JP3189312U - New electronic expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic expansion valve having a simple structure, a rational structure, a high production efficiency, and a low production cost. SOLUTION: This is a new type electronic expansion valve, and a half-split rotor core 72 divided into two is used and put into a hollow magnetic body 6 to form one whole rotating rotor. Half-split screw receiving part 711 that matches the external thread of the support rod along the axis of the half-split rotor core 72, moving vacant part 712 of the rotor core 72 that is wider than the half-split screw receiving part 711, and a slightly narrow valve pin. The tail groove portion 714 of the valve pin, which is wider than the shaft hole portion and the shaft hole portion of the valve pin, is machined. Support rods and valve pins with upper and lower limit positioning stairs are installed in the constructed half-divided mounting holes 710, and upper and lower limits are installed between the moving vacant space 712 of the half-divided rotor core 72 and the support rods. Lift braking of the hollow magnetic body 6 and the rotor core 72 is realized through the positioning stairs. [Selection diagram] Fig. 3

Description

    The present invention relates to a valve, and more particularly to an electronic expansion valve that controls a fluid.

The magnetic rotor is rotated using the drive of the coil, the rotation of the magnetic rotor is converted into the vertical movement of the screw, and the size of the passage (opening) of the valve port is increased and lowered by the valve core to which the screw is fixedly connected. Means for controlling the flow rate and controlling the flow rate with the magnitude are known. When the ascending and descending positions are all on / off positions, the rotation of the magnetic rotor and the movement of the valve pin are stopped by the dedicated upper stopper structure and lower stopper structure.
The number of parts of the upper stopper structure and the lower stopper structure of the existing electronic expansion valve is large, the structure is complicated, it is complicated to assemble, and the production cost is high. For example: The electronic expansion valve of China Patent No. 201010144646.9 includes slip ring, shaft core, spring guide and stopper rod in upper and lower stopper structure.

Chinese Patent No. 201010144646.9

    The object of the present invention is to provide a new electronic expansion valve that overcomes the shortage of existing technology and has a simple structure and low production cost.

    In order to solve the existing technical problems described above, the utility model provides the following technical solutions.

    The new electronic expansion valve has a cover and a valve seat that can be docked up and down, has a valve opening in the valve seat, and an outlet pipe connected to the valve opening is connected to the lower part of the valve seat. An import pipe is installed on the outer wall of the pipe; a hollow support rod is connected to the upper part of the valve seat, and there is an external thread on the upper outer wall of the support pole; There is a communication hole to connect the valve port; a valve pin corresponding to the size of the valve port opening for controlling the valve seat is inserted in the hollow hole of the support rod; A hollow magnetic body that can be rotated and moved up and down is installed; a rotor core of the rotating body connected to the magnetic body is located in a hollow hole of the magnetic body, and a support rod and a valve pin are provided in the rotor core. Mounting holes are installed; the rotor core is halfway along the center of the mounting holes It consists of two rotor cores, and a docking positioning structure is installed between the contact surfaces of the two half-split rotor cores; the rotor core mounting holes are also divided into two half-split mounting holes The half-divided mounting holes of the half-divided rotor core are arranged in the order from bottom to top, the half-split screw receiving part that is opposed to the outer thread of the support bar, the moving cavity part of the rotor core, and the shaft of the valve pin Divide into a hole and the tail groove of the valve pin; the protruding part at the upper end of the valve pin enters the tail groove of the valve pin, and there is a spring return tool that returns the valve pin into the tail groove part of the valve pin A lower limit positioning that realizes docking when the rotating body moves up to open the valve port fully between the upper part of the outer thread of the support bar and the bottom part of the moving vacant part of the half-divided rotor core therein. There is a staircase; above the outer thread of the support bar There is an upper limit position stairs, each rotating body is valve port to move to the bottom realizes the operation stop when fully closed between the top of the moving rates of one half-split rotor core therein.

    Among the proposed improvements to the new electronic expansion valve, the docking positioning structure described includes at least a positioning pin and a positioning hole.

    Among the above-mentioned proposals for improving the new electronic expansion valve, the hollow magnetic body and one half-divided rotor core are positioned through at least a pair of linear grooves and a linear protrusion; the rotor core is located at the exposed portion of the upper end of the rotor core. An anti-detachment tool is installed to prevent slipping from the magnet.

    Compared with the existing technology, the beneficial effect of the present invention relies on combining the half-divided rotor core in half into a hollow magnetic body to form a whole rotating rotor. A half-divided screw receiving part that fits the outer thread of the support rod along the axis of the half-divided rotor core, a moving cavity part of the rotor core wider than the half-divided screw receiving part, a shaft hole part and valve of a slightly narrower valve pin The tail groove of the valve pin that is wider than the shaft hole of the pin is machined. A support rod and a valve pin with a lower positioning step are installed on the half-divided mounting hole, and the rotor core moving air of the half-divided rotor core is installed. Through the upper and lower positioning steps between the room and the support rod, lift braking of the hollow magnetic body and the rotor core is realized. Like the current electronic expansion valve, it is not necessary to add a few additional parts and to realize the lower sudupa, the number of parts of the expansion valve is smaller, the structure is simplified, and the assembly is easy. It becomes easy. Therefore, the structure of the present invention is simple, rational, high production efficiency, and low production cost.

    The following is a detailed explanation of the present invention according to the attached drawings and specific implementation methods:

    The present invention is a new electronic expansion valve. As shown in FIGS. 1 to 7, for example, the new electronic expansion valve of the present invention has a U-shaped cover 2 and a “ten” -shaped valve seat 3 that can be docked up and down. In addition, there is a valve port 31 in the valve seat 3, and an outlet pipe 100 communicating with the valve port 31 is connected to the lower part of the valve seat 3. There is an imported pipe 200 on the outer wall of the lower part of the cover 2; the upper part of the valve seat 3 is connected to a hollow “convex” shaped support bar 4; the outer wall of the upper part of the support bar 4 has an outer thread 41; A communication hole 42 for connecting the imported pipe 200 and the valve port 31 of the valve seat 3 is opened at the lower part of the rod 4; the opening of the valve port 31 for controlling the valve seat 3 is formed in the hollow hole 43 of the support rod 4 There are 51 valve pins 5 corresponding to the size (generally T-type); in the cover 2 there is a hollow magnetic body 6 that can rotate and move up and down in this; in the hollow hole 61 of the hollow magnetic body 6 6 has a rotor core 7 of a rotating body connected to 6, and a mounting hole 71 for mounting the support rod 4 and the valve pin 5 in the rotor core 7; the rotor core 7 extends along the center of the mounting hole 71. There is a docking positioning 8 between the contact surfaces of the two half rotor cores 72, which are divided into two half rotor cores 72; the mounting holes 71 of the rotor core 7 are also two half The split mounting holes 710 are divided into half split mounting holes 710; the split split mounting holes 710 of the split split rotor core 72 are in the order from bottom to top in half split screw receiving portions 711 facing the thread of the external thread 41 of the support bar 4; The rotor core is divided into a moving cavity portion 712, a shaft pin portion 713 of the valve pin, and a tail groove portion 714 of the valve pin. Among them, the cross-section of the rotor core moving cavity 712 is larger than the half-split screw receiving part, but the cross-section of the valve pin shaft hole 713 is almost smaller than the rotor core moving cavity 712 and the tail groove 714 of the valve pin. As shown in FIGS. 5 and 7, the upper 51 of the valve pin 5 enters the tail groove 714 of the valve pin, and the spring return tool 9 for returning the valve pin 5 is located in the tail groove portion 714 of the valve pin. . When the rotating body moves up between the upper part of the outer thread 41 of the support bar 4 and the bottom of the moving cavity portion 712 of the half-divided rotor core 72, the valve opening is fully opened. There are lower limit positioning steps 45 and 721 that realize the following; a rotating body is provided between the upper part of the outer thread 41 of the support bar 4 and the upper part of the moving core part 712 of the rotor core of one half-divided rotor core 72 therein. There are upper limit positioning steps 44, 722 that realize a sudupper when moved down and fully closed.

    When assembling this example, it is usually assembled like this:

    1) The cover 2 and the imported pipe 200 are welded with a laser to form the first assembly;

    2) After the tunnel furnace welding of the valve seat 3 and the outlet pipe 100, the second assembly is constructed;

    3) Connect the second assembly and the support bar 4 to form the third assembly (adopting plastic connection);

    4) Insert the valve pin 5 to which the spring return tool 9 is attached into the third assembly, or sandwich the two half-divided rotor cores 72 between the support rod 4 and the upper part of the valve pin 5, and docking positioning structure 8 After positioning, the rotor core 7 is closed. When assembling, it is necessary to pay attention to matching the half-split screw receiving portion 711 of the half-split rotor core with the external thread 41 of the support bar 4. On the support rod 4, the lower positioning stairs 44, 45 are placed in the rotor core moving cavity 712 and the valve pin 5 51 is placed in the half grooved rotor core 72 valve pin tail groove 714;

    5) Also, the rotor core 7 is fixed from the bottom to the top by the hollow magnetic body 6 and connected together;

    6) Finally, set the cover 2 outside the rotating body and weld it together with the valve seat 3 to complete the installation of the electronic expansion valve.

    When using the present invention, after energizing the coil of the electronic expansion valve, when the hollow magnetic body 6 rotates by driving the rotor core 7, the outer thread 41 of the support bar 4 and the two half-divided rotor cores The rotor core and the hollow magnetic body can be synchronously raised or lowered by matching between the screw receiving portions in the rotor core constituted by the half-split screw receiving portion, and the valve pin 5 is driven by the rotor core. Go up and down. For example, when the valve pin is raised, the opening of the valve port 31 of the valve seat 3 controlled by the lower part of the valve pin becomes larger and the flow rate of the fluid controlled by the electronic expansion valve increases, and the lower limit positioning step 721 of the half-divided rotor core Stops raising when it touches the lower positioning step 45 on the support bar 4, at this time, the electronic expansion valve is completely open. When the hollow magnetic body and the rotor core are lowered, the valve pin 31 is gradually lowered by the action of the spring return tool, and then the opening of the valve port 31 of the valve seat 3 becomes smaller and the fluid flow rate controlled by the electronic expansion valve is increased. When the upper limit positioning step 722 in the moving cavity portion 712 of the rotor core touches the upper limit step 44 of the support bar 4, the hollow magnetic body and the rotor core stop being lowered. At this time, the lower part of the valve pin completely locks the valve port 31 of the valve seat 3 so that the electronic expansion valve is completely closed.

    In view of the above contents, the present invention sets two half-divided rotor cores 7 in the hollow magnetic body 6 to constitute one whole rotating body. Then, the half split screw receiving portion 711 that fits the outer thread of the support rod along the axis of the half split rotor core 72, the rotor core moving cavity 712 wider than the half split screw receiving portion 711, and the shaft hole of a slightly narrow valve pin The tail groove 714 of the valve pin wider than the shaft hole 713 of the valve pin 713 is processed. The upper support rods 4 and 51 and the valve pins 5 of the lower limit positioning steps 44 and 45 are installed on the upper part of the half-divided mounting hole 710 formed thereby. Further, the lift braking of the rotating body is realized by the upper and lower limit positioning steps between the inner space of the rotor core of the half-divided rotor core 72 and the support rod. Unlike the current electronic expansion valve, the number of additional parts is not necessarily added to realize the upper and lower slippers, and the expansion valve has fewer parts, the structure is simple, and the assembly is easy. As a result, the structure of the present invention is simple, reasonable, high in production efficiency, and low in production cost.

    As shown in FIGS. 4 and 7, upper and lower limit positioning steps 722 and 721 in the rotor core are provided at the upper and lower ends in the rotor core moving vacant space 712 of the half-split rotor core 72 different from each other. Of course, the upper and lower limit positioning steps 722 and 721 can also be installed at the upper and lower ends in the rotor core moving vacant stage 712 of the same half-split rotor core 72. The lower limit positioning steps 44 and 45 on the support bar 4 may be the same convex base, or may be two independent convex bases. As indicated by 3 and 7 in the drawing, this makes it easy to process the positioning.

    In this embodiment, as shown in FIGS. 3, 4, and 6, the docking positioning structure 8 includes at least two pairs of positioning pins 81 and positioning holes 82. Of course, other structures may be used. However, it is only necessary that the screw between the inner screw receiving portion and the outer thread of the support bar which are formed by combining the two half-divided rotor cores are smoothly connected.

    In this embodiment, the hollow magnetic body 6 and the half-divided rotor core 72 are docked through at least a pair of linear grooves 20 and linear protrusions 30 as indicated by 3 and 4 in the drawing. Therefore, the linear groove and the linear protrusion are respectively installed in the hollow magnetic body and the outer wall of the half-divided rotor core 72. Of course, they can be installed on the outer wall of the half-split rotor core and the hollow magnetic body respectively; the anti-detachment tool 40 is installed on the exposed part of the upper part of the rotor core 7 so that the rotor core does not slip from the magnetic body. When the rotor core comes out of the hollow magnetic body with the circlip, the anti-detachment tool 40 meshes properly with the circlip. Of course, the anti-detachment tool may have another structure, for example, a latch or the like.

    In this example, the half-divided rotor core 72 uses an ordinary molded product, the half-divided screw receiving portion 711 of the half-divided mounting hole 710, the moving cavity portion 712 of the rotor core, the shaft hole portion 713 of the valve pin and the valve The pin tail groove 714 can be directly molded. Other positioning pins 81 or positioning holes 82 can be molded together. As a result, the accuracy of the rotor core can be increased, the production efficiency can be further increased, and the production cost can be reduced. The spring return tool 9 is a compression spring.

    Although the present invention will be described in detail with reference to the above-described embodiments, various changes to the present invention will be made through the disclosure of the present invention without departing from the principle and spiritual scope of the limited utility model explained. And can be corrected. Accordingly, the detailed description of the disclosed embodiments is merely an interpretation and does not limit the present invention. However, the scope of protection is limited by the content of the rights request.

3 is a three-dimensional view of an embodiment of the present invention; FIG. 3 is a three-dimensional view of the embodiment of the present invention in a half-split state; 1 is an assembly sketch of the embodiment of the present invention; FIG. 2 is an assembly sketch 2 of an embodiment of the present invention; FIG. 3 is a structural sketch of the embodiment of the present invention; FIG. 6 is a cross-sectional view in the AA direction of FIG. 5; It is an installation sketch between a rotor core, a support bar, and a valve seat of an embodiment of the present invention.

100: outlet pipe 2: cover 2
2: U-shaped cover 20: Linear groove 200: Import pipe 3: "Ten" -shaped valve seat 30: Linear protrusion 31: Valve port 4: Hollow "convex" -shaped support bar 40: Detachable tool 41: External thread 42: communication hole 43: hollow hole 44, 722: upper limit positioning step 45, 721: lower limit positioning step 5: valve pin 51: valve pin 5 upper part 6: hollow magnetic body 61: hollow hole 7: rotor core 71: mounting hole 710 : Mounting hole 711: Half-divided screw receiving part 712: Moving cavity of rotor core 713: Valve pin shaft hole part 714: Valve pin tail groove part 72: Rotor core 722, 721: Upper and lower limit positioning steps 8: Docking Positioning 81: Positioning pin 82: Positioning hole 9: Spring return tool

Claims (3)

Electronic expansion valve with the following characteristics;
It has a cover (2) and a valve seat (3) that can be docked up and down. The outlet pipe (100) is connected and the import pipe (200) is on the outer wall at the bottom of the cover (2);
A hollow support rod (4) is connected to the top of the valve seat (3), and there is an external thread (41) on the outer wall of the upper portion of the support rod (4);
A communication hole (42) for connecting the import pipe (200) and the valve port (31) of the valve seat (3) is formed in the lower part of the support rod (4);
A valve pin (5) corresponding to the opening size of the valve port (31) of the valve seat (3) is inserted into the hollow hole (43) of the support rod (4);
Inside the cover (2) is a hollow magnetic body (6) that can rotate and move up and down in the cover (2);
A rotor core (7) which is a rotating body connected to the hollow magnetic body (6) is installed in the hollow hole (61) of the hollow magnetic body (6), and is supported in the rotor core (7). Mounting holes (71) are installed for mounting rods and valve pins;
The rotor core (7) is divided in half along the center of the mounting hole (71) and is divided into two half-divided rotor cores, and the half-divided rotor core (7) divided into the two is divided. A docking positioning structure (8) is installed between the contact surfaces;
The mounting hole (71) of the rotor core (7) is also divided into two halves;
The half-divided mounting hole (71) of the half-divided rotor core (7) has a half-divided screw receiving portion (711) opposed to the external thread (41) of the support bar (4) from the bottom to the top, and the rotor core Divided into a movable vacant part (712) of (7), a shaft hole part (713) of the valve pin (5) and a tail groove part (714) of the valve pin (5);
The protruding part of the upper part (51) of the valve pin (5) enters the tail groove part (714) of the valve pin (5), and enters the tail groove part (714) of the valve pin (5) to the valve pin (5 Spring return tool (9) is installed;
Between the upper part of the outer thread (41) of the support bar (4) and the bottom part of one vacant part (712) of the half-divided rotor core (72), the rotating bodies respectively move upward and the valve ports (31 ) Has a lower positioning step (721) that realizes docking when fully open;
The rotating body moves downward between the upper part of the outer thread (41) of the support bar (4) and the upper part of the moving vacant part (712) of one rotor core of the half-split rotor core (72). An upper limit positioning step (722) is provided that realizes operation stop when the valve port (31) is fully closed.   The electronic expansion valve of claim 1, wherein said docking positioning structure (8) includes at least two pairs of positioning pins (81) and positioning holes (82). The hollow magnetic body (6) and the half-divided rotor core (7) perform docking positioning through at least a pair of linear grooves (20) and a linear protrusion (30), and the rotor is exposed to the upper portion of the rotor core (7). The electronic expansion valve according to claim 1 or 2, characterized in that an anti-detachment tool (40) is installed so that the core (7) does not slip from the magnet.