Novel multi-layer structure teflon diaphragm assembly

Abstract

The utility model discloses a novel multi-layer structure teflon diaphragm component, which comprises a first diaphragm group and a second diaphragm group, the first diaphragm group comprises a front pressing plate and a first diaphragm, the second diaphragm group comprises a reinforcing plate and a second diaphragm, and the first diaphragm and the second diaphragm are mutually abutted and attached; teflon layers wrap the front pressing plate and the reinforcing plate, threaded rods are integrally arranged in the middle of the front pressing plate, threaded holes are formed in the middle of the reinforcing plate, and the first diaphragm and the second diaphragm are fixed through matched threaded connection of the threaded rods. The diaphragm assembly comprises the two layers of diaphragms, the first diaphragm and the second diaphragm are fixed through screw joint matching of the front pressing plate and the reinforcing plate, and the front pressing plate and the reinforcing plate are the metal pieces coated with the polytetrafluoroethylene layers, so that the corrosion resistance of the diaphragm assembly is improved, the stability of the diaphragm is guaranteed, the service life of the diaphragm assembly is prolonged, and the service life of the diaphragm assembly is prolonged. The phenomenon that a single diaphragm is prone to fatigue or tearing in the using process is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of diaphragm pumps, and in particular relates to a novel multi-layered polytetrafluoroethylene diaphragm component. Background Art

[0002] The diaphragm pump consists of three parts: the motor, the transmission box, and the cylinder body. The working principle of the diaphragm pump: the motor drives the worm through the coupling and the main shaft and the eccentric wheel rotate through the worm gear reduction, and the eccentric wheel drives the connecting rod to reciprocate in the guide cylinder. The connecting rod drives the diaphragm, and through the action of the one-way valve, a vacuum is gradually formed in the pump chamber, the suction valve opens, and the liquid is sucked in; when the diaphragm moves forward, the suction valve closes, the discharge valve opens, and the liquid is discharged under the push of the diaphragm. The diaphragm pump forms a continuous, pressurized, and quantitative discharge of liquid by adjusting the reciprocating work of a certain stroke, and relies on the back and forth agitation of the diaphragm to change the volume of the studio to suck people and discharge liquid. The diaphragm is the main component of the diaphragm pump product. It is a special dynamic seal. The diaphragm needs to have good acid and alkali resistance and corrosion resistance.

[0003] In existing diaphragm pumps, due to repeated deformation of the diaphragm, fatigue or diaphragm tearing is likely to occur. In addition, the diaphragms are all single-piece structures that are relatively thin. Under the reciprocating transmission of the connecting rod mechanism or high pressure conditions, fatigue wear is likely to occur, affecting the reliability of the connection between the diaphragm and the connecting rod mechanism, and reducing the service life of the diaphragm pump. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a novel multi-layer structured polytetrafluoroethylene diaphragm assembly. By combining a metal piece coated with a polytetrafluoroethylene layer with two or more layers of diaphragms, the structure of the diaphragm assembly is made more firm and stable, the corrosion resistance of the diaphragm assembly is enhanced, and its service life is increased.

[0005] The novel multi-layer polytetrafluoroethylene diaphragm assembly is arranged between the pump head and the connecting rod of the diaphragm pump, and the diaphragm assembly includes a first diaphragm group and a second diaphragm group, the first diaphragm group includes a front pressure plate and a first diaphragm, the second diaphragm group includes a reinforcing plate and a second diaphragm, the first diaphragm and the second diaphragm are abutted against each other; the front pressure plate and the reinforcing plate are both covered with a polytetrafluoroethylene layer, a threaded rod is integrally arranged in the middle of the front pressure plate, and a threaded hole is arranged in the middle of the reinforcing plate, and the first diaphragm and the second diaphragm are fixed by screwing the threaded rod together.

[0006] Furthermore, the first diaphragm and the second diaphragm have the same structure and are both polytetrafluoroethylene diaphragms.

[0007] Furthermore, a third diaphragm is arranged between the first diaphragm and the second diaphragm. The third diaphragm has the same structure as the first diaphragm and the second diaphragm, and is a disc-shaped structure.

[0008] Furthermore, the polytetrafluoroethylene diaphragm is a disc-shaped structure, including a central portion, a connecting portion and an outer end portion, wherein the central portion abuts against the end surface of the front pressure plate or the reinforcing plate, and a central hole is provided in the central portion to cooperate with the threaded rod, and a plurality of sealing grooves are concentrically provided around the central hole to cooperate with the polytetrafluoroethylene layer.

[0009] Furthermore, the central portion and the outer end portion are in the same plane, and the connecting portion is an arc-shaped curved surface that is recessed toward one side of the reinforcing plate.

[0010] Furthermore, a plurality of mounting grooves are arranged on the front pressure plate and the reinforcing plate, and are engaged with the clamping parts arranged on the polytetrafluoroethylene layer.

[0011] Furthermore, the front pressure plate and the reinforcement plate are metal parts.

[0012] Furthermore, the front pressure plate and the reinforcing plate are coaxially arranged, and the outer diameter and thickness of the reinforcing plate are larger than those of the front pressure plate.

[0013] Compared with the prior art, the utility model has the following advantages: the diaphragm assembly in the present application includes a double-layer diaphragm, the first diaphragm and the second diaphragm are fixed by screwing the front pressure plate and the reinforcement plate, and the front pressure plate and the reinforcement plate are metal parts coated with a polytetrafluoroethylene layer, which not only increases the corrosion resistance of the diaphragm assembly, but also ensures the stability of the diaphragm, increases the service life of the diaphragm assembly, and avoids the phenomenon of fatigue or diaphragm tearing of the single-piece diaphragm during use. In addition, the present application can add a third diaphragm between the first diaphragm and the second diaphragm according to the usage scenario to increase the firmness of the diaphragm assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the diaphragm assembly of the utility model;

[0015] Figure 2 It is a side view of the diaphragm assembly of the utility model;

[0016] Figure 3 For this utility model Figure 2 Middle AA section view;

[0017] Figure 4 This is a side view of the diaphragm assembly of the utility model (three-layer diaphragm structure);

[0018] Figure 5 For this utility model Figure 4 Middle BB section view.

[0019] In the figure: 1-first membrane group, 11-front pressure plate, 12-first membrane, 13-threaded rod, 2-second membrane group, 21-reinforcement plate, 22-second membrane, 3-third membrane, 4-PTFE layer, 41-clamp, 5-sealing groove. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the present invention is further described below in conjunction with the accompanying drawings.

[0021] like Figure 1-Figure 3 As shown, a novel multi-layer polytetrafluoroethylene diaphragm assembly is arranged between the pump head and the connecting rod of the diaphragm pump, the diaphragm assembly includes a first diaphragm group 1 and a second diaphragm group 2, the first diaphragm group 1 includes a front pressure plate 11 and a first diaphragm 12, the second diaphragm group 2 includes a reinforcing plate 21 and a second diaphragm 22, the first diaphragm 12 and the second diaphragm 22 are in contact with each other; the front pressure plate 11 and the reinforcing plate 21 are both covered with a polytetrafluoroethylene layer 4, a threaded rod 13 is integrally provided in the middle of the front pressure plate 11, and a threaded hole 23 is provided in the middle of the reinforcing plate 21, and the first diaphragm 12 and the second diaphragm 22 are fixed by screwing the threaded rods 13 and the threaded rods 13 together.

[0022] Specifically, the first diaphragm 12 and the second diaphragm 22 have the same structure and are both polytetrafluoroethylene diaphragms. The polytetrafluoroethylene diaphragm is a disc-shaped structure, including a central portion, a connecting portion and an outer end portion. The central portion abuts against the end face of the front pressure plate 11 or the reinforcing plate 21, and the central portion is provided with a central hole that cooperates with the threaded rod 13, and a number of sealing grooves 5 are concentrically arranged around the central hole to cooperate with the polytetrafluoroethylene layer 4 to enhance the friction between the end faces of the diaphragm and the polytetrafluoroethylene layer 4 and improve the sealing performance. The central portion and the outer end portion are in the same plane, and the connecting portion is an arc-shaped curved surface that is concave toward one side of the reinforcing plate 21. Therefore, in order to ensure the stability of the first diaphragm 12 and the second diaphragm 22, the outer diameter and thickness of the reinforcing plate 21 are slightly larger than the front pressure plate 11.

[0023] In this embodiment, the front pressing plate 11 and the reinforcing plate 21 are coaxially arranged, and the front pressing plate 11 and the reinforcing plate 21 are metal parts, preferably iron core or steel core. In order to ensure the stability of the connection between the front pressing plate 11 and the reinforcing plate 21 and the polytetrafluoroethylene layer 4, a plurality of mounting grooves are arranged on the front pressing plate 11 and the reinforcing plate 21, and are engaged with the clamping parts 41 arranged on the polytetrafluoroethylene layer 4.

[0024] like Figure 4 and Figure 5 As shown, in the use scenario of high speed or large flow, in order to increase the stability and firmness of the diaphragm assembly, a third diaphragm 3 is arranged between the first diaphragm 12 and the second diaphragm 22, and the third diaphragm 3 has the same structure and size as the first diaphragm 12 and the second diaphragm 22; that is, the third diaphragm 3 is a disc-shaped structure, including a central portion, a connecting portion and an outer end portion, the central portion is provided with a center hole that cooperates with the threaded rod 13, and the connecting portion is an arc-shaped surface that is recessed toward one side of the second diaphragm 22.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A new type of multi-layer structure polytetrafluoroethylene diaphragm assembly, arranged between the pump head and the connecting rod of the diaphragm pump, characterized in that: The diaphragm assembly comprises a first diaphragm group (1) and a second diaphragm group (2), the first diaphragm group (1) comprises a front pressure plate (11) and a first diaphragm (12), the second diaphragm group (2) comprises a reinforcement plate (21) and a second diaphragm (22), the first diaphragm (12) and the second diaphragm (22) being in contact with each other; the front pressure plate (11) and the reinforcement plate (21) are both covered with a polytetrafluoroethylene layer (4), a threaded rod (13) is integrally provided in the middle of the front pressure plate (11), and a threaded hole (23) is provided in the middle of the reinforcement plate (21), and the first diaphragm (12) and the second diaphragm (22) are fixed by screwing the threaded rods (13) and the threaded rods (13) together.

2. A novel multi-layered polytetrafluoroethylene diaphragm assembly according to claim 1, characterized in that: The first diaphragm (12) and the second diaphragm (22) have the same structure and are both polytetrafluoroethylene diaphragms.

3. A novel multi-layered polytetrafluoroethylene diaphragm assembly according to claim 2, characterized in that: A third diaphragm (3) is arranged between the first diaphragm (12) and the second diaphragm (22); the third diaphragm (3) has the same structure as the first diaphragm (12) and the second diaphragm (22), and is a disc-shaped structure.

4. A novel multi-layered polytetrafluoroethylene diaphragm assembly according to claim 2, characterized in that: The polytetrafluoroethylene diaphragm is a disc-shaped structure, comprising a central portion, a connecting portion and an outer end portion, wherein the central portion abuts against the end surface of the front pressure plate (11) or the reinforcing plate (21), and a central hole is provided in the central portion to cooperate with the threaded rod (13), and a plurality of sealing grooves (5) are concentrically provided around the central hole to cooperate with the polytetrafluoroethylene layer (4).

5. A novel multi-layered polytetrafluoroethylene diaphragm assembly according to claim 4, characterized in that: The central portion and the outer end portion are located in the same plane, and the connecting portion is an arc-shaped curved surface that is recessed toward one side of the reinforcing plate (21).

6. A novel multi-layer polytetrafluoroethylene diaphragm assembly according to any one of claims 1 to 5, characterized in that: The front pressure plate (11) and the reinforcing plate (21) are provided with a plurality of mounting grooves, which cooperate with the clamping parts (41) provided on the polytetrafluoroethylene layer (4) for clamping.

7. A novel multi-layered polytetrafluoroethylene diaphragm assembly according to claim 6, characterized in that: The front pressure plate (11) and the reinforcement plate (21) are metal parts.

8. A novel multi-layered polytetrafluoroethylene diaphragm assembly according to claim 6, characterized in that: The front pressing plate (11) and the reinforcing plate (21) are coaxially arranged, and the outer diameter and thickness of the reinforcing plate (21) are both greater than those of the front pressing plate (11).

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