Press fitting assembly

Abstract

The utility model relates to the technical field of electromagnetic water inlet valve diaphragm assembly, and discloses a press-fitting assembly which comprises an installation piece, a first spring, an ejector pin, an expansion pipe and an elastic component, a vertically-arranged first channel is arranged in the installation piece, and the bottom end of the first channel penetrates through the bottom of the installation piece. The first spring and the ejector pin are sequentially installed in the first channel from top to bottom, the top end of the ejector pin is connected with the bottom end of the first spring, the bottom end of the ejector pin extends out of the bottom end of the first channel, the ejector pin can slide in the vertical direction, and the expansion pipe is arranged at the bottom end of the ejector pin in a sleeving mode and comprises a plurality of pressing blocks arranged around the axis of the ejector pin. The top ends of the pressing blocks are connected with the bottom of the mounting piece, the multiple elastic components surround the periphery of the expansion pipe, and the elastic components are connected with the pressing blocks in a one-to-one correspondence mode. According to the utility model, the diaphragm and the diaphragm frame can be assembled in place, and the assembly efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic water inlet valve diaphragm assembly, in particular to a press-fit assembly. Background Art

[0002] Solenoid water inlet valves are widely used in household appliances such as washing machines, dishwashers, water purifiers, coffee machines, ice machines, fruit and vegetable machines, and are in great demand. The structure of existing solenoid water inlet valves usually includes: valve body, diaphragm frame 1, diaphragm 2, valve cap, valve core assembly, coil, spring and valve cover. Figure 1 As shown, the diaphragm frame 1 is provided with a center hole 11, and the diaphragm 2 is installed on the diaphragm frame 1. The working principle of this type of electromagnetic water inlet valve is as follows: when the coil is not energized, the valve core assembly, under the action of the spring force, causes the valve cap to block the center hole 11 of the diaphragm frame, and the incoming water flows into the back of the diaphragm through the side holes of the diaphragm frame and generates back pressure. Under the action of the back pressure, the diaphragm frame 1 presses the diaphragm 2 to seal the water path, and at this time, the water inlet and the water outlet of the valve body are not connected; after the coil is energized, the valve core assembly, under the attraction of the electromagnetic force of the coil, causes the valve cap to separate from the center hole 11 of the diaphragm frame 1, and the water entering the back of the diaphragm 2 flows out through the center hole, resulting in the back pressure being less than the inlet pressure, and the diaphragm frame 1 is lifted under the action of the pressure difference, so that the diaphragm 2 no longer seals the water path, and at this time, the water inlet and the water outlet of the valve body are connected. It can be seen that the pressure difference between the diaphragm 2 and the diaphragm frame 1 has an important influence on the on-off of the electromagnetic water inlet valve. Therefore, in order to ensure that the electromagnetic water inlet valve can work normally, during the production process of the electromagnetic water inlet valve, it is necessary to ensure that the diaphragm 2 and the diaphragm frame 1 are fully assembled.

[0003] The structure of the diaphragm frame is generally as follows Figure 2 As shown, a positioning pin 12 is provided on the top of the diaphragm frame 1, and a clamping ring 13 is provided on the top of the positioning pin 12. The clamping ring 13 is in a conical shape that gradually expands from top to bottom. The material of the diaphragm frame 1 is generally plastic; the structure of the diaphragm 2 is generally as follows Figure 3 As shown, a mounting hole 21 is provided on the top of the diaphragm 2; during assembly, the diaphragm 2 is first placed above the diaphragm frame 1 so that the position of the mounting hole 21 is aligned with the position of the clamping ring 13, and then the diaphragm 2 is pressed down. During the pressing process, the mounting hole 21 gradually expands under the action of the clamping ring 13. When the mounting hole 21 passes through the clamping ring 13, under the action of elastic force, the inner side wall of the mounting hole 21 abuts against the outer side of the positioning pin 12. At this time, the diaphragm 2 is well installed on the diaphragm frame 1. The assembled structure is as shown in FIG. Figure 4 shown.

[0004] The traditional use of manual labor and handheld clamps to assemble diaphragms and diaphragm frames has the following problems: the parts are small and difficult to pick up and operate, the manual assembly efficiency is low, and the production efficiency is low; since there is no press-fit assembly suitable for the diaphragm and diaphragm frame, and the rubber parts are elastic, manual press-fitting is prone to improper assembly, such as the diaphragm getting stuck on the retaining ring of the diaphragm frame, causing leakage or loosening and failure; in addition, manual clamps are prone to scratching plastic diaphragm frames or rubber parts, causing leakage. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a press-fit assembly which can ensure that the diaphragm and the diaphragm frame are assembled in place and has high assembly efficiency.

[0006] In order to solve the above technical problems, the utility model provides a press-fit assembly, including a mounting piece, a first spring, an ejector pin, an expansion tube and an elastic member, wherein a vertically arranged first channel is arranged in the mounting piece, and the bottom end of the first channel passes through the bottom of the mounting piece, the first spring and the ejector pin are sequentially installed in the first channel from top to bottom, the top end of the ejector pin is connected to the bottom end of the first spring, the bottom end of the ejector pin extends out of the bottom end of the first channel, the ejector pin can slide vertically, the expansion tube is sleeved on the bottom end of the ejector pin, the expansion tube includes a plurality of pressing blocks arranged around the axis of the ejector pin, the top end of the pressing block is connected to the bottom of the mounting piece, a plurality of elastic members are arranged, the plurality of elastic members are arranged around the outer periphery of the expansion tube, and the elastic members are connected to the pressing blocks in a one-to-one correspondence;

[0007] When the bottom end of the expansion tube is subjected to external force, the bottom end of the expansion tube expands outwards, and when the external force is removed, the expansion tube is reset under the action of the elastic component.

[0008] As a preferred embodiment of the present utility model, the mounting member includes a pressure plate, a receiving block and a fixed block connected in sequence from top to bottom, the receiving block is provided with a first through hole, the fixed block is provided with a second through hole, the first through hole and the second through hole are connected to form the first channel, the first spring is provided in the first through hole, the ejector pin can be slidably inserted in the second through hole, the top end of the ejector pin is provided with a first flange, and the first flange is mounted on the top surface of the fixed block.

[0009] As a preferred solution of the utility model, a connecting block is connected to the bottom of the mounting member, the connecting block is provided with a second channel for the expansion tube to pass through, the top of the pressing block is provided with a second flange extending outward, and the second flange is mounted on the top surface of the connecting block.

[0010] As a preferred embodiment of the present invention, the connecting block is provided with a connecting hole connected to the side of the second channel, and the elastic component includes a clamping bolt, a second spring and a pressure head which are arranged in the connecting hole from the outside to the inside, the clamping bolt is threadedly connected to the connecting hole, and the pressure head extends into the second channel away from the clamping bolt and abuts against the side of the pressure block.

[0011] As a preferred solution of the utility model, a sleeve is installed in the first channel, the sleeve is sleeved on the upper part of the ejector pin, and a connecting groove matching with the sleeve is provided on the upper part of the pressing block.

[0012] As a preferred solution of the utility model, the top surface of the connecting block is fitted and connected to the bottom surface of the mounting piece, a receiving groove is provided at the bottom of the mounting piece, the second flange is located in the receiving groove, and there is a distance between the outer side of the second flange and the inner side wall of the receiving groove.

[0013] As a preferred solution of the utility model, a positioning pin coaxially arranged with the ejector pin is provided at the bottom of the ejector pin.

[0014] The press-fitting assembly of the utility model embodiment has the following beneficial effects compared with the prior art: the utility model can realize the relative positioning of the ejector pin, the diaphragm and the diaphragm frame by inserting the ejector pin into the mounting hole of the diaphragm so that the diaphragm is sleeved on the ejector pin, and then aligning the ejector pin with the clamping ring of the diaphragm frame; thereafter, the mounting part is moved downward, the ejector pin will touch the top end of the clamping ring, so that the first spring is compressed to ensure that the mounting part can continue to move downward, and because the diameter of the ejector pin is consistent with the diameter of the top end of the clamping ring of the diaphragm frame, when the mounting part moves downward, the expansion tube will gradually expand under the action of the clamping ring and press the diaphragm downward until the diaphragm is sleeved on the positioning pin of the diaphragm frame, thereby realizing the assembly of the diaphragm and the diaphragm frame, which is simple to operate and has high assembly efficiency. In the process of the expansion tube pressing the diaphragm downward, the bottom end of the expansion tube keeps acting on the edge of the mounting hole of the diaphragm, thereby effectively preventing the diaphragm from being stuck on the clamping ring during the press-fitting process, and ensuring that the diaphragm can be assembled on the diaphragm frame intact. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an existing electromagnetic water inlet valve;

[0016] Figure 2 It is a structural diagram of a diaphragm frame of an existing electromagnetic water inlet valve;

[0017] Figure 3 It is a structural diagram of the diaphragm of the existing electromagnetic water inlet valve;

[0018] Figure 4 It is an assembly structure diagram of the diaphragm and diaphragm frame of the existing electromagnetic water inlet valve;

[0019] Figure 5 It is a structural diagram of the press-fit assembly of the utility model;

[0020] Figure 6 It is a cross-sectional view of the press-fit assembly of the utility model;

[0021] Figure 7 It is a structural diagram of the expansion tube of the utility model;

[0022] In the figure, 1, diaphragm frame; 11, center hole; 12, positioning pin; 13, retaining ring; 14, step; 2, diaphragm; 21, mounting hole; 3, mounting piece; 31, first channel; 32, pressure plate; 33, receiving block; 331, first through hole; 34, fixing block; 341, second through hole; 35, sleeve; 4, first spring; 5, ejector pin; 51, first flange; 52, positioning pin; 6, expansion tube; 61, pressure block; 611, connecting groove; 62, second flange; 7, elastic member; 71, tightening bolt; 72, second spring; 73, pressure head; 8, connecting block; 81, second channel; 82, connecting hole. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] like Figure 5-7As shown, a press-fit assembly of a preferred embodiment of the utility model comprises a mounting member 3, a first spring 4, an ejector pin 5, an expansion tube 6 and an elastic member 7. A vertically arranged first channel 31 is arranged in the mounting member 3. Generally, the top end of the first channel 31 is a closed end, and the bottom end of the first channel 31 passes through the bottom of the mounting member 3. The first spring 4 and the ejector pin 5 are sequentially arranged in the first channel 31 from top to bottom. The first spring 4 is arranged vertically, the top end of the ejector pin 5 is connected to the bottom end of the first spring 4, and the bottom end of the ejector pin 5 extends out of the bottom end of the first channel 31. The ejector pin 5 can slide vertically. The expansion tube 6 is sleeved on the bottom end of the ejector pin 5, and the ejector pin 5 is slidably connected to the expansion tube 6. The expansion tube 6 comprises a plurality of pressing blocks 61 arranged around the axis of the ejector pin 5, the top end of the pressing block 61 is connected to the bottom of the mounting member 3, and the pressing block 61 cannot move upward. A plurality of elastic members 7 are arranged, and the plurality of elastic members 7 are arranged around the outer periphery of the expansion tube 6. The elastic members 7 are connected to the pressing blocks 61 in a one-to-one correspondence.

[0026] When the bottom end of the expansion tube 6 is subjected to external force, the bottom end of the expansion tube 6 expands outward, that is, the bottom ends of the plurality of pressing blocks 61 move outward respectively. At this time, the elastic member 7 is compressed to generate elastic force. When the external force is removed, the expansion tube 6 is reset under the elastic force of the elastic member 7.

[0027] It should be noted that the diameter of the ejector pin 5 is consistent with the diameter of the mounting hole of the diaphragm (the diaphragm to be assembled) and the diameter of the top end of the retaining ring of the diaphragm frame (the diaphragm frame to be assembled). When the ejector pin 5 is inserted into the mounting hole, the diaphragm is sleeved on the ejector pin 5 and can move together with the ejector pin 5 (that is, at this time, there is an interference fit between the ejector pin 5 and the mounting hole); the working principle of the press-fitting assembly is as follows: during assembly, the mounting member 3 is first moved to the top of the diaphragm so that the position of the ejector pin 5 corresponds to the position of the mounting hole of the diaphragm to be assembled, that is, the ejector pin 5 is coaxially arranged with the mounting hole; then the mounting member 3 is driven to move downward until the ejector pin 5 is inserted into the mounting hole of the diaphragm, at which time the expansion tube 6 is located above the diaphragm, and the diaphragm can move together with the ejector pin 5; then the mounting member 3 is moved to the top of the diaphragm frame so that the ejector pin 5 and the diaphragm are located above the diaphragm frame, and the position of the ejector pin 5 corresponds to the position of the retaining ring of the diaphragm frame (that is, the ejector pin 5 is coaxially arranged with the retaining ring); Then the mounting member 3 is moved downward. Since the diameter of the ejector pin 5 is consistent with the diameter of the mounting hole of the diaphragm and the diameter of the top end of the retaining ring of the diaphragm frame, the bottom end of the ejector pin 5 will touch the top end of the retaining ring during the downward movement of the mounting member 3. As the mounting member 3 continues to move downward, the first spring 4 will be compressed, and the expansion tube 6 will continue to move downward, thereby pressing the diaphragm sleeved on the ejector pin 5 downward so that it is sleeved on the retaining ring. Since the retaining ring is a conical structure that gradually expands from top to bottom, as the mounting member 3 moves downward, the bottom end of the expansion tube 6 will be gradually expanded outward by the force of the retaining ring, so that the expansion tube 6 keeps pressing the diaphragm downward (the mounting hole of the diaphragm gradually expands) until the mounting hole of the diaphragm passes through the retaining ring, and the diaphragm is sleeved on the positioning pin to complete the assembly of the diaphragm and the diaphragm frame. Finally, the mounting member 3 is moved upward, the ejector pin 5 is reset under the elastic force of the first spring 4, and the expansion tube 6 is gradually reset under the action of the elastic member 7.

[0028] The present embodiment inserts the ejector pin 5 into the mounting hole of the diaphragm so that the diaphragm is sleeved on the ejector pin 5, and then aligns the ejector pin 5 with the snap ring of the diaphragm frame, so that the relative positioning of the ejector pin 5, the diaphragm and the diaphragm frame can be achieved; thereafter, the mounting member 3 is moved downward, and the ejector pin 5 touches the top of the snap ring, so that the first spring 4 is compressed to ensure that the mounting member 3 can continue to move downward, and because the diameter of the ejector pin 5 is consistent with the diameter of the top of the snap ring of the diaphragm frame, when the mounting member 3 moves downward, the expansion tube 6 will gradually expand under the action of the snap ring and press the diaphragm downward until the diaphragm is sleeved on the positioning pin of the diaphragm frame, thereby achieving the assembly of the diaphragm and the diaphragm frame, which is simple to operate and has high assembly efficiency. In the process of the expansion tube 6 pressing the diaphragm downward, the bottom end of the expansion tube 6 keeps acting on the edge of the mounting hole of the diaphragm, thereby effectively preventing the diaphragm from being stuck on the snap ring during the press-fitting process, and ensuring that the diaphragm can be assembled on the diaphragm frame intact.

[0029] Exemplarily, a positioning pin 52 is provided at the bottom end of the ejector pin 5, and the positioning pin 52 is coaxially arranged with the ejector pin 5. The diameter of the positioning pin 52 is consistent with the diameter of the center hole of the diaphragm frame. Generally, the mounting hole of the diaphragm frame is coaxially arranged with the retaining ring. Therefore, during the assembly process, when the ejector pin 5 is aligned with the retaining ring of the diaphragm frame, the positioning pin 52 is aligned with the center hole of the diaphragm frame; when the mounting member 3 moves downward, the positioning pin 52 will be inserted into the center hole of the diaphragm frame, thereby ensuring that the ejector pin 5 and the retaining ring of the diaphragm frame are accurately positioned.

[0030] Exemplarily, the mounting member 3 includes a pressing plate 32, a receiving block 33 and a fixing block 34 connected in sequence from top to bottom. In this example, a connecting member (such as a bolt) is provided on the top of the pressing plate 32, and the connecting member passes through the receiving block 33 and is threadedly connected to the top of the fixing block 34 to realize the detachable connection of the pressing plate 32, the receiving block 33 and the fixing block 34, so as to facilitate the assembly of the press-fit assembly. The receiving block 33 is provided with a first through hole 331, and the fixing block 34 is provided with a second through hole 341. The first through hole 331 is provided in the receiving block 33, and the fixing block 34 is provided with a second through hole 341. The first through hole 331 and the second through hole 341 are respectively arranged vertically, and the first through hole 331 and the second through hole 341 are connected to form the first channel 31. The first spring 4 is arranged in the first through hole 331, and the top of the first spring 4 is connected to the bottom surface of the pressure plate 32. The ejector pin 5 can be slidably inserted in the second through hole 341. The top of the ejector pin 5 is provided with a first flange 51, and the first flange 51 is placed on the top surface of the fixing block 34 to prevent the ejector pin 5 from falling, so that the ejector pin 5 is installed in the first channel 31.

[0031] Exemplarily, a connecting block 8 is connected to the bottom of the mounting member 3. In this embodiment, the connecting block 8 is installed at the bottom of the mounting member 3 by bolts. The connecting block 8 is provided with a second channel 81 for the expansion tube 6 to pass through. The top of the pressing block 61 is provided with a second flange 62 extending outward. The second flange 62 is placed on the top surface of the connecting block 8 to achieve the installation of the expansion tube 6. It can be understood that there is a spacing between the outer side of the pressing block 61 and the inner side wall of the second channel 81 for the pressing block 61 to move outward, so as to ensure that the bottom end of the expansion tube 6 can expand outward.

[0032] Exemplarily, the top surface of the connecting block 8 is fittedly connected to the bottom surface of the mounting member 3, a receiving groove 36 is provided at the bottom of the mounting member 3, the second flange 62 is located in the receiving groove 36 and is bridged on the top surface of the connecting block 8, so that the overall structure is compact, and there is a distance between the outer side of the second flange 62 and the inner side wall of the receiving groove 36, ensuring that the bottom end of the expansion tube 6 can expand outward.

[0033] Exemplarily, the connecting block 8 is provided with a connecting hole 82 connected to the side of the second channel 81, and the elastic member 7 includes a clamping bolt 71, a second spring 72 and a pressure head 73 which are arranged in sequence from the outside to the inside in the connecting hole 82. The clamping bolt 71 is threadedly connected to the connecting hole 82, one end of the second spring 72 is connected to the clamping bolt 71, and the other end of the second spring 72 is connected to the pressure head 73. The pressure head 73 extends into the second channel 81 away from the side of the clamping bolt 71 and abuts against the side of the pressure block 61 to achieve the installation of the elastic member 7. When the bottom end of the expansion tube 6 is expanded outward by an external force, the pressure block 61 drives the pressure head 73 to move outward, and the second spring 72 is compressed. When the external force is removed, under the elastic force of the second spring 72, the pressure head 73 drives the pressure block 61 to move inward to achieve resetting.

[0034] Exemplarily, a sleeve 35 is installed in the first channel 31, that is, the sleeve 35 is fixed relative to the mounting member 3, and the sleeve 35 is sleeved on the upper part of the ejector pin 5 to prevent the ejector pin 5 from swinging. The upper part of the pressure block 61 is provided with a connecting groove 611 that cooperates with the sleeve 35, that is, the upper inner side of the pressure block 61 is fitted and connected with the outer side of the sleeve 35, and the lower inner side of the pressure block 61 is fitted and connected with the lower outer side of the ejector pin 5.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A press-fit assembly, characterized in that: The invention comprises a mounting member, a first spring, an ejector pin, an expansion tube and an elastic member, wherein a vertically arranged first channel is arranged in the mounting member, the bottom end of the first channel passes through the bottom of the mounting member, the first spring and the ejector pin are sequentially arranged in the first channel from top to bottom, the top end of the ejector pin is connected to the bottom end of the first spring, the bottom end of the ejector pin extends out of the bottom end of the first channel, the ejector pin can slide vertically, the expansion tube is sleeved on the bottom end of the ejector pin, the expansion tube comprises a plurality of pressing blocks arranged around the axis of the ejector pin, the top end of the pressing block is connected to the bottom of the mounting member, a plurality of elastic members are arranged, the plurality of elastic members are arranged around the periphery of the expansion tube, and the elastic members are connected to the pressing blocks in a one-to-one correspondence; When the bottom end of the expansion tube is subjected to external force, the bottom end of the expansion tube expands outwards, and when the external force is removed, the expansion tube is reset under the action of the elastic component.

2. The press-fit assembly according to claim 1, characterized in that: The mounting member includes a pressure plate, a receiving block and a fixed block connected in sequence from top to bottom, the receiving block is provided with a first through hole, the fixed block is provided with a second through hole, the first through hole and the second through hole are connected to form the first channel, the first spring is provided in the first through hole, the ejector pin can be slidably inserted in the second through hole, the top end of the ejector pin is provided with a first flange, and the first flange is mounted on the top surface of the fixed block.

3. The press-fit assembly according to claim 1, characterized in that: The bottom of the mounting piece is connected with a connecting block, the connecting block is provided with a second passage for the expansion tube to pass through, the top of the pressing block is provided with a second flange extending outward, and the second flange is mounted on the top surface of the connecting block.

4. The press-fit assembly according to claim 3, characterized in that: The connecting block is provided with a connecting hole connected to the side of the second channel, and the elastic component includes a clamping bolt, a second spring and a pressure head which are arranged in the connecting hole from the outside to the inside, the clamping bolt is threadedly connected to the connecting hole, and the pressure head extends into the second channel away from the clamping bolt and abuts against the side of the pressure block.

5. The press-fit assembly according to claim 1, characterized in that: A sleeve is installed in the first channel, the sleeve is sleeved on the upper part of the ejector pin, and a connecting groove matched with the sleeve is provided on the upper part of the pressing block.

6. The press-fit assembly according to claim 3, characterized in that: The top surface of the connecting block is fitted and connected to the bottom surface of the mounting piece, a receiving groove is provided at the bottom of the mounting piece, the second flange is located in the receiving groove, and there is a distance between the outer side of the second flange and the inner side wall of the receiving groove.

7. The press-fit assembly according to claim 1, characterized in that: A positioning pin is coaxially arranged with the ejector pin at the bottom of the ejector pin.

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