A diaphragm for a hydraulic diaphragm pump and the hydraulic diaphragm pump.

Abstract

This utility model discloses a diaphragm sheet for a hydraulic diaphragm pump and a hydraulic diaphragm pump. The diaphragm sheet includes a diaphragm body, which is disc-shaped. The diaphragm body includes, from the outside to the inside, a pressure sealing part, a reinforcing part, and a central part. The reinforcing part is located between the pressure sealing part and the central part. The reinforcing part includes several annular raised structures arranged concentrically with the diaphragm body. The edges of the raised structures of the reinforcing part are interconnected. The cross-section of the reinforcing part is wavy. The raised side of the raised structure of the reinforcing part faces the pumping chamber of the hydraulic diaphragm pump. This design greatly increases the elastic deformation deflection of the diaphragm, giving it a larger deformation margin, alleviating the pressure reaching the material limit, effectively adapting to high-pressure conditions, and improving service life. At the same time, under constant stroke, the contact area between the diaphragm and the medium increases significantly after deformation, allowing for the delivery of a larger flow rate without changing the diaphragm clamping diameter (pressure-bearing diameter).

Description

Technical Field

[0001] This utility model relates to the field of liquid conveying equipment technology, and in particular to a diaphragm sheet for a hydraulic diaphragm pump and a hydraulic diaphragm pump. Background Technology

[0002] Hydraulic diaphragm pumps are a type of reciprocating positive displacement pump that achieves liquid transport by periodically changing the volume of its working chamber. The hydraulic end of the diaphragm pump forms the working chamber via a diaphragm. The linear reciprocating motion of the plunger (piston) is transmitted to the diaphragm via hydraulic oil, transforming it into periodic elastic deformation of the diaphragm and causing volume changes within the working chamber.

[0003] Existing diaphragms typically use flat sheet membranes made of flexible materials (engineering plastics, rubber, etc.). In order to ensure the strength and fatigue life of the diaphragm, the elastic deformation deflection of the diaphragm is generally small. In addition, due to the limitations of machine size and the low reciprocating speed of diaphragm pumps in actual production applications, the flow rate of diaphragm pumps is usually not very large.

[0004] Due to the structural design of diaphragm pumps, the clearance volume is relatively large. Apart from factors related to the pump chamber geometry, the flat diaphragm, limited by its shape and deformation, makes it difficult to completely conform to the chamber wall when the plunger reaches the front dead center. Furthermore, the pump needs to overcome additional resistance from diaphragm deformation during suction. These factors result in incomplete discharge of the diaphragm pump, affecting its suction performance and volumetric efficiency.

[0005] Under high pressure conditions, due to uneven stress distribution at the edges, excessive local stress, and increased reciprocating deformation of the diaphragm, material fatigue is accelerated, and the diaphragm sealing area is prone to rupture.

[0006] Therefore, the use of flat sheet diaphragms is very limited under high flow and high pressure conditions. This utility model aims to make the diaphragm suitable for high pressure and high flow conditions by changing the diaphragm structure while keeping the diaphragm material unchanged. Summary of the Invention

[0007] To solve the above-mentioned technical problems, this utility model provides a diaphragm sheet for a hydraulic diaphragm pump and a hydraulic diaphragm pump. By combining the pressure sealing part, the corrugated reinforcing part and the central part, the elastic deformation deflection of the diaphragm is greatly increased, giving it a larger deformation margin, relieving the pressure reaching the material limit, effectively adapting to high-pressure working conditions, and improving service life. At the same time, under constant stroke, the contact area between the diaphragm and the medium increases significantly after deformation, and a larger flow rate can be delivered without changing the diaphragm clamping diameter (pressure-bearing diameter).

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] On one hand, a diaphragm sheet for a hydraulic diaphragm pump is provided. The diaphragm sheet includes a diaphragm body, which is disc-shaped. The diaphragm body includes, from the outside to the inside, a sealing portion, a reinforcing portion, and a central portion. The reinforcing portion is located between the sealing portion and the central portion. The reinforcing portion includes several annular raised structures arranged concentrically with the diaphragm body. The edges of each raised structure of the reinforcing portion are connected to each other. The cross-section of the reinforcing portion is wavy. The raised side of the raised structure of the reinforcing portion faces the pumping chamber of the hydraulic diaphragm pump.

[0010] In a preferred embodiment of this utility model, the connection between the reinforcing part and the sealing part and the center part adopts an arc-shaped transition.

[0011] In a preferred embodiment of the present invention, the edges of the various raised structures of the reinforcing part are connected by a rounded transition.

[0012] In a preferred embodiment of the present invention, the reinforcing portion includes at least two annular raised structures arranged concentrically with the diaphragm body.

[0013] In a preferred embodiment of this utility model, the thickness of the sealing portion and the central portion is greater than that of the reinforcing portion.

[0014] In a preferred embodiment of the present invention, the edges of each raised structure of the reinforcing part are flush with the bottom surface of the sealing part and the center part.

[0015] In a preferred embodiment of this utility model, the diaphragm is made of PTFE or rubber.

[0016] On the other hand, a hydraulic diaphragm pump is provided, wherein the diaphragm of the hydraulic diaphragm pump adopts the diaphragm described in any of the above embodiments.

[0017] The beneficial effects of this utility model are as follows:

[0018] First, the overall structure is simple and effective, which greatly increases the elastic deformation deflection of the diaphragm, giving it a larger deformation margin, relieving the pressure that reaches the material limit, effectively adapting to high-pressure working conditions, and improving service life (limited number of cycles).

[0019] Second, under constant stroke conditions, the contact area between the diaphragm and the medium increases significantly after deformation, allowing for the delivery of a larger flow rate without changing the diaphragm clamping diameter (pressure diameter).

[0020] Third, during the suction process, the diaphragm deforms and fits more tightly against the pump cavity wall, promoting effective drainage and improving the pump's metering accuracy and volumetric efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a diaphragm sheet for a hydraulic diaphragm pump, provided in one embodiment of the present invention.

[0022] Figure 2 A front view of a diaphragm sheet for a hydraulic diaphragm pump provided in an embodiment of this utility model.

[0023] Figure 3 for Figure 2 Cross-sectional view at point AA. Detailed Implementation

[0024] The present invention will be further described clearly and in detail below with reference to specific embodiments and accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention. Unless otherwise specified, the methods briefly described in the embodiments of the present invention are methods mastered by those skilled in the art.

[0025] like Figure 1 As shown Figure 3 In the same embodiment provided by this utility model, a diaphragm sheet for a hydraulic diaphragm pump is provided. The diaphragm sheet includes a diaphragm body 1, which is disc-shaped. The diaphragm body 1 includes a sealing part 11, a reinforcing part 12, and a central part 13 from the outside to the inside. The reinforcing part 12 is located between the sealing part 11 and the central part 13. The reinforcing part 12 includes several annular raised structures 14 arranged concentrically with the diaphragm body 1. The edges of each raised structure 14 of the reinforcing part 12 are connected to each other. The cross-section of the reinforcing part 12 is wavy. The raised side of the raised structure 14 of the reinforcing part 12 faces the pumping chamber of the hydraulic diaphragm pump.

[0026] Specifically, in this embodiment, the reinforcing part 12 of the diaphragm body 1 includes four concentrically arranged annular raised structures 14. Due to the presence of the raised structures 14, the elastic deformation deflection of the diaphragm is greatly increased, giving the diaphragm a larger deformation margin. During the operation of the diaphragm pump, the existing flat diaphragms generally have a small elastic deformation deflection in order to ensure the strength and fatigue life of the diaphragm. However, this utility model increases the elastic deformation deflection of the diaphragm sheet through the raised structures 14 of the reinforcing part 12. When the diaphragm is compressed, the raised structures 14 are released, which can significantly increase the contact area between the diaphragm and the medium after deformation under constant stroke. This allows for the delivery of a larger flow rate without changing the diaphragm clamping diameter (compression diameter). During suction, the reinforcing part 12 of the diaphragm can be transformed back into the raised structure 14 with a wavy cross section and deform in the opposite direction. This accommodates the deformation margin of the diaphragm and allows it to fit more tightly against the pump cavity wall after deformation, promoting effective drainage and improving the pump's metering accuracy and volumetric efficiency.

[0027] In a preferred embodiment of the present invention, the connection between the reinforcing part 12 and the sealing part 11 and the central part 13 is made in an arc shape.

[0028] In a preferred embodiment of the present invention, the edges of each raised structure 14 of the reinforcing part 12 are connected by a rounded transition.

[0029] The use of a rounded transition avoids stress concentration during operation and improves the durability of the diaphragm.

[0030] In a preferred embodiment of the present invention, the reinforcing part 12 includes at least two annular raised structures 14 arranged concentrically with the diaphragm body 1.

[0031] In a preferred embodiment of this invention, the thickness of the sealing portion 11 and the central portion 13 is greater than that of the reinforcing portion 12. The greater thickness of the diaphragm sealing portion makes it less prone to wrinkling and deformation during clamping, thereby preventing localized stress concentration under high-pressure conditions that could lead to diaphragm rupture.

[0032] In a preferred embodiment of this invention, the edges of each raised structure 14 of the reinforcing portion 12 are flush with the bottom surfaces of the sealing portion 11 and the central portion 13. A flush bottom surface facilitates diaphragm installation.

[0033] In a preferred embodiment of this utility model, the diaphragm is made of PTFE or rubber.

[0034] More specifically, this embodiment provides a diaphragm for a hydraulic diaphragm pump, which is installed in the working chamber of the diaphragm pump by a pressure sealing part 11. When the diaphragm pump pumps out, the piston plunger moves to the front dead center, and the diaphragm is gradually pressed towards the pumping chamber of the working chamber of the diaphragm pump. Due to the presence of the reinforcing part 12, the raised structure 14 is gradually deformed and stretched open, increasing the contact area of ​​the diaphragm. Under the same stroke, a larger flow rate can be pumped. At the same time, when the piston plunger moves to the front dead center, the diaphragm can completely fit the cavity wall of the working chamber through deformation, making the drainage more thorough. During the suction process, the diaphragm can fit more tightly against the pump cavity wall after deformation, promoting effective drainage and improving the pump's metering accuracy and volumetric efficiency. It should be noted that traditional flat diaphragms typically have small elastic deformation deflection. Under high-pressure conditions, they are very prone to rupture due to uneven stress distribution at the edges, excessive local stress, increased reciprocating deformation of the diaphragm, and accelerated material fatigue. The reinforcing structure used in this application essentially provides a buffer zone for the diaphragm to withstand pressure. Under high-pressure conditions, the pressure on the diaphragm will first gradually cause deformation of the various raised structures 14 of the reinforcing part 12. At the same time, due to the deformation of the raised structures 14, the diaphragm will be in close contact with the working chamber wall when it is fully expanded, thus forming a stress relief. This greatly improves the high-pressure bearing capacity of the diaphragm and makes it better adaptable to high-pressure conditions.

[0035] On the other hand, a hydraulic diaphragm pump is provided, wherein the diaphragm of the hydraulic diaphragm pump adopts the diaphragm described in any of the above embodiments.

[0036] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A diaphragm for a hydraulic diaphragm pump, characterized in that, The diaphragm sheet includes a diaphragm body (1), which is disc-shaped. The diaphragm body (1) includes a sealing part (11), a reinforcing part (12), and a central part (13) from the outside to the inside. The reinforcing part (12) is located between the sealing part (11) and the central part (13). The reinforcing part (12) includes several annular raised structures (14) arranged concentrically with the diaphragm body (1). The edges of each raised structure (14) of the reinforcing part (12) are connected to each other. The cross-section of the reinforcing part (12) is wavy. The raised side of the raised structure (14) of the reinforcing part (12) faces the pumping chamber of the hydraulic diaphragm pump.

2. The diaphragm sheet for a hydraulic diaphragm pump according to claim 1, characterized in that, The thickness of the sealing portion (11) and the central portion (13) is greater than that of the reinforcing portion (12).

3. The diaphragm sheet for a hydraulic diaphragm pump according to claim 1, characterized in that, The edges of each raised structure (14) of the reinforcing part (12) are flush with the bottom surface of the sealing part (11) and the center part (13).

4. The diaphragm sheet for a hydraulic diaphragm pump according to claim 1, 2, or 3, characterized in that, The reinforcing part (12) includes at least two annular raised structures (14) arranged concentrically with the diaphragm body (1).

5. The diaphragm sheet for a hydraulic diaphragm pump according to claim 4, characterized in that, The connection between the reinforcing part (12) and the sealing part (11) and the center part (13) adopts an arc-shaped transition.

6. The diaphragm for a hydraulic diaphragm pump according to claim 5, characterized in that, The edges of each raised structure (14) of the reinforced part (12) are connected by a rounded transition.

7. The diaphragm sheet for a hydraulic diaphragm pump according to claim 5 or 6, characterized in that, The diaphragm is made of PTFE or rubber.

8. A hydraulic diaphragm pump, characterized in that, The diaphragm of the hydraulic diaphragm pump is the diaphragm described in any one of claims 1-7.

Images