Multi-section self-pressure-limiting type diaphragm coupling

Abstract

The utility model relates to a multi-section self-pressure-limiting type diaphragm coupling, which is formed by connecting a plurality of diaphragms and is made of elastic rubber, each diaphragm is bowl-shaped and consists of a sealing edge, a fixed edge, a diaphragm bowl, a buffer cushion, an operating handle and an end socket which are integrated; the diaphragm bowl is a main body part of the diaphragm and is bowl-shaped, and the bowl edge part of the diaphragm bowl is provided with the annular sealing edge and extends outwards to form the planar fixing edge; a buffer pad, an operating handle and a sealing head are sequentially arranged outside the bottom of the box body; the plane of the fixed edge is basically vertical to the axis of the bowl-shaped diaphragm; a flexible folding ring is arranged on the bowl wall of the diaphragm bowl, the folding ring is one of forming parts of the bowl wall, is annular and is basically perpendicular to the axis of the diaphragm bowl, and the wall thickness of the folding ring is smaller than the wall thickness of other parts, adjacent to the folding ring, of the bowl wall. In the plurality of diaphragms, there is a difference in folding rings, i.e., the folding rings of at least one diaphragm are different from the folding rings of other diaphragms.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of diaphragm unions of multi-section self-limiting pressure, more specifically, a kind of diaphragm union for micro diaphragm pump, can be automatically changed characteristic pressure curve according to working pressure. BACKGROUND

[0002] With the maturity and popularity of vacuum technology, the application field of vacuum generator products expands from food preservation, clothing compression storage and other fields to other fields. For example, compressed tea bags, compressed dried vegetable bags, medicine packaging, small food sub-packaging with single-person single-meal as the measurement unit, and small-capacity negative pressure experiments with high pressure accuracy requirements.

[0003] The biggest common feature and technical requirement of emerging application fields is: small volume, short vacuum formation time, large number of operations, certain requirements for negative pressure accuracy, etc. Or, the accuracy requirement of negative pressure is prioritized over the speed requirement of negative pressure formation.

[0004] Obviously, although the traditional vacuum generator can be used in emerging fields, it is a big car for a small job in terms of volume, and the flow index is too large, which will cause the pressure acceleration in the working chamber to be too large, causing the sensor and actuator response speed to be slower than the negative pressure formation speed, and the final pressure control error of the working chamber to be large and unbalanced. In batch work, it is inevitable to cause too large performance dispersion between products.

[0005] Based on such needs, the traditional technology uses a micro diaphragm pump as a pressure source, but in the traditional diaphragm pump technology, the multiple diaphragm structures are consistent, and the pressure output is a single continuous curve. As mentioned above, it cannot meet the above needs well. SUMMARY

[0006] The utility model provides a kind of diaphragm union of multi-section self-limiting pressure to solve the prior art problems in view of the limitations and market demand of traditional technology.

[0007] According to actual needs, one or more embodiments of the present specification provide a kind of diaphragm union of multi-section self-limiting pressure, solve the limitations and defects existing in the current technology listed in the background art, and provide a practical solution. The technical scheme of the utility model is as follows:

[0008] The diaphragm union of multi-section self-limiting pressure provided by the utility model is made of multiple diaphragm connections and is made of elastic rubber. Each diaphragm is bowl-shaped and consists of an integrated sealing edge, a fixed edge, a diaphragm bowl, a buffer pad, an operating handle and a head.

[0009] The diaphragm bowl is the main part of the diaphragm and is bowl-shaped. The bowl edge part is provided with a ring-shaped sealing edge and extends outward to a flat fixed edge. The outer side of the bottom is sequentially provided with a buffer pad, an operating handle and a head.

[0010] The fixed edge is substantially perpendicular to the axis of the bowl-shaped diaphragm.

[0011] The diaphragm bowl is provided with a flexible folding ring on the bowl wall, the folding ring is one of the components of the bowl wall, is annular, is substantially perpendicular to the axis of the diaphragm bowl, and the wall thickness is thinner than the wall thickness of other parts adjacent to the folding ring on the bowl wall.

[0012] Among the plurality of diaphragms, there is a folding difference, that is, the folding ring of at least one diaphragm is different from the folding ring of other diaphragms.

[0013] As a further technical solution, the folding ring difference is that the thickness or height of the folding ring is different.

[0014] As a further technical solution, the folding ring difference is that the number of the folding ring is different.

[0015] As a further technical solution, the folding ring difference is a combination of the thickness or height of the folding ring being different and the number of the folding ring being different.

[0016] The beneficial effects of the embodiment of the utility model are as follows:

[0017] 1) Without increasing parts, the pressure characteristics of each diaphragm can be changed by optimizing the structure of the diaphragm, so that the output pressure characteristics of the diaphragm pump are changed.

[0018] 2) The diaphragm pump is given a working point with sudden change of pressure output characteristics, and when the output pressure reaches a threshold value, the output pressure deviates from the output pressure characteristics of the diaphragm pump in the conventional technology, so as to meet the specific use requirement.

[0019] 3) The output pressure of the diaphragm pump has multiple working points with sudden change through the combination of the diaphragm structure, so that the diaphragm pump has more flexible control characteristics.

[0020] 4) The diaphragm pump realizes automatic pressure adjustment through its mechanical structure, avoids the pressure overshoot phenomenon caused by response hysteresis in the electronic closed-loop control scheme, and has better control accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described below in combination with the drawings and examples, and the drawings are as follows:

[0022] Figure 1 The structure diagram of the one-third soft variable diaphragm connection with single threshold value is shown.

[0023] Figure 2 The structure diagram of the three-cavity driving head in the diaphragm pump is shown. DETAILED DESCRIPTION

[0024] Example 1 – One-third soft variable diaphragm connection with single threshold

[0025] like Figure 1 As shown, the single-threshold one-third soft-variable diaphragm link 1 (hereinafter referred to as "diaphragm link 1") is a three-diaphragm structure, which is integrally formed by a symmetrically arranged first diaphragm 11, second diaphragm 12, and third diaphragm 13, and is made of elastic rubber. Among them:

[0026] The first diaphragm 11 is provided with a first fixed edge 111, a first sealing edge 112, a first A-layer bowl wall 113, a first A-layer folding ring 114, a first B-layer bowl wall 115, a first B-layer folding ring 116, a first bottom bowl wall 117, a first buffer pad 118, a first operating handle 119, a first end cap 11a, etc.

[0027] The second diaphragm 12 is provided with a second fixed edge 121, a second sealing edge 122, a second A-layer bowl wall 123, a second folding ring 124, a second bottom layer bowl wall 127, a second buffer pad 128, a second operating handle 129, a second end cap 12a, etc.

[0028] The third diaphragm 13 is provided with a third fixed edge 131, a third sealing edge 132, a third A-layer bowl wall (not shown due to angle), a third folding ring 134, a third B-layer bowl wall (not shown due to angle), a third bottom bowl wall 137, a third buffer pad (not shown due to angle), a third operating handle (not marked), and a third end cap 13a, etc.

[0029] The thickness of each of the aforementioned folded rings is thinner than the wall of each bowl.

[0030] To illustrate the working principle of diaphragm unit 1, Figure 2 The structure of the three-chamber drive head 2 (hereinafter referred to as "drive head 2") in the diaphragm pump is illustrated. Figure 2 As shown, the drive head 2 is a symmetrical three-jaw structure, consisting of three symmetrically arranged drive claws 21, a gripping hole 22 at the end of the drive claw 21, a bushing 23 at the center, and a shaft 24.

[0031] After assembly, the first operating handle 119, the second operating handle 129, and the third operating handle 139 of the diaphragm unit 1 are respectively embedded into the three gripping holes 22 of the drive head 2. The gripping holes 22 are sealed by the first end cap 11a, the second end cap 12a, and the third end cap 13a, respectively, to prevent the operating handles from detaching from the gripping holes 22.

[0032] When the diaphragm is axially pressed by the driving head 2, the folded rings deform preferentially to the bowl walls, causing the underlying bowl walls to fold over the A-layer bowl walls, compressing the inner cavity of the diaphragm and reducing its volume, and the fluid therein is forced out; conversely, when the diaphragm is axially pulled by the driving head 2, the underlying bowl walls move away from the A-layer bowl walls, increasing the volume of the inner cavity of the diaphragm and creating a driving force to draw in fluid.

[0033] In operation, the driving head 2 is cyclically driven by a motor or other power mechanism, and pushes and pulls each operating handle along the axial direction of the diaphragm in turn. The underlying bowl walls of the first diaphragm 11, the second diaphragm 12, and the third diaphragm 13 are sequentially folded over or moved away from the A-layer bowl walls, and the volumes of the first diaphragm cavity 110, the second diaphragm cavity 120, and the third diaphragm cavity 130 are cyclically changed, driving the fluid in and out. With the cooperation of the fixed edges 1x1, the sealing edges 1x2, and the one-way valves (not shown) in the diaphragm pump, a one-way driving force is generated on the fluid.

[0034] In this embodiment, the bowl walls of the first diaphragm 11 are provided with a first A-layer folded ring 114 and a first B-layer folded ring 116, i.e., two layers of folded rings, one more than the bowl walls of the other two diaphragms. Therefore, in operation, when the pressure difference between the input and output of the diaphragm pump is small, the characteristics of the three diaphragms are similar, and the characteristics of the diaphragm pump of the prior art are similar; when the pressure difference between the input and output of the diaphragm pump reaches a certain value, the first diaphragm 11 begins to exhibit characteristics that are significantly different from those of the other two diaphragms, i.e., the pressure characteristics become soft, and compared with the diaphragm pump of the prior art, the pressure characteristics of the present embodiment become soft at this operating point.

[0035] Since the driving speed of a commonly used micro diaphragm pump is above 1500 rpm, i.e., if the pressure difference between the input and output of the diaphragm pump reaches a threshold value, the output pressure characteristics become soft automatically within 40 ms (1 minute ÷ 1500 = 40 ms) at the minimum speed of 1500 rpm in the present embodiment. If a sensor + actuator scheme is used to adjust the output characteristics, the response time of the pressure sensor circuit is much longer than 40 ms in general due to necessary processing such as filtering, and the speed of the actuator (e.g., a common voltage speed-adjusting motor) also needs to be adjusted, which requires a certain response time of the actuator. It can be seen that the present embodiment has a significant advantage over the prior art in terms of response speed when the pressure reaches the threshold value.

[0036] At the same time, the upper limit of the pressure of the diaphragm pump of the prior art does not decrease significantly after the speed is reduced, only the response time is longer.

[0037] Therefore, the scheme of feedback by the pressure sensor in the prior art cannot solve the problems described in the section of “BACKGROUND” of the present application. The present embodiment solves the above problems and meets the technical requirements by automatically changing the soft characteristic of the output pressure of the diaphragm pump after the threshold is reached and by fast response speed through the innovation of the mechanical structure.

[0038] In the present embodiment, there is a threshold for the output pressure of the diaphragm pump, that is, there is a working point at which the pressure characteristic of the diaphragm pump changes abruptly.

[0039] In summary, the present embodiment has the following advantages:

[0040] 1) Under the condition of equivalent cost, the diaphragm pump is endowed with the performance of automatic adjustment of the output characteristic;

[0041] 2) The output characteristic of the diaphragm pump is changed to be soft after the threshold and thereafter under the condition of ensuring the output characteristic before the threshold, and the overshoot phenomenon of the output pressure caused by the untimely response of the closed loop is avoided;

[0042] 3) The response time of the closed loop control system is ensured. Embodiment

[0043] a. In another embodiment, for the purpose of comparison, the three-diaphragm structure of embodiment 1 is taken as an example, and two diaphragms are provided with two layers of folding rings, and the other diaphragm is provided with one layer of folding ring.

[0044] This structure can make the output pressure characteristic of the diaphragm pump more flexible after the output pressure reaches the threshold.

[0045] b. In another embodiment, for the purpose of comparison, the three-diaphragm structure of embodiment 1 is still taken as an example, and the three diaphragms are respectively provided with one layer, two layers and three layers of folding rings.

[0046] Such a structure makes the pressure characteristics of the three diaphragms different. That is, there are two thresholds at which the pressure characteristics change abruptly, so that there are more controllable working points for pressure control, which can meet the technical requirements of different application scenarios.

[0047] c. In another embodiment, for the purpose of comparison, the three-diaphragm structure of embodiment 1 is still taken as an example, and the three diaphragms are respectively provided with one layer of folding ring, but the folding ring of one diaphragm (diaphragm A) is thinner than the folding rings of the other two diaphragms.

[0048] This structure makes the pressure characteristic of diaphragm A different from those of the other diaphragms, thereby affecting the output pressure characteristic of the diaphragm pump and making it have one working point at which the pressure characteristic changes abruptly.

[0049] In summary, the multiple embodiments have the following advantages:

[0050] 1) By optimizing the structure of the diaphragm, the pressure characteristics of each diaphragm and the output pressure characteristics of the diaphragm pump can be changed without increasing the number of components;

[0051] 2) The diaphragm pump is given a working point with a sudden change in pressure output characteristics. When the output pressure reaches a threshold value, the output pressure deviates from the output pressure characteristics of the diaphragm pump in the conventional technology, to meet the specific use requirements;

[0052] 3) The output pressure of the diaphragm pump has multiple working points with sudden changes through the combination of diaphragm structures, providing more flexible control characteristics for the diaphragm pump.

[0053] 4) The diaphragm pump realizes automatic pressure regulation through its mechanical structure, avoids the pressure overshoot phenomenon caused by response hysteresis in the electronic closed-loop control scheme, and makes the control accuracy more optimal.

[0054] The above describes specific embodiments of the present specification, and other embodiments are within the scope of the appended claims. In some cases, the structures described in the claims can refer to the above-described specific embodiments to achieve the desired results. Those skilled in the art can easily achieve the desired results by referring to the above-described specific embodiments and their design ideas.

[0055] The above only describes one or more embodiments of the present specification and does not limit the present specification. Those skilled in the art can implement new embodiments by new combinations of the technical of one or more embodiments of the present specification, or can make various modifications and changes. Any modification, equivalent replacement, improvement, technical combination, etc. within the spirit and principles of one or more embodiments of the present specification shall be included in the scope of the claims of the present specification.

Claims

1. A multi-stage self-limiting pressure type diaphragm coupling, characterized in that, The diaphragm is made of elastic rubber, and each diaphragm is bowl-shaped and consists of a sealing edge, a fixed edge, a diaphragm bowl, a buffer pad, a handle and a head. The diaphragm bowl is the main part of the diaphragm and is bowl-shaped, and the bowl edge is provided with the annular sealing edge and extends outwardly to the flat fixed edge. The bottom outer side is sequentially provided with the buffer pad, the handle and the head. The flat surface of the fixed edge is substantially perpendicular to the axis of the bowl-shaped diaphragm. The bowl wall of the diaphragm bowl is provided with a flexible folding ring, which is one of the components of the bowl wall and is annular and substantially perpendicular to the axis of the diaphragm bowl, and the wall thickness is thinner than that of the other parts adjacent to the bowl wall. In the plurality of diaphragms, there is a folding ring difference, that is, the folding ring of at least one diaphragm is different from the folding ring of the other diaphragms.

2. A multi-stage self-limiting pressure diaphragm coupling as claimed in claim 1, wherein, The folding ring difference is that the thickness or height of the folding ring is different.

3. A multi-stage self-limiting pressure diaphragm coupling as claimed in claim 1, wherein, The folding ring difference is that the number of the folding ring is different.

4. A multi-stage self-limiting pressure diaphragm coupling as claimed in claim 1, wherein, The folding ring difference is a combination of the different thickness or height of the folding ring and the different number of the folding ring.

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