Emulsion pump unloading valve with anti-cavitation structure

Abstract

The utility model relates to the technical field of liquid pump corollary equipment, in particular to an emulsion pump unloading valve with an anti-cavitation structure, which comprises a valve sleeve and an unloading valve core, a first liquid passing hole, a second liquid passing hole and a third liquid passing hole are formed in the valve sleeve, the third liquid passing hole is communicated with the second liquid passing hole, and a sealing piece is arranged between the second liquid passing hole and the third liquid passing hole; the unloading valve element is movably arranged in the valve sleeve, and a flow guide groove is formed in the unloading valve element. A drainage hole is formed in the unloading valve element, one end of the drainage hole communicates with the first liquid passing hole, and the sealing piece can seal the other end of the drainage hole. When the unloading valve element is in an unloading state, the first liquid passing hole communicates with the second liquid passing hole, the flow guide groove guides the emulsified liquid at the position of the second liquid passing hole, and the other end of the drainage hole moves to communicate with the third liquid passing hole. According to the unloading valve with the anti-cavitation structure for the emulsion pump, by means of the structure, cavitation damage can be effectively reduced, the reliability of the unloading valve is improved, and the service life of the unloading valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid pump supporting equipment, in particular to an unloading valve for an emulsion pump with an anti-cavitation structure. Background Art

[0002] The unloading valve is a pressure control device for an emulsion pumping station. It has the characteristics of good dynamic characteristics, high safety, energy saving and high efficiency. It can realize flexible control of system pressure. Its performance directly affects the normal operation of the pumping station and the integrated liquid supply system and the safety of personnel. With the continuous increase in the height of the working face and the popularization and promotion of intelligent mining, higher and higher requirements are placed on the stability and reliability of the pumping station liquid supply system. At present, most of the existing mainstream unloading valves adopt a conical sealing structure formed by a cylindrical valve core and a valve seat.

[0003] The valve body structure designed in the prior art has the following three main disadvantages:

[0004] 1. The valve body structure is complex, with too many parts and components, making installation inconvenient;

[0005] 2. During use, cavitation damage is serious, service life is short, and reliability is poor;

[0006] 3. Affected by back pressure, the valve core of the unloading unit closes more slowly and the overall dynamic response becomes worse. Utility Model Content

[0007] The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure, which is used to solve the defects of severe cavitation damage, short service life and poor reliability in the background technology.

[0008] The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure, comprising:

[0009] A valve sleeve, wherein the valve sleeve is formed with a first liquid passage hole, a second liquid passage hole and a third liquid passage hole, the third liquid passage hole is communicated with the second liquid passage hole, and a sealing member is provided between the second liquid passage hole and the third liquid passage hole;

[0010] An unloading valve core, wherein the unloading valve core is movably disposed in the valve sleeve, a guide groove is formed at the first end of the unloading valve core; a drainage hole is formed inside the unloading valve core, the drainage hole communicates with the first end of the unloading valve core and the second end of the unloading valve core, one end of the drainage hole is communicated with the first liquid hole, and the sealing member can seal the other end of the drainage hole;

[0011] When the unloading valve core is in the unloading state, the first liquid hole is connected to the second liquid hole, the guide groove guides the emulsion at the position of the second liquid hole, and the other end of the drainage hole moves to be connected to the third liquid hole.

[0012] According to the unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model, the sealing element comprises:

[0013] a first sealing groove, wherein the first sealing groove is disposed in the valve sleeve;

[0014] a first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring seal the first sealing groove to form a sealing cavity;

[0015] When the unloading valve core is in a non-unloading state, the other end of the drainage hole is sealed by the sealing cavity.

[0016] The unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model further includes: a second sealing groove, wherein the second sealing groove is arranged in the valve sleeve and placed in the second liquid passage hole.

[0017] The unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model further includes: an unloading spring, one end of which is fixedly connected to one end of the valve sleeve, and the other end of which is connected to the unloading valve core.

[0018] The unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model also includes:

[0019] A connecting piece, the connecting piece is connected between the other end of the unloading spring and the unloading valve core;

[0020] A third sealing groove is arranged in the valve sleeve and close to the end of the connecting member.

[0021] The unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model further includes: a third sealing ring, wherein the third sealing ring is arranged in the third sealing groove.

[0022] According to the unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model, the guide groove is an annular groove, and the annular groove is arranged at one end close to the first liquid passage hole.

[0023] According to the unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model, the drainage hole is a T-shaped hole, the T-shaped hole passes through the unloading valve core, the vertical end of the T-shaped hole is connected to the first liquid hole, and through the movement of the unloading valve core, the horizontal end of the T-shaped hole can be moved to be connected to the third liquid hole.

[0024] According to the unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model, the valve sleeve is also formed with a fourth liquid passage hole; the unloading valve for an emulsion pump with an anti-cavitation structure also includes: a one-way valve core, which is movably arranged in the valve sleeve and is arranged close to the fourth liquid passage hole.

[0025] The unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model further includes: a one-way valve spring, one end of which is fixedly connected to the other end of the valve sleeve, and the other end of the one-way valve spring is connected to the one-way valve core.

[0026] The unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model also includes: a valve body and a mechanical pressure regulating valve, an electromagnetic pilot valve and a valve core string assembled on the valve body, and the valve sleeve and the unloading valve core are both arranged on the valve core string.

[0027] According to the unloading valve for an emulsion pump with an anti-cavitation structure provided by the utility model, a first chamber, a second chamber, a third chamber and a fourth chamber are formed in the valve body, one end of the first chamber is connected to the third liquid hole and the second liquid hole, the other end of the first chamber is connected to the unloading pipeline, one end of the second chamber is connected to the first liquid hole, the other end of the second chamber is connected to the liquid outlet of the pump, one end of the third chamber is connected to the fourth liquid hole, the other end of the third chamber is connected to the high-pressure pipeline, one end of the fourth chamber is connected to the second chamber, and the other end of the fourth chamber is connected to the liquid inlet of the mechanical pressure regulating valve.

[0028] The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure, comprising: a valve sleeve and an unloading valve core; the valve sleeve is formed with a first liquid passage hole, a second liquid passage hole and a third liquid passage hole, the third liquid passage hole is connected to the second liquid passage hole, and a sealing member is provided between the second liquid passage hole and the third liquid passage hole; the unloading valve core is movably arranged in the valve sleeve, and a guide groove is formed at the first end of the unloading valve core; a drainage hole is formed inside the unloading valve core, the drainage hole connects the first end of the unloading valve core and the second end of the unloading valve core, one end of the drainage hole is connected to the first liquid passage hole, and the sealing member can seal the other end of the drainage hole; when the unloading valve core is in an unloading state, the first liquid passage hole is connected to the second liquid passage hole, the guide groove guides the emulsion at the position of the second liquid passage hole, and the other end of the drainage hole moves to be connected to the third liquid passage hole. The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure. On the one hand, it unloads through the second liquid passage hole, and also unloads through the drainage hole and the third liquid passage hole. The dual-channel unloading reduces cavitation damage. On the other hand, through the effect of the guide groove, the flow field distribution is optimized to avoid the cavitation site from gathering at the valve sleeve or the outer surface of the valve core, which also reduces the impact of cavitation damage. The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure. Through the above structure, the cavitation damage can be effectively reduced, the reliability can be increased, and the service life can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 The utility model is a schematic structural diagram of an unloading valve for an emulsion pump with an anti-cavitation structure.

[0031] Figure 2 It is a structural schematic diagram of the valve core string provided by the utility model.

[0032] Figure 3 It is a structural schematic diagram of the valve sleeve provided by the utility model.

[0033] Figure 4 It is a structural schematic diagram of the unloading valve core provided by the utility model.

[0034] Reference numerals:

[0035] 10. Mechanical pressure regulating valve; 11. Solenoid pilot valve; 12. Valve core string; 13. Valve body; 130. First chamber; 131. Second chamber; 132. Third chamber; 133. Fourth chamber; 20. Valve sleeve; 21. Unloading spring; 22. Unloading valve core; 23. One-way valve core; 24. One-way valve spring; 25. Third sealing ring; 26. First sealing ring; 27. Second sealing ring; 30. Third sealing groove; 31. Second sealing groove; 32. First sealing groove; 33. Third liquid hole; 34. Second liquid hole; 35. First liquid hole; 36. Fourth liquid hole; 40. Guide groove; 41. Drainage hole. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are 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 creative work are within the scope of protection of the utility model.

[0037] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0039] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the 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, the first feature being "above", "above" and "above" the 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. The first feature being "below", "below" and "below" the 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.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0041] Combine the following Figure 1-Figure 4 The utility model is described as an unloading valve for an emulsion pump with an anti-cavitation structure. The unloading valve for an emulsion pump with an anti-cavitation structure comprises: a valve sleeve 20 and an unloading valve core 22 .

[0042] The valve sleeve 20 is formed with a first liquid passage hole 35, a second liquid passage hole 34 and a third liquid passage hole 33, the third liquid passage hole 33 is connected to the second liquid passage hole 34, and a sealing member is provided between the second liquid passage hole 34 and the third liquid passage hole 33; the unloading valve core 22 is movably provided in the valve sleeve 20, and a guide groove 40 is formed at the first end of the unloading valve core 22; a drainage hole 41 is formed inside the unloading valve core 22, and the drainage hole 41 connects the first end of the unloading valve core 22 and the second end of the unloading valve core 22 (that is, the drainage hole 41 connects the upper and lower ends of the unloading valve core 22), one end of the drainage hole 41 is connected to the first liquid passage hole 35, and the sealing member can seal the other end of the drainage hole 41.

[0043] When the unloading valve core 22 is in the unloading state, the first liquid hole 35 is connected to the second liquid hole 34 , the guide groove 40 guides the emulsion at the position of the second liquid hole 34 , and the other end of the drainage hole 41 moves to be connected to the third liquid hole 33 .

[0044] Specifically, the first liquid hole 35 is used to receive the liquid output from the pump, and the second liquid hole 34 and the third liquid hole 33 are used to discharge the emulsion for unloading. Since the second liquid hole 34 and the third liquid hole 33 are connected, unloading can be performed through the same unloading pipeline.

[0045] Preferably, the guide groove 40 is an annular groove, which is opened at one end close to the first liquid hole 35; the drainage hole 41 is a T-shaped hole, which passes through the unloading valve core 22, and the vertical end of the T-shaped hole is connected to the first liquid hole 35. Through the movement of the unloading valve core 22, the horizontal end of the T-shaped hole can be moved to be connected to the third liquid hole 33.

[0046] In the non-unloading state, the bottom end surface of the unloading valve core 22 blocks the first liquid hole 35 and the second liquid hole 34, and the guide groove 40 cannot connect the first liquid hole 35 and the second liquid hole 34; due to the sealing function of the sealing element, the emulsion entering from one end of the drainage hole 41 cannot be discharged from the other end of the drainage hole 41. Therefore, in this state, the unloading valve does not unload.

[0047] When in the unloading state, the unloading valve core 22 moves upward, so that the first liquid hole 35 is connected to the second liquid hole 34, and unloading can be performed through the second liquid hole 34. Moreover, due to the structure of the guide groove 40, when the emulsion passes through, the emulsion is guided, the flow field distribution can be optimized, and the flow field at the rear of the unloading valve core 22 is optimized, and a vortex is formed at the position of the guide groove 40, so that the cavitation part does not gather at the valve sleeve 20 or the outer surface of the valve core, thereby reducing the impact of cavitation damage; the unloading valve core 22 moves upward, so that the other end of the drainage hole 41 moves to be connected with the third liquid hole 33, and the first liquid hole 35 and the third liquid hole 33 are connected through the drainage hole 41, and unloading can be performed through the third liquid hole 33, and the high-pressure liquid at the front end of the unloading valve core 22 is drained to the rear end of the unloading valve core 22, thereby reducing the pressure difference between its two ends, reducing or even inhibiting the precipitation of bubbles, and further reducing cavitation damage. It can be seen that the above-mentioned guide groove 40 and drainage hole 41 form an anti-cavitation structure. In the above-mentioned unloading state, on the one hand, unloading is carried out through the second liquid hole 34, and also through the drainage hole 41 and the third liquid hole 33, dual-channel unloading reduces cavitation damage; on the other hand, through the effect of the guide groove 40, the flow field distribution is optimized, avoiding the cavitation site from gathering at the valve sleeve 20 or the outer surface of the valve core, and also reducing the impact of cavitation damage.

[0048] The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure, comprising: a valve sleeve 20 and an unloading valve core 22; the valve sleeve 20 is formed with a first liquid hole 35, a second liquid hole 34 and a third liquid hole 33, the third liquid hole 33 is connected to the second liquid hole 34, and a sealing member is provided between the second liquid hole 34 and the third liquid hole 33; the unloading valve core 22 is movably arranged in the valve sleeve 20, and a guide groove 40 is formed at the first end of the unloading valve core 22; the unloading valve core 22 is provided with a first liquid hole 35, a second liquid hole 34 and a third liquid hole 33, and the third liquid hole 33 is connected to the second liquid hole 34, and a sealing member is provided between the second liquid hole 34 and the third liquid hole 33; the unloading valve core 22 is movably arranged in the valve sleeve 20, and a guide groove 40 is formed at the first end of the unloading valve core 22; the unloading valve core 2 A drainage hole 41 is formed inside the unloading valve core 22, and the drainage hole 41 is connected to the first end of the unloading valve core 22 and the second end of the unloading valve core 22. One end of the drainage hole 41 is connected to the first liquid hole 35, and the sealing member can seal the other end of the drainage hole 41. When the unloading valve core 22 is in the unloading state, the first liquid hole 35 is connected to the second liquid hole 34, and the guide groove 40 guides the emulsion at the position of the second liquid hole 34, and the other end of the drainage hole 41 moves to be connected to the third liquid hole 33. The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure. On the one hand, it unloads through the second liquid hole 34, and also unloads through the drainage hole 41 and the third liquid hole 33. The dual-channel unloading reduces cavitation damage. On the other hand, through the effect of the guide groove 40, the flow field distribution is optimized to avoid the cavitation site from gathering at the valve sleeve 20 or the outer surface of the valve core, which also reduces the impact of cavitation damage. The utility model provides an unloading valve for an emulsion pump with an anti-cavitation structure. Through the above structure, the cavitation damage can be effectively reduced, the reliability can be increased, and the service life can be extended.

[0049] In one embodiment of the present utility model, the sealing member includes: a first sealing groove 32, a first sealing ring 26 and a second sealing ring 27. The first sealing groove 32 is provided in the valve sleeve 20; the first sealing ring 26 is provided at one end of the first sealing groove 32, and the second sealing ring 27 is provided at the other end of the first sealing groove 32. The first sealing ring 26 and the second sealing ring 27 seal the first sealing groove 32 to form a sealing cavity; when the unloading valve core 22 is in a non-unloading state, the other end of the drainage hole 41 is sealed by the sealing cavity. In this embodiment, the seal consists of three parts: a first sealing groove 32, a first sealing ring 26 and a second sealing ring 27. The first sealing ring 26 and the second sealing ring 27 are arranged at the upper and lower ends of the first sealing groove 32 to form a sealed cavity. When the unloading valve core 22 is in a non-unloading state, the outlet of the drainage hole 41 is sealed by the sealing cavity and cannot be discharged to unload. If the above-mentioned T-hole structure is adopted, its horizontal end is sealed between the first sealing ring 26 and the second sealing ring 27.

[0050] In one embodiment of the utility model, the unloading valve for the emulsion pump with the anti-cavitation structure further includes: a second sealing groove 31, which is arranged in the valve sleeve 20 and placed in the second liquid passage hole 34. Specifically, the second sealing groove 31 is located at the bottom of the second liquid passage hole 34, and the second sealing groove 31 is used to prevent liquid from leaking from other positions, has sealing performance, and ensures that the emulsion is discharged from the second liquid passage hole 34.

[0051] In one embodiment of the utility model, the unloading valve for the emulsion pump with the anti-cavitation structure further includes: an unloading spring 21, one end of which is fixedly connected to one end of the valve sleeve 20, and the other end of the unloading spring 21 is connected to the unloading valve core 22. In this embodiment, the unloading spring 21 provides a restoring force for the unloading valve core 22. When the load exceeds the elastic force of the unloading spring 21, the unloading valve core 22 overcomes the spring force and moves upward. When the unloading is completed, the unloading valve core 22 is reset under the action of the restoring force of the unloading spring 21.

[0052] In one embodiment of the utility model, the unloading valve for the emulsion pump with the anti-cavitation structure further includes: a connector, which is connected between the other end of the unloading spring 21 and the unloading valve core 22; a third sealing groove 30, which is arranged in the valve sleeve 20 and is arranged near the end of the connector. In this embodiment, the load spring and the unloading valve core 22 are connected by the connector. Preferably, the connector adopts a cylindrical structure, with a groove on the upper part for connecting the load spring, and the bottom is connected to the unloading valve core 22; the third sealing groove 30 is arranged to seal the connector, which is specifically arranged near the upper end of the connector.

[0053] In one of the embodiments of the utility model, the unloading valve for the emulsion pump with the anti-cavitation structure also includes: a third sealing ring 25, and the third sealing ring 25 is arranged in the third sealing groove 30. By arranging the third sealing ring 25 in the third sealing groove 30, the sealing of the connecting part is further improved to avoid leakage of the emulsion.

[0054] In one embodiment of the present invention, the sealing ring can be an O-ring, a rubber sealing pad, a combined sealing pad or other forms of sealing components.

[0055] In one embodiment of the present invention, the guide groove 40 is an annular groove, which is opened at one end close to the first liquid passage hole 35. Specifically, the annular groove is opened at a position close to the bottom end surface of the unloading valve core 22, and the upper part of the annular groove is an arc structure, which has a drainage function.

[0056] In one embodiment of the present invention, the drainage hole 41 is a T-shaped hole, the T-shaped hole passes through the unloading valve core 22, the vertical end of the T-shaped hole is connected to the first liquid hole 35, and the horizontal end of the T-shaped hole can be moved to communicate with the third liquid hole 33 by moving the unloading valve core 22. It can be understood that the bottom of the T-shaped hole is the inlet, and the horizontal end of the top is the outlet.

[0057] In one embodiment of the utility model, the valve sleeve 20 is further formed with a fourth liquid hole 36, and the unloading valve for the emulsion pump with an anti-cavitation structure further includes: a one-way valve core 23, which is movably arranged in the valve sleeve 20 and is arranged near the fourth liquid hole 36. In this embodiment, the one-way valve core 23 is arranged at the bottom of the valve sleeve 20, and the load can be unloaded through the fourth liquid hole 36 by moving the one-way valve core 23.

[0058] In one embodiment of the utility model, the unloading valve for the emulsion pump with an anti-cavitation structure further includes: a one-way valve spring 24, one end of which is fixedly connected to the other end of the valve sleeve 20, and the other end of the one-way valve spring 24 is connected to the one-way valve core 23. In this embodiment, the one-way valve spring 24 provides a restoring force for the one-way valve core 23, and its working principle is the same as that of the unloading spring 21 in the above embodiment, except that the working object is different, which will not be repeated here.

[0059] In one of the embodiments of the utility model, the unloading valve for the emulsion pump with an anti-cavitation structure also includes: a valve body 13 and a mechanical pressure regulating valve 10, an electromagnetic pilot valve 11 and a valve core string 12 assembled on the valve body 13, and the valve sleeve 20 and the unloading valve core 22 are both arranged on the valve core string 12.

[0060] In one embodiment of the present utility model, a first chamber 130, a second chamber 131, a third chamber 132 and a fourth chamber 133 are formed in the valve body 13, one end of the first chamber 130 is connected to the third liquid hole 33 and the second liquid hole 34, the other end of the first chamber 130 is connected to the unloading pipeline, one end of the second chamber 131 is connected to the first liquid hole 35, the other end of the second chamber 131 is connected to the liquid outlet of the pump, one end of the third chamber 132 is connected to the fourth liquid hole 36, the other end of the third chamber 132 is connected to the high-pressure pipeline, one end of the fourth chamber 133 is connected to the second chamber 131, and the other end of the fourth chamber 133 is connected to the liquid inlet of the mechanical pressure regulating valve 10. Specifically, the liquid inlet of the mechanical pressure regulating valve 10 is connected to the fourth chamber 133; the liquid return port of the mechanical pressure regulating valve 10 is connected to the unloading pipeline; the liquid inlet of the electromagnetic pilot valve 11 is connected to the first chamber 130, and the liquid return port of the electromagnetic pilot valve 11 is connected to the unloading pipeline. Each chamber in this embodiment is used to connect the corresponding structure to transport the emulsion. Among them, due to the existence of the first chamber 130, the emulsion discharged from the third liquid hole 33 and the second liquid hole 34 is merged and discharged through the unloading pipeline.

[0061] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed over multiple units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those of ordinary skill in the art may understand and implement the present invention without creative effort.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An unloading valve for an emulsion pump with an anti-cavitation structure, characterized in that: include: a valve sleeve (20), the valve sleeve (20) being formed with a first liquid passage hole (35), a second liquid passage hole (34) and a third liquid passage hole (33), the third liquid passage hole (33) being in communication with the second liquid passage hole (34), and a sealing member being provided between the second liquid passage hole (34) and the third liquid passage hole (33); a relief valve core (22), the relief valve core (22) being movably disposed in the valve sleeve (20), the first end of the relief valve core (22) being formed with a guide groove (40); a drainage hole (41) being formed inside the relief valve core (22), the drainage hole (41) being in communication with the first end of the relief valve core (22) and the second end of the relief valve core (22), one end of the drainage hole (41) being in communication with the first liquid passage hole (35), and the sealing member being capable of sealing the other end of the drainage hole (41); When the unloading valve core (22) is in an unloading state, the first liquid passage hole (35) is connected to the second liquid passage hole (34), the guide groove (40) guides the emulsion at the position of the second liquid passage hole (34), and the other end of the drainage hole (41) moves to be connected to the third liquid passage hole (33).

2. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 1, characterized in that: The sealing member comprises: a first sealing groove (32), wherein the first sealing groove (32) is provided in the valve sleeve (20); A first sealing ring (26) and a second sealing ring (27), wherein the first sealing ring (26) and the second sealing ring (27) seal the first sealing groove (32) to form a sealed cavity; When the unloading valve core (22) is in a non-unloading state, the other end of the drainage hole (41) is sealed by the sealing cavity.

3. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 1, characterized in that: Also includes: A second sealing groove (31), wherein the second sealing groove (31) is provided in the valve sleeve (20) and is disposed in the second liquid passage hole (34).

4. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 1, characterized in that: Also includes: A unloading spring (21), one end of the unloading spring (21) being fixedly connected to one end of the valve sleeve (20), and the other end of the unloading spring (21) being connected to the unloading valve core (22).

5. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 4, characterized in that: Also includes: A connecting piece, the connecting piece being connected between the other end of the unloading spring (21) and the unloading valve core (22); A third sealing groove (30), the third sealing groove (30) being arranged in the valve sleeve (20) and close to an end of the connecting piece.

6. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 5, characterized in that: Also includes: A third sealing ring (25), wherein the third sealing ring (25) is arranged in the third sealing groove (30).

7. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 1, characterized in that: The guide groove (40) is an annular groove, and the annular groove is opened at one end close to the first liquid passage hole (35).

8. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 1, characterized in that: The drainage hole (41) is a T-shaped hole, the T-shaped hole passes through the unloading valve core (22), the vertical end of the T-shaped hole is connected to the first liquid passage hole (35), and the horizontal end of the T-shaped hole can be moved to be connected to the third liquid passage hole (33) through the movement of the unloading valve core (22).

9. The unloading valve for an emulsion pump with an anti-cavitation structure according to any one of claims 1 to 8, characterized in that: The valve sleeve (20) is further formed with a fourth liquid passage hole (36); the unloading valve for an emulsion pump with an anti-cavitation structure further comprises: a one-way valve core (23), the one-way valve core (23) being movably disposed in the valve sleeve (20) and arranged close to the fourth liquid passage hole (36).

10. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 9, characterized in that: Also includes: A one-way valve spring (24), one end of the one-way valve spring (24) being fixedly connected to the other end of the valve sleeve (20), and the other end of the one-way valve spring (24) being connected to the one-way valve core (23).

11. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 9, characterized in that: Also includes: A valve body (13), a mechanical pressure regulating valve (10), an electromagnetic pilot valve (11) and a valve core string (12) mounted on the valve body (13); the valve sleeve (20) and the unloading valve core (22) are both arranged on the valve core string (12).

12. The unloading valve for an emulsion pump with an anti-cavitation structure according to claim 11, characterized in that: A first chamber (130), a second chamber (131), a third chamber (132) and a fourth chamber (133) are formed in the valve body (13); one end of the first chamber (130) is in communication with the third liquid passage hole (33) and the second liquid passage hole (34); the other end of the first chamber (130) is in communication with a load-relief pipeline; one end of the second chamber (131) is in communication with the first liquid passage hole (35); the other end of the second chamber (131) is in communication with a liquid outlet of a pump; one end of the third chamber (132) is in communication with the fourth liquid passage hole (36); the other end of the third chamber (132) is in communication with a high-pressure pipeline; one end of the fourth chamber (133) is in communication with the second chamber (131); and the other end of the fourth chamber (133) is in communication with a liquid inlet of the mechanical pressure regulating valve (10).

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