CN108533763B

CN108533763B - Stop valve with controllable opening and closing speed

Info

Publication number: CN108533763B
Application number: CN201810735856.1A
Authority: CN
Inventors: 刘艳荣
Original assignee: Dongying North Petroleum Equipment Co ltd
Current assignee: DONGYING NORTH PETROLEUM EQUIPMENT Co.,Ltd.
Priority date: 2018-07-06
Filing date: 2018-07-06
Publication date: 2021-10-22
Anticipated expiration: 2038-07-06
Also published as: CN108533763A

Abstract

The invention relates to a stop valve with controllable opening and closing speed, which is characterized in that: the valve comprises a valve body, wherein a third oil port, a fourth oil port, a first damping channel and a second damping channel are formed in the valve body; the valve seat is provided with a first oil port and a second oil port; the valve core divides an inner cavity of the second bushing into an oil return cavity and a control cavity, the left and right sliding of the valve core can open and close a first oil port, a first through hole is formed in the valve core, and a first spring is arranged in the oil return cavity; the first bush is in a stepped shaft shape, and a balance cavity is formed at the right end of the thin shaft part of the first bush; the first bushing is provided with a second through flow hole and a third through flow hole, and the left and right sliding of the valve core can open and close the first oil port; the first one-way damping assembly is arranged in the first damping channel; and the second one-way damping assembly is arranged in the second damping channel. The invention has the advantages of simple and reasonable structure, low manufacturing cost, reliable stop, compact volume and controllable opening and closing speed.

Description

Stop valve with controllable opening and closing speed

Technical Field

The invention relates to a stop valve, in particular to a stop valve with controllable opening and closing speed.

Background

A shut-off valve, also called a stop valve, is a valve which is used most widely and is mainly used for cutting off or connecting various fluid media. The stop valve products on the market at present are generally opened and closed by adopting a manual, electric or pneumatic driving mode, the pressure of the manual stop valve is generally higher and can reach 100MPa at most, but the operation of the manual stop valve needs manual implementation on site, so the use has certain limitation; the electric or pneumatic stop valve can be remotely operated, but the working pressure is generally not high and is 40MPa at most due to the limitation of the size and power of a driving element; in addition, the opening and closing speed of the electric or pneumatic stop valve is not controllable, the practical application working conditions are various, some working conditions need to be opened quickly, and some working conditions need to be opened and closed slowly in order to prevent impact, so that the application of the electric or pneumatic stop valve is also limited.

Disclosure of Invention

The invention aims to solve the technical problem of providing a stop valve which is simple and reasonable in structure, compact and controllable in opening and closing speed aiming at the current situation of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a controllable stop valve of opening and close speed which characterized in that: the valve comprises a valve body with an axial blind hole, wherein a fourth oil port communicated with the axial blind hole is formed in the side wall of the valve body, a third oil port is further formed in the side wall of the valve body, and a first damping channel and a second damping channel which are used for communicating the third oil port with the axial blind hole are further arranged in parallel at the left end of the axial blind hole in the valve body; the valve seat is fixed at the right end of the axial blind hole, a first oil port communicated with the axial blind hole is formed in the right end face of the valve seat, and a second oil port communicated with the axial blind hole is formed in the side wall of the valve seat; the valve core is arranged in the second bushing and can slide left and right, an inner cavity of the second bushing is divided into an independent oil return cavity and a control cavity by the valve core, the right end of the valve core penetrates out of the second bushing and is matched with the first oil port, the first oil port can be opened and closed by the left and right sliding of the valve core, a first through hole which penetrates axially and is always communicated with the first oil port is formed in the valve core, a spring is arranged in the oil return cavity, and the spring acts on the valve core and enables the valve core to keep the trend of moving left to open the first oil port; the first bushing is in a stepped shaft shape, the right part of the first bushing is inserted into the inner cavity of the second bushing, sealing structures are arranged between the periphery of the large shaft part of the first bushing and the inner walls of the axial blind hole and the control cavity respectively, the thin shaft part of the first bushing extends into the left end of the first through hole, the sealing structures are arranged between the periphery of the thin shaft part of the first bushing and the inner wall of the left end of the first through hole, so that a balance cavity is formed in the first through hole at the right end of the thin shaft part of the first bushing, and a first action area of oil pressure in the first oil port acting on the right end of the valve core is equal to a second action area of oil pressure in the balance cavity acting on the valve core; the first bushing is provided with a second through hole communicated with the first damping channel and the second damping channel and a third through hole communicated with the second through hole, and the side wall of the thin shaft part of the first bushing is provided with a fourth through hole used for communicating the third through hole with the control cavity; a damping hole for communicating the oil return cavity with the fourth oil port is formed in the side wall of the second bushing; a first one-way damping assembly disposed within the first damping channel, the first one-way damping assembly configured to: when the oil flows into the second through hole from the third oil port, the damping size of the first damping channel can be adjusted by adjusting the first one-way damping assembly, and when the oil flows into the second through hole from the third oil port, the first one-way damping assembly closes the first damping channel, and the first damping channel is stopped and is not communicated; a second unidirectional damping assembly disposed within the second damping channel, the second unidirectional damping assembly configured to: when oil flows into the second through-flow hole from the third oil port, the damping size of the second damping channel can be adjusted by adjusting the second one-way damping assembly, and when the oil flows into the third oil port from the second through-flow hole, the second one-way damping assembly closes the second damping channel, and the second damping channel is closed and is not communicated.

The first damping channel comprises a first axial hole, a first radial hole and a third axial hole which are sequentially communicated, the second damping channel comprises a second axial hole, a first radial hole and a third axial hole which are sequentially communicated, the first radial hole communicates the first axial hole, the second axial hole and the third axial hole, the third axial hole is communicated with a third oil port, the first axial hole and the second axial hole are respectively communicated with the second through hole, the first radial hole is a stepped hole and is formed with a step between the first axial hole and the second axial hole, and the second axial hole is of a three-section structure with a small middle diameter and large diameters at two sides.

The first one-way damping assembly comprises a first adjusting screw and a first steel ball, the first adjusting screw is in threaded connection with the first axial hole, and the first steel ball is arranged in the large aperture of the first radial hole and can block the small aperture; the second one-way damping assembly comprises a second adjusting screw and a second steel ball, the second adjusting screw is in threaded connection with the inside of the large aperture on the outer side of the second axial hole, and the second steel ball is arranged in the large aperture on the inner side of the second axial hole and can block the small aperture in the middle of the second axial hole.

Compared with the prior art, the invention has the advantages that:

the invention is designed in a plug-in mode, and has compact volume and simple and reasonable structure; the opening speed of the valve core is adjusted by arranging the first damping channel and the second damping channel which are parallel, arranging the first one-way damping assembly in the first damping channel, and adjusting the closing speed of the valve core by arranging the second one-way damping assembly in the second damping channel, so that the opening and closing speed of the valve core is controllable, and the opening and closing speed can be independently adjusted without influencing each other; the balance of the action area of the pressure of the first oil port on the valve core is realized by inserting the first lining into the inner hole of the valve core, so that the pressure of the first oil port and the pressure of the second oil port have no influence on the opening and closing of the valve core, and are only related to the pressure of the third oil port, and the valve core can be reliably in an opening or closing state without the influence of the pressure of the first oil port and the second oil port.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

fig. 2 is a hydraulic schematic of an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in FIGS. 1-2, a preferred embodiment of the present invention is shown.

A stop valve, characterized by: comprises that

The valve comprises a valve body 1 with an axial blind hole 101, wherein a fourth oil port D communicated with the axial blind hole 101 is formed in the side wall of the valve body 1, a third oil port C is further formed in the side wall of the valve body 1, and a first damping channel and a second damping channel which are used for communicating the third oil port C with the axial blind hole 101 are further arranged in the valve body 1 in parallel at the left end of the axial blind hole 101; the first damping channel comprises a first axial hole 102, a first radial hole 104 and a third axial hole 105 which are communicated in sequence, the second damping channel comprises a second axial hole 103, a first radial hole 104 and a third axial hole 105 which are communicated in sequence, the first radial hole 104 communicates the first axial hole 102, the second axial hole 103 and the third axial hole 105, the third axial hole 105 is communicated with a third oil port C, the first axial hole 102 and the second axial hole 103 are communicated with a second through hole 21 respectively, the first radial hole 104 is a stepped hole and is provided with a step between the first axial hole 102 and the second axial hole 103, and the second axial hole 103 is a three-section structure with a small middle diameter and large two-side diameters.

And the valve seat 6 is fixed at the right end of the axial blind hole 101, a first oil port A communicated with the axial blind hole 101 is formed in the right end face of the valve seat 6, and a second oil port B communicated with the axial blind hole 101 is formed in the side wall of the valve seat 6.

First bush 2, second bush 3 and case 5, first bush 2 and second bush 3 are fixed in axial blind hole 101, and case 5 is located in second bush 3 and can control and slide, and case 5 separates into independent back oil chamber 1b and control chamber 1a with second bush 3 inner chamber, and second bush 3 and the cooperation of first hydraulic fluid port A are worn out to case 5's right-hand member, and the slip can be opened and close about case 5 first hydraulic fluid port A is equipped with the axial in the case 5 and runs through and the first through-flow hole 51 that communicates with first hydraulic fluid port A all the time, be equipped with spring 4 in the back oil chamber 1b, this spring 4 acts on case 5 and makes case 5 keep moving left and open first hydraulic fluid port A trend.

The first bush 2 is in a stepped shaft shape, the right part of the first bush 2 is inserted into the inner cavity of the second bush 3, a sealing structure is arranged between the periphery of the large shaft part of the first bush 2 and the inner wall of the axial blind hole 101 and the inner wall of the control cavity 1a respectively, the thin shaft part of the first bush 2 extends into the left end of the first through flow hole 51, a sealing structure is arranged between the periphery of the thin shaft part of the first bush 2 and the inner wall of the left end of the first through flow hole 51, so that a balance cavity 5a is formed in the first through flow hole 51 at the right end of the thin shaft part of the first bush 2, and the first acting area D2 of the oil pressure in the first oil port A, which acts on the right end of the valve core 5, is equal to the second acting area D1 of the oil pressure in the balance cavity 5a, which acts on the valve core 5.

The first liner 2 is provided with a second through-hole 21 communicating with the first orifice passage and the second orifice passage and a third through-hole 22 communicating with the second through-hole 21, and the side wall of the slender shaft portion of the first liner 2 is provided with a fourth through-hole 23 for communicating the third through-hole 22 with the control chamber 1 a.

And a damping hole 3a communicated with the oil return cavity 1b and the fourth oil port D is formed in the side wall of the second bush 3.

The first one-way damping assembly is arranged in the first damping channel and comprises a first adjusting screw 8a and a first steel ball 7a, the first adjusting screw 8a is connected in the first axial hole 102 in a threaded manner, and the first steel ball 7a is arranged in the large aperture of the first radial hole 104 and can block the small aperture; when the oil flows into the third oil port C from the second through-flow hole 21, the damping between the second through-flow hole 21 and the third oil port C can be changed by adjusting the screwing-in length of the thread of the first adjusting screw 8a, and when the oil flows into the second through-flow hole 21 from the third oil port C, the first steel ball 7a blocks the small aperture of the first radial hole 104, so that the first damping channel is closed, and the first damping channel is blocked; specifically, by changing the screwing length of the first adjusting screw 8a, the length between the first adjusting screw 8a and the mating thread of the first axial hole 102 through which the oil flows from the second through-flow hole 21 into the third port C can be changed, the oil flows through the gap between the mating threads, and if the screwing length of the first adjusting screw 8a is long, the damping effect of the first damping passage is large, and otherwise, the damping effect is small.

The second one-way damping component is arranged in the second damping channel and comprises a second adjusting screw 8b and a second steel ball 7b, the second adjusting screw 8b is connected in the large aperture on the outer side of the second axial hole 103 in a threaded mode, and the second steel ball 7b is arranged in the large aperture on the inner side of the second axial hole 103 and can block the small aperture in the middle of the second axial hole. When the oil flows into the second through-flow hole 21 from the third oil port C, the length between the matched thread teeth through which the oil flows can be changed by adjusting the screwing-in length of the thread of the second adjusting screw 8b, so that the damping size of the second damping channel is changed, and when the oil flows into the third oil port C from the second through-flow hole 21, the second steel ball 7b blocks the small aperture in the middle of the second axial hole 103, so that the second damping channel is closed, and the second damping channel is blocked; specifically, by changing the screwing length of the second adjusting screw 8b, the length between the second adjusting screw 8b through which the oil flows from the third port C into the second through-flow hole 21 and the mating thread of the second axial hole 103 can be changed, the oil flows through the gap between the mating threads, and if the screwing length of the second adjusting screw 8b is long, the damping effect of the second damping passage is large, and otherwise, the damping effect is small.

The stop valve with controllable opening and closing speed has the following working principle and process:

when the hydraulic control system is applied, the fourth oil port D is connected with an oil tank, and the third oil port C is communicated with hydraulic control pressure oil.

When the third oil port C is in an unloading state, the acting force generated by the pressure of the oil return cavity 1B and the pressure of the control cavity 1a on the valve core 5 are balanced, the valve core 5 moves left under the acting force of the spring 4 to open the first oil port a, and the first oil port a and the second oil port B are in a conducting state. The pressure of the second oil port B has no action area on the valve core 5, so the pressure of the second oil port B does not influence the opening or closing of the valve core 5; the first port a acts on the first acting area D1 of the valve element 5 to generate a leftward thrust, and simultaneously enters the balance cavity 5a through the first through hole 51 to act on the second acting area D2 to generate a rightward thrust, because the first acting area D1 is equal to the second left and right area D2, the acting force of the pressure of the first port a on the valve element 5 is balanced, and the valve element 5 is only under the acting force of the spring 4, and the valve element 5 can be reliably in an open state no matter how the pressures of the first port a and the second port B change.

When the pressure of the third oil port C rises to the set pressure of the spring 4, the oil sequentially passes through the third axial hole 105, the first radial hole 104, the thread clearance matched with the second axial hole 103 by the second adjusting screw 8B from the third oil port C, then backs up the second steel ball 7B to flow into the second through-flow hole 21, then enters the control cavity 1a through the third through-flow hole 22 and the fourth through-flow hole 23 to push the valve core 5 to move right to block the first oil port a, and the first oil port a and the second oil port B are blocked and are not communicated. If the second adjusting screws 8b are all screwed in, the closing speed of the valve core 5 is slowest, and the closing buffer effect is best; if the second adjusting screw 8b is screwed out to the left end of the first radial hole, the oil of the third oil port C does not pass through the damping action of the thread clearance when flowing into the control cavity 1a, and the closing speed of the valve core 5 is the fastest at the moment.

When the pressure of the third port C is rapidly reduced from the pressure for opening the valve core 5, the oil in the control chamber 1a sequentially passes through the fourth through-flow hole 23, the third through-flow hole 22, the second through-flow hole 21, the thread clearance where the first adjusting screw 8a is matched with the first axial hole 102, then jacks the first steel ball 7a to enter the first radial hole 104, and then flows into the third port C through the third axial hole 105, and the valve core 5 moves leftwards under the action of the spring 4 to open the first port a. If the first adjusting screws 8a are all screwed in, the opening speed of the valve core 5 is slowest, and the opening buffering effect is best; if the first adjusting screw 8a is screwed out to the left end of the first radial hole, the oil in the control cavity 1a does not pass through the damping action of the thread clearance when flowing into the third oil port C, and the opening speed of the valve core 5 is the fastest at the moment.

Claims

1. The utility model provides a controllable stop valve of opening and close speed which characterized in that: comprises that

The damping valve comprises a valve body (1) with an axial blind hole (101), wherein a fourth oil port (D) communicated with the axial blind hole (101) is formed in the side wall of the valve body (1), a third oil port (C) is further formed in the side wall of the valve body (1), and a first damping channel and a second damping channel which are used for communicating the third oil port (C) with the axial blind hole (101) are further arranged in the valve body (1) in parallel at the left end of the axial blind hole (101);

the valve seat (6) is fixed at the right end of the axial blind hole (101), a first oil port (A) communicated with the axial blind hole (101) is formed in the right end face of the valve seat (6), and a second oil port (B) communicated with the axial blind hole (101) is formed in the side wall of the valve seat (6);

the hydraulic oil return device comprises a first bushing (2), a second bushing (3) and a valve core (5), wherein the first bushing (2) and the second bushing (3) are fixed in an axial blind hole (101), the valve core (5) is arranged in the second bushing (3) and can slide left and right, the inner cavity of the second bushing (3) is divided into an independent oil return cavity (1b) and a control cavity (1a) by the valve core (5), the right end of the valve core (5) penetrates through the second bushing (3) and is matched with a first oil port (A), the first oil port (A) can be opened and closed by the left and right sliding of the valve core (5), a first through flow hole (51) which axially penetrates through and is always communicated with the first oil port (A) is formed in the valve core (5), a spring (4) is arranged in the oil return cavity (1b), and the spring (4) acts on the valve core (5) and enables the valve core (5) to keep the trend of opening the first oil port (A) by left sliding;

the first bushing (2) is in a stepped shaft shape, the right part of the first bushing (2) is inserted into an inner cavity of the second bushing (3), a sealing structure is arranged between the periphery of the large shaft part of the first bushing (2) and the inner wall of the axial blind hole (101) and the inner wall of the control cavity (1a), the small shaft part of the first bushing (2) extends into the left end of the first through-flow hole (51), a sealing structure is arranged between the periphery of the small shaft part of the first bushing (2) and the inner wall of the left end of the first through-flow hole (51), so that a balance cavity (5a) is formed in the first through-flow hole (51) at the right end of the small shaft part of the first bushing (2), and a first action area (D2) of oil pressure in the first oil port (A) acting on the right end of the valve core (5) is equal to a second action area (D1) of the oil pressure acting on the valve core (5) in the balance cavity (5 a);

a second through hole (21) communicated with the first damping channel and the second damping channel and a third through hole (22) communicated with the second through hole (21) are formed in the first bushing (2), and a third through hole (23) used for communicating the third through hole (22) with the control cavity (1a) is formed in the side wall of the thin shaft part of the first bushing (2);

a damping hole (3a) communicated with the oil return cavity (1b) and the fourth oil port (D) is formed in the side wall of the second bushing (3);

a first one-way damping assembly disposed within the first damping channel, the first one-way damping assembly configured to: when the oil liquid flows into the third oil port (C) from the second through hole (21), the damping size of the first damping channel can be adjusted by adjusting the first one-way damping assembly, and when the oil liquid flows into the second through hole (21) from the third oil port (C), the first one-way damping assembly closes the first damping channel, and the first damping channel is stopped and is not communicated;

a second unidirectional damping assembly disposed within the second damping channel, the second unidirectional damping assembly configured to: when the oil liquid flows into the second through-flow hole (21) from the third oil port (C), the damping size of the second damping channel can be adjusted by adjusting the second one-way damping assembly, and when the oil liquid flows into the third oil port (C) from the second through-flow hole (21), the second one-way damping assembly closes the second damping channel, and the second damping channel is stopped and is not communicated.

2. A stop valve with controllable opening and closing speed according to claim 1, characterized in that: the first damping channel comprises a first axial hole (102), a first radial hole (104) and a third axial hole (105) which are sequentially communicated, the second damping channel comprises a second axial hole (103), a first radial hole (104) and a third axial hole (105) which are sequentially communicated, the first axial hole (102), the second axial hole (103) and the third axial hole (105) are communicated through the first radial hole (104), the third axial hole (105) is communicated with a third oil port (C), the first axial hole (102) and the second axial hole (103) are respectively communicated with the second through hole (21), the first radial hole (104) is a stepped hole and a step is formed between the first axial hole (102) and the second axial hole (103), and the second axial hole (103) is a three-section structure with a small middle diameter and a large two-side diameter.

3. A stop valve with controllable opening and closing speed according to claim 2, characterized in that: the first one-way damping assembly comprises a first adjusting screw (8a) and a first steel ball (7a), the first adjusting screw (8a) is in threaded connection with the first axial hole (102), and the first steel ball (7a) is arranged in the large aperture of the first radial hole (104) and can block the small aperture of the first radial hole; the second one-way damping assembly comprises a second adjusting screw (8b) and a second steel ball (7b), the second adjusting screw (8b) is in threaded connection with the large aperture on the outer side of the second axial hole (103), and the second steel ball (7b) is arranged in the large aperture on the inner side of the second axial hole (103) and can block the small aperture in the middle of the second axial hole.