Prefill valve

Abstract

The prefill valve comprises a valve body, a valve element and an elastic piece, the valve body is provided with an inner cavity, a control oil port, a first oil port and a second oil port, the inner cavity is communicated with the control oil port, and the first oil port is communicated with the second oil port through the inner cavity; the control oil port is used for inputting or outputting pressure oil so that the valve element can move in the inner cavity in the direction away from or close to the control oil port, when the valve element is extruded by the pressure oil input by the control oil port, the elastic piece deforms, the valve element moves in the direction away from the control oil port, and then the first oil port can be closed. When the control oil port outputs pressure oil and the valve element is not extruded by the pressure oil, the elastic piece can restore deformation, and the valve element moves in the direction close to the control oil port so as to open the first oil port. The service life of the elastic piece is prolonged, the elastic piece is prevented from being broken, the reliability of the prefill valve is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to a liquid filling valve. Background Art

[0002] A bending machine is a machine that can bend thin plates. The power used for bending is an oil cylinder, and the oil pump drives the oil cylinder to operate to complete the bending work. The oil cylinder needs to move up and down. When the oil cylinder quickly returns without load after completing the bending work, there is a situation where the oil pump cannot supply oil to the oil cylinder. Therefore, a filling valve needs to be installed in the oil circuit. However, the existing filling valve pulls the elastic part to make the valve core in the upper position. The elastic part is very easy to break when it is pulled, which causes the filling valve to fail. Utility Model Content

[0003] According to one aspect of the utility model, a filling valve is provided, comprising:

[0004] The valve body comprises an inner cavity, a control oil port, a first oil port and a second oil port, wherein the inner cavity is connected with the control oil port, and the first oil port is connected with the second oil port through the inner cavity;

[0005] A valve core and an elastic member, wherein the control oil port is used to input or output pressure oil so that the valve core can move in the inner cavity away from or close to the control oil port. When the valve core is squeezed by the pressure oil input by the control oil port, the elastic member is deformed, and the valve core moves away from the control oil port, thereby closing the first oil port. When the control oil port outputs pressure oil and the valve core is not squeezed by the pressure oil, the elastic member will be able to restore the deformation, and the valve core moves toward the control oil port to open the first oil port.

[0006] The filling valve of the utility model inputs pressure oil into the inner cavity through the control oil port, the valve core is squeezed by the pressure oil, the elastic part is deformed, and the valve core can move away from the control oil port to close the first oil port; the pressure oil in the inner cavity is discharged from the control oil port, the valve core is not squeezed by the pressure oil, and the elastic part can restore the deformation, thereby driving the valve core to move toward the control oil port to open the first oil port. The filling valve arranged in this way is conducive to extending the service life of the elastic part and avoiding its breakage, improving the reliability of the filling valve and reducing the cost.

[0007] In some embodiments, the elastic member is a compression spring.

[0008] In some embodiments, a connecting rod is further included, wherein the connecting rod is installed in the control oil port, the valve core can move on the connecting rod in a direction away from or close to the control oil port, and the two ends of the elastic member are respectively connected to the connecting rod and the valve core.

[0009] In some embodiments, the valve core has a connection port for assembly with a connecting rod, and the connecting rod passes through the connection port and is slidably connected to the valve core.

[0010] In some embodiments, the valve core has a groove for accommodating an elastic member, the groove is formed by the end face of the valve core facing the second oil port being recessed toward the end face away from the second oil port, and the connecting port is formed by the groove penetrating the end face away from the second oil port.

[0011] In some embodiments, a first sealing ring is disposed between the inner wall of the connecting port of the valve core and the connecting rod.

[0012] In some embodiments, a cover plate is further included, the valve body has an installation port, the cover plate is used to cover the installation port, the control oil port is formed by an inner cavity passing through the cover plate, and the connecting rod is installed on the cover plate and placed on the inner side of the control oil port.

[0013] In some embodiments, the valve core is used to slideably connect with the inner wall of the valve body in the inner cavity and divide the inner cavity into a control oil chamber and a liquid filling chamber, the control oil chamber is connected to the control oil port, and the first oil port is connected to the second oil port through the liquid filling chamber.

[0014] In some embodiments, a second sealing ring is disposed between the valve core and the inner wall of the inner cavity of the valve body.

[0015] In some embodiments, the first oil port is used to connect to an oil tank, and the second oil port is used to connect to an oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the filling valve of the utility model when the first oil port is closed;

[0017] Figure 2 It is a cross-sectional view of the filling valve of the utility model when the first oil port is opened.

[0018] In the figure: 10, valve body; 11, control oil port; 12, first oil port; 13, second oil port; 14, valve core; 15, elastic member; 16, connecting rod; 17, groove; 18, first sealing ring; 19, cover plate; 20, control oil chamber; 21, liquid filling chamber; 22, second sealing ring. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0024] Please refer to Figure 1-2 This embodiment provides a liquid filling valve, including a valve body 10, a valve core 14, an elastic member 15, a connecting rod 16 and a cover plate 19. The cover plate 19 is used to close the valve body 10. The valve core 14 moves in the valve body 10 through the connecting rod 16 to be filled with liquid. The elastic member 15 is used to reset the valve core 14.

[0025] The valve body 10 has an inner cavity, a control oil port 11, a first oil port 12 and a second oil port 13. The inner cavity is connected to the control oil port 11, and the first oil port 12 is connected to the second oil port 13 through the inner cavity. The control oil port 11 is used to input or output pressure oil so that the valve core 14 can move in the inner cavity away from or close to the control oil port 11. Please refer to Figure 1 When the valve core 14 is squeezed by the pressure oil input from the control oil port 11, the elastic member 15 is deformed, and the valve core 14 moves away from the control oil port 11, thereby closing the first oil port 12; please refer to Figure 2 When the control oil port 11 outputs the pressure oil and the valve core 14 is not squeezed by the pressure oil, the elastic member 15 will be able to restore its deformation, and the valve core 14 moves toward the control oil port 11 to open the first oil port 12. The filling valve arranged in this way is conducive to extending the service life of the elastic member 15 and avoiding its breakage, improving the reliability of the filling valve and reducing the cost.

[0026] Due to the structural setting of the existing filling valve, the elastic member 15 is a tension spring, which usually adopts a spiral structure socket spring. The size and performance consistency of the socket spring are poor, and it is very easy to break when it is stretched. Figure 1-2 The filling valve in this embodiment further limits the elastic member 15 to a compression spring on the basis of the above structure. Compared with the prior art, the compression spring can still achieve the same performance in the same space through structural improvement, which can greatly extend the service life of the filling valve and avoid its breakage, thereby improving the reliability of the filling valve and reducing the cost.

[0027] Please refer to Figure 1-2 The connecting rod 16 is installed in the control oil port 11, and the valve core 14 can move on the connecting rod 16 in a direction away from or close to the control oil port 11. The two ends of the elastic member 15 are respectively connected to the connecting rod 16 and the valve core 14. In this way, the movement of the valve core 14 can be effectively controlled.

[0028] Please refer to Figure 1-2 The valve core 14 has a connection port for assembling with the connecting rod 16, and the connecting rod 16 is provided with the connection port and is slidably connected with the valve core 14. Thus, the effective sliding of the valve core 14 on the connecting rod 16 can be achieved.

[0029] Please refer to Figure 1-2 The valve core 14 has a groove 17 for accommodating the elastic member 15. The groove 17 is formed by the end surface of the valve core 14 facing the second oil port 13 being recessed toward the end surface away from the second oil port 13. The connecting port is formed by the groove 17 penetrating the end surface away from the second oil port 13. Even if the valve core 14 is buckled on the connecting rod 16, the elastic member 15 can be accommodated in the groove 17, which facilitates the movement of the valve core 14 in the inner cavity.

[0030] Please refer to Figure 1A first sealing ring 18 is provided between the inner wall of the connecting port of the valve core 14 and the connecting rod 16 , so as to prevent the pressure oil from entering the groove 17 through the connecting port and affecting the control effect of the control oil port 11 on the movement of the valve core 14 .

[0031] Please refer to Figure 1-2 The valve body 10 has an installation opening, a cover plate 19 is installed at the installation opening to cover the installation opening, the control oil port 11 is formed by the inner cavity penetrating upward through the top surface of the cover plate 19, and the connecting rod 16 is installed on the cover plate 19 and placed inside the control oil port 11. Therefore, it is convenient to control the movement of the valve core 14 on the connecting rod 16 through the pressure oil.

[0032] Please refer to Figure 1 The valve core 14 is used to be slidably connected with the inner wall of the inner cavity of the valve body 10 and divide the inner cavity into a control oil cavity 20 and a liquid filling cavity 21. The control oil cavity 20 is connected with the control oil port 11, and the first oil port 12 is connected with the second oil port 13 through the liquid filling cavity 21. That is, the control oil cavity 20 and the liquid filling cavity 21 are effectively separated, and the pressure oil can enter and exit the control oil cavity 20 through the control oil port 11. The oil supplied to the oil cylinder in the oil circuit enters the liquid filling cavity 21 through the first oil port 12 and then flows out from the second oil port 13 to complete the liquid filling, and the structure of the valve body 10 is arranged reasonably.

[0033] Please refer to Figure 1 A second sealing ring 22 is provided between the valve core 14 and the inner wall of the inner cavity of the valve body 10 , which can help improve the separation effect of the control oil cavity 20 and the liquid filling cavity 21 .

[0034] Please refer to Figure 1-2 , the control oil port 11 is located at the top of the valve body 10 and connected to the pressure oil output end of the control system, the first oil port 12 is located at the side of the valve body 10 and is used to connect to the oil tank, and the second oil port 13 is located at the bottom of the valve body 10 and is used to connect to the oil cylinder. When the oil cylinder is pulled down quickly, negative pressure will be generated. Due to the action of the compression spring, the valve core 14 makes the first oil port 12 in a normally open state, and the oil can enter the filling chamber 21 through the first oil port 12 and be supplied to the oil pump through the second oil port 13. When the first oil port 12 is to be closed, the control system inputs pressure oil to the control oil port 11, and the control oil port 11 will be supported by the pressure to maintain the pressure of the control oil chamber 20, and the valve core 14 moves downward to close the first oil port 12, and the compression spring is compressed by the valve core 14. When the pressure of the control oil port 11 is released, the compression spring stretches and resets to drive the valve core 14 upward to open the first oil port 12. Then when the cylinder moves upward, the oil can enter the filling chamber 21 through the second oil port 13, and return to the oil tank from the filling chamber 21 through the first oil port 12.

[0035] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A filling valve, characterized in that: include: The valve body comprises an inner cavity, a control oil port, a first oil port and a second oil port, wherein the inner cavity is connected with the control oil port, and the first oil port is connected with the second oil port through the inner cavity; A valve core and an elastic member, wherein the control oil port is used to input or output pressure oil so that the valve core can move in the inner cavity away from or close to the control oil port. When the valve core is squeezed by the pressure oil input by the control oil port, the elastic member is deformed, and the valve core moves away from the control oil port, thereby closing the first oil port. When the control oil port outputs pressure oil and the valve core is not squeezed by the pressure oil, the elastic member will be able to restore the deformation, and the valve core moves toward the control oil port to open the first oil port.

2. The filling valve according to claim 1, characterized in that: The elastic member is a compression spring.

3. The filling valve according to claim 1, characterized in that: It also includes a connecting rod, which is installed in the control oil port. The valve core can move on the connecting rod in a direction away from or close to the control oil port. The two ends of the elastic member are respectively connected to the connecting rod and the valve core.

4. The filling valve according to claim 3, characterized in that: The valve core is provided with a connection port for assembling with a connecting rod, and the connecting rod passes through the connection port and is slidably connected with the valve core.

5. The filling valve according to claim 4, characterized in that: The valve core has a groove for accommodating the elastic member, the groove is formed by the end face of the valve core facing the second oil port being recessed toward the end face away from the second oil port, and the connecting port is formed by the groove penetrating the end face away from the second oil port.

6. The filling valve according to claim 4, characterized in that: The valve core is provided with a first sealing ring between the inner wall of the connecting port and the connecting rod.

7. The filling valve according to claim 3, characterized in that: It also includes a cover plate, the valve body has a mounting opening, the cover plate is used to cover the mounting opening, the control oil port is formed by an inner cavity passing through the cover plate, and the connecting rod is installed on the cover plate and placed inside the control oil port.

8. The filling valve according to claim 1, characterized in that: The valve core is used to be slidably connected with the inner wall of the valve body in the inner cavity and divide the inner cavity into a control oil cavity and a liquid filling cavity. The control oil cavity is connected to the control oil port, and the first oil port is connected to the second oil port through the liquid filling cavity.

9. The filling valve according to claim 1, characterized in that: A second sealing ring is arranged between the valve core and the inner wall of the valve body in the inner cavity.

10. The filling valve according to claim 1, characterized in that: The first oil port is used to connect to the oil tank, and the second oil port is used to connect to the oil cylinder.

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