CN218489425U

CN218489425U - Heating system for cab of working machine and working machine with same

Info

Publication number: CN218489425U
Application number: CN202222622685.6U
Authority: CN
Inventors: 周文昌; 高华; 张会文; 李秀堂
Original assignee: Caterpillar Qingzhou Ltd
Current assignee: Caterpillar Qingzhou Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-02-17
Anticipated expiration: 2032-09-30

Abstract

The utility model relates to a system of warming up for operation machine driver's cabin, system of warming up includes medium circulation circuit, and medium circulation circuit is including the circulating pump that is used for the pumping medium, be used for the PTC medium heating device to flow through medium heating wherein and utilize the heating that the heat that comes from PTC medium heating device's medium heated core, a serial communication port, medium circulation circuit includes in the upper reaches of PTC medium heating device and the heating of warm core the medium flows in order to take away the thermal motor cooling medium circulation room of motor wherein, is provided with the bypass branch road between the medium input of motor cooling medium circulation room and medium output, system of warming up is including being used for controlling the valve part of the medium flow of bypass branch road and the branch road that motor cooling medium circulation room is located. The utility model discloses still relate to and have the operation machinery of system warms up.

Description

Heating system for cab of working machine and working machine with same

Technical Field

The utility model relates to a warm system of system and have of system is warmed up to work machine for operation machine driver's cabin.

Background

At present, a heating system is arranged on the operation machine to adjust the temperature in a cab. In cold winter, a PTC (Positive Temperature Coefficient) heating device works to heat a circulating medium, the heated medium heats airflow through a heating warm core, and warm air with the Temperature increased is introduced into a cab. Due to the large power and high energy consumption of the PTC heating device, a large amount of electric quantity can be consumed when the heating system works; and the heat generated by the motor and/or the motor controller in the working process of the working machine is not fully and reasonably utilized, so that the energy is wasted.

Accordingly, the present invention is directed to one or more improvements in the prior art.

SUMMERY OF THE UTILITY MODEL

The defect to prior art, the utility model provides an improve technique that is used for the system that heats of operation machinery driver's cabin, should improve the energy consumption that the technique made the system that heats and reduce, improve operation machinery's energy-conserving effect and ensure the high-efficient operation of motor.

According to an aspect of the present invention, there is provided a heating system for a cab of a work machine, the heating system including a medium circulation circuit including a circulation pump for pumping a medium, a PTC medium heating device for heating the medium flowing therethrough, and a heating core for heating by heat of the medium from the PTC medium heating device, characterized in that the medium circulation circuit includes a motor cooling medium circulation chamber in which the medium flows to take away motor heat upstream of the PTC medium heating device and downstream of the heating core, a bypass branch is provided between a medium input end and a medium output end of the motor cooling medium circulation chamber, the heating system including a valve member for controlling medium flow rates of a branch in which the bypass branch and the motor cooling medium circulation chamber are located.

According to the utility model discloses, combine refrigerating system with motor cooling medium circulation system for can adopt a heat transfer medium to come the heat that recycle motor or the relevant part of motor produced, obtain energy-conserving effect, reduce manufacturing cost and running cost, and make and to obtain reliable and nimble temperature control.

Advantageously, the motor cooling medium circulation chamber is provided with a first temperature sensor for measuring the temperature of the medium in the motor cooling medium circulation chamber.

Advantageously, the heating warm core is provided with a second temperature sensor for measuring the temperature of the medium in the heating warm core.

Advantageously, the heating system comprises a controller in communicative connection with the first temperature sensor, the second temperature sensor and the valve member.

Advantageously, the controller is in communication with the PTC medium heating device. Therefore, the power consumption of the PTC medium heating device can be flexibly controlled, the power consumption is reduced, and the energy-saving effect is achieved.

Advantageously, the valve element comprises a first shut-off valve arranged in the bypass branch and/or a second shut-off valve arranged in the branch of the motor coolant circulation chamber. Therefore, the medium circulation loop can be flexibly switched between the motor-free heat-assisted heating loop and the motor-based heat-assisted heating loop.

Advantageously, the valve member comprises a shunt three-way valve, the input of the bypass branch and the medium input of the motor cooling medium circulation chamber being connected to the medium circulation circuit by being connected to two outlets of the shunt three-way valve, respectively; and/or the valve member includes a confluence three-way valve, and an output end of the bypass branch and a medium output end of the motor cooling medium circulation chamber are connected to the medium circulation circuit by being respectively connected to two inlets of the confluence three-way valve. Thus, in addition to enabling flexible switching of the medium circulation circuit between the motor-less and motor-assisted heating circuits, the regulation and distribution of the flow rate can be precisely controlled according to the specific heating preset temperature and the heat generation amount associated with the motor.

Advantageously, the circulation pump is located upstream of the PTC medium heating device, and the motor cooling medium circulation chamber is provided between the heating warm core and the circulation pump. Through this configuration, it is ensured that the medium circulates in the circulation circuit at a certain flow rate, improving the thermal efficiency of the entire heating system.

According to another aspect of the present invention, there is provided a working machine including the above-described heating system.

Through the utility model discloses a system warms up for can utilize the heat that motor or machine controller produced in a flexible way effectively, reach the energy-conserving technological effect of whole system that warms up, and ensure the high-efficient operation of motor.

Drawings

Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram of a heating system for a cab of a work machine according to the present disclosure.

Reference numerals are as follows:

10-a heating system; 105-a bypass branch;

100-a medium circulation loop; 105 i-input;

101-a circulating pump; 105 o-output;

102-PTC medium heating device; a V-valve member;

103-heating the warm core; 106-first stop valve;

103 i-media input; 107-second stop valve;

104-a motor cooling medium circulation chamber; s1, a shunt three-way valve;

104 i-media input; s2, a converging three-way valve;

104 o-media output; t1-a first temperature sensor;

HVAC-primary loop line; t2-second temperature sensor.

The figures are purely diagrammatic and not drawn to scale, and moreover they show only those parts which are necessary for the elucidation of the invention, other parts being omitted or merely mentioned. That is, the present invention may include other components in addition to those shown in the drawings.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it is to be understood that the invention is not to be limited to the specific embodiments described. Rather, any combination of the following features and elements, whether related to different embodiments or not, is contemplated to implement the present invention.

Fig. 1 shows a schematic diagram of a heating system 10 for a cab of a work machine according to the present disclosure. The heating system 10 comprises a medium circulation circuit 100, the medium circulation circuit 100 comprising a circulation pump 101 for pumping a medium, a PTC medium heating device 102 for heating the medium flowing therethrough, a heating warm core 103 for heating with heat of the medium from the PTC medium heating device. Referring to fig. 1, a circulation pump 101, a PTC medium heating device 102, and a heating warm core 103 are arranged in series on a basic circuit line HVAC of a medium circulation circuit 100. The heating core 103 may be implemented as a heat exchanger of which a medium flowing in a fluid passage is heat-exchanged with air flowing through the heat exchanger via a fan, and then the air having the temperature increased is sent to the cabin to perform heating. In the illustrated embodiment, the media circulation loop 100 includes a motor cooling media circulation chamber 104 disposed upstream of the PTC media heating device 102. The medium flowing in the motor cooling medium circulation chamber 104 carries away heat generated by the motor or the motor-related components by heat transfer, and the medium flowing out from the motor cooling medium circulation chamber 104 may flow into the primary circuit line HVAC. Preferably, the circulation pump 101 is located upstream of the PTC medium heating device 102, and the motor cooling medium circulation chamber 104 is provided upstream of the circulation pump 101 and downstream of the heating warm core 103, as shown in the drawing.

According to the present invention, a bypass branch 105 is provided between the medium input 104i and the medium output 104o of the motor cooling medium circulation chamber 104. The bypass branch 105 and the branch in which the motor cooling medium circulation chamber 104 is located can be regarded as a branch in parallel with the basic circuit line HVAC.

The heating system 10 comprises a valve member V for controlling/regulating the medium flow of the bypass branch 105 and the branch of the motor cooling medium circulation chamber 104. The valve member V comprises a first shut-off valve 106 arranged in the bypass branch 105 and/or a second shut-off valve 107 arranged in the branch in which the motor cooling medium circulation chamber is located.

In the illustrated embodiment, the valve member V includes a branching three-way valve S1 and a joining three-way valve S2, an input terminal 105i of the bypass branch and a medium input terminal 104i of the motor cooling medium circulation chamber are connected into the medium circulation circuit by being connected to two outlets of the branching three-way valve S1, respectively (an inlet of the branching three-way valve S1 is connected to an output terminal of the basic circuit line HVAC), and an output terminal 105o of the bypass branch and a medium output terminal 104o of the motor cooling medium circulation chamber are connected into the medium circulation circuit by being connected to two inlets of the joining three-way valve S2, respectively (an outlet of the joining three-way valve S2 is connected to an input terminal of the basic circuit line HVAC).

In this context, the medium circulating through the medium circuit 100 is a heat transfer medium that can be used to transfer heat generated by the motor, as well as to heat the PTC medium heating device. For example, water may be selected as the heat transfer medium.

Referring to fig. 1, an input terminal 105i of the bypass branch 105 and a medium input terminal 104i of the motor cooling medium circulation chamber 104 are connected to an output terminal of a basic circuit line HVAC of the medium circulation circuit through a branching three-way valve S1. The three-way bypass valve S1 has, for example, a first or a second valve position: in the first valve position, the medium from the heating warm core 103 flows into the branch of the motor cooling medium circulation chamber 104, and the bypass branch 105 is not in HVAC fluid communication with the primary loop line, thereby forming a motor heat auxiliary heating loop; in the second valve position, the medium from the heating core 103 flows into the bypass branch 105, and the branch in which the motor cooling medium circulation chamber 104 is located is not in HVAC fluid communication with the primary circuit line, thereby forming a motorless heat assisted warming circuit. By means of switching between the first valve position and the second valve position of the shunt three-way valve S1, a heating loop can be flexibly selected according to the actual operation condition or the actual heating requirement of the operation machine, and the operation of the PTC medium heating device 102 is flexibly controlled, so that the heat management efficiency of the whole operation machine is effectively improved, and the energy-saving effect is achieved.

The output 105o of the bypass branch 105 and the medium output 104o of the motor cooling medium circulation chamber 104 are connected to the input of the basic circuit line HVAC of the medium circulation circuit through a confluence three-way valve S2. The merging three-way valve S2 at the output end of the bypass branch 105 may be used in cooperation with the diverging three-way valve S1 at the input end of the bypass branch 105. When the flow-dividing three-way valve S1 at the input end of the bypass branch is in the first valve position, the converging three-way valve S2 at the output end of the bypass branch is in the corresponding valve position, so that the medium circulation loop can be switched to a closed motor heat-assisted heating loop, i.e., the medium flows through the motor cooling medium circulation chamber 104, the basic loop pipeline HVAC (i.e., the circulation pump, the PTC medium heating device and the heating warm core), and then returns to the motor cooling medium circulation chamber 104, and the circulation is repeated. Similarly, when the shunt three-way valve S1 at the bypass branch input is in the second valve position, the merge three-way valve S2 at the bypass branch output is in the corresponding valve position, enabling switching of the medium circulation circuit to a closed motor-less heat-assisted heating circuit, i.e. the medium bypasses the motor cooling medium circulation chamber 104, takes over to the bypass branch 105, enters the basic circuit line HVAC (i.e. circulation pump, PTC medium heating device and heating warm core), and then returns to the bypass branch 105, thus repeating the cycle.

Although the drawing shows that the flow-dividing three-way valve S1 and the flow-merging three-way valve S2 are provided. The merging three-way valve S2 may be used alone without using the branching three-way valve S1. Alternatively, the flow-dividing three-way valve S1 is used without using the confluence three-way valve S2.

The medium flow of the bypass branch and the branch in which the motor coolant circulation chamber is located can also be adjusted by means of the three-way valve, instead of only completely opening or blocking the medium flow as described above. It is also possible to omit the provision of the three-way valve and use only the first cut-off valve 106 provided on the bypass branch 105 and the second cut-off valve 107 provided on the branch where the motor cooling medium circulation chamber is located.

In the illustrated advantageous embodiment, the medium output 104o of the motor cooling medium circulation chamber 104 is provided with a first temperature sensor T1 for measuring the temperature of the medium from the motor cooling medium circulation chamber 104. Although the first temperature sensor T1 is shown as being disposed at the medium output end 104o of the motor cooling medium circulation chamber 104, it is understood that the first temperature sensor T1 may be disposed in the motor cooling medium circulation chamber 104 or in another region, as long as the temperature (thermal energy state, i.e., availability) of the motor cooling medium can be estimated from the temperature measurement value thereof. Advantageously, the medium input 103i of the heating warm core 103 is provided with a second temperature sensor T2 for measuring the temperature of the medium flowing into the heating warm core 103. The second temperature sensor T2 may be disposed in other areas related to the heating core as long as the temperature (thermal energy state) of the medium in the heating core can be estimated from the temperature measurement value thereof.

The heating system 10 according to the present invention includes a controller (not shown) that is in communication connection with the first temperature sensor T1, the second temperature sensor T2, and the valve member V, thereby controlling the valve member V based on the measurement values of the first temperature sensor T1 and the second temperature sensor T2. The controller may also control the first cut-off valve 106 on the bypass branch 105 and/or the second cut-off valve 107 on the branch on which the motor cooling medium circulation chamber is located, in accordance with the operating state of the branching three-way valve S1 and/or the joining three-way valve S2.

Advantageously, the controller is in communicative connection with the PTC medium heating device 102, thereby enabling control of the energization or de-energization of the PTC medium heating device 102 based on the measured values of the first temperature sensor T1 and the second temperature sensor T2. When the PTC medium heating device is energized (i.e., in an operating state), the PTC medium heating device heats the medium flowing therethrough, and when the PTC medium heating device is de-energized (in an off state), the medium simply flows therethrough and is not heated.

According to the utility model discloses, can ensure to adopt the operation of the warm return circuit of the system of adaptation and nimble control PTC medium heating device according to the heating demand of the operating mode of motor cooling medium circulation room and driver's cabin side in a flexible way. When the motor heat-assisted heating loop is adopted, the heat in the motor cooling system is utilized to the heating system of the cab, so that the waste of the heat in the motor cooling system is avoided, the continuous high-energy-consumption work of the PTC medium heating device is avoided, the energy conservation of the whole heating system is realized, and in addition, the motor benefits from effective cooling to obtain high working efficiency.

In addition, because the motor cooling medium circulating system is combined into the whole heating system, heat can be transferred/utilized by means of the circulating flow of a heat transfer medium, the whole heating system only needs to prepare an expansion water tank, and a circulating pump and a heating core are adopted, so that the operation requirement can be met, the design of the system is greatly simplified, and the manufacturing cost and the operation cost of the whole system are reduced.

In addition, through flexible, accurate and timely control, the situation that high-temperature media in a basic loop pipeline HVAC reversely heat the motor can be effectively avoided, and safe and reliable operation of the motor is ensured.

Industrial applicability

In order to better understand the present invention, the heating system shown in fig. 1 is taken as an example to illustrate the specific working principle of the present invention.

According to the present invention, the controller of the heating system 10 sends the control command to the three-way flow dividing valve S1 according to the analysis comparison result of the measured values of the first temperature sensor T1 for measuring the temperature of the medium from the motor cooling medium circulation chamber 104 and the second temperature sensor T2 for measuring the temperature of the medium flowing into the heating core 103.

When the temperature of the medium flowing out of the motor cooling medium circulation chamber 104 is much higher than the temperature of the medium flowing into the heating warm core 103 (i.e., the heat of the motor cooling medium is available), the second cut-off valve 107 is controlled to be opened, the first cut-off valve 106 is controlled to be closed, or the shunt three-way valve S1, for example, is controlled to be in the first valve position without the cut-off valve, that is, the heat in the motor cooling medium is transferred or transferred to the cab through heat exchange by using the motor heat-assisted heating circuit, and the heating is assisted by using the heat of the motor cooling medium. At this time, the PTC medium heating device may be in a turned-off state.

When the temperature of the medium flowing out from the motor cooling medium circulation chamber 104 is higher than the temperature of the medium flowing into the heating warm core 103 but is not high enough for the cab heating preset temperature (i.e., the heat in the motor cooling medium is available but not enough to meet the cab heating requirement), the second cut-off valve 107 is controlled to be opened, the first cut-off valve 106 is controlled to be closed, or, for example, the shunt three-way valve S1 is controlled to be in the first valve position in a case where no cut-off valve is provided, the medium flowing out from the motor cooling medium circulation chamber 104 flows into the basic circuit line HVAC, and the PTC medium heating device 102 is turned on while the heat in the motor cooling medium and the PTC medium heating device are used to heat the cab to meet the cab heating requirement.

When the temperature of the medium flowing out from the motor cooling medium circulation chamber 104 is lower than the temperature of the medium flowing into the heating warm core 103 (i.e., the heat of the motor cooling medium is too low to be used), the second cut-off valve 107 is controlled to be closed, the first cut-off valve 106 is controlled to be opened, or, for example, the three-way bypass valve S1 is controlled to be in the second valve position without the cut-off valve, and the bypass branch 105 is in fluid communication with the basic circuit line HVAC, that is, a motor-less heat-assisted warming circuit is formed, at which time, the supply air for the cab is heated only by the operation of the PTC medium heating device 102.

Therefore, according to the present invention, it is possible to selectively use the two heating methods of the heat in the motor cooling medium and the electric heating of the PTC medium heating device 102 to heat the cab. Through the flexible and accurate control of the controller, the PTC medium heating device 102 is prevented from being in a working state all the time, heat of the motor cooling medium circulating system is effectively utilized for heating a cab, the energy-saving effect is achieved while the requirement for heating the cab is met, the working efficiency of the motor is improved, lower manufacturing cost and operation cost are obtained, and safety and reliability are improved.

According to the utility model discloses a heating system can be used to the heating of work machine such as bull-dozer and ventilation air conditioning system realizes expected driver's cabin temperature control.

While the foregoing illustrative embodiments have been described in detail for purposes of clarity and completeness, it will be understood by those skilled in the art that various other embodiments may be devised by modifying the disclosed technology without departing from the spirit and scope of the invention. These embodiments should be understood to fall within the scope of the present invention as determined based on the claims and any equivalents thereof.

Claims

1. A heating system for a cab of a work machine, the heating system comprising a medium circulation circuit including a circulation pump for pumping a medium, a PTC medium heating device for heating the medium flowing therethrough, and a heating core for heating with heat of the medium from the PTC medium heating device, characterized in that the medium circulation circuit includes a motor cooling medium circulation chamber in which the medium flows to take away motor heat, upstream of the PTC medium heating device and downstream of the heating core, a bypass branch being provided between a medium input and a medium output of the motor cooling medium circulation chamber, the heating system including a valve member for controlling medium flow rates of the bypass branch and a branch in which the motor cooling medium circulation chamber is located.

2. Heating system as claimed in claim 1, characterized in that the motor cooling medium circulation chamber is provided with a first temperature sensor for measuring the temperature of the medium in the motor cooling medium circulation chamber.

3. Heating system according to claim 2, characterized in that the heating warm core is provided with a second temperature sensor for measuring the temperature of the medium in the heating warm core.

4. A heating system as recited in claim 3, including a controller communicatively connected with said first temperature sensor, said second temperature sensor, and said valve member.

5. Heating system according to claim 4, characterized in that the controller is in communication connection with a PTC medium heating device.

6. Heating system according to one of claims 1-5, wherein the valve means comprise a first shut-off valve arranged in the bypass branch and/or a second shut-off valve arranged in the branch in which the motor cooling medium circulation chamber is located.

7. A heating system as claimed in any one of claims 1-5, characterized in that the valve member comprises a shunt three-way valve, and that the input of the bypass branch and the medium input of the motor cooling medium circulation chamber are connected to the medium circulation circuit by being connected to two outlets of the shunt three-way valve, respectively; and/or the valve member includes a confluence three-way valve, and an output end of the bypass branch and a medium output end of the motor cooling medium circulation chamber are connected to the medium circulation circuit by being respectively connected to two inlets of the confluence three-way valve.

8. A heating system according to any of claims 1-5, wherein a circulation pump is located upstream of the PTC medium heating device, and the motor cooling medium circulation chamber is provided downstream of the heating warm core and upstream of the circulation pump.

9. A work machine, characterized in that the work machine comprises a heating system according to one of claims 1-8.