Glue valve structure for quantitative cylinder

Abstract

The utility model relates to the technical field of valves, in particular to a rubber valve structure for a quantitative cylinder, which comprises a driving component and an operating cylinder, the driving component comprises a driving cylinder, a piston rod and a piston fixed on the piston rod, the piston rod is provided with a shaft shoulder, the piston rod is in threaded connection with a locking nut, and the locking nut abuts against the piston on the shaft shoulder; the piston rod is sleeved with an elastic piece, and the elastic piece and the operation cylinder are located on the two axial sides of the piston. The piston comprises an upper piston and a lower piston which are both fixed on the piston rod, one axial side of each of the upper piston and the lower piston abuts against the shaft shoulder, and the other axial side of each of the upper piston and the lower piston abuts against the locking nut. The scheme is used for solving the problem that a piston fixing structure on a piston rod in the prior art is insufficient in bearing capacity under high flow speed.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a rubber valve structure for a metering cylinder. Background Technique

[0002] The rubber valve structure for a metering cylinder, such as a shut-off valve, usually consists of a driving component and a working cylinder. The driving component includes a power source, a cylinder, a piston and a piston rod, wherein the piston is slidably connected in the cylinder, and the movement of the piston drives the movement of the piston rod. The working cylinder is provided with a rubber material accommodating cavity, a feeding channel and a discharging channel. Both the feeding channel and the discharging channel are communicated with the rubber material accommodating cavity. An annular valve seat is installed on the discharging channel. One end of the piston rod far away from the piston is fixedly connected with a valve core, and the valve core is inserted into the rubber material accommodating cavity of the working cylinder. The movement of the piston rod drives the valve core to block or open the valve seat, so that when the valve seat is blocked, the communication between the inlet and outlet channels of the valve body is interrupted, and when the valve core is far away from the valve seat, the inlet and outlet channels are communicated.

[0003] In the rubber valve structure for a metering cylinder, each time the valve core moves from a static state, it needs to overcome a certain pressure. The greater the flow rate of the rubber valve per unit time and the greater the flow velocity, the greater the difficulty of moving the piston rod and the greater the force on the piston. In the prior art, the piston on the piston rod is usually fixed by an elastic retaining ring. In the case of a large flow velocity, if the structure fixed by the elastic retaining ring is still adopted, the force-bearing capacity of the retaining ring is insufficient, which easily leads to fixing failure. Content of the Utility Model

[0004] The utility model aims to provide a rubber valve structure for a metering cylinder to solve the problem of insufficient bearing capacity of the piston fixing structure on the piston rod in the prior art under a large flow velocity.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A rubber valve structure for a metering cylinder includes a driving component and a working cylinder. The driving component includes a driving cylinder, a piston rod and a piston fixed on the piston rod. The piston is slidably connected in the driving cylinder. A shoulder is provided on the piston rod, and a locking nut is threadedly connected to the piston rod. The locking nut presses the piston against the shoulder.

[0007] The principle and advantages of this scheme are as follows: By setting a shoulder on the piston rod and using a locking nut to lock the piston on the shoulder, compared with the prior art using an elastic retaining ring, the bearing force of the piston is greatly improved, the service life of the rubber valve structure is effectively prolonged, and the failure rate is reduced.

[0008] Preferably, as an improvement, an elastic member is sleeved on the piston rod. The elastic member and the working cylinder are located on the two axial sides of the piston, so as to ensure that when the piston rod moves away from the working cylinder, the elastic member buffers the whole formed by the piston rod and the piston to avoid hard impact.

[0009] Preferably, as an improvement, the piston includes an upper piston and a lower piston both fixed on the piston rod. The axial one side of both the upper piston and the lower piston abuts against the shoulder, and the axial other side abuts against the lock nut, so as to further improve the load-bearing force of the driving assembly through the upper and lower double pistons.

[0010] Preferably, as an improvement, the inner diameters of the upper piston and the lower piston are different, the piston rod is a stepped rod, the piston rod has a structure with a larger middle part and smaller two ends, and the upper piston and the lower piston are located on the same side of the middle part of the piston rod, so as to facilitate the installation of the upper piston and the lower piston from the same side of the piston rod and ensure the simplicity and feasibility of the installation.

[0011] Preferably, as an improvement, a sealing assembly for sealing the piston rod is provided between the driving cylinder and the working cylinder. The sealing assembly includes a sealing sleeve and a sealing ring installed in the sealing sleeve. The piston rod is slidably connected with the sealing ring, and the piston rod has a clearance fit with the sealing sleeve. A plurality of lubricating channels evenly distributed along the circumferential direction of the piston rod are provided on the sealing sleeve, and one ends of all the lubricating channels are all directly opposite to the outer circumference of the piston rod, so as to facilitate the realization of the uniform lubrication of the circumferential direction of the piston rod by the way of flowing lubricating oil into the circumferential lubricating channels.

[0012] Preferably, as an improvement, an outer ring groove is further provided on the sealing sleeve. The outer ring groove surrounds all the lubricating channels and is communicated with all the lubricating channels, so that only by supplying lubricating oil to the outer ring groove can it be ensured that all the lubricating channels can be lubricated.

[0013] Preferably, as an improvement, the number of the sealing rings is two. The two sealing rings are both installed in respective independent spaces. The two sealing rings are distributed along the axial direction of the piston rod, and the lubricating channels are located between the two sealing rings, so as to facilitate the lubricating oil to be carried to between the two sealing rings and the piston rod during the axial movement of the piston rod along with the piston rod, thereby helping to improve the lubrication effect and reduce the wear of the sealing rings.

[0014] Preferably, as an improvement, the sealing sleeve includes a cushion block and a U-shaped sleeve. Annular installation grooves for installing the sealing rings are provided on both the cushion block and the U-shaped sleeve. A stepped groove is formed between the driving cylinder and the working cylinder. The outer diameter of the U-shaped sleeve is smaller than the outer diameter of the cushion block. The cushion block presses the U-shaped sleeve against the small-sized step of the stepped groove. This solution makes the disassembly of the sealing assembly simple and ensures that each sealing ring has a corresponding independent annular installation groove.

[0015] Preferably, as an improvement, the cushion block is clamped between the driving cylinder and the working cylinder.

[0016] Preferably, as an improvement, one end of the piston rod inserted into the working cylinder is detachably connected with a valve core. Description of the Drawings

[0017] Figure 1 This is a three-dimensional structure schematic diagram of an embodiment of the present utility model.

[0018] Figure 2 It is Figure 1 the front view of

[0019] Figure 3 It is Figure 2 the A-A cross-sectional view in

[0020] Figure 4 It is Figure 2 the B-B cross-sectional view in Specific embodiments

[0021] The following is a further detailed description through specific embodiments:

[0022] The reference numerals in the attached drawings of the specification include: working cylinder 1, feeding channel 10, valve core 11, valve seat 12, oil injection pipe 13, driving cylinder 2, upper cylinder 201, lower cylinder 202, piston rod 21, upper piston 22, lower piston 23, locking nut 24, elastic member 25, sealing sleeve 3, cushion block 31, U-shaped sleeve 32, lubrication channel 321, outer ring groove 322, sealing ring 4.

[0023] Embodiment

[0024] Combined with Figures 1 to 4 , a rubber valve structure for a metering cylinder includes a driving assembly and a working cylinder 1. The driving assembly includes a driving cylinder 2, a piston rod 21, and a piston fixed on the piston rod 21. In this embodiment, the driving cylinder 2 is a pneumatic cylinder, and the pneumatic cylinder includes a fixedly connected upper cylinder 201 and lower cylinder 202, and the lower cylinder 202 is fixedly connected to the working cylinder 1. The piston rod 21 has a structure that is large in the middle and small at both ends, and the piston rod 21 is a stepped rod, and the step forms an axial shoulder.

[0025] The piston includes an upper piston 22 and a lower piston 23 both fixed on the piston rod 21. The upper piston 22 and the lower piston 23 both abut against the axial shoulder on one side axially and abut against the locking nut 24 on the other side axially. The locking nuts 24 are both threadedly connected to the piston rod 21 to improve the load-bearing force of the driving assembly through the upper and lower pistons. In this embodiment, the lower end surface of the piston abuts against the axial shoulder, and the upper end surface of the piston abuts against the locking nut 24.

[0026] The upper piston 22 and the lower piston 23 are both in clearance fit with the piston rod 21, and an O-ring seal is provided on the end surface where the inner hole of the piston is in contact with the outer circumference of the piston rod 21. The upper piston 22 and the lower piston 23 are located on the same side of the middle of the piston rod 21 to facilitate the installation of the upper piston 22 and the lower piston 23 from the same side of the piston rod 21 and ensure the simplicity and feasibility of the installation.

[0027] The lower piston 23 is slidably connected within the lower cylinder 202, and the upper piston 22 is slidably connected within the upper cylinder 201. The upper cylinder 201 of the drive cylinder 2 is connected to a gas source to achieve the axial movement of the upper piston 22 by controlling the intake and exhaust of the upper cylinder 201, and then drive the axial movement of the piston rod 21.

[0028] To prevent the piston cylinder from retracting too far when closing the glue valve structure, which may cause the upper piston 22 to impact the cylinder, an elastic member 25 is provided within the lower cylinder 202. The elastic member 25 is a spring and is sleeved on the piston rod 21, and the bottom of the elastic member 25 can abut against the top of the lower piston 23.

[0029] The working cylinder 1 is provided with a rubber material accommodating cavity, a feeding channel 10 and a discharging channel. Both the feeding channel 10 and the discharging channel are communicated with the rubber material accommodating cavity. An annular valve seat 12 is installed on the discharging channel. One end of the piston rod 21 away from the upper cylinder 201 penetrates through the drive cylinder 2 and is inserted into the working cylinder 1, and the end of the piston rod 21 inserted into the working cylinder 1 is detachably connected to the valve core 11 (threaded connection in this embodiment). The valve core 11 is located within the rubber material accommodating cavity, and the movement of the piston rod 21 drives the valve core 11 to block or open the valve seat 12.

[0030] A sealing assembly for sealing the piston rod 21 is provided between the lower cylinder 202 and the working cylinder 1 to prevent the rubber material from leaking along the piston rod 21.

[0031] The detailed structure of the sealing assembly includes a sealing sleeve 3 and two sealing rings 4. The sealing sleeve 3 has a clearance fit with the piston rod 21, and the piston rod 21 is slidably connected to the sealing rings 4. In this embodiment, the sealing rings 4 are made of PTFE seals. The sealing sleeve 3 includes a spacer block 31 and a U-shaped sleeve 32. Both the spacer block 31 and the U-shaped sleeve 32 are machined with annular mounting grooves for installing the sealing rings 4. The two sealing rings 4 are respectively installed in the annular mounting grooves on the spacer block 31 and the U-shaped sleeve 32, and the two sealing rings 4 are axially distributed along the piston rod 21.

[0032] The top of the working cylinder 1 facing the drive cylinder 2 is machined with a stepped groove. The outer diameter of the U-shaped sleeve 32 is smaller than the outer diameter of the spacer block 31. The spacer block 31 presses the U-shaped sleeve 32 against the small-sized step of the stepped groove, and the spacer block 31 is clamped between the drive cylinder 2 and the working cylinder 1.

[0033] Multiple radial lubrication channels 321 are provided on the U-shaped sleeve 32. All the lubrication channels 321 are evenly distributed circumferentially along the piston rod 21. An outer ring groove 322 is machined on the outer periphery of the U-shaped sleeve 32. The outer ring groove 322 surrounds all the lubrication channels 321 and is communicated with all the lubrication channels 321, so that only by supplying lubricating oil to the outer ring groove 322 can it be ensured that all the lubrication channels 321 can be lubricated. An oil injection pipe 13 is provided on the working cylinder, and the oil injection pipe 13 is communicated with the outer ring groove 322.

[0034] In this embodiment, a shoulder is provided on the piston rod 21, and the upper piston 22 and the lower piston 23 are locked on the shoulder by a lock nut 24. Compared with the prior art using an elastic retaining ring, the load-bearing capacity of the piston is greatly improved, the structural stability is enhanced, the service life of the glue valve structure is effectively extended, and the failure rate is reduced.

[0035] In addition, the stepped setting of the piston rod 21 and the structure with a large middle and small ends at both ends simplify the maintenance process. The design of the lubrication channel 321 helps to improve the effect of circumferential uniform lubrication on the basis of considering the convenience of disassembly and assembly of the sealing component.

[0036] The above are only embodiments of the present invention. Well-known specific technical solutions and / or common knowledge such as characteristics are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A rubber valve structure for a metering cylinder, comprising a driving assembly and an operating cylinder, wherein the driving assembly comprises a driving cylinder, a piston rod and a piston fixed on the piston rod, characterized in that: A shaft shoulder is arranged on the piston rod, and a locking nut is threadedly connected to the piston rod, and the locking nut presses the piston against the shaft shoulder.

2. The glue valve structure for a metering cylinder according to claim 1, characterized in that: An elastic piece is sleeved on the piston rod, and the elastic piece and the working cylinder are located on both axial sides of the piston.

3. The glue valve structure for a metering cylinder according to claim 1, characterized in that: The piston comprises an upper piston and a lower piston both fixed on the piston rod. The upper piston and the lower piston are both against the shaft shoulder on one axial side and against the locking nut on the other axial side.

4. The glue valve structure for a metering cylinder according to claim 3, characterized in that: The inner diameters of the upper piston and the lower piston are different. The piston rod is a stepped rod with a structure that the piston rod is large in the middle and small at both ends. The upper piston and the lower piston are located on the same side of the middle of the piston rod.

5. A glue valve structure for a metering cylinder according to any one of claims 1 to 4, characterized in that: A sealing assembly for sealing the piston rod is provided between the driving cylinder and the working cylinder. The sealing assembly includes a sealing sleeve and a sealing ring installed in the sealing sleeve. The piston rod is slidably connected to the sealing ring. The piston rod and the sealing sleeve are clearance-matched. The sealing sleeve is provided with a plurality of lubrication channels evenly distributed along the circumference of the piston rod. One end of all the lubrication channels faces the outer circumference of the piston rod.

6. The glue valve structure for a metering cylinder according to claim 5, characterized in that: The sealing sleeve is also provided with an outer ring groove, which surrounds all lubrication channels and is connected with all lubrication channels, so that all lubrication channels can be lubricated only by supplying lubricating oil to the outer ring groove.

7. The glue valve structure for a metering cylinder according to claim 5, characterized in that: There are two sealing rings, which are installed in separate spaces respectively. The two sealing rings are distributed along the axial direction of the piston rod, and the lubrication channel is located between the two sealing rings.

8. The glue valve structure for a metering cylinder according to claim 7, characterized in that: The sealing sleeve includes a gasket and a U-shaped sleeve. Both the gasket and the U-shaped sleeve are provided with an annular mounting groove for installing a sealing ring. A step groove is formed between the driving cylinder and the working cylinder. The outer diameter of the U-shaped sleeve is smaller than the outer diameter of the gasket. The gasket presses the U-shaped sleeve against the small-sized step of the step groove.

9. The glue valve structure for a metering cylinder according to claim 8, characterized in that: The spacer is clamped between the drive cylinder and the working cylinder.

10. A glue valve structure for a metering cylinder according to any one of claims 1-4, 6-9, characterized in that: One end of the piston rod inserted into the working cylinder is detachably connected to the valve core.

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