A nitrogen spring with self-lubricating function

Abstract

The present invention is applicable to the technical field related to molds, and provides a nitrogen spring with self-lubricating function, including a cylinder body and a piston rod, and also including: an inflation component, the base is a hollow structure, the inflation component is sealed and arranged at the bottom of the base, and the inflation component is detachable; a capillary hole, the bottom of the guide cylinder sleeve and the top of the base are sealed and fixed in the cylinder barrel, a second inner cavity is formed between the connection position of the guide cylinder sleeve and the base and the inner wall of the cylinder barrel, the inner wall of the guide cylinder sleeve and the bottom part of the piston rod and the top hollow part of the base form a first inner cavity, the capillary hole is opened on the base and is used to connect the first inner cavity and the second inner cavity, the beneficial effect of the present invention is: when the piston rod moves upward, the inner wall of the cylinder barrel is cooled by oil mist, and when the piston rod rises, the liquid lubricating oil lubricates the piston seal and the inner wall of the guide cylinder sleeve through the oil mist, thereby improving the service life of the nitrogen spring.

Description

Technical Field

[0001] The invention belongs to the technical field related to molds, and in particular relates to a nitrogen spring with a self-lubricating function. Background Art

[0002] As nitrogen springs are increasingly used, some molds (such as micro motor housings, etc.) and equipment have higher and higher requirements for the number of times nitrogen springs are used, and some molds have a production volume of tens of millions. However, the number of times ordinary nitrogen springs on the market are generally only 1-2 million times, which is far from the service life of the mold.

[0003] It is well known that the service life of nitrogen springs is mainly affected by superior seals and good self-lubricating structure. Most of the seals are from several well-known brands in the world with little difference. Therefore, the focus is on the design structure of the nitrogen spring. The most important thing in designing the nitrogen spring structure is to have a good self-lubricating structure.

[0004] At present, most domestic manufacturers use support rings or guide belts with self-lubricating function. However, these materials cannot support the nitrogen spring to reach millions or more times of use (i.e. service life), so the present invention uses liquid lubricating oil mist to further lubricate on the basis of the original self-lubricating guide belt or support ring, and the generated oil mist can directly lubricate the sealing ring. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a nitrogen spring with a self-lubricating function, aiming to solve the problems existing in the prior art identified in the background technology.

[0006] The embodiment of the present invention is implemented as follows: a nitrogen spring with a self-lubricating function includes a cylinder body and a piston rod, the cylinder body includes a cylinder barrel and a guide cylinder sleeve installed on the top of the cylinder barrel, a base is installed at the bottom of the cylinder barrel, the piston rod is movably arranged on the guide cylinder sleeve and can slide relatively along the top of the guide cylinder sleeve, and the connection position of the piston rod and the guide cylinder sleeve is respectively provided with a guide ring for guiding the piston rod and a piston seal for active sealing, and also includes:

[0007] Inflatable component, the base is a hollow structure, the inflatable component is sealed and arranged at the bottom of the base, and the inflatable component is detachable;

[0008] The capillary hole is formed on the bottom of the guide cylinder sleeve and the top of the base and is sealed and fixed in the cylinder barrel. A second inner cavity is formed between the connecting position of the guide cylinder sleeve and the base and the inner wall of the cylinder barrel. A first inner cavity is formed between the inner wall of the guide cylinder sleeve and the bottom part of the piston rod and the top hollow part of the base. The capillary hole is formed on the base and is used to connect the first inner cavity and the second inner cavity.

[0009] The first inner cavity is provided with a portion of lubricating oil. When high-pressure nitrogen is injected into the first inner cavity through the inflation component, the pressure between the first inner cavity and the second inner cavity is kept equal, and the lubricating oil immerses the capillary pores;

[0010] When the piston rod is compressed by external force and moves downward rapidly, the space of the first inner cavity becomes smaller and the pressure in the first inner cavity increases suddenly;

[0011] When the piston rod rises rapidly after the external force is released, the space of the first inner cavity increases and the pressure in the first inner cavity decreases suddenly.

[0012] Preferably, a sealing ring is further provided at the connection position between the piston rod and the guide cylinder sleeve, and the sealing ring is arranged at the top position of the piston seal.

[0013] Preferably, an inner dust ring and a support ring are sequentially mounted on the inner wall of the guide cylinder sleeve and close to the outer side. The inner dust ring and the support ring are respectively sleeved on the piston rod and are arranged sequentially from the outside to the inside.

[0014] Preferably, the guide cylinder sleeve is connected to the top of the cylinder barrel through a first thread pair and a static seal.

[0015] Preferably, the inflatable component comprises:

[0016] An inflation check valve, which is installed in the hollow part of the base and is used to conduct forward flow when gas is injected and to cut off reverse flow;

[0017] Sealing screw, used to seal the inflation check valve in the hollow structure.

[0018] Preferably, the base is connected to the bottom of the cylinder through a second thread pair and a static seal.

[0019] Preferably, the bottom of the guide cylinder sleeve and the top connection position of the base are sealed and fixed by a second static seal.

[0020] Preferably, a limit ring is provided on the top of the piston rod, and the limit ring is used to prevent the piston rod from falling into the guide cylinder sleeve before inflation.

[0021] A nitrogen spring with a self-lubricating function provided by an embodiment of the present invention can make the oil mist adhere to the wall of the second inner cavity, especially the inner wall of the cylinder barrel, when the piston rod is forced to move downward rapidly, so as to play a good cooling role. On the contrary, when the external force is released, the piston rod quickly rises, and the oil mist is attached to the piston seal and the inner wall of the guide cylinder sleeve, completing a lubrication cycle and providing a good lubrication environment for the next downward movement of the piston rod, thereby increasing the service life of the piston seal (i.e., the service life of the nitrogen spring) by reducing the friction coefficient of the piston seal and the inner wall of the guide cylinder sleeve during operation and reducing the internal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A front view of a nitrogen spring with self-lubricating function provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of the downlink provided by an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the uplink structure provided by an embodiment of the present invention.

[0025] In the attached figure: 1. piston rod; 2. guide cylinder sleeve; 3. cylinder barrel; 4. base; 5. static seal 1; 6. static seal 2; 7. static seal 3; 8. inner dust ring; 9. guide ring; 10. sealing retaining ring; 11. piston seal; 12. lubricating oil; 13. capillary; 14. support ring; 15. inflation check valve; 16. sealing screw; 17. limit retaining ring; 18. first inner cavity; 19. second inner cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0028] like Figure 1-3 The figure is a structural diagram of a nitrogen spring with self-lubricating function provided by an embodiment of the present invention, comprising a cylinder body and a piston rod 1, wherein the cylinder body comprises a cylinder barrel 3 and a guide cylinder sleeve 2 installed on the top of the cylinder barrel 3, a base 4 is installed at the bottom of the cylinder barrel 3, the piston rod 1 is movably arranged on the guide cylinder sleeve 2 and can slide relatively along the top of the guide cylinder sleeve 2, and a guide ring 9 for guiding the piston rod 1 and a piston seal 11 for active sealing are respectively arranged at the connection position between the piston rod 1 and the guide cylinder sleeve 2, and further comprises:

[0029] Inflatable component, the base 4 is a hollow structure, the inflatable component is sealed and arranged at the bottom of the base 4, and the inflatable component is detachable;

[0030] The capillary hole 13, the bottom of the guide cylinder sleeve 2 and the top of the base 4 are sealed and fixed in the cylinder 3, the second inner cavity 19 is formed between the connection position of the guide cylinder sleeve 2 and the base 4 and the inner wall of the cylinder 3, the inner wall of the guide cylinder sleeve 2 and the bottom part of the piston rod 1 and the top hollow part of the base 4 form a first inner cavity 18, the capillary hole 13 is opened on the base 4 and is used to connect the first inner cavity 18 and the second inner cavity 19;

[0031] The first inner cavity 18 is provided with a portion of lubricating oil 12. When high-pressure nitrogen is injected into the first inner cavity 18 through the inflation assembly, the pressure between the first inner cavity 18 and the second inner cavity 19 is kept equal, and the lubricating oil 12 immerses the capillary pores 13.

[0032] When the piston rod 1 is compressed by an external force and moves downward rapidly, the space of the first inner cavity 18 becomes smaller, and the pressure in the first inner cavity 18 increases suddenly;

[0033] When the piston rod 1 rises rapidly after the external force is released, the space of the first inner cavity 18 increases, and the pressure in the first inner cavity 18 decreases suddenly:

[0034] When this embodiment is used in practice, it can be known from the Boyle gas state equation that when the piston rod 1 is forced to move downward quickly, the space in the cylinder is compressed and reduced, so that the internal pressure of the first inner cavity 18 suddenly increases. Since the lubricating oil immerses the capillary pores 13, a large amount of oil mist will be generated when the gas enters the second inner cavity 19 through the capillary pores 13. The generated oil mist adheres to the wall of the second inner cavity 19, especially the inner wall of the cylinder barrel 3 (such as Figure 2 As shown), it can play a good cooling role. On the contrary, when the external force is released and the piston rod 1 rises quickly, the space of the first inner cavity 18 increases, so that its pressure decreases rapidly, so that the high pressure in the second inner cavity 19 quickly flows into the first inner cavity 18 through the capillary pores 13, and forms a large amount of oil mist. The generated oil mist adheres to the piston seal 11 and the inner wall of the guide cylinder sleeve 2 (as shown in FIG. Figure 3 As shown in the figure), a lubrication cycle is completed to provide a good lubrication environment for the next downward movement of the piston rod 1, thereby increasing the service life of the piston seal 11 (i.e., the service life of the nitrogen spring) by reducing the friction coefficient between the piston seal 11 and the inner wall of the guide cylinder sleeve 2 during operation and reducing the internal temperature.

[0035] like Figure 1-3 As shown, as a preferred embodiment of the present invention, a sealing ring 10 is further provided at the connection position between the piston rod 1 and the guide cylinder sleeve 2 , and the sealing ring 10 is arranged at the top position of the piston seal 11 .

[0036] In actual application of this embodiment, combined with the above embodiment, the piston rod 1 penetrates the guide cylinder sleeve 2 from bottom to top, and the piston of the piston rod 1 and the inner wall of the guide cylinder sleeve 2 are provided with a guide ring 9, a sealing ring 10 and a piston seal 11 in sequence from top to bottom.

[0037] like Figure 1-3 As shown, as another preferred embodiment of the present invention, the inner wall of the guide cylinder sleeve 2 and close to the outer side are successively provided with an inner dust ring 8 and a support ring 14, and the inner dust ring 8 and the support ring 14 are respectively sleeved on the piston rod 1 and the two are arranged successively from the outside to the inside.

[0038] In actual application, this embodiment plays the role of dust prevention and supporting the piston rod 1 through the provision of the inner dust ring 8 and the support ring 14.

[0039] like Figure 1-3 As shown, as another preferred embodiment of the present invention, the guide cylinder sleeve 2 is connected to the top of the cylinder barrel 3 through a first thread pair and a static seal 5.

[0040] In actual application of this embodiment, the guide cylinder sleeve 2 is easily fixed to the top of the cylinder barrel 3 in a stable and sealed manner through the first thread pair and the static seal 1 5 .

[0041] like Figure 1-3 As shown, as another preferred embodiment of the present invention, the inflatable component includes:

[0042] An inflation check valve 15, which is installed in the hollow part of the base 4, and is used to conduct forward flow when injecting gas and to cut off reverse flow;

[0043] The sealing screw 16 is used to seal the inflation check valve 15 in the hollow structure.

[0044] This embodiment provides an operating method of an inflatable assembly, comprising the following steps:

[0045] S01, inject a certain amount of lubricating oil 12 into the first inner cavity 18;

[0046] S02, install the inflation check valve 15;

[0047] S03, charging calibrated high-pressure nitrogen through the charging check valve 15, so that the pressure between the first inner cavity 18 and the second inner cavity 19 is equal due to the connection of the capillary hole 13;

[0048] S04, install the sealing screw 16.

[0049] like Figure 1-3 As shown, as another preferred embodiment of the present invention, the base 4 is connected to the bottom of the cylinder 3 through a second thread pair and a static seal 7.

[0050] In actual application of this embodiment, the second thread pair and the static seal 3 7 facilitate the stable sealing connection of the base 4 to the bottom of the cylinder 3.

[0051] like Figure 1-3 As shown, as another preferred embodiment of the present invention, the bottom of the guide cylinder sleeve 2 and the top connection position of the base 4 are sealed and fixed by a static seal 6.

[0052] In actual application of this embodiment, a plug-in fitting structure is formed between the bottom of the guide cylinder sleeve 2 and the top of the base 4, and the static seal 6 seals the stepped position of the plug-in structure, so that the first inner cavities 18 and the first inner cavities 18 can only be connected through the capillary pores 13.

[0053] like Figure 1-3 As shown, as another preferred embodiment of the present invention, a limit ring 17 is provided on the top of the piston rod 1, and the limit ring 17 is used to prevent the piston rod 1 from falling into the guide cylinder sleeve 2 before inflation.

[0054] In actual application of this embodiment, the setting of the limit ring 17 can improve the safety and effectively prevent the piston rod 1 from falling into the guide cylinder sleeve 2 before inflation.

[0055] The above embodiment of the present invention provides a nitrogen spring with a self-lubricating function. When the piston rod 1 is forced to move downward rapidly, the space in the cylinder is compressed and reduced, so that the internal pressure of the first inner cavity 18 suddenly increases. Because the lubricating oil immerses the capillary pores 13, a large amount of oil mist will be generated when the gas enters the second inner cavity 19 through the capillary pores 13. The generated oil mist adheres to the cavity wall of the second inner cavity 19, especially the inner wall of the cylinder barrel 3, which can play a good cooling role. On the contrary, when the external force is released, the piston rod 1 rises rapidly. At this time, the space of the first inner cavity 18 increases, so that its pressure decreases rapidly, so that the high-pressure gas in the second inner cavity 19 quickly flows into the first inner cavity 18 through the capillary pores 13, and a large amount of oil mist is formed. The generated oil mist adheres to the piston seal 11 and the inner wall of the guide cylinder sleeve 2, completing a lubrication cycle, and providing a good lubrication environment for the next downward movement of the piston rod 1, thereby reducing the friction coefficient of the piston seal 11 and the inner wall of the guide cylinder sleeve 2 during operation, and reducing the internal temperature to increase the service life of the piston seal 11 (i.e., the service life of the nitrogen spring).

[0056] 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 nitrogen spring with self-lubricating function, comprising a cylinder body and a piston rod, wherein the cylinder body comprises a cylinder barrel and a guide cylinder sleeve installed on the top of the cylinder barrel, a base is installed at the bottom of the cylinder barrel, the piston rod is movably arranged on the guide cylinder sleeve and can slide relatively along the top of the guide cylinder sleeve, and a guide ring for guiding the piston rod and a piston seal for movable sealing are respectively arranged at the connection position between the piston rod and the guide cylinder sleeve, characterized in that: Also includes: Inflatable component, the base is a hollow structure, the inflatable component is sealed and arranged at the bottom of the base, and the inflatable component is detachable; The capillary hole is formed on the bottom of the guide cylinder sleeve and the top of the base and is sealed and fixed in the cylinder barrel. A second inner cavity is formed between the connecting position of the guide cylinder sleeve and the base and the inner wall of the cylinder barrel. A first inner cavity is formed between the inner wall of the guide cylinder sleeve and the bottom part of the piston rod and the top hollow part of the base. The capillary hole is formed on the base and is used to connect the first inner cavity and the second inner cavity. The first inner cavity is provided with a portion of lubricating oil. When high-pressure nitrogen is injected into the first inner cavity through the inflation component, the pressure between the first inner cavity and the second inner cavity is kept equal, and the lubricating oil immerses the capillary pores; When the piston rod is compressed by external force and moves downward rapidly, the space of the first inner cavity becomes smaller and the pressure in the first inner cavity increases suddenly; When the piston rod quickly rises after the external force is released, the space of the first inner cavity increases and the pressure in the first inner cavity decreases suddenly; A sealing ring is also provided at the connection position between the piston rod and the guide cylinder sleeve, and the sealing ring is arranged at the top position of the piston seal; An inner dust ring and a support ring are sequentially mounted on the inner wall of the guide cylinder sleeve and close to the outer side. The inner dust ring and the support ring are respectively sleeved on the piston rod and are arranged sequentially from the outside to the inside. The guide cylinder sleeve is connected to the top of the cylinder barrel through a first thread pair and a static seal 1; The inflatable component comprises: An inflation check valve, which is installed in the hollow part of the base and is used to conduct forward flow when gas is injected and to cut off reverse flow; Sealing screw, used to seal the inflation check valve in the hollow structure The base is connected to the bottom of the cylinder through a second thread pair and a static seal; The bottom of the guide cylinder sleeve and the top connection position of the base are sealed and fixed by static seal 2.

2. The nitrogen spring with self-lubricating function according to claim 1, characterized in that A limit ring is provided at the top of the piston rod, and the limit ring is used to prevent the piston rod from falling into the guide cylinder sleeve before inflation.

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