Manual pump capable of controlling oil return flow

Abstract

The utility model discloses a manual pump capable of controlling oil return flow, which relates to the field of manual pumps and is characterized by further comprising an oil return pipeline connected with an oil outlet path and an oil tank, a stop valve mounted on the oil return pipeline and used for controlling the oil return pipeline to be opened and closed, and a flow control valve used for controlling the oil return flow. The stop valve is arranged on the oil return pipeline, the oil return pipeline is cut off in the process of supplying oil to the hydraulic equipment and using the hydraulic equipment, the situation that the hydraulic equipment descends due to oil return in the using process is avoided, and the safety protection effect is achieved; the flow control valve is arranged and used for controlling the flow during oil return, so that it is ensured that the hydraulic equipment can descend slowly, and the problems that due to the fact that the descending speed is too high, articles supported by the hydraulic equipment fall off, and safety accidents are caused are solved.

Description

Technical Field

[0001] The utility model relates to the field of manual pumps, in particular to a manual pump with controllable oil return flow. Background Art

[0002] A manual pump is a manually operated liquid transmission device, which is generally used in occasions such as refueling and oil transmission. During the working process, the existing manual pump pumps hydraulic oil into the hydraulic equipment to make the hydraulic equipment work. When unloading the oil, the hydraulic equipment directly returns the oil to the tank through the oil circuit. If a heavy object is supported on the hydraulic equipment, the weight of the heavy object will increase the speed of the oil return, resulting in a too fast oil return speed. Once the oil return speed is too fast, the hydraulic equipment will drop rapidly, and the heavy object supported by the hydraulic equipment will also drop rapidly. When the hydraulic equipment falls to the bottom, a reaction force will be generated on the supported heavy object, which can easily cause the supported heavy object to fall from the hydraulic equipment, causing damage to the objects, and even injury to the users, resulting in safety accidents. For this reason, a manual pump with controllable oil return flow is proposed. Utility Model Content

[0003] The main purpose of the utility model is to provide a method that can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: including a valve seat, a manual pump body installed on the valve seat, a manual reversing valve installed on the valve seat and connected to the manual pump body through an oil circuit, an oil tank connected to the manual pump body through an oil circuit, a hydraulically controlled valve lock installed on the valve seat and connected to the manual reversing valve through an oil circuit, a balancing valve installed on the valve seat and connected to the hydraulically controlled valve lock through an oil circuit, and an oil outlet oil circuit communicated with the balancing valve, characterized in that it also includes a return oil pipeline connected to the oil outlet oil circuit and the oil tank, a stop valve installed on the return oil pipeline for controlling the opening and closing of the return oil pipeline, and a flow control valve for controlling the return oil flow.

[0005] Preferably, the manual pump body is connected to the oil tank with a spare oil supply line, and a filter and a one-way valve are installed on the oil supply line.

[0006] Preferably, a safety valve is connected between the oil supply circuit and the oil tank via a pipeline.

[0007] Preferably, a one-way valve is also installed on the oil circuit connecting the manual pump body and the manual reversing valve.

[0008] Preferably, the oil outlet circuit includes an oil outlet circuit A and an oil outlet circuit B which are connected to the balancing valve.

[0009] The utility model has the following beneficial effects:

[0010] By setting a stop valve on the oil return pipeline, the oil return pipeline can be cut off during the oil supply to the hydraulic equipment and the use of the hydraulic equipment, so as to avoid oil return during use and cause the hydraulic equipment to fall, thereby playing a safety protection role; by setting a flow control valve to control the flow rate during oil return, it is ensured that the hydraulic equipment can descend slowly, avoiding the falling of items supported by the hydraulic equipment and safety accidents caused by excessive descent speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the working principle of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the utility model;

[0013] Figure 3 It is a schematic diagram of the structure of the utility model;

[0014] Legend: 1. Valve seat; 2. Manual pump body; 3. Filter; 4. Check valve; 5. Oil tank; 6. Safety valve; 7. Manual reversing valve; 8. Hydraulic valve lock; 9. Balance valve; 10. Oil outlet line A; 11. Oil outlet line B; 12. Stop valve; 13. Flow control valve; 14. Oil supply line; 15. Oil return line. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0016] like Figure 1-3 As shown, a manual pump with controllable return oil flow rate comprises a valve seat 1, a manual pump body 2 mounted on the valve seat 1, a manual reversing valve 7 mounted on the valve seat 1 and connected to the manual pump body 2 through an oil circuit, an oil tank 5 connected to the manual pump body 2 through an oil circuit, a hydraulically controlled valve lock 8 mounted on the valve seat 1 and connected to the manual reversing valve 7 through an oil circuit, a balancing valve 9 mounted on the valve seat 1 and connected to the hydraulically controlled valve lock 8 through an oil circuit, and an oil outlet oil circuit connected to the balancing valve 9, characterized in that it also comprises an oil return pipeline 15 connected to the oil outlet oil circuit and the oil tank (5), and a return pipeline 15 mounted on the return pipeline The stop valve 12 on the pipeline 15 is used to control the opening and closing of the return oil pipeline 15, and the flow control valve 13 is used to control the return oil flow. By setting the stop valve 12 on the return oil pipeline 15, the return oil pipeline 15 is cut off during the oil supply to the hydraulic equipment and the use of the hydraulic equipment, so as to avoid the return oil during use and cause the hydraulic equipment to fall, thereby playing a safety protection role; by setting the flow control valve 13, it is used to control the flow during the return oil, thereby ensuring that the hydraulic equipment can descend slowly, avoiding the objects supported by the hydraulic equipment from falling and safety accidents.

[0017] In one embodiment, the manual pump body 2 is connected to the oil tank 5 with a backup oil supply circuit 14, and a filter 3 and a one-way valve 4 are installed on the oil supply circuit 14. By setting up a double oil circuit, the stability of the oil supply process is ensured.

[0018] In one embodiment, a safety valve 6 is connected between the oil supply circuit 14 and the oil tank 5 through an oil circuit. Through the setting of the safety valve, when the oil pressure in the oil circuit exceeds a set value, the safety valve is opened to return oil.

[0019] In one embodiment, a one-way valve 4 is also installed on the oil path connecting the manual pump body 2 and the manual reversing valve 7 .

[0020] In one embodiment, the oil outlet circuit includes an oil outlet circuit A10 and an oil outlet circuit B11 which are connected to the balancing valve 9 .

[0021] The working process of the utility model is as follows: by pressing the manual pump body 2, the hydraulic oil flows from the oil tank 5 to the manual reversing valve 7 through the oil supply oil circuit 14, and then enters the hydraulic valve lock 8 through the manual reversing valve 7 and the oil circuit, and then flows to the balance valve 9. After the pressure of the hydraulic oil is balanced by the balance valve 9, the hydraulic oil is injected into the hydraulic equipment through the oil outlet oil circuit A or the oil outlet oil circuit B; when returning the oil, open the stop valve 12, and the oil in the hydraulic equipment flows to the oil tank 5 through the oil outlet oil circuit. Before flowing into the oil tank 5, the return oil flow is controlled by the flow control valve 12, and the hydraulic oil after the flow control flows back to the oil tank 5, and the hydraulic equipment slowly descends to realize the oil return.

[0022] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A manual pump with controllable oil return flow, comprising a valve seat (1), a manual pump body (2) mounted on the valve seat (1), a manual reversing valve (7) mounted on the valve seat (1) and connected to the manual pump body (2) via an oil circuit, an oil tank (5) connected to the manual pump body (2) via an oil circuit, a hydraulically controlled valve lock (8) mounted on the valve seat (1) and connected to the manual reversing valve (7) via an oil circuit, a balancing valve (9) mounted on the valve seat (1) and connected to the hydraulically controlled valve lock (8) via an oil circuit, and an oil outlet oil circuit connected to the balancing valve (9), characterized in that: It also includes an oil return pipeline (15) connected to the oil outlet pipeline and the oil tank (5), a stop valve (12) installed on the oil return pipeline (15) for controlling the opening and closing of the oil return pipeline (15), and a flow control valve (13) for controlling the return oil flow rate.

2. A manual pump with controllable oil return flow rate according to claim 1, characterized in that: The manual pump body (2) is connected to the oil tank (5) via a spare oil supply line (14), and a filter (3) and a one-way valve (4) are mounted on the oil supply line (14).

3. A manual pump with controllable oil return flow rate according to claim 2, characterized in that: A safety valve (6) is also connected between the oil supply circuit (14) and the oil tank (5) via an oil circuit.

4. A manual pump with controllable oil return flow rate according to claim 1, characterized in that: A one-way valve (4) is also installed on the oil path connecting the manual pump body (2) and the manual reversing valve (7).

5. A manual pump with controllable oil return flow rate according to claim 1, characterized in that: The oil outlet circuit comprises an oil outlet circuit A (10) and an oil outlet circuit B (11) which are connected to the balance valve (9).

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