Balance valve element, balance valve and fluid control assembly

Abstract

The invention belongs to the technical field of hydraulic pressure, and discloses a balance valve element, a balance valve and a fluid control assembly. The balance valve element comprises a valve element body and a one-way valve assembly, an oil inlet flow channel is formed in the valve element body, the one-way valve assembly comprises a limiting part and a one-way valve element, the limiting part is arranged at the oil inlet end of the oil inlet flow channel, the one-way valve element is arranged in the oil inlet flow channel in a sliding mode and elastically connected with the valve element body, and the one-way valve element can be selectively separated from or abut against the limiting part. The one-way valve assembly is integrated in the valve element body, the axial size of the balance valve element is reduced, the whole balance valve element structure is more compact, the requirement for the coaxiality of the valve element body and the one-way valve assembly in the machining process is lowered, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, and in particular to a balancing valve core, a balancing valve and a fluid control component. Background Art

[0002] At present, a large number of hydraulic lifting and lowering circuits are used in the construction machinery industry. The balance valve plays the role of load holding, load control, and load smooth lowering in controlling the lifting and lowering circuit. Therefore, the performance of the balance valve directly affects the performance of the hydraulic press.

[0003] The existing balancing valve with one-way shut-off function mainly includes a valve sleeve, a main valve core and a one-way valve core. The main valve core and the one-way valve core are both assembled in the valve sleeve. The axial size of the balancing valve is too large, and the coaxiality requirements of the main valve core and the one-way valve core are high, and the processing difficulty is high.

[0004] Therefore, there is an urgent need for a balancing valve core, a balancing valve and a fluid control component to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a balancing valve core, integrate a one-way valve assembly inside a valve core body, reduce the size of the balancing valve core in the axial direction, and improve the integration of the balancing valve core.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Balancing valve core, including:

[0008] A valve core body, wherein an oil inlet passage is provided in the valve core body;

[0009] The one-way valve assembly includes a limit portion and a one-way valve core, wherein the limit portion is arranged at the oil inlet end of the oil inlet channel, the one-way valve core is slidably arranged in the oil inlet channel and is elastically connected to the valve core body, and the one-way valve core can selectively separate from or abut against the limit portion to open or close the oil inlet channel.

[0010] Optionally, the one-way valve core comprises:

[0011] A spherical body is disposed in the oil inlet passage and is located at an end of the limiting portion away from the oil inlet end;

[0012] A first elastic member, one end of the first elastic member abuts against the valve core body, and the other end abuts against the ball, and the first elastic member can apply a force to the ball to make the ball abut against the limiting portion.

[0013] Optionally, the limiting portion includes:

[0014] A limiting sleeve, the limiting sleeve is interference fitted in the oil inlet channel;

[0015] A retaining ring, a groove is provided on the inner wall of the oil inlet channel, the retaining ring is arranged in the groove, at least part of the retaining ring protrudes from the groove, and one end of the limiting sleeve away from the one-way valve core abuts against at least part of the retaining ring.

[0016] The object of the present invention is to provide a balancing valve. By adopting the above-mentioned balancing valve core, the volume of the balancing valve is reduced, the integration of the balancing valve is made higher, and the coaxiality requirement between the valve core body and the one-way valve assembly is reduced, the processing difficulty is reduced, and the production efficiency of the balancing valve is improved.

[0017] To achieve this object, the present invention adopts the following technical solutions:

[0018] A balancing valve, comprising the above-mentioned balancing valve core, the balancing valve further comprising:

[0019] A valve seat and a valve sleeve, wherein an assembly cavity is provided in the valve sleeve, wherein the balancing valve core is slidably disposed in the assembly cavity and elastically connected to the valve seat, wherein the valve sleeve comprises a first channel and a second channel, wherein the valve sleeve further comprises a valve port portion, wherein the valve port portion has a valve port, and the balancing valve core can open the valve port to allow the first channel and the second channel to communicate.

[0020] Optionally, the outer wall of the valve core body is also provided with an acting part, and the balancing valve includes a first working condition. Under the first working condition, the valve mouth part abuts against part of the acting part to close the valve port, and along the axial extension direction of the acting part, there is a flow gap between the valve mouth part and the acting part. Along the movement direction of the valve core body, the flow gap gradually decreases.

[0021] Optionally, a first flow portion is provided on the outer wall of the valve core body, a second flow portion is provided on the inner wall of the valve sleeve, a throttling channel is provided between the first flow portion and the second flow portion, and along the movement direction of the valve core body, the throttling channel is close to the second channel relative to the flow gap.

[0022] Optionally, the action portion includes a first inclined surface, the second flow portion includes a second inclined surface, and the slope of the first inclined surface is greater than the slope of the second inclined surface, so that the flow gap is formed between the action portion and the second flow portion.

[0023] Optionally, an oil passage is provided on the first flow portion, and the oil passage includes a guide groove and a sink groove, the first end of the guide groove is connected to the sink groove, the second end of the guide groove is connected to the throttling channel, and the width of the guide groove gradually increases from the first end to the second end.

[0024] Optionally, a sealing portion and a pilot portion are provided on the valve core body, the sealing portion is sealingly connected to the valve sleeve to separate a accommodating space in the valve sleeve, the pilot portion is located in the accommodating space, a throttling groove and a throttling plug are provided on the pilot portion, the throttling plug can be detachably arranged in the throttling groove, a throttling hole is provided on the throttling plug, and the throttling hole is configured to throttle the pilot oil.

[0025] The object of the present invention is to provide a fluid control assembly, so that the structure of the fluid control assembly is more compact and the layout of the fluid control assembly is more flexible.

[0026] To achieve this object, the present invention adopts the following technical solutions:

[0027] The fluid control component comprises a valve body and the above-mentioned balancing valve, wherein the valve body is provided with a valve cavity, and the balancing valve is inserted in the valve cavity.

[0028] Beneficial effects:

[0029] The balancing valve core provided by the present invention includes a valve core body and a one-way valve assembly. An oil inlet channel is provided in the valve core body. The one-way valve assembly includes a limiting portion and a one-way valve core. The limiting portion is arranged at the oil inlet end of the oil inlet channel. The one-way valve core is slidably arranged in the oil inlet channel and is elastically connected to the valve core body. The one-way valve core can selectively separate from or abut against the limiting portion to open or close the oil inlet channel. By integrating the one-way valve assembly inside the valve core body, the axial dimension of the balancing valve core is reduced, making the entire balancing valve core structure more compact, and reducing the coaxiality requirements of the valve core body and the one-way valve assembly during processing, thereby improving processing efficiency.

[0030] The balancing valve provided by the present invention reduces the coaxiality requirement between the valve core body and the one-way valve assembly by integrating the one-way valve assembly into the valve core body, reduces the processing difficulty, and improves the production efficiency of the balancing valve; and effectively utilizes the space inside the balancing valve, reduces the axial size of the balancing valve, and makes the balancing valve more integrated, thereby making it easier to install in various hydraulic systems.

[0031] The fluid control assembly provided by the present invention comprises a valve body and the above-mentioned balancing valve, wherein a valve cavity is provided in the valve body, and the balancing valve is inserted in the valve cavity, so that the structure of the fluid control assembly is more compact and the layout of the fluid control assembly is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional view of a balancing valve core provided in Embodiment 1 of the present invention;

[0033] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0034] Figure 3 is a cross-sectional view of a balancing valve provided in Embodiment 2 of the present invention;

[0035] Figure 4 yes Figure 3 The enlarged view of point B in the middle;

[0036] Figure 5 is a schematic diagram of the force-bearing surface of the action part provided in the second embodiment of the present invention;

[0037] Figure 6 is a structural schematic diagram of a valve core body provided in Embodiment 2 of the present invention;

[0038] Figure 7 It is a schematic diagram of the force bearing surface of the pilot part provided by the present invention.

[0039] In the figure:

[0040] 10. Balancing valve core;

[0041] 100, valve core body; 110, oil inlet channel; 111, groove; 120, first flow portion; 121, throttling channel; 130, action portion; 131, first inclined surface; 132, flow gap; 133, force surface of action portion; 134, recess; 140, oil port; 141, guide groove; 142, sink groove; 150, sealing portion; 151, third annular sealing groove; 152, third sealing ring; 160, pilot portion; 161, throttling groove; 162, throttling plug; 1621, throttling hole; 163, force surface of pilot portion; 170, second through hole;

[0042] 200, one-way valve assembly; 210, limiting portion; 211, limiting sleeve; 212, retaining ring; 220, one-way valve core; 221, ball; 222, first elastic member;

[0043] 300, valve body; 310, oil inlet; 320, oil outlet; 330, pilot oil port;

[0044] 400, valve seat; 410, second elastic member;

[0045] 500, valve sleeve; 510, assembly cavity; 520, second flow portion; 521, second inclined surface; 530, first through hole; 540, first channel; 550, first sealing ring; 560, second sealing ring; 570, second channel;

[0046] 1000, first sealing line;

[0047] 2000, the second sealing line. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0049] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0052] Embodiment 1

[0053] This embodiment provides a balancing valve core, such as Figure 1-Figure 2As shown, the balancing valve core 10 includes a valve core body 100 and a one-way valve assembly 200. The valve core body 100 is provided with an oil inlet channel 110. The one-way valve assembly 200 includes a limiting portion 210 and a one-way valve core 220. The limiting portion 210 is arranged at the oil inlet end of the oil inlet channel 110. The one-way valve core 220 is slidably arranged in the oil inlet channel 110 and is elastically connected to the valve core body 100. The one-way valve core 220 can selectively separate from or abut against the limiting portion 210 to open or close the oil inlet channel 110. By integrating the one-way valve assembly 200 inside the valve core body 100, the axial dimension of the balancing valve core 10 is reduced, making the structure of the entire balancing valve core 10 more compact, and reducing the coaxiality requirements of the valve core body 100 and the one-way valve assembly 200 during the processing process, thereby improving the processing efficiency.

[0054] In this embodiment, the oil inlet end of the valve core body 100 refers to the inlet of the liquid inlet channel. Figure 1 When placed from the perspective shown, the oil inlet end is located at the leftmost end of the valve core body 100 .

[0055] Alternatively, if Figure 1 As shown, the one-way valve core 220 includes a ball 221 and a first elastic member 222. The ball 221 is disposed in the oil inlet channel 110 and is located at the end of the limiting portion 210 away from the oil inlet end. The first elastic member 222 is disposed in the oil inlet channel 110. One end of the first elastic member 222 abuts against the valve core body 100, and the other end abuts against the ball 221. The first elastic member 222 can exert a force on the ball 221 to make the ball 221 abut against the limiting portion 210. It can be understood that when the oil inlet pressure of the oil inlet channel 110 is greater than the elastic force of the first elastic member 222, the first elastic member 222 is compressed and the oil inlet channel 110 is opened; when the oil inlet pressure is less than the pressure of the first elastic member 222, the first elastic member 222 drives the ball 221 to abut against the limiting portion 210 to form a first linear sealing structure (such as Figure 2 As shown), the oil inlet passage 110 is thereby closed.

[0056] In this embodiment, the first elastic member 222 is a spring, which can provide sufficient elastic force for the ball 221 to make the ball 221 abut against the limiting portion 210, thereby ensuring the sealing of the oil inlet channel 110 and responding more quickly when the oil inlet pressure changes, thereby improving the reliability of the balancing valve core 10.

[0057] Alternatively, if Figure 1As shown, the limiting part 210 includes a limiting sleeve 211 and a retaining ring 212. The limiting sleeve 211 is interference-fitted in the oil inlet flow channel 110. A groove 111 is provided on the inner wall of the oil inlet flow channel 110. The retaining ring 212 is arranged in the groove 111. At least part of the retaining ring 212 protrudes out of the groove 111. One end of the limiting sleeve 211 away from the one-way valve core 220 abuts against at least part of the retaining ring 212. By interference-fitting the limiting sleeve 211 in the oil inlet flow channel 110 and limiting the limiting sleeve 211 by the retaining ring 212, the double limiting structure ensures the stability of the limiting sleeve 211 in the oil inlet flow channel 110.

[0058] In this embodiment, the retaining ring 212 is a steel wire retaining ring 212, and the ball 221 is a steel ball, which not only enhances the wear resistance and strength of the one-way valve assembly 200, but also ensures that the one-way valve assembly 200 can still maintain stable performance under high pressure and high frequency working conditions.

[0059] Embodiment 2

[0060] This embodiment provides a balancing valve, at least part of which is inserted into a valve body 300, the valve body 300 includes a valve cavity, and the valve cavity has an oil inlet 310 and an oil outlet 320; Figure 3 As shown, the balancing valve includes the balancing valve core 10 in the first embodiment, and the balancing valve also includes a valve seat 400 and a valve sleeve 500. The valve sleeve 500 is arranged in the valve cavity and is sealed with the valve body 300. An assembly cavity 510 is provided in the valve sleeve 500. The valve seat 400 is arranged at one end of the valve body 300. The balancing valve core 10 is slidably arranged in the assembly cavity 510 and is elastically connected with the valve seat 400. The valve sleeve 500 includes a first channel 540 and a second channel 570. The first channel 540 is connected to the oil inlet 310, and the second channel 570 is connected to the oil outlet 320. The valve sleeve 500 also includes a valve port portion, which has a valve port. The balancing valve core 10 can open the valve port to connect the first channel 540 and the second channel 570, so that the oil inlet 310 is connected to the oil outlet 320, and the oil cylinder descends. The balancing valve in this embodiment integrates the one-way valve assembly 200 into the valve core body 100, thereby reducing the coaxiality requirement between the valve core body 100 and the one-way valve assembly 200, reducing the processing difficulty, and improving the production efficiency of the balancing valve; and, effectively utilizing the space inside the balancing valve, reducing the axial size of the balancing valve, making the balancing valve more integrated, thereby making it easier to install in various hydraulic systems.

[0061] For example, the valve port is closed as the first working condition ( Figure 3As shown), when the valve port is opened, it is the second working condition. When the balancing valve switches from the first working condition to the second working condition, the movement direction of the valve core body 100 is from right to left. At this time, the hydraulic oil enters the assembly cavity 510 of the valve sleeve 500 from the second channel 570, and flows through the throttling channel 121, the flow gap 132, and the first channel 540 in sequence.

[0062] like Figure 4 As shown, the outer wall of the valve core body 100 is also provided with an action portion 130, and the valve sleeve 500 includes a valve mouth portion, which has a valve mouth. In the first working condition, the valve mouth portion partially abuts against the action portion 130 to close the valve mouth. Along the axial extension direction of the action portion 130, there is a flow gap 132 between the valve mouth portion and the action portion 130. Along the movement direction of the valve core body 100, the flow gap 132 gradually decreases, which can increase the action area of ​​the large oil and ensure that the oil smoothly pushes the valve core body 100 to move. It should be noted that the projection of the first inclined surface 131 in the axial direction of the valve core body 100 is the force surface 133 of the action portion of the valve core body 100, as shown in FIG. Figure 5 shown.

[0063] Alternatively, if Figure 4 As shown, the outer wall of the valve core body 100 is provided with a first flow portion 120, the inner wall of the valve sleeve 500 is provided with a second flow portion 520, and a throttling channel 121 is provided between the first flow portion 120 and the second flow portion 520. By setting the throttling channel 121, when the valve core body 100 opens the return oil flow channel assembly cavity 510, a throttling effect can be achieved, and the movement speed of the valve core body 100 can be effectively controlled. When the balancing valve is switched from the first working condition to the second working condition, the throttling effect of the throttling channel 121 and the inclined action portion 130 are used to ensure the effective contact area, so as to prevent the valve core body 100 from being quickly pushed open by the hydraulic oil, so as to achieve the slow and smooth movement of the valve core body 100 and play a good buffering role.

[0064] Alternatively, if Figure 4 As shown, the action portion 130 includes a first inclined surface 131, and the second flow portion 520 includes a second inclined surface 521. The slope of the first inclined surface 131 is greater than the slope of the second inclined surface 521, so that a flow gap 132 is formed between the action portion 130 and the second flow portion 520. The flow gap 132 decreases from the side close to the first flow portion 120 to the side close to the second flow portion 520, thereby increasing the force area of ​​the valve core body 100. In addition, the presence of the first inclined surface 131 can make the hydraulic oil produce a relatively smooth thrust when contacting the valve core body 100, thereby ensuring the stability of the movement of the valve core body 100. In this embodiment, under the first working condition, the second flow portion 520 abuts against the action portion 130 to form a second linear sealing structure. The second linear sealing structure can improve the response speed and reliability of the hydraulic system, and provide users with higher operating accuracy and safety.

[0065] Alternatively, if Figure 4 As shown, the action portion 130 also includes a recess 134, which is located between the action portion 130 and the first flow portion 120, and the recess 134 is concave inward along the radial direction of the valve core body 100, which can reduce the radial size of the valve core body 100, reduce the contact area between the valve core body 100 and the valve sleeve 500, and further reduce the wear of the valve core body 100.

[0066] Alternatively, if Figure 6 As shown, the first flow portion 120 is also provided with an oil port 140, and the oil port 140 includes a guide groove 141 and a sink groove 142. The first end of the guide groove 141 is connected to the sink groove 142, and the second end of the guide groove 141 is connected to the throttling channel 121. The width of the first end of the guide groove 141 is greater than the width of the second end of the guide groove 141. The oil port 140 adopts a combined design of the guide groove 141 and the sink groove 142, which reduces the contact area between the valve core body 100 and the valve sleeve 500, reduces the friction resistance of the valve core movement, can smoothly open the oil port 140 on the valve core body 100, can smoothly control the descending speed of the oil cylinder, and reduces the impact and shaking of the hydraulic system. In this embodiment, the guide groove 141 is a conical groove, and the sink groove 142 is a waist-shaped sink groove.

[0067] Optionally, the balancing valve further comprises a second elastic member 410, and a limiting groove is provided at the inlet end of the oil inlet channel 110. One end of the second elastic member 410 abuts against the valve seat 400, and the other end is located in the limiting groove and abuts against the valve core body 100. The provision of the second elastic member 410 can provide a reset elastic force for the valve core body 100. After the oil cylinder is lowered into place, the second elastic member 410 can drive the valve core body 100 to reset, so that a second linear sealing structure is formed between the valve core body 100 and the valve sleeve 500, and prepare for the next lifting. In this embodiment, the second elastic member 410 is a spring, which can provide a stable reset force to ensure that the valve core body 100 can quickly return to its original position after the oil cylinder is lowered.

[0068] Alternatively, if Figure 3As shown, the valve core body 100 is provided with a sealing part 150 and a pilot part 160, and the sealing part 150 is sealedly connected with the valve sleeve 500 to separate a receiving space in the valve sleeve 500, and the pilot part 160 is located in the receiving space, and the pilot part 160 is provided with a throttling groove 161 and a throttling plug 162, and the throttling plug 162 can be detachably arranged on the throttling groove 161, and the throttling plug 162 is provided with a throttling hole 1621. In the case that the return oil pressure in the assembly chamber 510 is insufficient during the lowering process of the oil cylinder, the pilot oil is introduced into the throttling groove 161, and the pilot oil flows out through the throttling hole 1621, and the pilot oil flowing out of the throttling hole 1621 enters the receiving space surrounded by the valve body 300, the pilot part 160 and the valve sleeve 500, so as to provide the valve core body 100 with the elastic force to overcome the second elastic member 410, and ensure that the oil cylinder is lowered into place.

[0069] It can be understood that a first through hole 530 is provided on the valve sleeve 500, and a second through hole 170 is provided on the pilot part 160. The pilot oil port 330, the first through hole 530 and the second through hole 170 are connected in sequence, and the second through hole 170 is connected to the throttling groove 161, so that the pilot oil can flow out from the throttling hole 1621 and enter the accommodating space. The pressure of the pilot oil acts on the rightmost end of the pilot part 160 (on the force surface 163 of the pilot part), and with the help of the pressure of the pilot oil, the valve core body 100 is driven to continue to compress the second elastic member 410 to ensure that the valve port is in an open state until the cylinder drops into place.

[0070] Optionally, a first annular sealing groove and a second annular sealing groove are provided at intervals along the axial direction of the valve core body 100, the first annular sealing groove is located between the oil inlet 310 and the oil outlet 320, and the second annular sealing groove is located between the oil outlet 320 and the pilot oil port 330. A first sealing ring 550 is provided in the first annular sealing groove, and the first sealing ring 550 can prevent oil from flowing through the valve cavity between the oil inlet 310 and the oil outlet 320, and a second sealing ring 560 is provided in the second annular sealing groove, and the second sealing ring 560 can prevent oil from flowing through the valve cavity between the oil outlet 320 and the pilot oil port 330, thereby ensuring that no cross leakage of hydraulic oil occurs between the oil circuits, thereby maintaining the stability and safety of the system.

[0071] Optionally, a third annular sealing groove 151 is provided on the sealing portion 150 , a third sealing ring 152 is provided in the third annular sealing groove 151 , and the third sealing ring 152 is used to prevent oil from flowing between the oil outlet 320 and the pilot oil port 330 through the space in the valve sleeve 500 .

[0072] Embodiment 3

[0073] This embodiment also provides a fluid control component, including a valve body 300 and the balancing valve in embodiment 2. The valve body 300 is provided with a valve cavity, and the balancing valve is inserted in the valve cavity, so that the structure of the fluid control component is more compact and the layout of the fluid control component is more flexible.

[0074] Specifically, a valve cavity is provided on the valve body 300, and the valve cavity has an oil inlet 310, an oil outlet 320 and a pilot oil port 330, and a balancing valve is inserted in the valve cavity. The detailed working process of the fluid control assembly provided in this embodiment is as follows:

[0075] When the oil cylinder needs to rise, the oil outlet 320 is connected to the oil inlet 310 of the oil cylinder, and then oil is injected into the balance valve through the oil inlet 310. The oil enters the valve core body 100 through the first channel 540 on the valve sleeve 500, and the pressure of the oil acts on the abutment between the ball 221 and the limit sleeve 211 ( Figure 2 When the pressure exceeds the elastic force of the first elastic member 222, the ball 221 is driven to move rightward, thereby guiding the oil in the oil inlet 310 to the oil outlet 320, so as to achieve the purpose of controlling the oil cylinder to rise;

[0076] When the oil cylinder is required to descend, the pressure oil of the oil outlet 320 acts on the oil cylinder through the second channel 570, the oil port 140, the throttling channel 121, and the flow gap 132. Figure 4 At the second sealing line 2000 in the middle, when the pressure exceeds the pre-tightening force of the second elastic member 410, the valve core body 100 is driven to move left, the pressure oil is unloaded, and the oil cylinder descends; the structure of the guide groove 141 plus the sink groove 142 reduces the contact area between the valve core body 100 and the valve sleeve 500, reduces the friction force of the movement of the valve core body 100, and can smoothly open the oil port 140 of the valve core body 100, so as to smoothly control the descending speed and reduce the impact and shaking of the hydraulic system;

[0077] When the pressure oil of the oil outlet 320 is insufficient to overcome the elastic force of the second elastic member 410, the pilot oil enters the second through hole 170 of the valve core body 100 through the pilot oil port 330 and the first through hole 530, and enters the rightmost accommodation space of the valve core body 100 through the throttling groove 161 on the valve core body 100 and the throttling hole 1621 on the throttling plug 162. The pilot part force surface 163 is the rightmost surface of the pilot part 160 (such as Figure 7 As shown), the valve core body 100 moves leftward, the pressure oil is unloaded, and the oil cylinder continues to descend until it descends to the initial position before the rise. The throttling groove 161 and the throttling hole 1621 can play a certain buffering role in the process of the oil cylinder descending, reducing the impact of the pressure of the pilot oil on the valve core body 100, and improving the stability of the movement of the valve core body 100.

[0078] Optionally, a fourth annular sealing groove is provided on the valve seat 400 , a fourth sealing ring is provided in the fourth annular sealing groove, and the fourth sealing ring is used to seal the connection between the valve seat 400 and the valve body 300 to prevent leakage of hydraulic oil in the valve cavity.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Balancing valve core, characterized in that: include: A valve core body (100), wherein an oil inlet passage (110) is provided in the valve core body (100); The one-way valve assembly (200) comprises a limit portion (210) and a one-way valve core (220), wherein the limit portion (210) is arranged at the oil inlet end of the oil inlet channel (110), and the one-way valve core (220) is slidably arranged in the oil inlet channel (110) and elastically connected to the valve core body (100), and the one-way valve core (220) can selectively separate from or abut against the limit portion (210) to open or close the oil inlet channel (110).

2. The balancing valve core according to claim 1, characterized in that: The one-way valve core (220) comprises: A spherical body (221) is disposed in the oil inlet channel (110) and is located at an end of the limiting portion (210) away from the oil inlet end; A first elastic member (222), one end of the first elastic member (222) abuts against the valve core body (100), and the other end abuts against the ball (221), and the first elastic member (222) can exert a force on the ball (221) so that the ball (221) abuts against the limiting portion (210).

3. The balancing valve core according to claim 1, characterized in that: The limiting portion (210) comprises: A limiting sleeve (211), wherein the limiting sleeve (211) is interference-fitted in the oil inlet passage (110); A retaining ring (212), a groove (111) is provided on the inner wall of the oil inlet channel (110), the retaining ring (212) is arranged in the groove (111), at least a portion of the retaining ring (212) protrudes from the groove (111), and an end of the limiting sleeve (211) away from the one-way valve core (220) abuts against at least a portion of the retaining ring (212).

4. Balancing valve, characterized in that: The balancing valve comprises a valve core according to any one of claims 1 to 3, wherein the balancing valve further comprises: A valve seat (400) and a valve sleeve (500), wherein an assembly cavity (510) is provided in the valve sleeve (500), wherein the balancing valve core (10) is slidably disposed in the assembly cavity (510) and elastically connected to the valve seat (400), wherein the valve sleeve (500) comprises a first channel (540) and a second channel (570), wherein the valve sleeve (500) further comprises a valve opening portion, wherein the valve opening portion has a valve opening, and the balancing valve core (10) is capable of opening the valve opening to allow the first channel (540) and the second channel (570) to communicate.

5. The balancing valve according to claim 4, characterized in that: The outer wall of the valve core body (100) is also provided with an acting portion (130), and the balancing valve includes a first working condition. Under the first working condition, the valve mouth portion abuts against part of the acting portion (130) to close the valve mouth, and along the axial extension direction of the acting portion (130), there is a flow gap (132) between the valve mouth portion and the acting portion (130), and along the movement direction of the valve core body (100), the flow gap (132) gradually decreases.

6. The balancing valve according to claim 5, characterized in that: The outer wall of the valve core body (100) is provided with a first flow portion (120), the inner wall of the valve sleeve (500) is provided with a second flow portion (520), and a throttling channel (121) is provided between the first flow portion (120) and the second flow portion (520). Along the movement direction of the valve core body (100), the throttling channel (121) is close to the second channel (570) relative to the flow gap (132).

7. The balancing valve according to claim 6, characterized in that: The action portion (130) includes a first inclined surface (131), and the second flow portion (520) includes a second inclined surface (521), and the slope of the first inclined surface (131) is greater than the slope of the second inclined surface (521), so that the flow gap (132) is formed between the action portion (130) and the second flow portion (520).

8. The balancing valve according to claim 6, characterized in that: The first flow portion (120) is provided with an oil passage port (140), the oil passage port (140) comprising a guide groove (141) and a sink groove (142), the first end of the guide groove (141) being in communication with the sink groove (142), the second end of the guide groove (141) being in communication with the throttling channel (121), and the width of the guide groove (141) gradually increasing from the first end to the second end.

9. The balancing valve according to claim 4, characterized in that: The valve core body (100) is provided with a sealing portion (150) and a pilot portion (160). The sealing portion (150) is sealedly connected to the valve sleeve (500) to separate a receiving space in the valve sleeve (500). The pilot portion (160) is located in the receiving space. The pilot portion (160) is provided with a throttling groove (161) and a throttling plug (162). The throttling plug (162) can be detachably arranged in the throttling groove (161). The throttling plug (162) is provided with a throttling hole (1621), and the throttling hole (1621) is configured to throttle the pilot oil.

10. A fluid control assembly, characterized in that: It comprises a valve body (300) and a balancing valve as claimed in any one of claims 4 to 9, wherein a valve cavity is provided in the valve body (300), and the balancing valve is inserted in the valve cavity.

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