CN210484227U - Overflow type air conditioning valve for engineering machinery - Google Patents
Overflow type air conditioning valve for engineering machinery Download PDFInfo
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- CN210484227U CN210484227U CN201920919405.3U CN201920919405U CN210484227U CN 210484227 U CN210484227 U CN 210484227U CN 201920919405 U CN201920919405 U CN 201920919405U CN 210484227 U CN210484227 U CN 210484227U
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Abstract
The utility model relates to an excessive formula engineering machine tool air conditioning valve, include: the valve body, overflow valve, choke valve, relief valve, the overflow valve include: the pressure spring is arranged in the valve body and sleeved on the valve core; an overflow cavity which can be communicated with the pressure cavity is formed between the valve sleeve and the valve core; the small end of the stepped through hole is communicated with an oil return port T3; the overflow cavity is communicated with an oil return port T1 of the valve body; the pressure cavity is respectively communicated with an inlet of the throttle valve, an oil inlet P1 and an oil outlet P3; the inlet of the safety valve is communicated with the balance cavity, and the outlet of the safety valve is communicated with the oil return port T1; the inlet of the safety valve is communicated with the balance cavity, and the outlet of the safety valve is communicated with the oil return port T1. The overflow type air conditioning valve for the engineering machinery is beneficial to not generating interference when being used with other hydraulic execution elements at the same time.
Description
Technical Field
The utility model belongs to the technical field of the air conditioner for the machineshop car and specifically relates to an excessive formula engineering machine tool air conditioning valve.
Background
With the development of engineering machinery manufacturing technology and the improvement of living standard of people, people pursue the environment in the engineering machinery cab more and more, therefore, the air conditioning system capable of improving the comfort level of users also shows more and more important position; the utility model discloses a patent number ZL201020292329.7 utility model discloses a special valve for an engineering machinery air conditioner, which is a flow control valve for pressure compensation of a throttle valve by an overflow valve with a constant pressure function, and comprises a valve body, the overflow valve, a throttle valve and a safety valve, wherein the valve body is provided with an oil inlet P1, an oil outlet P2 and an oil return port T1; the overflow valve comprises a valve core, a pressure spring and a valve sleeve; the valve core is in a step shape; the valve body is provided with a valve cavity matched with the valve core, the valve cavity is divided into a balance cavity and a pressure cavity by the maximum diameter section of the valve core, and the pressure cavity is communicated with an oil inlet P1 and an oil outlet P3 of the valve body; the center of the valve core is provided with a step-shaped through hole, a pressure spring is arranged in the big hole end of the through hole, and an oil return hole communicated with the overflow cavity is radially arranged at the small hole end; the overflow valve oil return mode of the traditional special valve for the engineering mechanical air conditioner is an overflow type in which an oil return hole is communicated with an overflow cavity, the overflow type has the defects that leakage oil is communicated with a first oil return port T1 and an oil return port T2 of a valve body, and the interference is easy to generate when the overflow valve is used with other hydraulic execution elements at the same time, so that the overflow type engineering mechanical air conditioner valve which is beneficial to using the other hydraulic execution elements at the same time without interference is designed, and the problem to be solved urgently is solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the overflow valve oil return mode of present engineering machine tool air conditioner special valve and for the communicating interior formula of spilling of oil gallery and overflow chamber, there are first oil return opening T1 and oil return opening T2 intercommunication of letting out leakage oil and valve body, be unfavorable for using simultaneously easily to produce the not enough of interfering with other hydraulic actuator, provide one kind and do benefit to and do not produce the excessive formula engineering machine tool air conditioner valve of interfering with other hydraulic actuator simultaneous use.
The utility model discloses a concrete technical scheme is:
an overflow type air conditioning valve for engineering machinery, comprising: be equipped with overflow valve chamber, oil inlet P1, first oil-out P2, first oil return mouth T1 and third oil return mouth T3's valve body, overflow valve, choke valve, relief valve, the overflow valve include: the pressure spring is arranged in the valve body and sleeved on the valve core; an overflow cavity which can be communicated with the pressure cavity is formed between the valve sleeve and the valve core; the small end of the stepped through hole is communicated with a third oil return port T3; the overflow cavity is communicated with a first oil return port T1 of the valve body; the pressure cavity is respectively communicated with an inlet of the throttle valve, an oil inlet P1 and a second oil outlet P3; the inlet of the safety valve is communicated with the balance cavity, and the outlet of the safety valve is communicated with the first oil return port T1; the inlet of the safety valve is communicated with the balance cavity, and the outlet of the safety valve is communicated with the first oil return port T1.
According to the overflow throttling valve principle, one part of pressure oil from a hydraulic pump enters an air conditioner hydraulic motor through a throttling valve, and the other part of pressure oil flows back to an oil tank through an overflow valve; the oil inlet pressure and the outlet pressure of the throttle valve are respectively acted on an overflow valve pressure cavity and a balance cavity, and the front-back pressure difference of the throttle valve port is the pressure difference of the overflow valve pressure cavity and the balance cavity, so that the valve core of the overflow valve is in a certain balance position under the action of hydraulic acting force, spring force and steady-state hydraulic force; the small end of the stepped through hole of the overflow valve of the overflow type engineering mechanical air conditioning valve is communicated with the third oil return port T3, so that the defects of the special valve for the overflow type engineering mechanical air conditioning valve are overcome, the leaked oil cannot be communicated with the first oil return port T1 and the oil return port T2 of the valve body, and the interference is avoided when the special valve is used with other hydraulic actuating elements at the same time.
Preferably, the valve sleeve is provided with an inner conical surface, and the valve core is provided with an outer conical surface matched with the inner conical surface; when the valve core slides under the action of the pressure spring and the hydraulic force, the outer conical surface is gradually close to or far away from the inner conical surface, and the flow area flowing into the overflow cavity from the pressure cavity is correspondingly reduced or enlarged.
Preferably, the overflow type air conditioning valve for construction machinery further comprises: a diverter valve; the reversing valve is arranged on the safety valve body; an oil inlet channel and an oil outlet channel are arranged on a valve body of the safety valve, one end of the oil inlet channel is communicated with an oil inlet of the reversing valve, the other end of the oil inlet channel is communicated with an outlet of the throttle valve through a flow channel correspondingly arranged on the valve body, and one oil outlet of the reversing valve is communicated with an oil inlet cavity of the pressure reducing valve through the oil outlet channel; and a damping screw is arranged on the oil outlet channel. The pressure of the overflow valve balance cavity is controlled by the reversing valve; for the valve in an integrated form, the reversing valve is installed on the valve body of the integrated valve in a traditional mode, but the structure has a complex oil passage and increases the process difficulty, so that the manufacturing cost is easily increased; compared with the structure of the integrated valve body, the reversing valve is arranged on the safety valve, so that the installation is convenient, the oil duct processing is convenient, the processing difficulty can be reduced, the volume of the valve body can be reduced, and the manufacturing cost is correspondingly reduced; the oil outlet channel is provided with a damping screw, so that the balance of the overflow valve balance cavity and the pressure cavity can be prevented from changing when liquid flow impacts.
Preferably, the balance cavity penetrates through the valve body; the safety valve is connected to the valve body in a sealing mode and covers the outlet of the balance cavity in a sealing mode, a boss is arranged on the side wall of the safety valve corresponding to the balance cavity, and the boss extends into the balance cavity. Because the space on the engineering machinery is limited, the whole volume needs to be reduced, and the safety valve can be used as an end cover of the overflow valve in the structure, so that the whole structure is simplified.
Preferably, the boss is provided with an oil inlet hole for oil inlet of the safety valve, the oil inlet hole is communicated with the balance cavity, and one end of the balance cavity is provided with a damping screw. The liquid flow impact can change the balance of the overflow valve balance cavity and the pressure cavity; in order to avoid the impact of the liquid flow,
preferably, the safety valve comprises a safety valve body, a safety valve seat, a safety valve spool (10), a safety valve spring and a plunger, wherein the valve body is provided with an oil outlet serving as a safety valve outlet, and the oil outlet is communicated with the first oil return port T1 through a flow passage correspondingly arranged on the valve body; the valve cavity of the throttle valve is arranged in the valve body, and the throttle valve comprises a spring seat, a flow valve core, a flow valve spring seat, a plunger and an adjusting screw.
Compared with the prior art, the beneficial effects of the utility model are that: the small end of the stepped through hole of the overflow valve of the overflow type engineering mechanical air conditioning valve is communicated with the third oil return port T3, so that the defects of the special valve for the overflow type engineering mechanical air conditioning are overcome, the leaked oil cannot be communicated with the first oil return port T1 and the oil return port T2 of the valve body, and the interference between the leaked oil and other hydraulic execution elements is avoided when the valve is used simultaneously; the valve can lead the pressure of the system to change along with the change of the load, has small power loss and reduced heat productivity of the system, and is an energy-saving element; the flow rate of the valve entering the actuating element is not influenced by load change; the flow rate of the valve entering the actuating element is not influenced by temperature change; the overflow valve part of the valve adopts a structure of a proportional speed regulating valve, and has strong through-flow capacity and small overflow noise.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a top view of FIG. 1;
FIG. 5 is a cross-sectional view B-B of FIG. 4;
fig. 6 is a hydraulic schematic diagram of the present invention.
In the figure, an end cover 1, a valve housing 2, a counter bore 204, an inner conical surface 206, a valve core 3, a safety valve 31, a reversing valve 32, a throttle valve 33, an overflow valve 34, a stepped through hole 35, a maximum diameter section 302, a first shaft section 303, a second shaft section 304, an outer conical surface 309, a balance cavity 311, a pressure cavity 312, an overflow cavity 313, a pressure spring 4, a valve body 5, a safety valve body 6, a plunger 8, a boss 801, an oil inlet hole 803, an oil inlet channel 804, an oil outlet hole 805, an oil outlet channel 806, a safety valve spring 9, a safety valve core 10, a safety valve seat 11, a damping screw 12, a spring seat 14, a flow valve core 15, a flow valve spring 16, a flow valve spring seat 17, a plunger 18, a reversing valve damping screw 19, an adjusting screw 27, an oil inlet P1, a first oil outlet P2, a second oil outlet P3, a first oil return T1.
Detailed Description
The invention will be further described with reference to the drawings.
As shown in figures 1 to 6: an overflow type air conditioning valve for engineering machinery comprises a valve body 5, an overflow valve 34, a throttle valve 33, a reversing valve 32 and a safety valve 31; the valve body 5 is provided with an oil inlet P1, a second oil outlet P3, a first oil return port T1 and a third oil return port T3.
The overflow valve 34 has a balance cavity 311, a pressure cavity 312, and an overflow cavity 313, the pressure cavity 312 is communicated with the oil inlet P1 of the valve body 5 and the inlet of the throttle valve 33, the overflow cavity 313 is communicated with the first oil return port T1 of the valve body 5; the outlet of the throttle valve 33 is communicated with a first oil outlet P2 of the valve body 5; the inlet of the relief valve 31 is connected to the balance chamber 311, and the outlet thereof is connected to the first oil return port T1. A reversing valve 32 and a corresponding flow passage are arranged between the balance cavity 311 and the outlet of the throttle valve 33 to form an oil path capable of switching on and off.
The overflow valve comprises a valve core 3, a pressure spring 4 and a valve sleeve 2; the valve core 3 is in a step shape; the valve body 5 is provided with a valve cavity matched with the valve core 3, the valve cavity is divided into a balance cavity 311 and a pressure cavity 312 by the maximum diameter section 302 of the valve core 3, and the pressure cavity 312 is communicated with an oil inlet P1 and a second oil outlet P3 of the valve body 5; a stepped through hole 35 is formed in the center of the valve core 3, a pressure spring 4 is arranged in the large hole end of the stepped through hole 35, the small hole end is communicated with a third oil return port T3, and the pressure spring 4 applies acting force pointing to the direction of the pressure cavity 312 to the valve core 3; the valve core 3 on the pressure chamber 312 side is composed of a first shaft section 303 and a second shaft section 304, wherein the diameter of the first shaft section 303 is larger than that of the second shaft section 304; the second shaft section 304 is sleeved with a valve sleeve 2, the valve sleeve 2 is fixed on the valve body 5, a counter bore 204 is arranged in the center of one end, close to the first shaft section 303, of the valve sleeve 2, and the diameter of the counter bore 204 is smaller than that of the first shaft section 303 and larger than that of the second shaft section 304; an overflow cavity 313 is formed in a space between the counter bore 204 and the outer circumferential surface of the second shaft section 304, and the overflow cavity 313 is communicated with a first oil return port T1 on the valve body 5; an inner conical surface 206 is arranged on the valve sleeve 2, and an outer conical surface 309 matched with the inner conical surface 206 is arranged between the first shaft section 303 and the second shaft section 304 of the valve core 3; when the spool 3 slides under the action of the pressure spring 4 and hydraulic force to make the first shaft section 303 gradually approach or move away from the valve housing 2, the flow area between the first shaft section 303 and the valve housing 2 is correspondingly reduced or increased.
One end of the balance cavity 311 is provided with an end cover 1, and the other end of the balance cavity penetrates through the valve body 5; the safety valve 31 is hermetically connected to the valve body 5 and seals the outlet of the balance cavity 311, and a boss 801 is arranged on the side wall of the safety valve 31 corresponding to the balance cavity 311, and the boss 801 extends into the balance cavity 311. The boss 801 is provided with an oil inlet 803 for the oil inlet of the safety valve 31, the oil inlet 803 is communicated with the balance cavity 311, and one end of the balance cavity 311 is provided with a damping screw 12.
The relief valve 31 includes a relief valve body 6, a relief valve seat 11, a relief valve spool 10, a relief valve spring 9, and a plunger 8, the relief valve body 6 is provided with an oil outlet hole 805 as an outlet of the relief valve 31, and the oil outlet hole 805 is communicated with a third oil return port T3 through a flow passage correspondingly provided in the valve body 5.
The reversing valve 32 is arranged on the valve body of the safety valve 31; an oil inlet channel 804 and an oil outlet channel 806 are arranged on the valve body of the safety valve 31, one end of the oil inlet channel 804 is communicated with an oil inlet of the reversing valve 32, the other end of the oil inlet channel is communicated with an outlet of the throttle valve 33 through a flow channel correspondingly arranged on the valve body 5, and an oil outlet of the reversing valve 32 is communicated with an oil inlet cavity of the pressure reducing valve 31 through the oil outlet channel 806. The oil outlet channel 806 is provided with a reversing valve damping screw 19.
The valve cavity of the throttle valve 33 is arranged in the valve body 5, and the throttle valve 33 comprises a spring seat 14, a flow valve spool 15, a flow valve spring 16, a flow valve spring seat 17, a plunger 18 and an adjusting screw 27.
The working principle is as follows: the pressure oil from the hydraulic pump, the pressure of which is p1, partly enters the actuator, i.e. the air conditioning hydraulic motor, through the throttle valve, and partly flows back to the oil tank through the overflow valve. The outlet pressure of the throttle valve is p2, p1 and p2 act on the right end and the left end of the relief valve core respectively, the front-back differential pressure (p 1-p 2) of the throttle valve is the differential pressure at the two ends of the relief valve core, and the relief valve core is in a certain balance position under the action of hydraulic acting force, spring force and steady-state hydraulic force; when the load of the actuator is increased, the outlet pressure P2 of the overflow throttle valve is increased, so that the hydraulic pressure acting on the left end of the valve core of the overflow throttle valve is increased, the valve core moves to the right, the overflow port is reduced, the overflow resistance is increased, the outlet pressure P1 of the hydraulic pump is increased, namely the hydraulic pressure acting on the right end of the valve core of the overflow valve is increased, the two ends of the valve core of the overflow valve are stressed and restored to balance, and the front-back differential pressure (P1-P2) of the throttle valve is basically kept unchanged. Similarly, when the load is reduced, namely p2 is reduced, the valve core moves leftwards, the overflow port is increased, the pressure p1 is reduced, and the differential pressure (p 1-p 2) is also basically kept unchanged. Therefore, regardless of the load variation of the actuator, the pressure difference across the throttle valve can be made nearly constant due to the pressure compensation effect of the relief valve connected in parallel with the throttle valve, i.e., the flow entering the element through the relief throttle valve can be kept stable without being affected by the load variation.
Based on the pressure difference feedback principle, when the oil temperature of the system changes, the pressure difference between the front and the rear of the throttle valve can be approximately constant, namely the flow entering the actuating element through the overflow valve throttle valve can be kept stable and is not influenced by the oil temperature change.
In a throttle governor system consisting of an overflow throttle, the hydraulic pump is not operated at constant pressure, and its outlet pressure p1 varies with the change in the actuator load. In order to prevent the system from overloading, the valve is additionally provided with a safety valve which is assembled with an overflow throttle valve, when the system is overloaded, the safety valve is opened to lower p2, a valve core of the overflow valve moves leftwards, an overflow port is enlarged, and all oil from the hydraulic pump overflows back to the oil tank.
In addition to the above embodiments, the technical features or technical data of the present invention can be selected and combined again within the scope disclosed in the claims and the specification of the present invention to constitute new embodiments, which can be realized by those skilled in the art without creative efforts, and therefore, the embodiments of the present invention not described in detail should be regarded as specific embodiments of the present invention and within the protection scope of the present invention.
Claims (6)
1. An overflow type air conditioning valve for engineering machinery, comprising: be equipped with overflow valve chamber, oil inlet (P1), first oil-out (P2), second oil-out (P3), first oil return mouth (T1), second oil return mouth (T2) and third oil return mouth (T3) the valve body, the overflow valve, the choke valve, the relief valve, characterized by, the overflow valve include: the pressure spring is arranged in the valve body and sleeved on the valve core; an overflow cavity which can be communicated with the pressure cavity is formed between the valve sleeve and the valve core; the small end of the stepped through hole is communicated with a third oil return port (T3); the overflow cavity is communicated with a first oil return port (T1) of the valve body; the pressure cavity is respectively communicated with an inlet of the throttle valve, an oil inlet (P1) and a second oil outlet (P3); the inlet of the safety valve is communicated with the balance cavity, and the outlet of the safety valve is communicated with the first oil return port (T1).
2. The overflow type air conditioning valve for engineering machinery as claimed in claim 1, wherein the valve sleeve is provided with an inner conical surface, and the valve core is provided with an outer conical surface adapted to the inner conical surface; when the valve core slides under the action of the pressure spring and the hydraulic force, the outer conical surface is gradually close to or far away from the inner conical surface, and the flow area flowing into the overflow cavity from the pressure cavity is correspondingly reduced or enlarged.
3. The overflow type air conditioning valve for construction machinery as claimed in claim 1, further comprising: a diverter valve; the reversing valve is arranged on the safety valve body; an oil inlet channel and an oil outlet channel are arranged on a valve body of the safety valve, one end of the oil inlet channel is communicated with an oil inlet of the reversing valve, the other end of the oil inlet channel is communicated with an outlet of the throttle valve through a flow channel correspondingly arranged on the valve body, and one oil outlet of the reversing valve is communicated with an oil inlet cavity of the pressure reducing valve through the oil outlet channel; and a damping screw is arranged on the oil outlet channel.
4. The overflow type air conditioning valve for engineering machinery as claimed in claim 1, 2 or 3, wherein the balance cavity penetrates through the valve body; the safety valve is connected to the valve body in a sealing mode and covers the outlet of the balance cavity in a sealing mode, a boss is arranged on the side wall of the safety valve corresponding to the balance cavity, and the boss extends into the balance cavity.
5. The overflow type air conditioning valve for engineering machinery as claimed in claim 4, wherein the boss is provided with an oil inlet hole for oil inlet of the safety valve, the oil inlet hole is communicated with the balance chamber, and one end of the balance chamber is provided with a damping screw.
6. The overflow type air conditioning valve for engineering machinery as claimed in claim 1, 2 or 3, wherein the safety valve comprises a safety valve body, a safety valve seat, a safety valve core, a safety valve spring and a plunger, the valve body is provided with an oil outlet as an outlet of the safety valve, and the oil outlet is communicated with the first oil return port (T1) through a flow passage correspondingly arranged on the valve body; the valve cavity of the throttle valve is arranged in the valve body, and the throttle valve comprises a spring seat, a flow valve core, a flow valve spring seat, a plunger and an adjusting screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920919405.3U CN210484227U (en) | 2019-06-18 | 2019-06-18 | Overflow type air conditioning valve for engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920919405.3U CN210484227U (en) | 2019-06-18 | 2019-06-18 | Overflow type air conditioning valve for engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN210484227U true CN210484227U (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920919405.3U Active CN210484227U (en) | 2019-06-18 | 2019-06-18 | Overflow type air conditioning valve for engineering machinery |
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| CN (1) | CN210484227U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483498A (en) * | 2020-11-30 | 2021-03-12 | 杭州精工液压机电制造有限公司 | Engineering machinery air conditioner control valve with proportional throttle valve and control method |
-
2019
- 2019-06-18 CN CN201920919405.3U patent/CN210484227U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483498A (en) * | 2020-11-30 | 2021-03-12 | 杭州精工液压机电制造有限公司 | Engineering machinery air conditioner control valve with proportional throttle valve and control method |
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