CN220320327U - Electronic flowmeter - Google Patents

Abstract

The utility model provides an electronic flowmeter. The electronic flowmeter comprises a valve body, a valve seat, a motor, a limiting mechanism and a sealing ring. The valve seat cavity and the ventilation cavity are communicated with each other. The valve seat is positioned in the valve seat cavity of the valve body and is in threaded connection with the cavity wall of the valve seat cavity. The motor is installed on the valve body, and the axle head and the disk seat top of motor can dismantle the connection to drive the disk seat and rotate the opening and shutting that controls the ventilation chamber. The limiting mechanism is arranged between the valve seat and the valve body to limit the rotation angle of the valve seat; the limiting mechanism comprises a protrusion and a baffle; the top outer wall surface of disk seat is provided with the protruding of horizontal extension, and the top of valve body is provided with the baffle that contacts with protruding. The sealing ring is arranged in the valve body to block gas communication between the valve seat cavity and the ventilation cavity. The utility model can not only cooperate with the motor to carry out zero adjustment, but also conveniently position the valve seat through the limiting mechanism.

Description

Electronic flowmeter

Technical Field

The utility model relates to a flowmeter, in particular to an electronic flowmeter.

Background

The flow rate of the gas is regulated by a float flowmeter, and the flow rate is regulated by manual regulation. For example, in the float flowmeter of the existing oxygenerator shown in fig. 1, the lower end is air-in, the upper end is air-out, and the valve needle is driven by the knob to control the communication size between the air-out end and the air-in end, so that the purpose of adjusting the flow is achieved.

Although the manually-adjusted float flowmeter can meet the effect of flow adjustment, the accuracy deviation of manual adjustment is large, and the flow adjustment and control is not accurate enough in the adjustment process; and manual regulation needs to leave the display tube that can look over the flow, and display tube and float flowmeter structure as an organic whole, and overall structure is bigger, and occupation space is big. For some small-sized oxygenerators or processing personnel who want to reduce the volume of the oxygenerator, the existing manually-adjusted float flowmeter is insufficient to meet the requirements of miniature size and high precision.

In order to overcome the problem of poor manual regulation precision, the knob can be replaced by the motor, the flow is regulated in a mechanical mode, the regulation precision is improved in the mode, meanwhile, the manual flow observation is not needed in the mechanical regulation, and the display tube can be replaced or the electronic element induction is adopted, so that the volume of the electronic flowmeter is reduced. Thus, mechanically regulated flowmeters are more capable of meeting today's usage needs. However, when the motor is used for adjustment, zero positions are inconsistent, namely, zero positions of the motor are inconsistent with zero positions of the flowmeter, so that when the motor is at the zero positions, the flowmeter is not at the zero positions, and when the flowmeter is theoretically closed, air leakage exists in fact. This has a great effect on the use of the flowmeter, even with more serious consequences.

Disclosure of Invention

Based on the above, it is necessary to provide an electronic flowmeter aiming at the problem that the theoretical zero position and the actual zero position of the existing electronic flowmeter are not uniform.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

an electronic flowmeter comprises a valve body, a valve seat, a motor, a limiting mechanism and a sealing ring.

The valve seat cavity and the ventilation cavity are communicated with each other.

The valve seat is positioned in the valve seat cavity of the valve body and is in threaded connection with the cavity wall of the valve seat cavity.

The motor is installed on the valve body, and the axle head and the disk seat top of motor can dismantle the connection to drive the disk seat and rotate the opening and shutting that controls the ventilation chamber.

The limiting mechanism is arranged between the valve seat and the valve body to limit the rotation angle of the valve seat; the limiting mechanism comprises a protrusion and a baffle; the top outer wall surface of disk seat is provided with the protruding of horizontal extension, and the top of valve body is provided with the baffle that contacts with protruding.

The sealing ring is arranged in the valve body to block gas communication between the valve seat cavity and the ventilation cavity.

Further, a plurality of clamping grooves are formed in the top of the valve body around the valve seat cavity, and the bottom ends of the baffles are clamped in the clamping grooves.

Further, a supporting plate is arranged between the adjacent clamping grooves, the supporting plate and the clamping grooves are arranged at intervals and are attached to each other, and one end of each clamping groove extends towards the central axis of the valve seat cavity and is located at the inner side of the supporting plate.

Further, the top of the valve body is provided with a limiting block, and the limiting block is positioned at the outer side of the supporting plate and leans against the end part of the clamping groove.

Further, the ventilation cavity comprises an air inlet cavity, an air outlet cavity and a communication cavity; the communication cavity is communicated with the air inlet cavity and the air outlet cavity and is communicated with the valve seat cavity.

Further, a valve needle is arranged on the valve seat, the head end of the valve needle is clamped on the valve seat, the tail end of the valve needle is gradually reduced in diameter and enters the air inlet cavity through the communication cavity, and the relative position between the tail end of the valve needle and the communication cavity is adjusted by motor driving so as to change the air flow in the valve body.

Further, the head end of the valve needle is in threaded connection with the valve seat.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the rotation angle of the valve seat is limited through the limiting mechanism, so that the valve seat can be matched with the motor to carry out zero adjustment, further the subsequent flow adjustment is convenient, meanwhile, the valve seat can be limited to carry out the whole circumferential rotation, and the valve seat can be conveniently positioned, thereby realizing the control of the valve seat rotation to control the opening and closing operation of the ventilation cavity;

2. according to the utility model, the sealing ring is arranged in the valve body, so that the tightness between the valve body and the valve seat can be improved, the leakage of air flow from the joint of the valve body and the valve seat is avoided, and the accuracy of air flow adjustment is further ensured.

Drawings

The disclosure of the present utility model is described with reference to the accompanying drawings. It should be understood that the drawings are for purposes of illustration only and are not intended to limit the scope of the present utility model in which like reference numerals are used to designate like parts. Wherein:

FIG. 1 is a schematic illustration of a prior art float flow meter;

FIG. 2 is a schematic view of an electronic flowmeter according to the present utility model;

FIG. 3 is a cross-sectional view from the perspective A-A of FIG. 2;

FIG. 4 is a schematic view of the internal structure of the valve body based on FIG. 2;

FIG. 5 is a schematic view of a valve seat based on FIG. 2;

FIG. 6 is a schematic view of the valve needle based on FIG. 2;

FIG. 7 is a schematic perspective view of a valve body based on FIG. 2;

FIG. 8 is a schematic view of a stop mechanism on the valve body based on FIG. 7;

fig. 9 is a cross-sectional view of an electronic flowmeter according to embodiment 2 of the present utility model.

The reference numerals in the drawings indicate: 1. a valve body; 11. an air inlet cavity; 12. a communication chamber; 13. an air outlet cavity; 14. a valve seat cavity; 2. a valve seat; 21. a protrusion; 3. a valve needle; 31. a first needle portion; 32. a second needle portion; 33. a third needle portion; 34. a limiting ring; 4. a seal ring; 5. a motor; 6. a baffle; 61. a support plate; 62. a limiting block; 63. a clamping groove.

Detailed Description

It is to be understood that, according to the technical solution of the present utility model, those skilled in the art may propose various alternative structural modes and implementation modes without changing the true spirit of the present utility model. Accordingly, the following detailed description and drawings are merely illustrative of the utility model and are not intended to be exhaustive or to limit the utility model to the precise form disclosed.

Example 1

Referring to fig. 2 and 3, the present embodiment describes an electronic flowmeter, which includes a valve body 1, a valve seat 2, a seal ring 4, a motor 5, and a limiting mechanism.

First, the structure of the valve body 1 will be described in detail. The valve seat cavity 14 and the ventilation cavity for the gas to flow in and out of the valve body 1 are sequentially arranged in the valve body 1 from top to bottom. The ventilation cavity is composed of a communicated air inlet cavity 11, an air outlet cavity 13 and a communication cavity 12, and the communication cavity 12 is communicated with the air inlet cavity 11 and the air outlet cavity 13. In fact, since the communication part between the air outlet cavity 13 and the air inlet cavity 11 is the communication cavity 12, and the valve seat cavity 14 is positioned at the top of the communication cavity 12, in order to facilitate the arrangement of the valve seat 2 in the valve seat cavity 14 to control the size of the communication cavity 12, the top end of the communication cavity 12 is communicated with the inner end of the air outlet cavity 13 through the bottom end of the valve seat cavity 14.

The structure of the valve seat chamber 14 shown in fig. 4 will be described as an example. The air inlet cavity 11, the communication cavity 12 and the valve seat cavity 14 are coaxially arranged, the air inlet cavity 11 and the air outlet cavity 13 are vertically arranged, and the air inlet cavity 11 and the air outlet cavity 13 are communicated through the communication cavity 12. In order to facilitate the adjustment of the flow rate by changing the size of the communication gap between the communication cavity 12 and the air outlet cavity 13, the diameter of the communication cavity 12 is generally smaller than that of the air inlet cavity 11 and the air outlet cavity 13, so as to facilitate the plugging operation along with the communication cavity 12. To facilitate connection of the flowmeter to other standard pipes, the diameter of the inlet chamber 11 provided on the valve body may be set to be the same as the diameter of the port of the outlet chamber 13. In addition, since the bottom end of the valve seat cavity 14 serves as the junction of the communication cavity 12 and the air outlet cavity 13, the internal dimension of the valve seat cavity is at least the same as that of the air outlet cavity 13 or larger than that of the air outlet cavity 13, and the internal space is laid out according to actual requirements.

However, the structure of the inside of the ventilation chamber is not limited to the above-mentioned layout, and other adjustments may be made as long as the valve seat chamber 14 is communicated with the communication chamber 12, and the size of the air flow flowing between the air inlet chamber 11 and the air outlet chamber 13 can be changed by changing the ventilation space inside the communication chamber 12.

Referring to fig. 3 and 5, the valve seat 2 is disposed in the valve seat cavity 14 and is screwed with the cavity wall of the valve seat cavity 14, so that the outer wall of the valve seat 2 and the inner wall of the valve seat cavity 14 are both provided with threads matched with each other, and the size of the threads is determined according to practical requirements. The top end of the valve seat 2 and the motor 5 can be connected in a transmission mode such as clamping, a coupling, gear transmission and the like. Taking a clamping connection as an example, in order to be convenient to connect with the shaft end of the motor 5, the top end of the valve seat 2 is provided with a deep hole I clamped with the shaft end of the motor 5. The deep hole one may or may not extend to the bottom end of the valve seat 2. For the convenience of the motor to drive the valve seat 2 to rotate, the first deep hole can adopt a non-circular structure, or a shaft key slot matched with the shaft end of the motor is arranged inside the first deep hole, so long as the motor can be satisfied to drive the valve seat 2 to rotate and the first deep hole and the second deep hole can not rotate relatively. The diameter at the top of disk seat 2 is greater than the diameter of well afterbody, therefore the screw thread can set up in the well afterbody surface of disk seat 2, and disk seat 2 overall shape is similar to T type along its radial visual angle, and disk seat chamber 14 matches with it, avoids disk seat 2 to rotate down in disk seat chamber 14 like this, is difficult for the problem of taking out disk seat 2 from the valves intracavity when having the trouble, also conveniently carries out other spacing operations, consequently disk seat 2 can constitute a whole by two upper and lower diameter variation in size's sleeve. An integrally formed valve seat 2 is generally employed.

Referring to fig. 3 and 6, the valve needle 3 engaged with the bottom end of the valve seat 2 is used for blocking the communication chamber 12. If the first deep hole penetrates through the whole valve seat 2, the valve needle 3 enters the first deep hole from the bottom end of the valve seat 2 and is clamped, and if the first deep hole does not penetrate through the valve seat 2, a hole which is clamped with the valve needle 3 is additionally formed in the bottom end of the valve seat 2 and is communicated with the first deep hole, so that the relative position between the valve needle 3 and the valve seat 2 can be conveniently adjusted subsequently. The valve seat 2 and the needle 3 are integrally formed because the valve seat 2 and the needle 3 are engaged and fixed. In addition, in order to adjust the relative position between the valve needle 3 and the valve seat 2, an external thread may be provided on the outer surface of the head end of the valve needle 3, and an internal thread may be provided on the inner wall of the tail end of the valve seat 2, so that the valve needle 3 can be engaged with the valve seat 2, but can still rotate, and the relative position between the valve seat 2 and the valve needle 3 is adjusted by the engagement of the external thread and the internal thread.

The bottom end of the valve needle 3 is matched to the communication chamber 12 and even enters the air intake chamber 11 through the communication chamber 12, so that the diameter of the bottom end of the valve needle 3 is minimized. The top of needle 3 needs to be with disk seat 2 bottom block, and the top size of needle 3 and the hole adaptation of disk seat 2 bottom. The valve needle 3 employed in the present embodiment includes a first needle portion 31, a second needle portion 32, and a third needle portion 33 that are disposed in this order from top to bottom. The top of the first needle portion 31 is in a frustum shape, and the diameter of the first needle portion 31 is gradually increased from top to bottom, so that the first needle portion 31 can conveniently enter the valve seat 2. The third needle portion 33 is tapered in diameter in the axial direction from the second needle portion 32, facilitating entry of the third needle portion 33 into the communication chamber 12. The second needle portion 32 connects the first needle portion 31 and the third needle portion 33, and the diameter of the second needle portion 32 is larger than that of the first needle portion 31 and the third needle portion 33, so that the valve needle 3 is prevented from completely entering the valve seat 2 or the communication cavity 12, and the limiting effect is achieved. An integrally formed valve needle 3 is typically employed. The shape of the valve needle 3 can be correspondingly adjusted according to the size change of the communication cavity 12 and the valve seat 2 in actual use.

According to the above description of the structure of the needle 3, it is preferable to provide the external thread on the outer surface of the first needle portion 31. In practice, in order to improve the tightness of the whole, i.e. to avoid the escape of gas from the gap between the valve body 1 and the valve seat 2, which would lead to inaccurate regulation, a sealing ring 4 is provided in the valve body 1. The valve needle 3 adopted in this embodiment reserves a position where the sealing ring 4 can be sleeved, for example, the sealing ring 4 is sleeved at the joint of the first needle portion 31 and the second needle portion 32, and since the diameter of the second needle portion 32 is large, the sealing ring 4 is blocked by the top end of the second needle portion 32 and stays there, the top of the sealing ring 4 is provided with the limiting ring 34, the limiting ring 34 is arranged at the top end of the first needle portion 31, the top end of the sealing ring 4 is limited, and the sealing ring 4 is limited on the valve needle 3 by being blocked by the limiting ring 34 and the second needle portion 32. The sealing ring 4 can also be installed on the second needle portion 32, and the installation position of the sealing ring 4 can be adjusted according to actual situations or actual requirements. Fig. 6 illustrates the placement of the seal ring on the second needle portion 32. The outer wall of the sealing ring 4 is contacted with the inner wall of the valve seat cavity 14 to seal the gap between the valve seat 2 and the valve seat cavity 14, so that the air flow in the ventilation cavity can be prevented from being discharged out of the valve body 1 through the valve seat cavity 14, the tightness is improved, and the possibility of air leakage is reduced.

Referring to fig. 2 and 3, the motor 5 is detachably mounted on the valve body 1, for example, by bolts. The shaft end of the motor 5 enters into the deep hole I of the valve seat 2 and is clamped, the motor 5 drives the valve seat 2 to rotate, the relative position of the valve seat 2 rotating in the valve body 1 is changed, the length of the valve needle 3 positioned in the communication cavity 12 is changed, the plugging space of the communication cavity 12 is changed, and the purpose of adjusting flow is achieved.

In fact, when the motor 5 is clamped with the valve seat 2, the zero position of the valve seat 2 and the zero position of the motor 5 may not be the same point, and the valve seat 2 is not easy to position due to deviation after the valve seat 2 rotates, so that a limiting mechanism needs to be arranged between the valve seat 2 and the valve body 1 to position the valve seat 2 and facilitate zero adjustment of the motor 5.

With reference to fig. 5 and 8, the limiting mechanism is mainly composed of a protrusion 21 and a baffle 6. The top outer wall surface of the valve seat 2 is provided with a laterally extending projection 21, and the top of the valve body 1 is provided with a baffle 6 in contact with the projection 21. The boss 21 is integrally connected with the valve seat 2 so that the boss 21 rotates together with the valve seat 2. The baffle 6 can be clamped on the valve body 1, a plurality of clamping grooves 63 are formed in the top of the valve body 1 around the valve seat cavity 14, and the bottom end of the baffle 6 is clamped in the clamping grooves 63. In order to improve the stability of the engagement between the baffle 6 and the clamping groove 63, a support plate 61 is provided between adjacent clamping grooves 63, and the support plate 61 and the clamping groove 63 are arranged at intervals and are attached to each other, so that two sides of the baffle 6 positioned in the clamping groove 63 can be contacted with the support plate 61, and the stability of the baffle 6 is improved. Since one end of the clamping groove 63 extends toward the central axis of the valve seat cavity 14 and is located at the inner side of the supporting plate 61, the part of the baffle 6 clamped with the clamping groove 63 is also located at the inner side of the supporting plate 61, the supporting plate 61 is integrally enclosed into a ring-like shape, the top end size of the valve seat 2 is smaller than the ring enclosed by the supporting plate 61, the supporting plate 61 does not block the rotation of the valve seat 2, but the baffle 6 extends inwards and can contact with the boss 21, and the cooperation of the boss 21 and the baffle 6 can limit the rotation of the valve seat 2.

Although the bottom end of the baffle 6 is clamped in the clamping groove 63, the middle upper section of the baffle 6 is still located outside the clamping groove 63, and two sides of the baffle 6 are supported by the support plates 61, but one side of the baffle 6 away from the protrusion 21 is not shielded, and when the baffle 6 is extruded or pushed, the baffle 6 may be separated along the length direction of the clamping groove 63. In order to avoid this, a stopper 62 is provided at one end of the clamping groove 63 located outside the support plate 61, the stopper 62 is fixed at the top of the valve body 1 and contacts with one side of the baffle 6 away from the protrusion 21, and the stability of the baffle 6 is further improved by the cooperation of the support plate 61 and the stopper 62.

Because the clamping grooves 63 are formed, the valve seat 2 can be adjusted to the zero state firstly, at the moment, the baffle plate 6 can be arranged in the clamping groove 63 nearest to the bulge 21, and the valve seat 2 is in the zero state and cannot rotate in the forward direction to the baffle plate 6, and the baffle plate 6 can intercept the reverse rotation when the baffle plate 6 is rotated, so that the valve seat 2 is blocked due to the blocking of the forward and reverse movement of the baffle plate 6, and the valve seat 2 is conveniently positioned. The valve seat 2 is in a zero position state and is clamped with the shaft end of the motor 5, so that zero position of the motor 5 is unified with zero position of the valve seat 2, the motor 5 reversely rotates to a position where the baffle 6 contacts with the bulge 21 to be a stop position, at the moment, the motor 5 can drive the valve seat 2 to rotate between the zero position and the stop position, the position of the valve needle 3 in the communication cavity 12 is changed, the air flow is influenced by blocking of the valve needle 3 to change, and the purpose of adjusting flow is achieved. In addition, for the convenience to install electronic flowmeter and other devices, set up the mounting hole one along disk seat chamber 14 axis direction at the top of valve body 1 and be located the backup pad 61 outside, set up the mounting hole two along disk seat chamber 14 radial direction in valve body 1 middle section, the axis of mounting hole one is perpendicular with the axis of mounting hole two, can satisfy the installation of electronic flowmeter in different directions fixedly.

Based on this, the electronic flowmeter that this embodiment introduced can provide more accurate flow regulation, and separates the display tube, makes electronic flowmeter can be better hide, and the convenience is built-in with electronic flowmeter, does not influence the outward appearance, and display part can be with other parts sharing display screen, reduces the occupation of space, satisfies miniature design's demand.

Example 2

As shown in fig. 9, this embodiment describes an electronic flowmeter that is substantially the same in structure as the electronic flowmeter described in embodiment 1. The difference is that the valve needle 3 is composed of an upper branch section and a lower branch section, and a sealing ring is arranged on a valve seat. The diameter of the upper branch section is larger than that of the lower branch section, the upper branch section is all positioned inside the bottom end of the valve seat 2, the lower branch section extends outwards from the bottom end of the valve seat 2, and the diameter of the lower branch section is gradually reduced from top to bottom. The outer surface of the upper branch section is provided with external threads correspondingly connected with the inner cavity at the bottom end of the valve seat, and the external threads are matched with the internal threads of the inner cavity at the bottom end of the valve seat 2 to adjust the relative position between the valve needle 3 and the valve seat 2 so as to seal the communication cavity 12.

An annular groove is arranged on the outer surface of the valve seat 2 and is used for accommodating the sealing ring 4, and the outer peripheral wall of the sealing ring 4 is attached to the valve seat cavity 14 inside the valve body. It should be noted that the annular recess is located below the threaded connection of the valve seat 2 with the valve body 1. The present embodiment changes the structure of the valve needle 3 without disposing the seal ring 4 on the valve needle 3, but disposing the seal ring 4 on the valve seat 2, which complicates the valve seat 2, but can reduce the resistance that the valve needle 3 receives, and transfer the resistance to the valve seat 2 so as to maintain relative stability between the valve seat 2 and the valve needle 3.

This embodiment can also provide more accurate flow rate adjustment than embodiment 1, and can maintain the relative stability between the needle 3 and the valve seat 2 so that the valve seat blocks the communication chamber.

The technical scope of the present utility model is not limited to the above description, and those skilled in the art may make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present utility model, and these changes and modifications should be included in the scope of the present utility model.

Claims (7)

1. An electronic flowmeter, comprising:

the valve body (1) is internally provided with a valve seat cavity (14) and a ventilation cavity for gas to flow in and out in the valve body (1) from top to bottom in sequence, and the valve seat cavity (14) and the ventilation cavity are communicated with each other;

the valve seat (2) is positioned in the valve seat cavity (14) of the valve body (1) and is in threaded connection with the cavity wall of the valve seat cavity (14);

the motor (5) is arranged on the valve body (1), and the shaft end of the motor (5) is detachably connected with the top end of the valve seat (2) to drive the valve seat (2) to rotate so as to control the opening and closing of the ventilation cavity;

the limiting mechanism is arranged between the valve seat (2) and the valve body (1) to limit the rotation angle of the valve seat (2); the limiting mechanism comprises a bulge (21) and a baffle (6); the outer wall surface of the top of the valve seat (2) is provided with a bulge (21) which transversely extends, and the top of the valve body (1) is provided with a baffle plate (6) which is contacted with the bulge (21);

and a sealing ring (4) arranged in the valve body (1) to block the gas communication between the valve seat cavity (14) and the ventilation cavity.

2. The electronic flowmeter of claim 1, wherein a plurality of clamping grooves (63) are formed in the top of the valve body (1) around the valve seat cavity (14), and the bottom ends of the baffles (6) are clamped in the clamping grooves (63).

3. The electronic flowmeter of claim 2, wherein a support plate (61) is provided between adjacent clamping grooves (63), the support plate (61) and the clamping grooves (63) are arranged at intervals and are attached to each other, and one end of the clamping groove (63) extends toward the central axis of the valve seat cavity (14) and is positioned on the inner side of the support plate (61).

4. An electronic flowmeter according to claim 3, characterized in that a stopper (62) is provided at the top of the valve body (1), the stopper (62) being located outside the support plate (61) and being located against the end of the clamping groove (63).

5. The electronic flowmeter of claim 1, wherein the vent lumen comprises an inlet lumen (11), an outlet lumen (13), and a communication lumen (12); the communication cavity (12) is communicated with the air inlet cavity (11) and the air outlet cavity (13) and is communicated with the valve seat cavity (14).

6. The electronic flowmeter of claim 5, wherein the valve seat (2) is provided with a valve needle (3), the head end of the valve needle (3) is clamped on the valve seat (2), the tail end diameter of the valve needle is gradually reduced and enters the air inlet cavity (11) through the communication cavity (12), and the relative position of the tail end of the valve needle (3) and the communication cavity (12) is driven and adjusted by the motor (5) so as to change the air flow in the valve body (1).

7. An electronic flowmeter according to claim 1, characterized in that the head end of the valve needle (3) is screwed with the valve seat (2).