Double-layer diaphragm structure and diaphragm pump with same

Abstract

The utility model relates to a double-layer diaphragm structure and a diaphragm pump with the same, the double-layer diaphragm structure comprises an integrally formed double-layer diaphragm body, and the double-layer diaphragm body comprises a first double-layer diaphragm body and a second double-layer diaphragm body. The first sheet body of the double-layer sheet comprises a first sheet body first horizontal part, a first sheet body transition part and a first sheet body second horizontal part which are connected in sequence, and the second sheet body of the double-layer sheet comprises a second sheet body second horizontal part which is connected with the first sheet body second horizontal part; and the height of the second horizontal part of the first sheet body in the vertical direction is lower than that of the first horizontal part of the first sheet body, so that the first sheet body of the double-layer sheet forms a shape which is sunken from the first horizontal part of the first sheet body to the second horizontal part of the first sheet body. According to the diaphragm pump, the phenomena of tension fracture and tearing of the diaphragm can be effectively reduced, so that the service life of the diaphragm and the service life of the diaphragm pump are prolonged, meanwhile, the single flow and the volume efficiency can be increased, and the larger liquid outlet amount and the larger liquid outlet pressure are provided.

Description

Technical Field

[0001] The utility model relates to the field of diaphragm pumps, and particularly relates to a double diaphragm structure and a diaphragm pump with such a structure. Background Art

[0002] A diaphragm pump is a positive-displacement pump that separates the liquid to be transported from the pump cylinder by means of a diaphragm and uses the fluctuation of the diaphragm to achieve the suction and discharge of the liquid. Diaphragm pumps are mainly divided into plunger diaphragm pumps, hydraulic diaphragm pumps, and pneumatic diaphragm pumps. Regardless of the power form of the diaphragm pump, the diaphragm is one of the important components. Parameters such as the fluctuation stroke and lifespan of the diaphragm affect the corresponding characteristics of the diaphragm pump. For a plunger diaphragm pump, in the prior art, the cross-sectional area of the piston is much smaller than that of the diaphragm. When the piston moves up and down to drive the diaphragm to fluctuate, there is direct hard contact between the periphery of the piston end face and the corresponding position of the diaphragm, and this position of the diaphragm is continuously bent back and forth, so that the diaphragm is easily torn or split at this place. For example, a radial diaphragm pump disclosed in Chinese Patent Application CN117489570A includes a pump unit, the number of the pump units is multiple and is used for independently transporting fluids; an annular pipe body, the number of the annular pipe bodies is two and is connected to the multiple pump units. One side of the annular pipe body communicates with the inlets of the multiple pump units, and the other side of the annular pipe body communicates with the outlets of the multiple pump units. A fluid interface is provided on the annular pipe body, and the annular pipe body includes multiple single pipe bodies connected end to end; the pump unit includes a cylinder block, a piston, a diaphragm, and a connecting rod. Specifically, the eccentric shaft is driven by an external motor or an internal combustion engine. The eccentric shaft drives the piston to reciprocate along the cylinder block through the connecting rod. The piston drives the diaphragm to expand and contract, and together with the one-way valves at the inlets and outlets of the cylinder block, the fluid can be continuously transported from the inlet to the outlet. Cooperating with the annular pipe bodies on both sides, a channel for transporting the fluid is formed. In the aforementioned patent application, the piston is directly connected to the diaphragm. When the piston moves up and down to drive the diaphragm to fluctuate, the diaphragm is prone to tearing or splitting at the periphery of the piston end face. Another example is an explosion-proof diaphragm pump disclosed in Chinese Utility Model Patent CN218266270U, which includes a mounting base and a connecting mechanism arranged above the mounting base. The connecting mechanism includes a disassembly component and a compression component; the disassembly component includes a threaded disc, a sheath, a threaded plate, a compression chamber, and a piston chamber. A compression chamber is arranged above the mounting base. A threaded plate is fixedly connected to the side wall of the compression chamber. Piston chambers are fixedly connected to both sides of the compression chamber. A threaded disc is fixedly connected to one end of the piston chamber, and a sheath is fixedly connected to the surface of the threaded disc; the compression component includes a cylinder, a crankshaft ring, a buffer mechanism, a piston chamber, a piston rod, a diaphragm, and a rubber bolt. A cylinder is fixedly connected to the top end of the compression chamber. A crankshaft ring is arranged on the surface of the cylinder. A buffer mechanism is arranged inside the compression chamber. A piston rod is slidably connected inside the piston chamber. One end of the piston rod is fixedly connected to a diaphragm, and a rubber bolt is fixedly connected to the outside of the diaphragm. The diaphragm in the aforementioned patent is also prone to tearing or splitting problems.

[0003] In view of this, the present utility model provides a double-layer diaphragm structure and a diaphragm pump having the same structure. By providing a double-layer diaphragm body, the occurrence of tearing and splitting problems is reduced, and by providing a support plate, the problems of tearing and splitting are further reduced, thereby prolonging the service life of the diaphragm and the diaphragm pump. Summary of the Utility Model

[0004] The present utility model aims to provide a double-layer diaphragm structure and a diaphragm pump having the same structure to solve the deficiencies existing in the prior art. The technical problems to be solved by the present utility model are achieved through the following technical solutions.

[0005] A double-layer diaphragm structure includes an integrally formed double-layer sheet body. The improvement lies in that: the double-layer sheet body includes a first double-layer sheet body and a second double-layer sheet body. The first double-layer sheet body includes a first horizontal part of the first sheet body, a transition part of the first sheet body, and a second horizontal part of the first sheet body that are connected in sequence. The second double-layer sheet body includes a second horizontal part of the second sheet body connected to the second horizontal part of the first sheet body. The height of the second horizontal part of the first sheet body in the vertical direction is lower than the height of the first horizontal part of the first sheet body, so that the first double-layer sheet body forms a shape sunken from the first horizontal part of the first sheet body to the second horizontal part of the first sheet body.

[0006] Preferably, a double-layer sheet edge protrusion is provided on the upper surface of the first horizontal part of the first sheet body near the outer edge.

[0007] Preferably, a double-layer sheet inclined surface part is provided on the lower surface of the first horizontal part of the first sheet body near the outer edge.

[0008] Preferably, the second double-layer sheet body further includes a first horizontal part of the second sheet body. The first horizontal part of the second sheet body is located outside the second horizontal part of the second sheet body. The two ends of the first horizontal part of the second sheet body exceed the two ends of the second horizontal part of the first sheet body and do not exceed the two ends of the transition part of the first sheet body.

[0009] Preferably, a double-layer sheet connection hole for connecting to a piston is provided at the corresponding positions in the middle of the second horizontal part of the first sheet body and the second horizontal part of the second sheet body. A double-layer sheet upper protrusion for sealing is provided on the upper surface of the middle part of the second horizontal part of the first sheet body. A double-layer sheet lower protrusion for sealing is provided on the lower surface of the middle part of the second horizontal part of the second sheet body. The double-layer sheet connection hole penetrates through the upper surface of the double-layer sheet upper protrusion and the lower surface of the double-layer sheet lower protrusion.

[0010] Preferably, it further includes a support plate. The support plate is provided at the lower part of the double-layer sheet body. The support plate includes a support plate body that abuts against the lower surface of the second horizontal part of the second sheet body. The peripheral part of the upper surface of the support plate body is a support plate transition part.

[0011] Preferably, a pallet connection hole for connecting with the piston is provided in the middle of the pallet body. Upper and lower accommodating portions are respectively provided in the middle of the upper and lower surfaces of the pallet body. The pallet connection hole penetrates through the lower and upper surfaces of the upper and lower accommodating portions of the pallet.

[0012] Preferably, it further includes a fixing plate which is abutted and arranged on the upper surface of the second horizontal portion of the first sheet body. The fixing plate includes a fixing plate body, and the peripheral portion of the lower surface of the fixing plate body is a fixing plate transition portion.

[0013] Preferably, a fixing plate connection hole for connecting with the piston is provided in the middle of the fixing plate body. Upper and lower accommodating portions are respectively provided in the middle of the upper and lower surfaces of the fixing plate body. The fixing plate connection hole penetrates through the lower and upper surfaces of the upper and lower accommodating portions of the fixing plate.

[0014] A diaphragm pump includes a diaphragm structure. The improvement lies in that: the diaphragm structure is a double-layer diaphragm structure as described in any one of the previous ones.

[0015] For the diaphragm pump of the present utility model, by providing a double-layer double-sheet body, namely a double-sheet first sheet body and a double-sheet second sheet body, the direct hard contact between the double-sheet first sheet body and the piston and the pallet is avoided through the double-sheet second sheet body, thereby reducing the problems of cracking and tearing of the double-sheet first sheet body; through the first sheet transition portion, a deformation path and a deformation stretching amount of the double-sheet first sheet body are provided, which not only reduces the occurrence of cracking and tearing of the double-sheet body, extends the service life of the diaphragm pump, but also increases the fluctuation stroke of the double-sheet body, thereby increasing the single-flow rate and volumetric efficiency; through the pallet, the problems of cracking and tearing of the double-sheet body can be reduced, and the stretching area can be increased, thereby not only extending the service life of the double-sheet body, but also increasing the single-flow rate and volumetric efficiency; through the fixing plate, the occurrence of tearing problems can be reduced, and the single-flow rate and volumetric efficiency can be increased.

[0016] In short, the diaphragm pump of the present utility model can effectively reduce the occurrence of diaphragm cracking and tearing, thereby extending the service life of the diaphragm and the diaphragm pump. At the same time, it can increase the single-flow rate and volumetric efficiency, thereby providing a larger liquid output and liquid output pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a full-sectional structural diagram of the present utility model;

[0019] Figure 3 is a schematic structural diagram when the present utility model is in use;

[0020] The reference numerals in the drawings are as follows: 1. double-layer sheet body; 11. first sheet body of the double-layer sheet; 111. first horizontal part of the first sheet body; 112. transition part of the first sheet body; 113. second horizontal part of the first sheet body; 12. second sheet body of the double-layer sheet; 121. first horizontal part of the second sheet body; 122. second horizontal part of the second sheet body; 13. connection hole of the double-layer sheet; 14. upper convex part of the double-layer sheet; 15. lower convex part of the double-layer sheet; 16. edge convex part of the double-layer sheet; 2. support plate; 21. support plate body; 22. transition part of the support plate; 23. connection hole of the support plate; 24. upper accommodating part of the support plate; 25. lower accommodating part of the support plate; 3. fixing plate; 31. fixing plate body; 32. transition part of the fixing plate; 33. connection hole of the fixing plate; 34. upper accommodating part of the fixing plate; 35. lower accommodating part of the fixing plate; a1. housing; a2. cylinder liner; a3. piston; a4. gland. Detailed implementation mode

[0021] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0022] Embodiment 1:

[0023] Referring to Figures 1 to 3 As shown, a double-layer membrane structure includes an integrally formed double-layer sheet body 1, and the improvement lies in that: the double-layer sheet body 1 includes a first sheet body 11 of the double-layer sheet and a second sheet body 12 of the double-layer sheet. The first sheet body 11 of the double-layer sheet includes a first horizontal part 111 of the first sheet body, a transition part 112 of the first sheet body, and a second horizontal part 113 of the first sheet body that are connected in sequence. The second sheet body 12 of the double-layer sheet includes a second horizontal part 122 of the second sheet body connected to the second horizontal part 113 of the first sheet body. The height of the second horizontal part 113 of the first sheet body in the vertical direction is lower than the height of the first horizontal part 111 of the first sheet body, so that the first sheet body 11 of the double-layer sheet forms a shape sunken from the first horizontal part 111 of the first sheet body to the second horizontal part 113 of the first sheet body.

[0024] In this embodiment, the first sheet body 11 of the double-layer sheet is used to fluctuate up and down to complete the operations of negative-pressure liquid suction and pressurized liquid infusion. The first horizontal portion 111 of the first sheet body is used to connect with the cylinder liner a2 and the gland a4 and seal the connection, so as to divide the entire chamber into an upper volume chamber and a lower piston chamber through the double-layer sheet body 1. The volume chamber is used to pump the liquid to be transported. That is, when the piston a3 moves downward, it stretches the double-layer sheet body 1 to realize the liquid suction operation, and when the piston a3 moves upward, it squeezes the double-layer sheet body 1 to realize the pressurized transportation of the liquid. The oil-liquid separation is also realized during the entire operation process. The transition portion 112 of the first sheet body is used to provide the telescopic deformation amount and deformation path for the fluctuation of the first sheet body 11. The fluctuation deformation of the first sheet body 11 of the double-layer sheet all occurs at the transition portion 112 of the first sheet body, thus avoiding the repeated hard contact and bending between the first horizontal portion 111 of the first sheet body and the cylinder liner a2, and further reducing the situation of cracking and tearing of the first sheet body 11 of the double-layer sheet at the first horizontal portion 111. When the piston a3 moves downward, the telescopic deformation amount and the defined deformation path provided by the transition portion 112 of the first sheet body make the transition portion 112 of the first sheet body not contact with the cylinder liner a2, that is, no friction will be generated, thus also avoiding the problem of cracking and tearing of the first sheet body 11 of the double-layer sheet at the transition portion 112 of the first sheet body. When the piston a3 moves upward, the transition portion 112 of the first sheet body is pressed, thus also limiting the deformation amount and deformation path of the compression of the first sheet body 11, thus avoiding the first sheet body 11 of the double-layer sheet being stretched upward by the piston a3, and further reducing the occurrence of cracking and tearing situations. The second horizontal portion 113 of the first sheet body is used to connect with the second sheet body 12 of the double-layer sheet and provide the deformation area for the fluctuation of the first sheet body 11 of the double-layer sheet. The second sheet body 12 of the double-layer sheet, on the one hand, can protect the first sheet body 11 of the double-layer sheet, avoiding the direct contact between the first sheet body 11 of the double-layer sheet and the piston a3, thus reducing the probability of the first sheet body 11 of the double-layer sheet being cracked and torn; on the other hand, it can increase the effective deformation area of the first sheet body 11 of the double-layer sheet, thus increasing the single flow rate and volumetric efficiency. Compared with the diaphragm in the prior art, the first sheet body 11 of the double-layer sheet in this embodiment is equivalent to the diaphragm in the prior art. By arranging the second sheet body 12 of the double-layer sheet at the lower part of the first sheet body 11 of the double-layer sheet and connecting with the piston a3 through the second sheet body 12 of the double-layer sheet, the repeated hard contact and bending between the first sheet body 11 of the double-layer sheet and the piston a3 when the first sheet body 11 of the double-layer sheet fluctuates up and down is avoided, thus avoiding the problem of cracking and tearing of the first sheet body 11 of the double-layer sheet at the second horizontal portion 113 of the first sheet body. Since the cross-sectional area of the second horizontal portion 122 of the second sheet body is much larger than the cross-sectional area of the piston a3, when the piston a3 moves downward, the area for driving the second horizontal portion 113 of the first sheet body to move downward through the second horizontal portion 122 of the second sheet body increases, thus increasing the effective deformation area of the volume chamber, and further increasing the single flow rate and volumetric efficiency.

[0025] In this embodiment, by providing the second sheet body 12 of the double sheet to replace the direct contact between the first sheet body 11 of the double sheet and the piston a3, the situation where the first sheet body 11 of the double sheet is torn or split at the second horizontal part 113 of the first sheet body is avoided. At the same time, by providing the first sheet body transition part 112 to define the deformation path of the first sheet body 11 of the double sheet and provide the deformation amount of the first sheet body 11 of the double sheet, the situation where the first sheet body 11 of the double sheet is torn or split at the first sheet body transition part 112 is avoided.

[0026] Further, the first sheet body transition part 112 is smoothly transitioned from the end of the first sheet body first horizontal part 111 to the end of the first sheet body second horizontal part 113, and both ends of the second sheet body second horizontal part 122 do not exceed both ends of the first sheet body second horizontal part 113.

[0027] Further, a double sheet edge convex part 16 is provided on the upper surface of the first sheet body first horizontal part 111 at a position close to the outer edge.

[0028] In this embodiment, by providing the double sheet edge convex part 16 and using the extrusion of the gland a4 to achieve extrusion sealing. Compared with the planar extrusion sealing in the prior art, the double sheet edge convex part 16 cooperates with the concave hole on the gland a4, so as to effectively extrude to achieve a better extrusion sealing effect. At the same time, due to the setting of the double sheet edge convex part 16 and the cooperation of the concave hole on the gland a4, the extrusion connection between the gland a4, the cylinder liner a2 and the first sheet body first horizontal part 111 is more stable, so that when the piston a3 moves downward to stretch the double sheet body 1, the first sheet body first horizontal part 111 can be prevented from being pulled off.

[0029] Further, a double sheet inclined surface part is provided on the lower surface of the first sheet body first horizontal part 111 at a position close to the outer edge.

[0030] The double sheet inclined surface part in this embodiment can seal the gap between the housing a1 and the cylinder liner a2. Refer to Figure 3 As shown, when the diaphragm pump is actually used, there is a clearance fit between the housing a1 and the cylinder liner a2, and there will be a small gap. The double sheet inclined surface part of the double sheet body 1 can just seal this gap.

[0031] Further, the second sheet body 12 of the double sheet further includes a second sheet body first horizontal part 121, the second sheet body first horizontal part 121 is located outside the second sheet body second horizontal part 122, and both ends of the second sheet body first horizontal part 121 exceed both ends of the first sheet body second horizontal part 113 and do not exceed both ends of the first sheet body transition part 112.

[0032] In this embodiment, the first horizontal portion 121 of the second sheet body is used to protect the first sheet body 11 of the double sheet, especially the second horizontal portion 113 and the transition portion 112 of the first sheet body. This is because when the piston a3 moves downward, the second horizontal portion 113 and the transition portion 112 of the first sheet body may come into direct hard contact with the cylinder liner a2 and the support plate 2. The setting of the first horizontal portion 121 of the second sheet body can play a protective role similar to that of the second horizontal portion 122 of the second sheet body in protecting the second horizontal portion 113 of the first sheet body, thereby avoiding the problems of cracking and tearing of the first sheet body 11 of the double sheet at the second horizontal portion 113 and / or the transition portion 112 of the first sheet body.

[0033] Furthermore, at the corresponding positions in the middle of the second horizontal portion 113 of the first sheet body and the second horizontal portion 122 of the second sheet body, there is a double-sheet connection hole 13 for connecting with the piston a3. On the upper surface of the middle of the second horizontal portion 113 of the first sheet body, there is a double-sheet upper convex portion 14 for sealing. On the lower surface of the middle of the second horizontal portion 122 of the second sheet body, there is a double-sheet lower convex portion 15 for sealing. The double-sheet connection hole 13 penetrates through the upper surface of the double-sheet upper convex portion 14 and the lower surface of the double-sheet lower convex portion 15.

[0034] In this embodiment, through a connecting member, such as a bolt, etc., it passes through the double-sheet connection hole 13 to connect the double-sheet body 1 and the piston a3; the double-sheet upper convex portion 14 and the double-sheet lower convex portion 15 can play the role of sealing the corresponding connection parts.

[0035] Embodiment 2:

[0036] Based on Embodiment 1, referring to Figure 2 as shown, the double-membrane structure further includes a support plate 2. The support plate 2 is arranged at the lower part of the double-sheet body 1. The support plate 2 includes a support plate body 21 that abuts against the lower surface of the second horizontal portion 122 of the second sheet body. The peripheral portion of the upper surface of the support plate body 21 is a support plate transition portion 22.

[0037] In this embodiment, the setting of the support plate 2 can reduce tearing and increase the volumetric efficiency. In the prior art, the cross-sectional area of the piston a3 is much smaller than that of the double-layer sheet body 1. After the piston a3 is directly connected to the double-layer sheet body 1, hard contact occurs between the two. As the piston a3 moves up and down, the connection between the double-layer sheet body 1 and the piston a3 is repeatedly bent by hard contact, which makes the double-layer sheet body 1 at this position easily torn. The cross-sectional area of the support plate 2 is much larger than that of the piston a3, and the peripheral part of the upper surface of the support plate body 21 is the support plate transition part 22, thus changing the linear contact into surface contact, thereby avoiding the problem of cracking and tearing of the double-layer sheet body 1 at the second horizontal part 122 of the second sheet body. Similarly, since the cross-sectional area of the piston a3 is much smaller than that of the double-layer sheet body 1, the stretching area of the double-layer sheet body 1 driven by the downward movement of the piston a3 is small. However, the cross-sectional area of the support plate 2 is much larger than that of the piston a3. When the piston a3 moves downward to drive the support plate 2 downward and the support plate 2 stretches the double-layer sheet body 1, the stretching area of the double-layer sheet body 1 is large, thereby increasing the volume of the volume chamber during a single deformation, and thus increasing the single flow rate and volumetric efficiency. In addition, in addition to reducing the occurrence of cracking and tearing phenomena, the support plate transition part 22 can also play a role in oil seepage. The piston chamber is filled with engine oil for lubrication. When the piston a3 moves downward, the engine oil will enter between the support plate 2 and the double-layer sheet body 1. When the piston a3 moves upward to push the support plate 2, the engine oil can smoothly flow back to the piston chamber along the support plate transition part 22, thereby avoiding the problem of bulging and deformation caused by the reverse pressure of the engine oil on the second horizontal part 122 of the second sheet body and the second horizontal part 113 of the first sheet body under the relative extrusion of the thrust of the piston a3 and the high-pressure liquid pressure.

[0038] In this embodiment, due to the addition of the support plate 2, the support plate 2 may abut against the second horizontal part 113 or the transition part 112 of the first sheet body when the piston a3 moves upward, resulting in repeated hard contact bending and causing cracking and tearing phenomena. On the one hand, the first horizontal part 121 of the second sheet body is used to separate the hard contact. On the other hand, the linear contact between the support plate 2 and the first horizontal part 121 of the second sheet body is changed into surface contact by the support plate transition part 22, thereby reducing the probability of the double-layer sheet body 1 having cracking and tearing problems.

[0039] Further, a support plate connection hole 23 for connecting with the piston a3 is provided in the middle of the support plate body 21. Support plate upper accommodating parts 24 and support plate lower accommodating parts 25 are respectively provided in the middle of the upper and lower surfaces of the support plate body 21. The support plate connection hole 23 penetrates the lower and upper surfaces of the support plate upper accommodating part 24 and the support plate lower accommodating part 25.

[0040] In this embodiment, a connecting member, such as a bolt, a stud bolt, etc., passes through the double-layer sheet connection hole 13 and the pallet connection hole 23 to connect the double-layer sheet body 1, the pallet 2 and the piston a3; the accommodating portion 24 on the pallet is used to accommodate the lower convex portion 15 of the double-layer sheet. Under the extrusion of the connecting member, the lower convex portion 15 of the double-layer sheet squeezes and seals the accommodating portion 24 on the pallet and the connecting member, thereby isolating the engine oil in the piston cavity from the liquid in the volume cavity and realizing oil-liquid separation.

[0041] Furthermore, the double-layer diaphragm structure further includes a fixing plate 3, the fixing plate 3 is abutted and arranged on the upper surface of the second horizontal portion 113 of the first sheet body, the fixing plate 3 includes a fixing plate body 31, and the peripheral portion of the lower surface of the fixing plate body 31 is a fixing plate transition portion 32.

[0042] In this embodiment, on the one hand, the fixing plate 3 realizes the fixed connection of the fixing plate 3, the double-layer sheet body 1, the pallet 2 and the piston a3; on the other hand, it increases the deformation area of the second horizontal portion 113 of the first sheet body of the double-layer sheet body 1, thereby increasing the volume of the volume cavity. This is because the cross-sectional area of a connecting member such as a nut is much smaller than the cross-sectional area of the second horizontal portion 113 of the first sheet body. When the piston a3 moves downward to pull the double-layer sheet body 1 to stretch, the second horizontal portion 113 of the first sheet body will make the bottom of the volume cavity form a funnel shape under the action of the connecting member. After using the fixing plate 3, the bottom of the volume cavity will form a cylindrical shape with the same diameter, thereby increasing the volume of the volume cavity, that is, increasing the single flow rate and increasing the volumetric efficiency.

[0043] In this embodiment, the setting of the fixing plate transition portion 32 can reduce the occurrence of tearing of the double-layer sheet body 1. The fixing plate transition portion 32 can change the contact between the edge of the lower surface of the fixing plate 3 and the upper surface of the second horizontal portion 113 of the double-layer sheet body 1 from linear contact to surface contact, thereby avoiding the tearing at the contact between the second horizontal portion 113 of the first sheet body and the edge of the lower surface of the fixing plate body 31 caused by the up and down fluctuation of the double-layer sheet body. That is, the fixing plate transition portion 32 plays a role in preventing tearing.

[0044] Furthermore, a fixing plate connection hole 33 for connecting with the piston a3 is provided in the middle of the fixing plate body 31. Fixing plate upper accommodating portions 34 and fixing plate lower accommodating portions 35 are respectively provided in the middle of the upper and lower surfaces of the fixing plate body 31. The fixing plate connection hole 33 penetrates through the lower and upper surfaces of the fixing plate upper accommodating portion 34 and the fixing plate lower accommodating portion 35.

[0045] In this embodiment, the fixing plate connection hole 33 can connect the fixing plate 3, the double-layer sheet body 1, the supporting plate 2, and the piston a3 through a connecting member. The accommodating portion 34 on the fixing plate can accommodate a sealing washer, and the lower accommodating portion 35 of the fixing plate can accommodate the convex portion 14 on the double-layer sheet. Under the extrusion of the connecting member, it plays a sealing role, thereby achieving the effect of separating the engine oil in the piston chamber from the liquid in the volume chamber.

[0046] Embodiment 3:

[0047] This embodiment provides a diaphragm pump, including a diaphragm structure. The improvement lies in that: the diaphragm structure is a double-layer diaphragm structure as described in any one of Embodiment 1 or 2.

[0048] When this embodiment is specifically used, the piston a3 is connected to the supporting plate 2, the double-layer sheet body 1, and the fixing plate 3 through a connecting member. The first horizontal portion 111 of the first sheet body of the double-layer sheet body 1 is squeezed and fixed and sealed by the cylinder sleeve a2 and the gland a4. Through the up and down movement of the piston a3, the stretching and restoration of the double-layer sheet body 1 are realized, thereby completing the operations of liquid suction, pressurization, and liquid discharge.

[0049] In the diaphragm pump of this embodiment, by providing a double-layer double-layer sheet body 1, that is, the double-layer sheet first sheet body 11 and the double-layer sheet second sheet body 12, the direct hard contact between the double-layer sheet first sheet body 11 and the piston a3 and the supporting plate 2 is avoided through the double-layer sheet second sheet body 12, thereby reducing the problems of cracking and tearing of the double-layer sheet first sheet body 11; through the first sheet body transition portion 112, the deformation path and deformation stretching amount of the double-layer sheet first sheet body 11 are provided, which not only reduces the occurrence of cracking and tearing of the double-layer sheet body 1, prolongs the service life of the diaphragm pump, but also increases the fluctuation stroke of the double-layer sheet body 1, thereby increasing the single flow rate and volumetric efficiency; through the supporting plate 2, the problems of cracking and tearing of the double-layer sheet body 1 can be reduced, and the stretching area can be increased, thereby not only prolonging the service life of the double-layer sheet body 1, but also increasing the single flow rate and volumetric efficiency; through the fixing plate 3, the occurrence of tearing problems can be reduced, and the single flow rate and volumetric efficiency can be increased.

[0050] It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0051] Note that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments described in accordance with the present application. As used herein, unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprises" and / or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and / or combinations thereof.

[0052] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0053] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0054] For ease of description, spatial relative terms such as "above", "on top of", "on the upper surface", "above", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "on top of" other devices or structures will then be positioned "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the corresponding explanations for the spatial relative descriptions used herein will be made.

[0055] In the detailed description above, reference has been made to the drawings, which form a part hereof. In the drawings, like symbols typically identify like components, unless the context indicates otherwise. The illustrated embodiments described in the detailed description, the drawings, and the claims are not meant to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0056] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A double-layer diaphragm structure, comprising an integrally formed double-layer body (1), characterized in that: The double-layer sheet body (1) comprises a first double-layer sheet body (11) and a second double-layer sheet body (12); the first double-layer sheet body (11) comprises a first sheet body first horizontal portion (111), a first sheet body transition portion (112) and a first sheet body second horizontal portion (113) connected in sequence; the second double-layer sheet body (12) comprises a second sheet body second horizontal portion (122) connected to the first sheet body second horizontal portion (113); the height of the first sheet body second horizontal portion (113) in the vertical direction is lower than the height of the first sheet body first horizontal portion (111) so that the first double-layer sheet body (11) forms a shape that is concave from the first sheet body first horizontal portion (111) to the first sheet body second horizontal portion (113).

2. A double-layer diaphragm structure according to claim 1, characterized in that: A double-layer sheet edge protrusion (16) is provided on the upper surface of the first horizontal portion (111) of the first sheet body at a position close to the outer edge.

3. A double-layer diaphragm structure according to claim 1, characterized in that: A double-layer sheet inclined portion is provided on the lower surface of the first horizontal portion (111) of the first sheet body at a position close to the outer edge.

4. A double-layer diaphragm structure according to claim 1, characterized in that: The second sheet body (12) of the double-layer sheet further comprises a first horizontal portion (121) of the second sheet body, wherein the first horizontal portion (121) of the second sheet body is located outside the second horizontal portion (122) of the second sheet body, and both ends of the first horizontal portion (121) of the second sheet body exceed both ends of the second horizontal portion (113) of the first sheet body and do not exceed both ends of the transition portion (112) of the first sheet body.

5. A double-layer diaphragm structure according to claim 1, characterized in that: A double-layer sheet connecting hole (13) for connecting to the piston (a3) ​​is provided at corresponding positions in the middle of the second horizontal portion (113) of the first sheet body and the second horizontal portion (122) of the second sheet body, a double-layer sheet upper protrusion (14) for sealing is provided on the middle upper surface of the second horizontal portion (113) of the first sheet body, and a double-layer sheet lower protrusion (15) for sealing is provided on the middle lower surface of the second horizontal portion (122) of the second sheet body, and the double-layer sheet connecting hole (13) passes through the upper surface of the double-layer sheet upper protrusion (14) and the lower surface of the double-layer sheet lower protrusion (15).

6. A double-layer diaphragm structure according to claim 1, characterized in that: It also includes a support plate (2), which is arranged at the lower part of the double-layer sheet body (1), and the support plate (2) includes a support plate body (21) abutting against the lower surface of the second horizontal part (122) of the second sheet body, and the peripheral part of the upper surface of the support plate body (21) is a support plate transition part (22).

7. A double-layer diaphragm structure according to claim 6, characterized in that: A pallet connecting hole (23) for connecting to the piston (a3) ​​is provided in the middle of the pallet body (21); a pallet upper accommodating portion (24) and a pallet lower accommodating portion (25) are provided in the middle of the upper and lower surfaces of the pallet body (21); and the pallet connecting hole (23) passes through the lower and upper surfaces of the pallet upper accommodating portion (24) and the pallet lower accommodating portion (25).

8. A double-layer diaphragm structure according to claim 1, characterized in that: It also includes a fixing plate (3), the fixing plate (3) being arranged in contact with the upper surface of the second horizontal portion (113) of the first sheet body, the fixing plate (3) including a fixing plate body (31), and the peripheral portion of the lower surface of the fixing plate body (31) being a fixing plate transition portion (32).

9. A double-layer diaphragm structure according to claim 8, characterized in that: A fixing plate connecting hole (33) for connecting with the piston (a3) ​​is provided in the middle of the fixing plate body (31), and a fixing plate upper accommodating portion (34) and a fixing plate lower accommodating portion (35) are provided in the middle of the upper and lower surfaces of the fixing plate body (31), respectively. The fixing plate connecting hole (33) passes through the lower and upper surfaces of the fixing plate upper accommodating portion (34) and the fixing plate lower accommodating portion (35).

10. A diaphragm pump, comprising a diaphragm structure, characterized in that: The diaphragm structure is a double-layer diaphragm structure as described in any one of claims 1-9.

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