CN203024924U - Pressure difference signal sensor with dynamic sealing structure - Google Patents

Abstract

A pressure difference signal sensor with a dynamic sealing structure belongs to the field of oil pressure difference measurement. The utility model aims to solve the problem that the existing differential pressure signal sensor cannot discharge the gas in the oil pipeline, which makes the measurement inaccurate. It includes a base, a lower diaphragm, a lower case, an upper case, a plunger, a displacement transmission column and a signal output module. A groove is arranged in the middle of the upper end of the base, and the lower diaphragm is fixedly connected to the upper end of the groove. The lower case Set on the outside of the lower diaphragm, the lower end of the lower housing is fixedly connected to the upper end of the base, the plunger is fixedly set in the lower through hole, the displacement transmission column is set in the plunger, and the lower end of the displacement transmission column is attached to the upper surface of the lower diaphragm , the upper end of the displacement transmission column is provided with a signal output module, the bottom of the groove on the base has a first through hole, and the inner wall of the cavity formed by the lower diaphragm, the base and the lower housing is also opened to the outside of the sensor. the second through hole. The utility model is used for measuring the oil pressure difference in the oil pressure pipe.

Description

A differential pressure signal sensor with dynamic sealing structure

technical field

The utility model relates to a pressure difference signal sensor with a dynamic sealing structure, which belongs to the field of oil pressure difference measurement.

Background technique

At present, there are mainly two types of differential pressure signal sensors for measuring the oil pressure difference in the oil pipe. One is to use the bellows as the pressure sensing element. The displacement signal proportional to the pressure difference; the other is to use the bellows as the pressure sensing element. However, neither of the two methods can discharge the gas in the oil pipe, and the gas in the oil pipe will affect the measurement of the oil pressure difference, making the measured pressure difference inaccurate.

Utility model content

The utility model solves the problem that the existing differential pressure signal sensor cannot discharge the gas in the oil pipeline, which makes the measurement inaccurate.

In order to solve the above technical problems, a differential pressure signal sensor with a dynamic sealing structure is provided, the sensor includes a base, a lower diaphragm, a lower housing, an upper housing, a plunger, a displacement transmission column and a signal output module, the upper end of the base There is a groove in the middle position, and the lower diaphragm is fixedly connected to the upper end of the groove and sealed between the two. The lower casing is a cover-shaped structure with a lower through hole on the top, and the lower casing is arranged on the outside of the lower diaphragm. The lower end of the body is fixedly connected to the upper end of the base and the connection between the two is sealed. The plunger is fixedly set in the lower through hole and sealed between the plunger and the lower housing. The displacement transmission column is slidably set in the plunger. The displacement transmission column and the column The fit gap of the plug is less than 5 μm, the lower end of the displacement transmission column is attached to the upper surface of the lower diaphragm, the upper end of the displacement transmission column is provided with a signal output module, and the bottom of the groove on the base has a first through hole, the lower diaphragm, the base A second through hole penetrating to the outside of the sensor is also opened on the inner wall of the cavity formed by the lower casing.

Compared with the prior art, the utility model has the following beneficial effects: the matching gap between the displacement transmission column and the plunger described in the utility model is less than 5 μm (the diameter of the oil molecule is 5 μm), and the upper cavity of the lower diaphragm passes through the second channel The hole is filled with low-pressure oil, and the cavity at the lower end of the lower diaphragm is filled with high-pressure oil through the first through hole, so that the cavity where the low-pressure oil is located can transfer the gas in the cavity where the low-pressure oil is located through the gap between the displacement transmission column and the plunger. Drain and ensure that the oil in the cavity does not flow out, realize dynamic sealing, and make the measured oil pressure difference more accurate.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1 . A differential pressure signal sensor with a dynamic sealing structure described in this embodiment includes a base 1 , a lower diaphragm 2 , a lower housing 4 , and an upper housing. 5. The plunger 10, the displacement transmission column 11 and the signal output module 13, a groove 1-1 is provided in the middle of the upper end of the base 1, the lower diaphragm 2 is fixedly connected to the upper end of the groove 1-1 and the connection between the two is sealed , the lower casing 4 is a cover-shaped structure with a lower through hole 4-1 on the top, the lower casing 4 is arranged on the outside of the lower diaphragm 2, the lower end of the lower casing 4 is fixedly connected to the upper end of the base 1 and the two are sealed , the plunger 10 is fixedly set in the lower through hole 4-1 and the seal between the plunger 10 and the lower housing 4 is sealed, the displacement transmission column 11 is slidably set in the plunger 10, and the matching gap between the displacement transmission column 11 and the plunger 10 is less than 5 μm (oil molecule diameter is 5 μm), the lower end of the displacement transmission column 11 is attached to the upper surface of the lower diaphragm 2, the upper end of the displacement transmission column 11 is provided with a signal output module 13, and the bottom of the groove 1-1 on the base 1 is opened with The first through hole 14, the inner wall of the cavity formed by the lower diaphragm 2, the base 1 and the lower casing 4 is also provided with a second through hole 15 penetrating to the outside of the sensor.

Specific Embodiment 2: This embodiment is described with reference to FIG. 1 . In this embodiment, a flange 10-1 is also provided on the outer wall of the plunger 10 along the circumferential direction, and the plunger 10 and the flange 10-1 are integrally structured. The plunger 10 is flange-connected to the upper end surface of the lower casing 4 through screws 16, so that the connection between the plunger 10 and the lower casing 4 is more stable, and other components and connections are the same as those in the first embodiment.

Specific Embodiment 3: This embodiment is described in conjunction with FIG. 1. A sealing ring 17 is also provided along the circumferential direction between the flange 10-1 and the upper end surface of the lower housing 4 in this embodiment. The sealing effect of the cavity at the lower end of the housing 4 is better, and the other components and connections are the same as those in the second embodiment.

Embodiment 4: This embodiment is described in conjunction with FIG. 1. The sensor in this embodiment also includes a lower plunger nut 8, which is mushroom-shaped, and the lower end of the displacement transmission column 11 is a threaded rod. The head of the nut 8 is set downwards, the upper end of the lower plunger nut 8 is threadedly connected with the lower end of the displacement transmission column 11, and the mushroom-shaped head of the lower plunger nut 8 is fixedly connected with the lower diaphragm 2, so that the lower diaphragm is enlarged. The contact area between the sheet 2 and the displacement transmission column 11 makes the lower diaphragm 2 not easily damaged when transmitting the displacement, and the other components and connections are the same as those in the first embodiment.

Embodiment 5: This embodiment is described in conjunction with FIG. 1. The sensor in this embodiment also includes a lower gland 3, the lower gland 3 is fixedly connected to the upper end of the groove edge of the groove 1-1 with the opening facing downward, and the lower diaphragm 2 Sandwiched between the lower gland 3 and the base 1, the middle position of the upper end of the lower gland 3 has a lower gland through hole, and the displacement transmission column 11 passes through the lower gland through hole, so that the lower diaphragm 2 is more stable And the sealing performance is better, and the other components and connections are the same as those in the first embodiment.

Specific Embodiment Six: This embodiment is described in conjunction with FIG. 1. According to this embodiment: an adjusting nut 18 is also provided between the displacement transmission column 11 and the through hole of the lower gland, and an internal thread is provided on the through hole of the lower gland. The nut 18 is provided with an external thread, and the through hole of the lower gland is threadedly connected with the adjusting nut 18. The lower end of the displacement transmission column 11 is worn on the adjustment nut 18 and the two are slidably arranged. This arrangement can make the displacement transmission column 11 more effective. Positioning, other composition and connection relations are the same as those in Embodiment 4 or 5.

Embodiment 7: This embodiment is described in conjunction with FIG. 1. According to this embodiment: the upper end of the displacement transmission column 11 is a threaded rod structure with external threads, the upper plunger nut 9 is mushroom-shaped, and the upper plunger nut The head of 9 is arranged upwards, the lower end of the upper plunger nut 9 is threadedly connected with the upper end of the displacement transmission column 11, and the upper end of the upper gland 7 is fixedly connected with an upper casing 5, which is cylindrical, and the upper casing The upper diaphragm 6 is also fixedly connected between the body 5 and the upper gland 7, the upper end of the upper plunger nut 9 is attached to the lower surface of the upper diaphragm 6, and the upper gland 7 is provided with an upper gland opening in the middle position. hole, the floating contact 12 passes through the upper gland through hole of the upper gland 7 and the lower end of the floating contact 12 sticks on the upper surface of the upper diaphragm 6, so that the concentrated pressure transmitted by the displacement transmission column 11 The upper plunger nut 9 and the upper diaphragm 6 are converted into uniform pressure, which makes the stress distribution more reasonable and improves the overload resistance and stability of the product. At the same time, increasing the upper plunger nut 9 can also increase the upper diaphragm 6 The force-bearing area, prolonging the service life, other composition and connection relations are the same as the specific embodiment one.

Embodiment 8: This embodiment is described in conjunction with FIG. 1. As described in this embodiment: the sensor also includes a casing 19, the fixed cover of the casing 19 is mounted on the upper end of the upper casing 5, and the signal output module 13 is fixedly connected to the Inside the case 19, a limit module 20 is also arranged between the signal output module 13 and the floating contact 12, the limit module 20 is fixedly connected to the inner wall of the case 19, and is connected to the upper end of the floating contact 12 on the limit module 20. The corresponding position is also provided with a limiting through hole 20-1, the limiting through hole 20-1 is tapered, the upper end of the floating contact 12 is also tapered and the inner wall of the limiting through hole 20-1 is in contact with the floating contact 12. The inclination angles of the upper side walls are the same, the upper end of the floating contact 12 is set in the limit through hole 20-1, and the module contact 13-1 at the lower end of the signal output module 13 is set in the limit through hole 20-1, The vertical distance between the tapered side wall of the upper end of the floating contact 12 and the tapered inner wall of the limiting through hole 20-1 minus the distance between the upper end of the floating contact 12 and the module contact 13-1 is less than 0.5 mm, such setting limits the floating range of the floating contact 12 and prevents the signal output module 13 from being damaged. Other components and connections are the same as those in the first embodiment.

Specific embodiment nine: This embodiment is described in conjunction with FIG. 1. According to this embodiment: the sensor also includes a first interface, a screw tube 21, a second interface screw tube 22, a first interface nut 23 and a second interface nut 24 , the upper end of the first interface coil 21 is fixedly connected to the lower end of the base 1 and penetrates through the first through hole 14, the first interface nut 23 is threadedly connected to the lower end of the first interface coil 21, and the second through hole 15 penetrates through The base 1, the upper end of the second interface coil 22 is fixedly connected to the lower end of the base 1 and communicates with the second through hole 15, and the second interface nut 24 is threadedly connected to the lower end of the second interface coil 22, so that the first The connection between the through hole 14 and the second through hole 15 and the low-pressure oil pipe and the high-pressure oil pipe is more convenient, and other components and connections are the same as those in the first embodiment.

working principle:

When in use, the first interface nut 23 is threaded with the high-pressure oil pipe, and the second interface nut 24 is threaded with the low-pressure oil pipe, so that the upper cavity of the lower diaphragm 2 is filled with low-pressure oil, and the lower cavity of the lower diaphragm 2 is filled with oil. When the high-pressure oil is injected, the lower diaphragm 2 is displaced upward due to the oil pressure difference between the upper and lower ends of the cavity, and the lower diaphragm 2 transmits the displacement to the upper diaphragm 6 through the displacement transmission column 11, and then the upper diaphragm 6 transfers the displacement to the upper diaphragm 6. The module contact 13-1 transmitted to the signal output module 13 through the floating contact 12, while realizing the output of the oil pressure differential signal, because the matching gap between the displacement transmission column 11 and the plunger 10 is less than 5 μm (the diameter of the oil molecule is 5 μm) , the cavity where the low-pressure oil is located can discharge the gas in the cavity where the low-pressure oil is located through the gap between the displacement transmission column 11 and the plunger 10 and ensure that the oil does not flow out, thereby realizing dynamic sealing and making the measured oil pressure difference more accurate .

Claims (9)

1. pressure difference signal sensor with dynamic seal structure, it is characterized in that: described sensor comprises base (1), lower diaphragm (2), lower house (4), upper shell (5), plunger (10), displacement transfer column (11) and signal output module (13), the centre position of base (1) upper end is provided with groove (1-1), lower diaphragm (2) be fixedly connected on the upper end of groove (1-1) and both between the sealing, lower house (4) has the lid-like of lower through-hole (4-1) for the top, lower house (4) is arranged on the outside of lower diaphragm (2), the lower end of lower house (4) is fixedly connected on the upper end of base (1) and both junction sealings, plunger (10) is fixedly set in lower through-hole (4-1) and sealing between plunger (10) and lower house (4), displacement transfer column (11) slip cap is contained in plunger (10), the tolerance clearance of displacement transfer column (11) and plunger (10) is less than 5 μ m, the lower end of displacement transfer column (11) is attached on the upper surface of lower diaphragm (2), the upper end of displacement transfer column (11) is provided with signal output module (13), the bottom of base (1) upper groove (1-1) has the first through hole (14), lower diaphragm (2), base (1) and lower house (4) form on the inwall of cavity and also have the second through hole (15) that penetrates into described sensor outside.

2. a kind of pressure difference signal sensor with dynamic seal structure according to claim 1, it is characterized in that: along the circumferential direction also be provided with ring flange (10-1) on the outer wall of described plunger (10), plunger (10) is structure as a whole with ring flange (10-1), and plunger (10) is connected with the upper surface flange of lower house (4) by screw (16).

3. a kind of pressure difference signal sensor with dynamic seal structure according to claim 2, is characterized in that: also be provided with O-ring seal (17) along circumferencial direction between the upper surface of described ring flange (10-1) and lower house (4).

4. a kind of pressure difference signal sensor with dynamic seal structure according to claim 1, it is characterized in that: described sensor also includes lower plunger nut (8), lower plunger nut (8) is mushroom-shaped, the lower end of displacement transfer column (11) is threaded rod, lower plunger nut (8) head arranges down, the upper end of lower plunger nut (8) is threaded with the lower end of displacement transfer column (11), and the mushroom-shaped head of lower plunger nut (8) is fixedly connected with lower diaphragm (2).

5. a kind of pressure difference signal sensor with dynamic seal structure according to claim 1, it is characterized in that: described sensor also includes lower cover (3), the opening down groove edge upper end that is fixedly connected on groove (1-1) of lower cover (3), lower diaphragm (2) is clipped between lower cover (3) and base (1), the centre position of lower cover (3) upper end has the lower cover through hole, and displacement transfer column (11) is through on the lower cover through hole.

6. according to claim 4 or 5 described a kind of pressure difference signal sensors with dynamic seal structure, it is characterized in that: also be provided with setting nut (18) between displacement transfer column (11) and lower cover through hole, be provided with internal thread on the lower cover through hole, setting nut (18) is provided with external thread, the lower cover through hole is threaded with setting nut (18), and the lower end of displacement transfer column (11) is through setting nut (18) upward and slides both and arranges.

7. a kind of pressure difference signal sensor with dynamic seal structure according to claim 1, it is characterized in that: the upper end of described displacement transfer column (11) is with externally threaded threaded rod structure, upper plug nut (9) is mushroom-shaped, the head of upper plug nut (9) arranges up, the lower end of upper plug nut (9) is threaded with the upper end of displacement transfer column (11), the upper end of lower house (4) is fixedly connected with upper shell (5), the upper end of upper shell (5) is fixedly connected with upper press cover (7), upper shell (5) is tubular, also be fixedly connected with upper diaphragm (6) between upper shell (5) and upper press cover (7), the upper end of upper plug nut (9) is attached on the lower surface of upper diaphragm (6), the centre position of upper press cover (7) also has the upper press cover through hole, floating contact (12) is through on the upper press cover through hole of upper press cover (7) and the lower end of floating contact (12) is attached on the upper surface of upper diaphragm (6).

8. a kind of pressure difference signal sensor with dynamic seal structure according to claim 1, it is characterized in that: described sensor also includes case (19), case (19) fixed cap is contained in the upper end of upper shell (5), signal output module (13) is fixedly connected in case (19), also be provided with spacing module (20) between signal output module (13) and floating contact (12), spacing module (20) is fixedly connected with the inwall of case (19), also be provided with limiting through hole (20-1) in spacing module (20) the upper position corresponding with floating contact (12) upper end, (20-1) is tapered for limiting through hole, the upper end of described floating contact (12) is also identical with the angle of inclination of floating contact (12) upper end sidewall for taper and limiting through hole (20-1) inwall, the upper end of floating contact (12) is arranged in limiting through hole (20-1), the module contacts (13-1) of described signal output module (13) lower end is arranged in limiting through hole (20-1), vertical distance between the tapered sidewalls of floating contact (12) upper end and the conical inboard wall of limiting through hole (20-1) deducts the upper end of floating contact (12) and the distance between module contacts (13-1) less than 0.5mm.

9. a kind of pressure difference signal sensor with dynamic seal structure according to claim 1, it is characterized in that: described sensor also comprises first interface screwed pipe (21), the second interface screwed pipe (22), first interface nut (23) and the second joint nut (24), the upper end of first interface screwed pipe (21) is fixedly connected on the lower end of base (1) and connects with the first through hole (14), first interface nut (23) is threaded in the lower end of first interface screwed pipe (21), described the second through hole (15) connects base (1), the upper end of the second interface screwed pipe (22) is fixedly connected on the lower end of base (1) and connects with the second through hole (15), the second joint nut (24) is threaded in the lower end of the second interface screwed pipe (22).

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