CN114427582A - Low-resistance lockable gas spring - Google Patents

Abstract

The invention relates to the technical field of gas springs, in particular to a low-resistance lockable gas spring. The utility model provides a low resistance lockable air spring, including outer tube and inner tube, the inner tube is located inside the outer tube, the one end of outer tube is provided with the back head, the one end of inner tube corresponds the back head and is provided with the uide bushing, the inside guide pin bushing that is provided with of the other end of outer tube, sliding connection has the piston rod in the guide pin bushing, sliding connection has the ejector pin in the piston rod, the one end of piston rod is located the inner tube inside and is provided with the slide, sliding connection has the needle with ejector pin matched with in the slide, be provided with the valve body piston with inner tube sliding seal connection on the tip of piston rod, the inner tube is inside and be located sliding seal between valve body piston and the uide bushing and be provided with floating piston. The invention ensures that the floating piston is less in friction force when sliding, so that the floating piston is not easy to wear, the service life of the floating piston is prolonged, the sealing performance is better, and the phenomenon of air leakage or oil leakage is not easy to occur.

Description

A low resistance lockable gas spring

technical field

The invention relates to the technical field of gas springs, in particular to a low-resistance lockable gas spring.

Background technique

Gas spring is an industrial accessory that can function as support, buffer, braking, height adjustment and angle adjustment. It consists of the following parts: pressure cylinder, piston rod, piston, sealing guide sleeve, filler, control elements in the cylinder and control elements outside the cylinder and joints, etc. The principle is to fill the closed pressure cylinder with inert liquid or oil and gas mixture, so that the pressure in the cavity is several times or tens of times higher than the atmospheric pressure, and the pressure difference generated by using the cross-sectional area of the piston rod is smaller than that of the piston. to achieve the movement of the piston rod.

The floating piston inside the existing double-cylinder gas spring is generally arranged between the outer tube and the inner tube, and the surface roughness of the outer diameter of the inner tube is relatively large, and the floating piston is subjected to a relatively large frictional force when sliding, which makes the floating piston easy to wear. , the life of the floating piston is short, and the sealing performance of the existing gas spring is poor, and the phenomenon of air leakage or oil leakage is easy to occur.

SUMMARY OF THE INVENTION

The present invention is mainly aimed at the above-mentioned problems, and provides a kind of friction force which makes the floating piston suffer less when sliding, so that the floating piston is not easy to wear, thereby improving the service life of the floating piston, and has good sealing performance, and it is not easy to cause air leakage or leakage. Low resistance to oil leakage locks the gas spring.

The purpose of the present invention is mainly achieved through the following scheme: a low-resistance lockable gas spring, comprising an outer tube and an inner tube, the inner tube is located inside the outer tube, and one end of the outer tube is provided with a rear The end of the inner tube is provided with a guide sleeve corresponding to the rear head, the other end of the outer tube is provided with a guide sleeve, and a piston rod is slidably connected in the guide sleeve, and the piston rod is An ejector rod is slidably connected inside, one end of the piston rod is located inside the inner tube and is provided with a slideway, and a valve needle matched with the ejector rod is slidably connected in the slideway, and the end of the piston rod is on the A valve body piston is provided with a sliding and sealing connection with the inner tube, a floating piston is arranged inside the inner tube and is slidably sealed between the valve body piston and the guide sleeve, and a first cavity is formed between the inner tube and the outer tube The inside of the inner tube and between the floating piston and the guide sleeve is a second cavity, and the guide sleeve is provided with a diversion channel for connecting the first cavity and the second cavity. A lower cavity is arranged inside the inner tube and located between the valve body piston and the floating piston, a spacer sleeve is arranged in the outer tube and located at the end of the inner tube away from the guide sleeve, and the inner tube is located inside the spacer sleeve and the spacer sleeve. Between the valve body and the piston is an upper cavity, the valve body piston is provided with a valve cavity, the valve body piston is provided with a flow hole for connecting the upper cavity and the valve cavity, and the valve needle The end away from the ejector rod passes through the valve cavity and extends into the lower cavity, and the end of the valve needle away from the ejector rod is provided with a baffle plate corresponding to the valve body piston. The inner tube is located inside the outer tube, one end of the outer tube is provided with a rear head, one end of the inner tube is provided with a guide sleeve corresponding to the rear head, the other end of the outer tube is internally provided with a guide sleeve, and a piston rod is slidably connected in the guide sleeve, The piston rod is slidably connected with an ejector rod. One end of the piston rod is located inside the inner tube and is provided with a slideway. The slideway is slidably connected with a valve needle matched with the ejector rod. The end of the piston rod is provided with a sliding seal with the inner tube. The connected valve body piston has a floating piston inside the inner tube and located between the valve body piston and the guide sleeve to slide and seal, between the inner tube and the outer tube is a first cavity, and the inner tube is located between the floating piston and the guide sleeve. There is a second cavity, the guide sleeve is provided with a diversion channel for connecting the first cavity and the second cavity, the first cavity and the second cavity are filled with gas, and the inner tube is located inside the valve body piston and the valve body. A lower cavity is arranged between the floating pistons, a spacer is arranged in the outer tube and located at one end of the inner tube away from the guide sleeve, and an upper cavity is arranged inside the inner tube and between the spacer and the valve body piston, and the valve body piston is provided with a spacer. There is a valve cavity, the valve cavity, the upper cavity and the lower cavity are filled with oil, the valve body piston is provided with a flow hole for connecting the upper cavity and the valve cavity, and the end of the valve needle away from the ejector rod passes through The valve cavity extends into the lower cavity, and the end of the valve needle away from the ejector rod is provided with a choke plate corresponding to the valve body piston. When the entire gas spring is not affected by external force, the choke plate will abut against the valve cavity on the valve body piston. opening, so that the oil in the lower cavity cannot enter the valve cavity; the operation of the piston rod in the entire gas spring mainly has three states, the first is the compression state, when the external force presses the ejector rod, the ejector rod moves and pushes The valve needle is opened, so that the baffle plate on the valve needle is separated from the valve body piston, so that the upper cavity, the valve cavity and the lower cavity are connected, and then the external force continues to press the piston rod. When the external force is greater than the piston rod support When the force is applied, the piston rod continues to be pressed down. Since the piston rod enters the inner tube, the oil in the lower cavity is squeezed into the valve cavity and flows into the upper cavity through the flow hole, and at the same time, the oil in the lower cavity pushes The floating piston moves down, and the gas in the first cavity and the second cavity is compressed; the second is the extended state, when the external force presses the ejector rod, the ejector rod moves and pushes the valve needle to open, making the flow resistance on the valve needle. The plate is separated from the valve body piston, so that the upper cavity, the valve cavity and the lower cavity are connected. When the external force is less than the supporting force of the piston rod, the piston rod extends outward, so that the oil in the upper cavity is squeezed Then it enters the valve cavity and flows into the lower cavity, the piston rod extends out of the inner tube, and at the same time, the gas pressure in the second cavity pushes the floating piston upward; the third is the locked state, when the external force on the ejector rod is withdrawn, Because the internal and external pressures of the valve needle are different and the external pressure is less than the internal pressure, a thrust is generated to close the valve needle, and the baffle plate on the valve needle will press against the valve body piston to separate the valve cavity and the lower cavity. At this time, the oil circuit is closed. The oil is more difficult to compress, the internal pressure remains unchanged, the piston rod can stay at any position, and the locking force of the piston rod is high and the stability is better; when the entire gas spring is running, since the floating piston is located in the inner tube, the inner The inner diameter of the tube has a lower surface roughness, and the floating piston experiences less friction when sliding, The floating piston is not easy to wear, thereby improving the service life of the floating piston, and the structure has fewer sealing points, higher sealing reliability, and less air leakage or oil leakage. The amount of oil in the pipe is less, and a larger flow hole can be designed to achieve high elastic velocity.

Preferably, an oil seal is arranged around the piston rod between the guide sleeve and the spacer. An oil seal is arranged around the piston rod between the guide sleeve and the spacer, and the oil seal can have a better sealing effect, ensure the stability during use, and improve the service life.

Preferably, a positioning sleeve is disposed on the side of the slideway away from the ejector rod corresponding to the valve needle, and a fourth sealing ring is disposed in the positioning sleeve. The side of the slideway away from the ejector rod is provided with a positioning sleeve corresponding to the valve needle, and a fourth sealing ring is arranged in the positioning sleeve. Both the positioning sleeve and the fourth sealing ring are arranged corresponding to the valve needle. It has certain guiding and positioning functions, and on the other hand, it can also play a better sealing effect to prevent oil leakage.

Preferably, the floating piston is provided with a first sealing ring corresponding to the inner tube.

Preferably, the spacer sleeve is provided with a second sealing ring corresponding to the outer pipe, and the spacer sleeve is provided with a third sealing ring corresponding to the inner pipe.

Preferably, the outer surface of the valve body piston is provided with a fifth sealing ring corresponding to the inner tube.

Therefore, a low-resistance lockable gas spring of the present invention has the following advantages: the present invention has a simple structure and is convenient to use, and can make the friction force received by the floating piston during sliding smaller, so that the floating piston is not easy to wear, thereby improving the floating The service life of the piston, and the sealing performance is good, and it is not easy to leak air or oil.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Illustration description: 1-Ejector rod, 2-Piston rod, 21-Slide way, 22-Valve needle, 221-Baffle plate, 23-Locating sleeve, 24-Fourth sealing ring, 3-Outer tube, 4-Inner Pipe, 5-rear head, 6-guide sleeve, 61-guide channel, 7-guide sleeve, 8-oil seal, 9-spacer, 91-second sealing ring, 92-third sealing ring, 10-valve Body piston, 101-fifth sealing ring, 102-flow hole, 103-upper cavity, 104-valve cavity, 11-lower cavity, 12-floating piston, 121-first sealing ring, 13-first cavity body, 14 - the second cavity.

Detailed ways

The technical solutions of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

Example 1:

As shown in Figure 1, a low-resistance lockable gas spring includes an outer tube 3 and an inner tube 4, the inner tube 4 is located inside the outer tube 3, one end of the outer tube 3 is provided with a rear head 5, and one end of the inner tube 4 Corresponding to the rear head 5, a guide sleeve 6 is provided, and the other end of the outer tube 3 is provided with a guide sleeve 7. The piston rod 2 is slidably connected in the guide sleeve 7, and the ejector rod 1 is slidably connected in the piston rod 2. One end is located inside the inner tube 4 and is provided with a slideway 21 . The slideway 21 is slidably connected with a valve needle 22 matched with the ejector rod 1 , and the end of the piston rod 2 is provided with a valve body that is slidably and sealedly connected to the inner tube 4 . Piston 10, a floating piston 12 is provided inside the inner tube 4 and located between the valve body piston 10 and the guide sleeve 6 in a sliding seal. Between the piston 12 and the guide sleeve 6 is the second cavity 14 . The guide sleeve 6 is provided with a guide channel 61 for connecting the first cavity 13 and the second cavity 14 . The first cavity 13 and the second cavity 14 is filled with gas, a lower cavity 11 is arranged inside the inner tube 4 and located between the valve body piston 10 and the floating piston 12, and a spacer 9 is arranged in the outer tube 3 and located at the end of the inner tube 4 away from the guide sleeve 6 , inside the inner tube 4 and located between the spacer 9 and the valve body piston 10 is the upper cavity 103, the valve body piston 10 is provided with a valve cavity 104, the valve cavity 104, the upper cavity 103 and the lower cavity 11 are all filled There is oil, the valve body piston 10 is provided with a flow hole 102 for connecting the upper cavity 103 and the valve cavity 104, and the end of the valve needle 22 away from the ejector rod 1 passes through the valve cavity 104 and extends into the lower cavity 11. , the end of the valve needle 22 away from the ejector rod 1 is provided with a choke plate 221 corresponding to the valve body piston 10. When the entire gas spring is not affected by external force, the choke plate 221 will abut against the opening of the valve cavity 104 on the valve body piston 10. so that the oil in the lower cavity 11 cannot enter the valve cavity 104; the operation of the piston rod 2 in the entire gas spring mainly has three states. The movement of the ejector rod 1 pushes the valve needle 22 to open, so that the baffle plate 221 on the valve needle 22 is separated from the valve body piston 10, so that the upper cavity 103, the valve cavity 104 and the lower cavity 11 are connected, and then the external force continues. Press the piston rod 2. When the external force is greater than the supporting force of the piston rod 2, the piston rod 2 continues to press down. Since the piston rod 2 enters the inner tube 4, the oil in the lower chamber 11 is squeezed and enters the valve chamber. 104 and flows into the upper cavity 103 through the flow hole 102, and at the same time, the oil in the lower cavity 11 pushes the floating piston 12 down, and the gas in the first cavity 13 and the second cavity 14 is compressed; the second is In the extended state, when the external force presses the ejector rod 1, the ejector rod 1 moves and pushes the valve needle 22 to open, so that the baffle plate 221 on the valve needle 22 is separated from the valve body piston 10, so that the upper cavity, valve cavity, The lower cavity 11 is connected. When the external force is less than the supporting force of the piston rod 2, the piston rod 2 extends outward, so that the oil in the upper cavity is squeezed into the valve cavity and flows into the lower cavity 11. 2 stretch out In the inner tube 4, at the same time, the gas pressure in the second cavity 14 pushes the floating piston 12 to move up; the third is the locked state, when the external force on the ejector rod 1 is withdrawn, the valve needle 22 is due to the different internal and external pressures and the external The pressure is lower than the internal pressure, so that a thrust is generated to close the valve needle 22, and the baffle plate 221 on the valve needle 22 will press against the valve body piston 10 to cut off the valve cavity and the lower cavity 11. At this time, the oil circuit is closed, and the oil It is difficult to compress, the internal pressure remains unchanged, the piston rod 2 can stay at any position, and the locking force of the piston rod 2 is high, and the stability is better; when the entire gas spring is running, since the floating piston 12 is located in the inner tube 4, The surface roughness of the inner diameter of the inner tube 4 is low, and the friction force received by the floating piston 12 during sliding is small, so that the floating piston 12 is not easy to wear, thereby improving the service life of the floating piston 12, and the structure has fewer sealing points. The reliable sealing life is high, and air leakage or oil leakage is not easy to occur; and in this structure, only the inner tube 4 is an oil storage cavity, and the inner tube 4 has less oil, and a larger flow hole 102 can be designed to achieve high elastic velocity.

Due to the use of the floating piston 12, the gas-liquid cavity is separated. Compared with a single cylinder, it can have a larger air cavity. Since the pressure difference between the gas-liquid cavity is small and is equal at rest, the gas spring has a longer life. At the same time, the air cavity is very large, even if the floating piston 12 is worn out and leaks a small amount of oil, it will not affect the use; the floating piston 12 has only one sealing surface, the surface accuracy of the inner diameter of the inner tube 4 is easier to improve, the surface will not be scratched, and the quality is better. Easy to guarantee; due to the large air cavity, the piston rod 2 has strong compression ability and fast rebound.

An oil seal 8 is arranged around the piston rod 2 between the guide sleeve 7 and the spacer sleeve 9. The oil seal 8 can have a better sealing effect, ensure the stability during use, and improve the service life.

The side of the slideway 21 away from the ejector rod 1 is provided with a positioning sleeve 23 corresponding to the valve needle 22, and a fourth sealing ring 24 is arranged in the positioning sleeve 23. Both the positioning sleeve 23 and the fourth sealing ring 24 are arranged corresponding to the valve needle 22. On the one hand, it can play a certain role in guiding and positioning the movement of the valve needle 22, on the other hand, it can also play a better sealing effect to prevent oil leakage.

The floating piston 12 is provided with a first sealing ring 121 corresponding to the inner pipe 4; the spacer 9 is provided with a second sealing ring 91 corresponding to the outer pipe 3, and the spacer 9 is provided with a third sealing ring 92 corresponding to the inner pipe 4 ; The outer surface of the valve body piston 10 is provided with a fifth sealing ring 101 corresponding to the inner tube 4, so that a better sealing effect can be achieved.

It should be understood that this embodiment is only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims (6)

1. A low-resistance lockable gas spring, comprising an outer tube and an inner tube, the inner tube is located inside the outer tube, it is characterized in that, one end of the outer tube is provided with a rear head, and the inner tube is One end of the tube is provided with a guide sleeve corresponding to the rear head, the other end of the outer tube is provided with a guide sleeve, a piston rod is slidably connected in the guide sleeve, and a top rod is slidably connected in the piston rod, so One end of the piston rod is located inside the inner tube and is provided with a slideway, the slideway is slidably connected with a valve needle matched with the ejector rod, and the end of the piston rod is provided with a sliding seal connection with the inner tube. The valve body piston is provided with a floating piston inside the inner tube and located between the valve body piston and the guide sleeve in a sliding seal, the first cavity is between the inner tube and the outer tube, and the inner tube is The second cavity is located between the floating piston and the guide sleeve. The guide sleeve is provided with a diversion channel for connecting the first cavity and the second cavity. The inner tube is located inside the valve body piston. A lower cavity is arranged between the floating piston and the outer tube, a spacer sleeve is arranged in the outer tube and located at the end of the inner tube away from the guide sleeve, and the upper cavity is located inside the inner tube and between the spacer sleeve and the valve body piston. The valve body piston is provided with a valve cavity, the valve body piston is provided with a flow hole for connecting the upper cavity and the valve cavity, and the end of the valve needle away from the ejector rod passes through the valve The cavity extends into the lower cavity, and the end of the valve needle away from the ejector rod is provided with a baffle plate corresponding to the valve body piston. 2 . The low-resistance lockable gas spring according to claim 1 , wherein an oil seal is arranged around the piston rod between the guide sleeve and the spacer sleeve. 3 . 3 . The low-resistance lockable gas spring according to claim 1 , wherein the side of the slideway away from the ejector rod is provided with a positioning sleeve corresponding to the valve needle, and the positioning sleeve is provided with a positioning sleeve. 4 . Fourth seal. 4 . The low-resistance lockable gas spring according to claim 1 , wherein the floating piston is provided with a first sealing ring corresponding to the inner tube. 5 . 5. A low-resistance lockable gas spring according to claim 1, 2 or 3, wherein the spacer is provided with a second sealing ring corresponding to the outer tube, and the spacer is provided with a corresponding inner ring. The tube is provided with a third sealing ring. 6 . The low-resistance lockable gas spring according to claim 1 , wherein a fifth sealing ring is provided on the outer surface of the valve body piston corresponding to the inner tube. 7 .

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