Piezoelectric injection valve

Abstract

The invention discloses a piezoelectric injection valve which comprises a valve body, a fluid seat, a clamping hook hinged to the valve body, a clamping shaft fixed to the fluid seat and an elastic piece acting on the clamping hook to enable the clamping hook to be clamped to the clamping shaft, and the clamping hook is clamped to the clamping shaft and enables the fluid seat and the valve body to be fixed. The clamping hook is provided with a clamping face located at the end of the hook groove and an arc-shaped transition face which is in smooth transition with the clamping face and located at the bottom of the hook groove, the clamping face is tangent to the clamping shaft, and a distance is formed between the arc-shaped transition face and the clamping shaft. According to the piezoelectric valve, the valve body and the fluid seat are hooked through the clamping hook, so that rapid disassembly and assembly between the valve body and the fluid seat are achieved, meanwhile, in the working process of the piezoelectric valve, the clamping hook can always move in the direction of the clamping shaft through the acting force applied to the clamping hook by the elastic piece, and the clamping shaft is hooked; therefore, the valve body and the fluid seat are always tightly fixed, and the dispensing stability and the dispensing quality are further ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of piezoelectric valves, and in particular to a piezoelectric injection valve capable of realizing rapid disassembly. Background Art

[0002] At present, piezoelectric valves are widely used in the high-precision, high-quality micro-viscous fluid dispensing industry. However, during the disassembly and assembly process of the flow channel in the piezoelectric valve, the screws fixing the flow channel to the valve body need to be removed first. The screw removal leads to a significant increase in the time and cost required. Therefore, the existing flow channel is difficult to disassemble and assemble, and the efficiency is low, which seriously affects the work efficiency.

[0003] In view of this, it is necessary to design a piezoelectric injection valve to solve the above problems. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention provides a piezoelectric injection valve that can achieve rapid disassembly and assembly between a valve body and a fluid seat.

[0006] According to a first aspect of the present invention, a piezoelectric injection valve is provided, comprising a valve body, a fluid seat, a hook hinged to the valve body, a clamping shaft fixed to the fluid seat, and an elastic member acting on the hook to clamp the hook to the clamping shaft, wherein the hook is clamped to the clamping shaft and fixes the fluid seat to the valve body; The hook has a holding surface located at the end of the hook groove and an arcuate transition surface smoothly transitioning with the holding surface and located at the bottom of the hook groove. The holding surface is tangent to the holding axis, and there is a distance between the arcuate transition surface and the holding axis. The beneficial effects of the present invention are as follows: the valve body and the fluid seat are hooked together by a hook, so as to achieve quick disassembly and assembly between the valve body and the fluid seat. At the same time, during the operation of the piezoelectric valve, the hook exerts a force on it through the elastic member, so that the hook can always move toward the direction of the card axis and hook the card axis, so as to ensure that the valve body and the fluid seat are always tightly fixed, thereby ensuring the stability and quality of dispensing.

[0007] Preferably, when the contact portion between the clamping surface and the clamping shaft is worn, the clamping hook moves toward the clamping shaft under the action of the elastic member, and simultaneously drives the non-wearing portion of the clamping surface to be tangent to the clamping shaft, and the distance between the arc-shaped transition surface and the clamping shaft is reduced.

[0008] Further preferably, the hinge point of the hook and the center point of the hook shaft are located on the same vertical axis.

[0009] Preferably, the valve body comprises an adjusting seat, and the hook is hinged to the adjusting seat and can rotate relative to the adjusting seat.

[0010] Further preferably, the adjustment seat has a protruding portion protruding upward, the hinge point between the hook and the adjustment seat is located at the protruding portion, and the bottom of the valve body is provided with a groove portion cooperating with the protruding portion.

[0011] Preferably, the hook comprises two hooks respectively arranged on both sides of the adjustment seat, and the two hooks are symmetrically arranged.

[0012] Further preferably, an axial hole is opened on the adjustment seat corresponding to each of the hooks, a pin is arranged in the axial hole, and the pin passes through the hook and is threadedly connected to the adjustment seat, so that the hook can rotate around the pin.

[0013] Preferably, the two symmetrically arranged hooks are connected via a connecting block, and the elastic member acts on the connecting block so that the connecting block drives the two hooks to rotate synchronously.

[0014] Further preferably, both of the two hooks are provided with a force applying protrusion, and the force applying protrusion is arranged on the other side surface opposite to the hook.

[0015] Preferably, the hinge point of the hook is located above the center point of the hook shaft, so that the hook naturally droops under the action of its gravity and is suitable for being clamped with the hook shaft.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is an assembly diagram of the valve body and the fluid seat of the piezoelectric injection valve of the present invention; Figure 2 It is a three-dimensional structural diagram of the piezoelectric injection valve of the present invention after the adjustment seat and the hook are connected; Figure 3 It is a front view of the piezoelectric injection valve of the present invention after the adjustment seat and the hook are connected; Figure 4This is a three-dimensional structural diagram of the hooks of the present invention after being connected through the connecting blocks; Figure 5 It is a structural diagram of the hook of the present invention; Figure 6 A diagram showing the changing process of the engagement between the engaging surface of the engaging hook and the engaging shaft after the engaging surface of the engaging hook of the present invention is worn; Figure 7 It is a structural diagram between the valve body and the fluid seat of the present invention; Figure 8 It is a cross-sectional view of the fluid seat of the present invention after being connected with the hook; Fig. 9 is a cross-sectional view of the adjustment seat of the present invention; Fig.10 The overall assembly diagram of the piezoelectric injection valve of the present invention after the heating component is added.

[0020] Description of reference numerals: 1. Valve body; 11. Groove portion; 2. Fluid seat; 21. Card shaft; 3. Hook; 31. Adjustment seat; 311. Shaft hole; 312. Pin; 313. Elastic member; 314. Protrusion; 315. Fixing pin; 32. Connecting block; 33. Force-applying protrusion; 4. Heating assembly; 41. Groove; A. Clamping surface; B. Arc transition surface; O1, the hinge point of the hook; O2, the center point of the shaft. DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention. In the description of the present invention, it should be understood that, unless otherwise specified, the meaning of "multiple" is two or more.

[0022] See also Figure 1 and Figure 5 The present invention discloses a piezoelectric injection valve, which includes a valve body 1, a fluid seat 2 and a hook 3, wherein the hook 3 is arranged on the valve body 1, the hook 3 is hinged to the valve body 1, the hook 3 is fixed to the fluid seat 2, and the elastic member 313 acts on the hook 3 to clamp the hook 3 to the clamping shaft 21, the hook 3 is clamped to the clamping shaft 21 to fix the fluid seat 2 and the valve body 1, and the hook 3 has a clamping surface A located at the end of the hook groove and an arc-shaped transition surface B smoothly transitioning with the clamping surface A and located at the bottom of the hook groove, and when the clamping surface A is tangent to the clamping shaft 21, there is a gap between the arc-shaped transition surface B and the clamping shaft 21. And the angle between the clamping surface A and the horizontal plane is N°.

[0023] See also Figures 2 to 4 and Figure 6 The hook 3 includes two symmetrically arranged hooks 3. After long-term operation, the hook 3 and the shaft 21 will be worn. When the contact part between the holding surface A of the hook 3 and the shaft 21 is worn, the hook 3 and the shaft 21 are in an incomplete contact state (it should be noted that the wear here may occur on the holding surface A of the hook 3, or on the contact part of the shaft 21). After wear, a small gap will be generated between the hook 3 and the shaft 21. At this time, the limiting performance of the hook 3 relative to the shaft 21 is reduced. Therefore, the hook 3 will move toward the shaft 21 under the action of the elastic member 313, so that the hook 3 and the shaft 21 always maintain a close fit state, thereby making the valve body 1 and the fluid seat 2 always in a fixed state. At this time, the non-wear part of the holding surface A of the hook 3 is tangent to the shaft 21, and the distance between the arc-shaped transition surface B and the shaft 21 is reduced, that is, l<L. After the hook 3 and the hook shaft 21 are hooked again, the relative force between the two is kept constant, that is, the valve body 1 and the fluid seat 2 are in a stable connection state at this time.

[0024] More specifically, the hinge point O1 of the hook 3 and the center point O2 of the shaft are on the same vertical axis, and the hinge point O1 of the hook 3 is located above the center point O2 of the shaft, so that the hook 3 naturally droops under the action of its gravity and is clamped with the shaft 21.

[0025] See also Figure 7 The valve body 1 includes an adjustment seat 31, and the hook 3 is hinged to the adjustment seat 31 and can rotate relative to the adjustment seat 31. The adjustment seat 31 has a protruding portion 314 protruding upward, and the hinge point O1 between the hook 3 and the adjustment seat 31 is located on the protruding portion 314, and the bottom of the valve body 1 is provided with a groove portion 11 that cooperates with the protruding portion 314. Through the mutual cooperation between the groove portion 11 and the protruding portion 314, the space required for the valve body 1 can be effectively saved.

[0026] See also Figure 8 An axial hole 311 is also provided on the adjustment seat 31 at the hinge point O1 corresponding to the two hooks 3. A pin 312 is provided in the axial hole 311. The pin 312 passes through the hook 3 and is threadedly connected to the adjustment seat 31 so that the hook 3 can rotate around the pin 312.

[0027] More specifically, a connecting block 32 is further provided between the symmetrically arranged hooks 3 , and the connecting block 32 can simultaneously connect the hooks 3 symmetrically arranged on both sides of the adjustment seat 31 , so that the symmetrically arranged hooks 3 can move synchronously.

[0028] See also Fig. 9In order to apply force to the hook 3 and the connecting block 32, a receiving cavity is provided in the adjustment seat 31, and an elastic member 313 is provided in the receiving cavity. The elastic member 313 is fixedly installed in the receiving cavity through a fixing pin 315. One end of the elastic member 313 is provided in the adjustment seat 31, and the other end acts on the connecting block 32, so that the connecting block 32 can drive the two symmetrically arranged hooks 3 to always move toward the card shaft 21, and when a gap is generated between the hook 3 and the card shaft 21, the hook 3 can immediately move toward the card shaft 21 and hook with the card shaft 21, thereby ensuring that the valve body 1 and the fluid seat 2 are always in a tightly connected state. It should be noted that the connecting block 32 is not necessary, and the connecting block 32 is provided to ensure the synchronization of the two symmetrically arranged hooks 3. Of course, only one hook 3 or two independent hooks 3 may be provided. If only one hook 3 is provided, a force is applied to the hook 3 through the elastic member 313 alone. If two independent hooks 3 are provided, a force is applied to each hook 3 through the elastic member 313 respectively.

[0029] Of course, the elastic member 313 provided in this embodiment is a torsion spring. On this basis, in order to ensure that a force in a fixed direction is stably generated on the hook 3 and the connecting block 32, a fixing spring can also be provided on the connecting block 32. The fixing spring is vertically provided on the connecting block 32, so that one end of the fixing spring is connected to the top of the connecting block 32, and the other end is connected to the adjustment seat in the vertical direction thereof, and then the fixing spring can generate a downward thrust on the connecting block 32, and then the connecting block 32 drives the hook 3 to rotate around the pin 312 toward the direction of the card shaft 21. In addition, a tension spring can also be provided on the side of the hook 3, one end of the tension spring is connected to the area on the hook 3 corresponding to the connecting block 32, and the other end is connected to the adjustment seat 31, and the tension spring can pull the hook 3 so that the hook 3 continues to move toward the card shaft 21 until the hook 3 and the card shaft 21 are hooked.

[0030] More specifically, the adjustment seat 31 is connected to the valve body 1, and the striker in the valve body 1 is suitable for passing through the adjustment seat 31, and can drive the adjustment seat 31 to move synchronously, and then the distance between the striker and the nozzle set at the outlet of the fluid seat 2 can be controlled by adjusting the position of the seat 31. The hook 3 is rotatably set on the adjustment seat 31, and the hook 3 and the adjustment seat 31 are detachably connected. When the hook 3 is hooked with the card shaft 21, there is usually a hard contact between the hook 3 and the card shaft 21. Therefore, wear and tear will inevitably occur during the continuous contact process. If the hook 3 is worn to a certain extent, the hook 3 can be replaced more conveniently by detachably connecting the hook 3 with the adjustment seat 31, and when replacing, only the hook 3 itself needs to be replaced, and other structures can continue to be used normally, thereby effectively reducing the cost required for replacement.

[0031] Furthermore, in order to limit the rotational stroke of the hook 3, a limiting portion that can abut against the connecting block 32 is provided on the adjusting seat 31 and the fluid seat 2, wherein when the hook 3 is manually driven to rotate, the lower end surface of the connecting block 32 can abut against the fluid seat 2, and the upper end surface of the connecting block 32 can abut against the adjusting seat 31, and when the connecting block 32 abuts against the adjusting seat 31 and the fluid seat 2, the contact between the two is surface contact.

[0032] In order to facilitate the operator to operate the hook 3, a force-applying protrusion 33 is provided on the hook 3, and at least one force-applying protrusion 33 is symmetrically provided on the symmetrically provided hook 3. The two force-applying protrusions 33 symmetrically provided on the hook 3 are respectively provided on the outer sides of the hook 3, and the force-applying protrusions 33 extend along the sides of the hook 3, so that the operator has a larger working area when operating the force-applying protrusion 33. At the same time, the hook 3 adopts a method of rotating the hook connected to the clamping shaft 21 downward, so that the operator can use less force to operate the force-applying protrusion 33 to drive the hook 3 to rotate and disassemble when carrying the hook 3.

[0033] See also Fig.10 A heating component 4 is provided outside the fluid seat 2, and the heating component 4 can heat the glue flowing through the flow channel. A groove 41 is provided in the fluid seat 2 corresponding to the hook 3, and the hook 3 can partially move in the groove 41, and when moving, the hook 3 and the groove 41 provided on the heating component 4 do not interfere with each other.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0035] The above description is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content of the specification, and its technical scope must be determined by the scope of the claims.

Claims

1. A piezoelectric injection valve, characterized in that: The invention comprises a valve body (1), a fluid seat (2), a hook (3) hinged to the valve body (1), a clamping shaft (21) fixed to the fluid seat (2), and an elastic member (313) acting on the hook (3) so that the hook (3) is clamped to the clamping shaft (21), wherein the hook (3) is clamped to the clamping shaft (21) and the fluid seat (2) is fixed to the valve body (1); The hook (3) comprises a holding surface (A) located at the end of the hook groove and an arc-shaped transition surface (B) smoothly transitioning from the holding surface (A) and located at the bottom of the hook groove, the holding surface (A) being tangent to the holding axis (21), and the arc-shaped transition surface (B) being spaced apart from the holding axis (21).

2. The piezoelectric injection valve according to claim 1, characterized in that When the contact portion between the clamping surface (A) and the clamping shaft (21) is worn, the clamping hook (3) rotates in the direction of the clamping shaft (21) under the action of the elastic member (313), and simultaneously drives the non-worn portion of the clamping surface (A) to be tangent to the clamping shaft (21), and the distance between the arc-shaped transition surface (B) and the clamping shaft (21) is reduced.

3. The piezoelectric injection valve according to claim 1, characterized in that The hinge point (O1) of the hook and the center point (O2) of the hook shaft are located on the same vertical axis.

4. The piezoelectric injection valve according to claim 3, characterized in that The hinge point (O1) of the hook (3) is located above the center point (O2) of the clamping shaft, so that the hook (3) naturally droops under the action of its gravity and is suitable for clamping with the clamping shaft (21).

5. The piezoelectric injection valve according to claim 1, characterized in that The valve body (1) comprises an adjustment seat (31), and the hook (3) is hinged to the adjustment seat (31) and can rotate relative to the adjustment seat (31).

6. The piezoelectric injection valve according to claim 5, characterized in that The adjustment seat (31) has a protruding portion (314) protruding upwards, the hinge point (O1) between the hook (3) and the adjustment seat (31) is located on the protruding portion (314), and the bottom of the valve body (1) is provided with a groove portion (11) that cooperates with the protruding portion (314).

7. The piezoelectric injection valve according to claim 5, characterized in that The number of the hooks (3) is two, and the two hooks (3) are symmetrically arranged on both sides of the adjustment seat (31), and the two symmetrically arranged hooks (3) are fixed by a connecting block (32); the number of the clamping shafts (21) corresponds to the two hooks (3), and the two clamping shafts (21) are symmetrically mounted on the fluid seat (2).

8. The piezoelectric injection valve according to claim 7, characterized in that The elastic member (313) is a torsion spring, and a pin shaft (312) for mounting the torsion spring is provided on the adjustment seat (31). One button arm of the torsion spring acts on the adjustment seat (31), and the other torsion arm of the torsion spring acts on the connection block (32).

9. The piezoelectric injection valve according to claim 7, characterized in that The elastic member (313) is a tension spring, one end of which is fixed on the adjustment seat (31), and the other end of which is fixed on the hook (3).

10. The piezoelectric injection valve according to claim 9, characterized in that Both of the hooks (3) may be provided with a force-applying protrusion (33).

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