Rotary multi-position reversing valve for diaphragm metering pump

Abstract

The utility model discloses a rotary multi-position reversing valve for a diaphragm metering pump, and belongs to the technical field of valves. According to the rotary type multi-position reversing valve for the diaphragm metering pump, a conventional mechanical air distribution valve is changed into a rotary type U-shaped channel opening, and the rotary type multi-position reversing valve is used in cooperation with a servo motor, so that the flow of the diaphragm metering pump can be adjusted more accurately; the problem that the service life of a diaphragm of a traditional electric double-diaphragm metering pump is short due to the driving force problem is solved, the diaphragm is driven through gas / liquid, the stress of the diaphragm is uniform, and the service life is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a rotary multi-position reversing valve for diaphragm metering pump. BACKGROUND

[0002] The valve used by the current electric double diaphragm metering pump is a pneumatic pilot valve. This valve mainly relies on the pressure of the control driving gas to adjust the delivery capacity of the electric double diaphragm metering pump during operation. However, this adjustment method has certain limitations, mainly reflected in the following aspects:

[0003] Firstly, the pneumatic pilot valve can only be roughly adjusted by changing the pressure of the driving gas, and cannot realize intelligent control of the electric double diaphragm metering pump. In modern industrial production, the accuracy and stability of fluid delivery are increasingly required, while the traditional pneumatic pilot valve cannot meet these high standards. The lack of intelligent control system makes the diaphragm metering pump not capable of dealing with complex and changeable process conditions.

[0004] Secondly, due to the limited adjustment accuracy of the pneumatic pilot valve, it cannot realize precise adjustment of the flow of the diaphragm metering pump. Precise control of flow is crucial for many process operations, for example, in the chemical, pharmaceutical and food industries, small changes in flow can affect the quality and yield of the final product. Therefore, the pneumatic pilot valve lacking precise flow adjustment capability limits the application of diaphragm metering pumps in these fields to some extent.

[0005] In summary, the current pneumatic pilot valve has obvious shortcomings in intelligent control and precise flow adjustment. In order to improve the performance of the diaphragm metering pump and meet the needs of modern industry, it is necessary to upgrade or replace the valve to realize intelligent and precise operation of the diaphragm metering pump. UTILITY MODEL CONTENTS

[0006] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a rotary multi-position reversing valve for diaphragm metering pump, which can more accurately adjust the flow of the diaphragm metering pump, solve the problem of low service life of the diaphragm of the traditional electric double diaphragm metering pump caused by driving force, and the gas / liquid driven diaphragm is uniformly stressed and has greatly prolonged service life.

[0007] The technical solution of the utility model is:

[0008] The utility model provides a rotary multi-position reversing valve for diaphragm metering pump, including the casing, rotationally connected with the rotary shaft in the casing, the rotary shaft is driven rotationally by servo motor, the upper portion of casing is sequentially arranged with the air inlet one, A cavity drive port and A cavity exhaust port, the lower portion of casing is sequentially arranged with the air inlet two, B cavity drive port and B cavity exhaust port, wherein A cavity drive port and B cavity drive port are connected with the A cavity drive port and B cavity drive port of diaphragm metering pump through pipeline respectively, rotary shaft is provided with opening no.

[0009] Preferably, the rotary shaft is provided with a sealing sleeve corresponding to the opening no.

[0010] Preferably, the rotary shaft is rotationally connected in the casing through a bearing.

[0011] Preferably, the servo motor is electrically connected with a controller.

[0012] Preferably, the controller is provided with a display screen.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The rotary multi-position reversing valve for diaphragm metering pump of the utility model controls the rotating speed of the rotary shaft through the servo motor, so as to minimize the time interval of the reciprocating drive of the diaphragm of the diaphragm metering pump, can more accurately adjust the flow of the diaphragm metering pump, solves the problem that the adjustment accuracy of the pneumatic guide valve is limited and cannot realize the accurate adjustment of the flow of the diaphragm metering pump. Meanwhile, the utility model also solves the problem of low service life of the diaphragm caused by the driving force of the traditional electric double diaphragm metering pump, and the diaphragm is driven by gas / liquid, and the diaphragm is uniformly stressed and has greatly prolonged service life.

[0015] 2. The rotary multi-position reversing valve for diaphragm metering pump of the utility model changes the conventional mechanical type gas distribution valve into the form of rotary U-shaped channel port, and is used in combination with servo control, can accurately control the conduction speed of each channel, and can be accurately positioned.

[0016] 3. The rotatory multi-position reversing valve for diaphragm metering pump of the utility model can be used for compressed gas or liquid, and is more energy-saving and convenient when using liquid under pressure as medium to drive the diaphragm metering pump than compressed gas, and tap water can be used as power to drive the diaphragm metering pump at low pressure. In addition, the rotatory multi-position reversing valve for diaphragm metering pump of the utility model breaks through the limitation of the valve port diameter of the traditional diaphragm metering pump, and the channel port diameter can be processed. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the exploded view of the rotatory multi-position reversing valve for diaphragm metering pump of the utility model.

[0018] Figure 2 is the connection schematic view of the rotatory multi-position reversing valve for diaphragm metering pump and the diaphragm metering pump of the utility model.

[0019] Figure 3 is the state schematic view of the rotatory multi-position reversing valve for diaphragm metering pump when the A cavity is expanded and the B cavity is compressed in the utility model.

[0020] In the figure, 1, shell; 101, gas / liquid inlet one; 102, A cavity driving port; 103, A cavity gas / liquid outlet; 104, gas / liquid inlet two; 105, B cavity driving port; 106, B cavity gas / liquid outlet; 2, rotating shaft; 201, opening one; 202, opening two; 203, channel one; 204, opening three; 205, opening four; 206, channel two; 3, diaphragm metering pump; 301, A cavity; 302, B cavity; 303, diaphragm; 4, sealing sleeve; 401, opening; 5, bearing; 6, servo motor; 7, controller; 701, display screen. DETAILED DESCRIPTION

[0021] In order to make the person in the art better understand the technical scheme in the application, the technical scheme of the application will be described clearly and completely in combination with the embodiments of the application.

[0022] Embodiment 1

[0023] As Figures 1-2As shown, the embodiment provides a rotary multi-position reversing valve for diaphragm metering pump, which comprises a shell 1, a rotating shaft 2 is rotatably connected in the shell 1 through a bearing 5, the rotating shaft 2 is driven to rotate by a servo motor 6, the servo motor 6 is electrically connected with a controller 7, and a display screen 701 is arranged on the controller 7. The upper part of the shell 1 is sequentially and spacedly provided with an air / liquid inlet one 101, an A cavity driving port 102 and an A cavity air / liquid outlet 103, and the lower part of the shell 1 is sequentially and spacedly provided with an air / liquid inlet two 104, a B cavity driving port 105 and a B cavity air / liquid outlet 106, wherein the A cavity driving port 102 and the B cavity driving port 105 are respectively connected with the A cavity driving port 102 and the B cavity driving port 105 of a diaphragm metering pump 3 through pipelines; the rotating shaft 2 is respectively provided with an opening one 201 and an opening two 202 at positions corresponding to the air / liquid inlet one 101 and the A cavity driving port 102 of the shell 1, and the opening one 201 and the opening two 202 are communicated through a channel one 203; the rotating shaft 2 is respectively provided with an opening three 204 and an opening four 205 at positions corresponding to the B cavity driving port 105 and the B cavity air / liquid outlet 106 of the shell 1, and the opening three 204 and the opening four 205 are communicated through a channel two 206.

[0024] Working principle:

[0025] When the rotary multi-position reversing valve for diaphragm metering pump 3 drives the diaphragm metering pump 3, the controller 7 drives the servo motor 6 to rotate, and drives the rotating shaft 2 to rotate in the shell 1, when the opening one 201 and the opening two 202 rotate to the air / liquid inlet one 101 and the A cavity driving port 102, the air / liquid inlet one 101 and the A cavity driving port 102 are communicated through the channel one 203, at the same time, the opening three 204 and the opening four 205 rotate to the B cavity driving port 105 and the B cavity air / liquid outlet 106, and the B cavity driving port 105 and the B cavity air / liquid outlet 106 are communicated through the channel two 206 (as shown in the figure). Figure 3 At this time, the driving gas / liquid enters the A cavity 301 of the diaphragm metering pump 3 through the air / liquid inlet one 101, the channel one 203 and the A cavity driving port 102 in sequence, so that the diaphragm 303 of the A cavity 301 and the B cavity 302 moves to the direction of the B cavity 302, causing the A cavity 301 to expand and the B cavity 302 to be compressed. The compressed driving gas / liquid in the B cavity 302 is sequentially discharged through the B cavity driving port 105, the channel two 206 and the B cavity air / liquid outlet 106, completing the driving of the diaphragm metering pump 3 once.

[0026] Subsequently, the controller 7 controls the rotating shaft 2 to continue rotating, and when the opening one 201 and the opening two 202 are completely misaligned with the air inlet / outlet one 101 and the A cavity driving port 102, at this time, the opening three 204 and the opening four 205 are also completely misaligned with the B cavity driving port 105 and the B cavity air outlet / outlet 106, and the diaphragm 303 of the diaphragm metering pump 3 does not move. The rotating shaft 2 continues to rotate until the opening one 201 and the opening two 202 are rotated to the air inlet / outlet two 104 and the B cavity driving port 105, and then the air inlet / outlet two 104 and the B cavity driving port 105 are connected through the channel one 203, and at the same time, the opening three 204 and the opening four 205 are rotated to the A cavity driving port 102 and the A cavity air outlet / outlet 103, and the A cavity driving port 102 and the A cavity air outlet / outlet 103 are connected through the channel two 206. At this time, the driving gas / liquid enters the B cavity 302 of the diaphragm metering pump 3 in sequence through the air inlet / outlet two 104, the channel one 203 and the B cavity driving port 105, so that the diaphragm 303 of the A cavity 301 and the B cavity 302 is moved to the direction of the A cavity 301, causing the B cavity 302 to expand and the A cavity 301 to be compressed. The driving gas / liquid compressed in the A cavity 301 is sequentially discharged through the A cavity driving port 102, the channel two 206 and the A cavity air outlet / outlet 103, and the reciprocating driving of the diaphragm metering pump 3 is completed.

[0027] Subsequently, the controller 7 controls the rotating shaft 2 to continue rotating, and when the opening one 201 and the opening two 202 are completely misaligned with the air inlet / outlet one 101 and the A cavity driving port 102, at this time, the opening three 204 and the opening four 205 are also completely misaligned with the B cavity driving port 105 and the B cavity air outlet / outlet 106, and the diaphragm 303 of the diaphragm metering pump 3 does not move. The rotating shaft 2 continues to rotate until the opening one 201 and the opening two 202 are rotated to the air inlet / outlet two 104 and the B cavity driving port 105, and then the air inlet / outlet two 104 and the B cavity driving port 105 are connected through the channel one 203, and at the same time, the opening three 204 and the opening four 205 are rotated to the A cavity driving port 102 and the A cavity air outlet / outlet 103, and the A cavity driving port 102 and the A cavity air outlet / outlet 103 are connected through the channel two 206. At this time, the driving gas / liquid enters the B cavity 302 of the diaphragm metering pump 3 in sequence through the air inlet / outlet two 104, the channel one 203 and the B cavity driving port 105, so that the diaphragm 303 of the A cavity 301 and the B cavity 302 is moved to the direction of the A cavity 301, causing the B cavity 302 to expand and the A cavity 301 to be compressed. The driving gas / liquid compressed in the A cavity 301 is sequentially discharged through the A cavity driving port 102, the channel two 206 and the A cavity air outlet / outlet 103, and the reciprocating driving of the diaphragm metering pump 3 is completed.

[0028] The diaphragm metering pump 3 of the embodiment uses a rotary multi-position reversing valve to solve the problem of low service life of the diaphragm 303 of the traditional electric double diaphragm metering pump 3 caused by driving force, and the diaphragm 303 is driven by gas / liquid, so that the diaphragm 303 is uniformly stressed and has a greatly prolonged service life. At the same time, the diaphragm metering pump 3 of the utility model uses a rotary multi-position reversing valve to break through the limitation of the diameter of the gas distribution valve of the traditional diaphragm metering pump 3, and the size of the channel diameter can be processed.

[0029] Embodiment 2

[0030] On the basis of embodiment 1, in order to further enhance the sealing property between the shell 1 and the rotating shaft 2, prevent the driving gas / liquid from leaking from the opening one 201, the opening two 202, the opening three 204 or the opening four 205, such as Figure 1As shown, the sealing sleeve 4 can be sleeved on the rotating shaft 2 at the opening one 201, the opening two 202 and the opening four 205, and the sealing sleeve 4 is provided with the opening 401 corresponding to the opening one 201, the opening two 202, the opening three 204 and the opening four 205.

Claims

1. A rotary multi-position reversing valve for a diaphragm metering pump, characterized in that The utility model provides a kind of liquid medicine injection device, including shell (1), rotationally connected with rotating shaft (2) in shell (1), rotating shaft (2) is rotated by servo motor drive;Upper portion of shell (1) is sequentially and spacedly provided with air inlet / liquid port one (101), A cavity drive port (102) and A cavity exhaust / liquid port (103), lower portion of shell (1) is sequentially and spacedly provided with air inlet / liquid port two (104), B cavity drive port (105) and B cavity exhaust / liquid port (106), wherein A cavity drive port (102) and B cavity drive port (105) are connected with the A cavity drive port (102) and B cavity drive port (105) of diaphragm metering pump (3) respectively by pipeline;Rotating shaft (2) is provided with opening one (201) and opening two (202) respectively on corresponding air inlet / liquid port one (101) and A cavity drive port (102) of shell (1), and opening one (201) and opening two (202) are communicated by passage one (203);Rotating shaft (2) is provided with opening three (204) and opening four (205) respectively on corresponding B cavity drive port (105) and B cavity exhaust / liquid port (106) of shell (1), and opening three (204) and opening four (205) are communicated by passage two (206).

2. The rotary multi-position selector valve for a diaphragm metering pump according to claim 1, characterized in that The rotating shaft (2) is provided with a sealing sleeve (4) corresponding to the opening one (201), the opening two (202) and the opening four (205).

3. The rotary multi-position selector valve for a diaphragm metering pump according to claim 1, characterized in that The rotating shaft (2) is rotatably connected in the shell (1) by a bearing (5).

4. The rotary multi-position selector valve for a diaphragm metering pump according to claim 1, characterized in that The servo motor is electrically connected with a controller (7).

5. The rotary multi-position selector valve for a diaphragm metering pump according to claim 4, characterized in that The controller (7) is provided with a display screen (701).

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