Energy accumulator diaphragm and energy accumulator

Abstract

The utility model provides an energy accumulator diaphragm and an energy accumulator, which belong to the technical field of energy accumulators, the energy accumulator diaphragm comprises a diaphragm main body, the diaphragm main body is arranged in an energy accumulator shell and divides an inner cavity of the energy accumulator shell into an upper air cavity and a lower oil cavity, and the diaphragm main body comprises a first diaphragm and a second diaphragm which are arranged up and down; the first diaphragm is a rubber diaphragm made of high-airtightness rubber and used for making contact with gas in the upper gas cavity, and the second diaphragm is a rubber diaphragm made of oil-resistant rubber and used for making contact with hydraulic oil in the lower oil cavity. The diaphragm of the energy accumulator, provided by the utility model, has high air tightness and also can resist oil corrosion, so that the service life of the diaphragm main body is prolonged, and the service life of the energy accumulator is also prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of accumulators, and more specifically, relates to an accumulator diaphragm and an accumulator. Background Technique

[0002] The diaphragm accumulator is a common mechanical accumulator used to store fluid energy and release it when needed. The diaphragm accumulator consists of a housing, a diaphragm, and a working fluid. Among them, the diaphragm is installed inside the housing, and the diaphragm divides the chamber inside the housing into two pressure regions. The upper part is the gas region inside the accumulator, and the lower part is the region of the working fluid. In application, a sealed gas with a certain pressure is filled into the gas region at the upper part of the accumulator. When the working fluid enters the accumulator, the diaphragm will be pressed as the working fluid enters, thereby compressing the sealed gas in the gas region. When it is necessary to release the stored energy, the compressed sealed gas will push the diaphragm to push out the stored working fluid from the accumulator. As can be seen from the above, the diaphragm, as a key component in the accumulator, directly affects the service life of the accumulator.

[0003] Currently, the diaphragms used in existing diaphragm accumulators are basically rubber diaphragms, and the working fluids used are basically hydraulic oils. Regarding the selection of rubber diaphragms, generally, water-resistant rubbers are not oil-resistant, oil-resistant rubbers are not water-resistant, and rubbers with a compromise between oil resistance and water resistance have poor airtightness. After being used for a period of time, the sealed gas in the accumulator will leak out from the diaphragm, resulting in the failure of the accumulator. And high-airtightness rubbers are not oil-resistant. After being used for a long time, they are easily corroded and fail. Due to the above reasons, the accumulators on the market often have their actual service life difficult to reach the expected value due to diaphragm damage during application. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an accumulator diaphragm and an accumulator, aiming to solve the problem that the existing diaphragm accumulator has a short service life due to the easy damage of the diaphragm.

[0005] To achieve the above object, the technical solution adopted by the utility model is: to provide an accumulator diaphragm, including a diaphragm main body, the diaphragm main body is installed inside the accumulator housing, and divides the inner cavity of the accumulator housing into an upper gas cavity and a lower oil cavity. The diaphragm main body includes a first diaphragm and a second diaphragm stacked up and down. The first diaphragm is a rubber diaphragm made of high-airtightness rubber, and the first diaphragm is used to contact the gas in the upper gas cavity. The second diaphragm is a rubber diaphragm made of oil-resistant rubber, and the second diaphragm is used to contact the hydraulic oil in the lower oil cavity.

[0006] In a possible implementation, the diaphragm body is bowl-shaped, the first diaphragm is sleeved inside the second diaphragm, and the outer side wall of the first diaphragm is attached to the inner side wall of the second diaphragm.

[0007] In a possible implementation, the diaphragm body is provided with a mounting portion for assembling with the accumulator housing. The mounting portion includes a first sealing portion and a second sealing portion. The first sealing portion is disposed on the outer side wall of the second diaphragm for sealing cooperation with the accumulator housing, and the second sealing portion is disposed on the inner side wall of the first diaphragm for sealing cooperation with the accumulator housing.

[0008] In a possible implementation, an anti-disengagement structure is provided between the first diaphragm and the second diaphragm. The anti-disengagement structure includes a rib disposed circumferentially on the inner side wall of the bowl-shaped end of the second diaphragm, and a groove disposed circumferentially on the outer side wall of the bowl-shaped end of the first diaphragm corresponding to the rib. The rib and the groove are inserted and fitted together to limit the longitudinal relative movement between the first diaphragm and the second diaphragm.

[0009] In a possible implementation, the middle of the outer side wall of the bottom of the first diaphragm is recessed upward to form a pit portion at the bottom of the first diaphragm, and the middle of the inner side wall of the bottom of the second diaphragm protrudes upward to form a boss portion at the bottom of the second diaphragm. The boss portion and the pit portion are inserted and fitted together to limit the relative position between the first diaphragm and the second diaphragm.

[0010] In a possible implementation, a reinforcing plate is embedded in the boss portion, and the reinforcing plate is used to enhance the strength of the bottom of the second diaphragm.

[0011] In a possible implementation, a sealing gap is provided between the bowl-shaped ends of the first diaphragm and the second diaphragm, and the sealing gap is filled with a sealant.

[0012] In a possible implementation, the thickness ratio of the first diaphragm to the second diaphragm is not less than 2:1.

[0013] The beneficial effects of an accumulator diaphragm provided by the present utility model are as follows: Compared with the prior art, for the accumulator diaphragm of the present utility model, the diaphragm body is composed of a first diaphragm and a second diaphragm stacked up and down. Among them, the first diaphragm is used to contact the gas in the upper gas chamber and is made of rubber with high airtightness, which can effectively prevent the gas in the upper gas chamber from leaking through the first diaphragm by osmosis. The second diaphragm is arranged below the first diaphragm and is used to contact the hydraulic oil in the lower oil chamber. The second diaphragm isolates the first diaphragm from the hydraulic oil and is made of oil-resistant rubber to prevent the hydraulic oil from causing corrosive damage to the first diaphragm. In this way, the combination of the first diaphragm and the second diaphragm to form the diaphragm body can have high airtightness while also being resistant to oil corrosion, thereby extending the service life of the diaphragm body and further improving the service life of the accumulator.

[0014] The present utility model also provides an accumulator, including the above-mentioned accumulator diaphragm.

[0015] Compared with the prior art, an accumulator provided by the present utility model uses the above-mentioned accumulator diaphragm and has all the beneficial effects of the above-mentioned accumulator diaphragm. By using the first diaphragm and the second diaphragm stacked up and down to form the diaphragm body, the first diaphragm is made of rubber with high airtightness, and the second diaphragm is made of oil-resistant rubber. In this way, the combination of the first diaphragm and the second diaphragm to form the diaphragm body can have high airtightness while also being resistant to oil corrosion, thereby extending the service life of the diaphragm body and further improving the service life of the accumulator. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic cross-sectional structure diagram of an accumulator diaphragm provided by an embodiment of the present utility model;

[0018] Figure 2 For Figure 1 the enlarged structure diagram at M in

[0019] Figure 3 It is a schematic cross-sectional structure diagram of an accumulator provided by an embodiment of the present utility model.

[0020] Description of the Reference Numerals:

[0021] 1. Diaphragm body; 11. First diaphragm; 111. Second sealing part; 112. Groove; 113. Pit part; 12. Second diaphragm; 121. First sealing part; 122. Convex rib; 123. Convex platform part; 13. Sealing gap; 14. Reinforcing plate; 2. Accumulator housing; 21. Upper air chamber; 22. Lower oil chamber; 201. Installation groove; 3. Support ring; 4. Sealing plug; 5. Infusion joint. Detailed implementation manners

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0026] Please refer to Figures 1 to 2, a description of an accumulator diaphragm provided by the present utility model will be given. The accumulator diaphragm includes a diaphragm body 1, which is installed inside an accumulator housing 2 and divides the inner cavity of the accumulator housing 2 into an upper gas chamber 21 and a lower oil chamber 22. The diaphragm body 1 includes a first diaphragm 11 and a second diaphragm 12 stacked up and down. The first diaphragm 11 is a rubber diaphragm made of high-airtight rubber and is used to contact the gas in the upper gas chamber 21. The second diaphragm 12 is a rubber diaphragm made of oil-resistant rubber and is used to contact the hydraulic oil in the lower oil chamber 22.

[0027] Compared with the prior art, the accumulator diaphragm provided by the present utility model has a diaphragm body 1 composed of a first diaphragm 11 and a second diaphragm 12 stacked up and down. Among them, the first diaphragm 11 is used to contact the gas in the upper gas chamber 21 and is made of high-airtight rubber, which can effectively prevent the gas in the upper gas chamber 21 from leaking through the first diaphragm 11. The second diaphragm 12 is arranged below the first diaphragm 11 and is used to contact the hydraulic oil in the lower oil chamber 22. The second diaphragm 12 isolates the first diaphragm 11 from the hydraulic oil and is made of oil-resistant rubber to prevent the hydraulic oil from corroding the first diaphragm 11. In this way, the combination of the first diaphragm 11 and the second diaphragm 12 to form the diaphragm body 1 can be both highly airtight and resistant to oil corrosion, thus extending the service life of the diaphragm body 1 and further improving the service life of the accumulator.

[0028] In some embodiments, please refer to Figures 1 to 2 , the diaphragm body 1 is generally bowl-shaped, and the shapes of the first diaphragm 11 and the second diaphragm 12 are similar. In application, the first diaphragm 11 is sleeved inside the second diaphragm 12, and the outer side wall of the first diaphragm 11 is attached to the inner side wall of the second diaphragm 12. An installation part for assembling with the accumulator housing 2 is provided on the diaphragm body 1. Among them, the installation part includes a first sealing part 121 and a second sealing part 111. The first sealing part 121 is arranged on the outer side wall of the second diaphragm 12 and is used for sealing cooperation with the accumulator housing 2. The second sealing part 111 is arranged on the inner side wall of the first diaphragm 11 and is used for sealing cooperation with the accumulator housing 2. In this embodiment, the first sealing part 121 is an annular boss arranged circumferentially on the outer side wall at the bowl mouth of the second diaphragm 12, and the second sealing part 111 is an annular groove body with an inward opening arranged circumferentially on the inner side wall at the bowl mouth of the first diaphragm 11. When in use, the first sealing part 121 and the second sealing part 111 are simultaneously clamped in an installation groove 201 arranged at the corresponding position of the accumulator housing 2.

[0029] In some embodiments, please refer to Figures 1 to 2, a anti - detachment structure is provided between the first diaphragm 11 and the second diaphragm 12. In this embodiment, the anti - detachment structure includes a rib 122 circumferentially arranged on the inner side wall of the bowl - mouth end of the second diaphragm 12, and a groove 112 circumferentially arranged on the outer side wall of the bowl - mouth end of the first diaphragm 11 corresponding to the rib 122. The rib 122 and the groove 112 are inserted and matched to limit the longitudinal relative movement between the first diaphragm 11 and the second diaphragm 12.

[0030] Further, please refer to Figure 1 , the middle part of the outer side wall at the bottom of the first diaphragm 11 is recessed upward, forming a pit part 113 at the bottom of the first diaphragm 11. The middle part of the inner side wall at the bottom of the second diaphragm 12 protrudes upward, forming a boss part 123 at the bottom of the second diaphragm 12. The boss part 123 and the pit part 113 are inserted and matched to limit the relative position between the first diaphragm 11 and the second diaphragm 12.

[0031] In the actual application of the accumulator, due to the hydraulic oil repeatedly entering and leaving the lower oil cavity 22, the bottom of the second diaphragm 12 will repeatedly impact the accumulator housing 2 under the action of the compressed gas in the upper air cavity 21. After a long time, it is easy to cause damage to the bottom of the second diaphragm 12. Therefore, in some embodiments, a reinforcing plate 14 is embedded in the boss part 123 of the second diaphragm 12. The reinforcing plate 14 is used to enhance the strength of the bottom of the second diaphragm 12. Generally, the reinforcing plate 14 is a metal plate. To reduce the weight, it is preferably a metal aluminum plate. In the production, the reinforcing plate 14 is embedded on the outer side wall at the bottom of the second diaphragm 12, so that when the second diaphragm 12 is working, the reinforcing plate 14 is in direct contact with the accumulator housing 2 to protect the second diaphragm 12.

[0032] In some embodiments, please refer to Figures 1 to 2 , a sealing gap 13 is provided between the bowl - mouth ends of the first diaphragm 11 and the second diaphragm 12. In this embodiment, a reduced - diameter section is provided at the edge of the outer side wall of the bowl - mouth end of the first diaphragm 11, and the height of the reduced - diameter section is between 2 - 3 mm. After the first diaphragm 11 is sleeved inside the second diaphragm 12, an upward - opening annular groove is formed between the reduced - diameter section of the first diaphragm 11 and the inner side wall of the bowl - mouth end of the second diaphragm 12. The annular groove is the sealing gap 13. In the production, sealant is filled in the sealing gap 13, and the bowl - mouth ends of the first diaphragm 11 and the second diaphragm 12 are bonded together through the sealant to make the first diaphragm 11 and the second diaphragm 12 airtight.

[0033] In some embodiments, in order to ensure good airtightness of the first diaphragm 11, the thickness of the first diaphragm 11 is greater than that of the second diaphragm 12. In this embodiment, the thickness ratio of the first diaphragm 11 to the second diaphragm 12 is set to be not less than 2:1.

[0034] The present utility model also provides an accumulator which uses the above-mentioned accumulator diaphragm. Now, an accumulator provided by the present utility model will be described. Please refer to Figure 3 , the accumulator includes an accumulator housing 2. The interior of the accumulator housing 2 has a storage cavity. A support ring 3 is provided in the middle of the storage cavity. An installation groove 201 is provided between the support ring 3 and the accumulator housing 2. A diaphragm body 1 is installed in the installation groove 201. The diaphragm body 1 divides the storage cavity into an upper air cavity 21 and a lower oil cavity 22. An inflation hole communicating with the upper air cavity 21 is provided in the upper part of the accumulator housing 2. A sealing plug 4 is provided in the inflation hole. An infusion joint 5 is provided in the lower part of the accumulator housing 2. The infusion joint 5 communicates with the lower oil cavity 22 and is used to input hydraulic oil into the lower oil cavity 22.

[0035] Compared with the prior art, the accumulator provided by the present utility model uses the above-mentioned accumulator diaphragm and has all the beneficial effects of the above-mentioned accumulator diaphragm. By using the first diaphragm 11 and the second diaphragm 12 stacked up and down to form the diaphragm body 1, the first diaphragm 11 is made of high-airtight rubber, and the second diaphragm 12 is made of oil-resistant rubber. In this way, the combination of the first diaphragm 11 and the second diaphragm 12 to form the diaphragm body 1 can be both highly airtight and resistant to oil corrosion, thereby extending the service life of the diaphragm body 1 and further improving the service life of the accumulator.

[0036] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An accumulator diaphragm, comprising a diaphragm body (1), wherein the diaphragm body (1) is installed inside an accumulator housing (2) to separate the inner cavity of the accumulator housing (2) into an upper air cavity (21) and a lower oil cavity (22), wherein: The diaphragm body (1) comprises a first diaphragm (11) and a second diaphragm (12) which are stacked up and down, wherein the first diaphragm (11) is a rubber diaphragm made of high airtightness rubber, and the first diaphragm (11) is used to contact the gas in the upper air chamber (21), and the second diaphragm (12) is a rubber diaphragm made of oil-resistant rubber, and the second diaphragm (12) is used to contact the hydraulic oil in the lower oil chamber (22).

2. An accumulator diaphragm according to claim 1, characterized in that: The diaphragm body (1) is bowl-shaped, the first diaphragm (11) is sleeved inside the second diaphragm (12), and the outer wall of the first diaphragm (11) fits with the inner wall of the second diaphragm (12).

3. An accumulator diaphragm according to claim 2, characterized in that: The diaphragm body (1) is provided with a mounting portion for assembling with the accumulator housing (2), and the mounting portion includes a first sealing portion (121) and a second sealing portion (111), wherein the first sealing portion (121) is arranged on the outer side wall of the second diaphragm (12) and is used for sealing cooperation with the accumulator housing (2), and the second sealing portion (111) is arranged on the inner side wall of the first diaphragm (11) and is used for sealing cooperation with the accumulator housing (2).

4. An accumulator diaphragm according to claim 2, characterized in that: An anti-slip structure is provided between the first diaphragm (11) and the second diaphragm (12), and the anti-slip structure includes a convex ridge (122) arranged on the circumference of the inner wall of the bowl-mouth end of the second diaphragm (12), and a groove (112) arranged on the circumference of the outer wall of the bowl-mouth end of the first diaphragm (11) and corresponding to the convex ridge (122). The convex ridge (122) and the groove (112) are plug-fitted into each other to limit the longitudinal relative movement of the first diaphragm (11) and the second diaphragm (12).

5. An accumulator diaphragm according to claim 2, characterized in that: The middle portion of the outer side wall at the bottom of the first diaphragm (11) is recessed upward, forming a recessed portion (113) at the bottom of the first diaphragm (11); the middle portion of the inner side wall at the bottom of the second diaphragm (12) is protruding upward, forming a boss portion (123) at the bottom of the second diaphragm (12); the boss portion (123) is inserted into and matched with the recessed portion (113) to limit the relative position of the first diaphragm (11) and the second diaphragm (12).

6. An accumulator diaphragm according to claim 5, characterized in that: A reinforcement plate (14) is embedded in the boss portion (123), and the reinforcement plate (14) is used to enhance the strength of the bottom of the second diaphragm (12).

7. An accumulator diaphragm according to claim 2, characterized in that: A sealing gap (13) is provided between the bowl-mouth ends of the first diaphragm (11) and the second diaphragm (12), and the sealing gap (13) is filled with sealant.

8. An accumulator diaphragm according to claim 2, characterized in that: The thickness ratio of the first diaphragm (11) to the second diaphragm (12) is not less than 2:

1.

9. An accumulator, characterized in that: An accumulator diaphragm as claimed in any one of claims 1 to 8 is used.

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