Constant current constant pressure switching valve

Abstract

The utility model discloses a kind of constant-current constant-voltage switching valves, it is characterized by including by two three-way valve bodies The six-way valve body, import passage and two mirror image settings export passage set on three-way valve body, valve rod movably installed in six-way valve body, connecting rod mechanism in the mirror image settings of valve rod two sides and the cam for driving connecting rod mechanism to act and switching flow path installed on valve rod. The utility model is switched by mirror image settings export passage and the setting of connecting rod mechanism, in the rotation process of being driven by rotating valve rod two to drive cam, the action of connecting rod mechanism is made by the pushing of cam to connecting rod mechanism, to export passage is switched, in switching process, the flow area of medium does not change, so that medium pressure does not produce fluctuation when switching, while medium pressure does not change, medium flow also does not change, to realize constant current constant voltage in switching process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a switching valve, specifically a constant-current constant-voltage switching valve. BACKGROUND

[0002] In the prior art, in the heat exchanger, filter and the like of the industrial production equipment in the petroleum, chemical industry, medicine, steel and electric power industries, two sets of devices are provided, one standby and one in use, so that when one of them needs to be repaired or needs to be repaired, switching can be carried out without affecting the operation of the whole system, therefore, a corresponding switching valve needs to be provided to switch the flow path of the medium, and in the prior art, the switching valve often causes the area of the medium channel to change when switching, which leads to fluctuations in the medium pressure during the switching process, once the medium pressure fluctuates, the flow of the medium will change, and the change in the medium pressure and the flow of the medium will lead to unstable flow of the working medium, which will affect the normal operation of the subsequent equipment. UTILITY MODEL CONTENTS

[0003] The utility model discloses a constant-current constant-voltage switching valve to solve the above problems.

[0004] In order to achieve the above purpose, the utility model provides a kind of constant-current constant-voltage switching valve, it is characterized by including six-way valve body consisting of two three-way valve bodies, import passage and two mirror image setting outlet passages set on three-way valve body, valve rod movably installed in six-way valve body, connecting rod mechanism being mirror image setting on the two sides of valve rod and cam for driving connecting rod mechanism to act and switching flow path are installed on valve rod, the connecting rod mechanism includes valve plate corresponding with outlet passage and drive plate connected with valve plate.

[0005] Further preferably, the three-way valve body is also provided with a rotating member connected with the valve rod, and a bearing for improving rotation smoothness is also installed between the rotating member and the three-way valve body.

[0006] Further preferably, it further includes spring sleeve provided on the valve plate, spring and steel ball installed in the spring sleeve, and spherical groove provided on the drive plate and matched with the steel ball so that the steel ball can protrude from the drive plate and contact the cam.

[0007] Further preferably, the drive plates on the two sides of the cam are connected by bolts.

[0008] Further preferably, it further includes guide member provided on one side of the valve plate and matched with the outlet passage for guiding and limiting the movement of the valve plate.

[0009] Further preferably, it further includes sealing structure provided on the valve plate for sealing between the valve plate and the outlet passage.

[0010] Further preferably, the sealing structure is a dovetail ring groove arranged on the valve plate and a dovetail sealing member arranged in the dovetail ring groove.

[0011] The utility model discloses beneficial effect has: through the setting of mirror image setting export channel and connecting rod mechanism, in the process of rotating valve rod two and driving cam to rotate, the connecting rod mechanism is acted through the pushing of cam to the connecting rod mechanism, thereby switching export channel, the flow area of medium does not change in the switching process, thereby the medium pressure does not produce fluctuation when switching, the medium flow also does not change while the medium pressure does not change, thereby realizing constant current and constant pressure in the switching process.

[0012] Through being connected by two three -way valve bodies and being connected in two three -way valve bodies, valve rod, thereby when switching flow path, two three -way valves are switched synchronously, and two export channels can realize one spare one use in use. BRIEF DESCRIPTION OF DRAWINGS

[0013] ATTACHED Fig. 1 It is the structure schematic diagram of the utility model;

[0014] ATTACHED Fig. 2 It is the local enlarged structure schematic diagram of the utility model;

[0015] ATTACHED Fig. 3 It is another view local section structure schematic diagram of the utility model.

[0016] Legend: 1, three -way valve body;2, six -way valve body;3, import channel;4, export channel;5, valve rod;6, cam;7, valve plate;71, driving plate;72, rotating part;73, bearing;74, spring cover;75, spring;76, steel ball;77, spherical groove;78, guide;8, dovetail ring groove;81, dovetail sealing member. DETAILED DESCRIPTION

[0017] Below, we combine the drawings and make further explanation to the constant current and constant pressure switching valve of the utility model.

[0018] It needs to be explained that, all directionality indications such as upper, lower, left, right, front, back in the embodiment of the utility model are only used for explaining the relative position relationship, movement condition etc. between various components in a certain specific posture, such as shown in the drawing, if the specific posture changes, then the directionality indication also changes accordingly.

[0019] In the utility model, unless another definite provision and limitation, the terms "connect", "fix" and the like should be understood broadly;For example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be the communication of two elements or the interaction of two elements, unless another definite limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0020] Referring to Figs. 1-3 The utility model discloses a constant current constant voltage switching valve, its characterized in that including by two three -way valve body 1 the six -way valve body 2 of being formed, set up on three -way valve body 1 import passage 3 and two mirror image setting export passage 4, the valve rod 5 of movable mounting in six -way valve body 2, the connecting rod mechanism of mirror image setting on the two sides of valve rod 5 and install on the cam 6 for driving connecting rod mechanism to drive connecting rod mechanism to act and switch flow path on valve rod 5, the connecting rod mechanism includes the valve plate 7 corresponding with export passage 4 and the drive plate 71 connected with valve plate 7;

[0021] Through the setting of mirror image setting export passage 4 and connecting rod mechanism, in the process of rotating valve rod 5 and driving cam 6 to rotate, the connecting rod mechanism is actuated by the pushing of cam 6 to the connecting rod mechanism, so that export passage 4 is switched, and the flow area of medium does not change during switching, so that the medium pressure does not fluctuate during switching, and the medium flow does not change while the medium pressure does not change, so that constant current and constant voltage are realized during switching.

[0022] In one embodiment, the three -way valve body 1 is also provided with a rotating part 72 connected with the valve rod 5, and a bearing 73 for improving rotation smoothness is further installed between the rotating part 72 and the three -way valve body 1. When switching the flow path, the valve rod 5 is rotated by driving the rotating part 72 to rotate, so as to switch the flow path. The bearing 73 is provided to reduce the resistance during rotation, reduce friction and improve the smoothness during rotation.

[0023] In one embodiment, a spring sleeve 74 is arranged on the valve plate 7, and a spring 75 and a steel ball 76 are arranged in the spring sleeve 74. The driving plate 71 is provided with a spherical groove 77 which is adapted to the steel ball 76 and enables the steel ball 76 to protrude from the rear of the driving plate 71 to contact the cam 6. The spring 75 is arranged to push the valve plate 7 and the driving plate 71 back by the restoring force thereof. The steel ball 76 protrudes from the rear of the driving plate 71 to contact the cam 6, so that the line contact is formed between the cam 6 and the steel ball 76. When the cam 6 forms a pushing force on the steel ball 76, the steel ball 76 applies a force to the spring 75 and the valve plate 7, the spring 75 is compressed and pushes the valve plate 7 to move. When the cam 6 does not form a pushing force on the steel ball 76 during rotation, the steel ball 76 is pushed back by the restoring force of the spring 75. When the cam 6 is not in the same straight line with the steel balls 76 on both sides, the steel balls 76 on both sides are pushed back by the restoring force of the springs 75 on both sides. The steel balls 76 on both sides form a pressing force on both sides of the cam 6, so as to form a self-locking position of the cam 6, and the cam 6 is in the original position and does not move easily.

[0024] In one embodiment, the driving plates 71 on both sides of the cam 6 are connected by bolts. When the cam 6 forms a pushing force on the valve plate 7 and the driving plate 71 on one side to push forward, the driving plate 71 drives the driving plate 71 on the other side to move.

[0025] In one embodiment, a guide 78 is arranged on one side of the valve plate 7 and is adapted to the outlet channel 4 to guide and limit the movement of the valve plate 7. The guide 78 can be a cross plate arranged in a cross shape.

[0026] In one embodiment, a sealing structure is arranged on the valve plate 7 to seal between the valve plate 7 and the outlet channel 4.

[0027] The sealing structure is a dovetail ring groove 8 arranged on the valve plate 7 and a dovetail sealing element 81 arranged in the dovetail ring groove 8. The dovetail ring groove 8 and the dovetail sealing element 81 are arranged in a dovetail design to prevent the dovetail sealing element 81 from easily coming out of the dovetail ring groove 8 and ensure the sealing performance.

[0028] The dovetail sealing element 81 can be embedded in the dovetail ring groove 8 after being molded by a mold. In this way, the dovetail sealing element 81 can be replaced when it is damaged. The dovetail sealing element 81 can also be directly injection molded in the dovetail ring groove 8.

[0029] In use, the six-way valve is used as a filter in the hydraulic system. Two filters, one for standby and one for use, are connected to the two outlet channels 4 on the same side of the six-way valve. The upper inlet channel 3 is connected to the oil inlet pipe, and the lower inlet channel 3 is connected to the oil outlet pipe. Before or during use, the valve stem 5 is rotated by driving the rotating component 72. The valve stem 5 then drives the two cams 6 to rotate synchronously. When the cams 6 rotate, they push one of the steel balls 76 to form a thrust. The steel ball 76 compresses the spring 75, and the spring 75 pushes the valve plate 7 forward. At the same time, the drive plate 71 on this side drives the drive plate 71 on the other side and the valve plate 7 to move synchronously until the valve plate 7 on this side is in contact with the inlet channel 3 and the flow path on this side is cut off. The medium enters the upper three-way valve body 1 through the upper inlet channel 3 and then enters the filter on this side through the outlet channel 4. After being filtered by the filter, it enters the lower three-way valve through the lower outlet channel 4 and then is discharged through the lower inlet channel 3.

[0030] When it is necessary to switch the flow path, simply rotate the rotating part 72 in the opposite direction. The rotating part 72 drives the valve stem 5 to rotate in the opposite direction, thereby driving the valve plate 7 and the drive plate 71 to move in the opposite direction. During the switching process, since the flow channel area does not change, the medium pressure will not fluctuate, and the medium flow rate will not change. It is always in a constant flow and constant pressure state during the switching process until the outlet channel 4 on the other side is closed, thus completing the flow path switching.

[0031] The scope of protection of this utility model is not limited to the above embodiments and their variations. Conventional modifications and substitutions made by those skilled in the art based on the content of these embodiments are all within the scope of protection of this utility model.

Claims

1. A constant current constant voltage switching valve characterized by Six-way valve body (2) composed of two three-way valve bodies (1), inlet channel (3) arranged on three-way valve body (1) and two mirror image arranged outlet channels (4), valve rod (5) movably installed in six-way valve body (2), connecting rod mechanism mirror image arranged on both sides of valve rod (5) and cam (6) installed on valve rod (5) for driving connecting rod mechanism to act and switching flow path, the connecting rod mechanism contains valve plate (7) corresponding to outlet channel (4) and driving plate (71) connected with valve plate (7).

2. A constant current constant voltage switching valve according to claim 1, characterized in that: The three-way valve body (1) is further provided with a rotating member (72) connected with the valve rod (5), and a bearing (73) for improving rotation smoothness is further installed between the rotating member (72) and the three-way valve body (1).

3. A constant current and constant pressure switching valve according to claim 1, characterized in that: It also includes spring sleeve (74) arranged on valve plate (7) and spring (75) and steel ball (76) installed in spring sleeve (74), the driving plate (71) is provided with spherical groove (77) matched with steel ball (76) and enabling steel ball (76) to protrude from driving plate (71) and contact with cam (6).

4. A constant current and constant pressure switching valve according to claim 3, characterized in that: The driving plates (71) on both sides of the cam (6) are connected by bolts.

5. A constant current and constant pressure switching valve according to claim 3, characterized in that: It also includes guide (78) arranged on one side of valve plate (7) matched with outlet channel (4) for guiding and limiting the movement of valve plate (7).

6. A constant current and constant pressure switching valve according to claim 5, characterized in that: It also includes sealing structure arranged on valve plate (7) for sealing between valve plate (7) and outlet channel (4).

7. A constant current and constant pressure switching valve according to claim 6, characterized in that: The sealing structure is dovetail ring groove (8) arranged on valve plate (7) and dovetail sealing member (81) installed in dovetail ring groove (8).

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