Split type pressure flow control valve for pump

Abstract

The utility model provides a split type pressure flow control valve for a pump, which comprises a first valve body, a second valve body, a first oil duct and a second oil duct, a first valve core and a pressure adjusting spring are arranged in the first valve body, a second valve core and a control oil cavity are arranged in the second valve body, and the first oil duct and the second oil duct are communicated. The first valve element is elastically pressed at one end of the first valve body by the pressure adjusting spring, the second valve element is pressed at one end of the second valve body by the internal pressure of the control oil cavity, one end of the first oil channel is used for allowing high-pressure oil of a pump outlet to flow in, and the other end of the first oil channel communicates with the first valve body and the second valve body. The first valve element can be pushed by high-pressure oil to enable the first oil way to be communicated with the second oil way, and the second valve element can also be pushed by the high-pressure oil to move towards the other end of the second valve body to enable the first oil way to be communicated with the second oil way. Aiming at the defects in the prior art, the utility model provides the split type pressure flow control valve for the pump, which is more flexible to use and can reduce the manufacturing and material cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to control valve field especially, it is a split type pressure flow control valve for pump. BACKGROUND

[0002] Pump is the power core component of hydraulic transmission, and the pressure and flow control of its export play a decisive role to the working efficiency, stability and safety of the whole system, and the control valve is the key control element of pump, the pressure flow control valve of prior art mostly adopts integrated structure, that is, the pressure control module and flow control module are integrated cast in the same valve body, although compact characteristics can be possessed, but in the actual use process, the integral type structure is seriously lack of flexibility, when the hydraulic system only needs pressure or flow control function under certain working conditions, the rest part not only causes the additional material cost, but also additionally increases the unnecessary flow passage resistance, influences the overall effect, and the integrated structure is not convenient for quick maintenance, once the fault appears, the whole valve body often needs to be disassembled or even replaced, increases the difficulty of maintenance. SUMMARY

[0003] In view of the deficiency of prior art, the utility model provides a split type pressure flow control valve for pump that is more flexible to use and can reduce manufacturing and material costs.

[0004] In order to achieve the above object, the utility model provides a split type pressure flow control valve for pump, comprising first valve body, second valve body, first oil channel and second oil channel, the first valve body and second valve body are attached, first valve core and pressure adjusting spring are arranged in the first valve body, second valve core and control oil cavity are arranged in the second valve body, the first valve core is elastically pressed at one end of the first valve body by the pressure adjusting spring, the second valve core is pressed at one end of the second valve body by the pressure in the control oil cavity, one end of the first oil channel is used for the high pressure oil of pump export to flow in, and the other end of the first oil channel is communicated to one end of the first valve body and one end of the second valve body, one end of the second oil channel is communicated to the control cavity of pump, the first valve core can be moved to the first oil channel and the second oil channel form communication under the impetus of high pressure oil to the other end of the first valve body, and the second valve core can also be moved to the first oil channel and the second oil channel form communication under the impetus of high pressure oil to the other end of the second valve body.

[0005] The advantages of the above technical scheme are as follows: in terms of functional adaptability, the traditional integrated structure is integrated with the pressure and flow control modules, and whether the system needs full function, the redundant modules will cause material waste and flow passage resistance increase; in the application, the first valve body and the second valve body are arranged in a matched manner, the first valve body and the second valve body in the first valve body and the second valve body correspond to pressure and flow control respectively, both of which can be simultaneously or individually enabled according to actual needs, have strong adaptability, and can be individually disassembled and replaced, thereby facilitating maintenance and repair, and in use, the first valve core is only balanced controlled by high-pressure oil thrust and pressure adjusting spring force, the second valve core is only balanced controlled by high-pressure oil thrust and pressure in the control oil cavity, both of which are independent and do not interfere with each other, can accurately respond to pressure and flow signals respectively, stably control the output pressure and flow of the pump, and ensure the operation stability and efficiency of the pump.

[0006] The utility model discloses further can set up as: second oil channel including being located first valve body and second valve body on first section and second section respectively, first section and second section of the described are misaligned and set up, the second oil channel is formed with the control cavity of pump communication through second section, first valve body and second valve body still be provided with the auxiliary flow channel that communicates to first section, second valve core moves to the other end of second valve body, and first oil channel can form the communication of second oil channel through auxiliary flow channel.

[0007] Through further setting, the misaligned setting of the first section and the second section of the second oil channel on the first valve body and the second valve body adapts the characteristics of the split structure, and the setting of the auxiliary flow channel can provide an independent communication path for flow control in the working state, only when the second valve core moves to the other end of the second valve body, the high-pressure oil of the first oil channel will be conducted through the auxiliary flow channel and the second oil channel, which ensures the independent action of pressure control and flow control and avoids the oil interference between the pressure control module and the flow control module.

[0008] The utility model discloses further can set up as: the spring group of the control oil cavity is provided with the elastic cooperation with second valve core, and the adjustable flow valve that communicates to the pump export is connected on the control oil cavity.

[0009] Through further setting, the spring group in the control oil cavity elastically matched with the second valve core can provide stable elastic feedback force for the second valve core, and the adjustable flow valve connected with the control oil cavity is used to adjust the oil flow from the pump outlet into the control oil cavity, thereby forming a resultant force and limiting the second valve core.

[0010] The utility model discloses further can set up as: the first valve body is provided with the adjusting rod, and the adjusting rod is screwed at the other end of the first valve body and forms the abutment cooperation with the pressure adjusting spring.

[0011] Through further setting, the adjusting rod screwed on the first valve body is in abutting fit with the pressure adjusting spring, the compression amount of the pressure adjusting spring can be conveniently adjusted by rotating the adjusting rod, and then the size of the elastic force is adjusted, so that the structure is simple and the use is flexible.

[0012] The utility model discloses further set up: the annular groove of surrounding second oil channel is arranged between the first valve body and the second valve body, and the sealing ring is arranged at the annular groove.

[0013] Through further setting, the annular groove and the sealing ring are arranged between the first valve body and the second valve body and surround the second oil channel, so that the sealing between the first valve body and the second valve body is formed, the high-pressure oil in the second oil channel is effectively blocked from leaking from the abutting surface, and it is ensured that the oil can accurately pass through the second oil channel and enter the control cavity of the pump.

[0014] The utility model discloses further set up: the oil return flow channel is still arranged between the first valve body and the second valve body, and the oil return flow channel is arranged at the other end close to the first valve body and the second valve body.

[0015] Through further setting, the oil return flow channel is arranged between the first valve body and the second valve body and close to the other end, so that the oil remaining in the valve core after the action of the valve core in the two valve bodies can be conveniently recovered, the oil accumulation in the abutting surface is avoided, the action flexibility of the valve core is avoided to be affected or internal leakage is avoided, and the stability of the product is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure diagram of the utility model embodiment Figure 1 ;

[0017] Figure 2 It is the structure diagram of the utility model embodiment Figure 2 ;

[0018] Figure 3 It is the internal structure diagram of the utility model embodiment

[0019] Figure 4 It is the sectional view of the utility model embodiment Figure 3 at A-A

[0020] Figure 5 It is the principle diagram of the utility model embodiment

[0021] Among them: the first valve body 1;The first valve core 11;Pressure adjusting spring 12;Adjusting rod 13;The second valve body 2;Second valve core 21;Control oil cavity 22;Spring group 23;Annular groove 3;Sealing ring 4;First oil channel a;Second oil channel b;First section b1;Second section b2;Auxiliary flow channel c;Oil return flow channel d;Control cavity e. DETAILED DESCRIPTION

[0022] The utility model discloses a kind of implementation examples of split type pressure flow control valve for pump as shown in Figures 1-5 As shown: including first valve body 1, second valve body 2, first oil channel a and second oil channel b, the first valve body 1 and second valve body 2 are attached, first valve body 1 is provided with first valve core 11 and pressure regulating spring 12, the second valve body 2 is provided with second valve core 21 and control oil cavity 22, the first valve core 1 is elastically pressed at one end of first valve body 1 by pressure regulating spring 12, the second valve core 21 is pressed at one end of second valve body 2 by control oil cavity 22, one end of the first oil channel a is used for the high-pressure oil of pump outlet to flow into, and the other end of first oil channel a is communicated to one end of first valve body 1 and one end of second valve body 2, one end of the second oil channel b is communicated to the control cavity e of pump, first valve core 11 can be moved to first oil channel a and second oil channel b form communication under the impetus of high-pressure oil towards the other end of first valve body 1, second valve core 21 can also be moved to first oil channel a and second oil channel b form communication under the impetus of high-pressure oil towards the other end of second valve body 2.

[0023] The second oil channel b includes first segment b1 and second segment b2 on first valve body 1 and second valve body 2 respectively, the first segment b1 and second segment b2 are misaligned, the second oil channel b is communicated with the control cavity e of pump through second segment b2, the first valve body 1 and second valve body 2 are also provided with auxiliary flow channel c communicated to first segment, after the second valve core 21 moves towards the other end of second valve body 2, first oil channel a can be communicated with second oil channel b through auxiliary flow channel c.

[0024] The control oil cavity 22 is provided with spring group 23 elastically matched with second valve core 21, and adjustable flow valve connected to pump outlet is connected to control oil cavity 22.

[0025] The first valve body 1 is provided with adjusting rod 13, and the adjusting rod 13 is screwed at the other end of first valve body 1 and abuts with pressure regulating spring 12.

[0026] The first valve body 1 and second valve body 2 are provided with ring groove 3 around second oil channel b, and sealing ring 4 is arranged at ring groove 3.

[0027] The first valve body 1 and second valve body 2 are also provided with oil return flow channel d, and the oil return flow channel d is arranged at the other end close to first valve body and second valve body.

[0028] The principle diagram of the embodiment is as attached Figure 5As shown: wherein, DR is the pressure control module, the first valve core 11 is balanced between the high pressure oil thrust and the pressure adjusting spring elastic force 12, when the system pressure changes, the first valve core 11 moves, controls the oil flow of the second oil channel b to the control cavity e of the pump, adjusts the output pressure of the pump;FR is the flow control module, the second valve core 21 is balanced between the high pressure oil thrust and the internal pressure of the control oil cavity 22, when the system flow demand changes, the second valve core 21 moves, transports the oil to the control cavity e through the second oil channel b, adjusts the output flow of the pump, TV is the adjustable flow valve, cooperates with the flow control module, and assists in controlling the internal pressure of the control oil cavity 22.

[0029] The above examples are only one of the preferred specific examples of the utility model, and the usual changes and replacements made by those skilled in the art within the technical scheme range of the utility model are all included in the protection range of the utility model.

Claims

1. A split pressure flow control valve for a pump, characterized by: The valve body comprises a first valve body, a second valve body, a first oil passage and a second oil passage, the first valve body and the second valve body are arranged in close contact, the first valve body is provided with a first valve core and a pressure regulating spring, the second valve body is provided with a second valve core and a control oil cavity, the first valve core is elastically pressed at one end of the first valve body by the pressure regulating spring, the second valve core is elastically pressed at one end of the second valve body by the pressure in the control oil cavity, one end of the first oil passage is used for the high-pressure oil from the pump outlet to flow in, and the other end of the first oil passage is communicated to one end of the first valve body and one end of the second valve body, one end of the second oil passage is communicated to the control cavity of the pump, the first valve core can move towards the other end of the first valve body under the push of the high-pressure oil to form communication between the first oil passage and the second oil passage, and the second valve core can also move towards the other end of the second valve body under the push of the high-pressure oil to form communication between the first oil passage and the second oil passage.

2. The split pressure and flow control valve for a pump of claim 1, wherein: The second oil passage comprises a first section and a second section arranged on the first valve body and the second valve body respectively, the first section and the second section are arranged in a staggered manner, the second oil passage is communicated to the control cavity of the pump through the second section, the first valve body and the second valve body are further provided with an auxiliary flow passage communicated to the first section, and the first oil passage can be communicated to the second oil passage through the auxiliary flow passage after the second valve core moves towards the other end of the second valve body.

3. The split pressure and flow control valve for a pump according to claim 1 or 2, characterized in that: The control oil cavity is provided with a spring group elastically matched with the second valve core, and the control oil cavity is connected with an adjustable flow valve communicated to the pump outlet.

4. The split pressure and flow control valve for a pump according to claim 1 or 2, characterized in that: The first valve body is provided with an adjusting rod, the adjusting rod is screwed at the other end of the first valve body and abuts against the pressure regulating spring.

5. The split pressure and flow control valve for a pump of claim 1 or 2, wherein: The first valve body and the second valve body are provided with a ring groove around the second oil passage, and the ring groove is provided with a sealing ring.

6. The split pressure and flow control valve for a pump of claim 1 or 2, wherein: The first valve body and the second valve body are further provided with an oil return flow passage arranged close to the other end of the first valve body and the second valve body.

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