Plunger structure of plunger type hydraulic pump and plunger type hydraulic pump including the same

Abstract

The present invention relates to a plunger structure of a plunger hydraulic pump and a plunger hydraulic pump including the same. The plunger structure of the plunger hydraulic pump includes: a plunger body, a plunger ball head and a one-way throttle valve; the plunger ball head is connected to one end of the plunger body, the plunger body is provided with a hollow cavity, one end of the hollow cavity is provided with an opening structure; at least one first channel is provided on the plunger body, the first channel connects the hollow cavity with the outside of the plunger body; the one-way throttle valve is provided in the hollow cavity, and is used to open and close the first channel. The present invention provides at least one first channel on the plunger body, so that when the plunger structure does not absorb enough oil, the oil can be supplemented through the first channel, thereby solving the problem of insufficient oil absorption of the plunger structure, especially when the operating speed of the hydraulic pump is extremely increased, the oil absorption phenomenon occurs, resulting in the problem of cavitation.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger hydraulic pumps, and in particular to a plunger structure of a plunger hydraulic pump and a plunger hydraulic pump comprising the same. Background Art

[0002] The plunger hydraulic pump is the core equipment in the hydraulic system, which realizes the oil suction and oil pressure process through the reciprocating linear motion of the plunger relative to the cylinder body. Figure 1 As shown, the plunger commonly used in the current plunger hydraulic pump includes a plunger body 10 and a plunger ball head 11. The plunger body 10 is provided with a hollow cavity 100, and the plunger ball head 11 is provided with a throttle hole 110. During the oil suction process, the plunger of this structure can only rely on sucking oil from the bottom of the plunger. When the working conditions change, this structure may cause insufficient oil suction in the plunger cavity. Especially when the operating speed of the hydraulic pump is increased rapidly, it is easy to cause oil suction and cavitation. Therefore, in order to increase the speed, the existing plunger hydraulic pump generally satisfies the oil suction of the plunger cavity by pressurizing the oil suction port. However, this adds extra parts, resulting in an increase in the volume and weight of the hydraulic pump, or an increase in the configuration of system components. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a plunger structure of a plunger hydraulic pump and a plunger hydraulic pump including the same, so as to solve the problem of insufficient oil suction in the plunger chamber in the prior art, especially when the operating speed of the hydraulic pump is extremely increased, oil suction occurs, resulting in cavitation.

[0004] In order to solve or improve the above technical problems to a certain extent, according to one aspect of the present invention, a plunger structure of a plunger type hydraulic pump is provided, comprising: a plunger body, a plunger ball head and a one-way throttle valve;

[0005] The plunger ball head is connected to one end of the plunger body, the plunger body is provided with a hollow cavity, and one end of the hollow cavity is provided with an open structure;

[0006] At least one first channel is provided on the plunger body, and the first channel communicates the hollow cavity with the outside of the plunger body;

[0007] The one-way throttle valve is arranged in the hollow cavity and is used for opening and closing the first channel.

[0008] Furthermore, the one-way throttle valve comprises a valve core, an elastic member and a valve seat;

[0009] The valve seat is fixedly connected to the inner wall of the hollow cavity, and a through guide channel is provided in the middle of the valve seat;

[0010] The valve core comprises a valve core head and a valve core rod, and the valve core rod is inserted into the guide channel;

[0011] The elastic member is sleeved on the valve core rod, and two ends of the elastic member abut against the valve core head and the valve seat respectively.

[0012] Further, the first channel is provided at the one end of the plunger body to connect the other end of the hollow cavity with the outside of the plunger body;

[0013] When the one-way throttle valve is in the first state, the valve core head abuts against the other end of the hollow cavity;

[0014] When the one-way throttle valve is in the second state, the valve core head is away from the other end of the hollow cavity.

[0015] Furthermore, the other end of the hollow cavity is configured as a conical surface structure, and the valve core head is configured as a conical surface structure matching the other end of the hollow cavity.

[0016] Furthermore, the other end of the hollow cavity is configured as a spherical structure, and the valve core head is configured as a spherical structure matching the other end of the hollow cavity.

[0017] Furthermore, two retaining spring grooves are circumferentially arranged on the inner side wall of the hollow cavity, retaining springs are arranged in the retaining spring grooves, and the valve seat is arranged between the two retaining springs.

[0018] Furthermore, a plurality of second channels are arranged on the valve seat.

[0019] Furthermore, a throttle hole is arranged on the plunger ball head, and the throttle hole is connected to the hollow cavity.

[0020] Furthermore, a throttling channel is provided on the valve core, and the throttling channel passes through the valve core head and the valve core rod;

[0021] When the one-way throttle valve is in the first state, the throttle channel is connected to the throttle hole.

[0022] According to another aspect of the present invention, there is provided a plunger type hydraulic pump, comprising the plunger structure of the plunger type hydraulic pump described in any one of the above.

[0023] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the plunger structure of a plunger hydraulic pump and the plunger hydraulic pump having the same can achieve considerable technical advancement and practicality, and have wide industrial utilization value, and have at least the following advantages:

[0024] The present invention provides at least one first channel on the plunger body, so that when the plunger hydraulic pump does not absorb enough oil, oil is sucked through the first channel to achieve two-way oil suction, thereby improving the oil suction capacity of the plunger hydraulic pump, increasing the operating speed of the plunger pump, increasing power, and solving the hazards of cavitation and noise caused by air suction.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram showing a plunger structure of a plunger hydraulic pump in the prior art;

[0027] Figure 2 A schematic diagram of the exploded structure of a plunger structure of a plunger type hydraulic pump according to an embodiment of the present invention is shown;

[0028] Figure 3 A schematic structural diagram of a plunger structure of a plunger type hydraulic pump according to an embodiment of the present invention is shown.

[0029]

Explanation of symbols

[0030] 1: plunger structure;

[0031] 10: plunger body;

[0032] 100: hollow cavity;

[0033] 1001: Opening structure;

[0034] 1002: circlip groove;

[0035] 1003: circlip;

[0036] 101: first channel;

[0037] 11: plunger ball head;

[0038] 110: throttle hole;

[0039] 12: One-way throttle valve;

[0040] 120: valve core;

[0041] 1201: valve core head;

[0042] 1202: valve core rod;

[0043] 1203: throttling hole;

[0044] 121: elastic member;

[0045] 122: valve seat;

[0046] 1221: guide channel;

[0047] 1222: The second channel. DETAILED DESCRIPTION

[0048] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of the plunger structure of a plunger hydraulic pump proposed by the present invention and the specific implementation method and effects of the plunger hydraulic pump having the same, in combination with the accompanying drawings and preferred embodiments.

[0049] The embodiment of the present invention provides a plunger structure of a plunger hydraulic pump. Figure 2 As shown, it includes: a plunger body 10, a plunger ball head 11 and a one-way throttle valve 12.

[0050] Among them, the plunger ball head 11 is connected to one end of the plunger body 10, the plunger body 10 is provided with a hollow cavity 100, and one end of the hollow cavity 100 is set as an opening structure 1001; at least one first channel 101 is set on the plunger body 10, and the first channel 101 connects the hollow cavity 100 with the outside of the plunger body 10; the one-way throttle valve 12 is set in the hollow cavity 100, which is used to open and close the first channel 101.

[0051] When the plunger hydraulic pump changes its speed, when oil is only sucked through the opening structure 1001 of the hollow cavity 100, insufficient oil suction is very likely to occur, especially when the speed of the plunger hydraulic pump is rapidly increased, oil suction is very likely to occur, resulting in cavitation. Based on this, the present invention also sets at least one first channel 101 on the plunger body 10, and the first channel 101 connects the hollow cavity 100 of the plunger body 10 and the outside of the plunger body 10. When the plunger structure 1 does not absorb enough oil, the one-way throttle valve 12 opens the first channel 101, so that the plunger structure 1 sucks the oil outside the plunger body 10 into the hollow cavity 100 through the first channel 101. Through the setting of the at least one first channel 101, the plunger hydraulic pump realizes two-way oil suction, avoiding insufficient oil suction and cavitation. When the plunger hydraulic pump presses oil, the first channel 101 is closed by the one-way throttle valve 12 , so that the oil in the hollow cavity 100 is pressed out through the opening structure 1001 of the hollow cavity 100 .

[0052] In a specific embodiment, if Figure 2 and Figure 3As shown, the first channel 101 is disposed at one end of the plunger body 10 , and the end of the plunger body 10 where the first channel 101 is disposed is opposite to the opening structure 1001 of the hollow cavity 100 .

[0053] Furthermore, if Figure 2 and Figure 3 As shown, the first channel 101 is configured as an oblique channel and is disposed between the plunger body 10 and the plunger ball head 11 .

[0054] In one embodiment, if Figure 2 and Figure 3 As shown, the one-way throttle valve 12 includes a valve core 120 , an elastic member 121 and a valve seat 122 .

[0055] The valve seat 122 is fixedly connected to the inner wall of the hollow cavity 100. Figure 2 As shown, two retaining ring grooves 1002 are arranged on the inner side wall of the hollow cavity 100 along the circumference of the inner side wall of the hollow cavity 100. Figure 3 As shown, a clamping spring 1003 is disposed in each of the two clamping spring grooves 1002, and the valve seat 122 is disposed between the two clamping springs 1003, so that the valve seat 122 is fixedly connected to the inner wall of the hollow cavity 100 through the clamping spring 1003. A through guide channel 1221 is disposed in the middle of the valve seat 122.

[0056] The valve core 120 is composed of a valve core head 1201 and a valve core rod 1202. The valve core rod 1202 is inserted into a guide channel 1221 of a valve seat 122, so that the valve core rod 1202 moves along the guide channel 1221, thereby guiding the movement of the valve core 120. The elastic member 121 is sleeved on the valve core rod 1202, and the two ends of the elastic member 121 abut against the valve core head 1201 and the valve seat 122, respectively.

[0057] In actual application, the elastic member 121 is a spring with a relatively small stiffness, so as to ensure that the one-way throttle valve 12 can smoothly open the first channel 101 when the plunger structure 1 does not absorb enough oil.

[0058] When the plunger type oil suction pump is in the oil suction state and the oil suction is insufficient, negative pressure will be formed in the hollow cavity 100. Under the action of the negative pressure, the valve core 120 will move toward the opening structure 1001 of the hollow cavity 100. At this time, the one-way throttle valve 12 is in the second state, and the valve core head 1201 is away from one end of the plunger body 10 provided with the first channel 101, that is, the valve core head 1201 is away from the other end of the hollow cavity 100. The first channel 101 is opened, and the oil outside the plunger structure 1 enters the hollow cavity 100 through the first channel 101, causing the negative pressure in the hollow cavity 100 to disappear. Under the action of the elastic member 121, the one-way throttle valve 12 is in the first state, and the valve core head 1201 abuts against one end of the plunger body 10 provided with the first channel 101, that is, the valve core head 1201 abuts against the other end of the hollow cavity 100. At this time, the one-way throttle valve 12 closes the first channel 101.

[0059] In one embodiment, if Figure 2 and Figure 3 As shown, the other end of the hollow cavity 100 (ie, the end opposite to the opening structure 1001 of the hollow cavity 100 ) is configured as a conical structure, and the valve core head 1201 is configured as a conical structure matching the other end of the hollow cavity 100 .

[0060] In another embodiment, the other end of the hollow cavity 100 (i.e., the end opposite to the opening structure 1001 of the hollow cavity 100 ) may also be set as a spherical structure, and the valve core head 1201 is set as a spherical structure matching the other end of the hollow cavity 100 .

[0061] In one embodiment, the valve core head 1201 is not attached to the inner wall of the hollow cavity 100, and a certain gap is left between it and the inner wall of the hollow cavity 100. When the oil enters through the first channel 101, the oil will flow into the space surrounded by the valve core 120, the valve seat 122 and the inner wall of the hollow cavity 100 along the gap. In order to make the oil flowing into the space flow smoothly into the hollow cavity 100, Figure 2 and 3 As shown, a plurality of through-going second channels 1222 are provided on the valve seat 122 .

[0062] In one embodiment, if Figure 2 and Figure 3 As shown, a throttle hole 110 is provided on the plunger ball head 11, and the throttle hole 110 is connected to the hollow cavity 100 and the outside of the plunger structure 1. Part of the oil in the hollow cavity 100 is introduced into the end face of the sliding shoe of the plunger hydraulic pump through the throttle hole 110 to form an oil film between the end face of the sliding shoe and the swash plate, thereby reducing the wear on the end face of the sliding shoe and the swash plate.

[0063] Furthermore, if Figure 2 and Figure 3As shown, a throttling channel 1203 is provided on the valve core 120, and the throttling channel 1203 passes through the valve core head 1201 and the valve core rod 1202. When the one-way throttle valve 12 is in the first state, the throttling channel 1203 is connected to the throttling hole 110 provided on the plunger ball head 11, so as to guide part of the oil in the hollow cavity 100 to the end surface of the sliding shoe of the plunger hydraulic pump.

[0064] An embodiment of the present invention further provides a plunger type hydraulic pump, comprising the plunger structure 1 of the plunger type hydraulic pump of any of the above embodiments.

[0065] The plunger structure of the plunger hydraulic pump of the present invention and the plunger hydraulic pump including the same achieve a two-way oil suction effect by providing at least one first hole on the plunger body. When the oil suction in the hollow cavity is insufficient, the oil suction is supplemented through the first hole. This improves the oil suction capacity of the plunger structure, increases the operating speed of the plunger hydraulic pump, improves the power, and solves the hazards such as cavitation and noise caused by air suction.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A plunger structure of a plunger hydraulic pump, characterized in that: It includes: a plunger body, a plunger ball head and a one-way throttle valve; The plunger ball head is connected to one end of the plunger body, the plunger body is provided with a hollow cavity, and one end of the hollow cavity is provided with an open structure; At least one first channel is provided on the plunger body, and the first channel communicates the hollow cavity with the outside of the plunger body; The one-way throttle valve is arranged in the hollow cavity and is used to open and close the first channel; Wherein, the first channel is provided at the one end of the plunger body to connect the other end of the hollow cavity with the outside of the plunger body; When the one-way throttle valve is in the first state, the valve core head of the one-way throttle valve abuts against one end of the plunger body provided with the first hole, and the valve core head abuts against the other end of the hollow cavity. When the plunger hydraulic pump presses oil, the one-way throttle valve closes the first hole, so that the oil in the hollow cavity is pressed out through the opening structure of the hollow cavity; Under the action of the negative pressure in the hollow cavity, when the one-way throttle valve is in the second state, the valve core head is away from one end of the plunger body provided with the first channel, and the valve core head is away from the other end of the hollow cavity. When the plunger structure does not absorb enough oil, the first channel is in an open state, and the outside of the plunger structure is connected to the hollow cavity through the opened first channel, so that the plunger structure sucks the oil outside the plunger body into the hollow cavity through the first channel.

2. The plunger structure of the plunger hydraulic pump according to claim 1, characterized in that: The one-way throttle valve comprises a valve core, an elastic member and a valve seat; The valve seat is fixedly connected to the inner wall of the hollow cavity, and a through guide channel is provided in the middle of the valve seat; The valve core also includes a valve core rod, and the valve core rod is inserted into the guide channel; The elastic member is sleeved on the valve core rod, and two ends of the elastic member abut against the valve core head and the valve seat respectively.

3. The plunger structure of the plunger type hydraulic pump according to claim 2, characterized in that: The other end of the hollow cavity is configured as a conical structure, and the valve core head is configured as a conical structure matching the other end of the hollow cavity.

4. The plunger structure of the plunger type hydraulic pump according to claim 2, characterized in that: The other end of the hollow cavity is configured as a spherical structure, and the valve core head is configured as a spherical structure matching the other end of the hollow cavity.

5. The plunger structure of the plunger hydraulic pump according to claim 2, characterized in that: Two retaining spring grooves are arranged in the circumferential direction of the inner side wall of the hollow cavity, retaining springs are arranged in the retaining spring grooves, and the valve seat is arranged between the two retaining springs.

6. The plunger structure of the plunger hydraulic pump according to claim 2, characterized in that: A plurality of second channels are arranged on the valve seat.

7. The plunger structure of the plunger hydraulic pump according to claim 2, characterized in that: The plunger ball head is provided with a throttle hole, and the throttle hole is communicated with the hollow cavity.

8. The plunger structure of the plunger type hydraulic pump according to claim 7, characterized in that: The valve core is provided with a throttling channel, and the throttling channel passes through the valve core head and the valve core rod; When the one-way throttle valve is in the first state, the throttle channel is connected to the throttle hole.

9. A plunger hydraulic pump, characterized in that: A plunger structure comprising a plunger hydraulic pump as claimed in any one of claims 1 to 8.

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