Plug-in mounting type combined overflow valve

Abstract

The invention relates to a plug-in type combined overflow valve which comprises N overflow valves connected in sequence, the overflow valves are connected through threads on an end cover and a valve body, overall installation is facilitated, a first overflow valve-N-1 overflow valve element comprises a valve element base body and a baffle ring, and the baffle ring is connected with the valve element base body in a welding or interference press-in mode. The sealing ring is installed in an annular groove formed by the valve element base body and the baffle ring, and the sealing gasket is installed in the Nth valve element annular groove. The sealing ring and the sealing gasket are used for sealing the valve port, the sealing reliability of the valve port can be improved, the zero-leakage effect is achieved, and the sealing ring can be conveniently replaced when losing efficacy. One end of the valve element of the first overflow valve is designed to be of a split structure, the guide length of the valve element is guaranteed, and meanwhile the through-flow area from the oil port 1 to the oil port 2 is increased.

Description

Technical Field

[0001] The invention belongs to the field of civil aviation landing gear front wheel turning system, and in particular relates to a plug-in combined overflow valve. Background Art

[0002] Most of the existing combined overflow valves are multiple overflow valves installed on one valve block, such as the patent "A combined overflow valve and an off-vehicle multi-way valve with the combined overflow valve" (CN215110664U). This patent installs multiple overflow valves in one valve block, and then communicates through the flow channel in the valve block to finally form a combined overflow valve function. Although this method is simple in principle and easy to assemble, it has a large structural size and weight, a complex internal flow channel, and is difficult to process. It is not suitable for use in aerospace and other occasions that have high requirements on the size and weight of the combined overflow valve. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide a plug-in combined overflow valve, which is connected by threads for easy overall installation; a sealing ring and a sealing gasket are used to seal the valve port, which can not only improve the reliability of the valve port sealing and achieve a zero leakage effect, but also can be conveniently replaced when the sealing ring fails.

[0004] The above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:

[0005] A plug-in combined relief valve comprises N relief valves connected in sequence, wherein the i-th relief valve comprises the i-th valve body, the i-th valve core, the i-th spring and the i-th end cover, the i-th valve core is installed in the i-th valve body, the i-th spring presses the i-th valve core, and the i-th end cover is screwed in so that the i-th valve core closes the valve port under the action of the i-th spring; the i-th end cover and the i-th valve body are respectively provided with threaded structures, the i-th end cover is threadedly connected to the i+1-th valve body, the 1st valve core to the N-1th valve core comprise a valve core base and a retaining ring, and the retaining ring is connected to the valve core base; the 1st relief valve to the N-1th relief valve comprise a sealing ring, which is installed in an annular groove formed by the valve core base and the retaining ring, and the outermost N-th relief valve comprises a sealing gasket, which is arranged in the annular groove of the N-th valve core, i∈N, i and N are both positive integers.

[0006] The end of the first valve core (2) away from the second overflow valve is a petal structure, and the petal structure is a columnar structure composed of m symmetrical planes and m arc surfaces, and two adjacent planes are connected by arc surfaces. The value of m is 3-5.

[0007] The ratio of the limiting width b of the sealing ring formed by the valve core and the retaining ring to the width a of the valve core sealing groove is b / a=1 / 3 to 1 / 2.

[0008] The Nth valve body 9 is provided with a protruding annular structure 16 , which contacts with the sealing gasket 15 to complete the sealing.

[0009] The width c of the protruding annular structure 16 is 0.5-1.5 mm.

[0010] One end of the nth valve core contacts the n+1th valve core, and when the nth valve core moves, it drives the n+1th valve core to move, and the value range of n is 1 to N-2.

[0011] The retaining ring and the valve core base are connected by welding or interference fit.

[0012] The value of N is 3-6.

[0013] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:

[0014] (1) The relief valve of the present invention is connected in sequence with the threads on the end cover and the valve body to form a plug-in combined relief valve, which is convenient for overall installation, simplifies the structural dimensions, and reduces the overall weight of the structure.

[0015] (2) One end of the first valve core of the present invention preferably adopts a split-petal structure design, which not only ensures the guide length of the valve core, but also increases the flow area from oil port 1 to oil port 2.

[0016] (3) The present invention uses a sealing ring and a sealing gasket to seal the valve port, which can not only improve the reliability of the valve port sealing and achieve a zero leakage effect, but also allow for convenient replacement of the sealing ring when it fails.

[0017] (4) In the present invention, one end of the i-th valve core contacts the (i+1)-th valve core, so that the movement of the i-th valve core can drive the movement of the (i+1)-th valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of the structure of the cartridge-type combined relief valve according to Embodiment 1 of the present invention;

[0019] Figure 2 This is a structural diagram of the first relief valve of the plug-in combined relief valve of Example 1 of the present invention;

[0020] Figure 3 This is a structural diagram of the second relief valve of the plug-in combined relief valve of Example 1 of the present invention;

[0021] Figure 4 This is a structural diagram of the third relief valve of the plug-in combined relief valve of Example 1 of the present invention;

[0022] Figure 5 This is a structural diagram of the first valve core of the cartridge-type combined relief valve according to Example 1 of the present invention;

[0023] Figure 6 This is a cross-sectional view of the first valve core of the cartridge-type combined relief valve according to Example 1 of the present invention;

[0024] Figure 7 This is a structural diagram of the valve port of the third relief valve of the plug-in combined relief valve in Example 1 of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] Example 1

[0027] In this embodiment, the number of overflow valves is 3, that is, N=3. Figure 1 The figure shows the structural cross-section of the cartridge-type combined relief valve. Figure 2 The figure shows the structure of the first overflow valve. Figure 3 The figure shows the structure of the second overflow valve. Figure 4 The figure shows the structure of the third overflow valve. It can be seen from the figure that the plug-in combined overflow valve of the present invention includes a first overflow valve, a second overflow valve and a third overflow valve. The first overflow valve includes a first valve body 1, a first valve core 2, a first spring 3, a first end cover 4 and a first sealing ring 13. The second overflow valve includes a second valve body 5, a second valve core 6, a second spring 7, a second end cover 8 and a second sealing ring 14. The third overflow valve includes a third valve body 9, a third valve core 10, a third spring 11, a third end cover 12 and a sealing gasket 15.

[0028] The first valve body 1, the first end cover 4, the second valve body 5, the second end cover 8, the third valve body 9, and the third end cover 12 are respectively provided with threaded structures, the first end cover 4 is threadedly connected with the second valve body 5, and the second end cover 8 is threadedly connected with the third valve body 9 to form a combined structure. The threaded structures on the first valve body 1 and the third end cover 12 can also be further combined to connect other overflow valves.

[0029] The first valve core 2 is installed in the first valve body 1, and then the first spring 3 is installed to compress the first valve core 2, and finally the first end cover 4 is screwed in, so that the first valve core 2 closes the valve port under the action of the first spring 3. The opening pressure of the first relief valve is set by the first spring, and the valve port is reliably sealed by the first sealing ring in contact with the first valve body.

[0030] The second valve core 6 is installed in the second valve body 5, and then the second spring 7 is installed to compress the second valve core 6, and finally the second end cover 8 is screwed in, so that the second valve core 6 closes the valve port under the action of the second spring 7. The opening pressure of the second relief valve is set by the second spring 7, and the valve port is reliably sealed by the second sealing ring in contact with the second valve body 5.

[0031] The third valve core 10 is installed in the third valve body 9, and then the third spring 11 is installed to press the third valve core 10, and finally the third end cover 12 is screwed in, so that the third valve core 10 closes the valve port under the action of the third spring 11. The opening pressure of the third relief valve is set by the third spring 11, and the valve port is in contact with the third valve body 9 by the sealing gasket to form a reliable seal.

[0032] When the oil inlet pressure of port 1 reaches the opening pressure of the first relief valve, the first relief valve opens, the first valve core moves to the left, and the second valve core moves to the left at the same time, and the second relief valve opens; when oil is passed through port 1, port 1 is connected with port 2, and port 3 is connected with port 4. When oil enters port 3, the second relief valve opens. After the second relief valve opens, the oil will reach the front end of the third valve core, causing the third relief valve to open. At this time, the pressure of port 4 can be increased, that is, the return oil pressure of the second relief valve.

[0033] like Figure 5 The figure shows the schematic diagram of the first valve core structure when m=3. The end of the first valve core away from the second relief valve is a petal structure, which is a columnar structure composed of three symmetrical planes and three arc surfaces, and the arc surfaces connect two adjacent planes. Figure 6 The figure shows a structural cross-sectional view of the first valve core, which is composed of a valve core base 201 and a retaining ring 202. The retaining ring 202 is integrated with the valve core base 201 by welding or interference press-fitting, and the sealing ring 13 is installed in the ring groove formed by the valve core base 201 and the retaining ring 202. The first sealing ring 13 contacts the first valve body to form a seal. The ratio range of the limiting width b of the sealing ring formed by the first valve core and the retaining ring and the width a of the sealing groove of the first valve core of the present invention is b / a=1 / 3~1 / 2. The sealing part of the second valve core has the same structure as the first valve core.

[0034] like Figure 7 The third overflow valve port structure is shown, the sealing gasket 15 is installed in the annular groove of the third valve core 10, and the third valve body 9 has a protruding annular structure 16, which contacts the sealing gasket 15 to form a reliable seal. The width c of the protruding annular structure 16 on the third valve body 9 of the present invention ranges from 0.5mm to 1.5mm.

[0035] One end of the first valve core is in contact with the second valve core, so that the movement of the first valve core can drive the second valve core to move.

[0036] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

[0037] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A cartridge-type combined relief valve, characterized in that: The invention comprises N relief valves connected in sequence, wherein the i-th relief valve comprises the i-th valve body, the i-th valve core, the i-th spring and the i-th end cover, the i-th valve core is installed in the i-th valve body, the i-th spring presses the i-th valve core, and the i-th end cover is screwed in so that the i-th valve core closes the valve port under the action of the i-th spring; the i-th end cover and the i-th valve body are respectively provided with threaded structures, the i-th end cover is threadedly connected with the i+1-th valve body, the 1-th valve core to the N-1-th valve core comprises a valve core base and a retaining ring, and the retaining ring is connected with the valve core base; the 1-th relief valve to the N-1-th relief valve comprises a sealing ring, which is installed in an annular groove formed by the valve core base and the retaining ring, and the outermost N-th relief valve comprises a sealing gasket (15), which is arranged in an annular groove of the N-th valve core (10), i∈N, i and N are both positive integers.

2. The cartridge-type combined relief valve according to claim 1, characterized in that: The end of the first valve core (2) away from the second overflow valve is a petal structure, and the petal structure is a columnar structure composed of m symmetrical planes and m arc surfaces, and two adjacent planes are connected by arc surfaces.

3. The cartridge-type combined relief valve according to claim 2, characterized in that: m is 3-5.

4. The cartridge-type combined relief valve according to claim 1, characterized in that: The ratio of the limiting width b of the sealing ring formed by the valve core and the retaining ring to the width a of the valve core sealing groove is b / a=1 / 3 to 1 / 2.

5. The cartridge-type combined relief valve according to claim 1, characterized in that: The Nth valve body (9) is provided with a protruding annular structure (16), and the protruding annular structure (16) contacts the sealing gasket (15) to complete the sealing.

6. The cartridge-type combined relief valve according to claim 5, characterized in that: The width c of the protruding annular structure (16) is 0.5 to 1.5 mm.

7. The cartridge-type combined relief valve according to claim 1, characterized in that: One end of the nth valve core contacts the n+1th valve core, and when the nth valve core moves, it drives the n+1th valve core to move, and the value range of n is 1 to N-2.

8. The cartridge-type combined relief valve according to claim 1, characterized in that: The retaining ring is connected to the valve core base by welding or interference fit.

9. The cartridge-type combined relief valve according to claim 1, characterized in that: N is a value between 3 and 6.

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