CN105114400B - Closed type hydraulic system and its control method with preheating function - Google Patents
Closed type hydraulic system and its control method with preheating function Download PDFInfo
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- CN105114400B CN105114400B CN201510536908.9A CN201510536908A CN105114400B CN 105114400 B CN105114400 B CN 105114400B CN 201510536908 A CN201510536908 A CN 201510536908A CN 105114400 B CN105114400 B CN 105114400B
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Abstract
The invention discloses a kind of closed type hydraulic system and its control method for having and preheating function, the closed type hydraulic system includes enclosed main oil pump assembly and executive component, pressure shut-off valve is provided with enclosed main oil pump assembly, wherein, closed type hydraulic system is additionally provided with the preheating circuit between two hydraulic fluid ports for being connected to enclosed main oil pump assembly, overflow valve is provided with the preheating circuit, the oil inlet of the overflow valve is connected with the first hydraulic fluid port in two hydraulic fluid ports, the second hydraulic fluid port unilaterally connected in overfall and two hydraulic fluid ports, in normal conditions, overflow valve keeps cut-off, enter without influenceing hydraulic system normal work, under warm-up operations, the Opening pressure of overflow valve is less than the Opening pressure of pressure shut-off valve, when the pressure of the first hydraulic fluid port is more than the Opening pressure of overflow valve, overflow valve is opened, the pressure oil liquid of first hydraulic fluid port flows back to the second hydraulic fluid port by overfall, and then realize that overflow is heated.
Description
Technical field
The present invention relates to hydraulic system field, in particular it relates to a kind of closed type hydraulic system with preheating function and its
Control method.
Background technology
Equipment with hydraulic system starts before normal work in the relatively low environment of temperature, it is necessary to first add to hydraulic oil
Heat to after uniform temperature, i.e. first hydraulic oil is preheated, equipment ability normal work, otherwise, when hydraulic pump at the beginning
When just being worked under delivery, high rotating speed, hydraulic pump can be caused to be emptied and damage hydraulic pump.Existing hydraulic oil preheating method has
Two kinds：One is to heat hydraulic oil by electrically heated mode, and another is preheating certainly for hydraulic system, i.e. oil pump is relatively low
Discharge capacity under work, overflow valve be in overflow situation, hydraulic oil is heated by overflow heating.When oil temperature rises to target temperature
When, it is automatic to close preheating function.
At present, the hydraulic oil that open type pumping system allows oil pump to export due to carrying overflow valve, during preheating passes through overflow valve overflow,
The purpose of heating hydraulic oil can be achieved.
But for there was only pressure shut-off valve, for the enclosed pumping system of overflow valve, it is impossible to realize preheating function,
Therefore, it can only make it that main oil pump works under extremely low discharge capacity, hydraulic oil, extreme influence are slowly heated by the motion of hydraulic oil
The operating efficiency of closed type hydraulic system is arrived.
The content of the invention
It is an object of the present invention to provide a kind of closed type hydraulic system for having and preheating function, the hydraulic system can be real
The preheating function of existing hydraulic oil.
It is a further object to provide a kind of Closed Hydraulic system with preheating function for controlling the present invention to provide
The control method of system.
There is provided a kind of closed type hydraulic system for having and preheating function, the hydraulic system bag according to an aspect of the present invention
The executive component for including enclosed main oil pump assembly and being connected between two hydraulic fluid ports of the enclosed main oil pump assembly, the main oil of enclosed
Pressure shut-off valve is provided with pump assembly, wherein, the closed type hydraulic system is additionally provided with that to be connected to the enclosed main oil pump total
Into two hydraulic fluid ports between preheating circuit, be provided with overflow valve on the preheating circuit, the oil inlet of the overflow valve and described two
The first hydraulic fluid port connection in individual hydraulic fluid port, the overfall of the overflow valve and the second hydraulic fluid port unilaterally connected in described two hydraulic fluid ports,
In normal conditions, the overflow valve keeps cut-off or Opening pressure to be more than the unlatching pressure of the pressure shut-off valve
Power,
Under warm-up operations, the Opening pressure of the overflow valve is less than the Opening pressure of the pressure shut-off valve, when described
When the pressure of first hydraulic fluid port is more than the Opening pressure of the overflow valve, the overflow valve is opened, the pressure oil of first hydraulic fluid port
Liquid flows back to second hydraulic fluid port by the overfall.
Preferably, check valve is additionally provided with the preheating circuit, the check valve is located under the overfall of the overflow valve
Trip, and allow the pressure oil liquid away from the overflow valve flow.
Preferably, the overflow valve is pilot-type relief valve, and the remote control mouthful of the pilot-type relief valve is optional by reversal valve
Connected with first hydraulic fluid port or fuel tank of the enclosed main oil pump assembly with selecting, the reversal valve has the first working position and the
Two working positions, in first working position, the remote control mouthful is connected with first hydraulic fluid port, in second working position, described
Remote control mouthful is connected with the fuel tank,
Under the nominal situation, the reversal valve is in first working position, to pass through the pressure of first hydraulic fluid port
Power fluid controls the pilot-type relief valve to keep cut-off,
Under the warm-up operations, the reversal valve is in second working position, to cause the remote control mouthful off-load.
Preferably, the reversal valve is electromagnetism two position three way directional control valve.
Preferably, the overflow valve is the electric proportional pressure control valve with controllable Opening pressure, in the nominal situation, control
The Opening pressure of the electric proportional pressure control valve is more than the Opening pressure of the pressure shut-off valve, in the warm-up operations, controls institute
The Opening pressure for stating electric proportional pressure control valve is less than the Opening pressure of the pressure shut-off valve.
Preferably, the executive component is two-way hydraulic cylinder, two oil pockets of the two-way hydraulic cylinder respectively with the enclosed
Two hydraulic fluid ports connection of main oil pump assembly.
According to another aspect of the present invention there is provided a kind of control method for the closed type hydraulic system for having and preheating function,
When entering the warm-up operations, the enclosed main oil pump assembly is controlled not commutate.
By above-mentioned technical proposal, in normal conditions, it is described that the overflow valve keeps cut-off or Opening pressure to be more than
The Opening pressure of pressure shut-off valve, i.e. ensure that overflow valve does not work, so, does not interfere with the normal of hydraulic system and uses,
Under warm-up operations, control enclosed main oil pump assembly not commutate by the control method, hydraulic system can be realized
Build the pressure so that the pressure of first hydraulic fluid port be more than the overflow valve Opening pressure, now state overflow valve open,
The pressure oil liquid of first hydraulic fluid port flows back to second hydraulic fluid port by the overfall, i.e. realized by the overflow of overflow valve
The purpose of heated pressure fluid, so as to protect main oil pump, prevents it to be emptied impaired, furthermore it is also possible to improve closed type hydraulic system
Operating efficiency.
Other features and advantages of the present invention will be described in detail in subsequent embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute a part for specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is that the closed type hydraulic system with preheating function of the first preferred embodiment offer of the present invention is in advance
Theory diagram under thermal condition；
Fig. 2 is the principle of the closed type hydraulic system with preheating function of second of preferred embodiment offer of the present invention
Block diagram；
Fig. 3 is that the closed type hydraulic system with preheating function of the first preferred embodiment offer of the present invention is in just
Theory diagram under normal operating mode.
Description of reference numerals
The preheating circuit of 10 20 executive component of enclosed main oil pump assembly 30
The reversal valve of 31 overflow valve, 32 check valve 33
A the first hydraulic fluid port the second hydraulic fluid ports of B
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
In the present invention, in the case where not making opposite explanation, the noun of locality used such as " upstream, downstream " is typically relative
For the flow direction of pressure oil liquid, i.e. towards the flow direction of pressure oil liquid be downstream, away from the flowing of pressure oil liquid
Direction is upstream.
As shown in Figure 1 to Figure 3, the present invention provides a kind of closed type hydraulic system for having and preheating function, the hydraulic system bag
The executive component 20 for including enclosed main oil pump assembly 10 and being connected between two hydraulic fluid ports of the enclosed main oil pump assembly 10, enclosed master
Pressure shut-off valve is provided with oil pump assy 10, wherein, closed type hydraulic system, which is additionally provided with, is connected to enclosed main oil pump assembly 10
Two hydraulic fluid ports between preheating circuit 30, be provided with overflow valve 31 on the preheating circuit 30, the oil inlet of the overflow valve 31 with
The second hydraulic fluid port B unilaterally connecteds in the first hydraulic fluid port A connections in two hydraulic fluid ports, the overfall of the overflow valve 31 and two hydraulic fluid ports,
In normal conditions, overflow valve 31 keeps cut-off or Opening pressure to be more than the Opening pressure of pressure shut-off valve, i.e.
Ensure that overflow valve does not work, so, do not interfere with the normal of hydraulic system and use；
Under warm-up operations, the Opening pressure of overflow valve 31 is less than the Opening pressure of pressure shut-off valve, when the first hydraulic fluid port A's
When pressure is more than the Opening pressure of overflow valve 31, overflow valve is opened, and the first hydraulic fluid port A pressure oil liquid flows back to second by overfall
Hydraulic fluid port B.That is, the purpose for heating hydraulic oil is realized by the overflow of overflow valve, so as to protect main oil pump, prevents it to be emptied impaired,
Furthermore it is also possible to improve the operating efficiency of closed type hydraulic system.
The unilaterally connected of the second hydraulic fluid port B in overfall and two hydraulic fluid ports for ease of realizing overflow valve 31, preheating circuit
Check valve 32 is additionally provided with 30, the check valve 32 is located at the overfall downstream of overflow valve 31, and allows pressure oil liquid remote
Overflow valve 31 flows.That is, check valve 32 can guarantee that from the first hydraulic fluid port A flow out pressure oil liquid flow through overflow valve 31 after flow to second
Hydraulic fluid port B, and when pressure oil liquid flows out from the second hydraulic fluid port B, check valve 32 is obstructed, pressure oil liquid will not be applied to overflow valve 31
On, and then reach the purpose of protection overflow valve 31.In other embodiments, in addition to check valve 32, it can also set controllable
Switch valve realizes the protection on overflow valve 31 and does not influence overflow valve to work.
As the first preferred embodiment of the present invention, overflow valve 31 is pilot-type relief valve, the pilot-type relief valve
Remote control mouthful selectively connected by reversal valve 33 with the first hydraulic fluid port A or fuel tank of enclosed main oil pump assembly 10, reversal valve 33
With the first working position and the second working position, in the first working position, remote control mouthful is connected with the first hydraulic fluid port A, in the second working position, distant
Control mouth is connected with fuel tank,
As shown in figure 3, in normal conditions, reversal valve 33 is in the first working position, to pass through the first hydraulic fluid port A pressure oil
Hydraulic control pilot-type relief valve keeps cut-off, specifically, and the remote control mouthful and oil inlet due to pilot-type relief valve remain company
Lead to, i.e. the upper cavity pressure of the main valve heart of pilot-type relief valve and lower cavity pressure are identical all the time, therefore spring force will can be led all the time
Valve core is pressed on valve seat, and valve port is closed.
Again as shown in figure 1, under warm-up operations, reversal valve 33 is in the second working position, to cause remote control mouthful off-load, specifically
Ground, the upper cavity pressure of the main valve heart of pilot-type relief valve is zero, and the main valve heart overcomes main spool spring power under the pressure effect of very little
Promote main valve to move in the heart, so as to open main valve valve port, realize the overflow of pilot-type relief valve, and then realize the pre- of pressure oil liquid
Heat.
For convenience of manipulation pilot-type relief valve remote control mouth selectively with the first hydraulic fluid port A of enclosed main oil pump assembly 10 or
Fuel tank is connected, as shown in figures 1 and 3, and reversal valve 33 is electromagnetism two position three way directional control valve.For example, when the commutation of electromagnetism two-position three way
When valve obtains electric, it is located at the first working position, and pilot-type relief valve is in cut-off state, when when electromagnetism two position three way directional control valve dead electricity
When, it is located at the second working position, and pilot-type relief valve is in overflow situation.In other embodiments, reversal valve 33 can be with
The reversal valve of above-mentioned reversing mode of the invention, the invention is not limited in this regard can be realized for three position four-way directional control valve etc. is various.
As second of preferred embodiment of the present invention, as shown in Fig. 2 overflow valve 31 is with controllable Opening pressure
Electric proportional pressure control valve, in nominal situation, the Opening pressure of the electric proportional pressure control valve of control is more than the Opening pressure of pressure shut-off valve, from
And ensure that the valve port of electric proportional pressure control valve is closed all the time, now pressure shut-off valve works, and does not interfere with the normal of hydraulic system
Work；In warm-up operations, the Opening pressure of the electric proportional pressure control valve of control is less than the Opening pressure of pressure shut-off valve, therefore, hydraulic pressure
The pressure of oil can first reach the Opening pressure of electric proportional pressure control valve first, and then open valve port, overflow heating.
As a kind of preferred embodiment, as shown in Figure 1 to Figure 3, executive component 20 is two-way hydraulic cylinder, the bidirectional hydraulic
Two oil pockets of cylinder are connected with two hydraulic fluid ports of enclosed main oil pump assembly 10 respectively.
A kind of control method of the closed type hydraulic system with preheating function is also claimed in the present invention, as the pre- thermal technology of entrance
During condition, control enclosed main oil pump assembly 10 does not commutate.By taking the first closed type hydraulic system with preheating function as an example, work as electromagnetism
During valve dead electricity, the main oil pump of control enclosed main oil pump assembly 10 works under some setting discharge capacity, and controls main oil pump from the
One hydraulic fluid port A is fuel-displaced, promotes executive component 20, such as oil cylinder, and action is to stroke end, as shown in figure 1, oil cylinder is to stroke end
Afterwards, main oil pump does not commutate, and main oil pump works on and output hydraulic pressure oil is so that system builds the pressure, when the first hydraulic fluid port A is above-mentioned to overflow
During the setting pressure of valve 31, overflow valve opens relief function, so as to realize the purpose of heated pressure fluid.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (5)
1. a kind of have the closed type hydraulic system for preheating function, the hydraulic system includes enclosed main oil pump assembly (10) and is connected to
Set in executive component (20) between two hydraulic fluid ports of the enclosed main oil pump assembly (10), the enclosed main oil pump assembly (10)
There is pressure shut-off valve, it is characterised in that the closed type hydraulic system, which is additionally provided with, is connected to the enclosed main oil pump assembly (10)
Two hydraulic fluid ports between preheating circuit (30), be provided with overflow valve (31) on the preheating circuit (30), the overflow valve (31)
Oil inlet is connected with the first hydraulic fluid port (A) in described two hydraulic fluid ports, overfall and the described two hydraulic fluid ports of the overflow valve (31)
In the second hydraulic fluid port (B) unilaterally connected,
In normal conditions, the overflow valve (31) keeps cut-off,
Under warm-up operations, the Opening pressure of the overflow valve (31) is less than the Opening pressure of the pressure shut-off valve, when described
When the pressure of first hydraulic fluid port (A) is more than the Opening pressure of the overflow valve (31), the overflow valve (31) is opened, first oil
The pressure oil liquid of mouth (A) flows back to second hydraulic fluid port (B) by the overfall, and the overflow valve (31) is type pilot overflow
Valve, the remote control mouthful of the pilot-type relief valve is selectively described with the enclosed main oil pump assembly (10) by reversal valve (33)
First hydraulic fluid port (A) or fuel tank connection, the reversal valve (33) have the first working position and the second working position, in the described first work
Position, the remote control mouthful is connected with first hydraulic fluid port (A), in second working position, and the remote control mouthful is connected with the fuel tank,
Under the nominal situation, the reversal valve (33) is in first working position, to pass through first hydraulic fluid port (A)
Pressure oil liquid controls the pilot-type relief valve to keep cut-off,
Under the warm-up operations, the reversal valve (33) is in second working position, to cause the remote control mouthful off-load.
2. according to claim 1 have the closed type hydraulic system for preheating function, it is characterised in that the preheating circuit
(30) check valve (32) is additionally provided with, the check valve (32) is located at the overfall downstream of the overflow valve (31), and allows
The pressure oil liquid flows away from the overflow valve (31).
3. according to claim 1 have the closed type hydraulic system for preheating function, it is characterised in that the reversal valve (33)
For electromagnetism two position three way directional control valve.
4. according to claim 1 have the closed type hydraulic system for preheating function, it is characterised in that the executive component
(20) it is two-way hydraulic cylinder, two hydraulic fluid ports of two oil pockets of the two-way hydraulic cylinder respectively with the enclosed main oil pump assembly (10)
Connection.
5. a kind of controlling party of the closed type hydraulic system with preheating function in 1-4 according to claim described in any one
Method, it is characterised in that when entering the warm-up operations, controls the enclosed main oil pump assembly (10) not commutate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510536908.9A CN105114400B (en) | 2015-08-27 | 2015-08-27 | Closed type hydraulic system and its control method with preheating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510536908.9A CN105114400B (en) | 2015-08-27 | 2015-08-27 | Closed type hydraulic system and its control method with preheating function |
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| Publication Number | Publication Date |
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| CN105114400A CN105114400A (en) | 2015-12-02 |
| CN105114400B true CN105114400B (en) | 2017-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510536908.9A Active CN105114400B (en) | 2015-08-27 | 2015-08-27 | Closed type hydraulic system and its control method with preheating function |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420383B (en) * | 2017-06-01 | 2019-05-17 | 武汉船用机械有限责任公司 | A kind of system and method controlling hydraulic fluid temperature |
| CN107288958B (en) * | 2017-08-22 | 2023-04-18 | 徐州徐工挖掘机械有限公司 | Pilot hydraulic preheating system and method for hydraulic excavator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102418725A (en) * | 2011-10-24 | 2012-04-18 | 中联重科股份有限公司 | Pumping equipment and distribution hydraulic system and heating method thereof |
| CN202628681U (en) * | 2011-12-07 | 2012-12-26 | 海天塑机集团有限公司 | Multi-component injection machine oil temperature preheating control circuit |
| CN203321949U (en) * | 2013-06-05 | 2013-12-04 | 中国石油天然气集团公司 | Top driving hydraulic oil remote microcirculation heating device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006012719A1 (en) * | 2005-03-18 | 2006-09-21 | Smc K.K. | actuator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102418725A (en) * | 2011-10-24 | 2012-04-18 | 中联重科股份有限公司 | Pumping equipment and distribution hydraulic system and heating method thereof |
| CN202628681U (en) * | 2011-12-07 | 2012-12-26 | 海天塑机集团有限公司 | Multi-component injection machine oil temperature preheating control circuit |
| CN203321949U (en) * | 2013-06-05 | 2013-12-04 | 中国石油天然气集团公司 | Top driving hydraulic oil remote microcirculation heating device |
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| CN105114400A (en) | 2015-12-02 |
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Address after: 102206, Beijing, Shahe, Changping District Town, Sha Yang Road, Lao Wan Village North Patentee after: Beiqi Futian Automobile Co., Ltd. Address before: 102206 Changping District City, Shahe, Sha Yang Road, Beijing Patentee before: Beiqi Futian Automobile Co., Ltd. |
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Effective date of registration: 20200927 Address after: No.202 Xuanfu street, Xuanhua District, Zhangjiakou, Hebei Province Patentee after: Hebei Leisa Heavy Construction Machinery Co., Ltd Address before: 102206, Beijing, Shahe, Changping District Town, Sha Yang Road, Lao Wan Village North Patentee before: BEIQI FOTON MOTOR Co.,Ltd. |
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| TR01 | Transfer of patent right |