Lubricating pump and electromagnetic unloading valve thereof

Abstract

The utility model relates to a lubricating pump and an electromagnetic unloading valve thereof. Comprising an electromagnet assembly which comprises a movable iron core. The valve body comprises a grease inlet communicated with an outlet of a lubricating pump, a grease outlet communicated with a lubricating pipeline and a grease return opening communicated with an oil tank, and further comprises a valve element cavity, and the electromagnet assembly is installed at the position of the valve element cavity so that the movable iron core can stretch into and stretch out of the valve element cavity in the axial direction of the valve element cavity. The grease inlet is communicated with the center of the bottom of the valve element cavity through a first channel arranged in the valve body, the valve element cavity is communicated with the grease return opening through a second channel arranged in the valve body, and the grease inlet is communicated with the grease outlet through a third channel arranged in the valve body. The end, located in the valve element cavity, of the first channel is a round hole or a taper hole. The valve element is located in the valve element cavity and provided with a spherical surface matched with the round hole or a conical surface matched with the conical hole. The device has the advantages of simple structure, low cost and difficulty in damage.

Description

Technical Field

[0001] This utility model relates to a lubrication pump and its electromagnetic unloading valve. Background Technology

[0002] When using a centralized lubrication system, the lubrication pump needs to stop after pumping grease once to unload the pressure of the grease in the pipeline so that the distributor can reset. When unloading the lubrication pump, a three-way solenoid valve is generally installed between the outlet of the lubrication pump and the oil tank of the lubrication pump. The valve is closed when the lubrication pump is working and opened when the lubrication pump stops so that the grease in the pipeline connected to the outlet of the lubrication pump can flow back to the oil tank to achieve the purpose of unloading.

[0003] The existing solenoid valves used for the above purposes have a relatively complex structure, high cost, and are prone to damage. This is because they use spring reset or the cylindrical valve core is subjected to radial force. After long-term use, the spring has insufficient restoring force, which leads to difficulty in valve position switching. The cylindrical valve core wears more rapidly after being subjected to radial force. Utility Model Content

[0004] The purpose of this utility model is to provide an electromagnetic unloading valve that is simple in structure, low in cost and not easily damaged. The purpose of this utility model is also to provide a lubrication pump that uses the above-mentioned electromagnetic unloading valve.

[0005] The technical solution of the electromagnetic unloading valve of this utility model is as follows: The electromagnetic unloading valve includes an electromagnet assembly, the electromagnet assembly includes a movable iron core, and further includes:

[0006] The valve body includes a grease inlet for connecting to the outlet of the lubrication pump, a grease outlet for connecting to the lubrication pipeline, and a grease return outlet for connecting to the oil tank. It also includes a valve core cavity. An electromagnet assembly is installed in the valve core cavity so that the movable iron core can extend into and out of the valve core cavity along the axial direction of the valve core cavity. The grease inlet is connected to the bottom center of the valve core cavity through a first channel provided in the valve body. The valve core cavity is connected to the grease return outlet through a second channel provided in the valve body. The grease inlet is connected to the grease outlet through a third channel provided in the valve body. The first channel is a round hole or a conical hole at one end located in the valve core cavity.

[0007] The valve core, located inside the valve core cavity, has a spherical surface for engaging with the circular hole or a conical surface for engaging with the conical hole;

[0008] When in operation, the electromagnet assembly is energized, causing the movable iron core to press against the valve core to seal one end of the first channel; when unloading, the electromagnet assembly is de-energized, and the pressure of the grease in the first channel pushes open the valve core and connects with the second channel for oil return and unloading.

[0009] The beneficial effects of this solution are as follows: The electromagnetic unloading valve of this application only requires a valve body, valve core, and solenoid valve assembly to meet the required functions. It has few structural components and low cost. Moreover, the special structural design of its valve core cavity and the special matching structure between the valve core and the opening of the first channel prevent the valve core from being affected by the pressure of the lubricating grease, which would lead to accelerated wear. Furthermore, since the valve core and the round hole or conical hole are sealed by a circular line seal or a conical surface seal, the sealing performance is good. In addition, the valve adopts the method of sealing when energized and opening when de-energized. When the power is off, the valve core can be opened by the pressure of the lubricating grease itself, eliminating the need for a spring. This not only reduces costs but also avoids valve failure due to spring failure. It is evident that the valve of this application is not only simple in structure and low in cost but also relatively stable, reliable, and not easily damaged.

[0010] Furthermore, the valve body is also provided with an overflow port for communicating with the oil outlet of the safety valve of the lubrication pump. The overflow port is connected to the second channel, and when the safety valve is opened, the overflow can be returned to the oil tank through the second channel.

[0011] The beneficial effects of this solution are as follows: The valve body of this application is integrated into two functions, not only serving as an unloading valve, but also merging the overflow circuit of the safety valve with the return flow channel of the electromagnetic unloading valve. Since the safety valve is unidirectional, there is no need to worry about the grease of the electromagnetic unloading valve flowing back into the safety valve. The ingenious combination of the two not only reduces the number of parts and lowers the cost, but also reduces the size.

[0012] Furthermore, the valve core is a steel ball. Steel balls, as valve cores, have the advantages of low cost, easy availability, and the ability to be used on surfaces that are not concentrated, thus reducing wear.

[0013] Furthermore, the end of the valve core facing the first channel has a frustum-shaped structure.

[0014] Furthermore, oil pipe joints are provided at the grease inlet, grease outlet, and grease return outlet.

[0015] Furthermore, an oil pipe connector is provided at the overflow port.

[0016] The technical solution of the lubrication pump of this utility model is as follows: The lubrication pump includes a pump body, an oil tank, and an electromagnetic unloading valve. The pump body has an outlet for pumping out lubricating grease. The electromagnetic unloading valve includes an electromagnet assembly, which includes a movable iron core, and further includes:

[0017] The valve body includes a grease inlet communicating with the outlet, a grease outlet communicating with the lubrication pipeline, and a grease return port communicating with the oil tank. It also includes a valve core cavity. An electromagnet assembly is installed in the valve core cavity so that the movable iron core can extend into and out of the valve core cavity along the axial direction of the valve core cavity. The grease inlet communicates with the bottom center of the valve core cavity through a first channel provided in the valve body. The valve core cavity communicates with the grease return port through a second channel provided in the valve body. The grease inlet communicates with the grease outlet through a third channel provided in the valve body. The first channel is a round hole or a conical hole at one end located in the valve core cavity.

[0018] The valve core, located inside the valve core cavity, has a spherical surface for engaging with the circular hole or a conical surface for engaging with the conical hole;

[0019] When in operation, the electromagnet assembly is energized, causing the movable iron core to squeeze the valve core to seal one end of the first channel, and the grease enters from the grease inlet and flows out from the grease outlet; when unloading, the electromagnet assembly is de-energized, and the pressure of the grease in the first channel pushes open the valve core and connects with the second channel to return oil to the oil tank for unloading.

[0020] The beneficial effects of this solution are as follows: The electromagnetic unloading valve of this application only requires a valve body, valve core, and solenoid valve assembly to meet the required functions. It has few structural components and low cost. Moreover, the special structural design of its valve core cavity and the special matching structure between the valve core and the opening of the first channel prevent the valve core from being affected by the pressure of the lubricating grease, which would lead to accelerated wear. Furthermore, since the valve core and the round hole or conical hole are sealed by a circular line seal or a conical surface seal, the sealing performance is good. In addition, the valve adopts the method of sealing when energized and opening when de-energized. When the power is off, the valve core can be opened by the pressure of the lubricating grease itself, eliminating the need for a spring. This not only reduces costs but also avoids valve failure due to spring failure. It is evident that the valve of this application is not only simple in structure and low in cost but also relatively stable, reliable, and not easily damaged.

[0021] Furthermore, the valve body is also provided with an overflow port for communicating with the oil outlet of the safety valve of the lubrication pump. The overflow port is connected to the second channel, and when the safety valve is opened, the overflow can be returned to the oil tank through the second channel.

[0022] The beneficial effects of this solution are as follows: The valve body of this application is integrated into two functions, not only serving as an unloading valve, but also merging the overflow circuit of the safety valve with the return flow channel of the electromagnetic unloading valve. Since the safety valve is unidirectional, there is no need to worry about the grease of the electromagnetic unloading valve flowing back into the safety valve. The ingenious combination of the two not only reduces the number of parts and lowers the cost, but also reduces the size.

[0023] Furthermore, the valve core is a steel ball. Steel balls, as valve cores, have the advantages of low cost, easy availability, and the ability to be used on surfaces that are not concentrated, thus reducing wear.

[0024] Furthermore, the end of the valve core facing the first channel has a frustum-shaped structure.

[0025] Furthermore, oil pipe joints are provided at the grease inlet, grease outlet, and grease return outlet.

[0026] Furthermore, an oil pipe connector is provided at the overflow port. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the lower half of an embodiment of the lubrication pump of this utility model;

[0028] Figure 2 A three-dimensional structural diagram showing the connection state of the electromagnetic unloading valve and the safety valve;

[0029] Figure 3 A front view of the electromagnetic unloading valve after the connector and plug are installed;

[0030] Figure 4 for Figure 3 Sectional view at point AA;

[0031] Figure 5 for Figure 3 The left view;

[0032] Figure 6 for Figure 5 Sectional view at point BB;

[0033] Figure 7 This is a cross-sectional view of the electromagnetic unloading valve in the second embodiment of the lubrication pump;

[0034] In the diagram: 1-Pump body, 2-Oil tank, 3-Safety valve, 4-Solenoid unloading valve, 41-Solenoid assembly, 411-Moving iron core, 42-Valve body, 421-Grease inlet, 422-Grease outlet, 423-Grease return port, 424-Valve core cavity, 425-First channel, 4251-Round hole, 4252-Conical hole, 426-Second channel, 428-Overflow port, 43-Valve core, 5-Oil pipe, 6-Oil pipe connector. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0039] One embodiment of the lubrication pump of this utility model: In this embodiment, the lubrication pump is used in a single-line system. The lubrication pump is connected to a single-line distributor via a pipeline, and the single-line distributor is connected to the equipment to be lubricated via a branch pipe. The lubrication pump includes a pump body 1 and an oil tank 2 mounted on the upper part of the pump body 1. The oil tank 2 contains lubricating grease. The pump body 1 contains a motor, a transmission mechanism, and a plunger assembly, etc., which can pump the lubricating grease from the oil tank 2. A safety valve 3 and an electromagnetic unloading valve are connected to the outlet of the pump body 1. The safety valve 3 is a one-way valve that provides safety protection for the system; it opens when the system oil pressure reaches its set value. Figure 1 As shown, the outlet of the lubrication pump is connected to safety valve 3. Safety valve 3 has a three-way structure. When safety valve 3 is not open, the grease flows through the pipeline to the electromagnetic unloading valve. When safety valve 3 is open, the grease flows through another channel, through the grease return port 423 of the electromagnetic unloading valve, and then through the pipeline into the inlet of oil tank 2, so that the overflowing grease flows back into oil tank 2.

[0040] like Figure 2-6 As shown, the electromagnetic unloading valve includes an electromagnet assembly 41, which includes a coil and a movable iron core 411 movably assembled therein. When the coil is energized, the movable iron core 411 moves downward to push the valve core. In this embodiment, the other end of the movable iron core 411 may not be equipped with a spring, but the pressure of the grease pushing the valve core can be used to push the movable iron core 411 back to its original position. Of course, a reset spring can also be provided in other embodiments.

[0041] like Figure 1 , 4As shown, the valve body 42 includes a grease inlet 421 for communicating with the outlet of the lubrication pump, a grease outlet 422 for communicating with the lubrication pipeline, and a grease return port 423 for communicating with the oil tank 2. It also includes a valve core cavity 424, which is a cylindrical blind hole. The electromagnet assembly 41 is installed in the valve core cavity 424 so that the movable iron core 411 can extend into and out of the valve core cavity 424 along the axial direction of the valve core cavity 424. The grease inlet 421 is connected to the bottom center of the valve core cavity 424 through a first channel 425 provided in the valve body 42. The valve core cavity 424 is connected to the grease return port 423 through a second channel 426 provided in the valve body 42. The grease inlet 421 is connected to the grease outlet 422 through a third channel provided in the valve body 42. One end of the first channel 425 located in the valve core cavity 424 is a round hole 4251 or a conical hole 4252. The valve body 42 is also provided with an overflow port 428 for communicating with the oil outlet of the safety valve 3 of the lubrication pump. The overflow port 428 is connected to the second channel 426. When the safety valve 3 is opened, the overflow can be returned to the oil tank 2 through the second channel 426. Oil pipe joints 6 are provided at the grease inlet 421, grease outlet 422, grease return port 423 and overflow port 428.

[0042] The valve core is located within the valve core cavity 424 and has a spherical surface for mating with the circular hole 4251 or a conical surface for mating with the conical hole 4252. The valve core is a steel ball. Using a steel ball as a valve core has the advantages of low cost, easy availability, and a non-concentrated mating surface that is less prone to wear.

[0043] During operation, the electromagnet assembly 41 is energized, causing the movable iron core 411 to press against the valve core to seal one end of the first channel 425; during unloading, the electromagnet assembly 41 is de-energized, and the pressure of the grease in the first channel 425 pushes open the valve core and connects with the second channel 426 to perform oil return unloading.

[0044] The electromagnetic unloading valve of this application only requires a valve body 42, a valve core, and a solenoid valve assembly to meet the required functions. It has few structural components and low cost. Moreover, the special structural design of its valve core cavity 424 and the special matching structure between the valve core and the opening of the first channel 425 prevent the valve core from being affected by the pressure of the lubricating grease, which would lead to accelerated wear. Furthermore, since the valve core and the circular hole 4251 or the conical hole 4252 are sealed by a circular line seal or a conical surface seal, the sealing performance is good. In addition, it adopts the method of sealing when energized and opening when de-energized. When the power is off, the valve core can be opened by the pressure of the lubricating grease itself, eliminating the need for a spring. This not only reduces cost but also avoids valve failure due to spring failure. It can be seen that the valve of this application is not only simple in structure and low in cost but also relatively stable, reliable, and not easily damaged. The valve body 42 of this application is a dual-purpose unit, serving not only as an unloading valve but also as a combined channel for the overflow circuit of the safety valve 3 and the return flow of the electromagnetic unloading valve. Since the safety valve 3 is unidirectional, there is no need to worry about the grease of the electromagnetic unloading valve flowing back into the safety valve 3. The ingenious combination of the two not only reduces the number of parts and lowers the cost but also reduces the size.

[0045] In other embodiments, such as Figure 7 As shown, the end of the valve core facing the first channel 425 has a frustum-shaped structure.

[0046] The structure of the electromagnetic unloading valve of this utility model is the same as that of the electromagnetic unloading valve in the above-mentioned embodiments of the lubrication pump, and will not be described again.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An electromagnetic unloading valve, comprising an electromagnet assembly, the electromagnet assembly including a movable iron core, characterized in that, Also includes: The valve body includes a grease inlet for connecting to the outlet of the lubrication pump, a grease outlet for connecting to the lubrication pipeline, and a grease return outlet for connecting to the oil tank. It also includes a valve core cavity. An electromagnet assembly is installed in the valve core cavity so that the movable iron core can extend into and out of the valve core cavity along the axial direction of the valve core cavity. The grease inlet is connected to the bottom center of the valve core cavity through a first channel provided in the valve body. The valve core cavity is connected to the grease return outlet through a second channel provided in the valve body. The grease inlet is connected to the grease outlet through a third channel provided in the valve body. The first channel is a round hole or a conical hole at one end located in the valve core cavity. The valve core, located inside the valve core cavity, has a spherical surface for engaging with the circular hole or a conical surface for engaging with the conical hole; When in operation, the electromagnet assembly is energized, causing the movable iron core to press against the valve core to seal one end of the first channel; when unloading, the electromagnet assembly is de-energized, and the pressure of the grease in the first channel pushes open the valve core and connects with the second channel for oil return and unloading.

2. The electromagnetic unloading valve according to claim 1, characterized in that, The valve body is also provided with an overflow port for connecting to the oil outlet of the safety valve of the lubrication pump. The overflow port is connected to the second channel, and when the safety valve is opened, the overflow can be returned to the oil tank through the second channel.

3. The electromagnetic unloading valve according to claim 1, characterized in that, The valve core is a steel ball.

4. The electromagnetic unloading valve according to claim 1, characterized in that, The end of the valve core facing the first channel has a frustum-shaped structure.

5. The electromagnetic unloading valve according to claim 1, characterized in that, Oil pipe connectors are provided at the grease inlet, grease outlet, and grease return outlet.

6. The electromagnetic unloading valve according to claim 1, characterized in that, An oil pipe connector is provided at the overflow port.

7. A lubrication pump, comprising a pump body, an oil tank, and an electromagnetic unloading valve, wherein the pump body has an outlet for pumping out lubricating grease; the electromagnetic unloading valve comprises an electromagnet assembly, the electromagnet assembly comprising a movable iron core, characterized in that, Also includes: The valve body includes a grease inlet communicating with the outlet, a grease outlet communicating with the lubrication pipeline, and a grease return port communicating with the oil tank. It also includes a valve core cavity. An electromagnet assembly is installed in the valve core cavity so that the movable iron core can extend into and out of the valve core cavity along the axial direction of the valve core cavity. The grease inlet communicates with the bottom center of the valve core cavity through a first channel provided in the valve body. The valve core cavity communicates with the grease return port through a second channel provided in the valve body. The grease inlet communicates with the grease outlet through a third channel provided in the valve body. The first channel is a round hole or a conical hole at one end located in the valve core cavity. The valve core, located inside the valve core cavity, has a spherical surface for engaging with the circular hole or a conical surface for engaging with the conical hole; When in operation, the electromagnet assembly is energized, causing the movable iron core to squeeze the valve core to seal one end of the first channel, and the grease enters from the grease inlet and flows out from the grease outlet; when unloading, the electromagnet assembly is de-energized, and the pressure of the grease in the first channel pushes open the valve core and connects with the second channel to return oil to the oil tank for unloading.

8. The lubrication pump according to claim 7, characterized in that, The outlet of the lubrication pump is connected to a safety valve. The valve body is provided with an overflow port that is connected to the oil outlet of the safety valve. The overflow port is connected to the second channel. When the safety valve is opened, the oil can overflow back to the oil tank through the second channel.

9. The lubrication pump according to claim 7, characterized in that, The valve core is a steel ball.

10. The lubrication pump according to claim 7, characterized in that, The end of the valve core facing the first channel has a frustum-shaped structure.

11. The lubrication pump according to claim 7, characterized in that, Oil pipe connectors are provided at the grease inlet, grease outlet, and grease return outlet.

12. The lubrication pump according to claim 7, characterized in that, An oil pipe connector is provided at the overflow port.

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