Bridge type connection bidirectional self-sealing pressure filter

Abstract

The utility model belongs to the technical field of pressure filters, and relates to a bridge-type connection two-way self-sealing pressure filter, which comprises a casing provided with a medium cavity, a filter element is mounted in the medium cavity, and a self-sealing valve seat is connected onto the casing; a convex part is formed in the self-sealing valve seat, a first inlet / outlet and a second inlet / outlet are formed in the valve seat body, a middle channel is formed in the convex part, and one end of the middle channel is communicated with the liquid outlet end of the filter element; the first inlet and outlet is communicated with the middle channel through a first self-sealing valve; the second inlet and outlet is communicated with the middle channel through a second self-sealing valve; the first inlet and outlet is communicated with the medium cavity through a third self-sealing valve; and the second inlet and outlet is communicated with the medium cavity through a fourth self-sealing valve. After the structure is adopted, the oil filter has the beneficial effects that the problem that oil liquid of a common filter can only flow and be filtered in a one-way direction is solved, pipelines of a system are simplified, the space is saved, and the arrangement of the system is more compact.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure filters, in particular to a bridge-type connected bidirectional self-sealing pressure filter. Background Art

[0002] Pressure filters are mainly installed in the downstream pipeline system of hydraulic pumps. They use mineral oil or synthetic oil as the medium to filter it. There is a great risk when a new hydraulic device is put into operation for the first time. There are similar problems in the protection of valves and hydraulic cylinders. Because the flow direction of the oil often changes between these components. Since the oil is thick, it needs to be pressurized when filtering so that the oil can pass through the filter element smoothly. This is because the impurities left by a hydraulic component during manufacturing or assembly lead to functional failure or complete damage to another component. Because it is actually impossible to completely eliminate these impurities, especially in large devices.

[0003] In the hydraulic system, the direction of liquid flow changes rapidly or stops flowing, forming hydraulic shock. Therefore, filters must be installed between these vulnerable components to eliminate these factors. At this time, filters that can effectively filter in both flow directions are needed, especially when it is related to protecting the more expensive hydraulic cylinders, which is an indispensable component.

[0004] Traditional pressure filters only allow one-way flow, and the oil cannot flow in the opposite direction. Otherwise, the impurities filtered out will be flushed out of the filter element, causing secondary pollution. Even when the impurities are seriously blocked, the greater the pressure difference between the inside and outside of the filter element, the greater the damage to the filter element. Traditional pressure filters have certain shortcomings when used. They do not have a reverse auxiliary structure for docking, which limits the application of high-pressure filters and reduces their flexibility and extensiveness of use. Therefore, it is necessary to improve them. Utility Model Content

[0005] In order to solve the above problems in the prior art, the utility model provides a bridge-type bidirectional self-sealing pressure filter, which solves the problem that the oil in a general filter can only flow and filter in one direction, simplifies the system pipeline, saves space, and makes the system layout more compact.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] As one aspect of the utility model, a bridge-type bidirectional self-sealing pressure filter is provided, which comprises: a housing, the housing having a medium cavity, one end of the housing being closed, and the other end of the housing being open; a filter element being installed in the medium cavity, the open end of the housing being connected to a self-sealing valve seat, and the self-sealing valve seat presses the filter element into the medium cavity;

[0008] The self-sealing valve seat comprises a valve seat body, a mounting groove is provided on the valve seat body, and the self-sealing valve seat is detachably connected to the open end of the housing through the mounting groove; a convex portion is formed in the mounting groove, and the convex portion is connected to the top of the filter element; the valve seat body is provided with a first inlet and a second inlet,

[0009] An intermediate channel is provided in the convex portion, one end of the intermediate channel is communicated with the liquid outlet end of the filter element, and the other end of the intermediate channel is a blind end;

[0010] The first inlet and outlet are connected to the middle channel through a first self-sealing valve; the second inlet and outlet are connected to the middle channel through a second self-sealing valve;

[0011] The first inlet and outlet are connected to the medium cavity through the third self-sealing valve; the second inlet and outlet are connected to the medium cavity through the fourth self-sealing valve.

[0012] Optionally, the first inlet and outlet are connected to the middle channel through a first channel, and the second inlet and outlet are connected to the middle channel through a second channel;

[0013] The first inlet and outlet are connected to the medium cavity through the third channel, and the second inlet and outlet are connected to the medium cavity through the fourth channel;

[0014] The first channel is provided with a first self-sealing valve, the second channel is provided with a second self-sealing valve, the third channel is provided with a third self-sealing valve, and the fourth channel is provided with a fourth self-sealing valve.

[0015] Optionally, the structures of the first self-sealing valve, the second self-sealing valve, and the fourth self-sealing valve are all the same as the structure of the third self-sealing valve; the third self-sealing valve comprises a self-sealing valve body, the self-sealing valve body is arranged in a self-sealing valve seat, a second elastic member is connected to the self-sealing valve body, and the other end of the second elastic member is connected to the self-sealing valve valve.

[0016] Optionally, a bypass valve is connected to the bottom of the filter element.

[0017] Optionally, the bypass valve includes a bypass valve seat connected to the filter element, the bypass valve seat is provided with a connecting hole, the interior of the filter element is connected with the cavity of the filter shell through the connecting hole, and the bypass valve seat is connected to a bypass valve valve through a first elastic member. Under normal circumstances, the bypass valve valve blocks the connecting hole through the first elastic member.

[0018] Optionally, a polytetrafluoroethylene retaining ring is provided between the shell and the mounting groove.

[0019] Optionally, a radial sealing ring is provided between the housing and the mounting groove.

[0020] Optionally, the first inlet and outlet and the second inlet and outlet are symmetrically arranged about the center of the valve seat body.

[0021] The beneficial effects of the bridge-type bidirectional self-sealing pressure filter of the utility model are specifically embodied in that: the bridge-type bidirectional self-sealing pressure filter of the utility model has advantages; the first self-sealing valve that controls the flow from the inlet to the filter element is immediately followed by a second self-sealing valve, and the second self-sealing valve leaves a flow gap between the self-sealing valve seat and the valve to prevent the oil from flowing back to the inlet. Similarly, in the direction of the reverse flow of the oil, another third self-sealing valve and a fourth self-sealing valve are provided. In this way, a bridge-type connection is formed, which has the function of bidirectional self-sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of the bridge-type bidirectional self-sealing pressure filter of the utility model. Figure 1 ;

[0024] Figure 2 for Figure 1 Partial schematic diagram at point A in the middle;

[0025] Figure 3 This is a schematic diagram of the structure of the bridge-type bidirectional self-sealing pressure filter of the utility model. Figure 2 . DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] A bridge-connected bidirectional self-sealing pressure filter according to an embodiment of the present application, such as Figure 1-Figure 3 As shown, it comprises: a shell 1, the shell 1 has a medium cavity 11, one end of the shell 1 is closed, and the other end of the shell 1 is open;

[0028] A filter element 2 is installed in the medium cavity 11. The filter element 2 is made of Glass fiber filter material. The filter element 2 has a precision of 5μm or 25μm and a bursting pressure of 20bar or 160bar. It has high filtering precision, large oil flow capacity, small original pressure loss, and large dirt holding capacity. In addition, a paper filter element with a precision of 10μm and 25μm can also be used, and its bursting pressure is 20bar. The structure of the filter element 2 is prior art and will not be described here. The open end of the housing 1 is connected to a self-sealing valve seat 3, which presses the filter element into the medium cavity 11.

[0029] The self-sealing valve seat 3 comprises a valve seat body 31, a mounting groove 32 is provided on the valve seat body 31, and the self-sealing valve seat 3 is detachably connected to the open end of the housing 1 through the mounting groove 32; a convex portion 33 is formed in the mounting groove 32, and the convex portion 33 is connected to the top of the filter element 2; a first inlet and outlet 34 and a second inlet and outlet 35 are provided on the valve seat body 31, and the first inlet and outlet 34 and the second inlet and outlet 35 are symmetrically arranged around the center of the valve seat body 31;

[0030] The convex portion 33 has an intermediate channel 36, one end of which is connected to the liquid outlet of the filter element 2, and the other end of the intermediate channel 36 is a blind end.

[0031] The first inlet and outlet 34 is connected to the middle channel 36 through the first channel 37, and the second inlet and outlet 35 is connected to the middle channel 36 through the second channel 38;

[0032] The first inlet and outlet 34 is connected to the medium cavity 11 through the third channel 39, and the second inlet and outlet 35 is connected to the medium cavity 11 through the fourth channel 310;

[0033] The first channel 37 is provided with a first self-sealing valve 311, the second channel 38 is provided with a second self-sealing valve 312, the third channel 39 is provided with a third self-sealing valve 313, and the fourth channel 310 is provided with a fourth self-sealing valve 314.

[0034] When the medium enters from the first inlet and outlet 34, under the pressure of the medium, the first self-sealing valve 311 blocks the first inlet and outlet 34 and the intermediate channel 36, the fourth self-sealing valve 314 blocks the second inlet and outlet 35 and the medium chamber 11, the third self-sealing valve 313 and the second self-sealing valve 312 are in an open state, the medium enters the medium chamber 11 from the third self-sealing valve 313, passes through the intermediate channel 36 after being filtered by the filter element 2, and then flows out from the second inlet and outlet 35. Figure 1 and Figure 2 As shown;

[0035] When the medium enters from the second inlet and outlet 35, under the pressure of the medium, the second self-sealing valve 312 blocks the second inlet and outlet 35 and the intermediate channel 36, the third self-sealing valve 313 blocks the first inlet and outlet 34 and the medium chamber 11, the fourth self-sealing valve 314 and the first self-sealing valve 311 are in an open state, the medium enters the medium chamber 11 from the fourth self-sealing valve 314, enters the first self-sealing valve 311 through the intermediate channel 36 after being filtered by the filter element 2, and then flows out from the first inlet and outlet 34. Figure 3 As shown; a self-sealing valve is provided to ensure the directionality of oil flow and prevent oil backflow.

[0036] In one embodiment, if Figure 1 and Figure 2 As shown, the structures of the first self-sealing valve 311, the second self-sealing valve 312, and the fourth self-sealing valve 314 are all the same as the third self-sealing valve 313;

[0037] The third self-sealing valve 313 includes a self-sealing valve body 3131, which is arranged in the self-sealing valve seat 3. The self-sealing valve body 3131 is connected to a second elastic member 3132, and the other end of the second elastic member 3132 is connected to a self-sealing valve valve 3133, which is used in conjunction with a corresponding channel.

[0038] In one embodiment, if Figure 1 As shown, a bypass valve 4 is connected to the bottom of the filter element 2, and the bypass valve 4 includes a bypass valve seat 41 connected to the filter element 2. A connecting hole is provided on the bypass valve seat 41. The interior of the filter element 2 is connected to the cavity of the filter housing 1 through the connecting hole. A bypass valve valve 43 is connected to the bypass valve seat 41 through a first elastic member 42. Under normal conditions, the bypass valve valve 43 blocks the connecting hole through the first elastic member 42; as an example, the first elastic member 42 is a compression spring; when starting with cold oil, or when the filter cannot work normally due to excessive pressure difference caused by other factors such as too low system oil temperature, and when the filter is blocked by contaminants, the first elastic member 42 is compressed, and the bypass valve connected in parallel at the bottom of the lower end cover of the filter element will automatically open, and the opening pressure difference is 6 bar, ensuring the normal operation of the filter element and the system.

[0039] In one embodiment, an electrical differential pressure switch or an optical differential pressure indicator is installed on the shell, which has a signal transmitting device. When the filter element is blocked, the signal transmitter transmits a signal with a signal value of 5 bar, promptly reminding the user to replace the filter element. The signal transmitting device is a prior art and will not be described in detail here.

[0040] In one embodiment, if Figure 1 As shown, a polytetrafluoroethylene retaining ring 5 and / or a radial sealing ring 6 are provided between the housing 1 and the mounting groove 32 to enhance the sealing performance of the two.

[0041] In this embodiment, by installing a bridge-type bidirectional self-sealing pressure filter on the main pipe between the hydraulic pump and the hydraulic motor, pump damage caused by the motor (or motor damage caused by the pump) can be reliably avoided; the bridge-type bidirectional self-sealing pressure filter of the present application has advantages; the first self-sealing valve that mainly controls the flow from the inlet to the filter element is immediately followed by a second self-sealing valve, and the second self-sealing valve leaves a flow gap between the self-sealing valve seat and the valve to prevent the oil from flowing back to the inlet. Similarly, in the direction of the reverse flow of the oil, another third self-sealing valve and a fourth self-sealing valve are provided. In this way, a bridge connection is formed, which has the function of bidirectional self-sealing.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0044] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A bridge-connected bidirectional self-sealing pressure filter, characterized in that: It includes: A housing, wherein the housing has a medium cavity, one end of the housing is closed, and the other end of the housing is open; a filter element is installed in the medium cavity, and a self-sealing valve seat is connected to the open end of the housing, and the self-sealing valve seat presses the filter element into the medium cavity; The self-sealing valve seat comprises a valve seat body, a mounting groove is provided on the valve seat body, and the self-sealing valve seat is detachably connected to the open end of the housing through the mounting groove; a convex portion is formed in the mounting groove, and the convex portion is connected to the top of the filter element; the valve seat body is provided with a first inlet and a second inlet, An intermediate channel is provided in the convex portion, one end of the intermediate channel is communicated with the liquid outlet end of the filter element, and the other end of the intermediate channel is a blind end; The first inlet and outlet are connected to the middle channel through a first self-sealing valve; the second inlet and outlet are connected to the middle channel through a second self-sealing valve; The first inlet and outlet are connected to the medium cavity through the third self-sealing valve; the second inlet and outlet are connected to the medium cavity through the fourth self-sealing valve.

2. The bridge-connected bidirectional self-sealing pressure filter according to claim 1, characterized in that: The first inlet and outlet are connected to the middle channel through the first channel, and the second inlet and outlet are connected to the middle channel through the second channel; The first inlet and outlet are connected to the medium cavity through the third channel, and the second inlet and outlet are connected to the medium cavity through the fourth channel; The first channel is provided with a first self-sealing valve, the second channel is provided with a second self-sealing valve, the third channel is provided with a third self-sealing valve, and the fourth channel is provided with a fourth self-sealing valve.

3. The bridge-connected bidirectional self-sealing pressure filter according to claim 1, characterized in that: The structures of the first self-sealing valve, the second self-sealing valve and the fourth self-sealing valve are all the same as the structure of the third self-sealing valve; the third self-sealing valve comprises a self-sealing valve body, the self-sealing valve body is arranged in a self-sealing valve seat, a second elastic member is connected to the self-sealing valve body, and the other end of the second elastic member is connected to the self-sealing valve valve.

4. The bridge-connected bidirectional self-sealing pressure filter according to claim 1, characterized in that: The bottom of the filter element is connected with a bypass valve.

5. The bridge-connected bidirectional self-sealing pressure filter according to claim 4, characterized in that: The bypass valve includes a bypass valve seat connected to the filter element, the bypass valve seat is provided with a connecting hole, the interior of the filter element is connected to the cavity of the filter shell through the connecting hole, and the bypass valve seat is connected to a bypass valve valve through a first elastic member. Under normal circumstances, the bypass valve valve blocks the connecting hole through the first elastic member.

6. The bridge-connected bidirectional self-sealing pressure filter according to claim 1, characterized in that: A polytetrafluoroethylene retaining ring is arranged between the shell and the mounting groove.

7. The bridge-connected bidirectional self-sealing pressure filter according to claim 1 or 6, characterized in that: A radial sealing ring is arranged between the housing and the mounting groove.

8. The bridge-connected bidirectional self-sealing pressure filter according to claim 1, characterized in that: The first inlet and outlet and the second inlet and outlet are symmetrically arranged about the center of the valve seat body.

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