Air cylinder end cover structure and air cylinder

Abstract

The invention discloses an air cylinder end cover structure and an air cylinder, and the air cylinder end cover structure comprises an air cylinder end cover which is mounted at the end part of the air cylinder; the moving assembly penetrates through the air cylinder end cover in a sliding and sealing mode. And the adjusting unit is arranged on the air cylinder end cover and used for adjusting the axial displacement of the moving assembly. According to the designed air cylinder end cover structure, the clearance volume of the air cylinder is adjusted through movement of the moving assembly in the air cylinder end cover, then the pressure ratio of the air cylinder is changed, distribution of the pressure ratio of the air cylinder of a two-stage or multi-stage compression hydraulic drive piston compressor is achieved, and the working pressure range of the hydraulic drive piston compressor is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and more particularly to a cylinder end cover structure and a cylinder. Background Art

[0002] Among the three core equipment of hydrogen refueling stations - compressors, hydrogen storage containers and hydrogen refueling machines, compressors play an important role in pressurizing the hydrogen source of hydrogen refueling stations. The performance of compressors directly determines the operating conditions of hydrogen refueling stations. The most commonly used hydrogen compressor in hydrogen refueling stations is a liquid-driven piston compressor. In the existing technical solutions for the cylinder and cylinder end cover structure of liquid-driven piston compressors, the compressor cylinders are mostly fixed volumes.

[0003] Take the two-stage compression liquid-driven piston compressor as an example. Since the structure of the first-stage cylinder and the second-stage cylinder is fixed during the production process, the volume of the first-stage cylinder and the second-stage cylinder is fixed, the gas volume during operation is fixed, and the pressure ratio of the two-stage cylinder is fixed. However, for the two-stage compression liquid-driven piston compressor, its suction pressure may be 5-20MPa, and the exhaust pressure is usually 45MPa. When the suction pressure decreases, the exhaust pressure remains unchanged. The pressure ratio of the first and second stages is fixed. The exhaust temperature of the second stage of the liquid-driven piston compressor will be very high, which will cause damage to the seal at high temperature and affect the normal operation of the compressor.

[0004] When the suction pressure increases, the exhaust pressure remains unchanged, and the pressure ratio between the first and second stages is fixed. The exhaust pressure of the first stage will increase, which will cause insufficient compression in the second stage and affect the normal operation of the compressor.

[0005] Therefore, in actual work, the pressure ratio of the liquid-driven piston compressor may need to be dynamically allocated according to the suction pressure. How to dynamically adjust the suction volume of the first-stage cylinder so that the first-stage pressure ratio can be dynamically adjusted is the key to this type of compressor. Summary of the invention

[0006] The purpose of the present invention is to provide a cylinder end cover structure and a cylinder, in order to solve the technical problems in the background technology.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A cylinder end cover structure, comprising:

[0009] A cylinder end cover, the cylinder end cover being mounted on the end of the cylinder;

[0010] A moving assembly, wherein a sliding seal of the moving assembly is disposed through the cylinder end cover;

[0011] An adjusting unit is arranged on the cylinder end cover and is used for adjusting the axial displacement of the moving component.

[0012] In some embodiments, the moving assembly includes a moving block and a wide-plug, the moving block slides through the cylinder end cover, and the wide-plug is built into the cylinder end cover to achieve sealing between the moving block and the cylinder end cover.

[0013] In some embodiments, the moving block is provided with a clamping platform at one end away from the cylinder, and the cylinder end cover is provided with a clamping slot, and the moving block is limited by the cooperation between the clamping platform and the clamping slot.

[0014] In some embodiments, when the clamping platform of the moving block cooperates with the clamping groove of the cylinder end cover, the other end of the moving block is exactly flush with the other end of the cylinder end cover.

[0015] In some embodiments, the adjusting unit includes: an adjusting bolt, a limit cover, a spring cover, and a spring. The limit cover is installed on the cylinder end cover, the limit cover has a accommodating cavity, the spring cover and the spring are arranged in the accommodating cavity, one end of the spring is connected to the moving component, and the other end of the spring is arranged in the spring cover. The adjusting bolt passes through the spring cover and is threadedly connected to the limit cover; the adjusting bolt is used to drive the spring cover to move axially.

[0016] In some embodiments, the left and right sides of the spring cover are respectively provided with limiting grooves, and the limiting groove on one side is used to limit the spring; a plane bearing is installed in the limiting groove on the other side, and the adjusting bolt is connected to the plane bearing.

[0017] This embodiment also provides a cylinder, comprising any of the cylinder end cover structures described above.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] (1) The cylinder end cover structure designed in the present invention utilizes the movement of the position of the moving component in the cylinder end cover to adjust the clearance volume of the cylinder, thereby changing the pressure ratio of the cylinder, realizing the distribution of the cylinder pressure ratio of the two-stage or multi-stage compression liquid-driven piston compressor, and widening the working pressure range of the liquid-driven piston compressor.

[0020] (2) The cylinder end cover structure designed in the present invention utilizes the clamping platform and the limit cover of the cylinder end cover to limit the upper and lower limit positions of the moving component, utilizes the spring and the adjusting bolt preload to balance the gas force in the cylinder, and utilizes the plane bearing to convert the rotational motion of the bolt into the translational motion of the moving component, which is beneficial to the stability of the moving component during the operation of the liquid-driven piston compressor, ensures the working stability of the liquid-driven piston compressor, and improves the working efficiency of the liquid-driven piston compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The cylinder end cover structure of the present invention.

[0022] Illustration: 1-adjusting bolt, 2-limiting cover, 3-spring cover, 4-plane bearing, 5-spring, 6-moving block, 7-pan plug, 8-cylinder end cover, 9-cylinder. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0024] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0028] The following will be combined Figure 1 , a cylinder end cover structure and a cylinder involved in the embodiments of the present application are described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0029] Embodiment 1:

[0030] See also Figure 1 A cylinder end cover structure and a cylinder, comprising an adjusting bolt 1, a limit cover 2, a spring cover 3, a plane bearing 4, a spring 5, a wide plug 7, a cylinder end cover 8, and a cylinder 9. A moving assembly, an adjusting unit, the cylinder end cover is mounted on the end of the cylinder; the moving assembly sliding seal is arranged through the cylinder end cover; the adjusting unit is arranged on the cylinder end cover, and is used to adjust the displacement of the moving assembly in the axial direction.

[0031] The axial displacement of the moving component is changed by the adjusting unit, and the relative position of the moving component in the cylinder end cover is changed, so as to adjust the clearance volume of the cylinder, and then change the pressure ratio of the cylinder, thereby realizing stepless adjustment of the cylinder pressure ratio.

[0032] In some embodiments, the moving assembly includes a moving block 6 and a universal plug. The moving block 6 slides through the cylinder end cover. The universal plug is built into the cylinder end cover to achieve sealing between the moving block 6 and the cylinder end cover. The universal plug 7 is used for sealing to prevent the gas in the cylinder 9 from leaking outward through the gap formed between the cylinder end cover 8 and the moving assembly. The moving block 6 is provided with a clamping platform at the end away from the cylinder, and the cylinder end cover is provided with a clamping slot. The moving block 6 is limited by the clamping platform and the clamping slot.

[0033] The adjusting unit comprises: an adjusting bolt, a limit cover, a spring cover and a spring. The limit cover is installed on the cylinder end cover. The limit cover has a receiving cavity. The spring cover and the spring are arranged in the receiving cavity. One end of the spring is connected to the moving component, and the other end of the spring is arranged in the spring cover. The adjusting bolt passes through the spring cover and is threadedly connected to the limit cover. The adjusting bolt is used to drive the spring cover to move in the axial direction.

[0034] In the present invention, the adjusting bolt 1 and the limit cover 2 are matched through threads. When the adjusting bolt 1 is rotated, the plane bearing 4 matched with the adjusting bolt 1 will convert the rotational motion into translational motion. The plane bearing 4 is assembled in the spring cover 3, so that the spring cover 3 moves translationally, and the movement of the spring cover 3 will drive the spring 5 to stretch or compress, and the spring 5 will drive the moving component to change the relative position of the moving component in the cylinder end cover 8, thereby adjusting the clearance volume of the cylinder 9, and then changing the pressure ratio of the cylinder 9, thereby realizing stepless adjustment of the pressure ratio of the cylinder 9.

[0035] In some embodiments, when the clamping platform of the moving block 6 cooperates with the clamping groove of the cylinder end cover, the other end of the moving block 6 is just flush with the other end of the cylinder end cover. This position is the lower limit position of the moving assembly in the present invention, that is, the lower end surface of the moving assembly completely overlaps with the lower end surface of the cylinder end cover 8. At this time, the clearance volume in the cylinder 5 reaches the minimum value, and the clamping platform of the cylinder end cover 8 limits the further downward movement of the moving assembly.

[0036] The upper limit position of the moving assembly in the present invention is that the inner plane of the limit cover 1 is completely in contact with the upper surface of the spring cover 3, thereby limiting the upward movement of the moving assembly 2. When the moving assembly 2 is in the upper limit position, the clearance volume in the cylinder 5 reaches the maximum value, and the limit cover 2 is connected to the cylinder end cover 8 by bolts.

[0037] In the present invention, a threaded hole is provided in the center of the limit cover 2, and the limit cover 2 is connected to the adjusting bolt 1 by threads. When the adjusting bolt 1 is at a certain position, the gas pressure in the cylinder 9, the spring force of the spring 5, and the bolt preload between the limit cover 1 and the cylinder end cover 8 are balanced.

[0038] This embodiment also provides a cylinder, including any of the above-mentioned cylinder end cover structures. The present invention adds a movable component with adjustable displacement to the original cylinder end cover, and adjusts the clearance volume inside the first-stage cylinder by moving the movable component forward and backward in the cylinder end cover, thereby changing the gas volume of the first-stage cylinder, thereby changing the pressure ratio of the first-stage cylinder, and realizing dynamic distribution of the pressure ratio of the cylinders of a two-stage or multi-stage compression liquid-driven piston compressor.

[0039] The above description is only a preferred embodiment of the present invention and is used to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylinder end cover structure, characterized in that: include: A cylinder end cover, the cylinder end cover being mounted on the end of the cylinder; A moving assembly, wherein a sliding seal of the moving assembly is disposed through the cylinder end cover; An adjusting unit is arranged on the cylinder end cover and is used for adjusting the axial displacement of the moving component.

2. A cylinder end cover structure according to claim 1, characterized in that: The moving assembly comprises a moving block and a wide plug. The moving block slides through the cylinder end cover. The wide plug is built in the cylinder end cover to achieve sealing between the moving block and the cylinder end cover.

3. A cylinder end cover structure according to claim 2, characterized in that: The moving block is provided with a clamping platform at one end away from the cylinder, and the cylinder end cover is provided with a clamping slot, and the moving block is limited by the cooperation between the clamping platform and the clamping slot.

4. A cylinder end cover structure according to claim 3, characterized in that: When the clamping platform of the moving block is matched with the clamping groove of the cylinder end cover, the other end of the moving block is just flush with the other end of the cylinder end cover.

5. The cylinder end cover structure according to claim 1, characterized in that: The adjusting unit comprises: an adjusting bolt, a limit cover, a spring cover and a spring. The limit cover is installed on the cylinder end cover. The limit cover has a receiving cavity. The spring cover and the spring are arranged in the receiving cavity. One end of the spring is connected to the moving component, and the other end of the spring is arranged in the spring cover. The adjusting bolt passes through the spring cover and is threadedly connected to the limit cover. The adjusting bolt is used to drive the spring cover to move in the axial direction.

6. A cylinder end cover structure according to claim 5, characterized in that: The left and right sides of the spring cover are respectively provided with limiting grooves, and the limiting groove on one side is used to limit the spring; the limiting groove on the other side is installed with a plane bearing, and the adjusting bolt is connected to the plane bearing.

7. A cylinder, characterized in that: It comprises the cylinder end cover structure described in any one of claims 1-6.

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