Piston type hydraulic energy accumulator

Abstract

The utility model is suitable for the technical field of hydraulic equipment, and provides a piston type hydraulic energy accumulator which is characterized in that the two ends of a barrel are connected with a first end cover and a second end cover respectively; the piston is provided with a guide groove and multiple sets of mounting grooves, the guide groove is used for guiding hydraulic oil to flow to the oil pipe, and the mounting grooves are used for mounting sealing pieces. The pressure of the oil cavity is kept in the cylinder through air pressure, so that the energy storage effect is achieved, the guide groove is formed in the piston and makes contact with the oil cavity, and when hydraulic oil guiding the oil cavity flows out of one end of the oil pipe, the situation that hydraulic oil is reserved in a connecting gap between the cylinder and the piston and influences use of the energy accumulator is avoided; the multiple sets of sealing pieces with different performance effects are installed on the piston so that the sealing pieces can prevent leakage of hydraulic oil and gas conveniently, friction between the piston and the barrel can be reduced, the energy storage effect of the piston type hydraulic energy accumulator can be better, and the problems that in the spring replacing process, steps are tedious, and the using effect of the energy accumulator is poor are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic equipment, and in particular relates to a piston type hydraulic accumulator. Background Art

[0002] The accumulator is an energy storage device in the hydraulic and pneumatic system. It converts the energy in the system into compression energy or potential energy and stores it at the right time. When the system needs it, it converts the compression energy or potential energy into hydraulic or air pressure energy and releases it to replenish the system.

[0003] At present, common accumulators have three structures: air-filled, heavy hammer, and spring. The functions of these accumulators are mostly to play the role of buffering, replenishing pressure, and pulse in the system. Moreover, the pressure replenishment time is short during work and is limited by the field of use.

[0004] In the prior art, in most cases, an accumulator with an inflatable structure is often used, and a piston is arranged in the accumulator to play a role in buffering, reducing friction, etc. However, when the piston is installed inside the accumulator, a one-way sealing ring and a supporting ring are often used to be installed on the piston. Only the one-way sealing ring can seal and isolate the oil and gas in the accumulator, and the sealing effect is poor. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide a piston type hydraulic accumulator, aiming to solve the problem in the prior art that in most cases, an accumulator with an inflatable structure is often used, and a piston is arranged in the accumulator to play a role of buffering, reducing friction, etc., but when the piston is installed inside the accumulator, a one-way sealing ring and a supporting ring are often used to be installed on the piston, and only the one-way sealing ring is used to seal and isolate the oil and gas in the accumulator, and the sealing effect is poor.

[0006] The utility model is implemented in this way: a piston hydraulic accumulator, the piston hydraulic accumulator comprising:

[0007] A cylinder body, wherein the cylinder body is provided with a first end cover, and the first end cover is connected to the oil pipe;

[0008] The piston is installed inside the cylinder so that an oil chamber and an air chamber are formed inside the cylinder, and the piston is provided with a plurality of groups of mounting grooves; the mounting grooves include a first type of mounting groove, a second type of mounting groove, a third type of mounting groove and a fourth type of mounting groove, the first type of mounting groove is used to install a buffer seal that reduces friction between the piston and the cylinder, the second type of mounting groove is provided in two groups, the second type of mounting groove is used to install a one-way seal that prevents leakage of hydraulic oil or gas, the third type of mounting groove is used to install a drainage seal that diverts hydraulic oil to the oil chamber, and the fourth type of mounting groove is used to install a bidirectional seal, and the bidirectional seal is used to install to prevent leakage of hydraulic oil and gas.

[0009] Preferably, the piston is arranged as a columnar structure, and the two end faces of the piston are respectively a first end face and a second end face, an annular protrusion is arranged on the first end face and the outer diameter is the same as the outer diameter of the first end face, a first positioning groove is formed between the first end face and the annular protrusion, the first positioning groove is connected to the oil chamber, and a second positioning groove is arranged at the center position of the second end face, and the second positioning groove is connected to the air chamber.

[0010] Preferably, the piston is also provided with guide grooves, and the guide grooves are provided in multiple groups. The guide grooves are used to prevent the formation of an oil film between the piston and the first end cover. The guide grooves are provided on the annular protrusions of the first end face, and the guide groove surfaces are higher than the first positioning groove surfaces.

[0011] Preferably, the mounting groove is arranged in an annular structure, and the mounting groove is arranged in six groups. The six groups of mounting grooves are arranged side by side on the side wall surface of the piston and are respectively the first mounting groove, the second mounting groove, the third mounting groove, the fourth mounting groove, the fifth mounting groove and the sixth mounting groove. The first mounting groove and the sixth mounting groove are type I mounting grooves and have the same groove depth and groove width. The second mounting groove is type III mounting groove and has a groove depth greater than the groove depth of the first mounting groove, the third mounting groove, the fourth mounting groove, the fifth mounting groove and the sixth mounting groove. The third mounting groove and the fifth mounting groove are type II mounting grooves and have the same groove depth and groove width. The fourth mounting groove is type IV mounting groove and has a groove width greater than the groove width of the first mounting groove, the second mounting groove, the third mounting groove, the fifth mounting groove and the sixth mounting groove.

[0012] Preferably, the seal includes a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a sixth sealing ring. The first sealing ring and the sixth sealing ring are respectively installed on the first mounting groove and the sixth mounting groove. The first sealing ring and the sixth sealing ring are used to reduce the friction between the piston and the cylinder. The second sealing ring is used to guide the infiltrated hydraulic oil to flow into the oil chamber. The third sealing ring is used to block the infiltration of hydraulic oil on the oil chamber. The fifth sealing ring is used to block the infiltration of gas on the air chamber. The fourth sealing ring is provided with a double-layer sealing layer for blocking the hydraulic oil in the oil chamber and the gas in the air chamber.

[0013] Preferably, the cylinder body is configured to be a cylindrical cylinder, and the first end cover and the second end cover are respectively connected to the two ends of the cylinder body, the first end cover is used to connect to the oil pipe, and the inner wall surface of the cylinder body is provided with a first annular protrusion and a second annular protrusion, and a first annular mounting groove is provided on one side of the first annular protrusion, and the first annular protrusion and the first annular mounting groove are used to position the first end cover, and a second annular mounting groove is provided on one side of the second annular protrusion, and the second annular protrusion and the second annular mounting groove are used to position the second end cover.

[0014] Preferably, the first end cover is provided with a mounting portion and a connecting portion, and a seventh mounting groove and a third annular protrusion are provided on the outer side surface of the first end cover mounting portion, the seventh mounting groove is used to install a seventh sealing ring and cooperates with the first annular protrusion of the cylinder body so that the first end cover is connected to the cylinder body, and the third annular protrusion is embedded in the first annular mounting groove; an oil hole is provided at the center position of the first end cover connecting portion, and an oil pipe is sleeved on the oil hole, and the oil pipe is connected to the hydraulic system through a pin so that hydraulic oil can be input or output in the oil chamber of the piston hydraulic accumulator through the oil pipe.

[0015] Preferably, two sets of positioning plates are provided on the first end cover and are installed on the connecting portion of the first end cover, and the positioning plates are used to position the piston hydraulic accumulator.

[0016] Preferably, an eighth mounting groove and a fourth annular protrusion are provided on the outer side surface of the second end cover mounting portion, the eighth mounting groove is used to install the eighth sealing ring and cooperates with the second annular protrusion of the cylinder body to connect the second end cover to the cylinder body, the fourth annular protrusion is embedded in the second annular mounting groove, an air hole is provided at the center position of the second end cover, an air valve is installed on the air hole, a protective cap is provided on the air valve, and the protective cap is used to prevent impurities from entering the air cavity.

[0017] The utility model provides a piston type hydraulic accumulator, the utility model provides a piston installed in the internal structure of a cylinder body and an oil chamber and an air chamber are formed on both sides of the piston respectively, a first end cover is provided on the cylinder body for connecting with the oil pipe, and a second end cover is provided for connecting with the air valve, the oil chamber pressure is maintained inside the cylinder body through air pressure to play an energy storage role, a guide groove is provided on the piston and the guide groove is in contact with the oil chamber and is convenient for guiding the hydraulic oil in the oil chamber to flow out from one end of the oil pipe to prevent the hydraulic oil from being left in the connection gap between the cylinder body and the piston to affect the use of the accumulator, multiple groups of mounting grooves are provided on the piston and multiple groups of seals with different performance functions are installed on the mounting grooves so that the seals can prevent the leakage of hydraulic oil and gas and reduce the friction between the piston and the cylinder body, so that the energy storage effect of the piston type hydraulic accumulator is better, and the problem that when the piston is installed inside the accumulator, a one-way sealing ring and a supporting ring are often used to be installed on the piston, and only the one-way sealing ring is used to seal and isolate the oil and gas in the accumulator, resulting in poor sealing effect is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural diagram of a piston type hydraulic accumulator provided in an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the internal structure of a piston type hydraulic accumulator provided in an embodiment of the utility model;

[0020] Figure 3A schematic diagram of the structure of a piston in a piston-type hydraulic accumulator provided in an embodiment of the utility model;

[0021] Figure 4 A sectional view of a front view of a piston type hydraulic accumulator provided in an embodiment of the utility model;

[0022] Figure 5 A schematic diagram of the bottom structure of a piston type hydraulic accumulator provided in an embodiment of the utility model.

[0023] In the accompanying drawings: 1. Cylinder; 11. First end cover; 111. Seventh mounting groove; 12. Positioning plate; 13. Second end cover; 131. Eighth mounting groove; 2. Piston; 21. Guide groove; 22. Mounting groove; 221. First mounting groove; 222. Second mounting groove; 223. Third mounting groove; 224. Fourth mounting groove; 225. Fifth mounting groove; 226. Sixth mounting groove; 3. Oil pipe; 4. Air valve; 41. Protective cap. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0026] like Figure 1-5 As shown, it is a structural diagram of a piston 2-type hydraulic accumulator provided by an embodiment of the utility model, comprising: a cylinder 1, the cylinder 1 is provided with a first end cover 11, and the first end cover 11 is connected to the oil pipe 3;

[0027] The piston 2 is installed inside the cylinder 1 so that an oil chamber and an air chamber are formed inside the cylinder 1. The piston 2 is provided with a plurality of groups of mounting grooves 22; the mounting grooves 22 include a first type of mounting grooves 22, a second type of mounting grooves 22, a third type of mounting grooves 22 and a fourth type of mounting grooves 22. The first type of mounting grooves 22 are used to install a buffer seal that reduces the friction between the piston 2 and the cylinder 1. The second type of mounting grooves 22 are provided in two groups. The second type of mounting grooves 22 are used to install a one-way seal that prevents leakage of hydraulic oil or gas. The third type of mounting grooves 22 are used to install a drainage seal that diverts hydraulic oil to the oil chamber. The fourth type of mounting grooves 22 are used to install a bidirectional seal. The bidirectional seal is used to prevent leakage of hydraulic oil and gas.

[0028] In the embodiment of the utility model, preferably, the piston 2 type hydraulic accumulator is mainly composed of a cylinder 1 and a piston 2. The cylinder 1 can be a columnar structure with a certain length, and can be cylindrical but not limited to this shape. A first end cover 11 and a second end cover 13 are respectively arranged at both ends of the cylinder 1. The first end cover 11 is connected to the oil pipe 3 in the hydraulic system to facilitate the input of hydraulic oil into the oil chamber or the output of the oil in the oil chamber from the oil pipe 3. The second end cover 13 is connected to the air valve 4 in the air pressure system to facilitate the entry of gas into the air chamber so that the energy stored in the oil chamber maintains the pressure. When it needs to be released, the gas can also be output from the air chamber to the outside of the air valve 4, and the piston 2 is arranged between the oil chamber and the air chamber. The shape of the piston 2 is as follows: A cross-section similar to that of the cylinder 1 can be set, and the same cylindrical structure can be set. A guide groove 21 can be set on the end face of the piston 2 that contacts the oil chamber to guide the hydraulic oil in the oil chamber to flow out of the gap between the end face of the piston 2 and the contact surface of the end cover to prevent the hydraulic oil from accumulating between the piston 2 and the end cover and affecting the use effect of the accumulator. A plurality of installation grooves 22 are set on the piston 2, and the plurality of installation grooves 22 are respectively used to install a plurality of sets of seals with different functions. The seals can be used to prevent the hydraulic oil on the oil chamber from leaking into the air chamber, the gas on the air chamber from leaking into the oil chamber, and even affecting the energy storage effect inside the entire accumulator, and the seals can also reduce the friction between the piston 2 and the cylinder 1.

[0029] In one example of the utility model, the utility model is provided with a piston 2 installed in the internal structure of the cylinder 1 so that the two sides of the piston 2 form an oil chamber and an air chamber respectively, a first end cover 11 is provided on the cylinder 1 for connecting with the oil pipe 3, and a second end cover 13 is provided for connecting with the air valve 4, and the oil chamber pressure is maintained inside the cylinder 1 by air pressure to play an energy storage role, and a guide groove 21 is provided on the piston 2 and the guide groove 21 contacts with the oil chamber and prevents the connection between the cylinder 1 and the piston 2 when the hydraulic oil in the oil chamber flows out from one end of the oil pipe 3 to facilitate the guide. Hydraulic oil is left in the joint gap, which affects the use of the accumulator. Multiple groups of mounting grooves 22 are provided on the piston 2, and multiple groups of seals with different performances are installed on the mounting grooves 22 so that the seals can prevent the leakage of hydraulic oil and gas and reduce the friction between the piston 2 and the cylinder 1, so that the energy storage effect of the piston 2 type hydraulic accumulator is better. This solves the problem that when the piston 2 is installed inside the accumulator, a one-way sealing ring and a supporting ring are often used to be installed on the piston 2, and only the one-way sealing ring is used to seal and isolate the oil and gas in the accumulator, resulting in a poor sealing effect.

[0030] like Figure 1-5As shown, as a preferred embodiment of the utility model, the piston 2 is configured as a columnar structure, and the two end faces of the piston 2 are respectively a first end face and a second end face, an annular protrusion is provided on the first end face and the outer diameter is the same as the outer diameter of the first end face, a first positioning groove is formed between the first end face and the annular protrusion, the first positioning groove is connected to the oil chamber, and a second positioning groove is provided at the center position of the second end face, and the second positioning groove is connected to the air chamber.

[0031] In an embodiment of the utility model, preferably, the annular protrusion arranged on the first end face of the piston 2 forms a first positioning groove with a certain height difference on the first end face, and an oil chamber is formed between the first positioning groove and the first end cover 11 on the cylinder 1, and a second positioning groove with a certain depth is arranged on the second end face, and an air chamber is formed between the second positioning groove and the second positioning groove on the cylinder 1, and the provision of the second positioning groove can reduce the overall volume of the piston 2 so as to better maintain the pressure inside the cylinder 1 for a better energy storage effect.

[0032] like Figure 1-5 As shown, as a preferred embodiment of the utility model, the piston 2 is further provided with a guide groove 21, and the guide groove 21 is provided in multiple groups. The guide groove 21 is used to prevent the formation of an oil film between the piston 2 and the first end cover 11. The guide groove 21 is provided on the annular protrusion of the first end face, and the groove surface of the guide groove 21 is higher than the groove surface of the first positioning groove.

[0033] In an embodiment of the utility model, preferably, the guide groove 21 can be arranged as an irregular groove with a certain depth on the annular protrusion, and the length direction of the guide groove 21 is perpendicular to the central axis of the piston 2, and the two opposite side edges of the guide groove 21 intersect with the annular edge of the annular protrusion and the other two opposite side edges coincide with the annular edge.

[0034] like Figure 1-5 As shown, as a preferred embodiment of the utility model, the mounting groove 22 is set to an annular structure, and the mounting groove 22 is set to six groups. The six groups of mounting grooves 22 are arranged side by side on the side wall of the piston 2 and are respectively a first mounting groove 221, a second mounting groove 222, a third mounting groove 223, a fourth mounting groove 224, a fifth mounting groove 225 and a sixth mounting groove 226. The first mounting groove 221 and the sixth mounting groove 226 are the same type of mounting grooves 22 and have the same groove depth and groove width. The second mounting groove 22 2 is a third type of mounting groove 22 and its groove depth is greater than the groove depths of the first mounting groove 221, the third mounting groove 223, the fourth mounting groove 224, the fifth mounting groove 225 and the sixth mounting groove 226, the third mounting groove 223 and the fifth mounting groove 225 are second type of mounting grooves 22 and their groove depths and groove widths are the same, the fourth mounting groove 224 is fourth type of mounting groove 22 and its groove width is greater than the groove widths of the first mounting groove 221, the second mounting groove 222, the third mounting groove 223, the fifth mounting groove 225 and the sixth mounting groove 226.

[0035] In an embodiment of the utility model, preferably, multiple groups of mounting grooves 22 can be set as annular grooves of different widths and depths and arranged in parallel on the outer wall surface of the piston 2, and the first mounting groove 221, the second mounting groove 222, the third mounting groove 223, the fourth mounting groove 224, the fifth mounting groove 225 and the sixth mounting groove 226 can be arranged in sequence and the first mounting groove 221 can be a groove position close to one end of the oil chamber, and the sixth mounting groove 226 can be a groove position close to one end of the air chamber.

[0036] like Figure 1-5 As shown, as a preferred embodiment of the utility model, the sealing member includes a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a sixth sealing ring. The first sealing ring and the sixth sealing ring are respectively installed on the first mounting groove 221 and the sixth mounting groove 226. The first sealing ring and the sixth sealing ring are used to reduce the friction between the piston 2 and the cylinder 1. The second sealing ring is used to guide the infiltrated hydraulic oil to flow into the oil chamber. The third sealing ring is used to block the infiltration of hydraulic oil on the oil chamber. The fifth sealing ring is used to block the infiltration of gas on the air chamber. The fourth sealing ring is provided with a double-layer sealing layer for blocking the hydraulic oil in the oil chamber and the gas in the air chamber.

[0037] In the embodiment of the utility model, preferably, the sealing member is provided with six groups of sealing rings of different functions and different materials. The functions of the first sealing ring and the sixth sealing ring are to reduce the friction between the piston 2 and the cylinder 1, and to have a certain wear resistance. Polytetrafluoroethylene, etc., which is an excellent wear-resistant material, can be selected. The first sealing ring is close to the oil cavity, and a sealing ring with excellent oil resistance and wear resistance can be selected, which can be nitrile rubber, fluorine rubber, polyurethane, fluorosilicone rubber, etc. The sixth sealing ring is close to the air cavity, and a sealing ring with excellent airtightness and high pressure resistance can be selected, which can be fluorine rubber, polytetrafluoroethylene, etc. The second sealing ring mainly plays a role in The second and third sealing rings have a certain drainage effect, which can drain the hydraulic oil that has penetrated into the oil chamber. The second and third sealing rings, combined with their deeper grooves, can finally block the oil from penetrating into the air chamber. Sealing rings made of materials with good oil resistance and high pressure resistance and more stable performance can be selected. The fourth sealing ring is arranged as a double-layer sealing ring so as to prevent the substances in the oil chamber and the air chamber from mixing into different chambers and affecting the use of the accumulator. The fourth and fifth sealing rings are mainly used to block the gas in the air chamber from entering. Their performance requirements require materials with good airtightness and high pressure resistance, and factors such as gas type, working temperature and pressure requirements also need to be considered.

[0038] like Figure 1-5As shown, as a preferred embodiment of the utility model, the cylinder 1 is configured to be a cylindrical cylinder, and the first end cover 11 and the second end cover 13 are respectively connected to the two ends of the cylinder 1, the first end cover 11 is used to connect with the oil pipe 3, and the inner wall surface of the cylinder 1 is provided with a first annular protrusion and a second annular protrusion, and a first annular mounting groove 22 is provided on one side of the first annular protrusion, and the first annular protrusion and the first annular mounting groove 22 are used to position the first end cover 11, and a second annular mounting groove 22 is provided on one side of the second annular protrusion, and the second annular protrusion and the second annular mounting groove 22 are used to position the second end cover 13.

[0039] In the embodiment of the utility model, preferably, the cylinder 1 is a cylindrical structure with a certain length and thickness, and a first annular protrusion and a second annular protrusion are respectively arranged at both ends of the inner wall surface of the cylinder 1, and the first end cover 11 is jointly positioned by the first annular protrusion and the first annular mounting groove 22 arranged in parallel with the first annular protrusion, and the second end cover 13 is jointly positioned by the second annular protrusion and the second annular mounting groove 22 arranged in parallel with the second annular protrusion.

[0040] like Figure 1-5 As shown, as a preferred embodiment of the utility model, the first end cover 11 is provided with a mounting portion and a connecting portion, and the outer side surface of the mounting portion of the first end cover 11 is provided with a seventh mounting groove 111 and a third annular protrusion, the seventh mounting groove 111 is used to install the seventh sealing ring and cooperate with the first annular protrusion of the cylinder 1 so that the first end cover 11 is connected to the cylinder 1, and the third annular protrusion is embedded in the first annular mounting groove 22; an oil hole is provided at the center position of the connecting portion of the first end cover 11, and the oil pipe 3 is sleeved on the oil hole, and the oil pipe 3 is connected to the hydraulic system through a pin so that hydraulic oil can be input or output in the oil chamber of the piston 2 type hydraulic accumulator through the oil pipe 3.

[0041] In the embodiment of the utility model, preferably, the first end cover 11 can be a disc-shaped end cover with a certain thickness, the first end cover 11 is embedded and installed on the cylinder 1 and the end face of the connecting portion is flush with the end face of the cylinder 1, a seventh mounting groove 111 is provided on the mounting portion to cooperate with the first annular protrusion on the cylinder 1 and a seventh sealing ring is used to prevent the hydraulic oil in the oil chamber from affecting the connection between the first end cover 11 and the cylinder 1, the third annular protrusion can be provided above the seventh mounting groove 111 and close to the connecting portion, the third annular protrusion can be embedded in the first annular mounting groove 22, and a sunken oil hole is provided on the connecting portion of the first end cover 11 to facilitate the installation of the oil pipe 3.

[0042] like Figure 1-5 As shown, as a preferred embodiment of the utility model, two sets of positioning plates 12 are arranged on the first end cover 11 and installed on the connecting part of the first end cover 11, and the positioning plates 12 are used to position the piston 2 type hydraulic accumulator.

[0043] In the embodiment of the utility model, preferably, two sets of positioning plates 12 can be arranged on the connecting part of the first end cover 11, and mounting holes are arranged on the positioning plates 12 to facilitate the installation of the piston 2 type hydraulic accumulator through the latch to completely prevent the piston 2 type hydraulic accumulator from rotating during use and affecting the energy storage effect.

[0044] like Figure 1-5 As shown, as a preferred embodiment of the utility model, an eighth mounting groove 131 and a fourth annular protrusion are provided on the outer side surface of the mounting portion of the second end cover 13, the eighth mounting groove 131 is used to install the eighth sealing ring and cooperate with the second annular protrusion of the cylinder 1 to connect the second end cover 13 to the cylinder 1, the fourth annular protrusion is embedded in the second annular mounting groove 22, an air hole is provided at the center position of the second end cover 13, the air valve 4 is installed on the air hole, and a protective cap 41 is provided on the air valve, and the protective cap 41 is used to prevent impurities from entering the air cavity.

[0045] In the embodiment of the utility model, preferably, the second end cover 13 is embedded in and installed inside the cylinder 1, and cooperates with the second annular protrusion in the cylinder 1 through the eighth installation groove 131 and utilizes the eighth sealing ring to prevent gas leakage in the air cavity from affecting the connection between the second end cover 13 and the cylinder 1, the fourth annular protrusion cooperates with the second annular installation groove 22 to facilitate positioning the connection between the second end cover 13 and the cylinder 1, an air hole can be provided on the end face of the second end cover 13 and a countersunk hole can be provided at one end of the air hole to facilitate the installation of the air valve 4, and a protective cap 41 is provided on the air valve to prevent impurities from entering the air cavity from the air valve through the air hole and affecting the energy storage effect of the accumulator.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A piston hydraulic accumulator, characterized in that: The piston type hydraulic accumulator comprises: A cylinder body, wherein the cylinder body is provided with a first end cover, and the first end cover is connected to the oil pipe; The piston is installed inside the cylinder so that an oil chamber and an air chamber are formed inside the cylinder, and the piston is provided with a plurality of groups of mounting grooves; the mounting grooves include a first type of mounting groove, a second type of mounting groove, a third type of mounting groove and a fourth type of mounting groove, the first type of mounting groove is used to install a buffer seal that reduces friction between the piston and the cylinder, the second type of mounting groove is provided in two groups, the second type of mounting groove is used to install a one-way seal that prevents leakage of hydraulic oil or gas, the third type of mounting groove is used to install a drainage seal that diverts hydraulic oil to the oil chamber, and the fourth type of mounting groove is used to install a bidirectional seal, and the bidirectional seal is used to install to prevent leakage of hydraulic oil and gas.

2. The piston type hydraulic accumulator according to claim 1, characterized in that: The piston is arranged as a columnar structure, and the two end faces of the piston are respectively a first end face and a second end face, an annular protrusion is arranged on the first end face and the outer diameter is the same as the outer diameter of the first end face, a first positioning groove is formed between the first end face and the annular protrusion, the first positioning groove is connected to the oil chamber, a second positioning groove is arranged at the center position of the second end face, and the second positioning groove is connected to the air chamber.

3. The piston type hydraulic accumulator according to claim 2, characterized in that: The piston is also provided with guide grooves, and the guide grooves are provided in multiple groups. The guide grooves are used to prevent the formation of an oil film between the piston and the first end cover. The guide grooves are provided on the annular protrusions on the first end surface, and the guide groove surfaces are higher than the first positioning groove surfaces.

4. The piston type hydraulic accumulator according to claim 1, characterized in that: The mounting groove is arranged as an annular structure, and the mounting groove is arranged in six groups. The six groups of mounting grooves are arranged side by side on the side wall of the piston and are respectively the first mounting groove, the second mounting groove, the third mounting groove, the fourth mounting groove, the fifth mounting groove and the sixth mounting groove. The first mounting groove and the sixth mounting groove are type I mounting grooves and have the same groove depth and groove width. The second mounting groove is type III mounting groove and has a groove depth greater than the groove depth of the first mounting groove, the third mounting groove, the fourth mounting groove, the fifth mounting groove and the sixth mounting groove. The third mounting groove and the fifth mounting groove are type II mounting grooves and have the same groove depth and groove width. The fourth mounting groove is type IV mounting groove and has a groove width greater than the groove width of the first mounting groove, the second mounting groove, the third mounting groove, the fifth mounting groove and the sixth mounting groove.

5. The piston type hydraulic accumulator according to claim 4, characterized in that: The sealing member comprises a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring and a sixth sealing ring. The first sealing ring and the sixth sealing ring are respectively mounted on the first mounting groove and the sixth mounting groove. The first sealing ring and the sixth sealing ring are used to reduce the friction between the piston and the cylinder. The second sealing ring is used to guide the infiltrated hydraulic oil to flow into the oil chamber. The third sealing ring is used to block the infiltration of hydraulic oil from the oil chamber. The fifth sealing ring is used to block the infiltration of gas from the air chamber. The fourth sealing ring is provided with a double-layer sealing layer, which is respectively used to block the hydraulic oil in the oil chamber and the gas in the air chamber.

6. The piston type hydraulic accumulator according to claim 1, characterized in that: The cylinder body is set to a cylindrical shape, and the first end cover and the second end cover are respectively connected to the two ends of the cylinder body. The first end cover is used to connect with the oil pipe. The inner wall of the cylinder body is provided with a first annular protrusion and a second annular protrusion. A first annular mounting groove is provided on one side of the first annular protrusion. The first annular protrusion and the first annular mounting groove are used to position the first end cover. A second annular mounting groove is provided on one side of the second annular protrusion. The second annular protrusion and the second annular mounting groove are used to position the second end cover.

7. The piston type hydraulic accumulator according to claim 6, characterized in that: The first end cover is provided with a mounting portion and a connecting portion, and a seventh mounting groove and a third annular protrusion are provided on the outer side surface of the first end cover mounting portion, the seventh mounting groove is used to install a seventh sealing ring and cooperates with the first annular protrusion of the cylinder body to connect the first end cover with the cylinder body, and the third annular protrusion is embedded in the first annular mounting groove; an oil hole is provided at the center position of the first end cover connecting portion, an oil pipe is sleeved on the oil hole, and the oil pipe is connected to the hydraulic system through a pin so that hydraulic oil can be input or output in the oil chamber of the piston hydraulic accumulator through the oil pipe.

8. The piston type hydraulic accumulator according to claim 6, characterized in that: The first end cover is provided with two sets of positioning plates installed on the connecting portion of the first end cover, and the positioning plates are used to position the piston hydraulic accumulator.

9. The piston type hydraulic accumulator according to claim 6, characterized in that: An eighth mounting groove and a fourth annular protrusion are arranged on the outer side surface of the second end cover mounting portion, the eighth mounting groove is used to install the eighth sealing ring and cooperates with the second annular protrusion of the cylinder body to connect the second end cover to the cylinder body, the fourth annular protrusion is embedded in the second annular mounting groove, an air hole is arranged at the center position of the second end cover, an air valve is arranged on the air hole, a protective cap is arranged on the air valve, and the protective cap is used to prevent impurities from entering the air cavity.

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