CN109538563B

CN109538563B - Balance valve

Info

Publication number: CN109538563B
Application number: CN201811403228.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Kaisitong Valve Co ltd
Current assignee: KAISITONG VALVE Co.,Ltd.
Priority date: 2018-11-23
Filing date: 2018-11-23
Publication date: 2020-08-04
Anticipated expiration: 2038-11-23
Also published as: CN109538563A

Abstract

The invention proposes a balancing valve comprising: the valve comprises a valve body, a valve seat, a plug, a stop valve core, a steel ball, a first spring, a first check ring, a reversing valve core, a second spring, a spring seat, a control valve core, a second check ring, a third spring and a proportional electromagnet. The balance valve disclosed by the embodiment of the invention is energy-saving and does not need a pilot handle and a hydraulic control proportional multi-way valve.

Description

Balance valve

Technical Field

The present invention relates to a valve, and more particularly to a balanced valve.

Background

In modern mechanical equipment such as engineering machinery, construction machinery and the like, a large number of lifting hydraulic loops are applied, wherein a balance valve is a key hydraulic element for controlling the work of a hydraulic oil cylinder in the lifting loop, and the performance of the balance valve directly influences the performance of a main machine. Since the balancing valve mainly increases the back pressure and the set pressure is usually 30% -50% greater than the maximum load, the balancing valve is an energy consuming element in the system and is stabilized by the consumption of power. At present, the prior art is fixed with set pressure, generally 1.3-1.5 times of maximum load, when the load is reduced or no load, the back pressure is required to be as large as that when the load is fully loaded, so that the pilot pressure must be increased to open the set pressure, unnecessary useless power output is caused, and energy waste is caused. In addition, in the prior art, a hydraulic circuit containing a balance valve generally consists of a hydraulic control proportional multi-way valve, a pilot handle and the balance valve, so that the hydraulic circuit not only consumes energy, but also has complex structure and high overall cost.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

To this end, it is an object of the invention to provide an energy-saving balancing valve which does not require a pilot handle and a pilot-operated proportional multi-way valve.

A balanced valve according to an embodiment of the invention comprises:

the valve body is provided with a first mounting hole, a second mounting hole and a communication hole for communicating the first mounting hole with the second mounting hole, the second mounting hole is a stepped hole with the diameter gradually reduced from bottom to top, a first through flow groove, a second through flow groove and a third through flow groove are arranged in the valve body at intervals from top to bottom and are communicated with the first mounting hole, a fourth through flow groove communicated with the second mounting hole is arranged in the valve body, a first oil port communicated with the first through flow groove, a second oil port communicated with the second through flow groove, a third oil port communicated with the third through flow groove and a fourth oil port communicated with the fourth through flow groove are arranged on the side wall of the valve body, and a first sealing conical surface is arranged at the joint of the second mounting hole and the communication hole in the valve body;

the plug is detachably arranged on the second mounting hole to seal the lower end of the second mounting hole;

the balance valve core is arranged in the second mounting hole in a vertically sliding manner and positioned above the plug, the balance valve core comprises a first shoulder in sliding fit with the large-hole part of the second mounting hole, a second shoulder in sliding fit with the small-hole part of the second mounting hole and a third shoulder matched with the first sealing conical surface from bottom to top to control the first mounting hole and the second mounting hole to be switched on and off, the second shoulder is provided with a small-hole part used for communicating the second mounting hole and a second throttling groove of the fourth oil port, the balance valve core is provided with a balance valve core through hole which is communicated up and down, the balance valve core through hole comprises a balance valve core through hole upper section, a balance valve core through hole expanding section, a balance valve core through hole middle section and a balance valve core through hole lower section from top to bottom, and the joint of the balance valve core through hole upper section and the balance valve core through hole expanding section is provided with a second sealing conical surface, a first through hole which is communicated with the diameter-expanding section of the through hole of the balance valve core and the lower section of the through hole of the balance valve core is arranged in the balance valve core, a damping hole which is communicated with the fourth through hole and the first through hole is formed in the side wall of the second shoulder, and a first control cavity is defined between the plug and the balance valve core;

the plug is fixedly arranged in the middle section of the through hole of the balance valve core so as to block the communication between the middle section of the through hole of the balance valve core and the lower section of the through hole of the balance valve core;

the lower end of the first spring abuts against the plug, the upper end of the first spring extends into the lower section of the through hole of the balance valve core and abuts against the lower step surface of the middle section of the through hole of the balance valve core, and the first spring pushes the balance valve core upwards to enable the upper end surface of the balance valve core to close the first sealing conical surface;

the control valve core comprises a control valve core sliding section and a control valve core reducing section, wherein the control valve core sliding section can be matched in the middle section of the through hole of the balance valve core in an up-and-down sliding mode, the control valve core reducing section is positioned above the control valve core sliding section, the upper end of the control valve core sliding section upwards extends into the upper section of the through hole of the balance valve core, the upper end face of the control valve core sliding section is matched with the second sealing conical surface to control the connection and disconnection of the diameter expanding section of the through hole of the balance valve core and the upper section of the through hole of the balance valve core, a control valve core blind hole with a downward opening is formed in the control valve core, the upper end of the control valve core blind hole upwards extends to the control valve core reducing section, and the control;

the reversing valve core is arranged in the first mounting hole in a vertically sliding manner and comprises a first sliding section, a first reducing section, a second sliding section and a second reducing section from top to bottom, the second reducing section extends downwards into the upper section of the through hole of the balance valve core and abuts against the reducing section of the control valve core, and a first throttling groove used for communicating the first oil port and the second oil port is formed in the second sliding section;

the second spring is arranged in the middle section of the through hole of the balance valve core, the lower end of the second spring abuts against the plug, the upper end of the second spring abuts against the control valve core, and the second spring normally pushes the control valve core upwards so that the upper end face of the sliding section of the control valve core normally seals the second sealing conical surface;

the proportional electromagnet is arranged on the valve body to seal the upper end of the first mounting hole, and a push rod of the proportional electromagnet extends downwards into the first mounting hole to abut against the upper end of the control valve core;

when the proportional electromagnet is powered off, the second spring pushes the control valve core and the reversing valve core to move upwards to lift the push rod upwards, the sliding section of the control valve core moves upwards to close the second sealing conical surface, the first spring pushes the third shoulder of the balance valve core to move upwards to close the first sealing conical surface to cut off the communication between the third oil port and the fourth oil port, the reversing valve core moves upwards to make the second oil port communicated with the third oil port, and the first oil port and the second oil port are disconnected;

when the proportional electromagnet is powered on, the push rod pushes the reversing valve core and the control valve core to move downwards simultaneously, the sliding section of the control valve core moves downwards to open the second sealing conical surface, the balance valve core moves downwards under the pressure difference between the fourth oil port and the first control cavity to open the first sealing conical surface and enable the fourth oil port to be communicated with the third oil port through the second throttling groove, after the reversing valve core moves downwards, the second sliding section of the reversing valve core cuts off the communication between the second oil port and the third oil port, and the first oil port is communicated with the second oil port through the first throttling groove.

Advantageously, the reversing valve core is provided with a communication flow passage for communicating the third oil port with the upper end face of the first sliding section.

Advantageously, the first throttling groove is a plurality of rectangular grooves uniformly distributed along the circumference of the reversing valve core.

Advantageously, the second throttling groove is a plurality of rectangular grooves uniformly distributed along the circumference of the second shoulder of the balance valve core.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic diagram of a balanced valve according to one embodiment of the invention;

FIG. 2 is a schematic illustration of a valve body structure of a balancing valve according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of a diverter spool configuration for a balanced valve according to one embodiment of the present invention;

FIG. 4 is a schematic diagram of a balanced valve cartridge configuration of a balanced valve according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a control spool structure of a balance valve according to one embodiment of the invention;

FIG. 6 is a hydraulic schematic of a balancing valve according to one embodiment of the present invention;

FIG. 7 is a hydraulic schematic of one application scenario of a balancing valve according to one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The balance valve according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 5, a balance valve according to an embodiment of the present invention includes: the valve comprises a valve body 1, a balance valve core 2, a plug 3, a control valve core 4, a first spring 5a, a second spring 5b, a reversing valve core 6, a plug 7 and a proportional electromagnet 8.

Specifically, the valve body 1 is provided with a first mounting hole 107, a second mounting hole 106 and a communication hole 108 for communicating the first mounting hole 107 with the second mounting hole 106, the second mounting hole 106 is a stepped hole with a diameter decreasing from bottom to top, the valve body 1 is provided with a first through flow groove 101, a second through flow groove 102 and a third through flow groove 103 which are arranged at intervals from top to bottom and are communicated with the first mounting hole 107, the valve body 1 is provided with a fourth through flow groove 104 communicated with the second mounting hole 106, the side wall of the valve body 1 is provided with a first oil port P communicated with the first through flow groove 101, a second oil port a communicated with the second through flow groove 102, a third oil port T communicated with the third through flow groove 103 and a fourth oil port B communicated with the fourth through flow groove 104, and a first sealing conical surface 105 is arranged at the connection position of the second mounting hole 106 and the communication hole 108 in the valve body 1.

The plug 7 is detachably mounted on the second mounting hole 106 to close the lower end of the second mounting hole 106.

The balance valve core 2 is arranged in the second mounting hole 106 in a vertically sliding manner and is positioned above the plug 7, the balance valve core 2 comprises a first shoulder 205 in sliding fit with the large-hole part of the second mounting hole 106, a second shoulder 206 in sliding fit with the small-hole part of the second mounting hole 106 and a third shoulder 207 matched with the first sealing conical surface 105 to control the on-off of the first mounting hole 107 and the second mounting hole 106 from bottom to top, the second shoulder 206 is provided with a second throttling groove 24 for communicating the small-hole part of the second mounting hole 106 and a fourth oil port B, the second throttling groove 24 is a plurality of rectangular grooves uniformly distributed along the circumference of the second shoulder 206 of the balance valve core, the balance valve core 2 is provided with a balance valve core through hole which is communicated from top to bottom, the balance valve core through hole comprises a balance valve core through hole upper section 201, a balance valve core through hole expanding section 202, a balance valve core through hole middle section 203 and a balance valve core through hole lower, the joint of the balance valve core through hole upper section 201 and the balance valve core through hole expanding section 202 is provided with a second sealing conical surface 23, a first through hole 22 which is communicated with the balance valve core through hole expanding section 202 and the balance valve core through hole lower section 204 is arranged in the balance valve core 2, a damping hole 21 which is communicated with the fourth through hole 104 and the first through hole 22 is arranged on the side wall of the second shoulder 206, and a first control cavity 1a is defined between the plug 7 and the balance valve core 2.

The plug 3 is fixedly arranged in the middle section 203 of the through hole of the balance valve core to block the communication between the middle section 203 of the through hole of the balance valve core and the lower section 204 of the through hole of the balance valve core.

The first spring 5a is arranged in the second mounting hole 106, the lower end of the first spring 5a abuts against the plug 7, the upper end of the first spring 5a extends into the lower section 204 of the through hole of the balanced valve core and abuts against the lower step surface of the middle section 203 of the through hole of the balanced valve core, and the first spring 5a normally pushes the balanced valve core 2 upwards so that the upper end surface of the balanced valve core 2 normally closes the first sealing conical surface 105.

The control valve core 4 comprises a control valve core sliding section 41 which can be matched in the middle section 203 of the through hole of the balance valve core in a vertically sliding mode and a control valve core reducing section 42 which is positioned on the control valve core sliding section 41 and the upper end of which upwards extends into the upper section 201 of the through hole of the balance valve core, the upper end surface of the control valve core sliding section 41 is matched with the second sealing conical surface 23 to control the connection and disconnection of the diameter expanding section 202 of the through hole of the balance valve core and the upper section 201 of the through hole of the balance valve core, a control valve core blind hole 43 with a downward opening is formed in the control valve core 4, the upper end of the control valve core blind hole 43 upwards extends to the control valve core reducing section 42, and the control valve core reducing section 42 is provided with a control valve core through hole 44 which.

The reversing valve core 6 is slidably arranged in the first mounting hole 107 up and down, the reversing valve core 6 comprises a first sliding section 601, a first reducing section 602, a second sliding section 603 and a second reducing section 604 from top to bottom, the second reducing section 604 extends downwards into the balance valve core through hole upper section 201 to abut against the reducing section 42 of the control valve core, and the second sliding section 603 is provided with a first throttling groove 61 for communicating the first oil port P and the second oil port A. The first throttle grooves 61 are a plurality of rectangular grooves evenly distributed along the circumference of the reversing valve core 6. The reversing valve core 6 is provided with a communication flow passage 62 for communicating the third oil port T with the upper end surface of the first sliding section 601.

The second spring 5b is arranged in the middle section 203 of the through hole of the balance valve core, the lower end of the second spring 5b abuts against the plug 3, the upper end of the second spring 5b abuts against the control valve core 4, and the second spring 5b normally pushes the control valve core 4 upwards to normally seal the second sealing conical surface 23 on the upper end surface of the sliding section 41 of the control valve core.

The proportional electromagnet 8 is arranged on the valve body 1 to seal the upper end of the first mounting hole 107, and a push rod 81 of the proportional electromagnet 8 extends downwards into the first mounting hole 107 to abut against the upper end of the control valve core 6;

when the proportional electromagnet 8 loses power, the second spring 5B pushes the control valve core 4 and the reversing valve core 6 to move upwards to lift the push rod 81, the control valve core sliding section 41 moves upwards to seal the second sealing conical surface 23, the first spring 5a pushes the third shoulder 207 of the balance valve core 2 to move upwards to seal the first sealing conical surface 105 to cut off the communication between the third oil port T and the fourth oil port B, the reversing valve core 6 moves upwards to communicate the second oil port a with the third oil port T, and the first oil port P and the second oil port a are cut off.

When the proportional electromagnet 8 is powered on, the push rod 81 pushes the reversing valve element 6 and the control valve element 4 to move downwards at the same time, the control valve element sliding section 41 moves downwards to open the second sealing conical surface 23, the balance valve element 2 moves downwards under the pressure difference between the fourth oil port B and the first control cavity 1a to open the first sealing conical surface 105 and enable the fourth oil port B to be communicated with the third oil port T through the second throttling groove 24, after the reversing valve element 6 moves downwards, the reversing valve element second sliding section 603 cuts off the communication between the second oil port a and the third oil port T, and the first oil port P is communicated with the second oil port a through the first throttling groove 61.

The operation of the balancing valve according to an embodiment of the present invention will be briefly described.

As shown in fig. 1, when the proportional electromagnet 8 is not powered, under the action of the second spring 5B, the control spool sliding section 41 moves upward to close the second sealing conical surface 23, and under the combined action of the pressures of the first spring 5a and the fourth port B, the third shoulder 207 blocks the first conical surface 105 (the pressure oil sequentially acts on the circumferential area of the first shoulder 205 through the fourth port B, the damping hole 21, the first through-flow hole 22 and the first control cavity 1a, so that the third shoulder 207 moves upward to block the first conical surface 105), the first control cavity 1a and the third port T are disconnected, and the fourth port B and the third port T are not disconnected; meanwhile, the second oil port A is communicated with the third oil port T, and the first oil port P is disconnected with the second oil port A. The upper end surface and the lower end surface of the reversing valve core 6 are communicated with the third oil port T through the communicating flow passage 62, so that the stress on the upper end surface and the lower end surface of the reversing valve core 6 is balanced and only is acted by the push rod 81 and the second spring 5 b.

When the proportional electromagnet 8 is powered, the push rod 81 pushes the reversing valve core 6 and the control valve core 4 to move downwards at the same time, the sliding section 41 of the control valve core moves downwards to open the second sealing conical surface 23, oil passes through the damping hole 21, the first through-flow hole 22, the balanced valve core through-hole expanding section 202 and the balanced valve core through-hole upper section 201 in sequence from the fourth oil port B and then flows into the third oil port T, pressure difference is generated between the fourth oil port B and the first control cavity 1a due to the action of the damping hole 21, the balanced valve core 2 moves downwards to open the first sealing conical surface 105 under the pressure difference between the fourth oil port B and the first control cavity 1a (wherein the pressure of the fourth oil port B acts on the annular area of the first shoulder 205 and the annular area of the second shoulder 206 to generate downward thrust, and the pressure of the first control cavity 1a acts on the circumferential area of the first shoulder 205 to generate upward thrust), so that the third oil port T is communicated with the third oil port T through the second throttling groove 24, after the reversing valve core 6 moves downwards, the second sliding section 603 of the reversing valve core blocks the communication between the second oil port a and the third oil port T, and the first oil port P is communicated with the second oil port a through the first throttling groove 61. When the reversing valve core 2 moves downwards, the opening between the upper end surface of the control valve core sliding section 41 and the second sealing conical surface 23 is reduced, the pressure difference between the fourth oil port B and the first control cavity 1a is reduced, and the stress of the balance valve core 2 is balanced.

The voltage on the proportional electromagnet 8 is continuously increased, the reversing valve core 6 and the control valve core 4 continue to move downwards, the balance valve core 2 continues to move downwards under the action of the pressure difference between the fourth oil port P and the first control cavity 1a, the opening degrees of the first throttling groove 61 and the second throttling groove 24 are increased, and the second oil port A is disconnected from the third oil port T; the pressure difference between the fourth oil port B and the first control chamber 1a is reduced after the balance valve element 2 moves downward again, and the balance valve element 2 reaches a new balance point again.

In summary, the larger the voltage of the electromagnet 8 in a given ratio, the larger the opening degree between the first port P and the second port a, and the larger the opening degree between the fourth port B and the third port T.

Fig. 7 is a hydraulic schematic diagram of an application scenario of a balancing valve according to an embodiment of the present invention. In which two counter-balance valves according to an embodiment of the invention are used, namely a first counter-balance valve 11a and a second counter-balance valve 11 b. The first oil ports P of the first and

second balance valves

11a and 11b are both communicated with the outlet of the hydraulic pump 10, and the third oil ports T of the first and

second balance valves

11a and 11b are both connected with the oil tank. The fourth oil port B of the first balance valve 11a is connected with the rod cavity of the hydraulic cylinder 9, the second oil port a of the first balance valve 11a is connected with the rodless cavity of the hydraulic cylinder 9 after passing through the check valve 12a, the fourth oil port B of the second balance valve 11B is connected with the rodless cavity of the hydraulic cylinder 9, and the second oil port a of the second balance valve 11B is connected with the rod cavity of the hydraulic cylinder 9 after passing through the check valve 12B. When the hydraulic cylinder 9 needs to be controlled to extend, the proportional electromagnet 8 of the first balance valve 11a is electrified, and the extending speed of the hydraulic cylinder 9 is faster as the voltage applied to the first balance valve 11a is larger. When it is desired to control the retraction of the hydraulic cylinder 9, the proportional electromagnet 5 of the second counter-balance valve 11b is energized, the greater the voltage of the second counter-balance valve 11b given, the faster the retraction speed of the hydraulic cylinder 9. When the hydraulic cylinder 9 needs to be controlled to be locked, the first balance valve 11a and the second balance valve 11B are both de-energized, the rodless cavity of the hydraulic cylinder 9 is in a cut-off non-leakage state under the linear sealing of the check valve 12a and the fourth oil port B of the second balance valve 11B, and the rod cavity of the hydraulic cylinder 9 is in a cut-off non-leakage state under the linear sealing of the check valve 12B and the fourth oil port B of the first balance valve 11 a.

The balance valve has the advantages that:

1. the displacement of the reversing valve core and the displacement of the control valve core can be simultaneously controlled through the proportional electromagnet, the displacement of the control valve core enables a pressure difference to be generated between the fourth oil port B and the first control cavity, the pressure difference pushes the balance valve core to be opened, the opening and the reversing of the balance valve can be controlled only by a small electromagnet force, the electromagnet is low in power consumption, the large energy is not consumed in the prior art, and the energy-saving effect is achieved.

2. By adopting the hydraulic balance circuit, a hydraulic control proportional multi-way valve and a pilot handle do not need to be configured in the prior art, the hydraulic circuit is simplified, and the overall cost is reduced.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the embodiments without departing from the scope of the present invention.

Claims

1. A balanced valve, comprising:

the reversing valve core is arranged in the first mounting hole in a vertically sliding manner and comprises a first sliding section, a first reducing section, a second sliding section and a second reducing section from top to bottom, the second reducing section extends downwards into the upper section of the through hole of the balance valve core and abuts against the reducing section of the control valve core, a first throttling groove used for communicating the first oil port and the second oil port is formed in the second sliding section, and a communication flow passage communicated with the third oil port and the upper end face of the first sliding section is formed in the reversing valve core;

2. The balanced valve of claim 1, wherein the first throttling groove is a plurality of rectangular grooves evenly distributed along the circumference of the diverter spool.

3. The balance valve of claim 1, wherein the second restriction groove is a plurality of rectangular grooves evenly distributed along a circumference of the second shoulder of the balance valve spool.