CN201874908U - Special valve for air-conditioner of engineering machinery - Google Patents
Special valve for air-conditioner of engineering machinery Download PDFInfo
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- CN201874908U CN201874908U CN2010202923297U CN201020292329U CN201874908U CN 201874908 U CN201874908 U CN 201874908U CN 2010202923297 U CN2010202923297 U CN 2010202923297U CN 201020292329 U CN201020292329 U CN 201020292329U CN 201874908 U CN201874908 U CN 201874908U
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Abstract
The utility model mainly relates to a special valve for an air-conditioner of engineering machinery. The special valve is a flow-control valve compensating pressure for a throttle valve through an overflow valve which keeps pressure constant. The special valve comprises a valve body, an overflow valve, a throttle valve and a safety valve. A valve body is provided with an oil inlet P1, an oil outlet P2 and an oil return port T1. The overflow valve has a balancing chamber, a pressure chamber and an overflow chamber, wherein the pressure chamber communicates with the oil inlet P1 and the inlet of the throttle valve, the overflow chamber communicates with the oil return port T1, the outlet of the throttle valve communicates with the oil outlet P2 of the valve body, the inlet of the safety valve communicates with the balancing chamber, and the outlet communicates with the oil return port T1. The special valve enables the pressure of an air-conditioning hydraulic system vary with load. Besides, the special valve is low in production cost, compact in overall structure, small in occupation space and suitable for use on engineering machinery.
Description
Technical field
The utility model relates to a kind of engineering auto air-con, especially relates to a kind of engineering machinery air-conditioning special valve.
Background technique
The air-conditioning of engineering machinery, its compressor is many by fluid motor-driven, and the hydraulic power of oil hydraulic motor adopts the hydraulic system of engineering machinery main frame; When preventing to guarantee main frame rotary motor proper functioning, utilize the power more than needed on the main frame to make air-conditioning work realize refrigeration again, there is the inventor to disclose " hydraulic-oil quantity distribution system for engineering vehicle hydraulic power air-conditioner " (patent No.: patented technology ZL 200710020159.X) by name, this system comprises the main frame oil hydraulic pump, series flow control valve, the air-conditioning motor, coupling, air condition compressor, rotary buffering valve, rotary motor, fuel tank also comprises the pro rate valve, and the filler opening of pro rate valve links with the oil hydraulic pump that the air-conditioning system main frame is housed, oil outlet divides two-way: leading up to hydraulic pipe line and series flow control valve is connected with rotary motor, and another road is connected with the air-conditioning motor by hydraulic pipe line and rotary buffering valve.The scheme of this employing pro rate valve, the allocation proportion of the hydraulic oil that may command is come out from oil hydraulic pump, and make it send into series flow control valve and rotary buffering valve to hydraulic oil respectively in proportion, but cost is higher.
Summary of the invention
The utility model main purpose provides a kind of engineering machinery air-conditioning special valve, and it makes the air-conditioning hydraulic system pressure change with the variation of load for by the relief valve that plays the level pressure effect throttle valve is carried out pressure compensated flow control valve, and fabricating cost is lower; In addition, compact overall structure, it is little to take up room, and is suitable for the use of engineering machinery.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of engineering machinery air-conditioning special valve, comprise valve body, relief valve, throttle valve and safety valve, described valve body is provided with filler opening, oil outlet and return opening, described relief valve has counter balance pocket, pressure chamber, spill cavity, this pressure chamber is communicated in the filler opening of valve body and the inlet of throttle valve, and this spill cavity is communicated in the return opening of valve body; The outlet of described throttle valve is communicated in the oil outlet of valve body; The import of described safety valve is communicated in counter balance pocket, outlet is communicated in the valve body return opening.According to the overflow throttle valve principle, from the pressure oil of oil hydraulic pump, a part enters the air-conditioning oil hydraulic motor through throttle valve, and another part then flows back to fuel tank through relief valve; The outlet pressure of input pressure, throttle valve acts on relief valve pressure chamber and counter balance pocket respectively, pressure reduction is the pressure reduction of relief valve pressure chamber and counter balance pocket before and after the throttle orifice, makes relief valve spool be in a certain equilibrium position under the effect of hydraulic action, spring force and steady-state fluid force.
For the ease of control,, be provided with selector valve and corresponding runner between the outlet of described counter balance pocket and throttle valve, to constitute the oil circuit of changeable break-make as preferably.Pressure by selector valve control relief valve counter balance pocket.
For the valve of integrated form, comparatively traditional mode is that selector valve is installed on the integrated valve valve body, but this structure, oil duct is complicated, and increases technology difficulty, so easily increase manufacture cost; As preferably, described selector valve is arranged on the safety valve valve body; The valve body of safety valve is provided with oil inlet passage and oil discharge passage, this oil inlet passage one end is communicated in the selector valve filler opening, the other end is communicated in the throttle valve outlet by the corresponding runner that is provided with on the valve body, and this oil discharge passage is communicated to an oil outlet of selector valve the oil suction chamber of reduction valve.Compared to the structure that is installed in the integrated valve valve body, selector valve is installed on the safety valve, both be convenient to install, be convenient to process oil duct again, can reduce difficulty of processing, valve volume can reduce simultaneously, has also correspondingly reduced manufacture cost.
Liquid flow impact can make the balance of relief valve counter balance pocket and pressure chamber change; For avoiding liquid flow impact, as preferably, described oil discharge passage is provided with the damping screw.
Because the space on the engineering machinery is limited, therefore need to reduce overall volume; As preferably, described counter balance pocket connects valve body; Described safety valve is sealedly connected on the valve body, and envelope hide the outlet of counter balance pocket, be provided with boss corresponding to the safety valve sidewall of counter balance pocket, this boss stretches in the counter balance pocket.This structure, safety valve can be used as an end cap of relief valve, have simplified overall structure.
As preferably, described boss is provided with the oil inlet hole for the safety valve oil-feed, and this oil inlet hole is communicated in counter balance pocket and is provided with the damping screw at an end of counter balance pocket.The structure of oil inlet hole shortens the runner between safety valve and the counter balance pocket.
Therefore, the utlity model has rational in infrastructure, be easy to characteristics such as making, especially have following beneficial effect:
1, this valve can make system pressure change with the variation of load, and power loss is little, and system's heating value reduces, and is a kind of energy-saving element;
2, this valve flow of entering executive component is not subjected to the influence of load variations;
3, this valve flow of entering executive component is not acted upon by temperature changes;
4, this valve relief valve partly adopts the structure of proportional velocity regulating valve, and through-current capability is strong, and the overflow noise is little;
5, the spring rate in this valve internal pressure compensation device is bigger, and contamination resistance is strong, has increased functional reliability greatly;
6, low cost of manufacture;
7, compact structure, overall volume is little, is suitable for using on the engineering machinery.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of a kind of engineering machinery air-conditioning of the utility model special valve;
Accompanying drawing 2 is C-C sectional views of accompanying drawing 1;
Accompanying drawing 3 is left views of accompanying drawing 2;
Accompanying drawing 4 is mounting structure schematic representation of selector valve and safety valve;
Accompanying drawing 5 is a kind of structural representations of spool;
Accompanying drawing 6 is a kind of structural representations of valve pocket.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of engineering machinery air-conditioning of the utility model special valve, shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, accompanying drawing 5, accompanying drawing 6, it comprises valve body 5, relief valve 34, throttle valve 33, selector valve 32 and safety valve 31.
Valve body 5 is provided with oil inlet P 1, oil outlet P3 and oil return inlet T 1;
Relief valve comprises spool 3, pressure spring 4 and valve pocket 2; Spool 3 is stepped; Valve body 5 is provided with the valve pocket adaptive with spool 3, and spool 3 maximum diameter sections 302 are divided into counter balance pocket 311 and pressure chamber 312 with this valve pocket, and pressure chamber 312 is communicated with oil inlet P 1, the oil outlet P3 of valve body 5; Spool 3 centers are provided with the ladder-type through hole, establish pressure spring 4, small bore end in the big nose end of this through hole and radially are provided with spill port 306, and this spill port 306 communicates with spill cavity 313, and 4 pairs of spools 3 of pressure spring apply the active force that points to pressure chamber 312 directions; The spool 3 that is in pressure chamber 312 sides is made of first shaft part 303, second shaft part 304, and first shaft part, 303 diameters are greater than second shaft part 304; Be arranged with valve pocket 2 on second shaft part 304, valve pocket 2 is fixed on the valve body 5, and the end center that valve pocket 2 closes on first shaft part 303 is provided with counterbore 204, and the diameter of this counterbore 204 is less than first shaft part 303, greater than second shaft part 304; Space between counterbore 204 and second shaft part, 304 outer peripheral surfaces forms spill cavity 313, and spill cavity 313 communicates with oil return inlet T 1 on the valve body 5; Valve pocket 2 is provided with internal conical surface 206, and spool 3 first shaft parts 303 and 304 of second shaft parts are provided with the conical surface 309 adaptive with internal conical surface 206; When spool 3 in pressure spring 4 and fluid power effect lower slider, make first shaft part 303 gradually near or during away from valve pocket 2, the flow area that first shaft part 303 and valve pocket are 2 is also corresponding to diminish or becomes big.
The valve pocket of throttle valve 33 is located in the valve body 5, and throttle valve 33 comprises spring seat 14, flow spool 15, Flow valve spring 16, Flow valve spring seat 17, plunger 18 and adjusts screw 27.
Working principle is as follows: from the pressure oil of oil hydraulic pump, its pressure is p1, and a part enters executive component through throttle valve, i.e. air-conditioning oil hydraulic motor, and another part then flows back to fuel tank through relief valve.The outlet pressure of throttle valve is p2, p1 and p2 act on the right-hand member and the left end of relief valve spool again respectively, pressure reduction (p1-p2) is the pressure reduction at relief valve spool two ends before and after the throttle orifice, and relief valve spool is in a certain equilibrium position under the effect of hydraulic action, spring force and steady-state fluid force.When the executive component load increases, the outlet pressure p2 of overflow throttle valve increases, so acting on the hydraulic coupling of overflow throttle valve spool left end increases, spool is moved to right, and flow-off reduces, and spillage drag increases, cause oil hydraulic pump outlet pressure P1 to increase, the hydraulic coupling that promptly acts on the relief valve spool right-hand member increases thereupon, and the relief valve spool two ends are stressed to restore balance thereby make, and pressure reduction (p1-p2) remains unchanged substantially before and after the throttle orifice.In like manner, when load reduced, promptly p2 reduced, and spool moves to left, and flow-off increases, and pressure p 1 is reduced, and pressure reduction (p1-p2) also remains unchanged substantially.Therefore, no matter how the executive component load changes, because the pressure compensation effect of the relief valve in parallel with throttle valve, the pressure reduction before and after the throttle valve can both be bordering on constant, promptly the flow that enters element by overflow throttle valve can keep stable, and is not subjected to the influence of load variations.
Equally based on above-mentioned pressure reduction feedback principle, when the system oil temperature changed, the pressure reduction before and after the throttle valve also can be bordering on constant, and promptly the flow that enters executive component by the relief valve throttle valve can keep stable, and the influence that not changed by the oil temperature.
In the throttle grverning system that is made up of overflow throttle valve, oil hydraulic pump is not to work under the constant voltage, and its outlet pressure p1 changes with the variation of executive component load.In order to prevent system overload, this valve has set up safety valve again and overflow throttle valve fits together, and when system overload, safety valve is opened, and p2 is reduced, and relief valve spool moves to left, and flow-off increases, from all excessive oil sump tank of the fluid of oil hydraulic pump.
Claims (10)
1. engineering machinery air-conditioning special valve, comprise valve body (5), relief valve (34), throttle valve (33) and safety valve (31), described valve body (5) is provided with oil inlet P 1, oil outlet P2 and oil return inlet T 1, it is characterized in that: described relief valve (34) has counter balance pocket (311), pressure chamber (312), spill cavity (313), this pressure chamber (312) is communicated in the oil inlet P 1 of valve body (5) and the inlet of throttle valve (33), and this spill cavity (313) is communicated in the oil return inlet T 1 of valve body (5); The outlet of described throttle valve (33) is communicated in the oil outlet P2 of valve body (5); The import of described safety valve (31) is communicated in counter balance pocket (311), outlet is communicated in oil return inlet T 1.
2. a kind of engineering machinery air-conditioning special valve according to claim 1 is characterized in that: be provided with selector valve (32) and corresponding runner between the outlet of described counter balance pocket (311) and throttle valve (33), to constitute the oil circuit of changeable break-make.
3. a kind of engineering machinery air-conditioning special valve according to claim 2 is characterized in that: described selector valve (32) is arranged on safety valve (31) valve body; The valve body of safety valve (31) is provided with oil inlet passage (804) and oil discharge passage (806), these oil inlet passage (804) one ends are communicated in selector valve (32) filler opening, the other end is gone up the corresponding runner that is provided with by valve body (5) and is communicated in throttle valve (33) outlet, and this oil discharge passage (806) is communicated to an oil outlet of selector valve (32) oil suction chamber of reduction valve (31).
4. a kind of engineering machinery air-conditioning special valve according to claim 3, it is characterized in that: described oil discharge passage (806) is provided with damping screw (19).
5. according to claim 1 or 2 or 3 or 4 described a kind of engineering machinery air-conditioning special valves, it is characterized in that: described relief valve (34) comprises spool (3), pressure spring (4) and is sheathed on valve pocket (2) on the spool (3); Described valve body (5) is provided with and the adaptive valve pocket of spool (3), and spool (3) is divided into counter balance pocket (311) and pressure chamber (312) with this valve pocket, and pressure chamber (312) is communicated with oil inlet P 1, the oil outlet P3 of valve body (5); Described pressure spring (4) is located at counter balance pocket (311) one sides, spool (3) is applied the active force that points to pressure chamber (312) direction; Described valve pocket (2) be fixed on that valve body (5) is gone up and with spool (3) between form the spill cavity (313) that can communicate with pressure chamber (312), valve pocket (2) is provided with internal conical surface (206), and spool (3) is provided with the conical surface (309) adaptive with this internal conical surface (206); When the effect lower slider of spool (3) at pressure spring (4) and fluid power, make spool (3) gradually near or during away from valve pocket (2), the flow area that flows into spill cavity (313) from pressure chamber (312) correspondingly diminishes or becomes big.
6. a kind of engineering machinery air-conditioning special valve according to claim 5, it is characterized in that: described spool (3) center is provided with the ladder-type through hole, establish pressure spring (4) in the big nose end of this through hole, small bore end radially is provided with spill port (306), this spill port (306) communicates with spill cavity (313).
7. according to claim 1 or 2 or 3 or 4 described a kind of engineering machinery air-conditioning special valves, it is characterized in that: described counter balance pocket (311) connects valve body (5); Described safety valve (31) be sealedly connected on valve body (5) go up, and envelope hide the outlet of counter balance pocket (311), be provided with boss (801) corresponding to safety valve (31) sidewall of counter balance pocket (311), this boss (801) stretches in the counter balance pocket (311).
8. a kind of engineering machinery air-conditioning special valve according to claim 5 is characterized in that: described counter balance pocket (311) connects valve body (5); Described safety valve (31) be sealedly connected on valve body (5) go up, and envelope hide the outlet of counter balance pocket (311), be provided with boss (801) corresponding to safety valve (31) sidewall of counter balance pocket (311), this boss (801) stretches in the counter balance pocket (311).
9. a kind of engineering machinery air-conditioning special valve according to claim 8, it is characterized in that: described boss (801) is provided with the oil inlet hole (803) for safety valve (31) oil-feed, and this oil inlet hole (803) is communicated in counter balance pocket (311) and is provided with damping screw (12) at an end of counter balance pocket (311).
10. according to claim 1 or 2 or 3 or 4 described a kind of engineering machinery air-conditioning special valves, it is characterized in that: described safety valve (31) comprises safety valve valve body (6), safety valve valve seat (11), safety valve spool (10), safety valve spring (9) and plunger (8), this valve body (6) is provided with the oil outlet (805) as safety valve (31) outlet, and this oil outlet (805) is gone up the corresponding runner that is provided with by valve body (5) and is communicated in oil return inlet T 1; The valve pocket of described throttle valve (33) is located in the valve body (5), and throttle valve (33) comprises spring seat (14), flow spool (15), Flow valve spring (16), Flow valve spring seat (17), plunger (18) and adjusts screw (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202923297U CN201874908U (en) | 2010-08-16 | 2010-08-16 | Special valve for air-conditioner of engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202923297U CN201874908U (en) | 2010-08-16 | 2010-08-16 | Special valve for air-conditioner of engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201874908U true CN201874908U (en) | 2011-06-22 |
Family
ID=44162826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202923297U Expired - Lifetime CN201874908U (en) | 2010-08-16 | 2010-08-16 | Special valve for air-conditioner of engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201874908U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511376A (en) * | 2012-06-19 | 2014-01-15 | 上海立新液压有限公司 | High-frequency-response proportional direction valve |
| CN107795279A (en) * | 2017-12-06 | 2018-03-13 | 徐工集团工程机械有限公司 | Trepan and engineering truck |
| CN112145494A (en) * | 2020-10-09 | 2020-12-29 | 山东大学 | Ultrahigh-pressure overflow valve driven by servo motor and working method thereof |
-
2010
- 2010-08-16 CN CN2010202923297U patent/CN201874908U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511376A (en) * | 2012-06-19 | 2014-01-15 | 上海立新液压有限公司 | High-frequency-response proportional direction valve |
| CN107795279A (en) * | 2017-12-06 | 2018-03-13 | 徐工集团工程机械有限公司 | Trepan and engineering truck |
| CN112145494A (en) * | 2020-10-09 | 2020-12-29 | 山东大学 | Ultrahigh-pressure overflow valve driven by servo motor and working method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |