Valve gear and motor-operated valve

Abstract

Disclosed is a valve device, in which the valve seat member includes a valve seat cover and a flange portion, a lower end opening of the sleeve is welded and fixed to the valve seat cover, the valve device further includes a mounting block, by which the valve device is attached to another member, the mounting block further includes a mounting hole, a portion of the valve seat member is located in the mounting hole, a hole diameter of at least a portion of the mounting hole is smaller than an outer diameter of the flange portion, the flange portion limits the mounting block from being separated from the valve seat member in a direction away from the coil unit, the valve device further includes a pad, at least a portion of the pad is located between the valve seat member and an inner circumferential wall surrounding the mounting hole, the pad is fastened between the mounting block and the valve seat member so as to be tightly fitted, limiting circumferential rotation of the valve seat member relative to the mounting block, and by arranging in this manner, circumferential rotation of the valve member relative to the mounting block or the valve body is limited, facilitating installation of the valve device.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on January 27, 2022, bearing application number 202210102507.2 and entitled "Valve Mechanism and Motor-Operated Valve", the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of fluid control, and more particularly to a valve device and a motorized valve having the valve device. [Background technology]

[0003] The motor-operated valve includes a valve member, a mounting block, and a valve body. The valve member and the mounting block are separate structures. The mounting block has a through hole. A bolt unit passes through the through hole and is screwed into a screw hole on the valve body to fix the mounting block to the valve body. The mounting block abuts against the valve member, restricting the axial position of the valve member. However, this arrangement cannot prevent the valve member from rotating in the circumferential direction relative to the mounting block or the valve body. Therefore, how to reliably fix the valve member to the mounting block or the valve body is a technical issue that should be considered by those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT APPLICATION It is an object of the present application to provide a valve assembly and motorized valve that limits circumferential rotation of a valve member relative to a mounting block or valve body to facilitate mounting of the valve assembly. [Means for solving the problem]

[0005] In order to achieve the above objectives, the present application adopts the following technical solutions: A valve device, the valve device comprising: a coil unit; and a valve member, the valve member comprising a valve seat member, a rotor member, a valve body member and a sleeve, the coil unit comprising a stator unit, the stator unit rotatable the rotor member, the valve body member connected to the rotor member, the rotor member axially moving the valve body member relative to the valve seat member, the valve seat member includes a valve seat cover and a flange portion, and a lower end opening of the sleeve is welded and fixed to the valve seat cover; the valve device further includes a mounting block for mounting the valve device to another member, the mounting block further includes a mounting hole, a portion of the valve seat member is located in the mounting hole, and a hole diameter of at least a portion of the mounting hole is smaller than an outer diameter of the flange portion, and the flange portion limits the mounting block from separating from the valve seat member in a direction away from the coil unit; the valve device further includes a pad, at least a portion of the pad is located between the valve seat member and an inner circumferential wall forming the mounting hole, and the pad is fastened between the mounting block and the valve seat member so as to be tightly fitted, thereby limiting circumferential rotation of the valve seat member relative to the mounting block.

[0006] An electric valve, the electric valve including the valve device and a valve body, the valve body having a valve body chamber, a part of the valve device being located in the valve body chamber, the mounting block having a second communicating hole, the valve body having a second screw hole, the electric valve further including a second bolt unit, the second bolt unit being screwed through the second communicating hole into the second screw hole in the valve body, a lower end surface of the flange portion being abutted against the valve body, and the mounting block being abutted against an upper end surface of the flange portion, thereby fixing the valve device to the valve body. Effect of the Invention

[0007] In an embodiment provided by the present application, the valve seat member includes a valve seat cover and a flange portion, and the lower end opening of the sleeve is welded and fixed to the valve seat cover; the valve device further includes a mounting block, which is used to mount the valve device to another member; the mounting block further includes a mounting hole, a portion of the valve seat member is located in the mounting hole, and the hole diameter of at least a portion of the mounting hole is smaller than the outer diameter of the flange portion, and the flange portion restricts the mounting block from being separated from the valve seat member in a direction away from the coil unit; the valve device further includes a pad, at least a portion of which is located between the valve seat member and an inner peripheral wall forming the mounting hole, and the pad is clamped between the mounting block and the valve seat member so as to be tightly fitted, restricting circumferential rotation of the valve seat member relative to the mounting block; and by arranging in this manner, the circumferential rotation of the valve member relative to the mounting block or the valve body is restricted, thereby facilitating installation of the valve device. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a schematic diagram of the three-dimensional structure of the first embodiment of the valve device provided by the present application from one viewing angle; [Diagram 2] FIG. 2 is a schematic diagram of the front structure of the valve device of FIG. [Diagram 3] 3 is a schematic cross-sectional view of the valve device of FIG. 2 taken along the plane AA. [Figure 4] FIG. 4 is an enlarged schematic diagram of the structure of part A in FIG. [Diagram 5] FIG. 2 is a schematic diagram of the front structure of the coil unit in FIG. [Figure 6] 6 is a schematic diagram of a cross-sectional structure of the coil unit of FIG. 5 taken along the plane BB. [Figure 7] FIG. 2 is a schematic diagram of the front structure of the valve member of FIG. [Figure 8] 8 is a schematic cross-sectional view of the valve member of FIG. 7 taken along plane CC. [Figure 9] FIG. 2 is a schematic diagram of the three-dimensional structure of the mounting block of FIG. 1 from one viewing angle. [Figure 10] 10 is a schematic cross-sectional view of the mounting block of FIG. 9 from one viewing angle. FIG. [Figure 11]FIG. 2 is a schematic diagram of the structure of the pad of FIG. 1 from one viewing angle. [Figure 12] 12 is a schematic diagram of the cross-sectional structure of the pad in FIG. 11 from one viewing angle. [Figure 13] FIG. 2 is a cross-sectional structural schematic diagram of a second embodiment of a valve device provided by the present application from one viewing angle; [Figure 14] FIG. 14 is a schematic diagram of the three-dimensional structure of the mounting block of FIG. 13 from one viewing angle. [Figure 15] 15 is a schematic cross-sectional view of the mounting block of FIG. 14 from one viewing angle. FIG. [Figure 16] FIG. 14 is a schematic diagram of the three-dimensional structure of the pad in FIG. 13 from one viewing angle. [Figure 17] FIG. 11 is a cross-sectional structural schematic diagram of a third embodiment of a valve device provided by the present application from one viewing angle; [Figure 18] FIG. 18 is a schematic diagram of the structure of the pad of FIG. 17 from one viewing angle. [Figure 19] 19 is a schematic diagram of the cross-sectional structure of the pad in FIG. 18 from one viewing angle. [Figure 20] FIG. 2 is a schematic diagram of the three-dimensional structure of one embodiment of the motor-operated valve provided by the present application. [Figure 21] FIG. 21 is a schematic diagram of the front structure of the motor-operated valve of FIG. 20. [Figure 22] 21 is a schematic diagram of a cross-sectional structure of the motor-operated valve of FIG. 20 taken along the DD plane. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will be further described below in conjunction with the drawings and specific examples.

[0010] 1 to 8 and 22 are combined to show an embodiment of a valve device 100, which can be attached to other members, such as a valve body 101 and a heat exchange core, and which includes a coil unit 1 and a valve member 2. The coil unit 1 includes a stator unit 11 and an injection molded part 12, which covers at least a part of the stator unit 11, and the coil unit 1 includes a housing chamber 13 having an open lower end. The valve member 2 includes a valve seat member 21, a rotor member 22, a valve body member 23, a nut unit 24 and a sleeve 25, at least a portion of the sleeve 25 is located in the accommodating chamber 13, the sleeve 25 includes a sleeve top portion 251 and a lower end opening 252, the lower end opening 252 of the sleeve 25 is welded and fixed to the valve seat member 21, the stator unit 11 is located outside the sleeve 25, and the rotor member 22 is located inside the sleeve 25, by passing a predetermined current through the stator unit 11, an excitation magnetic field is generated to rotate the rotor member 22, the valve body member 23 is connected to the rotor member 22, the rotor member 22 rotates the valve body member 23, and the valve body member 23 is threadedly engaged with the nut unit 24, thereby converting the rotation of the rotor member 22 into an axial movement of the valve body member 23 relative to the valve seat member 21.

[0011] 3 and 8, the valve seat member 21 includes a valve seat portion 211 and a valve socket portion 212, the valve seat portion 211 and the valve socket portion 212 are molded separately and fixedly connected, the fixed connection method includes welding, crimping, etc. In another embodiment, the valve seat portion 211 and the valve socket portion 212 may be molded as a single unit. The valve socket portion 212 is formed with a valve port 2121, and the valve body member 23 has a valve needle portion 231, which opens or closes the valve port 2121 or adjusts the flow area of ​​the valve port 2121, and further adjusts the flow rate passing through the valve port 2121.

[0012] Combining Figures 3 and 8, the valve seat portion 211 includes a valve seat cover 2111 and a flange portion 2112, and the outer diameter of the flange portion 2112 is larger than the outer diameter of the valve seat cover 2111. The lower end opening 252 of the sleeve 25 and the valve seat cover 2111 are fixed by welding to form a first weld seam 2113.

[0013] Combining Figures 3 to 10 and Figure 22, the valve device 100 further includes a mounting block 3 for mounting the valve device 100 to other members, the other members including the valve body 101, the heat exchange core, etc., the mounting block 3 has a mounting hole 31, a part of the valve seat member 21 is located in the mounting hole 31, the hole diameter of at least a part of the mounting hole 31 is smaller than the outer diameter of the flange portion 2112, the flange portion 2112 restricts the mounting block 3 from coming off the valve seat member 21 in a direction away from the coil unit 1, the valve device 100 further includes a pad 4, at least a part of the pad 4 is located between the valve seat member 21 and the inner circumferential wall forming the mounting hole 31, and the pad 4 is fastened between the mounting block 3 and the valve seat member 21 so as to be tightly fitted, restricting circumferential rotation of the valve seat member 21 relative to the mounting block 3, and further restricting circumferential rotation of the valve member 2 relative to the mounting block 3. By arranging them in this manner, circumferential rotation and axial movement of the valve seat member 21 or the valve member 2 relative to the mounting block 3 is restricted; by assembling the valve device 100 as an independent whole, the valve device 100 can be easily transported; and by fixing the valve device 100 as a whole to other members such as the valve body 101 and the heat exchange core, mounting efficiency is improved; and after mounting, the valve member 2 cannot rotate circumferentially relative to the valve body 101 or the heat exchange core, and the positions of each component are fixed relative to one another, thereby improving the reliability of the valve device 100.

[0014] Combining Figures 3 to 12, in a first embodiment of the valve device 100, a portion of the valve seat portion 211 is located in the mounting hole 31, the pad 4 has an annular cylindrical shape and includes a first pad portion 41 and a second pad portion 42, the outer diameter of the first pad portion 41 is larger than the outer diameter of the second pad portion 42, the first pad portion 41 is relatively close to the coil unit 1, the second pad portion 42 is fitted between the mounting block 3 and the valve seat member 21 so as to be tightly fitted, and the inner surface of the second pad portion 42 contacts the outer surface of the valve seat cover 2111 and contacts the inner wall forming the mounting hole 31. Specifically, in this embodiment, the hole diameters of the mounting hole 31 along the axial direction are different, which are a middle hole diameter, a small hole diameter and a large hole diameter from top to bottom, and the mounting hole wall 311 forming the mounting hole 31 includes a first side wall 3111, a second side wall and a third side wall, the middle hole diameter corresponds to the first side wall 3111, the small hole diameter corresponds to the second side wall 3112, and the large hole diameter corresponds to the third side wall 3113. The second pad portion 42 is inserted between the first side wall 3111 and the valve seat cover 2111 in a tight fit, and the outer circumferential surface of the second pad portion 42 contacts the first side wall 3111 and the inner circumferential surface of the second pad portion 42 contacts the outer circumferential surface of the valve seat cover 2111 to restrict the circumferential rotation of the valve member 2 relative to the mounting block 3. Of course, in other embodiments, the mounting hole 31 does not need to have a small hole diameter, and the small hole diameter is changed to be the same as the intermediate hole diameter, and the first side wall 3111 and the second side wall 3112 are on the same plane. In this embodiment, the mounting block 3 includes a first surface 32 and a second surface 33, the first surface 32 is the upper end surface of the mounting block 3, the second surface 33 is the lower end surface of the mounting block 3, and the lower end surface of the part of the first pad portion 41 protruding from the second pad portion 42 abuts against the first surface 32 of the mounting block 3, which limits the relative position between the pad 4 and the mounting block 3 and prevents excessive press-in when the pad 4 is tightly fitted.

[0015] 3 to 12, in this embodiment, the lower end of the mounting block 3 is provided with a recess 34, and the hole diameter of the side wall forming the recess 34 is larger than the minimum hole diameter of the mounting hole 31. In this embodiment, the third side wall 3113 constitutes the side wall of the recess 34, at least a part of the flange portion 2112 is located in the recess 34, and the upper wall forming the recess 34 abuts against the upper end surface of the flange portion 2112, and the flange portion 2112 restricts the mounting block 3 from being detached from the valve seat member 21 in the direction away from the coil unit 1, and further restricts the mounting block 3 from being detached from the valve member 2 in the direction away from the coil unit 1. Of course, in other embodiments, the third side wall 3113, i.e., the recess 34, may not be provided, and the lower end surface of the mounting block 3 is flat and abuts against the upper end surface of the flange portion 2112. The recess 34 is arranged to ensure the connection strength of the mounting block 3, and the height of the mounting block 3 or the height of the valve seat member 21 is reduced to save material.

[0016] Combining Figures 3 to 12, in this embodiment, the valve device 100 further includes a first sealing ring 51, and the top part of the pad 4 supports the first sealing ring 51, and the coil unit 1 further includes an injection molding part 12 covering at least a part of the stator unit 11, and the coil unit 1 includes an accommodating chamber 13 with an open lower end, and the lower end of the injection molding part 12 includes an annular groove part 121, and the annular groove part 121 includes an annular groove, and at least a part of the first sealing ring 51 is located in the annular groove, and the annular groove opens toward the sleeve 25, and the first sealing ring 51 is clamped between the inner wall of the annular groove part 121 and the sleeve 25, i.e., between the inner wall of the annular groove part 121 and the outer wall of the sleeve 25, thereby reducing the water, gas or other medium entering the gap between the coil unit 1 and the sleeve 25, and reducing the corrosion risk of the components on the coil unit 1, and extending the service life of the valve device 100.

[0017] Combining Figures 3 to 12, in this embodiment, the pad 4 covers the welded portion between the sleeve 25 and the valve seat cover 2111. Specifically, the second pad portion 42 of the pad 4 covers the first welded seam 2113 formed by welding the lower end opening 252 of the sleeve 25 and the valve seat cover 2111. The lowermost end of the pad 4 is located below the first welded seam 2113, and the uppermost end is located above the first welded seam 2113. At least a part of the inner peripheral surface of the second pad portion 42 abuts against the outer peripheral surface of the valve seat cover 2111. This arrangement reduces the contact between the first welded seam 2113 and the outside, thereby protecting the first welded seam 2113, reducing the risk of the welded seam rusting, and further reducing the water, gas or other medium entering the gap between the coil unit 1 and the sleeve 25.

[0018] 3 to 12 are combined, and in this embodiment, the valve device 100 further includes a connection member 6, which includes a main body plate portion 61 and a side plate portion 62, the main body plate portion 61 and the side plate portion 62 are of an integral structure, the side plate portion 62 is folded back from the main body plate portion 61 in a direction away from the coil unit 1, and the main body plate portion 61 is fixedly connected to the coil unit 1. In this embodiment, specifically, the main body plate portion 61 is a substantially annular plate, the lower end of the injection molded portion 12 includes several pillars 122, the main body plate portion 61 includes several first through holes, the positions of the pillars 122 and the positions of the first through holes are arranged corresponding to each other, the pillars 122 pass through the first through holes, and the portions of the pillars 122 that pass through the first through holes are welded to fix the main body plate portion 61 to the injection molded portion 12. In this embodiment, only half of the posts 122 are welded, although of course in other embodiments, all or a selected number of the posts 122 may be welded.

[0019] 3 to 12, in this embodiment, the side plate portion 62 of the connection member 6 has a first through hole 621, the mounting block 3 has a first screw hole 312, and the valve device 100 further has a first bolt unit 103, which is screwed into the first screw hole 312 on the mounting block 3 through the first through hole 621 to fixedly connect the connection member 6 to the mounting block 3. In other embodiments, the connection member 6 and the mounting block 3 may be fixedly connected by engagement, welding, adhesive bonding, etc. The upper end surface of the mounting block 3, i.e., the first surface 32, has an escape groove 35, which is disposed corresponding to the position of the columnar body 122, and a part of the columnar body 122 is accommodated in the escape groove 35, which prevents the mounting block 3 from interfering with the columnar body 122 and reduces the weight of the mounting block 3.

[0020] 13 to 16, in a second example of the valve device 100, the pad 4 of this example includes a first pad portion 41 and a second pad portion 42 in the same manner as in the first embodiment of the valve device 100, and the outer diameter of the first pad portion 41 is larger than the outer diameter of the second pad portion 42, with the difference being that the outer periphery of the second pad portion 42 is provided with a first protrusion 421 provided along the axial direction of the valve member 2, and the peripheral side wall forming the mounting hole 31 is provided with a second protrusion 422 provided along the axial direction of the valve member 2. The valve seat member 21 has one strip groove 313. Specifically, in this embodiment, the first strip groove 313 is formed on the first side wall 3111, the shape of the first protrusion 421 is matched with the inner peripheral wall forming the first strip groove 313, the first protrusion 421 is press-fitted into the inner peripheral wall forming the first strip groove 313, and the inner peripheral surface of the pad 4 is press-fitted into the outer peripheral surface of the valve seat cover 2111, thereby restricting the circumferential rotation of the valve seat member 21 relative to the mounting block 3. Of course, in other embodiments, the first protrusion 421 may have the shape of a columnar protrusion or a pyramidal protrusion. Other parts are basically the same as those of the first embodiment of the valve gear 100, so no further description is given here.

[0021] In one variation of the second embodiment, the inner surface of the pad 4 has a second convex rib arranged along the axial direction of the valve member 2, and the valve seat cover 2111 has a second strip groove arranged along the axial direction of the valve member 2, and the second convex rib is press-fitted into the inner wall forming the second strip groove, which can similarly limit the circumferential rotation of the valve seat member 21 relative to the mounting block 3.

[0022] In the third embodiment of the valve device 100, compared with the second embodiment of the valve device 100, the outer periphery of the second pad portion 42 has a third strip groove arranged along the axial direction of the valve member 2, and the peripheral side wall forming the mounting hole 31 has a third protrusion arranged along the axial direction of the valve member 2, specifically, the third protrusion is formed on the first side wall 3111, the shape of the third protrusion matches the inner periphery wall forming the third strip groove, the third protrusion is press-fitted into the inner periphery wall forming the third strip groove, and the inner periphery surface of the pad 4 is press-fitted into the outer periphery surface of the valve seat cover 2111, thereby restricting the circumferential rotation of the valve seat member 21 relative to the mounting block 3. Other parts are basically the same as those of the first embodiment of the valve device 100, so no detailed description is given here.

[0023] In one variation of the third embodiment, the inner surface of the pad 4 has a fourth strip groove arranged along the axial direction of the valve member 2, and the valve seat cover 2111 has a fourth ridge line arranged along the axial direction of the valve member 2, and the fourth ridge line is press-fitted into the inner wall forming the fourth strip groove, which can similarly limit the circumferential rotation of the valve seat member 21 relative to the mounting block 3.

[0024] Combining Figures 17 to 19, in a fourth embodiment of the valve device 100, compared to the above-mentioned valve device 100, the pad 4 of this embodiment includes a large diameter cylindrical portion 45 and a small diameter cylindrical portion 44, the small diameter cylindrical portion 44 is relatively close to the coil unit 1, a bent portion 46 is provided between the large diameter cylindrical portion 45 and the small diameter cylindrical portion 44, the lower end surface of the bent portion 46 abuts against the upper end surface of the flange portion 2112, the mounting block 3 abuts against the upper end surface of the bent portion 46, at least a part of the small diameter cylindrical portion 44 is press-fitted between the valve seat cover 2111 and the inner circumferential wall forming the mounting hole 31 by being tight-fitted, and at least a part of the large diameter cylindrical portion 45 is press-fitted between the outer circumferential surface of the flange portion 2112 and the inner circumferential wall forming the mounting hole 31 by being tight-fitted, and by being arranged in this manner, the circumferential rotation and axial movement of the valve seat member 21 relative to the mounting block 3 is restricted. The pad 4 covers the welded portion between the sleeve 25 and the valve seat cover 2111, and specifically, in this embodiment, the small diameter cylindrical portion 44 covers the first weld seam 2113 formed by welding the sleeve 25 and the valve seat cover 2111. The other parts are basically the same as those in the first embodiment of the valve gear 100, so they will not be described in detail here.

[0025] In the embodiment of the valve device 100, the connection portions between the pad 4 and the mounting block 3, or between the pad 4 and the valve member 2, may be further glued or welded to further improve the reliability of the connection, or the mounting block 3 and the valve seat portion 211 may be further glued with an adhesive, which can also further improve the reliability of the connection.

[0026] 20-22, the present invention further provides an embodiment of an electrically operated valve 200, which includes the valve device 100. The electrically operated valve includes a valve body 101, the valve body 101 includes a valve body chamber 1011, a part of the valve device 100 is located in the valve body chamber 1011, the mounting block 3 includes a second communication hole 314, the valve body 101 includes a second screw hole 1012, the electrically operated valve 200 further includes a second bolt unit 201 that passes through the second communication hole 314 and is screwed into the second screw hole 1012 in the valve body 101, the lower end surface of the flange portion 2112 abuts against the valve body 101, and the mounting block 3 abuts against the upper end surface of the flange portion 2112, thereby fixing the valve device 100 to the valve body 101, and after the valve device 100 is fixed to the valve body 101, the positions of each part are relatively fixed.

[0027] 20-22, in this embodiment, the valve body 101 includes a first flow passage 1013 and a second flow passage 1014, the first flow passage 1013 and the second flow passage 1014 are connected through the valve device 100, and the valve body member 23 and the valve port 2121 cooperate with each other to adjust the amount of the working medium passing between the first flow passage 1013 and the second flow passage 1014, and the working medium includes a refrigerant. In this embodiment, a second seal ring 52 is provided between the side wall forming the valve body chamber 1011 and the valve seat portion 211, and a third seal ring 53 is provided between the side wall forming the valve body chamber 1011 and the valve seat portion 212, and the second seal ring 52 and the third seal ring 53 are provided to prevent leakage of the working medium.

[0028] The present invention further provides an embodiment of a heat exchange device (not shown), which includes the valve device 100 and a heat exchange core, the heat exchange core has a heat exchange core chamber, a part of the valve device 100 is located in the heat exchange core chamber, the mounting block 3 has a second communication hole 314, the heat exchange core has a second screw hole, and the heat exchange core further includes a second bolt unit that passes through the second communication hole and is screwed into the second screw hole on the heat exchange core, the lower end surface of the flange portion is abutted against the heat exchange core, and the mounting block 3 abuts against the upper end surface of the flange portion 2112, thereby fixing the valve device 100 to the heat exchange core, and after the valve device 100 is fixed to the heat exchange core, the positions of each part are relatively fixed.

[0029] In this embodiment, the heat exchange core includes a first flow passage and a second flow passage, the first flow passage and the second flow passage are not connected to each other, a cooling liquid passes through the first flow passage and a refrigerant passes through the second flow passage, and the valve device 100 is attached to the heat exchange core, and the valve body member 23 and the valve port 2121 cooperate to control the amount of refrigerant passing through the second flow passage.

[0030] Here, the above examples do not limit the technical solutions described in the present invention, but are merely intended to illustrate the present invention. Although the present invention has already been described in detail in this specification with reference to the above examples, those skilled in the art may naturally make amendments or equivalent substitutions to the present invention, and any technical solutions and improvements thereon that do not deviate from the spirit and scope of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A valve device, the valve device including a coil unit and a valve member, the valve member including a valve seat member, a rotor member, a valve body member and a sleeve, the coil unit including a stator unit, the stator unit rotatable the rotor member, the valve body member being connected to the rotor member, the rotor member moving the valve body member in an axial direction relative to the valve seat member, the valve seat member including a valve seat cover and a flange portion, a lower end opening of the sleeve is welded and fixed to the valve seat cover, the valve device further including an attachment block for attaching the valve device to another member, and the attachment the mounting block further includes a mounting hole, a portion of the valve seat member is located in the mounting hole, a diameter of at least a portion of the mounting hole is smaller than an outer diameter of the flange portion, the flange portion limits the mounting block from coming off the valve seat member in a direction away from the coil unit, the valve device further includes a pad, at least a portion of the pad is located between the valve seat member and an inner circumferential wall forming the mounting hole, the pad is fastened between the mounting block and the valve seat member so as to be tightly fitted, the valve device limits circumferential rotation of the valve seat member relative to the mounting block.

2. 2. The valve device according to claim 1, wherein the pad has an annular cylindrical shape and includes a first pad portion and a second pad portion, the outer diameter of the first pad portion is larger than the outer diameter of the second pad portion, the first pad portion is relatively close to the coil unit, and the second pad portion is fitted between the mounting block and the valve seat member so as to be tightly fitted therewith, and the inner circumferential surface of the second pad portion contacts the outer circumferential surface of the valve seat cover and contacts the inner circumferential wall forming the mounting hole.

3. 2. The valve device according to claim 1, wherein the pad has an annular cylindrical shape and includes a first pad portion and a second pad portion, an outer diameter of the first pad portion is larger than an outer diameter of the second pad portion, the first pad portion is relatively close to the coil unit, a part of the second pad portion is located between the valve seat member and the mounting block, an outer periphery of the second pad portion has a first protrusion extending along the axial direction of the valve member, a peripheral side wall forming the mounting hole has a first strip groove extending along the axial direction of the valve member, a shape of the first protrusion corresponds to an inner periphery wall forming the first strip groove, the first protrusion is press-fitted into the inner periphery wall forming the first strip groove, an inner periphery surface of the pad is press-fitted into an outer periphery surface of the valve seat cover, or an inner periphery surface of the pad has a second protrusion extending along the axial direction of the valve member, the valve seat cover has a second strip groove extending along the axial direction of the valve member, and the second protrusion is press-fitted into the inner periphery wall forming the second strip groove.

4. 2. The valve device according to claim 1, wherein the pad has an annular cylindrical shape and includes a first pad portion and a second pad portion, an outer diameter of the first pad portion is larger than an outer diameter of the second pad portion, the first pad portion is relatively close to the coil unit, a part of the second pad portion is located between the valve seat member and the mounting block, an outer periphery of the second pad portion has a third strip groove provided along the axial direction of the valve member, a peripheral side wall forming the mounting hole has a third ridge provided along the axial direction of the valve member, a shape of the third ridge matches an inner circumferential wall forming the third strip groove, the third ridge is press-fitted into the inner circumferential wall forming the third strip groove, an inner circumferential surface of the pad is press-fitted into an outer circumferential surface of the valve seat cover, or an inner circumferential surface of the pad has a fourth strip groove provided along the axial direction of the valve member, the valve seat cover has a fourth ridge provided along the axial direction of the valve member, and the fourth ridge is press-fitted into the inner circumferential wall forming the fourth strip groove.

5. 5. A valve device as claimed in any one of claims 2 to 4, characterized in that a lower end of the mounting block is provided with a recess, a diameter of a side wall forming the recess is larger than the minimum diameter of the mounting hole, at least a part of the flange portion is located in the recess, an upper wall forming the recess is abutted against the flange portion, a lower end surface of a portion of the first pad portion protruding from the second pad portion is abutted against an upper end surface of the mounting block, limiting the relative position of the pad and the mounting block, and the pad covers a welded portion between the sleeve and the valve seat cover.

6. 2. The valve device according to claim 1, wherein the pad includes a large diameter cylindrical portion and a small diameter cylindrical portion, the small diameter cylindrical portion is relatively close to the coil unit, there is a bent portion between the large diameter cylindrical portion and the small diameter cylindrical portion, a lower end surface of the bent portion abuts against an upper end surface of the flange portion, the mounting block abuts against the upper end surface of the bent portion, at least a portion of the small diameter cylindrical portion is press-fitted between the valve seat cover and an inner circumferential wall that forms the mounting hole, and at least a portion of the large diameter cylindrical portion is press-fitted between an outer circumferential surface of the flange portion and the inner circumferential wall that forms the mounting hole, and the pad covers a welded portion between the sleeve and the valve seat cover.

7. The valve device according to any one of claims 2 to 6, characterized in that the valve device includes a first sealing ring, a top portion of the pad supports the first sealing ring, the coil unit further includes an injection-molded part covering at least a portion of the stator unit, a lower end of the injection-molded part has an annular groove portion, the annular groove portion has an annular groove, the annular groove opens toward the sleeve, at least a portion of the first sealing ring is located in the annular groove, and the first sealing ring is clamped between an inner wall of the annular groove portion and the sleeve.

8. The valve device described in claim 7, further comprising a connecting member, the connecting member including a main body plate portion and a side plate portion, the main body plate portion and the side plate portion being of integral structure, the main body plate portion being fixedly connected to the coil unit, the side plate portion being folded back from the main body plate portion in a direction away from the coil unit, the side plate portion having a first communicating hole, the mounting block having a first screw hole, the valve device further comprising a first bolt unit, the first bolt unit being screwed through the first communicating hole into the first screw hole in the mounting block, thereby fixedly connecting the connecting member to the mounting block.

9. 9. The valve device according to claim 8, characterized in that a lower end of the injection molded part has a pillar-shaped body, the main body plate part has a first through hole, the pillar-shaped body passes through the first through hole, and the main body plate part is fixed to the injection molded part by welding the part that passes through the first through hole, and an upper end surface of the mounting block has an escape groove, the escape groove is arranged corresponding to the position of the pillar-shaped body, and a part of the pillar-shaped body is accommodated in the escape groove.

10. 10. The valve device according to claim 9, wherein the connection between the pad and the mounting block or between the pad and the valve member is further bonded by an adhesive or welded, or the connection between the mounting block and the valve seat is further bonded by an adhesive.

11. A motor-operated valve comprising the valve device according to any one of claims 1 to 10, the motor-operated valve further comprising a valve body, the valve body having a valve body chamber, a part of the valve device being located in the valve body chamber, the mounting block having a second communicating hole, the valve body having a second screw hole, the motor-operated valve further comprising a second bolt unit screwed through the second communicating hole into the second screw hole in the valve body, a lower end surface of the flange portion abutting against the valve body, and the mounting block abutting against an upper end surface of the flange portion, thereby fixing the valve device to the valve body.

12. 12. The motor-operated valve according to claim 11, wherein the valve body includes a first flow passage and a second flow passage, the first flow passage and the second flow passage communicate with each other via the valve device, and the valve device adjusts the amount of operating medium passing between the first flow passage and the second flow passage.

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