A bladder damage detection device for bladder type accumulator

Abstract

The present invention belongs to the field of auxiliary detection of fluid hydraulic accumulators, and relates to a bladder damage detection device for a bladder accumulator, comprising a guide plate, a valve assembly and a detection element. The guide plate is fixedly connected to the oil inlet valve of the bladder accumulator, and a curved slide rail is provided on the guide plate; the valve assembly comprises a valve sleeve, a valve core and an elastic element, the valve sleeve penetrates and is fixedly and sealedly connected to the oil valve body of the bladder accumulator, the valve core is sleeved in the valve sleeve and connected to the valve sleeve sliding seal, the elastic element is sleeved in the valve sleeve, one end of the elastic element is connected to the valve sleeve, and the other end is connected to the valve core; one end of the valve core is slidably connected to the curved slide rail in a direction perpendicular to the valve core, and the sliding stroke of the valve core on the curved slide rail is smaller than the moving stroke of the oil inlet valve, so that the valve core has a normal state of sliding connection with the curved slide rail and a derailed state of detaching from the curved slide rail, and the other end of the valve core is connected to a detection element for detecting the displacement and / or force of the valve core.

Description

Technical Field

[0001] The invention belongs to the field of auxiliary detection of fluid hydraulic accumulators and relates to a bladder damage detection device for a bladder type accumulator. Background Art

[0002] As an indispensable component in modern fluid hydraulic technology, the bladder accumulator can store hydraulic energy, absorb pressure shock, maintain constant pressure, buffer pressure pulsation by compressing the bladder pre-filled with nitrogen, and compensate for flow fluctuations in the hydraulic system. It is widely used in every hydraulic system that needs to provide safety and reliability.

[0003] The bladder accumulator is a liquid-gas isolation accumulator. The bladder is built into a closed steel pressure vessel. It uses the compressibility of the gas in the bladder to absorb or release pressure energy. The bladder accumulator includes a shell, a bladder, an air charging valve, an oil inlet valve (mushroom valve) and an oil valve body for installing the oil inlet valve. The air charging valve and the oil valve body are fixedly connected to the shell, and the open end of the bladder is connected to the air charging valve. The oil inlet valve is installed in the oil valve body. The oil inlet valve remains in a normally open state under the action of the oil inlet valve spring to adjust the oil flow through the shell. When the air bag is fully expanded, the oil inlet valve moves downward to close the inlet, and it is in a completely depressurized state. However, due to the influence of factors such as material aging, pressure fatigue, temperature changes and oil cleanliness, the bladder is inevitably damaged, and there are large differences in individual service life; the damage of the bladder will cause the accumulator function of the hydraulic system to fail, and its working condition is invisible, unpredictable and difficult to diagnose, especially in hydraulic systems with multiple accumulators. At present, most users use the on-site hand-touching and ear-listening method to determine the working status of the bladder of the bladder accumulator by inspectors, which not only increases the risk of contact between people and working equipment, but also lacks efficiency, reliability and safety in manual judgment, especially in long-term unattended application sites without inspection conditions.

[0004] Therefore, the present invention proposes a bladder damage detection device for a bladder accumulator, which can achieve both on-site display and remote signal transmission. It is an urgent need to ensure the normal operation of the entire hydraulic system, and is also a support point for the development of hydraulic technology applications towards energy saving and consumption reduction and intelligent status detection. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a bladder damage detection device for a bladder accumulator, which is used for bladder damage detection of the bladder accumulator, accurately and efficiently judges the working state of the bladder of the bladder accumulator, and reduces the risk of contact between the operator and the equipment on which the operator is working.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A bladder damage detection device for a bladder accumulator, the bladder damage detection device is fixedly connected to the bladder accumulator, comprising a guide plate, a valve assembly and a detection element, the guide plate is fixedly connected to the oil inlet valve of the bladder accumulator to move with the oil inlet valve, and a curved slide rail is provided on the guide plate;

[0008] The valve assembly includes a valve sleeve, a valve core and an elastic element. The valve sleeve penetrates and is fixedly connected to the oil valve body of the bladder accumulator. A sealing ring is provided between the valve sleeve and the oil valve body for sealing connection. The valve core is sleeved in the valve sleeve and connected to the valve sleeve in a sliding seal. The elastic element is sleeved in the valve sleeve, and one end of the elastic element is connected to the valve sleeve, and the other end is connected to the valve core to give the valve core an axial force and limit the axial travel of the valve core.

[0009] One end of the valve core is slidably connected to the curved slide rail in a direction perpendicular to the valve core, and the sliding stroke of the valve core on the curved slide rail is smaller than the moving stroke of the oil inlet valve, so that the valve core has a normal state of being slidably connected to the curved slide rail and a derailed state of being detached from the curved slide rail, and the other end of the valve core is connected to a detection element for detecting the displacement and / or force of the valve core, and the detection element is connected to an external detection system.

[0010] Furthermore, a ball bearing slidably connected to the valve sleeve is provided on one side of the valve core close to the curved slide rail to increase the connection flexibility between the valve core and the curved slide rail, and an opening on one side of the valve sleeve close to the curved slide rail is smaller than the outer diameter of the ball bearing to limit the position of the ball bearing.

[0011] Furthermore, one end of the curved slide rail close to the oil inlet valve is configured as an arc section to facilitate state switching of the valve core.

[0012] Furthermore, the valve sleeve includes a valve sleeve body and a compression sleeve. The valve sleeve body passes through and is fixedly and sealedly connected to the oil valve body of the bladder accumulator. The compression sleeve is sleeved inside the valve sleeve body, and the end of the compression sleeve away from the curved slide rail is crimped to the end of the valve sleeve body away from the curved slide rail. The length of the compression sleeve is smaller than the length of the valve sleeve body. The valve core passes through the compression sleeve and is connected to the compression sleeve sliding seal. The elastic element is connected to the valve sleeve through the compression sleeve.

[0013] Furthermore, the valve sleeve further comprises a positioning sleeve, the positioning sleeve is fixedly connected to one end of the pressing sleeve close to the curved slide rail, and the outer diameter of the positioning sleeve is smaller than the outer diameter of the pressing sleeve;

[0014] A guide ring is sleeved on one end of the valve core close to the curved slide rail, and the outer diameter of the guide ring is larger than the positioning sleeve to limit the stroke of the valve core.

[0015] Furthermore, the elastic element includes a stop spring and a return spring. The stop spring is sleeved on the valve core, one end of which is connected to the positioning sleeve and the other end is connected to the guide ring. The return spring is sleeved on the positioning sleeve, one end of which is connected to the pressing sleeve and the other end is connected to the guide ring.

[0016] Furthermore, the valve sleeve is provided with an oil drain port, and the oil drain port is located on a side of the valve sleeve close to the inner cavity of the oil valve body of the bladder accumulator.

[0017] Furthermore, the valve sleeve is pressed against the oil valve body by a fixing screw arranged on a side of the valve sleeve away from the curved slide rail, and the fixing screw is a hollow structure for mounting a detection element.

[0018] Furthermore, the detection element includes a displacement sensor and / or a piezoelectric sensor to detect the displacement and / or force state of the valve core and transmit the information to an external detection system.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a bladder damage detection device for a bladder accumulator, which detects the displacement change of the oil inlet valve through a detection element, a valve assembly and a guide plate. The expansion of an intact bladder will push the oil inlet valve to move, thereby driving the guide plate to move it downward, and the valve core changes from a normal state to a derailed state. The detection element detects a change signal due to the axial movement of the valve core, thereby determining that the bladder is intact; while the damaged bladder cannot expand and cannot contact and push the oil inlet valve to move it, and then the guide plate does not move, and the valve core always maintains a normal state connected to the curved slide rail without a state change, so the detection element cannot detect a change signal due to the inability of the valve core to move axially, thereby determining that the bladder is damaged; the bladder damage detection device can achieve both on-site display and remote signal transmission, which is a practical need to ensure the normal operation of the entire hydraulic system, provides a valuable means for incorporating the bladder accumulator into system status monitoring, and reduces the risk of contact between people and working equipment, especially provides an efficient and reliable detection means for long-term unattended bladder accumulators that do not have inspection conditions.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 Schematic diagram of the structure of the bladder damage detection device of the bladder accumulator in the normal working state in the embodiment;

[0024] Figure 2 for Figure 1 Schematic diagram of the local structure;

[0025] Figure 3 for Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0026] Figure 4 It is a structural schematic diagram of a bladder damage detection device in a bladder accumulator in a fully depressurized state in an embodiment;

[0027] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of B;

[0028] Figure 6 Schematic diagram of the structure of the bladder damage detection device when the bladder of the bladder accumulator is damaged in the embodiment.

[0029] Figure numerals: bladder 11, oil valve body 12, oil inlet valve 13, damping sleeve 14, nut 15, oil inlet valve spring 16, charging valve 17, housing 18, curved slide rail 21, valve sleeve body 22, ball 23, guide ring 24, valve core 25, press sleeve 26, fixing screw 27, detection element 28, stop spring 41, positioning sleeve 42, sealing ring 43, reset spring 44, oil drain port 45, retaining ring 46, guide plate 51, arc segment 511, crushing bladder 61. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] See also Figure 1 to Figure 6 , which is a bladder damage detection device for a bladder accumulator, the bladder accumulator includes a shell 18, a bladder 11, a charging valve 17, an oil inlet valve 13 (mushroom-shaped valve) and an oil valve body 12 for installing the oil inlet valve 13, the charging valve 17 and the oil valve body 12 are fixedly connected to the shell 18, the open end of the bladder 11 is connected to the charging valve 17, the oil inlet valve 13 is installed in the oil valve body 12, the oil inlet valve 13 includes an oil inlet valve spring 16, a damping sleeve 14 and a nut 15 which are sleeved on the oil inlet valve body from top to bottom, the oil inlet valve 13 is kept in a normally open state under the action of the oil inlet valve spring 16, so as to adjust the oil flow through the shell 18. When the airbag is fully expanded, the oil inlet valve 13 moves downward to close the inlet, and is now in a fully depressurized state. Key references Figure 6When the bladder 11 is damaged, when the broken bladder 61 performs the action of completely releasing pressure, the bladder 11 cannot expand and cannot contact and push the oil inlet valve 13 to make it move. The bladder damage detection device is fixedly connected to the bladder accumulator, and includes a guide plate 51, a valve assembly and a detection element 28. The guide plate 51 is fixedly connected to the oil inlet valve 13 of the bladder accumulator to move with the oil inlet valve 13. Specifically, one side of the guide plate 51 is fixedly connected between the damping sleeve 14 and the nut 15 to move up and down with the oil inlet valve 13 in the oil valve body away from the housing 18. A curved slide rail 21 is provided on the other end of the guide plate 51, and the curved slide rail 21 is parallel to the axis of the oil inlet valve 13; the valve assembly includes a valve sleeve, a valve core 25 and an elastic element, the valve sleeve passes through and is fixedly and sealedly connected to the oil valve body 12 of the bladder accumulator, the valve core 25 is sleeved in the valve sleeve and connected to the valve sleeve in a sliding seal, the elastic element is sleeved in the valve sleeve, and one end of the elastic element is connected to the valve sleeve, and the other end is connected to the valve core 25 to give the valve core 25 an axial force and limit the axial stroke of the valve core 25; one end of the valve core 25 is slidably connected to the curved slide rail 21 in a direction perpendicular to the valve core 25, and the sliding stroke of the valve core 25 on the curved slide rail 21 is less than the moving stroke of the oil inlet valve 13, so that the valve core 25 has a normal state of sliding connection with the curved slide rail 21 and a derailed state of being separated from the curved slide rail 21, and the other end of the valve core 25 is connected to a detection element 28 for detecting the displacement and / or force of the valve core 25.

[0034] In this embodiment, the displacement change of the oil inlet valve 13 is detected by the detection element 28, the valve assembly and the guide plate 51. The expansion of the intact bladder 11 will push the oil inlet valve 13 to move, thereby driving the guide plate 51 to move it downward, and the valve core 25 changes from the normal state to the derailed state. The detection element 28 detects the change signal due to the axial movement of the valve core 25, thereby determining that the bladder 11 is intact; while the damaged bladder 11 cannot expand and cannot contact and push the oil inlet valve 13 to move it, and then the guide plate 51 does not move either. The valve core 25 always maintains a normal state connected to the curved slide rail 21 without a state change. Therefore, the detection element 28 cannot detect the change signal because the valve core 25 cannot move axially, thereby determining that the bladder 11 is damaged.

[0035] In this embodiment, a ball 23 slidably connected to the valve sleeve is provided on the side of the valve core 25 close to the curved slide rail 21 to increase the connection flexibility between the valve core 25 and the curved slide rail 21, and the opening of the valve sleeve close to the curved slide rail 21 is smaller than the outer diameter of the ball 23 to limit the position of the ball 23; the end of the curved slide rail 21 close to the oil inlet valve 13 is set as an arc segment 511 to facilitate the state switching of the valve core 25.

[0036] Specifically, the valve sleeve includes a valve sleeve body 22, a positioning sleeve 42 and a pressing sleeve 26. The valve sleeve body 22 passes through and is fixedly and sealedly connected to the oil valve body 12 of the bladder accumulator. The pressing sleeve 26 is sleeved inside the valve sleeve body 22, and the end of the pressing sleeve 26 away from the curved slide rail 21 is crimped to the end of the valve sleeve body 22 away from the curved slide rail 21. The length of the pressing sleeve 26 is smaller than the length of the valve sleeve body 22. The valve core 25 passes through the pressing sleeve 26 and is connected to the pressing sleeve 26 in a sliding and sealing manner. The elastic element is connected to the valve sleeve through the pressing sleeve 26. The positioning sleeve 42 is fixedly connected to the end of the pressing sleeve 26 close to the curved slide rail 21, and the outer diameter of the positioning sleeve 42 is smaller than the outer diameter of the pressing sleeve 26. A guide ring 24 is sleeved on the end of the valve core 25 close to the curved slide rail 21, and the outer diameter of the guide ring 24 is larger than the positioning sleeve 42 to limit the stroke of the valve core 25.

[0037] The elastic element includes a stop spring 41 and a return spring 44. The stop spring 41 is sleeved on the valve core 25, one end of which is connected to the positioning sleeve 42, and the other end is connected to the guide ring 24. The return spring 44 is sleeved on the positioning sleeve 42, one end of which is connected to the pressing sleeve 26, and the other end is connected to the guide ring 24. The valve sleeve is provided with an oil drain port 45, and the oil drain port 45 is located on the side of the valve sleeve close to the inner cavity of the oil valve body 12 of the bladder accumulator to ensure the oil pressure balance when the valve core 25 moves.

[0038] In this embodiment, the valve sleeve is pressed onto the oil valve body 12 by a fixing screw 27 arranged on the side of the valve sleeve away from the curved slide rail 21, and the fixing screw 27 is a hollow structure for installing a detection element 28. Sealing rings 43 are provided between the valve sleeve and the oil valve body 12, between the valve sleeve and the pressing sleeve 26, and between the pressing sleeve 26 and the valve core 25 to ensure that the hydraulic oil does not leak.

[0039] In another embodiment, the valve sleeve is pressed onto the oil valve body 12 by a pressure cover arranged on a side of the valve sleeve away from the curved guide rail 21 .

[0040] Furthermore, the detection element 28 includes a displacement sensor and / or a piezoelectric sensor, and the detection element 28 is connected to an external detection system to detect the displacement and / or force state of the valve core 25 and transmit the information to the external detection system.

[0041] The detection principle of a bladder damage detection device for a bladder type accumulator provided in this embodiment is as follows:

[0042] When the bladder accumulator works normally, the oil inlet valve 13 is in an open state under the action of the oil inlet valve spring 16, and the inflatable bladder 11 expands and compresses freely to discharge and absorb oil. Under the action of the return spring 44, the valve core 25 pushes the ball 23 to make it close to the opening of the valve sleeve close to the curved slide rail 21 and close to the curved slide rail 21. The curved slide rail 21 prevents the ball 23 from moving further and feeds back the elastic force of the return spring 44 to the valve core 25.

[0043] When the bladder accumulator performs a full pressure relief action, the bladder 11 is fully expanded and contacts and pushes the oil inlet valve 13 to move downward, and the guide plate 51 (the curved slide rail 21 on the guide plate 51) also moves downward. The sliding stroke of the valve core 25 on the curved slide rail 21 is smaller than the downward movement stroke of the oil inlet valve 13, so that the curved slide rail 21 is disengaged from the ball 23. Under the action of the reset spring 44, the valve core 25 further pushes the ball 23 to move toward the side of the opening of the valve sleeve and makes it close to the opening of the valve sleeve. However, since the opening of the side of the valve sleeve close to the curved slide rail 21 is smaller than the outer diameter of the ball 23, the position of the ball 23 is limited, so the ball 23 will not fall off. At this time, the change in position or force caused by the movement of the valve core 25 is detected by the detection element 28 installed on the fixing screw 27 (or the pressure cover), and the detection signal is displayed on site or transmitted remotely.

[0044] When the bladder accumulator is recharged, the high-pressure oil pushes the inlet valve 13 upward and compresses the inflatable bladder 11, and also drives the guide plate 51 upward, and the curved slide rail 21 contacts the ball 23 again, squeezing the ball 23 to push the valve core 25 to overcome the spring force of the return spring 44 to perform axial horizontal movement, while the stop spring 41, the positioning sleeve 42 and the pressure sleeve 26 can limit the maximum displacement of the valve core 25 in this case. The guide ring 24 and the oil drain port 45 also help the valve core 25 to perform stable horizontal movement whether it is fully depressurized or charged.

[0045] However, when the pressure is released after the bladder 11 is damaged, the broken bladder 61 cannot expand and cannot contact and push the oil inlet valve 13 to move it. The detection element 28 cannot detect the change signal because the valve core 25 cannot move axially horizontally. It can be determined that the inflatable bladder 11 is damaged.

[0046] The present embodiment provides a bladder damage detection device for a bladder accumulator, which can accurately and efficiently judge the working state of the bladder 11 in the bladder accumulator, reduce the risk of contact between the operator and the equipment being worked, and can display the working state of the bladder 11 locally and transmit the signal remotely, which is a practical need to ensure the normal operation of the entire hydraulic system, provides a valuable means for incorporating the bladder accumulator into the system status monitoring, and reduces the risk of contact between people and working equipment, especially provides an efficient and reliable detection means for the bladder accumulator that is unattended for a long time and does not have the conditions for inspection.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A bladder damage detection device for a bladder accumulator, the bladder damage detection device being fixedly connected to the bladder accumulator, characterized in that: It comprises a guide plate (51), a valve assembly and a detection element (28), wherein the guide plate (51) is fixedly connected to an oil inlet valve (13) of a bladder accumulator to move along with the oil inlet valve (13), and a curved slide rail (21) is provided on the guide plate (51); The valve assembly comprises a valve sleeve, a valve core (25) and an elastic element. The valve sleeve penetrates and is fixedly connected to the oil valve body (12) of the bladder accumulator. A sealing ring (43) is provided between the valve sleeve and the oil valve body (12) for sealing connection. The valve core (25) is sleeved in the valve sleeve and is connected to the valve sleeve in a sliding seal. The elastic element is sleeved in the valve sleeve, and one end of the elastic element is connected to the valve sleeve, and the other end is connected to the valve core (25) to impart an axial force to the valve core (25) and limit the axial travel of the valve core (25). One end of the valve core (25) is slidably connected to the curved slide rail (21) in a direction perpendicular to the valve core (25), and the sliding stroke of the valve core (25) on the curved slide rail (21) is smaller than the moving stroke of the oil inlet valve (13), so that the valve core (25) has a normal state of being slidably connected to the curved slide rail (21) and a derailed state of being separated from the curved slide rail (21), and the other end of the valve core (25) is connected to a detection element (28) for detecting displacement and / or force of the valve core (25), and the detection element (28) is connected to an external detection system; One end of the curved slide rail (21) close to the oil inlet valve (13) is configured as an arc segment (511) to facilitate state switching of the valve core (25).

2. The bladder damage detection device for a bladder accumulator according to claim 1, characterized in that: A ball (23) slidably connected to the valve sleeve is provided on a side of the valve core (25) close to the curved slide rail (21) to increase the connection flexibility between the valve core (25) and the curved slide rail (21), and an opening of the valve sleeve close to the curved slide rail (21) is smaller than the outer diameter of the ball (23) to limit the position of the ball (23).

3. The bladder damage detection device for a bladder accumulator according to claim 1, characterized in that: The valve sleeve comprises a valve sleeve body (22) and a pressing sleeve (26); the valve sleeve body (22) penetrates and is fixedly and sealingly connected to the oil valve body (12) of the bladder (11) type accumulator; the pressing sleeve (26) is sleeved inside the valve sleeve body (22); and one end of the pressing sleeve (26) away from the curved slide rail (21) is crimped to one end of the valve sleeve body (22) away from the curved slide rail (21); the length of the pressing sleeve (26) is shorter than the length of the valve sleeve body (22); the valve core (25) penetrates the pressing sleeve (26) and is slidingly and sealingly connected to the pressing sleeve (26); and the elastic element is connected to the valve sleeve through the pressing sleeve (26).

4. The bladder damage detection device for a bladder accumulator according to claim 3, characterized in that: The valve sleeve further comprises a positioning sleeve (42), wherein the positioning sleeve (42) is fixedly connected to an end of the pressing sleeve (26) close to the curved slide rail (21), and an outer diameter of the positioning sleeve (42) is smaller than an outer diameter of the pressing sleeve (26); A guide ring (24) is sleeved on one end of the valve core (25) close to the curved slide rail (21); the outer diameter of the guide ring (24) is larger than the positioning sleeve (42) so as to limit the travel of the valve core (25).

5. The bladder damage detection device for a bladder accumulator according to claim 4, characterized in that: The elastic element comprises a stop spring (41) and a return spring (44); the stop spring (41) is sleeved on the valve core (25), one end of which is connected to the positioning sleeve (42) and the other end of which is connected to the guide ring (24); the return spring (44) is sleeved on the positioning sleeve (42), one end of which is connected to the pressing sleeve (26) and the other end of which is connected to the guide ring (24).

6. The bladder damage detection device for a bladder accumulator according to claim 1, characterized in that: The valve sleeve is provided with an oil drain port (45), and the oil drain port (45) is located on a side of the valve sleeve close to the inner cavity of the oil valve body (12) of the bladder (11) type accumulator.

7. The bladder damage detection device for a bladder accumulator according to claim 1, characterized in that: The valve sleeve is pressed against the oil valve body (12) by a fixing screw (27) arranged on a side of the valve sleeve away from the curved slide rail (21), and the fixing screw (27) is a hollow structure for mounting a detection element (28).

8. The bladder damage detection device for a bladder accumulator according to claim 1, characterized in that: The detection element (28) comprises a displacement sensor and / or a piezoelectric sensor to detect the displacement and / or force state of the valve core (25) and transmit the detection state to an external detection system.

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