One-way valve of double follow-up sealing structure

Abstract

The utility model relates to the field of lifting devices, and discloses a one-way valve of a double follow-up sealing structure, which comprises an oil cylinder (1) and a piston rod (2), the oil cylinder (1) is divided into an upper cavity (101) and a lower cavity (102), the one-way valve further comprises a first one-way sealing assembly (3) and a sealing filter assembly (4), the sealing filter assembly (4) comprises a second one-way sealing assembly (41) and a filter screen (42), and the piston rod (2) is connected with the first one-way sealing assembly (3). The second one-way sealing assembly (41) controls oil liquid to flow into the lower cavity (102) from the upper cavity (101), and the filter screen (42) is located between the first one-way sealing assembly (3) and the second one-way sealing assembly (41). According to the non-differential follow-up type oil cylinder, the follow-up function of the non-differential follow-up type oil cylinder is achieved, and meanwhile when one check valve fails, the other check valve can guarantee the lifting function of the non-differential follow-up type oil cylinder; the one-way valve of the double follow-up sealing structure is designed in the oil cylinder, the size of the oil cylinder is not additionally increased, and whole vehicle installation is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of lifting devices, in particular to a one-way valve with a double follow-up sealing structure. Background Art

[0002] In the current commercial vehicle cab lifting system, there are many types of cylinders, such as non-differential cylinders, differential cylinders, non-differential follower cylinders, and plunger cylinders. In the non-differential follower cylinder, if you want to achieve the follow-up function, you need to install a one-way valve body in the lower support, so that when the cylinder follows up, the hydraulic oil in the upper chamber of the cylinder enters the lower chamber of the cylinder through the one-way valve steel ball in the top valve seat; when the cylinder follows down, the hydraulic oil is discharged from the oil nozzle through the top valve seat itself. When the cab is lifted, the hydraulic oil enters from the oil inlet, the one-way valve steel ball in the valve seat and the lower support are in a sealed state, and the hydraulic oil can only enter the lower chamber to achieve cab lifting.

[0003] However, in actual work, since the purity of hydraulic oil cannot be guaranteed, there are impurities in the oil circuit, and the impurities are carried to various places in the system through the operation of the hydraulic system, which can easily cause the oil cylinder to fail to lift. For example, after the impurities enter the valve seat of the one-way valve, they are stuck in the hole between the steel ball in the valve seat and the upper chamber of the oil cylinder, making the one-way valve function ineffective. When the oil cylinder moves downward, part of the hydraulic oil in the lower chamber enters the upper chamber through the unsealed one-way valve, which cannot meet the cylinder's movement requirements, and the driver will feel uncomfortable.

[0004] Therefore, it is imperative to develop a one-way valve structure with a simple structure that can effectively prevent impurities from entering the one-way valve seat and causing the cylinder to fail to work normally. Utility Model Content

[0005] The utility model aims at the shortcomings of the prior art and provides a one-way valve with a double follow-up sealing structure.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A one-way valve with a double follow-up seal structure includes an oil cylinder and a piston rod. The piston rod is installed in the oil cylinder and its inner cavity is divided into an upper cavity and a lower cavity. The upper cavity and the lower cavity are connected by a first oil circuit. The first oil circuit is provided with a first one-way seal component for controlling the oil to flow from the upper cavity to the lower cavity. The first oil circuit is also provided with a seal filter component, which includes a second one-way seal component and a filter screen. The second one-way seal component controls the oil to flow from the upper cavity to the lower cavity. The filter screen is located between the first one-way seal component and the second one-way seal component.

[0008] Preferably, a magnetic adsorption net is provided in the filter net, and the filter net is installed in the valve body by means of a buckle.

[0009] Preferably, a valve cavity is provided in the valve body, a movable valve seat is provided in the valve cavity, the movable valve seat and the inner wall of the valve cavity are sealed by a sealing ring, the movable valve seat divides the valve cavity into chamber b and chamber d, a chamber c is provided in the movable valve seat, chamber b is connected with the upper cavity, a small hole is provided on the movable valve seat and chamber b and chamber c are connected through the small hole, chamber b is connected with the upper cavity, a first one-way sealing assembly is installed in the movable valve seat and controls the on-off of chamber c and chamber d, and a sealing filter assembly is installed below the movable valve seat and controls the on-off of chamber d and the upper cavity.

[0010] Preferably, the first one-way sealing assembly includes a first steel ball and a first spring; the first steel ball is in contact with the first spring and is pressed by the elastic force of the first spring against an opening connecting the movable valve seat and the valve cavity.

[0011] Preferably, the second one-way sealing assembly includes a second steel ball and a second spring, and the second steel ball is in contact with the second spring and is pressed by the elastic force of the second spring against the opening connecting the valve cavity and the upper cavity.

[0012] Preferably, it also includes a one-way oil inlet sealing assembly, which includes an oil inlet steel ball and an oil inlet spring. The oil inlet steel ball is installed at one end of the movable valve seat, and the oil inlet spring is installed at the other end of the movable valve seat. The oil inlet steel ball is pushed and pressed against the inner wall of the valve body by the oil inlet spring. The oil inlet steel ball contacts the oil inlet spring and is pushed and pressed against the inner wall of the valve body to achieve sealing in the valve cavity. The outer end of the oil inlet steel ball (i.e., the end connected to the first oil pipe) is cavity a, and the inner end of the oil inlet steel ball (i.e., the end formed with the inner wall of the valve cavity) is cavity b. The oil inlet spring controls the on-off of cavity a and cavity b, so that during the lifting process, the oil can only flow from the first oil pipe to the lower cavity.

[0013] Preferably, it also includes a first oil pipe connected to the oil tank, the first oil pipe is connected to the lower chamber through a one-way oil inlet sealing assembly, and the one-way oil inlet sealing assembly controls the oil to flow from the lower chamber into chamber a and the oil tank only.

[0014] Preferably, it also includes a second oil pipe connected to the oil tank, the second oil pipe is connected to the upper chamber, a valve core is provided in the second oil pipe, the valve core is sealed with the inner wall of the second oil pipe and can move in the second oil pipe and divide the second oil pipe into an f chamber connected to the oil tank and the upper chamber, a push rod is provided on the valve core, the push rod contacts the oil inlet steel ball and pushes the oil inlet steel ball to counteract the force of the oil inlet spring, thereby opening the one-way oil inlet sealing assembly.

[0015] Preferably, an O-ring sealingly matched with the inner wall of the second oil pipe is provided on the valve core.

[0016] The utility model has significant technical effects due to the adoption of the above technical scheme: while the utility model satisfies the follow-up function of the non-differential follow-up oil cylinder, when one of the one-way valves fails, the other one-way valve can ensure the lifting function of the non-differential follow-up oil cylinder; the one-way valve of the double follow-up sealing structure is designed in the oil cylinder, without increasing the volume of the oil cylinder, which is convenient for installation on the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 yes Figure 1 A partial enlarged view of .

[0019] Figure 3 It is a hydraulic principle diagram of the utility model.

[0020] Figure 4 It is a schematic diagram of the oil circuit of the utility model when the oil cylinder is lifted.

[0021] Figure 5 It is a schematic diagram of the oil circuit when the oil cylinder of the utility model descends.

[0022] Figure 6 It is a schematic diagram of the oil circuit when the oil cylinder of the utility model follows the movement.

[0023] Figure 7 It is a schematic diagram of the oil circuit when the oil cylinder of the utility model follows the movement downward.

[0024] The names of the parts indicated by the numerical labels in the accompanying drawings are as follows: 1-cylinder, 2-piston rod, 3-first one-way sealing assembly, 4-sealing filter assembly, 5-one-way oil inlet sealing assembly, 6-first oil pipe, 7-second oil pipe, 8-movable valve seat, 101-upper chamber, 102-lower chamber, 11-, 31-first steel ball, 32-first spring, 41-second one-way sealing assembly, 411-second steel ball, 412-second spring, 42-filter, 51-oil inlet steel ball, 52-oil inlet spring, 71-valve core, 72-push rod, 73-O-ring. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] Example 1

[0027] A one-way valve with a double follow-up seal structure includes an oil cylinder 1 and a piston rod 2. The piston rod 2 is installed in the oil cylinder 1 and its inner cavity is divided into an upper cavity 101 and a lower cavity 102. The upper cavity 101 and the lower cavity 102 are connected by a first oil circuit. The first oil circuit is provided with a first one-way seal component 3 for controlling the oil to flow from the upper cavity 101 to the lower cavity 102. The first oil circuit is also provided with a seal filter component 4. The seal filter component 4 includes a second one-way seal component 41 and a filter screen 42. The second one-way seal component 41 controls the oil to flow from the upper cavity 101 to the lower cavity 102. The filter screen 42 is located between the first one-way seal component 3 and the second one-way seal component 41.

[0028] A magnetic adsorption net is provided on the filter net 42, and the filter net 42 is installed in the valve body through a buckle. The magnetic adsorption material can adsorb metal substances in the oil, and the buckle arrangement can also facilitate installation and replacement.

[0029] Example 2

[0030] The same as Example 1, except that a valve cavity is provided in the valve body, a movable valve seat 8 is provided in the valve cavity, the movable valve seat 8 is sealed with the inner wall of the valve cavity by a sealing ring, the movable valve seat 8 divides the valve cavity into a b cavity and a d cavity, a c cavity is provided in the movable valve seat 8, the b cavity is connected with the upper cavity 101, a small hole is provided on the movable valve seat 8 and the b cavity and the c cavity are connected through the small hole, the b cavity and the upper cavity 101 are connected, the first one-way sealing component 3 is installed in the movable valve seat 8 and controls the opening and closing of the c cavity and the d cavity, and the sealing filter component 4 is installed below the movable valve seat 8 and controls the opening and closing of the d cavity and the upper cavity 101.

[0031] The first one-way sealing assembly 3 includes a first steel ball 31 and a first spring 32 ; the first steel ball 31 is in contact with the first spring 32 and is pressed by the elastic force of the first spring 32 to the opening where the movable valve seat 8 communicates with the valve cavity.

[0032] The second one-way sealing assembly 41 includes a second steel ball 411 and a second spring 412 . The second steel ball 411 contacts the second spring 412 and is pressed by the elastic force of the second spring 412 at the opening where the valve cavity communicates with the upper cavity 101 .

[0033] It also includes a one-way oil inlet sealing assembly 5, which includes an oil inlet steel ball 51 and an oil inlet spring 52. The oil inlet steel ball 51 is installed at one end of the movable valve seat 8, and the oil inlet spring 52 is installed at the other end of the movable valve seat 8. The oil inlet steel ball 51 is pushed and pressed against the inner wall of the valve body by the oil inlet spring 52. The oil inlet steel ball 51 contacts the oil inlet spring 52 and is pushed and pressed against the inner wall of the valve body to achieve sealing in the valve cavity. The outer end of the oil inlet steel ball 51, i.e., the end connected to the first oil pipe 6, is cavity a, and the inner end of the oil inlet steel ball 51, i.e., the end formed with the inner wall of the valve cavity, is cavity b. The oil inlet spring 52 controls the on-off of cavity a and cavity b, so that during the lifting process, the oil can only flow from the first oil pipe 6 to the lower cavity 102.

[0034] It also includes a first oil pipe 6 connected to the oil tank. The first oil pipe 6 is connected to the lower chamber 102 through a one-way oil inlet sealing assembly 5. The one-way oil inlet sealing assembly 5 controls the oil to flow from the lower chamber 102 into the chamber B and the oil tank.

[0035] It also includes a second oil pipe 7 connected to the oil tank, the second oil pipe 7 is connected to the upper chamber 101, a valve core 71 is provided in the second oil pipe 7, the valve core 71 is sealed with the inner wall of the second oil pipe 7 and can move in the second oil pipe 7 and divide the second oil pipe 7 into an f chamber connected to the oil tank and the upper chamber 101, a push rod 72 is provided on the valve core 71, the push rod 72 contacts the oil inlet steel ball 51 and pushes the oil inlet steel ball 51 to counteract the force of the oil inlet spring 53, thereby opening the one-way oil inlet sealing assembly 5.

[0036] An O-ring 73 is provided on the valve core 71 and is in sealing cooperation with the inner wall of the second oil pipe 7 .

[0037] When the oil cylinder 1 is performing cab lifting work, the hydraulic oil is filtered from the first oil pipe 6 through the filter screen 42, and then enters the a chamber in the oil cylinder support through the through hole in the joint. Because the pressure in the a chamber increases, the hydraulic oil generates a greater force than the oil inlet spring 52, pushing the oil inlet steel ball 51 and the first one-way sealing component 3 open, allowing the hydraulic oil to enter the b chamber and the lower chamber 102 of the oil cylinder. Because there is a small hole on the movable valve seat 8, the lower chamber 102 of the oil cylinder is connected to the c chamber in the movable valve seat 8, and the hydraulic oil will enter the c chamber. At this time, the first spring 32 pushes the first steel ball 31 against the movable valve seat 8, so that the first spring 32 forms a one-way valve structure with the first steel ball 31, so that the c chamber and the d chamber are separated by the one-way valve structure and the sealing ring on the movable valve seat 8, and the hydraulic oil will continue to enter the lower chamber 102 of the oil cylinder to complete the oil cylinder lifting work. When the oil cylinder 1 performs upward following movement, the piston 2 inside the oil cylinder 1 moves upward, and the space in the upper chamber 101 of the oil cylinder is compressed. The hydraulic oil can only flow into the lower chamber 102 of the oil cylinder by pushing away the second steel ball 421 and the first steel ball 31, thereby completing the upward following movement.

[0038] If impurities enter the c chamber, the first steel ball 32 cannot be effectively sealed with the movable valve seat 8, and the hydraulic oil and some impurities will flow into the d chamber. After the hydraulic oil is filtered by the filter 42, the impurities are blocked in the d chamber. In addition, because the second spring 422 pushes the second steel ball 421 against the screw plug 4, the second steel ball 421 forms a seal with the screw plug, and the hydraulic oil in the lower chamber 102, the c chamber and the d chamber of the oil cylinder is separated from the hydraulic oil in the upper chamber 101 of the oil cylinder, and the hydraulic oil enters the lower chamber 102 of the oil cylinder to complete the lifting work. If there is no sealing filter assembly 4, when there are impurities in the oil circuit, the lower chamber 102, the c chamber, the d chamber and the upper chamber 101 of the oil cylinder will be connected, and the hydraulic oil will directly flow into the upper chamber 101 of the oil cylinder, and flow out from the second oil pipe 7 back to the oil tank, and the cab will not be able to lift.

[0039] When the oil cylinder 1 is lowering the cab, the hydraulic oil enters the f chamber and the upper chamber 101 of the oil cylinder from the second oil pipe 7. The f chamber is separated from the a chamber by the valve core 71 and the O-ring 72. At this time, as the pressure in the upper chamber 101 of the oil cylinder gradually increases, the valve core 71 is pushed, so that its push rod pushes the oil inlet steel ball 51, and the oil in the lower chamber 102 of the oil cylinder flows into the a chamber, and then flows out from the first oil pipe 6 back to the oil tank. When the oil cylinder is moving downward, due to the one-way sealing effect of the second steel ball 421 and the first steel ball 31, the hydraulic oil cannot enter the upper chamber 101 of the oil cylinder through the two one-way valves.

[0040] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A one-way valve with a double follow-up seal structure, comprising an oil cylinder (1) and a piston rod (2), characterized in that: The piston rod (2) is installed in the oil cylinder (1) and its inner cavity is divided into an upper cavity (101) and a lower cavity (102). The upper cavity (101) and the lower cavity (102) are connected via a first oil circuit. The first oil circuit is provided with a first one-way sealing component (3) for controlling the oil to flow from the upper cavity (101) into the lower cavity (102). The first oil circuit is also provided with a sealing filter component (4). The sealing filter component (4) includes a second one-way sealing component (41) and a filter screen (42). The second one-way sealing component (41) controls the oil to flow from the upper cavity (101) into the lower cavity (102). The filter screen (42) is located between the first one-way sealing component (3) and the second one-way sealing component (41).

2. A one-way valve with a double follow-up seal structure according to claim 1, characterized in that: A magnetic adsorption net is provided on the filter net (42), and the filter net (42) is installed in the valve body by means of a buckle.

3. A one-way valve with a double follow-up seal structure according to claim 1, characterized in that: A valve cavity is provided in the valve body, a movable valve seat (8) is provided in the valve cavity, the movable valve seat (8) is sealed with the inner wall of the valve cavity via a sealing ring, a first one-way sealing component (3) is installed in the movable valve seat (8), and a sealing filter component (4) is installed below the movable valve seat (8).

4. A one-way valve with a double follow-up seal structure according to claim 3, characterized in that: The first one-way sealing component (3) comprises a first steel ball (31) and a first spring (32); the first steel ball (31) contacts the first spring (32) and is pressed by the elastic force of the first spring (32) against an opening at which the movable valve seat (8) communicates with the valve cavity.

5. A one-way valve with a double follow-up seal structure according to claim 1, characterized in that: The second one-way sealing assembly (41) comprises a second steel ball (411) and a second spring (412). The second steel ball (411) contacts the second spring (412) and is pressed by the elastic force of the second spring (412) against the opening connecting the valve cavity and the upper cavity (101).

6. A one-way valve with a double follow-up seal structure according to claim 3, characterized in that: The valve also includes a one-way oil inlet sealing assembly (5), which includes an oil inlet steel ball (51) and an oil inlet spring (52). The oil inlet steel ball (51) is mounted on one end of the movable valve seat (8), and the oil inlet spring (52) is mounted on the other end of the movable valve seat (8). The oil inlet steel ball (51) is pushed by the oil inlet spring (52) to be pressed against the inner wall of the valve body.

7. A one-way valve with a double follow-up seal structure according to claim 6, characterized in that: It also includes a first oil pipe (6) connected to the oil tank, and the first oil pipe (6) is connected to the lower chamber (102) via a one-way oil inlet sealing assembly (5).

8. A one-way valve with a double follow-up seal structure according to claim 6, characterized in that: The invention also comprises a second oil pipe (7) connected to the oil tank, the second oil pipe (7) being in communication with the upper chamber (101), a valve core (71) being provided in the second oil pipe (7), the valve core (71) being in sealing cooperation with the inner wall of the second oil pipe (7) and being movable in the second oil pipe (7), a push rod (72) being provided on the valve core (71), the push rod (72) being in contact with the oil inlet steel ball (51) and pushing the oil inlet steel ball (51) to open the one-way oil inlet sealing assembly (5).

9. A one-way valve with a double follow-up seal structure according to claim 8, characterized in that: An O-type sealing ring (73) is provided on the valve core (71) and is in sealing cooperation with the inner wall of the second oil pipe (7).

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