Double-runner reversing valve

Abstract

The utility model discloses a double-flow-channel reversing valve which comprises a valve body (1) which limits a valve chamber (10) and is provided with a mounting interface (11), and an oil inlet (P), a first working oil port (A), a second working oil port (B) and oil return ports (Ta and Tb) are formed in the valve body (1); the valve core (2) is mounted in the valve chamber (10) and can axially slide to limit a neutral valve position, a first working valve position and a second working valve position of the double-flow-channel reversing valve; the valve body (1) and the valve element (2) are configured in the mode that at the first working valve position, the oil inlet (P) is communicated with the first working oil port (A) and the second working oil port (B), and the oil return ports (Ta and Tb) are cut off; at the second working valve position, the oil inlet (P) is cut off, and the first working oil port (A) and the second working oil port (B) are respectively communicated with the oil return ports (Ta and Tb); the flow area of the oil inlet (P) is larger than 0.5 times of the sum of the flow area of the first working oil port (A) and the flow area of the second working oil port (B).

Description

Technical Field

[0001] This application relates to a dual-channel reversing valve. Background Technology

[0002] In fluid transport, directional control valves are frequently used. A typical four-way directional control valve usually includes a P port (inlet), a T port (return port), an A port (first working port), and a B port (second working port). In one working position, the P port is connected to the A port, and the B port is connected to the T port; in another working position, the P port is connected to the B port, and the A port is connected to the T port. In some specific applications, the directional control valve needs to be modified into a dual-flow-path configuration, so that in one working position, the P port is simultaneously connected to the A and B ports, and in another working position, the A and B ports are simultaneously connected to the T port. The dual-flow-path configuration can be achieved by modifying the internal structure of the valve. Typically, the flow area of ​​each port on the mounting interface of the directional control valve is equal to ensure that the oil circuit interfaces mating with the ports have a uniform specification. For a dual-flow-path directional control valve, if equal flow areas are used for the ports, when the P port is simultaneously connected to the A and B ports, the smaller flow area of ​​the P port will lead to excessive pressure drop. For applications requiring low pressure drop, such as injection molding machine applications, this dual-flow reversing valve design is difficult to meet the requirements. Utility Model Content

[0003] One object of this application is to provide a dual-flow-channel directional valve that can reduce the pressure drop of the valve.

[0004] To this end, this application provides a dual-flow-channel directional valve in one aspect, comprising: a valve body defining a valve chamber and having an installation interface forming an inlet, a first working port, a second working port, and a return port; and a valve core mounted in the valve chamber and axially slidable to define a neutral valve position, a first working valve position, and a second working valve position of the dual-flow-channel directional valve; characterized in that, in the first working valve position, the inlet is connected to the first working port and the second working port respectively, and the return port is cut off; in the second working valve position, the inlet is cut off, and the first working port and the second working port are connected to the return port respectively; the flow area of ​​the inlet is greater than 0.5 times the sum of the flow areas of the first working port and the second working port.

[0005] In one feasible exemplary embodiment, the flow area of ​​the oil inlet is greater than 0.8 times the sum of the flow areas of the first working oil inlet and the second working oil inlet.

[0006] In one feasible exemplary embodiment, the flow area of ​​the oil inlet is less than 1.2 times the sum of the flow areas of the first working oil inlet and the second working oil inlet.

[0007] In one feasible exemplary embodiment, the flow area of ​​the oil inlet is equal to the sum of the flow areas of the first working oil inlet and the second working oil inlet.

[0008] In one feasible exemplary embodiment, the first working oil port and the second working oil port are respectively circular holes with a diameter of approximately 11 mm, and the oil inlet is a circular hole with a diameter of approximately 15.6 mm.

[0009] In one feasible exemplary embodiment, the oil return port includes a first oil return port and a second oil return port, and the flow areas of the first working oil port, the second working oil port, the first oil return port, and the second oil return port are equal.

[0010] In one feasible exemplary embodiment, the second working oil port and the first return oil port are distributed in the longitudinal middle of the installation interface, the oil inlet is disposed on the installation interface on the first longitudinal side of the first working oil port and the second working oil port, and the first return oil port and the second return oil port are disposed on the installation interface on the second longitudinal side of the first working oil port and the second working oil port.

[0011] In one feasible exemplary embodiment, the oil inlet is positioned at a horizontally centered position on the mounting interface.

[0012] In one feasible exemplary embodiment, the valve body and valve core are further configured such that, in the neutral valve position, the oil inlet, the first working oil port, the second working oil port, and the return oil port are all cut off.

[0013] In one feasible exemplary embodiment, the valve body and valve core are further configured such that, in the neutral valve position, the oil inlet, the first working oil port, the second working oil port, and the oil return port are throttled and connected.

[0014] According to the dual-flow-channel directional valve of this application, by designing a connection path between the two working ports inside the valve, the two working ports can be supplied or returned oil simultaneously, and the flow area of ​​the inlet and the two working ports is optimized, thereby reducing the pressure drop of the valve and improving the overall performance of the valve. Attached Figure Description

[0015] The foregoing and other aspects of this application will be more fully understood and appreciated through the following detailed description with reference to the accompanying drawings, in which:

[0016] Figures 1-3 This is a hydraulic symbol diagram of an exemplary dual-flow-channel directional valve of this application;

[0017] Figure 4 This is a cross-sectional view of an exemplary structure of the dual-channel directional valve of this application;

[0018] Figure 5 , Figure 6 These are cross-sectional views of the valve body and valve core of the dual-flow-channel directional valve of this application, respectively.

[0019] Figure 7 , Figure 8 These are cross-sectional views of the two working valve positions of the dual-channel directional valve of this application.

[0020] Figure 9 This is a schematic diagram of the installation interface of the dual-channel directional valve of this application;

[0021] Figure 10 This is a schematic diagram comparing the installation interface of the dual-flow-channel directional valve of this application with that of a conventional directional valve. Detailed Implementation

[0022] This application generally relates to a two-channel directional valve for conveying fluids, and the hydraulic symbol for one type of such a two-channel directional valve is shown in... Figure 1 As shown in the image. From Figure 1 As can be seen, this dual-flow directional valve is a three-position four-way directional valve with three valve positions and four ports. The three valve positions are: neutral position, first working position, and second working position. The four ports are: P port (inlet), T port (return port), A port (first working port), and B port (second working port).

[0023] In the neutral valve position, ports P, T, A, and B are all cut off.

[0024] In the first working valve position, port P is connected to both ports A and B, while port T is cut off.

[0025] In the second working valve position, port T is connected to both ports A and B, while port P is cut off.

[0026] This dual-flow-channel directional valve can be constructed as a proportional valve, meaning that the valve opening depends on the magnitude of the control signal (electrical signal, hydraulic signal, etc.).

[0027] According to a modification, such as Figure 2 As shown, in Figure 1 Based on the dual-flow-channel directional valve shown, connecting port A and port B through external or internal channels will create a single flow channel to supply fluid to the same working device, such as supplying hydraulic oil to a hydraulic actuator, or acting as a pilot valve to supply control oil pressure to a control terminal of the main control valve of the hydraulic system.

[0028] According to a modification, such as Figure 3 As shown, in Figure 1 Based on the dual-channel reversing valve shown, the neutral valve position is modified to allow throttling and connection between ports P, T, A, and B. For Figure 3The modified version shown can further connect ports A and B through external or internal channels to form a single flow channel.

[0029] The following reference Figures 4-8 describe Figure 1 The diagram shows an exemplary structure of a dual-channel directional valve. Figure 4 The image shows the neutral valve position of the dual-channel directional valve. Figure 7 The first operating position of the dual-channel directional valve is shown in the figure. Figure 8 The second working position of the dual-channel directional valve is shown in the figure.

[0030] See Figure 4 The dual-flow directional valve includes a valve body 1 and a single valve core 2 disposed within the valve body 1. Valve position switching is achieved by controlling the position of the valve core 2 within the valve body 1.

[0031] See Figure 5 The valve body 1 defines an axially extending valve chamber 10 for axially slidingly mounting the valve core 2 within the valve chamber 10. The valve body 1 forms a structure extending axially from a first side along the valve chamber 10. Figure 5 (middle left) towards the second side of the axis ( Figure 5 The valve body 1 is divided into four chambers (Ta, P, A, B, and Tb) in a sequential manner (from right to left). Chambers P, A, and B are connected to ports P, A, and B, respectively. Port T is divided into two return ports: Ta and Tb. The Ta and Tb chambers in valve body 1 are connected to ports Ta and Tb, respectively, and are interconnected within valve body 1 via internal channels. The naming convention for these ports and chambers is conventional in the art. In the following description, mentioning connection (or disconnection) to a particular chamber means also connection (or disconnection) to the corresponding port.

[0032] See Figure 6 On the outer periphery of valve core 2, along the first side from the axial direction ( Figure 6 From the left side of the middle to the second side of the axis ( Figure 6 Looking from the right side, the first to fifth oil grooves (cutting grooves) 2a, 2b, 2c, 2d, and 2e are formed sequentially. These oil grooves divide the body of the valve core 2 from the first axial side to the second axial side into the first valve core section 21, the second valve core section 22, the third valve core section 23, the fourth valve core section 24, the fifth valve core section 25, and the sixth valve core section 26.

[0033] See Figure 4 and combined Figure 5 , Figure 6In the neutral position of the dual-flow directional valve, the first oil groove 2a faces the Ta chamber, the second oil groove 2b faces the A chamber, the third oil groove 2c faces the P chamber, the fourth oil groove 2d faces the B chamber, and the fifth oil groove 2e faces the Tb chamber. Each oil chamber is separated by the second valve core section 22, the third valve core section 23, the fourth valve core section 24, and the fifth valve core section 25 of the valve core 2. In this way, the oil ports of the dual-flow directional valve are all disconnected.

[0034] See Figure 7 and combined Figure 5 , Figure 6 The valve core 2 is driven from the first axial side to the second axial side, achieving the first working position of the dual-channel directional valve. In the first working position, the second oil groove 2b connects chamber A and chamber P, and the third oil groove 2c connects chamber B and chamber P. The second valve core section 22 isolates chamber Ta from chamber A, and the fifth valve core section 25 isolates chamber Tb from chamber B. Thus, the P port of the dual-channel directional valve is connected to both port A and port B, allowing fluid to flow from port P to ports A and B.

[0035] See Figure 8 and combined Figure 5 , Figure 6 The valve core 2 is driven from the second axial side to the first axial side, realizing the second working valve position of the dual-channel directional valve. In the second working valve position, the second oil groove 2b connects the A chamber to the Ta chamber, and the fifth oil groove 2e connects the B chamber to the Tb chamber. The third valve core section 23 and the fourth valve core section 24 respectively isolate the P chamber from the A chamber and the B chamber. In this way, the Ta port and Tb port of the dual-channel directional valve are connected to the A port and the B port respectively, and the fluid in the A port and the B port can flow to the Ta port and the Tb port respectively. Of course, there may also be flow in the internal channel between the Ta port and the Tb port inside the valve body 1.

[0036] Back Figure 6 As can be seen, grooves 3 are formed on the side of the second valve core section 22 and the third valve core section 23 facing the second oil groove 2b, respectively. Grooves 3 are also formed on the side of the fourth valve core section 24 facing the third oil groove 2c, and grooves 3 are also formed on the side of the fifth valve core section 25 facing the fifth oil groove 2e. These grooves are beneficial for suppressing flow rate and pressure fluctuations when the valve position is switched.

[0037] Each groove 3 is formed between adjacent oil grooves and valve core sections. The groove 3 has the largest flow area at the interface between the oil groove and the valve core section, and the flow area gradually decreases both as it extends towards the oil groove and as it extends towards the valve core section. This allows for smooth flow rate and pressure changes during valve position switching.

[0038] It can be understood that by forming throttling oil grooves similar to oil grooves 3 on the side of the second valve core section 22 facing the first oil groove 2a, the side of the third valve core section 23 facing the third oil groove 2c, and the sides of the fourth valve core section 24 and the fifth valve core section 25 each facing the fourth oil groove 2d, or even by forming the grooves 3 on the second valve core section 22, the third valve core section 23, the fourth valve core section 24, and the fifth valve core section 25 to have an axial width that runs through each third valve core section, it is possible to... Figure 2 The configuration of the dual-channel directional valve shown has been modified to Figure 3 The configuration shown achieves throttling connection between ports P, T, A, and B in a neutral position.

[0039] The mounting interface of the dual-channel directional valve in this application is as follows: Figure 9 As shown. All oil ports, namely P port, A port, B port, Ta port, and Tb port, are open on this mounting interface. The manifold block for use with this dual-flow-channel directional valve can be installed onto the mounting interface through the threaded hole 12. The corresponding interfaces on the manifold block can be connected to P port, A port, B port, Ta port, and Tb port respectively on this mounting interface.

[0040] exist Figure 9 In this diagram, each port is represented by two circles: the inner circle represents the actual flow hole (circular hole), and the outer circle represents the mounting hole (e.g., a threaded hole). Therefore, the flow area of ​​each port is represented by the area of ​​the inner circle (i.e., the cross-sectional area of ​​the flow hole).

[0041] The flow areas of ports P, A, B, Ta, and Tb are represented as Sp, Sa, Sb, Sta, and Stb, respectively. In the prior art, for a dual-flow-channel directional valve, the flow areas of each port are equal. In this application, considering that if the flow areas of each port are still designed to be equal, then for the second working valve position where port T connects to ports A and B (i.e., ports Ta and Tb are connected to ports A and B respectively), since the flow area of ​​the fluid entering the valve is equal to the flow area of ​​the fluid exiting the valve, there is no problem of excessive pressure drop. However, for the first working valve position where port P connects to ports A and B, since the flow area of ​​the fluid entering the valve is smaller than the flow area of ​​the fluid exiting the valve, there will be a problem of excessive pressure drop. Therefore, this application proposes to increase the flow area of ​​port P on the mounting interface of the dual-flow-channel directional valve to reduce the pressure drop from port P to ports A and B in the first working valve position.

[0042] According to one design scheme, the flow area of ​​port P is set to the sum of the flow areas of ports A and B, i.e., Sp = Sa + Sb. Theoretically, this design scheme can minimize the pressure drop from port P to ports A and B in the first operating valve position. However, in practical designs, this strictness is not always necessary; as long as Sp > 0.5 * (Sa + Sb), it is sufficient. To ensure the pressure drop suppression effect, Sp > 0.8 * (Sa + Sb) can be selected. However, if the flow area of ​​port P exceeds the sum of the flow areas of ports A and B by too much, it may lead to excessively high flow velocities at ports A and B, resulting in further pressure drops. Therefore, an upper limit can be set for the flow area of ​​port P, for example, Sp < 1.2 * (Sa + Sb).

[0043] Furthermore, in order to avoid making too many modifications to the traditional installation interface of the reversing valve, the flow areas of ports A, B, Ta, and Tb can be designed to be equal to each other, i.e., Sa = Sb = Sta = Stb.

[0044] In one specific design, the diameters of ports A, B, Ta, and Tb are approximately 11 mm, and the diameter of port P is approximately 15.6 mm. Thus, Sp = Sa + Sb = Sta + Stb, which is approximately 190 mm. 2 .

[0045] Furthermore, to make the mounting interface of the dual-flow-channel directional valve of this application easier to mate with conventional manifold blocks, the distribution of each oil port follows the distribution in conventional mounting interfaces, such as... Figure 10 As shown. Ports A and B are located in the middle of the longitudinal direction and are arranged horizontally. Port P is located on the first longitudinal side of ports A and B. Figure 10 (Upper middle side). Ta and Tb ports are located on the second longitudinal side of ports A and B. Figure 10 (lower middle side), and arranged horizontally left and right. The position of the P port set in this application (in the lower middle side) is... Figure 10 (Represented by solid lines) Cover as much as possible the P-port in the traditional installation interface (in Figure 10 The position of the P port (indicated by dashed lines) is shown in the diagram. For example, the lateral position of the P port in this application remains unchanged (located in the lateral center position), while its longitudinal position is offset towards the first longitudinal side relative to the P port on the conventional mounting interface. The innermost longitudinal point X of the P port mounting hole in this application coincides with the innermost longitudinal point of the P port mounting hole on the conventional mounting interface. In this way, the mounting interface of the dual-flow-channel directional valve of this application can be easily matched with conventional manifold blocks (especially standard manifold blocks commonly found in the market).

[0046] According to the dual-flow-channel directional valve of this application, by designing a connection path between the two working ports inside the valve, both working ports can be simultaneously supplied or returned with oil. The flow area of ​​the inlet is optimized relative to the flow areas of the two working ports, increasing the inlet flow area and reducing the inlet flow velocity, thereby reducing pressure loss, lowering energy consumption, and suppressing fluid flow noise. Furthermore, it improves the valve's response speed, enhances the performance of equipment using the dual-flow-channel directional valve, and optimizes the equipment's cycle time.

[0047] While this application has been described herein with reference to specific exemplary embodiments, the scope of this application is not limited to the details shown. Various modifications may be made to these details without departing from the basic principles of this application.

Claims

1. A dual-channel directional valve, comprising: A valve body (1) defining a valve chamber (10) and having a mounting interface (11) having an oil inlet (P), a first working oil port (A), a second working oil port (B), and an oil return port (Ta, Tb); and The valve core (2) is installed in the valve chamber (10) and is axially slidable to define the neutral valve position, the first working valve position and the second working valve position of the dual-flow reversing valve; The valve body (1) and valve core (2) are configured such that, in the first working valve position, the oil inlet (P) is connected to the first working oil port (A) and the second working oil port (B) respectively, and the oil return port (Ta, Tb) is cut off; in the second working valve position, the oil inlet (P) is cut off, and the first working oil port (A) and the second working oil port (B) are connected to the oil return port (Ta, Tb) respectively. The flow area of ​​the oil inlet (P) is greater than 0.5 times the sum of the flow areas of the first working oil inlet (A) and the second working oil inlet (B).

2. The dual-channel directional valve as described in claim 1, characterized in that, The flow area of ​​the oil inlet (P) is greater than 0.8 times the sum of the flow areas of the first working oil inlet (A) and the second working oil inlet (B).

3. The dual-channel directional valve as described in claim 1, characterized in that, The flow area of ​​the oil inlet (P) is less than 1.2 times the sum of the flow areas of the first working oil inlet (A) and the second working oil inlet (B).

4. The dual-channel directional valve as described in claim 1, characterized in that, The flow area of ​​the oil inlet (P) is equal to the sum of the flow areas of the first working oil inlet (A) and the second working oil inlet (B).

5. The dual-channel directional valve as described in claim 4, characterized in that, The first working oil port (A) and the second working oil port (B) are circular holes with a diameter of approximately 11 mm, and the oil inlet (P) is a circular hole with a diameter of approximately 15.6 mm.

6. The dual-channel directional valve as described in any one of claims 1-5, characterized in that, The oil return ports (Ta, Tb) include a first oil return port (Ta) and a second oil return port (Tb), and the flow areas of the first working oil port (A), the second working oil port (B), the first oil return port (Ta), and the second oil return port (Tb) are equal.

7. The dual-channel directional valve as described in claim 6, characterized in that, The second working oil port (B) and the first return oil port (Ta) are distributed in the longitudinal middle of the installation interface (11). The oil inlet (P) is set on the installation interface (11) on the first longitudinal side of the first working oil port (A) and the second working oil port (B). The first return oil port (Ta) and the second return oil port (Tb) are set on the installation interface (11) on the second longitudinal side of the first working oil port (A) and the second working oil port (B).

8. The dual-channel directional valve as described in claim 6, characterized in that, The oil inlet (P) is located at the horizontal center position on the mounting interface (11).

9. The dual-channel directional valve as described in any one of claims 1-5, characterized in that, The valve body (1) and valve core (2) are further configured such that, in the neutral valve position, the oil inlet (P), the first working oil port (A), the second working oil port (B), and the oil return port (Ta, Tb) are all cut off.

10. The dual-channel directional valve as described in any one of claims 1-5, characterized in that, The valve body (1) and valve core (2) are further configured such that, in the neutral valve position, the oil inlet (P), the first working oil port (A), the second working oil port (B), and the oil return port (Ta, Tb) are throttled and connected.

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