TWI850981B - Diaphragm throttle and hydrostatic device using the same - Google Patents

Abstract

The diaphragm throttle of the present invention comprises a body, a cover plate and a diaphragm. The body has a body oil inlet channel, a body oil outlet channel, a throttling portion and a diaphragm supporting portion. The throttling portion has a throttling channel connected to the body oil outlet channel. The diaphragm supporting portion surrounds the throttling portion and has a plurality of grooves arranged at equal intervals. The grooves are connected to the body oil inlet channel and the body oil outlet channel. The diaphragm is arranged between the diaphragm supporting portion and the cover plate. Thereby, the diaphragm throttle of the present invention can improve the uniformity of diaphragm deformation. In addition, the present invention further provides a hydrostatic device using the above-mentioned diaphragm throttle.

Description

Diaphragm throttle and hydrostatic device using the same

The present invention relates to a hydrostatic linear slide, and more particularly to a diaphragm throttle and a hydrostatic device using the same.

Hydrostatic linear slides mainly use a certain pressure to fill the lubricating oil into the oil cavity of the slide, so that the slide can smoothly move linearly along the track without friction through the oil film formed by the lubricating oil. In order to increase the load-bearing stiffness and stability of the oil film, the current practice is to set a set of throttles between the oil supply end and the oil cavity to provide a throttling effect on the lubricating oil. However, the traditional configuration method is to match one oil cavity with one set of throttles, which will lead to increased costs and relatively poor space utilization.

CN 216742467 U discloses a flow controller of a hydrostatic pressure device. When the load pressure changes, the diaphragm will produce a corresponding deformation, so that the volume of the pressure-stabilizing chamber changes with the deformation of the diaphragm, thereby controlling the flow of the oil outlet. However, in the aforementioned patent, the pressure-stabilizing chamber is annular and lacks a structure that can make the pressure uniform, which causes the diaphragm to deform unevenly when subjected to the pressure applied by the pressure-stabilizing chamber, thereby affecting the flow control effect.

The hydrostatic linear system disclosed in CN 209925429 U connects a throttling assembly to multiple hydrostatic oil chambers of a slider body through an oil delivery pipe to provide high-pressure oil to each of the hydrostatic oil chambers. However, the aforementioned structure is only a common configuration, and the aforementioned patent does not disclose how the throttling assembly provides a throttling effect.

The main purpose of the present invention is to provide a membrane throttle that can improve rigidity and stability.

In order to achieve the above main purpose, the film throttle of the present invention comprises a body, at least one cover plate, and at least one diaphragm. The body has a body oil inlet channel, at least one body oil outlet channel, at least one throttling part and at least one diaphragm supporting part. The throttling part has a throttling surface and a throttling channel. One end of the throttling channel penetrates the throttling surface, and the other end of the throttling channel is connected to the body oil outlet channel. The diaphragm supporting part surrounds the throttling part, and the diaphragm supporting part has a plurality of grooves arranged at equal intervals relative to the throttling part; the cover plate is arranged in the body; the diaphragm is arranged between the diaphragm supporting part of the body and the cover plate.

From the above, it can be seen that the diaphragm throttle of the present invention uses the grooves arranged at equal intervals to provide uniform pressure to the diaphragm, so that the diaphragm can produce stable and uniform deformation when subjected to pressure, thereby achieving the effect of improving rigidity stability.

Preferably, the body further has at least one lower pressure groove, the lower pressure groove is located between the throttling portion and the diaphragm supporting portion and is connected to the body oil inlet channel and the grooves, and the cover plate corresponds to the lower pressure groove and has an upper pressure groove connected to the body oil inlet channel. In this way, the diaphragm can be uniformly deformed when subjected to pressure.

Preferably, the body further has a body oil inlet groove penetrating the diaphragm supporting portion, the body oil inlet passage indirectly connects the upper pressure groove and the lower pressure groove via the body oil inlet groove, the width of each groove is equal to the width of the body oil inlet groove, and the grooves and the body oil inlet groove are arranged at equal intervals relative to the throttling portion. In this way, the diaphragm can be uniformly deformed when subjected to pressure.

Preferably, the cover plate has a top surface, a bottom surface and an oil guide hole, the oil guide hole penetrates the top surface and the bottom surface and is connected to the main body oil inlet groove and the upper pressure groove, the bottom surface of the cover plate has a positioning portion surrounding the upper pressure groove, and the diaphragm is sandwiched between the diaphragm supporting portion of the main body and the positioning portion of the cover plate, so that the diaphragm has a good positioning effect.

Preferably, the gap is between 80 μm and 90 μm, which can provide a relatively good throttling effect.

Preferably, the main body oil outlet channel, the throttling portion, the diaphragm supporting portion, the lower pressure groove, the cover plate, and the diaphragm can be provided in two parts according to actual needs, so that the film throttle of the present invention can be used in conjunction with two oil chambers at the same time to save costs and improve space utilization.

A second object of the present invention is to provide a hydrostatic pressure device that can increase space utilization and has high rigidity.

In order to achieve the above-mentioned secondary purpose, the hydraulic pressure device of the present invention includes a hydraulic pressure slide and a film throttle. The hydraulic pressure linear slide has a track and a slide block slidably arranged on the track, the track has two oppositely arranged first load surfaces, the slide block has two oppositely arranged second load surfaces, the first load surfaces of the track respectively correspond to the second load surfaces of the slide block, each of the second load surfaces of the slide block has an oil cavity, and the slide block has two slide block oil inlet channels, each of the slide block oil inlet channels is connected to one of the oil cavities. The film throttle includes a body, two cover plates, and two diaphragms. The body has a body oil inlet channel, two body oil outlet channels, Two throttling parts, two diaphragm bearing parts and two lower pressure grooves, each of the throttling parts has a throttling surface and a throttling channel, one end of each throttling channel penetrates one of the throttling surfaces, and the other end of each throttling channel is connected to one of the main body oil outlet channels, each of the diaphragm bearing parts surrounds one of the throttling parts, and each of the diaphragm bearing parts has a plurality of grooves arranged at equal intervals relative to the throttling part, and each of the lower pressure grooves is located between one of the throttling parts and one of the diaphragm bearing parts. The cover plates are arranged in the body and correspond to the lower pressure grooves, and each cover plate has an upper pressure groove connected to the body oil inlet passage; each diaphragm is arranged between the upper pressure groove and the lower pressure groove and positioned between the diaphragm supporting portion of the body and the cover plate, wherein the film throttle is connected to the slide block oil inlet passages of the slide block through the body oil outlet passages.

From the above, it can be seen that the hydrostatic device of the present invention utilizes the body oil outlet channels of the body in conjunction with the oil chambers of the slide block, so only one set of the diaphragm throttle is required instead of multiple sets as in the prior art, so as to achieve the effect of saving costs and improving space utilization.

Preferably, an oil circuit transfer block is arranged between the slide block and the film throttle, and the oil circuit transfer block has two first transfer channels and two second transfer channels arranged opposite to each other, wherein a throttle tube is arranged in each of the first transfer channels. In addition, the track has four first load surfaces in pairs of two, the slide block has four second load surfaces in pairs of two and four slide block oil inlet channels in pairs of two, wherein two of the slide block oil inlet channels are connected to the throttle tubes, and the other two slide block oil inlet channels are connected to the second transfer channels of the oil circuit transfer block, and the second transfer channels of the oil circuit transfer block are connected to the body oil outlet channels of the film throttle.

Preferably, each throttle tube has an oil outlet channel and a throttle hole axially connected to the oil outlet channel, and the diameter of the throttle hole is between 0.1mm and 0.3mm. In this way, each throttle tube is connected to one of the slide block oil inlet channels of the slide block through the oil outlet channel, and provides a throttling effect to the hydraulic oil entering the first transfer channel through the throttle hole.

The detailed structure, features, assembly or use of the diaphragm throttle and the hydrostatic linear slide assembly using the diaphragm throttle provided by the present invention will be described in the detailed description of the implementation method to be described later. However, those with ordinary knowledge in the field of the present invention should understand that the detailed description and the specific embodiments listed for implementing the present invention are only used to illustrate the present invention and are not used to limit the scope of the patent application of the present invention.

The applicant first explains that in the entire specification, including the embodiments described below and the claims of the patent application, the terms related to direction are based on the directions in the drawings. Secondly, in the embodiments and drawings to be described below, the same component numbers represent the same or similar components or their structural features.

Please refer to FIG. 1 and FIG. 2 , the membrane throttle 10 of the present invention includes a body 20 , two cover plates 30 , and two diaphragms 40 .

The body 20 has a base 21 and a top cover 22. The top surface of the base 21 has four first screw holes 212 and two second screw holes 214. The top cover 22 has four first countersunk holes 222 and two second countersunk holes 224 that penetrate through its top and bottom surfaces. On the one hand, four first countersunk screws S1 are inserted through the first countersunk holes 222 and locked to the first screw holes 212. On the other hand, two second countersunk screws S2 are inserted through the second countersunk holes 224 and locked to the second screw holes 214, so that the base 21 and the top cover 22 are fixed together. As shown in Figures 2, 5 and 6, the base 21 has a body oil inlet channel 23, a body oil inlet groove 24, two body oil outlet channels 25 and 26 that are arranged opposite to each other. Two oppositely arranged throttling parts 26, two oppositely arranged diaphragm supporting parts 27, two oppositely arranged lower pressure grooves 28, and two oppositely arranged flanges 29, wherein one end of the body oil inlet channel 23 forms an oil inlet port 232 on one side of the body 20, and the other end of the body oil inlet channel 23 is connected to the body oil inlet groove 24; the body oil outlet channels 25 are located on two opposite sides of the body oil inlet channel 23, and one end of the body oil outlet channels 25 is at The same side surface of the body 20 is formed with an oil outlet 252; each throttling portion 26 has a throttling surface 262 and a throttling channel 264, one end of the throttling channel 264 penetrates the throttling surface 262, and the other end of the throttling channel 264 is connected to the body oil outlet channel 25 (as shown in FIG. 6); the diaphragm supporting portions 27 surround the throttling portions 26 and are penetrated by the body oil inlet groove 24, and the height of the diaphragm supporting portions 27 is higher than that of the throttling portions. 26, in addition, each diaphragm supporting portion 27 has a plurality of grooves 272, the number of which can be three as shown in FIG. 3 or two as shown in FIG. 4. In the present embodiment, the number of the grooves 272 is three. However, regardless of whether the grooves 272 are two or three, the grooves 272 and the main body oil inlet groove 24 are arranged at equal intervals relative to the throttling portion 26, and the width of the grooves 272 is equal to the width of the main body oil inlet groove 24. ; Each lower pressure groove 28 is located between the throttling portion 26 and the diaphragm supporting portion 27. On the one hand, it is indirectly connected to the main body oil inlet channel 23 through the main body oil inlet groove 24, and on the other hand, it is directly connected to the grooves 272; the flanges 29 are located above the diaphragm supporting portions 27 and surround the diaphragm supporting portions 27 and are penetrated by the main body oil inlet groove 24. Each flange 29 has a plurality of fixing holes 292 (the number is not limited) arranged at equal intervals.

The cover plate 30 has a top surface 31, a bottom surface 32, an oil guide hole 33 penetrating the top surface 31 and the bottom surface 32, and a plurality of through holes 34 (the number is not limited) penetrating the top surface 31 and the bottom surface 32. In addition, the bottom surface 32 of the cover plate 30 has an annular positioning portion 35 and an upper pressure groove 36 surrounded by the positioning portion 35, wherein the upper pressure groove 36 is axially connected to the oil guide hole 33. As shown in FIG. 2 and FIG. 6, the cover plate 30 is disposed in the base 21 and is fixed to the base 21 by a plurality of fixing members (such as screws, not shown in the figure) penetrating the through holes 34 and locking them in the fixing holes 292. Thereby, the upper pressure groove 36 corresponds to the lower pressure groove 28 and is indirectly connected to the main body oil inlet channel 23 via the oil guide hole 33 .

The diaphragm 40 is made of metal. As shown in FIG. 2 and FIG. 6 , the diaphragm 40 is disposed between the upper pressure groove 36 and the lower pressure groove 28 and sandwiched between the diaphragm support portion 27 of the body 20 and the positioning portion 35 of the cover plate 30 . In addition, as shown in FIG. 7 , since the height of the diaphragm support portion 27 is higher than the height of the throttling portion 26 , a gap G connecting the lower pressure groove 28 and the throttling channel 264 is generated between the bottom surface 42 of the diaphragm 40 and the throttling surface 262 of the throttling portion 26 of the body 20 . The gap G is between 80 μm and 90 μm in this embodiment. Such a size design can provide a relatively good throttling effect.

As can be seen from the above, when the hydraulic oil enters the body 20 from the body oil inlet channel 23, it is divided into two streams of oil, as shown in FIG. 6. One stream of oil flows from the body oil inlet groove 24 to the upper pressure groove 36 through the oil guide hole 33, and the other stream of oil flows from the body oil inlet groove 24 to the lower pressure groove 28 and the grooves 272 and flows through the gap G to the throttling channel 264, and finally flows from the throttling channel 264 to the body oil outlet channel 25 and flows out of the body 20. Once the hydraulic oil flowing out of the body 20 from the body oil outlet passage 25 is subjected to a load, the diaphragm 40 will be subjected to the oil pressure in the lower pressure groove 28 and the grooves 272 and will bend and deform upward, so that the gap G becomes larger. At this time, the flow rate of the hydraulic oil flowing from the lower pressure groove 28 through the throttling passage 264 to the body oil outlet passage 25 will increase, thereby achieving a flow control effect and improving the load-bearing rigidity. When the load disappears, the pressure on the diaphragm 40 disappears and the diaphragm 40 returns to its original state. In other words, the diaphragm throttle 10 of the present invention utilizes the lower pressure groove 28 in combination with the grooves 272 arranged at equal intervals to provide uniform pressure to the diaphragm 40 (as shown in FIGS. 3 and 4 ), so that the diaphragm 40 can produce stable and uniform deformation when subjected to pressure, thereby achieving the effect of improving rigidity stability.

It should be noted that the main body 20 can have different structural changes according to actual needs. For example, at least one of the main body oil outlet channel 25, the throttling portion 26, the diaphragm supporting portion 27, the lower pressure groove 28 and the flange 29 only needs to be provided. In this case, at least one of the cover plate 30 and the diaphragm 40 only needs to be provided. Such a structural configuration can also allow the diaphragm 40 to produce stable and uniform deformation when subjected to pressure, thereby achieving the purpose of the present invention.

Please refer to FIG. 8 and FIG. 9 again. The present invention further provides a hydrostatic pressure device 50 using the aforementioned diaphragm throttle 10. In addition to the aforementioned diaphragm throttle 10, the hydrostatic pressure device 50 of the present invention also includes a rail 60, a slide block 70, an oil circuit adapter block 80, and two throttle tubes 90.

As shown in FIG. 10 , two opposite side surfaces of the rail 60 respectively have two first load-bearing portions 61 that are opposite to each other in upper and lower directions. Each first load-bearing portion 61 has a first load surface 62 .

The slider 70 is slidably disposed on the rail 60. As shown in FIG. 10 , the slider 70 has two second load portions 71 opposite to each other on the left and right sides, each second load portion 71 is located between two first load portions 61 opposite to each other on the upper and lower sides of the rail 60, and each second load portion 71 has two second load surfaces 72 opposite to each other on the upper and lower sides, and the second load surfaces 72 of the slider 70 correspond to the first load surfaces 62 of the rail 60 in a one-to-one manner. In addition, each second load surface 72 of the slider 70 has an oil cavity 73, and the slider 70 has two first slider oil inlet channels 74 and two second slider oil inlet channels 75. The first slider oil inlet channels 74 and the second slider oil inlet channels 75 are arranged in pairs and vertically side by side on the outer side of the second load parts 71 and are connected to the oil cavities 73 in a one-to-one manner through a plurality of oil guide channels 76 (the number is not limited).

The oil circuit transfer block 80 is disposed between the slide block 70 and the film throttle 10. The oil circuit transfer block 80 has two first transfer channels 81 and two second transfer channels 82 disposed opposite to each other inside. As shown in FIG9 , one end of the first transfer channels 81 is connected to the first slide block oil inlet channels 74, and the other end of the first transfer channels 81 cooperates with the body oil inlet channel 23 of the film throttle 10 to be connected to an oil supply source (not shown in the figure). One end of the second transfer channels 82 is connected to the second slide block oil inlet channels 75, and the other end of the second transfer channels 82 is connected to the body oil outlet channels 25 of the film throttle 10 through a pipeline 83, respectively.

As shown in FIG. 11 , the throttle tube 90 has a head 91, a threaded body 92 connected to the head 91, an oil outlet passage 93 penetrating the head 91 and extending into the threaded body 92, and a throttle hole 94 disposed at the end of the threaded body 92 and axially connected to the oil outlet passage 93. The cross-sectional shape of the oil outlet passage 93 is designed to be countersunk to facilitate the locking of the throttle tube 90. In addition, the aperture D of the throttle hole 94 is between 0.1 mm and 0.3 mm. As shown in FIG. 9 , the throttling tubes 90 are threadedly arranged in the first transfer channels 81 and connected to the first slide block oil inlet channels 74 via the oil outlet channels 93. In addition, the throttling holes 94 provide a throttling effect on the hydraulic oil entering the first transfer channels 81, so that the throttling tubes 90 use the throttling holes 94 to first provide a throttling effect on the hydraulic oil and then use the oil outlet channels 93 to transport the hydraulic oil to the first slide block oil inlet channels 74.

It should be noted that, please refer to FIG. 12 , which mainly shows that when the slider 70 is subjected to loads of different sizes, the slider 70 will obtain different sizes of rigidity peak values due to the different aperture sizes of the throttle hole 94. Specifically, if the load F subjected to the slider 70 is in the compression direction (as shown in FIG. 13a ), the value of the load F is shown as a positive value in FIG. 12 , and if the load F subjected to the slider 70 is in the tension direction (as shown in FIG. 13b ), the value of the load F is shown as a negative value in FIG. 12 . Since the load F subjected to the slider 70 is mostly in the compression direction, the rigidity in the compression direction should be considered in FIG. 12 . As can be seen from FIG. 12 , when the aperture d is between 0.1 mm and 0.3 mm, the rigidity peak of the slider 70 appears in the compression direction, and when the aperture d is above 0.4 mm, the rigidity peak of the slider 70 appears in the tension direction. Therefore, the optimal range of the aperture d of the throttling hole 94 is between 0.1 mm and 0.3 mm.

In actual operation, a portion of the hydraulic oil provided by the oil supply source directly enters the first transfer channels 81 of the oil circuit adapter block 80, and enters the first slide block oil inlet channels 74 of the slide block 70 after being throttled by the throttle tubes 90, and finally reaches the two oil chambers 73 above the slide block 70. Another portion of the hydraulic oil enters the film throttle 10 and enters the oil circuit adapter block 80 through the pipelines 83 after being throttled by the gap G. The oil passes through the second transfer channels 82, then enters the second slide oil inlet channels 75 of the slide 70, and finally reaches the two oil chambers 73 below the slide 70. In this way, the lubricating oil can pass through the oil chambers 73 to form an oil film (not shown) between the first load surface 62 of the rail 60 and the second load surface 72 of the slide 70, so that the slide 70 can pass through the aforementioned oil film and smoothly make linear displacement along the rail 60 in a frictionless state. Once the slider 70 is under load, the oil chamber 73 under load will experience an increase in pressure due to the reduction in oil film thickness, which will cause the pressure in the throttling channel 264 to increase accordingly. The throttling channel 264 will lift up the diaphragm 40 after the pressure increases, and the gap G will change to adjust the throttling pressure to improve the load-bearing rigidity.

As can be seen from the above, the hydrostatic pressure device 50 of the present invention provides a diaphragm throttle 10 for use with the oil chambers 73 of the slider 70. Therefore, only one set of diaphragm throttles 10 is required instead of multiple sets as in the prior art, so as to achieve the purpose of saving costs and improving space utilization. In addition, by configuring the diaphragm throttle 10 in combination with the throttle tubes 90, the hydrostatic pressure device 50 of the present invention can achieve the effect of high rigidity performance.

10: diaphragm throttle 20: body 21: base 212: first screw hole 214: second screw hole 22: top cover 222: first countersunk hole 224: second countersunk hole S1: first countersunk screw S2: second countersunk screw 23: body oil inlet channel 232: oil inlet 24: body oil inlet groove 25: body oil outlet channel 252: oil outlet 26: throttling part 262: throttling surface 264: throttling channel 27: diaphragm support part 272: groove 28: lower pressure groove 29: flange 292: fixing hole 30: cover plate 31: top surface 32: bottom surface 33: oil guide hole 34: Perforation 35: Positioning part 36: Upper pressure groove 40: Diaphragm 42: Bottom surface G: Gap 50: Hydrostatic device 60: Track 61: First load part 62: First load surface 70: Slider 71: Second load part 72: Second load surface 73: Oil chamber 74: First slide oil inlet channel 75: Second slide oil inlet channel 76: Oil guide channel 80: Oil circuit adapter block 81: First adapter channel 82: Second adapter channel 90: Throttle tube 91: Head 92: Threaded body 93: Oil outlet channel 94: Throttle hole D: Diameter of throttle hole

FIG. 1 is a three-dimensional view of the diaphragm throttle of the present invention. FIG. 2 is a three-dimensional exploded view of the diaphragm throttle of the present invention. FIG. 3 is a top view of the base provided by the diaphragm throttle of the present invention, showing that the base has three grooves and a diaphragm is arranged therein. FIG. 4 is another top view of the base provided by the diaphragm throttle of the present invention, showing that the base has two grooves and a diaphragm is arranged therein. FIG. 5 is a transverse cross-sectional view of the diaphragm throttle of the present invention. FIG. 6 is a longitudinal cross-sectional view of the diaphragm throttle of the present invention. FIG. 7 is a partial enlarged view of part A in FIG. 6. FIG. 8 is a three-dimensional view of the hydrostatic pressure device of the present invention. FIG. 9 is a partial three-dimensional exploded view of the hydrostatic pressure device of the present invention. FIG. 10 is a combined cross-sectional view of the track and slider provided by the hydrostatic pressure device of the present invention. FIG. 11 is a cross-sectional view of the throttle tube provided by the hydrostatic pressure device of the present invention. FIG. 12 is a curve diagram of the hydrostatic pressure device of the present invention, showing that when the slider is subjected to loads of different sizes, the slider obtains different sizes of rigidity peaks due to the different aperture sizes of the throttle hole. FIG. 13a is an end view of the track and slider provided by the hydrostatic pressure device of the present invention, showing that the slider is subjected to a compressive load. FIG. 13b is similar to FIG. 13a, showing that the slider is subjected to a tensile load.

10: diaphragm throttle 21: base 212: first screw hole 214: second screw hole 22: top cover 222: first countersunk hole 224: second countersunk hole S1: first countersunk screw S2: second countersunk screw 232: oil inlet 24: body oil inlet groove 252: oil outlet 262: throttling surface 264: throttling channel 27: diaphragm support part 272: groove 28: lower pressure groove 29: flange 292: fixing hole 30: cover plate 31: top surface 32: bottom surface 33: oil guide hole 34: perforation 35: positioning part 36: upper pressure groove 40: diaphragm

Claims (7)

A diaphragm throttle comprises: a body having a body oil inlet passage, at least one body oil outlet passage, at least one throttling portion and at least one diaphragm supporting portion, the throttling portion having a throttling surface and a throttling passage, one end of the throttling passage passing through the throttling surface, and the other end of the throttling passage connected to the body oil outlet passage, the diaphragm supporting portion surrounding the throttling portion, and the diaphragm supporting portion having a plurality of grooves arranged at equal intervals relative to the throttling portion, the grooves connected to the body oil inlet passage and the body oil outlet passage; at least one cover plate arranged in the body; and at least one diaphragm arranged at the body Between the diaphragm supporting part and the cover plate, wherein the body further has at least one lower pressure groove; the lower pressure groove is located between the throttling part and the diaphragm supporting part and is connected to the body oil inlet channel and the grooves; the cover plate corresponds to the lower pressure groove and has an upper pressure groove connected to the body oil inlet channel, wherein the body further has a body oil inlet groove penetrating the diaphragm supporting part, and the body oil inlet channel is connected to the upper pressure groove and the lower pressure groove through the body oil inlet groove; the width of each groove is equal to the width of the body oil inlet groove, and the grooves and the body oil inlet groove are arranged at equal intervals relative to the throttling part. The diaphragm throttle as described in claim 1, wherein the cover plate has a top surface, a bottom surface and an oil guide hole, the oil guide hole penetrates the top surface and the bottom surface and connects the main body oil inlet groove and the upper pressure groove, the bottom surface of the cover plate has a positioning portion surrounding the upper pressure groove; the diaphragm is sandwiched between the diaphragm supporting portion of the main body and the positioning portion of the cover plate. The diaphragm throttle as described in claim 1, wherein there is a gap between a bottom surface of the diaphragm and the throttling surface of the throttling portion of the body, which connects the lower pressure groove and the throttling channel, and the gap is between 80μm-90μm. The diaphragm throttle as described in claim 1, wherein the body has two body oil outlet passages, two throttling parts, two diaphragm supporting parts and two lower pressure grooves, each throttling part has the throttling surface and the throttling passage, one end of each throttling passage penetrates one throttling surface, and the other end of each throttling passage is connected to one body oil outlet passage, each diaphragm supporting part surrounds one throttling part, and each diaphragm supporting part has a plurality of diaphragm supporting parts arranged at equal intervals relative to the throttling part. Grooves, each lower pressure groove is located between a throttling part and a diaphragm supporting part and is connected to an oil inlet channel of the body and the grooves; the film throttle includes two cover plates and two diaphragms, each cover plate is arranged in the body and corresponds to a lower pressure groove, each cover plate has an upper pressure groove connected to the oil inlet channel of the body, each diaphragm is arranged between an upper pressure groove and a lower pressure groove and is positioned between a diaphragm supporting part of the body and a cover plate. A hydrostatic device comprises: a hydrostatic linear slide having a track and a slide block slidably disposed on the track, the track having two first load surfaces disposed oppositely, the slide block having two second load surfaces disposed oppositely, the first load surfaces of the track corresponding to the second load surfaces of the slide block respectively, each of the second load surfaces of the slide block having an oil cavity, and the slide block having two slide block oil inlet channels, each of the slide block oil inlet channels being connected to one of the oil cavities; and a diaphragm throttle as described in claim 4, the diaphragm throttle connecting the slide block oil inlet channels of the slide block with the body oil outlet channels. The hydrostatic device as described in claim 5 further comprises an oil circuit transfer block and two throttle tubes, the oil circuit transfer block is arranged between the slide block and the film throttle, and the oil circuit transfer block has two first transfer channels and two second transfer channels, each throttle tube is arranged in one of the first transfer channels of the oil circuit transfer block; the track has four first load surfaces in pairs of two, the slide block has four second load surfaces in pairs of two, two first slide block oil inlet channels and two second slide block oil inlet channels, the first slide block oil inlet channels are connected to the throttle tubes, the second slide block oil inlet channels are connected to the second transfer channels of the oil circuit transfer block, and the second transfer channels of the oil circuit transfer block are connected to the main body oil outlet channels of the film throttle. The hydrostatic device as described in claim 6, wherein each throttling tube has an oil outlet channel and a throttling hole axially connected to the oil outlet channel, and the diameter of the throttling hole is between 0.1mm-0.3mm.

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