Fan blowback control valve, fan blowback control system and agricultural machinery

Abstract

The utility model relates to hydraulic equipment, and provides a fan blowback control valve, a fan blowback control system and agricultural machinery. An oil return port; the first working oil port is used for being connected with a multi-way valve, and the first working oil port is connected with the oil inlet; the second working oil port is used for being connected with a fan blade angle control mechanism; the reversing valve (2) is used for selectively connecting the second working oil port with one of the oil inlet and the oil return port; and the pressure reducing valve (3) is arranged on an oil path between the reversing valve (2) and the oil inlet. According to the utility model, sundries and dust on the surface of the water tank can be timely and efficiently cleaned without manual participation and shutdown, so that the heat dissipation effect of an engine is ensured.

Description

Technical Field

[0001] The utility model relates to agricultural machinery, in particular to a fan back-blowing control valve, a fan back-blowing control system and agricultural machinery. Background Art

[0002] The cooling fan of traditional agricultural machinery in China is driven by the engine, and the fan draws air from the outside to the inside to dissipate heat from the water tank. However, due to the large amount of dust and debris at the operation site of agricultural machinery, the surface of the cooling water tank is easily covered with a large amount of debris and dust, which affects the cooling effect of the water tank.

[0003] The cleaning method of the prior art is manual cleaning, but this method requires stopping the machine for cleaning, which seriously affects the working efficiency. In addition, the manual cleaning is not timely and the cleaning is not thorough. There are still debris and dust on the surface of the radiator water tank that have not been cleaned up. When it is restarted later, it will still affect the heat dissipation performance, thereby causing the engine water tank to overheat and affecting the engine performance. Utility Model Content

[0004] The utility model provides a fan back-blowing control valve, a fan back-blowing control system and agricultural machinery, which can timely and efficiently clean the sundries and dust on the surface of the water tank without manual intervention and without stopping the machine, thereby ensuring the heat dissipation effect of the engine.

[0005] In order to solve the above technical problems, the utility model provides a fan back-blowing control valve in a first aspect, comprising:

[0006] Oil inlet;

[0007] Oil return port;

[0008] A first working oil port, the first working oil port is used to connect the multi-way valve, and the first working oil port is connected to the oil inlet;

[0009] a second working oil port, the second working oil port being used for connecting a fan blade angle control mechanism;

[0010] a reversing valve, the reversing valve being used to selectively connect the second working oil port to one of the oil inlet and the oil return port;

[0011] A pressure reducing valve is arranged on the oil path between the reversing valve and the oil inlet.

[0012] In some specific embodiments, the valve core of the reversing valve includes at least a first working position and a second working position.

[0013] When the valve core of the reversing valve is in the first working position, the second working oil port is connected to the oil return port through the reversing valve;

[0014] When the valve core of the reversing valve is in the second working position, the second working oil port is connected to the oil inlet through the reversing valve.

[0015] In some specific embodiments, the reversing valve is an electromagnetic reversing valve or an electric proportional reversing valve.

[0016] In some specific embodiments, a pressure sensor is further included, and the pressure sensor is arranged on the oil circuit between the second working oil port and the reversing valve.

[0017] In some specific embodiments, a controller is further included, which is electrically connected to the pressure sensor and the electromagnet of the reversing valve respectively, and the controller is configured to control the valve opening of the reversing valve according to the pressure signal of the pressure sensor.

[0018] In some specific embodiments, the pressure reducing valve is a pilot proportional pressure reducing valve.

[0019] In some specific embodiments, a temperature sensor and a controller are also included. The temperature sensor is used to detect the refrigerant temperature of the radiator. The controller is electrically connected to the temperature sensor and the electromagnet of the reversing valve respectively. The controller is configured to control the reversing frequency of the reversing valve according to the temperature signal of the temperature sensor.

[0020] In some specific embodiments, it also includes a first throttle hole and a second throttle hole, the first throttle hole is arranged in the oil circuit between the reversing valve and the second working oil port, and the second throttle hole is arranged in the oil circuit connecting the oil inlet to the first working oil port and the pressure reducing valve.

[0021] A second aspect of the utility model provides a fan back-blow control system, comprising the above-mentioned fan back-blow control valve.

[0022] A third aspect of the utility model provides an agricultural machine, comprising the above-mentioned fan back-blow control valve or the above-mentioned fan back-blow control system.

[0023] Through the above scheme, the beneficial effects of the utility model are as follows:

[0024] The utility model is provided with a reversing valve and a pressure reducing valve. When it is necessary to clean the debris and dust on the heat dissipation water tank, the second working oil port for connecting the fan blade angle control mechanism can be connected to the oil inlet through the reversing valve, so that the oil supply pressure can be reduced to the allowable working pressure of the fan blade angle control mechanism through the pressure reducing valve, and then delivered to the second working oil port, so as to adjust the angle of the fan and further control the fan backblowing for cleaning; after cleaning, the second working oil port is connected to the return oil port through the reversing valve, so that the blades of the heat dissipation fan return to the initial state, without manual intervention and without stopping the machine, the debris and dust on the surface of the water tank can be cleaned in time and efficiently, thereby ensuring the heat dissipation effect of the engine.

[0025] In addition, the oil inlet of the utility model is directly connected to the multi-way valve through the first working oil port, and no hydraulic valve is set on the oil circuit between the two, which reduces pressure loss, saves energy, and does not affect the operation of the multi-way valve during the fan backblowing operation.

[0026] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0028] Figure 1 This is a hydraulic principle diagram of a specific embodiment of the fan back-blow control valve of the utility model;

[0029] Figure 2 It is a control module diagram of a specific embodiment of the fan back-blowing control system of the utility model.

[0030] Description of Reference Numerals

[0031] 1First throttle hole 2Directional valve

[0032] 3 Pressure reducing valve 4 Second throttle hole

[0033] 5Pressure sensor 6Controller

[0034] 7 Temperature Sensor DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation modes described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the specific implementation modes described below.

[0036] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "formed", "provided with", "set", "connected" and the like should be understood in a broad sense. For example, the connection can be a direct connection or an indirect connection through an intermediate medium, a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate connection member, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, in the absence of corresponding explanations, the directions or positional relationships indicated by the directional words "up", "down", "left", "right", "counterclockwise", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only used to facilitate the description of the present utility model and simplify the description, rather than to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model; the directional terms of the present utility model should be understood in conjunction with the actual installation state.

[0038] The utility model provides a fan back-blowing control valve according to the first aspect. Figure 1 As a specific embodiment of the fan back-blowing control valve of the utility model, it includes an oil inlet P, an oil return port T, a first working oil port A, a second working oil port B, a reversing valve 2 and a pressure reducing valve 3. The second working oil port B is used to connect the fan blade angle control mechanism. Specifically, the fan blade angle control mechanism (shown in the figure) is a fan back-blowing hydraulic cylinder. The reversing valve 2 is used to selectively connect the second working oil port B to one of the oil inlet P and the oil return port T. When it is necessary to clean the dust on the water tank, the reversing valve 2 connects the second working oil port B to the oil inlet P. The pressure reducing valve 3 is arranged on the reversing valve. 2 and the oil inlet, therefore, the oil supply pressure of the oil inlet is reduced to the allowable working pressure of the fan back-blowing hydraulic cylinder by the pressure reducing valve 3, and then flows into the fan back-blowing hydraulic cylinder through the second working oil port B, thereby adjusting the angle of the fan to control the fan back-blowing for cleaning; after the cleaning is completed, the second working oil port B is connected to the return oil port T through the reversing valve 2, and the pressure oil of the fan back-blowing hydraulic cylinder is unloaded back to the return oil port T, so that the fan blades return to the initial state, without manual participation and without stopping the machine, the sundries and dust on the surface of the water tank can be cleaned in a timely and efficient manner to ensure the heat dissipation effect of the engine. In addition, the oil inlet P is directly connected to the multi-way valve through the first working oil port A, and no hydraulic valve is set between the first working oil port A and the oil inlet P, which reduces pressure loss and saves energy, and will not affect the operation of the multi-way valve during the fan back-blowing operation.

[0039] As a specific implementation of the reversing valve 2, see Figure 1 The valve core of the reversing valve 2 includes at least a first working position ( Figure 1 The left position in the middle) and the second working position ( Figure 1 In the right position), when the valve core of the reversing valve 2 is in the first working position, the second working oil port is connected to the oil return port through the reversing valve 2; when the valve core of the reversing valve 2 is in the second working position, the second working oil port is connected to the oil inlet through the reversing valve 2; specifically, the reversing valve 2 can be a two-position three-way reversing valve or a two-position four-way reversing valve.

[0040] Furthermore, the reversing valve 2 is an electromagnetic reversing valve or an electric proportional reversing valve, preferably an electric proportional reversing valve, so that the valve opening of the reversing valve 2 can be controlled by an electrical signal, thereby controlling the deflection angle of the cooling fan blades according to actual needs.

[0041] It should be noted that see Figure 1 The fan back-blow control valve of the utility model also includes a pressure sensor 5. The pressure sensor 5 is arranged in the oil circuit between the second working oil port B and the reversing valve 2. The pressure sensor 5 detects the oil pressure flowing to the second working oil port B in real time, so that fault detection can be performed. For example, when the valve core of the reversing valve 2 is stuck, the oil at the oil inlet P should flow to the second working oil port B through the reversing valve 2. At this time, the pressure signal detected by the pressure sensor 5 is abnormal and does not meet the working pressure of the fan blade angle control mechanism, indicating an oil circuit fault. The staff can be warned and the reversing valve 2 can be repaired and replaced.

[0042] Specifically, see Figure 2 The fan back-blow control valve of the utility model also includes a controller 6, which is electrically connected to the pressure sensor 5 and the electromagnet of the reversing valve 2 respectively. The controller 6 is configured to control the valve opening of the reversing valve 2 according to the pressure signal of the pressure sensor 5, so that the control oil pressure of the fan blade angle control mechanism can be accurately known according to the pressure sensor 5, and the deflection angle of the blade can be accurately controlled in cooperation with the electromagnetic proportional reversing valve 2.

[0043] Furthermore, the fan back-blowing control valve of the utility model also includes a temperature sensor 7, which is used to detect the refrigerant temperature of the radiator. The controller 6 is electrically connected to the temperature sensor 7 and the electromagnet of the reversing valve 2 respectively. The controller 6 is configured to control the reversing frequency of the reversing valve 2 according to the temperature signal of the temperature sensor 7. When the temperature in the radiator water tank is high, the fan back-blowing frequency is increased to improve the heat dissipation efficiency.

[0044] As a specific embodiment of the pressure reducing valve 3, the pressure reducing valve 3 is a pilot proportional pressure reducing valve, and its pilot end can be an electromagnetic pilot or a hydraulic pilot, so as to be able to proportionally control the pressure reducing valve 3, thereby adjusting the pressure of the second working oil port B and controlling the deflection angle of the cooling fan blade. It should be noted that the pilot proportional pressure reducing valve is only a preferred embodiment of the pressure reducing valve 3, and is not a limitation on its protection scope. The pressure reducing valve 3 is diverse, for example, the pressure reducing valve 3 is a direct-acting pressure reducing valve, a pilot pressure reducing valve, a proportional pressure reducing valve, etc.

[0045] As a specific implementation of the fan back-blowing control valve of the utility model, see Figure 1 , and also includes a first throttle hole 1 and a second throttle hole 4. The first throttle hole 1 is arranged on the oil circuit between the reversing valve 2 and the second working oil port, and the second throttle hole 4 is arranged on the oil circuit where the oil inlet connects the first working oil port and the pressure reducing valve 3, thereby reducing the oil pressure changes caused by vibration and impact, and ensuring the smooth operation of the fan blade angle control mechanism and the multi-way valve.

[0046] In order to facilitate understanding of the technical solution of the fan back-blow control valve of the present invention, the working process is explained below in combination with relatively preferred technical features.

[0047] See also Figure 1 and Figure 2 , the controller 6 obtains the temperature signal of the temperature sensor 7 in real time. When the temperature signal exceeds the set value, the controller 6 controls the electromagnet of the reversing valve 2 to be energized, so that the oil inlet P can be connected to the second working oil port B through the reversing valve 2, so as to supply oil to the fan back-blowing hydraulic cylinder, thereby adjusting the deflection angle of the fan blades and controlling the fan back-blowing for cleaning. A pressure reducing valve 3 is provided between the reversing valve 2 and the oil inlet P, so that the oil supply pressure of the second working oil port B is within the allowable working pressure of the fan back-blowing hydraulic cylinder. A pressure sensor 5 is provided between the second working oil port B and the reversing valve 2. Thus, the oil pressure at the second working oil port B can be detected, so as to adjust the valve port opening of the reversing valve 2 according to the pressure signal, accurately control the deflection angle of the fan blades, and control the fan to perform back-blowing operation, so as to blow away the dust and debris on the surface of the heat dissipation water tank to ensure its heat dissipation effect; after the fan back-blowing operation is completed, the electromagnet of the reversing valve 2 loses power, the valve core of the reversing valve 2 is reversed, the second working oil port B is disconnected from the oil inlet P, and the second working oil port B is connected to the oil return port T, so as to relieve the pressure of the fan back-blowing hydraulic cylinder, and the piston of the fan back-blowing hydraulic cylinder returns to the initial position, so that the blades of the heat dissipation fan return to the initial state. The fan back-blowing control does not require manual participation throughout the process, and does not require shutdown, so that the debris and dust on the surface of the water tank can be cleaned in a timely and efficient manner to ensure the heat dissipation effect of the engine; and the first working oil port A for connecting the hydraulic valve is connected between the oil inlet P, so that the hydraulic oil going to the multi-way valve does not pass through any hydraulic valve, reduces pressure loss, saves energy, and is not affected by the operation of the fan blades.

[0048] A second aspect of the utility model is a fan back-blow control system, comprising the above-mentioned fan back-blow control valve, which has all its beneficial effects and will not be described in detail here.

[0049] A third aspect of the utility model is an agricultural machine, comprising the above-mentioned fan back-blow control valve or the above-mentioned fan back-blow control system, having all the beneficial effects thereof, which will not be described in detail here.

[0050] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0051] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0052] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A fan blowback control valve, characterized in that: include: Oil inlet; Oil return port; A first working oil port, the first working oil port is used to connect the multi-way valve, and the first working oil port is connected to the oil inlet; a second working oil port, the second working oil port being used for connecting a fan blade angle control mechanism; a reversing valve (2), the reversing valve (2) being used to selectively connect the second working oil port to one of the oil inlet and the oil return port; A pressure reducing valve (3), wherein the pressure reducing valve (3) is arranged on the oil path between the reversing valve (2) and the oil inlet.

2. The fan blowback control valve according to claim 1, characterized in that: The valve core of the reversing valve (2) comprises at least a first working position and a second working position. When the valve core of the reversing valve (2) is in the first working position, the second working oil port is connected to the oil return port through the reversing valve (2); When the valve core of the reversing valve (2) is in the second working position, the second working oil port is connected to the oil inlet via the reversing valve (2).

3. The fan back-blow control valve according to claim 1 or 2, characterized in that: The reversing valve (2) is an electromagnetic reversing valve or an electric proportional reversing valve.

4. The fan blowback control valve according to claim 3, characterized in that: It also comprises a pressure sensor (5), wherein the pressure sensor (5) is arranged on the oil circuit between the second working oil port and the reversing valve (2).

5. The fan blowback control valve according to claim 4, characterized in that: The invention also comprises a controller (6), wherein the controller (6) is electrically connected to the pressure sensor (5) and the electromagnet of the reversing valve (2) respectively, and the controller (6) is configured to control the valve opening of the reversing valve (2) according to the pressure signal of the pressure sensor (5).

6. The fan blowback control valve according to claim 1, characterized in that: The pressure reducing valve (3) is a pilot proportional pressure reducing valve.

7. The fan blowback control valve according to claim 1, characterized in that: It also includes a temperature sensor (7) and a controller (6), wherein the temperature sensor (7) is used to detect the refrigerant temperature of the radiator, and the controller (6) is electrically connected to the temperature sensor (7) and the electromagnet of the reversing valve (2), respectively, and the controller (6) is configured to control the reversing frequency of the reversing valve (2) according to the temperature signal of the temperature sensor (7).

8. The fan blowback control valve according to claim 1, characterized in that: It also includes a first throttle hole (1) and a second throttle hole (4), wherein the first throttle hole (1) is arranged on the oil circuit between the reversing valve (2) and the second working oil port, and the second throttle hole (4) is arranged on the oil circuit connecting the oil inlet to the first working oil port and the pressure reducing valve (3).

9. A fan back-blowing control system, characterized in that: A fan blowback control valve comprising the fan blowback control valve according to any one of claims 1 to 8.

10. An agricultural machine, characterized in that: It comprises the fan back-blow control valve according to any one of claims 1 to 8 or the fan back-blow control system according to claim 9.

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