CN106369200B - A kind of gas spring overflow valve - Google Patents

Abstract

The invention discloses a gas spring overflow valve, which comprises a limit nut, a piston push rod, a piston, a spring, a valve core, a valve sleeve, a valve seat, a valve body, a piston cylinder and the like. In the present invention, the upper and lower ends of the gas spring are provided with two pistons with relatively different diameters, and the large piston at the upper end is used to quickly build up the internal pressure of the gas spring; the small piston at the lower end is connected to the overflow valve spool, It is used to output thrust to the overflow valve spool; the diameter of the small piston is very small, so the internal volume change of the gas spring caused by the opening process of the spool is very small, and the internal pressure of the gas spring can be basically kept constant, that is, during the opening process of the spool , The thrust of the gas spring on the spool can always be kept constant. The gas spring overflow valve uses ingenious structural design to effectively solve the problem of large pressure regulation deviation of the traditional indirect detection overflow valve.

Description

A gas spring relief valve

technical field

The invention relates to a gas spring overflow valve, which belongs to the field of electro-hydraulic control.

Background technique

The traditional direct-acting relief valve relies on setting the pre-compression of the pressure regulating spring to set the working pressure of the relief valve. As the overflow flow increases, the opening of the relief valve gradually increases, that is, the overflow The displacement of the valve spool gradually increases, the pressure regulating spring is further compressed, and the spring force acting on the spool increases, so the inlet pressure of the relief valve increases with the increase of the overflow flow, which makes the relief valve appear relatively large. A large pressure regulation deviation will have an adverse effect on the performance of the relief valve. Compared with the direct-acting relief valve, the pressure regulation deviation of the traditional indirect detection pilot relief valve is small, generally around 15%, but still maintains a large deviation.

In the process of setting the overflow pressure of the traditional overflow valve, the hydraulic system needs to be turned on to monitor the overflow setting pressure in real time. During the pressure setting process of the relief valve, the hydraulic system often works under high pressure and large flow conditions, which not only affects the service life of the hydraulic system, but also causes waste of energy.

In view of this, the inventor has carried out in-depth research on the above-mentioned problem, and then has this case to produce.

Contents of the invention

The object of the present invention is to provide a gas spring relief valve capable of reducing pressure regulation deviation.

In order to achieve the above object, the present invention adopts such technical scheme:

A gas spring overflow valve, comprising a valve seat, a valve chamber arranged in the valve seat, a valve sleeve arranged in the valve chamber, a valve core slidably arranged in the valve sleeve, and an elastic spring against the valve core The top pressure mechanism is provided with an oil inlet and an oil outlet connected to the valve cavity on the valve seat. The elastic top pressure mechanism includes a cylinder body, a first valve body, a second valve body, and a first piston arranged in the cylinder body. , the elastic member arranged between the first piston and the second valve body, the first piston push rod arranged on the first valve body, the chute opened on the second valve body, the second valve fitted in the chute The piston and the second piston push rod arranged in the chute, one end of the chute communicates with the inner cavity of the corresponding elastic member of the cylinder body, the other end of the chute communicates with the valve cavity, and one end of the second piston push rod is arranged in the chute Inside, the other end is against the valve core, the second piston push rod is arranged on the second valve body in a manner that can move axially along the cylinder body, and the two ends of the valve core along the axial direction are respectively set as the first end and the second end. Two ends, the first end is set corresponding to the second piston push rod, the second end is set corresponding to the oil inlet, and the valve cavity is respectively provided with a first chamber and a second chamber corresponding to the first end and the second end, It also includes a first oil passage, one end of the first oil passage communicates with the first chamber, the other end of the first oil passage communicates with the second chamber, and the area of the circumferential section of the spool at the first end is smaller than that at the first end. The circumferential cross-sectional area of the second end, the circumferential cross-sectional area of the chute is smaller than the circumferential cross-sectional area of the cylinder cavity.

As a preferred form of the present invention, the first valve body is provided with a first shaft hole and a bolt hole connected to each other, an adjusting bolt is arranged in the bolt hole, and a limit nut is sleeved on the adjusting bolt. A piston push rod is inserted in the first shaft hole in a manner that can move axially along the first shaft hole, one end of the first piston push rod is against the first piston, and the other end is against the adjustment bolt on.

As a preferred mode of the present invention, the first valve body is provided with a first vent hole, one end of the first vent hole communicates with the cylinder body, and the other end communicates with the outside air.

As a preferred mode of the present invention, the elastic member is a spring.

As a preferred mode of the present invention, the first valve body is threadedly connected to one end of the cylinder body, the second valve body is threaded to the other end of the cylinder body, and the second valve body is connected by bolts connected to the valve seat.

As a preferred mode of the present invention, the circumferential cross-sectional area of the inner chamber corresponding to the elastic member of the cylinder body is much larger than the circumferential cross-sectional area of the slide groove.

As a preferred mode of the present invention, a sealing ring is provided between the first piston and the inner wall of the cylinder, a sealing ring is provided between the second piston and the inner wall of the chute, and the valve A sealing ring is provided between the sleeve and the side wall of the valve cavity, and an annular boss is provided at the second end of the valve core.

As a preferred mode of the present invention, the second piston divides the chute into an upper chamber and a lower chamber, and also includes a second oil passage, one end of the second oil passage communicates with the oil outlet, The other end communicates with the lower chamber.

As a preferred mode of the present invention, the side wall of the valve core is provided with a pressure equalizing groove.

As a preferred form of the present invention, the side wall of the cylinder body is provided with an air-inflated pressure-gauge port, which penetrates from the inner wall of the cylinder body to the outer wall, and the air-inflated pressure-gauge port is arranged between the first piston and the outer wall. Between the second valve body.

After adopting the technical solution of the present invention, through the setting of the relative sizes of the first piston and the second piston, when the valve port of the overflow valve is opened, the volume change generated by the opening of the valve core has a relatively small influence on the pressure change of the inner cavity of the cylinder body where the elastic member is arranged. Small, eliminating the pressure regulation deviation of the relief valve.

In the present invention, an inflation pressure measuring port is further provided on the cylinder, which can measure the pressure of the inner cavity of the elastic member in the cylinder in real time, so the present invention can know the setting of the overflow valve without opening the oil source system pressure.

Description of drawings

Accompanying drawing 1 is the sectional schematic view of the present invention;

Accompanying drawing 2 is the schematic diagram of spool and valve sleeve of the present invention;

Explanation of the accompanying drawings:

1. Limit nut 2. First piston push rod

3. First piston 4. Spring

5. The second piston 5.1. The installation groove of the second piston gas sealing ring

6. The second piston push rod 6.1. The circular end of the second piston push rod

7. Spool 7.1. Ring flange

7.2. Pressure equalizing groove 8. Valve sleeve

8.1. Oil outlet 8.2. Oil inlet

8.3. Seal ring installation groove 9. Valve seat

9.3. Valve chamber 9.31. First chamber

9.32, the second chamber 10, the second valve body

10.1. The first chamber 10.2 The first oil circuit

10.3, the second oil passage 10.4, the second chamber

10.5, chute 11, cylinder body

11.1. Inflatable pressure measuring port 11.2. The inner cavity of the cylinder corresponding to the elastic part

12. The first valve body 12.1. The first vent hole

13. Adjusting bolt

Detailed ways

In order to further explain the technical solution of the present invention, it will be described in detail below in conjunction with the accompanying drawings.

Referring to Figures 1 and 2, a gas spring relief valve includes a valve seat 9, a valve cavity 9.3 disposed in the valve seat 9, a valve sleeve 8 disposed in the valve cavity 9.3, and a valve sleeve 8 slidably arranged on the valve sleeve 8. The inner spool 7 and the elastic pressing mechanism against the spool 7 are provided with an oil inlet 8.2 and an oil outlet 8.1 communicating with the valve cavity 9.3 on the valve seat 9. When the oil inlet 8.2 exceeds the set When the value is high, the oil will push up the spool 7, and the oil will flow out from the oil outlet 8.1.

In the present invention, the elastic pressing mechanism includes a cylinder body 11, a first valve body 12, a second valve body 10, a first piston 3 arranged in the cylinder body 11, and a valve body arranged between the first piston 3 and the second valve body 10. The elastic member between them, the first piston push rod 2 set on the first valve body 12, the chute 10.5 set on the second valve body 10, the second piston 5 fitted in the chute 10.5, and the chute set on the chute The second piston push rod 6 in 10.5, the chute 10.5 is arranged along the axial direction of the second valve body 10, one end of the chute 10.5 communicates with the inner cavity 11.2 of the corresponding elastic member of the cylinder body, and the other end of the chute 10.5 communicates with the valve cavity 9.3 Connectivity. One end of the second piston push rod 6 is set in the chute 10.5, and the other end abuts against the valve core 7, and the second piston push rod 6 is arranged on the second valve body 10 in a manner that can move axially along the chute 10.5 . The two ends of the spool 7 along the axial direction are respectively set as the first end 7.3 and the second end 7.4, the first end 7.3 is set corresponding to the second piston push rod 6, the second end 7.4 is set corresponding to the oil inlet 8.2, and the valve cavity 9.3 is set corresponding to The first end 7.3 and the second end 7.4 are respectively provided with a first chamber 10.1 and a second chamber 10.4, and also includes a first oil passage 10.2, and one end of the first oil passage 10.2 communicates with the first chamber 10.1 The other end of the first oil passage 10.2 communicates with the second chamber 10.4. In practice, the first oil passage 10.2 is partly opened in the valve seat 9 and partly opened in the second valve body 10. In the present invention, the area of the circumferential section of the spool 7 at the first end 7.3 is smaller than the area of the circumferential section at the second end 7.4, and the area of the circumferential section of the chute 10.5 is smaller than that of the corresponding elastic member of the cylinder body. The area of the inner chamber 11.2 along the circumferential cross section, so that the circumferential cross section area of the first piston 3 is larger than the circumferential cross section area of the second piston 5 .

As a preferred mode of the present invention, the first valve body 12 is provided with a first shaft hole and a bolt hole connected to each other, an adjusting bolt 13 is arranged in the bolt hole, and a limit nut 1 is sleeved on the adjusting bolt 13 , the first piston push rod 2 is inserted in the first shaft hole in a manner that can move axially along the first shaft hole, and one end of the first piston push rod 2 abuts against the first piston 3 , and the other end bears against the adjusting bolt 13.

As a preferred mode of the present invention, the first valve body 12 is provided with a first vent hole 12.1, and one end of the first vent hole 12.1 communicates with the cylinder body 11 (specifically connected to the inner cavity of the cylinder body without a spring) , and the other end is connected to the outside air.

As a preferred form of the present invention, the elastic member. Preferably, the second piston rod 6 has a second piston push rod circular end 6.1, and the second piston push rod circular end 6.1 abuts against the valve core 7.

As a preferred mode of the present invention, the first valve body 12 is threaded at one end of the cylinder body 11, the second valve body 10 is threaded at the other end of the cylinder body 11, and the second valve body 10 is threaded at the other end of the cylinder body 11. The valve body 10 is connected to the valve seat 9 by bolts.

As a preferred mode of the present invention, the inner cavity 11.2 of the cylinder body corresponding to the elastic member has a circumferential cross-sectional area much larger than the circumferential cross-sectional area of the slide groove 10.5, so that the first piston 3 and the second piston 5 has a large gap in the outer diameter, those skilled in the art can make corresponding settings according to the actual situation.

As a preferred mode of the present invention, a sealing ring is provided between the first piston 3 and the inner wall of the cylinder 11, and a sealing ring is provided between the second piston 5 and the inner wall of the chute 10.5 The second piston 5 is correspondingly provided with a second piston gas sealing ring installation groove 5.1 for installing the sealing ring. A sealing ring is provided between the valve sleeve 8 and the side wall of the valve cavity 9.3, and a sealing ring installation groove 8.3 is correspondingly provided on the valve sleeve 8 for installing the sealing ring. In the present invention, the second end 7.4 of the valve core 7 is provided with an annular boss 7.1, so that the area A ₁ of the second end 7.4 is larger than the area A ₂ of the first end.

As a preferred mode of the present invention, the second piston 5 divides the chute 10.5 into an upper chamber and a lower chamber, and also includes a second oil passage 10.3, one end of the second oil passage 10.3 is connected to the outlet The oil port 8.1 communicates, and the other end communicates with the lower chamber.

As a preferred mode of the present invention, the side wall of the valve core 7 is provided with a pressure equalizing groove 7.2.

As a preferred mode of the present invention, the side wall of the cylinder body 11 is provided with an air-inflated pressure-measuring port 11.1, and the air-inflated pressure-measuring port 11.1 penetrates from the inner wall of the cylinder body 11 to the outer wall, and the inflatable pressure-measuring port 11.1 is arranged on the Between the first piston 3 and the second valve body 10.

Concrete working principle of the present invention is as follows:

Inflation: Before inflating, turn the adjusting bolt 13 counterclockwise, the first piston 3 moves upward under the action of the spring 4, and the volume of the gas spring compression cavity (that is, the inner cavity 11.2 of the cylinder corresponding to the elastic member) increases; after the inflation is completed , Install a pressure gauge joint at the inflation pressure measurement port 11.1, which can be connected to a pressure gauge to perform real-time detection of the pressure _P3 of the gas spring compression chamber.

Pressure regulation: Turn the adjusting bolt 13 clockwise, the adjusting bolt 13 pushes the first piston push rod 2 to move downward, and the first piston push rod 2 moves downward against the first piston 3. During this process, the gas spring compresses The volume of the cavity gradually decreases, and the pressure _P3 gradually increases, and the value of _P3 can be observed through the pressure gauge installed at the gas pressure measuring port 11.1. The lower end of the spool 7 is provided with an annular boss 7.1, the upper surface area of the spool 7 is set as A ₂ , and the lower surface area is set as A ₁ , where A ₁ >A ₂ . The oil inlet 8.2 communicates with the first chamber 10.1 of the spool 7 through the first oil passage 10.2, so the high-pressure oil at the oil inlet 8.2 acts on the spool 7 with an area of A ₁ -A ₂ , and the design of the second piston The end surface area of 5 is A ₃ =A ₁ -A ₂ , then the setting pressure of the relief valve is equal to the pressure P ₃ of the gas spring compression chamber, so that the setting pressure of the relief valve can be adjusted in real time without opening the hydraulic oil source.

Relief valve work: When the pressure P ₁ of the oil inlet port 8.2 of the relief valve is greater than the set pressure P ₃ , the relief valve port is opened, and the maximum displacement of the relief valve spool 7 is h, the gas spring compression chamber 11.2 because The volume change caused by the opening of the spool 7 is A ₃ *h; the designed diameter of the second piston 5 is small for the entire relief valve, and the maximum displacement of the relief valve spool 7 is also a small value, so A larger volume of the gas spring compression chamber can be designed so that the pressure change of the gas spring compression chamber caused by the volume change caused by the opening of the valve core 7 can reach a negligible level. Therefore, _P3 remains constant during the opening process of the spool 7, effectively eliminating the pressure regulation deviation of the overflow valve.

In the present invention, the upper and lower ends of the gas spring are provided with two pistons with relatively different diameters, and the large piston at the upper end is used to quickly build up the internal pressure of the gas spring; the small piston at the lower end is connected to the overflow valve spool, It is used to output thrust to the overflow valve spool; the diameter of the small piston is very small, so the internal volume change of the gas spring caused by the opening process of the spool is very small, and the internal pressure of the gas spring can be basically kept constant, that is, during the opening process of the spool , The thrust of the gas spring on the spool can always be kept constant. The gas spring overflow valve uses ingenious structural design to effectively solve the problem of large pressure regulation deviation of the traditional indirect detection overflow valve.

The product form of the present invention is not limited to the illustrations and examples of this case, and anyone who makes appropriate changes or modifications of similar ideas to it shall be deemed not to depart from the scope of the patent of the present invention.

Claims (10)

1. A gas spring overflow valve, comprising a valve seat, a valve chamber arranged in the valve seat, a valve sleeve arranged in the valve chamber, a spool slidably arranged in the valve sleeve and abutted on the valve core The elastic top-pressing mechanism is provided with an oil inlet and an oil outlet connected to the valve cavity on the valve seat. It is characterized in that: the elastic top-pressing mechanism includes a cylinder body, a first valve body, a second valve body, The first piston in the body, the elastic member arranged between the first piston and the second valve body, the first piston push rod arranged on the first valve body, the chute opened on the second valve body, and the The second piston in the chute and the second piston push rod arranged in the chute, one end of the chute communicates with the inner cavity of the corresponding elastic member of the cylinder body, the other end of the chute communicates with the valve cavity, and the second piston push rod One end of the piston is set in the chute, the other end is against the spool, the second piston push rod is set on the second valve body in a manner that can move along the axial direction of the cylinder body, and the two ends of the spool along the axial direction are respectively set It is a first end and a second end, the first end is set corresponding to the second piston push rod, the second end is set corresponding to the oil inlet, the valve cavity is provided with a first chamber corresponding to the first end, and the valve cavity is corresponding to the second piston The two ends are provided with a second chamber, which also includes a first oil passage, one end of the first oil passage communicates with the first chamber, the other end of the first oil passage communicates with the second chamber, and the spool is in the first The circumferential section area of the end is smaller than that of the second end, and the circumferential section area of the chute is smaller than the circumferential section area of the cylinder cavity. 2. A gas spring overflow valve as claimed in claim 1, characterized in that: the first valve body is provided with a first shaft hole and a bolt hole connected to each other, and an adjusting bolt is arranged in the bolt hole, A limit nut is sleeved on the adjusting bolt, the first piston push rod is inserted in the first shaft hole in a manner that can move axially along the first shaft hole, and one end of the first piston push rod is abutted against the first shaft hole. On the first piston, the other end is against the adjusting bolt. 3. A gas spring overflow valve as claimed in claim 2, characterized in that: the first valve body is provided with a first vent hole, one end of the first vent hole communicates with the cylinder body, and the other end Connected to outside air. 4. A gas spring overflow valve according to claim 1, wherein the elastic member is a spring. 5. A gas spring overflow valve according to claim 1, characterized in that: said first valve body is threadedly connected to one end of said cylinder body, said second valve body is threadedly connected to said cylinder body The other end of the second valve body is connected to the valve seat by bolts. 6 . The gas spring relief valve according to claim 1 , wherein the cross-sectional area of the inner chamber of the cylinder body corresponding to the elastic member along the circumferential direction is much larger than the cross-sectional area of the slide groove along the circumferential direction. 7 . 7. A gas spring overflow valve according to claim 1, characterized in that: a sealing ring is provided between the first piston and the inner wall of the cylinder, and the second piston and the chute A sealing ring is provided between the inner walls of the valve body, a sealing ring is provided between the valve sleeve and the side wall of the valve cavity, and an annular boss is provided at the second end of the valve core. 8. A gas spring overflow valve as claimed in claim 1, characterized in that: said second piston divides said chute into an upper chamber and a lower chamber, and also includes a second oil circuit, a second One end of the oil passage communicates with the oil outlet, and the other end communicates with the lower chamber. 9. A gas spring overflow valve as claimed in claim 1, characterized in that: the side wall of the valve core is provided with a pressure equalizing groove. 10. A gas spring overflow valve as claimed in any one of claims 1 to 9, characterized in that: the side wall of the cylinder body is provided with an inflatable pressure measuring port, and the inflatable pressure measuring port is connected from the cylinder body The inner wall runs through to the outer wall, and the inflation pressure measuring port is arranged between the first piston and the second valve body.