JPH048674B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electric valve that can be opened and closed manually.

In addition to opening and closing the valve body rotating shaft using an electric motor (hereinafter referred to as power opening and closing), when manual opening and closing is required, an electric valve that can also be opened and closed manually is used.

Conventional electric valves with manual opening/closing means are equipped with some means of switching between powered opening/closing and manual opening/closing, such as by releasing a clutch or pulling out a pin on a connecting shaft. Manual opening/closing is not possible unless the connection between the valve body and the valve body rotating shaft is released, and power opening/closing is not possible when switched to manual mode.

In the above-mentioned conventional technology, when manually opening and closing electric valves used in various factories, such as electric valves for fire extinguishing, that are required to open and close in emergencies, it is necessary to switch between powered opening and closing and manual opening and closing. However, due to its complexity, there is a problem in that even if there is an electric valve at hand, the timing may be wasted. Furthermore, if you forget to switch to power opening/closing after manual opening/closing, there is a problem in that power opening/closing becomes impossible in an emergency, which may lead to serious consequences.

The present invention has been made in view of the problems of the prior art described above, and provides an electric valve that can quickly perform both power opening and closing in an emergency and manual opening and closing without having to switch between power and manual operation. The purpose is to provide

In order to achieve the above object, the electric valve of the present invention has the following features:
In a motor-operated valve that is opened and closed by rotating a valve body rotation shaft approximately 90 degrees by an electric motor, the drive shaft of the electric motor and the valve body rotation shaft can freely rotate approximately 90 degrees, and after rotating 90 degrees, the By connecting a manual handle that engages with the drive shaft through a coupling, the rotation of the drive shaft is controlled by the valve body through an approximately 90 degree play between the drive shaft and the valve body rotation axis. The rotation angle of the drive shaft is set to about 180 degrees from the fully closed position to the fully open position, and the series circuit of the electric motor is connected in series with the first limit switch and the third limit switch. connected in series with the first electric circuit formed by
A first diode that does not conduct current to the motor side is connected in parallel to the first limit switch, and a third diode that conducts current to the motor side is connected in parallel to the third limit switch, and
Between the series circuit of the electric motor and the first electric circuit,
A second electric circuit in which a second limit switch and a fourth limit switch are connected in series is connected in series, and a second diode that conducts current to the motor side is connected in parallel to the second limit switch, and a second diode is connected in parallel to the second limit switch. A fourth diode that does not flow current to the motor side is connected in parallel, and first, second, third, and fourth cams are respectively attached to the drive shaft, and the first cam is set so that the drive shaft is in the fully open position. One day I opened the first limit switch,
The second cam opens the second limit switch when the drive shaft rotates in the closing direction and reaches the steady position, the third cam opens the third limit switch when the drive shaft is in the fully closed position, and the fourth cam opens the third limit switch when the drive shaft is in the fully closed position. The present invention is characterized in that the fourth limit switch is configured to open when the switch rotates in the opening direction and reaches a steady position.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partial cross-sectional configuration diagram of an embodiment of the electric valve of the present invention, and this electric valve is composed of an electric drive section 1, a connecting section 2, and a valve body 3. As shown in FIG. Fig. 2 is a vertical cross-sectional view of the connecting part 2, and Fig. 3 is a - A- in Fig. 2.
Referring to FIGS. 1 to 3, which are A' cross-sectional views, an electric motor 4 is disposed in the upper part of the electric drive unit 1, and the rotation of the electric motor 4 is controlled by a gearbox 5 and an end gear located in the lower part. A drive shaft 7 is provided which is decelerated by a stage reduction gear 6 and rotated by this final stage reduction gear 6. The rotation angle of this drive shaft 7 is set to approximately 180 degrees between the fully closed position and the fully open position.
The drive shaft 7 also includes a first cam 8 for stopping at the fully open position, a second cam 9 for rotating from the open position in the closing direction and stopping at the normal position, a third cam 10 for stopping at the fully closed position, and a third cam 10 for stopping at the fully closed position. A fourth cam 11 is installed to rotate in the opening direction and stop at a steady position, and these first, second, third and fourth cams 8, 9, 1
The first, second, and
Third and fourth limit switches S ₁ , S ₂ , S ₃ , S ₄
are respectively arranged to be operable.

The joint case 12, which is a coupling of the connecting part 2, is fixed to the valve body rotating shaft 13 by a fixed key 17, and the joint inner mechanism 14, which is arranged in the joint case 12 so as to be rotatable therewith, is fixed. It is fixed to the drive shaft 7 by a key 16.
The drive shaft 7 and the valve body rotating shaft 13 are not directly coupled. Manual handle 15 has joint case 12
The manual handle 15 is screwed into the threaded portion 12a of the manual handle 15.
The distal end portion 15a projects into the interior of the joint case 12. The joint inner unit 14 in the joint case 12 is generally formed with a notch 14a having a fan-shaped cross section with an opening angle of 90 degrees, and the tip 15a is movably fitted into the notch 14a. The valve body rotating shaft 13 is set to open and close by rotating approximately 90 degrees.

FIG. 4 is a wiring diagram of the electric drive unit 1, and shows terminals.
A _first electric circuit in which the first limit switch _S1 and the third limit switch _S3 are directly connected, and a series circuit of the electric motor 4 are connected in series between T1 _and the terminal T3. First and third diodes D ₁ and D ₃ are connected in parallel to the third limit switches S ₁ and S ₃ , respectively, and their polarities are determined by the terminal T ₁
When a positive voltage is applied to the terminal _T3 and a negative voltage is applied to the terminal T3, the first diode _D1 is in the reverse direction, and the third diode _D3 is in the forward direction. That is, the first diode D ₁ does not allow current to flow to the motor 4 side, and the third diode D ₃ allows current to flow to the motor 4 side.

As shown in FIGS. 1 to 4, when the drive shaft 7 rotates in the opening direction, the first
The limit switch _S1 is set to open by the first cam 8, and when the drive shaft 7 rotates in the closing direction, the third limit switch _S3 is set to open by the third cam 10 when the drive shaft 7 is in the fully closed position. It is set so that it is open.

Further, between the terminal T ₂ and the terminal T ₃ , a second electric circuit in which a fourth limit switch S ₄ and a second limit switch S ₂ are connected in series is connected in series between the series circuit of the motor 4 and the first electric circuit. By connecting them, a series circuit is formed. The fourth and second limit switches S ₄ and S ₂ have a fourth and second limit switch S 4 , S 2
Diodes D ₄ and D ₂ are connected in parallel,
When a positive voltage is applied to the terminal T ₂ and a negative voltage is applied to the terminal T ₃ , the polarity thereof is such that the fourth diode D ₄ is in the reverse direction and the second diode D ₂ is in the forward direction. That is, the second diode D ₂ allows current to flow to the motor 4 side, and the fourth diode D ₄ does not allow current to flow to the motor 4 side.

When the drive shaft 7 rotates in the opening direction, the fourth limit switch _S4 switches the fourth cam 1 at the normal position of the drive shaft 7.
When the drive shaft 7 rotates in the closing direction, the second limit switch _S2 is set to open by the second cam 9 at the normal position of the drive shaft 7. has been done.

The operation of the electric valve configured as above will be explained with reference to FIG. 5.

(1) Explanation that manual opening and closing is possible when the drive shaft 7 is in the normal position.

Now, assuming that the drive shaft 7 is in a normal position as shown in FIG. Since the fitting portion can move freely within the range of the notch 14a having a fan cross-sectional shape, the valve body rotating shaft 13 can be opened and closed (so-called manual opening and closing) without any switching operation. I can do it.

(2) Explanation about electric valve opening.

When the valve body rotating shaft 13 is in the closed state, it can be electrically opened from that state. For example, when the valve body rotating shaft 13 is in the closed position and the drive shaft 7 is in the normal position (at this time, the first and third limit switches S ₁ and S ₃ are closed, and the fourth and second limit switches S ₄ and S ₂ is open), when a positive voltage is applied to terminal T ₁ and a negative voltage is applied to terminal T ₃ , the current flows from terminal T ₁ → first limit switch S ₁ → third limit switch
The flow is as follows: limit switch S ₃ → electric motor 4 → terminal T ₃ , and the drive shaft 7 rotates in the opening direction. As the drive shaft 7 rotates in the opening direction, the tip 15a of the manual handle 15 is pushed by the joint inner unit 14, the valve body rotating shaft 13 starts rotating, and the rotational position of the drive shaft 7 reaches the fully open position, and the shaft is fully opened. When the first cam 8 for position stopping opens the first limit switch _S1 , the current is cut off (no current flows because the first diode _D1 is in the opposite direction). As a result, the electric motor 4 stops and the valve body rotating shaft 13 reaches the fully open position.

(3) Explanation of the return of the drive shaft to its normal position after electric valve opening.

After (2) above, connect negative terminal T ₂ and terminal T ₃
When we apply a positive voltage to terminal T 3, the current flows through terminal T ₃
→ Electric motor 4 → 2nd limit switch S ₂ (closed until the drive shaft 7 reaches the normal position) → 4th limit switch
Diode D ₄ (current flows because it is in the forward direction) →
Flows with terminal T ₂ . Due to the play of the connecting part 2,
With the valve body rotating shaft 13 remaining in the fully open position, the drive shaft 7 rotates in the closed direction due to the open position, and when the second cam 9 for stopping the steady position opens the second limit switch _S2 , the current is cut off. (No current flows through the second diode _D2 because it is in the opposite direction to the current). As a result, the electric motor 4 stops and the drive shaft 7 stops at a normal position.

(4) Explanation about electric valve closing.

Next, when you want to close the valve body rotating shaft 13 electrically, apply a negative voltage to the terminal T ₁ and a positive voltage to the terminal T ₃ , and the current flows from the terminal T ₃ to the electric motor 4.
→ 3rd limit switch S ₃ → 1st limit switch S ₁ → terminal T ₁ , and the drive shaft 7 rotates in the closing direction. As the drive shaft 7 rotates in the closing direction, the tip 15a of the manual handle 15 is pushed by the joint inner unit 14, the valve body rotation shaft 13 begins to rotate, and the rotation position of the drive shaft 7 reaches the fully closed position. When the third cam 10 for stopping at the fully closed position opens the third limit switch _S3 , the current is cut off. As a result, the electric motor 4 stops and the valve body rotating shaft 13 reaches the fully closed position.

(5) Explanation of the return of the drive shaft to its normal position after electric valve closing.

When a positive voltage is applied to terminal T ₂ and a negative voltage is applied to terminal T ₃ , current flows from terminal T ₂ → fourth limit switch S ₄ → second diode D ₂ → motor 4 → terminal T ₃ . Due to the play in the connecting portion 2, the drive shaft 7 is rotated while the valve body rotating shaft 13 remains in the fully closed position.
rotates from the closed position in the opening direction, and when the fourth cam 11 for stopping at the steady position opens the fourth limit switch _S4 , the current is cut off. the result,
The electric motor 4 stops and the drive shaft 7 returns to its normal position, returning to its initial state.

Since the present invention is configured as described above, it produces the effects described below.

(1) Both emergency opening/closing by electric motor and emergency opening/closing by manual operation can be performed quickly without switching operations, making it extremely useful industrially as a motorized valve for fire extinguishing and other emergency opening/closing in factories. .

(2) After the valve is opened or closed by an electric motor, by returning the drive shaft to its normal position while the valve body rotation shaft remains open or closed, the valve can be opened and closed by an electric motor or manually. By simply rotating the body rotation axis approximately 90 degrees, it can be fully opened or fully closed, making it easy to check the opening when manually opening and closing, and also allows for flow rate adjustment.

(3) The drive shaft can be positioned with high precision in the fully open position, normal position, or fully closed position using each cam and each limit switch, and it can be automatically positioned by the actions of the third and fourth cams and the third and fourth limit switches. By stopping the drive shaft at a normal position, the opening degree of the valve body rotating shaft and thus the flow rate can be set to a predetermined value.

[Brief explanation of drawings]

FIG. 1 is a partially cross-sectional configuration diagram of an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the connecting portion 2 of FIG. 1,
FIG. 3 is a cross-sectional view taken along line A-A' in FIG. 2, FIG. 4 is a wiring diagram in this embodiment, and FIG. It is a diagram. DESCRIPTION OF SYMBOLS 1...Electric drive part, 2...Connection part, 3...Valve body, 4...Electric motor, 5...Gearbox, 6...
Final stage reduction gear, 7... Drive shaft, 8... First cam,
9...Second cam, 10...Third cam, 11...Fourth cam, 12...Joint case, 12a...
Threaded portion, 13...Valve body rotation shaft, 14...Joint inner unit, 14a...Notch, 15...Manual handle, 15a...Tip, 16, 17...Fixed key, T ₁ , T ₂ , _T3 ...terminal, _D1 - _D4 ...first, second, third and fourth diodes, S1 _{- S4} ...first, second, third and fourth limit switches.

Claims (1)

[Claims] 1. In an electric valve that is opened and closed by rotating a valve body rotation shaft 13 by about 90 degrees by an electric motor 4, the drive shaft 7 of the electric motor 4 and the valve body rotation shaft 13 can freely rotate about 90 degrees, and After rotation, the drive shaft 7 and the valve body rotating shaft 13 are connected by a coupling 12 that integrally has a manual handle 15 that engages with the drive shaft 7, thereby creating an angle of about 90 degrees between the drive shaft 7 and the valve body rotation shaft 13. The rotation of the drive shaft 7 is transmitted to the valve body rotation shaft 13 through the play, and the rotation angle of the drive shaft 7 is set to approximately 180 degrees from the fully closed position to the fully open position. Series circuit with first limit switch S ₁ and third limit switch S ₃
are connected in series, and a first diode _D1 that does not flow current to the motor 4 side is connected in parallel to the first limit switch _S1 , and the third limit switch S ₃ is connected in parallel with a third diode D ₃ that allows current to flow to the motor 4 side, and a second limit switch S ₂ is connected between the series circuit of the motor 4 and the first electric path.
and a fourth limit switch S ₄ are connected in series, and a second diode D ₂ that flows current to the motor 4 side is connected in parallel to the second limit switch S ₂ . A fourth limit switch _S4 is connected in parallel with a fourth diode _D4 that does not flow current to the motor 4 side. 10 and 11 respectively, the first cam 8 opens the first limit switch _S1 when the drive shaft 7 is in the fully open position, and the second cam 9 opens the first limit switch S1 when the drive shaft 7 is in the fully open position.
When the drive shaft rotates in the closing direction and reaches the steady position, the second limit switch _S2 is opened, and the third cam 10 opens the third limit switch _S3 when the drive shaft 7 is in the fully closed position.
opens, and the fourth cam 11 operates the fourth limit switch when the drive shaft 7 rotates in the opening direction and reaches the steady position.
An electric valve characterized by being configured to open _S4 .