) is abutted and engaged with or clearance-fitted to the inner wall of the connection portion (112) to provide support or a certain mounting guide for the nut unit (14). The valve device according to claim 10.

12. The valve seat member (11) further includes a transition portion (114) located between the connection portion (112) and the communication portion (113). The inner diameter of the connection 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) positioned between the first passage (1131) and the connection portion (112), and a third sealing member (43) positioned between the first passage (1131) and the valve seat portion (111). The second sealing member (42) is clamped between the transition portion (114) and the inner peripheral wall forming the valve body chamber (21). The valve device according to claim 10, wherein the third sealing member (43) is clamped between the communication portion (113) and the inner peripheral wall forming the valve body chamber (21).

13. A manufacturing method, wherein the manufacturing method is applied to the manufacture of the electric valve according to any one of claims 1 to 12. The step of taking the base material of the valve seat member (11). The step of forming the main body portion of the valve seat member (11) by a drawing process. The manufacturing method characterized by including the step of forming the valve port portion (1111) by machining.

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